• 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:
    There are exhaust gas analysis systems for determining the concentration of chemical components in exhaust gas streams with a fluid line (12) having a sample gas inlet (10) and a Probengasauslass (42), a measuring device (70) for determining the concentration of at least one component in the exhaust stream, which in the fluid line ( 12), a condensate separator (32) disposed upstream of the meter (70) in the fluid line (12), a condensate line (46) extending from a condensate outlet (44) of the condensate separator (32) to a condensate feed pump (48 ), known. To make these insensitive to ureas or other in the selective catalytic reaction in the exhaust system of internal combustion engines resulting intermediates and in particular to protect the condensate pump, the invention proposes that in the condensate line (46) downstream of the Kondensatabscheiders (32) and upstream of the condensate pump (48 ) a condensate filter (50) is arranged.
    公开号:AT518900A4
    申请号:T50976/2016
    申请日:2016-10-24
    公开日:2018-02-15
    发明作者:Volker Pointner Dr；Ing Schimpl Thomas
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    Exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams
    The invention relates to an exhaust gas analysis system for determining the concentration of chemical components in exhaust gas flows with a fluid line, with a sample gas inlet and a sample gas outlet, a measuring device for determining the concentration, at least one component in the exhaust gas flow, which is arranged in the fluid line, a condensate separator upstream of the Measuring device is arranged in the fluid line and a condensate line, which extends from a condensate outlet of the condensate to a condensate pump.
    Such exhaust gas analysis systems for measuring chemical components in exhaust gas streams are known and are used for example for determining concentrations of components in exhaust gas streams of internal combustion engines in motor vehicles. In addition to permanently installed analysis systems, for example on chassis dynamometers, mobile analysis systems are increasingly being used.
    Due to the ever stricter legislation and the resulting compulsion of automobile manufacturers to produce internal combustion engines with a lower amount of pollutants, an increasingly precise measurement is required, which is why disturbing factors must be excluded in sensitive measuring devices. Thus, it is known that, in particular, measuring instruments which operate at ambient temperatures or temperatures of below 80 ° C. are often very sensitive to the presence of water in the sample gas stream, since a condensation of the water vapor from the sample gas is to be expected in particular. Flier are, for example, the measurements of the oxygen concentration by means of an electrochemical or a paramagnetic analyzer, which uses the magnetic properties of oxygen to determine its concentration in a gas stream, the spectroscopic measurement of carbon monoxide, carbon dioxide or hydrocarbons by means of the non-dispersive infrared sensor or the spectroscopic measurement of nitrogen oxides by means of the non-dispersive ultraviolet analyzer.
    In the combustion of fuels in internal combustion engines, however, forms water vapor, which is dissolved in the exhaust gas, the exhaust gas is just saturated in the dew point with water vapor. If the temperature of the exhaust gas is lowered below the dew point, the water vapor condenses and the condensate is separated. To avoid inaccurate measurement results and increased wear of the measuring instruments, for example due to corrosion, such condensation in the measuring instrument is therefore urgently to be avoided.
    In exhaust gas analysis systems, condensate separators are therefore used upstream of these measuring devices for separating water from the sample gas streams, which contain water or water vapor-containing exhaust gases.
    They therefore use the lowering of the sample gas temperature below the dew point in a targeted manner in order to condense the water vapor contained in the gas and deposit it in front of the measuring device in order to dry the sample gas. For this purpose, the sample gas is passed through a cooler in a condensate, the condensate separated from the fluid in the condensate and discharged condensate separated via a condensate pump.
    Such an exhaust gas analysis system is known from EP 2 533 029 A1. In this system, both before the infrared analyzer and before the ultraviolet analyzer each a condensate separator is arranged, which prevents water from getting to the measuring instruments and especially that this can condense there or distort the measurement. The cooling temperatures of the condensate are chosen so that they are each above the dew point temperature of the gas to be analyzed, but are as low as possible in order to deposit the largest possible amount of water.
