• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Provided is a light-scattering-type dust concentration measurement device capable of, in a central area of a flue and over a long and sustained period, continuously and accurately measuring the dust concentration of cloudy exhaust gas including large amounts of mist. The present invention comprises: a dust concentration meter body A comprising a gasification device A1 that is disposed in a flue, takes in cloudy exhaust gas 2 to be measured, and gasifies mist and a dust detection device A2 that has a light emitter for emitting light onto an area where the mist has been gasified and a scattered light detection unit for detecting scattered light resulting from the reflection of the light by the dust; a dust concentration meter support B that is disposed so as to enter from the outside to the inside of the flue 1 and supports the dust concentration meter body A such that the same is disposed inside the flue 1; and a calculation/control device C for determining the concentration of the dust within the cloudy exhaust gas 2 on the basis of the scattered light intensity detected by the scattered light detection unit.
    公开号:FI20206375A1
    申请号:FI20206375
    申请日:2019-11-22
    公开日:2020-12-29
    发明作者:Toshibumi TANAKA
    申请人:Tanaka Electric Laboratory Co Ltd；
    IPC主号:
    专利说明:

    [0001] [0001] The present invention relates to a light-scattering-type dust concentration meter, and in particular, relates to a light-scattering- type dust concentration meter for cloudy exhaust gas, capable of continuously and accurately measuring a dust concentration in cloudy exhaust gas inside a flue over a long and sustained period, in which the temperature inside a flue is equal to or lower than the dew point, causing mist (liquid droplet particles) and dust (solid particles) to adsorb to each other and coexist, and the exhaust gas to be cloudy.
    [0003] [0003]
    [0004] [0004] Therefore, various factories have strongly desired a technique to clearly show that white smoke is simply caused by mist and does not contain dust having a discharge concentration higher than a regulation value, i.e., a technique (means) to allow for always confirming that the dust discharge regulation is observed.
    [0005] [0005] A light-scattering-type dust concentration meter has been conventionally known as means for measuring a dust concentration However, the conventional light-scattering-type dust concentration o 20 meter can continuously measure the dust concentration in exhaust gas N in real time; however, it is theoretically difficult to measure an o accurate dust concentration in exhaust gas (cloudy exhaust gas having z a temperature equal to or lower than the dew point) containing mist a Lo after being treated by a desulfurization device or the like, due to 3 25 influence of a large amount of mist contained in the exhaust gas.
    [0006] [0006] In order to address the problem, the inventors of the present application have invented a light-scattering-type dust concentration meter capable of continuously and accurately measuring a dust concentration in cloudy exhaust gas directly inside a flue over a long and sustained period, in other words without using a sampling tube for extracting part of the cloudy exhaust gas inside the flue to an inspecting room outside the flue; and the inventors have already obtained patent rights of the invention by filing patent applications as disclosed in Patent Documents 1, 2 and 3.
    [0007] [0007] The light-scatterina-type dust concentration meter disclosed in Patent Document 1 is a dust concentration meter measuring a dust concentration in cloudy exhaust gas in which mist and dust adsorb to each other and coexist inside a flue, and is configured to include an evaporation device evaporating the mist in the cloudy exhaust gas inside the flue, a light irradiator irradiating a region where the mist is evaporated inside the flue with light, and a scattered light o 20 detector detecting scattered light resulting from the reflection of N the light on the dust from which the mist is removed and is configured o to determine the dust concentration in the cloudy exhaust gas based on x the scattered light intensity detected by the scattered light o detector. S 25 [0008]
    [0009] [0009] The light-scatterina-type dust concentration meter disclosed in Patent Document 3 is a dust concentration meter taking in cloudy exhaust gas to be measured inside a flue, evaporating mist by an evaporation device, detecting scattered light reflected on dust from which the mist is removed in a region where the mist is evaporated, and measuring the dust concentration in the cloudy exhaust gas directly inside the flue and the dust concentration meter is o 20 configured to include an air blow mechanism (dirt prevention function N on a side of an inlet of the evaporation device) in which air is o intermittently generated near an intake port of the cloudy exhaust gas I to be measured of the evaporation device. a o [0010] S 25 Patent Document 1: Japanese Patent No. 5453607 & Patent Document 2: Japanese Patent No. 5976885 Patent Document 3: Japanese Patent No. 6204941
    [0012] [0012] On the other hand, the light-scattering-type dust concentration meter of Patent Documents 1, 2 and 3 invented by the inventors of the present application is configured so that a through-hole is formed in o 20 the side surface of a framework of a chimney or the like forming a N flue, and the light-scattering-type dust concentration meter is fitted o and attached to the through-hole, so that the dust concentration in E cloudy exhaust gas is continuously measured on a further inner Lo peripheral surface side as compared with the continuous exhaust gas 3 25 measurement systems in the U.S., Europe, and the ISO systems. It has & been sufficiently confirmed that, even when the measurement is performed on the inner peripheral surface side of the flue as described above, the dust concentration can be accurately measured with high precision.