    Furthermore, a device for gas analysis is known from DE 1 946 210 A, in which a condensate separator is likewise arranged in front of a measuring device, to the gas outlet of which a filter element is additionally formed.
    In recent years, however, in the exhaust systems of internal combustion engines, systems for selective catalytic reduction are increasingly used, in which urea dissolved in water is injected into the exhaust gas to reduce nitrogen oxides in the exhaust gas. This is done first in a reactor in which by thermolysis from urea ammonia and
    Isocyanic acid are obtained, and then the isocyanic acid is converted with water into ammonia and CO2 by hydrolysis. Ammonia then reacts in an SCR catalyst with the nitrogen oxides in the exhaust gas, whereby nitrogen and water are formed.
    However, the amount of injected urea must always be adapted to the existing nitrogen oxide emissions and thus the existing engine condition, it therefore changes depending on the operating point of the engine. However, since this is not always completely successful, ammonia and isocyanic acid or unreacted urea, as well as degradation products from all components and reactions with the exhaust gas flow into the exhaust gas analysis systems, where they settle and form mostly bright deposits, are falsified by the measurement results, the measuring instruments are contaminated and the wear on pumps and other equipment is significantly increased, so that their life as well as the life of the measuring equipment drops significantly.
    It is therefore the object to provide an exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams, with which, despite not optimized injected amounts of urea in the exhaust system of a vehicle, a reliable and accurate measurement of the exhaust gas components is possible. In particular, aggregates should be protected from deposits that are formed by incrustations of urea, isocyanic acid or degradation products from the exhaust aftertreatment and reactions with components of the meter and are collectively referred to below the term soils, and significantly reduce the life of the units. Even measuring instruments that operate at low operating temperatures should provide reliable measurement results over a long service life and have a long service life.
    This object is achieved by an exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams with the features of claim 1.
    Because a condensate filter is arranged in the condensate line downstream of the condensate separator and upstream of the condensate feed pump, the undissolved contaminants are filtered out of the condensate, thereby reliably preventing damage to the condensate feed pump, which is designed in particular as a diaphragm pump, since the solid contaminants do not penetrate Inside the pump can get. The diaphragm pumps commonly used are very sensitive to solid and highly viscous soils, as they can accumulate between valve seat and valve plate and thus no longer close the valve seat and valve plate together. As a result, the pump can only generate little to no suppression and the delivery rate collapses, which is reliably prevented by the present arrangement.
    The condensate filter preferably has a filter surface made of woven, knitted fabric, fleece or paper. These have a large fine-meshed filter surface and are particularly suitable for filtering liquids from which solids must be filtered out.
    The pore size of the condensate filter is preferably 10 to 40 .mu.m, in particular 25pm. This grain size is exceeded by almost all solid contaminants in the condensate, so that can be expected with a very good filtering effect at the same time relatively low flow resistance. Such filters are offered, for example, as a fuel line filter.
    Advantageously, the condensate filter on a space which is continuously filled at least partially with condensate during operation, so that the filter surface is continuously wetted. This room fulfills a retention function of the condensate in case of failure of the condensate pump as this can be accommodated. Above all, however, the constant moisturization of the filter surface during normal operation clearly retards the crystallization of the urea, which increases the service life of the filter.
    Accordingly, the filter surface of the condensate filter should at least partially be arranged in the space filled with condensate in order to prevent the crystallization as completely as possible in this area of the filter.
    It is also advantageous if the filter surface of the condensate filter is hydrophilic, since in this way the filter surface not arranged in the condensate is kept moist and thus the crystallization at the filter surface is delayed.
    Preferably, the condensate filter is arranged geodetically below the condensate pump and the Kondensatabscheiders and arranged filled with the condensate part of the space below an inlet opening and an outlet opening of the condensate filter. Thus, a normal cylindrical design of a line filter can be used and arranged in a lying position to provide the space in a simple and cost-effective manner, which is filled with the condensate.
    Furthermore, it is advantageous if at least one sample gas filter is arranged in the fluid line between the condensate separator and the measuring device. This is used for the separation of solids and auskristallisierendem urea, which is optionally still dissolved in the residual water vapor of the sample gas stream or was transported as a solid particles with the gas stream or the residual water vapor from the condenser. Accordingly, subsequent devices are protected from crystallized contaminants.
    In a further embodiment of the invention, the sample gas filter immediately downstream of the Kondensatabscheiders and upstream of a pressure sensor of the Kondensatabscheiders and another sample gas filter is arranged immediately upstream of the measuring device in the fluid line. Thus, the pressure sensor of the condensate is protected from particles and created by the use of the third filter, a redundant system, in addition, when replacing the sample gas filter behind this penetrating dirt can not get into the meter.
    Furthermore, it is advantageous, downstream of the condensate filter and upstream of the condensate pump in the condensate line to arrange a further condensate filter, which also serves to filter contaminants that get into the system before the condensate pump when changing the first filter.
    Preferably, the one or more sample gas filters and / or the further condensate filter mesh filter with a stainless steel mesh. This has a high durability against crystallized urea or isocyanic acid and is insensitive to corrosion due to the water vapor present in the exhaust gas. This ensures a reliable filter effect over a long service life.
    The one or more sample gas filters and / or the further condensate filter preferably have a pore size of 50 to 90μηπ, in particular of 73μηπ on. With this pore size, the measuring instruments are protected against correspondingly larger particles of the harmful contaminants or crystallized residues of urea or isocyanic acid, so that the main part of the substances is separated, but too high flow resistance on the filter can be prevented by separating smaller particles.
    Preferably, the Kondensatabscheider is designed as a thermoelectric cooler with a cooling temperature for the sample gas flow of 2 ° C to 8 ° C. At this temperature, almost complete separation of the water from the sample gas is to be expected, since the water vapor should condense completely. With the water and the dissolved urea or crystals of isocyanic acid is then reliably deposited via the thermoelectric cooler from the rest of the sample gas stream.
    Preferably, the meter is a non-dispersive infrared analyzer. This is sensitive to the presence of water in the exhaust gas, but operates at relatively low temperatures, for example, about 59 ° C, so that energy can be saved and provides very accurate readings even at very low concentrations in real time in the determination of carbon monoxide and carbon dioxide content in sample gas stream.
    Furthermore, it is advantageous if an oxygen sensor is arranged downstream of the non-dispersive infrared analyzer in the fluid line. This can be designed, for example, as a paramagnetic analyzer, which uses the magnetic properties of the oxygen to determine its concentration in the sample gas stream and also provides very good measurement results. In the case of mobile measuring devices, the smaller electrochemical oxygen sensors which operate according to the amperometric or potentiostatic measuring principle are usually used.
    Furthermore, it is advantageous if, upstream of the condensate separator, a bypass line branches off, via which the measuring device can be bypassed. Thus, not the entire sample gas flow is passed through the condensate and must not be cooled down so far and later reheated accordingly, which energy is saved. In addition, it is possible to determine the relative humidity of the sample gas flow downstream of the first thermoelectric cooler in the bypass channel.
    In a further embodiment of the invention, a measuring device is arranged in the fluid line upstream of the condensate separator, upstream of which a water trap is arranged. This first separates the water present in liquid form in the sample gas stream and ureas and intermediate products of the selective catalytic reduction dissolved therein, as well as other solid contaminants, thereby protecting the following measuring instruments.
    In a preferred embodiment, a second condensate separator is arranged in the fluid line upstream of the water trap, via which water vapor originating from the sample gas is also deposited. Since the amounts of water in the up to 500 ° C warm exhaust gas may be very large and thus much water must be deposited, water droplets can be entrained or carried out aftercondensation. This water is then also on the water trap still removable from the system.
    The second condensate separator is also preferably designed as a thermoelectric cooler but with a cooling temperature for the sample gas flow of 20 ° C to 30 ° C. Thus, a major part of the water vapor can be reliably condensed out of the exhaust gas before the first measuring device.