    [0013] [0013] However, there are cases in which a dust concentration in cloudy exhaust gas is required to be continuously measured in a central region of a flue in conformity with the U.S., Europe, and ISO systems. It has been desired that the light-scattering-type dust concentration meter of Patent Documents 1, 2 and 3 having excellent performance capable of continuously measuring a dust concentration in cloudy exhaust gas as invented by the present inventors of the present application could be applied to continuous measurement of a dust concentration in exhaust gas in a central region of a flue.
    [0014] [0014] In view of the above-described circumstances, it is an object of the present invention to provide a light-scattering-type dust concentration meter enabling continuous and accurate measurement of the dust concentration in cloudy exhaust gas containing a large amount of mist in a central region of a flue, over a long and sustained period. oO 20
    [0016] [0016]
    [0017] [0017] (2) The present invention may be configured in (1) above so that the light irradiator and the scattered light detector of the dust o 20 concentration meter body arranged inside the flue and the N arithmetic/control device arranged outside the flue are connected by o an optical fiber; an electrical signal is converted into an optical I signal by a light projection control unit of the arithmetic/control a Lo device outside a flue over, the optical signal is transmitted to the 3 25 light irradiator inside the flue by a light projecting optical fiber, N and then light is emitted to the exhaust gas from the light irradiator; and an optical signal detected by the scattered light detector inside the flue is transmitted to the outside of the flue by a light receiving optical fiber, the optical signal is converted into an electrical signal by a light reception control unit outside the flue, and then the dust concentration is determined by the arithmetic/control device.
    [0018] [0018] (3) In the present invention, the dust concentration meter support may include: a support bar inserted and arranged from the outside to the inside of the flue by connecting the dust concentration meter body to a tip end arranged inside the flue and connecting at least one part of the arithmetic/control device to a rear end arranged outside the flue; a reinforcing rib projecting from the outer peripheral surface of the support bar to the outside in the radial direction around the axis of the support bar and extending along the direction of the axis of the support bar; and a support bar holding member fitted to an attachment hole formed through the flue to support the support bar in (1) or (2) above.
    [0019] [0019] (4) In the present invention, the evaporation device may include: o 20 a metal inner tube; a sheath heater provided to be wound around the N outer periphery of the inner tube; and a first vessel forming the o outer frame of the evaporation device, in which the dust detecting I device may include a second vessel housing the light irradiator and a O the scattered light detector and forming the outer frame of the dust 3 25 detecting device, and the first vessel and the second vessel may be N formed using a resin member in any one of (1) to (3) above.
    [0020] [0020]
    [0021] [0021] (6) In the present invention, the first vessel may be formed into a rectangular box shape by assembling a plurality of members in any one of (1) to (5) above. In the present invention, the "rectangular box shape” includes a “substantially rectangular box shape”. Effects of the Invention
    [0022] [0022] The present invention enables continuous and accurate measurement of a dust concentration in cloudy exhaust gas containing a large amount of mist in a central region of a flue, over a long and sustained period, in conformity with the continuous exhaust gas measurement systems of the U.S., Europe, and ISO systems.
    [0023] [0023] o 20 Therefore, the light-scattering-type dust concentration meter of N the present invention can achieve a light-scattering-type dust o concentration meter for cloudy exhaust gas with higher reliability, I versatility, and applicability. a
    [0024] [0024] FIG. 1 is a view illustrating a light-scattering-type dust concentration meter according to one embodiment of the present invention and is a view illustrating a state where the light- scattering-type dust concentration meter is attached to a flue; FIG. 2 is a view schematically illustrating the principle of measuring a dust concentration in cloudy exhaust gas by the light- scattering-type dust concentration meter according to one embodiment of the present invention; FIG. 3 is a block diagram illustrating the light-scattering-type dust concentration meter according to one embodiment of the present invention; FIG. 4 is a cross-sectional view illustrating a dust concentration meter body of the light-scattering-type dust concentration meter according to one embodiment of the present invention; FIG. 5 is an X1-X1 arrow view of FIG. 4; o 20 FIG. 6 is an X2-X2 arrow view of FIG. 4; N FIG. 7 is an X3-X3 arrow view of FIG. 4; and o FIG. 8 is an X1-X1 arrow view of FIG. 1.
    [0026] [0026] As illustrated in FIGS. 1 and 2, a light-scattering-type dust concentration meter (light-scattering-type dust concentration meter for cloudy exhaust gas) 100 of the present embodiment is configured so that an evaporation device Al is arranged on the upstream side in a flow direction T of cloudy exhaust gas 2 inside a flue 1, mist 3 is evaporated by the evaporation device Al, a dust detection device 22 on the downstream of the evaporation device Al emits measurement light 4 o 20 and detects scattered light 6 reflected on dust 5, and then the dust N concentration is measured based on the scattered light intensity. a [0027]
    [0028] [0028]
    [0029] [0029] As illustrated in FIGS. 4 to 7 (and FIGS. 2 and 3), the evaporation device Al is formed into a cylindrical shape and includes an inner tube (heater pipe) 11 disposed such that an axis 01 direction is aligned with the flow direction T of the cloudy exhaust gas 2, a sheath heater 12 provided to be wound around the outer periphery of the inner tube 11, a heat transfer material 13 covering the outer peripheral surface of the inner tube 11 to bury the sheath heater 12, a heat insulating material 14 disposed to enclose the inner tube 11, the sheath heater 12, and the heat transfer material 13, and a first vessel 15 forming the outer frame of the evaporation device Al and o 20 housing the inner tube 11, the sheath heater 12, the heat transfer N material 13, and the heat insulating material 14.
    [0031] [0031] As the sheath heater 12, the sheath heater 12 of 220 V/600 W is wound around the inner tube 11 for use, for example.
    [0032] [0032] The heat transfer material 13 is heat transfer cement, for example. By covering the outer peripheral surface of the inner tube 11 with the heat transfer material 13 and burying the sheath heater 12 with the heat transfer material 13, heat emitted by the sheath heater 12 is effectively transferred in the axis 01 direction of the inner tube 11, so that the entire inner tube 11 can be effectively heated to a predetermined temperature.
    [0034] [0034] The first vessel 15 forming the outer frame of the evaporation device Al is formed including an inlet side partition plate portion 21 disposed on one end side of the inner tube 11 such that the plate surface is orthogonal to the axis 01 of the inner tube 11 while causing an inlet (inlet opening) 20 on the one end side of the inner tube 11 to communicate with the outside, an outlet side partition plate portion 23 disposed on the other end side of the inner tube 11 such that the plate surface is orthogonal to the axis Ol of the inner tube 11 while causing an outlet (outlet opening) 22 on the other end side of the inner tube 11 to communicate with the outside, a cover portion 24 disposed on the outer peripheral surfaces of the inlet side partition plate portion 21 and the outlet side partition plate portion 23 to join both end portion sides and surround the inner tube 11, the sheath heater 12, the heat transfer material 13, and the heat insulating material 14, and a disc-shaped base portion 25 disposed to be joined to the outer peripheral surfaces of the inlet side partition plate portion 21 and the outlet side partition plate portion 23 to house the inner tube 11, the sheath heater 12, the heat transfer o 20 material 13, and the heat insulating material 14 together with the N cover portion 24 and used for the fixation of the light-scattering- o type dust concentration meter 100 to a framework forming the flue 1 or E the like, and the insertion and connection of wiring lines and piping O lines of the sheath heater 12, the various air blow mechanisms 8, 9, 3 25 10, and the like.
    [0036] [0036] In the present embodiment, a sealing agent such as a silicone sealing agent is applied to the joint portions of the inlet side partition plate portion 21, the outlet side partition plate portion 23, the cover portion 24, and the base portion 25.
    [0037] [0037] As illustrated in FIGS. 4 and 7, the inlet side partition plate portion 21 is formed as an inclined surface (tapered surface) 2la which is gradually directed from the front surface in which the opening 20 is opened to the inner surface on the rear side in the axis 01 direction as a through-hole portion forming the inlet opening 20 on the one end side of the inner tube 11 is directed from the outside in the radial direction around the axis Ol of the inner tube 11 toward the axis 01 side of the inner tube 11.
    [0039] [0039] Further, by forming the inlet side partition plate portion 21, the outlet side partition plate portion 23, the cover portion 24, and the base portion 25 using resin materials, members can be easily replaced when damage occurs due to an impact or the like, so that the light-scattering-type dust concentration meter 100 excellent in maintenance properties can be achieved.
    [0040] [0040] Further, the first vessel 15 preferably uses fluororesin such as PTFE (polytetrafluoroethylene (tetrafluoroethylene resin)), PFA (perfluoroalkoxy fluororesin), and PVDF (polyvinylidene fluoride), and more preferably uses a resin material in which carbon is mixed into the fluororesin.
    [0042] [0042]
    [0043] [0043] The evaporation device Al includes the inner tube 11, the sheath heater 12, the heat transfer material 13, the heat insulating material 14, and the first vessel 15 described above, and thus can heat the inner tube 11 to a high temperature of 500°C or more, for example. As illustrated in FIGS. 2 and 4, a thermocouple 27 as a temperature measurement means is disposed inside the first vessel 15 in order to measure and control the temperature of the sheath heater 12 and the like.
    [0044] [0044] As illustrated in FIGS. 4, 5 and 7 (and FIGS. 2 and 3), the dust detection device 22 is configured including a light irradiator 30 provided adjacent to the downstream side in the flow direction T of o 20 the exhaust gas 2 of an outlet opening 22 (outlet side partition plate N portion 23) on the other end side of the inner tube 11 of the o evaporation device Al and irradiating the exhaust gas 2 in which the x mist 3 is evaporated by the evaporation device Al and which comes out Lo from the outlet opening 22 with the light 4, a scattered light 3 25 detector 31 detecting the scattered light 6 reflected by the dust 5 & contained in the exhaust gas 2, and a second vessel 32 forming the outer frame of the dust detection device A2 and housing the light irradiator 30 and the scattered light detector 31.
    [0045] [0045] The second vessel 32 forming the outer frame of the dust detection device A2 1s formed into a rectangular box shape (including a substantially rectangular box shape) enclosing the light irradiator 30 and the scattered light detector 31 while sharing the base portion 25 of the first vessel 15. Further, a circular through-hole 32a is formed in the upper surface facing the exhaust gas 2 side immediately after coming out of the outlet opening 22 of the evaporation device Al and a holding block 32b holding the light irradiator 30 and the scattered light detector 31 is fitted and provided in the through-hole 32a.