    Preferably, the second meter is a non-dispersive ultraviolet analyzer for measuring nitrogen monoxide and nitrogen dioxide concentrations, which can also be measured in real time despite expected low concentrations with high accuracy at room temperature, usually the internal temperature of the NDUV analyzer is about 50 ° C is. Compared to water vapor, the NDUV is insensitive due to its high selectivity, but the ingress of liquid water should be avoided to avoid damage to the analyzer.
    Thus, an exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams is provided, which is resistant to deposits of urea or intermediates of the selective catalytic
    Reduction is insensitive and continues to provide reliable results even with the smallest concentrations of the components to be measured. In addition, the life of the measuring devices and condensate pumps used is significantly increased, as damage caused by crystallizing previously dissolved in the water components are avoided.
    An exhaust gas analysis system according to the invention for determining the concentration of chemical components in exhaust gas streams is described below with reference to a non-restrictive exemplary embodiment illustrated in the figures.
    FIG. 1 shows a flow chart of an exhaust gas analysis system according to the invention.
    FIG. 2 shows a schematic sectional view of a condensate filter in the installed position in the exhaust gas analysis system according to the invention.
    The exhaust gas analysis system shown in FIG. 1 has a sample gas inlet 10, via which exhaust gas from an internal combustion engine or an exhaust gas auxiliary gas mixture flow into the exhaust gas analysis system. The sample gas inlet 10 leads into a fluid line 12, which may optionally be designed as a heated line in the front area. This heated line section of the fluid line 12 terminates in a heated particulate filter 14 where solids can be separated from the sample gas stream and, if desired, analyzed.
    The fluid line 12, which is usually designed below as a corrosion-resistant stainless steel line, leads into a second condensate separator 16 via which the water condensed from the sample gas stream due to the cooling in the stainless steel line is deposited via a condensate discharge line 18. The second Kondensatabscheider 16 is designed as a thermoelectric cooler, in which the sample gas stream is cooled down to a temperature of about 25 ° C. In this thermoelectric cooler, a water vapor portion still present in the sample gas stream is correspondingly condensed and removed via a further condensate discharge line 20. For this purpose, the Kondensatabführleitungen 18, 20 are each connected to a pump head 21 of a double-headed diaphragm pump, which serves as a condensate pump 22, wherein before each pump head 21, a mains filter 23 is arranged to separate solids from the condensate stream.
    The sample gas stream freed from this water vapor fraction flows out of the second condensate separator 16 in the direction of a measuring device 24, which is designed as a non-dispersive ultraviolet analyzer and by means of which the concentrations of nitrogen monoxide and nitrogen dioxide can be determined. Nitrogen dioxide and water vapor are both present as gases in the exhaust gas at sufficiently high temperatures, as long as they do not condense. However, if a portion of the water vapor condenses so that water is in the liquid phase, gaseous nitrogen dioxide may dissolve therein and be pumped out with the precipitated condensate, making this proportion unavailable for the measurement. These losses would be even greater when the cooler temperature is below the condensation point of nitrogen dioxide of about 21 ° C, since this then itself partially liquefied, whereby the amount dissolved in the water would be even greater. However, in order to be able to determine the total nitrogen oxide content, the temperature to which the sample gas stream is cooled down, kept above 21 ° C, ie always above the boiling point of the gas to be analyzed.
    In order to prevent damage to the measuring device 24 by water later separated from the gas flow or entrained by the gas flow, a water trap 26 is disposed in the fluid line 12 in front of the measuring device 24, which on the one hand has a PTFE membrane for separating this water, while water vapor passes through the membrane, and on the other hand has a fine filter fleece, over which contaminants, which are still contained as suspended particles in the sample gas stream, for example, can be separated from this. The measurement in the measuring device 24 takes place at a temperature of the sample gas of about 57 ° C, so that further condensation of water vapor in the meter 24 can be excluded.