    [0046] [0046] Further, the holding block 32b is provided with light transmitting members (light transmitting surfaces: light projection surface and light receiving surface) 32c projecting the light 4 emitted from the light irradiator 30 inside the second vessel 32 to the exhaust gas 2 and causing the scattered light detector 31 inside the second vessel 32 to receive the scattered light 6 reflected by the o 20 dust 5. N In the present embodiment, the sealed state inside the second vessel o 32 is secured by using sealing materials or packing materials such as E the holding block 32b and an O-ring 32d. 2 [0047] S 25 The second vessel 32 of the present embodiment is formed using N resin materials as with the first vessel 15. As a result, the weight of the light-scattering-type dust concentration meter 100 can be reduced, and a vessel having excellent corrosion resistance and durability and being unsusceptible to occurrence of corrosion, damage, and the like can be formed, even when exposed to the cloudy exhaust gas 2 for a long period, or even when corrosive substances such as hydrochloric acid are contained in the cloudy exhaust gas 2. Further, by using resin materials, members can be easily replaced when damage occurs due to an impact or the like, so that the light- scattering-type dust concentration meter 100 excellent in maintenance properties can be achieved.
    [0048] [0048] Further, the second vessel 32 preferably uses fluororesin such as PTFE (polytetrafluoroethylene (tetrafluoroethylene resin)), PFA (perfluoroalkoxy fluororesin), and PVDF (polyvinylidene fluoride), as with the first vessel 15. Further, a composite resin material in which carbon is mixed into the fluororesin is more preferably used. By using such fluororesin or carbon-mixed fluororesin, a vessel excellent in corrosion resistance and durability can be more o 20 effectively formed.
    [0051] [0051] The scattered light detector 31 detects the scattered light 6 scattered by the reflection of the measurement light 4 on the dust 5 from which the mist 3 is removed after passing through the evaporation device Al.
    [0052] [0052] Although a cloudy exhaust gas region S3 not passing through the evaporation device Al is adjacent to the scattered light detection region S2 (region S1), the surrounding cloudy exhaust gas 2 is blocked with an air curtain 33, and thus is not mixed with the exhaust gas 2 o 20 evaporated by the evaporation device Al and further the measurement N light 4 synchronously detected at a fixed wavelength is emitted to the o exhaust gas 2, whereby the scattered light 6 scattered by the dust 5 I in the scattered light detection region S2 and the scattered light 6 a Lo scattered by the dust 5 to which the mist 3 adsorbs in the cloudy 3 25 exhaust gas 2 not passing through the evaporation device Al are N scattered light 6 having different wavelengths, and the scattered light 6 can be identified by the scattered light detector 31.
    [0053] [0053] Further, even when the scattered light 6 having the same wavelength as that of the scattered light 6 generated from the scattered light detection region S2 is generated from the adjacent or mixed cloudy exhaust gas 2 not passing through the evaporation device Al, the amount is extremely small and further the light intensity of the scattered light detection region S2 is extremely high, and therefore the light quantity of the scattered light 6 from the cloudy exhaust gas 2 is negligible.
    [0054] [0054] Further, the inventors of the present application found that, by setting a crossing angle 6 between an optical axis of the light irradiator 30 and the optical axis of the scattered light detector 31 to 45° to 90° or preferably 60°, the dust 5 in the exhaust gas 2 evaporated by the evaporation device Al can be securely and suitably detected by the dust detection device 22.
    [0055] [0055] The light-scattering-type dust concentration meter 100 includes a first air blow mechanism 8 blowing intermittent air to the inlet 20 o 20 side of the cloudy exhaust gas 2, as illustrated in FIGS. 3, 4 and 6.
    [0057] [0057] The first air blow mechanism 8 blows air from the plurality of air discharge ports 8b when the intermittent air is supplied to the first flow passage 8a.
    [0058] [0058] The light-scattering-type dust concentration meter 100 includes o 20 the second air blow mechanism 9 for forming the air curtain 33 N separating and isolating the region (air current) S1 where the state o in which the mist 3 is evaporated after passing through the I evaporation device Al is maintained from the region S3 of the cloudy a Lo exhaust gas not passing through the evaporation device Al, as 3 25 illustrated in FIGS. 3, 4 and 7.
    [0060] [0060] This enables the second air blow mechanism 9 to blow air toward the downstream side in the flow direction T of the cloudy exhaust gas 2 to form the air curtain 33 for separating and isolating the region S1 where the state in which the mist 3 is evaporated after passing through the evaporation device Al is maintained from the region S3 of the cloudy exhaust gas 2 not passing through the evaporation device Al to prevent the mixing of the mist 3 into the scattered light detection region S1 (S2), thereby detecting the scattered light 6 without being affected by the mist 3. More specifically, the air curtain 33 as such can form an isolated space (S1) above the second vessel 32.
    [0061] [0061] o 20 The air discharge port 9b is disposed along the outer peripheral end of the first vessel 15 in a portion up to the upper surface of the a second vessel 32.
    [0063] [0063] The third air blow mechanism 10 includes: a second flow passage 9a (10a), which is provided in the outlet side partition plate portion 23 of the first vessel 15 and which always or intermittently allows the air to pass through; and air discharge ports 10b opened to the downstream side in the flow direction T of the outlet side partition plate portion 23, bored along the width direction between the outlet opening 22 and the upper surface of the second vessel 32 below the outlet opening 22 of the outlet side partition plate portion 23, and communicating with the second flow passage 9a (10a).
    [0064] [0064] This enables the third air blow mechanism 10 to blow air toward o 20 the downstream side in the flow direction T of the exhaust gas 2 and N toward the light transmitting surfaces 32c (above the light o transmitting surfaces) of the second vessel 32 to blow away the mist 3 x and the like inside the air curtain 33 to prevent (suppress) drain Lo accumulation due to condensation the mist 3 on the light transmitting 3 25 surfaces 32c of the second vessel 32 and attachment, accumulation, or N the like of the dust 5 to the drain.
    [0065] [0065]
    [0066] [0066] The air blow by the first air blow mechanism 8 affects a dust detection value, and therefore it is preferable that a CPU records a detection value of the dust immediately before the air blow on a recording device linked with timing of the air blow, and then displays the detection value on a display portion as the measured concentration during the air blow, thereby eliminating influence on consecutive instructions. o 20 [0067] N When there is a risk that the air blow by the third air blow o mechanism 10 affects a dust detection value as with the first air blow E mechanism 8, the flow passage 10a of the third air blow mechanism 10 Lo may be independently provided or communicate with the first flow 3 25 passage 8a of the first air blow mechanism 8, or a piping line linked N to the first flow passage 8a of the first air blow mechanism 8 may be connected to the flow passage 10a of the third air blow mechanism 10,
    [0068] [0068] As illustrated in FIGS. 1, 2 and 3, the arithmetic/control device C includes: an arithmetic device 36 calculating the dust concentration from the light intensity of the scattered light 6 based on the fact that the scattered light 6 has a proportional relationship with the dust concentration; and a temperature regulation control device 37 performing temperature regulation or the like of the sheath heater 12. For example, when a calibration curve of the proportional relationship between the dust concentration and the light quantity is prepared in advance, the dust concentration to the light auantity of the detected scattered light 6 can be determined from the calibration curve.
    [0069] [0069] Further, the arithmetic/control device C includes a signal conversion control device 42 that includes a light projection control unit 39 and a light reception control unit 41, in which the light projection control unit 39 is connected to the light irradiator 30 by o 20 a light projecting optical fiber 38, receives an electrical signal and N causes the light irradiator 30 to emit light (optical signal) o according to the electrical signal through the light projecting x optical fiber 38, and the light reception control unit 41 is connected Lo to the scattered light detector 31 by a light receiving optical fiber 3 25 40, receives light (optical signal) received by the scattered light N detector 31 through the light receiving optical fiber 40 and transmits an electrical signal according to the optical signal to the arithmetic device 36.
    [0070] [0070] More specifically, in the light-scattering-type dust concentration meter 100 of the present embodiment, the dust detection device A2 and the arithmetic/control device C are connected by the optical fibers 38 and 40. As illustrated in FIGS. 1 and 3, the light-scattering-type dust concentration meter 100 of the present embodiment is configured so that the dust concentration meter body A including the evaporation device Al and the dust detection device 22 is arranged in a central region la inside the flue 1, the arithmetic/control device C is arranged outside the flue 1, an electrical signal is converted into an optical signal by the light projection control unit 39 outside the flue 1, the optical signal is transmitted to the light irradiator 30 inside the flue 1 by the optical fiber 38, and then light is emitted to the exhaust gas 2 from the light irradiator 30, to be described in detail later. Further, the light-scattering-type dust concentration meter 100 of the present embodiment is configured so that an optical signal detected by o 20 the dust detection device A2 inside the flue 1 is transmitted to the N outside of the flue 1 by the optical fiber 40 and is converted into an o electrical signal by the light reception control unit 41 outside the x flue 1, and the arithmetic device 36 determines a dust concentration O by the electrical signal.
    [0072] [0072] Meanwhile, as illustrated in FIGS. 1, 4 and 6 to 8, the dust concentration meter support B is for arranging and supporting the dust concentration meter body A including the evaporation device Al and the dust detection device A2 in the central region la inside the flue 1, and the dust concentration meter support B includes a metal support bar Bl having corrosion resistance and predetermined proof stress and a support bar holding member B2 fitted to an attachment hole 26a formed in a framework 26 forming the flue 1 or the like to seal a portion of the attachment hole 26a and indirectly or directly supporting the support bar Bl inserted and arranged in the attachment hole 26a in a state where an axis 03 direction of the support bar BI is directed in the radial direction orthogonal to the axial center (axis) 02 of the flue 1.
    [0073] [0073] o 20 The support bar Bl of the present embodiment is a tube material N such as SUS304, for example, inserted and arranged in the attachment o hole 26a formed in the framework 26 forming the flue 1 or the like by x connecting the rear end in the axis 03 direction to the relay box C2 Lo of the arithmetic/control device C and connecting the tip end to the 3 25 dust concentration meter body A (base portion 25), and arranges the N dust concentration meter body A in the central region la of the flue
    [0074] [0074] A reinforcing rib B3 projecting to the outside in the radial direction around the axis 03 from the outer peripheral surface and extending from the rear end to the tip end in the axis 03 direction is provided to the support bar Bl.