    The sample gas flowing out of the measuring device 24 subsequently reaches a branch 28, at which a bypass line 30 for bypassing a following condensate separator 32 branches off from the fluid line 12 and which is arranged in the continuing fluid line. The bypass line leads to a humidity sensor 34, in which the relative water content and the temperature of the sample gas flow are determined. Via a further filter 36 and a flow restrictor 38, the sample gas then flows again with the
    Sample gas stream from the fluid line 12 together and is conveyed via a feed pump 40 to a Probengasauslass 42.
    The Kondensatabscheider 32 is again formed as a thermoelectric cooler, in which, however, the sample gas is cooled to about 5 ° C for condensate separation, so that the saturation point of the sample gas is shifted and additional water from the sample gas stream fails, leaving the Kondensatabscheider 32 via a condensate outlet 44 and is conveyed into a condensate line 46 by means of a condensate feed pump 48, which is designed for example as a double-head diaphragm pump.
    According to the invention, a condensate filter 50 is arranged in the condensate line 46 upstream of the condensate feed pump 48. This condensate filter 50 has in particular a hydrophilic paper filter surface 52 with a pore size of about 25 pm, which is arranged in a space 54 which is constantly filled with the condensate by the condensate filter 50 is arranged on the one hand at the lowest position of the condensate line 46 and on the other an inlet opening 56 and an outlet opening 58 of the condensate filter 50 are arranged above this space 54. This is easy to produce, for example, in that the condensate filter 50 is designed as a line filter with centric inlet opening 56 and outlet opening 58 and is mounted in a lying position, as shown in FIG. The lower half of the condensate filter 50 is constantly filled with condensate in this installation position in the system and forms the space 54. Since the amount of injected urea varies depending on the engine operating point and thus over time, the amount of contaminants contained in the condensate over the time is different. As a result, gelatinous thickenings of the condensate, for example, by polymerization of reaction products or crystallization occur at times high concentrations of impurities in the exhaust gas and thus in the deposited condensate. By the described arrangement of the condensate filter 50 accumulates over a certain period of time in the space 54 of the condensate filter 50, the condensate, gelatinous thickening or existing crystals in the unsaturated condensate in the space 54 can be resolved again. The space 54 filled with condensate acts like a buffer, which absorbs impurities up to the saturation limit of the condensate and can pass on in the direction of the condensate feed pump 48 in liquid form. Insoluble components are retained by the condensate filter 50 and deposits occurring due to supersaturation can sink and be retained in the lower part of the condensate filter 50 until they are removed by re-dissolution via the outlet 58 in the direction of the condensate feed pump 48 in liquid and hence harmless form or by replacement of the condensate filter 50 are removed from the system. Furthermore, the constant filling of the lower space 54 of the condensate filter 50 with condensate has the consequence that substances dissolved in the water, in particular residues of injected urea or intermediates of a selective catalytic reduction, such as isocyanic acid in the dissolved state, remain on the filter surface 52 or these depending on the size happen. At the dry upper part of the filter surface 52, the dissolved substances will crystallize out and be removed from the system during filter replacement. In addition, the condensate filter 50 can absorb additional condensate in case of failure of the condensate pump 48 until the upper additional volume 60 is filled. In particular, the condensate pump 48 is reliably protected by this condensate filter 50 from the urea and the isocyanic acid, which would otherwise deposit as white, crusty deposits in the condensate pump 48 and would lead to significantly increased wear and finally malfunction of the condensate pump 48.
    In addition, downstream of this condensate filter 50 another condensate filter 62 is arranged in front of the condensate feed pump 48, which is designed as a mesh filter with a stainless steel mesh as a filter surface, which has a pore size of 73pm. This condensate filter 62 serves to protect the condensate pump 48 in case of damage to the filter surface 52 of the condensate filter 50 and a change of the condensate filter 50, so that when changing into the condensate line 46 penetrating contaminants can also be filtered out before reaching the condensate pump 48. The condensate leaving the condensate feed pump 48 flows into a condensate discharge line 64, into which the condensate of the two other condensate feed pumps 22 also flows and which opens into the fluid line 12 downstream of the sample gas feed pump 40. On the
    Probengasauslass 42 is then discharged both the sample gas and the condensate.
    The fluid line 12 first leads from the condensate separator 32 to a first sample gas filter 66, which is arranged directly in front of a pressure sensor 68 and protects it against contaminants or crystallized urea or isocyanic acid. It is also preferably a net filter with a stainless steel mesh, with a pore size of about 73μιτι as a filter surface. By means of this pressure sensor, a pressure correction of the measurement results is made and checked whether sufficient pressure for conveying the sample gas to a measuring device 70 is present downstream of another sample gas filter 72, which also designed as a net filter with a stainless steel mesh with a pore size of about 73pm as a filter surface is disposed in the fluid line 12 and is protected by the sample gas filter 72 from penetrating contaminants or urea.
    The meter 70 is a non-dispersive infrared analyzer used to determine the concentration of carbon dioxide and carbon monoxide in the exhaust gas. This is due to the proximity of the spectral lines of the water vapor to carbon monoxide sensitive to its measurement results in the presence of water vapor. For this reason, the water separation takes place in the condensate 32 at the lowest possible temperatures, so that the separated water content is correspondingly high. The low temperatures are not detrimental to the following measurement process, since carbon oxides dissolve only in very small amounts in liquid water and in particular have a boiling point that is significantly lower than that of the water. By prefiltering the sample gas filters 66 and 72 as well as the condensate separation, the measuring device 70 achieves very good measurement results. In addition, the penetration of the meter 70 damaging substances such as urea or isocyanic acid is reliably prevented.
    Downstream of the measuring device 70, an oxygen sensor 74 is still arranged in the fluid line 12, which may be formed as an electrochemical sensor, which performs the concentration determination of the oxygen in the sample gas stream according to the amperometric measuring principle. Via a further network filter 76, the sample gas stream finally reaches the sample gas delivery pump 40 and thus the sample gas outlet 42 via a flow restrictor 78, via which the delivered gas quantities are adjusted.
    Thus, an exhaust gas analysis system is provided for determining the concentration of chemical components in exhaust gas streams which, even when used in internal combustion engines in which the selective catalytic reduction by means of urea is used for emission reduction, very accurate measurement results and the components, such as the measuring devices but in particular Also the condensate pumps are reliably protected against increased wear and other damage. For this purpose, filters are used according to the invention, on the one hand separate crystallized urea and on the other hand on the condensate filter such crystallization as long as possible to increase the useful life of the system.
    It should be clear that the scope of the main claim is not limited to the embodiment described. In particular, the claimed filtering can be used both on stationary and on mobile analysis systems with and without dilution. Also, the structure of the system may vary and, for example, additional meters may be used or only a single meter may be present.
    权利要求:
    Claims (20)
    [1]
    1. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams with a fluid line (12) having a sample gas inlet (10) and a Probengasauslass (42), a measuring device (70) for determining the concentration of at least one component in the exhaust stream, which in the fluid line ( 12), a condensate separator (32) disposed upstream of the meter (70) in the fluid line (12), a condensate line (46) extending from a condensate outlet (44) of the condensate separator (32) to a condensate feed pump (48 ), characterized in that a condensate filter (50) is arranged in the condensate line (46) downstream of the condensate separator (32) and upstream of the condensate feed pump (48).
    [2]
    2. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to claim 1, characterized in that the condensate filter (50) has a filter surface (52) made of fabric, knitted fabric, non-woven or paper.
    [3]
    3. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 1 or 2, characterized in that the pore size of the condensate filter (50) is 10 to 40 pm.
    [4]
    4. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 1 to 3, characterized in that the condensate filter (50) has a space (54) which is continuously filled during operation at least partially with condensate.
    [5]
    5. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 1 to 4, characterized in that the filter surface (52) of the condensate filter (50) is at least partially disposed in the space filled with condensate (54).
    [6]
    6. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 1 to 5, characterized in that the filter surface (52) of the condensate filter (50) is hydrophilic.