    [0075] [0075] The reinforcing rib B3 is a plate material such as SUS304, for example. One reinforcing rib B3 is provided integrally with the support bar Bl by being welded thereto, for example.
    [0076] [0076] Further, the reinforcing rib B3 of the present embodiment is formed to have a substantially triangular shape such that the projection amount gradually decreases from the rear end to the tip end in the axis 03 direction of the support bar Bl.
    [0078] [0078] The support bar holding member B2 is disposed such that the tip end side in the axis 04 direction is fitted to the attachment hole 26a, the support bar Bl (and reinforcing rib B3) is inserted through the inside of the attachment hole 26a such that the axes 03 and 04 are coaxially arranged, and the flange 29 on the rear end is bolted to the relay box C2 of the arithmetic/control device C together with the rear end of the support bar Bl. In a portion where the tip end side of the support bar holding member B2 is fitted to the attachment hole 26a, the flue 1 is sealed by performing sealing treatment or the like.
    [0079] [0079] In the light-scattering-type dust concentration meter 100 of the present embodiment having the configuration described above, the dust concentration meter body A is arranged in the central region la (for o 20 example, region with a diameter of 30 cm around the axis 02 of the N flue 1) of the flue 1 such that the axis 01 direction of the inner o tube 11 of the evaporation device Al is directed in the flow direction I T of the cloudy exhaust gas 2, and the inlet opening 20 is directed to a Lo the upstream side in the flow direction T of the cloudy exhaust gas 2 3 25 and the outlet opening 22 is directed to the downstream side while & being supported by the dust concentration meter support B, as illustrated in FIGS. 1 and 8.
    [0080] [0080] Thus, the light-scattering-type dust concentration meter 100 of the present embodiment can measure the dust concentration by taking in the cloudy exhaust gas 2 into the inner tube 11 of the evaporation device Al and evaporating the mist 3 in the cloudy exhaust gas 2 in the central region la inside the flue 1, irradiating the exhaust gas 2 in which the mist 3 is evaporated with the measurement light 4 by the light irradiator 30 of the dust detection device 22, and then detecting the scattered light 6 reflected on the dust 5 by the scattered light detector 31.
    [0081] [0081] Further, the dust concentration in the cloudy exhaust gas 2 can be continuously and accurately measured over a long and sustained period in the central region la inside the flue 1.
    [0082] [0082] Therefore, the light-scattering-type dust concentration meter 100 o 20 of the present embodiment can continuously and accurately measure a N dust concentration in the cloudy exhaust gas 2 containing a large o amount of mist in the central region la of the flue 1, over a long and x sustained period, in conformity with the continuous exhaust gas O measurement systems of the U.S., Europe, and ISO systems, and thus the 3 25 light-scattering-type dust concentration meter 100 for the cloudy N exhaust gas 2 having higher reliability, versatility, and applicability can be achieved.
    [0083] [0083] Further, the light-scattering-type dust concentration meter 100 of the present embodiment can achieve reduction in weight of the light-scattering-type dust concentration meter 100 because the first vessel 15 of the evaporation device Al and the second vessel 32 of the dust detection device 22 are formed using resin members. Thus, even in a case of a configuration in which the dust concentration meter body A is supported by being attached to the tip end of the dust concentration meter support B, the handling properties thereof can be improved.
    [0084] [0084] Since the first vessel 15 of the evaporation device Al and the second vessel 32 of the dust detection device A2 are formed using resin members, a vessel or the light-scattering-type dust concentration meter 100 having excellent corrosion resistance and durability and being unsusceptible to occurrence of corrosion, damage, and the like can be formed and configured, even when exposed to the cloudy exhaust gas 2 over a long period, or even when corrosive substances such as hydrochloric acid are contained in the cloudy o 20 exhaust gas 2.
    [0086] [0086] Further, by forming the resin members of the first vessel 15 and the second vessel 32 using fluororesin such as PTFE (polytetrafluoroethylene (tetrafluoroethylene resin)), PFA (perfluoroalkoxy fluororesin), and PVDF (polyvinylidene fluoride), or using a resin material in which carbon is mixed into the fluororesin, the vessel (light-scattering-type dust concentration meter 100) excellent in corrosion resistance and durability can be more effectively formed.
    [0087] [0087] Further, by forming the first vessel 15 and the second vessel 32 into a rectangular box shape by assembling a plurality of members, o 20 each member can be easily attached, processed, replaced, and the like N and the sealability can be easily secured. a [0088]
    [0089] [0089] For example, the present embodiment has been described, in which the dust concentration meter body A including the evaporation device Al and the dust detection device A2 is arranged in the central region la of the flue 1 by the dust concentration meter support B. However, the arrangement of the dust concentration meter body A may not be necessarily limited to the central region la of the flue 1, and the dust concentration meter body A may be arranged at a desired position inside the flue 1 by adjusting the length of the dust concentration meter support B, and may be used to measure the dust concentration in the cloudy exhaust gas 2 of the desired position inside this flue 1.INDUSTRIAL APPLICABILITY
    [0090] [0090] The light-scattering-type dust concentration meter for cloudy exhaust gas of the present invention can be easily attached to existing flues at low cost.