    [7]
    7. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 1 to 6, characterized in that the condensate filter (50) below the condensate pump (48) and the Kondensatabscheiders (32) is arranged and filled with the condensate part of Space (54) below an inlet opening (56) and an outlet opening (58) of the condensate filter (32) is arranged.
    [8]
    8. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 1 to 7, characterized in that between the Kondensatabscheider (32) and the measuring device (70) in the fluid line (12) at least one sample gas filter (66, 72) is.
    [9]
    9. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 1 to 8, characterized in that the sample gas filter (66) immediately downstream of the Kondensatabscheiders (32) and upstream of a pressure sensor (68) of the Kondensatabscheiders (32) and another Sample gas filter (72) is arranged immediately upstream of the measuring device (70) in the fluid line (12).
    [10]
    10. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 1 to 9, characterized in that downstream of the condensate filter (50) and upstream of the condensate pump (48) in the condensate line (46) another condensate filter (62) is arranged ,
    [11]
    11. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 8 to 10, characterized in that the one or more sample gas filters (66, 72) and / or the further condensate filter (62) are net filter with a stainless steel mesh.
    [12]
    12. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 8 to 11, characterized in that the one or more sample gas filters (66, 72) and / or the further condensate filter (62) have a pore size of 50 to 90pm.
    [13]
    13. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 1 to 12, characterized in that the Kondensatabscheider (32) is designed as a thermoelectric cooler with a cooling temperature for the sample gas flow of 2 ° C to 8 ° C.
    [14]
    14. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 1 to 13, characterized in that the measuring device (70) is a non-dispersive infrared analyzer.
    [15]
    15. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to claim 14, characterized in that downstream of the non-dispersive infrared analyzer in the fluid line, an oxygen sensor (74) is arranged.
    [16]
    16. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 1 to 15, characterized in that upstream of the Kondensatabscheiders (32) branches off a bypass line (30) via which the measuring device (70) is bypassed.
    [17]
    17 exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 1 to 16, characterized in that in the fluid line upstream of the Kondensatabscheiders (32) a measuring device (24) is arranged upstream of which a water trap (26) is arranged.
    [18]
    18. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to claim 17, characterized in that upstream of the water trap (26), a second Kondensatabscheider (16) in the fluid line (12) is arranged.
    [19]
    19. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to claim 18, characterized in that the upstream of the water trap (26) arranged second Kondensatabscheider (16) formed as a thermoelectric cooler with a cooling temperature for the sample gas flow of 20 ° C to 30 ° C. is.
    [20]
    20. exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams according to one of claims 16 to 18, characterized in that the measuring device (24) between the two Kondensatabscheidern (16, 32) is a non-dispersive ultraviolet analyzer.
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3784902A|1971-12-08|1974-01-08|Ikor Inc|Apparatus for sensing particulate matter|
    EP0291630A2|1987-05-15|1988-11-23|Gröger & Obst Mess- und Regeltechnik GmbH|Process and apparatus for pretreatment of a gas to be analysed|
    DE9101410U1|1991-02-07|1992-03-05|Siemens Ag, 8000 Muenchen, De|
    US20050160838A1|1998-09-09|2005-07-28|Christopher Weaver|System for extracting samples from a stream|
    DE102004060352B3|2004-12-15|2006-05-18|Siemens Ag|Exhaust gas tester, for internal combustion engine of motor vehicle, has suction device close to exhaust pipe of engine, where device sucks exhaust gas from gas outlet of analyzing unit via exhaust gas return pipe to dispose gas|
    EP2937679A1|2014-04-25|2015-10-28|AVL List GmbH|Particle measuring device and a method for operating the particle measuring device|
    AT522776A1|2019-11-29|2021-01-15|Avl List Gmbh|Method for testing the functionality of auxiliary units in an exhaust gas analysis system|
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    申请号 | 申请日 | 专利标题
    ATA50976/2016A|AT518900B1|2016-10-24|2016-10-24|Exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams|ATA50976/2016A| AT518900B1|2016-10-24|2016-10-24|Exhaust gas analysis system for determining the concentration of chemical components in exhaust gas streams|
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