    [0091] [0091] 1 flue la central region 2 cloudy exhaust gas 3 mist 4 measurement light (light) 5 dust 6 scattered light o 20 7 arithmetic control device N 8 first air blow mechanism o 9 second air blow mechanism (air blow mechanism for air curtain) z 10 third air blow mechanism (air blow mechanism for light a Lo transmitting surface) 3 25 10b air discharge port
    O N 11 inner tube 12 sheath heater
    13 heat transfer material 14 heat insulating material 15 first vessel 20 inlet (inlet opening) 21 inlet side partition plate portion 22 outlet (outlet opening) 23 outlet side partition plate portion 24 cover portion 25 base portion 26 framework forming flue 26a attachment hole 27 thermocouple 30 light irradiator 31 scattered light detector 32 second vessel 32c light transmitting member (light transmitting surface: light projection surface and light receiving surface) 33 air curtain 36 arithmetic device o 20 38 light projecting optical fiber N 39 light projection control unit o 40 light receiving optical fiber Ek 41 light reception control unit a O 100 light-scattering-type dust concentration meter for cloudy
    O S 25 exhaust gas
    O N A dust concentration meter body Al evaporation device
    A2 dust detection device B dust concentration meter support Bl support bar B2 support bar holding member B3 reinforcing rib C arithmetic/control device Cl control box C2 relay box D instrument panel room 01 axis of inner tube 02 axial center of flue 03 axis of support bar 04 axis of support bar holding member S1 region where a state in which mist is evaporated after passing through the evaporation device is maintained (region where mist is evaporated) S2 scattered light detection region S3 region of cloudy exhaust gas not passing through the evaporation device o 20 T flow direction of cloudy exhaust gasONNON
    I a aLO
    MN 0)OONON
    权利要求:
    Claims (13)
    [1] 1. A light-scattering-type dust concentration meter for cloudy exhaust gas for detecting, in cloudy exhaust gas in which mist and dust adsorb to each other and coexist inside a flue, the dust directly inside the flue and measuring a dust concentration, the light-scattering-type dust concentration meter for cloudy exhaust gas comprising: a dust concentration meter body including an evaporation device disposed inside the flue and taking in the cloudy exhaust gas to be measured and evaporating the mist, and a dust detecting device having a light irradiator irradiating a region where the mist is evaporated with light and a scattered light detector detecting scattered light resulting from reflection of the light on the dust; a dust concentration meter support inserted and arranged from an outside to an inside of the flue and arranging the dust concentration meter body inside the flue while supporting the dust concentration meter body; and an arithmetic/control device determining the dust concentration in the cloudy exhaust gas based on scattered light intensity detected by the o 20 scattered light detector. &
    N o
    [2] 2. The light-scattering-type dust concentration meter for cloudy E exhaust gas according to claim 1, wherein Lo the light irradiator and the scattered light detector of the dust 3 25 concentration meter body arranged inside the flue and the N arithmetic/control device arranged outside the flue are connected by an optical fiber,
    an electrical signal is converted into an optical signal by a light projection control unit of the arithmetic/control device outside the flue, the optical signal is transmitted to the light irradiator inside the flue by a light projecting optical fiber, and then the light irradiator irradiates the exhaust gas with light, and an optical signal detected by the scattered light detector inside the flue is transmitted to the outside of the flue by a light receiving optical fiber, the optical signal is converted into an electrical signal by a light reception control unit outside the flue, and then the dust concentration is determined by the arithmetic/control device.
    [3] 3. The light-scattering-type dust concentration meter for cloudy exhaust gas according to claim 1 or 2, wherein the dust concentration meter support includes: a support bar inserted and arranged from an outside to an inside of the flue by connecting the dust concentration meter body to a tip end arranged inside the flue and connecting at least one part of the arithmetic/control device to a rear end arranged outside the flue; a reinforcing rib projecting from an outer peripheral surface of the o 20 support bar to an outside in a radial direction around an axis of the N support bar and extending along a direction of the axis of the support o bar; and E a support bar holding member fitted to an attachment hole formed O through the flue to support the support bar. e 25
    [4] O N 4. The light-scattering-type dust concentration meter for cloudy exhaust gas according to any one of claims 1 to 3, wherein the evaporation device includes: a metal inner tube; a sheath heater provided to be wound around an outer periphery of the inner tube; and a first vessel forming an outer frame of the evaporation device, wherein the dust detecting device includes a second vessel housing the light irradiator and the scattered light detector and forming an outer frame of the dust detecting device, and the first vessel and the second vessel are formed using a resin member.
    [5] 5. The light-scattering-type dust concentration meter for cloudy exhaust gas according to claim 4, wherein the resin member forming the first vessel and the second vessel is formed using fluororesin, such as PTFE, PFA, or PVDF, or a composite resin in which silicon carbide is mixed with the fluororesin.
    [6] 6. The light-scattering-type dust concentration meter for cloudy o 20 exhaust gas according to any one of claims 1 to 5, wherein the first vessel is formed into a rectangular box shape by assembling a a plurality of members. a O
    [7] 7. A light-scattering-type dust concentration meter for cloudy exhaust 3 25 gas for detecting, in cloudy exhaust gas in which mist and dust adsorb & to each other and coexist inside a flue, the dust directly inside the flue and measuring a dust concentration, the light-scattering-type dust concentration meter for cloudy exhaust gas comprising: an evaporation device disposed inside the flue and taking in the cloudy exhaust gas to be measured and evaporating the mist; a dust detecting device having a light irradiator irradiating a region where the mist is evaporated with light and a scattered light detector detecting scattered light resulting from reflection of the light on the dust; and an air blow mechanism for light projection surface and for light receiving surface, the air blow mechanism blowing air from an outlet side of the exhaust gas in which the mist is evaporated by the evaporation device, toward a side of a light projection surface projecting the light emitted by the light irradiator to a region where the mist is evaporated, and toward a side of a light receiving surface causing the scattered light detector to receive the scattered light reflected on the dust.
    [8] 8. The light-scattering-type dust concentration meter for cloudy exhaust gas according to claim 7, comprising: an air blow mechanism for air curtain forming an air curtain separating a region where a state in which the mist is evaporated after passing through the evaporation device is maintained from the cloudy exhaust gas not passing through the evaporation device, from the outlet side of the S exhaust gas of the evaporation device toward a downstream in a flow
    O N direction of the exhaust gas, wherein
    N " 25 the air blow mechanism for light projection surface and for light
    O
    N x receiving surface is configured to jami a LO include an air discharge port blowing air to the region where the
    N 0) S state in which the mist is evaporated after passing through the
    N
    O N evaporation device is maintained in the air curtain, and blow the air from the air discharge port toward the light projection surface and the light receiving surface provided in the region where the state in which the mist is evaporated after passing through the evaporation device is maintained in the air curtain, on a downstream side in the flow direction of the exhaust gas.
    [9] 9. The light-scattering-type dust concentration meter for cloudy exhaust gas according to claim 7 or 8, wherein the air discharge port is provided in a vertical direction between the outlet of the exhaust gas and the light projection surface and the light receiving surface, in a front view from the side in the flow direction of the exhaust gas.
    [10] 10. A light-scattering-type dust concentration meter for cloudy exhaust gas detecting, in cloudy exhaust gas in which mist and dust adsorb to each other and coexist inside a flue, the dust directly inside the flue and measuring a dust concentration, the light- scattering-type dust concentration meter for cloudy exhaust gas comprising: an evaporation device disposed inside the flue and taking in the cloudy exhaust gas to be measured and evaporating the mist; and S 20 a dust detecting device having a light irradiator irradiating a region
    O N where the mist is evaporated with light and a scattered light detector o detecting scattered light resulting from reflection of the light on E the dust, © the evaporation device including: ä 25 a metal inner tube; a sheath heater provided to be wound around an outer periphery of the inner tube; a first vessel forming an outer frame of the evaporation device, as well as a heat transfer material covering an outer peripheral surface of the inner tube to bury the sheath heater; and a heat insulating material disposed to enclose the inner tube, the sheath heater, and the heat transfer material.
    [11] 11. The light-scattering-type dust concentration meter for cloudy exhaust gas according to claim 10, wherein the dust detecting device includes a second vessel housing the light irradiator and the scattered light detector and forming an outer frame of the dust detecting device, and the first vessel and the second vessel are formed using a resin member.
    [12] 12. The light-scattering-type dust concentration meter for cloudy exhaust gas according to claim 11, wherein the resin member forming the first vessel and the second vessel is formed using fluororesin, such as PTFE, PFA, or PVDF, or a composite resin in which silicon carbide is mixed with the fluororesin. oO
    N
    O
    N N
    [13] 13. The light-scattering-type dust concentration meter for cloudy
    O N exhaust gas according to any one of claims 10 to 12, wherein the first
    I jami - vessel is formed into a rectangular box shape by assembling a
    LO 2 25 plurality of members.
    O
    N
    O
    N
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    同族专利:
    公开号 | 公开日
    JP2020085664A|2020-06-04|
    WO2020110934A1|2020-06-04|
    CN112368564A|2021-02-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPH0743635Y2|1989-10-20|1995-10-09|株式会社トクヤマ|Detection unit|
    JP4424906B2|2002-01-25|2010-03-03|大阪瓦斯株式会社|Dust measuring device|
    JP6077743B2|2011-12-27|2017-02-08|株式会社堀場製作所|Gas analyzer|
    NL2013138B1|2014-07-07|2016-09-09|M & G Group B V|Adapter for a flue gas outlet.|
    JP5976885B1|2015-06-09|2016-08-24|株式会社田中電気研究所|Light scattering dust densitometer capable of measuring even low-flow exhaust gas and dust concentration measuring method|
    CN206038525U|2016-08-31|2017-03-22|青岛明华电子仪器有限公司|Integral type ultraviolet flue gas analyzer|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2018220632A|JP2020085664A|2018-11-26|2018-11-26|Light scattering type dust concentration meter for white turbid exhaust gas|
    PCT/JP2019/045778|WO2020110934A1|2018-11-26|2019-11-22|Light-scattering-type dust concentration meter for cloudy exhaust gas|
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