• 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:
    The present invention indirectly heat-exchanged exhaust gas as external air using an air-cooled heat exchanger to cool and condense the exhaust gas to lower absolute humidity, and the dry and heated external air used for cooling is saturated with moisture. By reducing the relative humidity in the mixed gas by mixing with, the mixed gas discharged into the atmosphere does not exhibit white smoke and suppresses the increase of specific gravity due to condensed water content, thereby increasing the diffusion effect into the atmosphere. As it can eliminate the fall (falling) of the material, A heat exchanger that cools the contaminants by removing the incoming exhaust gas into the fin tube for heat exchange; A connecting duct communicating with the outlet end of the heat exchanger and passing therein to the upper part of the heat exchanger; and after passing through the exhaust gas and the heat exchanger injected through a nozzle formed at the outlet end of the connection duct. A mixer in which the heated external air is mixed with each other: consists of a mixer in series with a heat exchanger so as to communicate with the stack, and mixes the external air used for cooling with the exhaust gas to reduce the humidity of the mixed exhaust gas to reduce white smoke. It includes the step of removing.
    公开号:KR20010100291A
    申请号:KR1020000018841
    申请日:2000-04-11
    公开日:2001-11-14
    发明作者:김병우
    申请人:김병우；
    IPC主号:
    专利说明:

    Method and apparatus to remove white smoke}
    [12] The present invention relates to a method and apparatus for removing white smoke generated by moisture in exhaust gas, and more particularly, to air pollution control in the field of environmental engineering. Details include white smoke (water vapor generated by moisture in exhaust gas). ), The exhaust gas supersaturated with moisture is indirectly heat-exchanged as external air using an air-cooled heat exchanger to cool and condense the exhaust gas, thereby reducing absolute humidity, and drying and heated external temperature used for cooling. By mixing air with the exhaust gas saturated with water, it lowers the relative humidity (Relative Humidity (RH)) in the mixed gas, so that the mixed gas discharged into the atmosphere does not show white smoke and suppresses the increase in specific gravity due to condensation. By increasing the diffusion effect of the condensation water and contaminants fall (fallout) around the stack It relates to a method and apparatus for removing white smoke.
    [13] In general, incinerators, metal melting furnaces, and wet desalination facilities that discharge air pollutants discharge high-temperature exhaust gas containing high concentration pollutants into the atmosphere during operation to remove pollutants contained in the exhaust gas. In order to remove the harmful substances by spraying the aqueous solution, an absorption tower (wet dust collecting facility) was mainly used.
    [14] As the wet dust collector sprays water on the discharged high-temperature exhaust gas, the exhaust gas at the outlet is discharged to the atmosphere through a stack in a state of high temperature and high humidity (saturation). At this time, since the moisture contained in the exhaust gas contains contaminants and saturated water that could not be removed in the wet dust collecting facility, the exhaust gas containing saturated water when discharged from the stack is immediately cooled by a cold outside atmosphere. Saturated water in the exhaust gas, which is condensed and has an increased specific gravity, falls into the water droplets (condensation) in a state of falling down near the stack and contaminates the stack.
    [15] In addition, the water droplets, which are relatively low-density droplets, do not spread and fall while forming white lead, which is a steam band, to a certain distance from the stack, and the dropped water droplets have a strong acidity, thus deteriorating the ecological environment. There was this.
    [16] Here, when examining the characteristics of the exhaust gas directly related to the present invention, the exhaust gas discharged from the source equipment such as the incinerator contains saturated moisture at a high temperature, and utilizes a known Psychometric Chart. In order to examine the physical characteristics of the humid exhaust gas, the curve of increase in absolute humidity is gentle in the range of 0 ~ 55 ℃ according to the tx curve (t: temperature, x: absolute humidity), which coordinates dry bulb temperature and absolute humidity. Gradually increasing), the absolute humidity in the 56 ~ 65 ℃ region increases along the sharp rise curve, the absolute humidity is increased by a slight temperature difference close to the vertical in the 66 ~ 99 ℃ region.
    [17] Therefore, when the temperature exhausted from the wet dust collecting facility, that is, the exhaust gas in the region of 50 to 99 ° C. is cooled to an economical temperature (inlet / outlet temperature difference: 6 to 12 ° C. difference) using a known air-cooled heat exchanger, The moisture contained condenses as much as the temperature difference. The exhaust gas property of the heat exchanger outlet has a temperature range obtained by subtracting the cooling temperature difference of the heat exchanger from the inlet exhaust gas temperature and contains absolute moisture saturated at this temperature.
    [18] Among the known technologies, the method having the most similarity to the present invention is as shown in FIG. There was a method of discharging to the atmosphere through the air, and the dry external air supplied for cooling was also used for heat transfer in the heat exchanger and then directly discharged to the air.
    [19] That is, in the conventional method, as shown in FIG. 3, the exhaust gas containing water is cooled by about 5 to 12 ° C. while passing through the cooling tube 32 inside the air-cooled heat exchanger 33 through the inlet duct 31. The condensed water generated by the cooling temperature difference is discharged through the discharge pipe 41 and stored in the storage tank 42 to be recycled.
    [20] The cooled exhaust gas is discharged into the atmosphere at a low speed of 12 to 18 m / sec through the flue 35 through the outflow duct 34, but contains saturated water as much as the temperature of the exhaust gas. When condensation occurs immediately, it falls to the surroundings, and visible white smoke, which is visible, is generated.
    [21] Meanwhile, the external air introduced for cooling flows into the shell of the heat exchanger 33 through the introduction pipe 37, the blower 38, and the inlet duct 39 to cool the exhaust gas. It is directly discharged to the atmosphere through 40.
    [22] The problem with applying the conventional method as described above is that although the exhaust gas passing through the heat exchanger 33 is condensed and removed by a substantial portion of the temperature difference between the inlet and the outlet, at the outlet temperature of the heat exchanger 33. It contains saturated absolute humidity, and in this state, it is discharged into the atmosphere through the stack 35, and at the same time, the moisture in the exhaust gas is rapidly condensed by the cold atmosphere, and the condensed moisture has a heavy specific gravity, so that the surrounding area of the stack 35 is high. It dropped to the ground, causing the pollution and visible pollution in the form of water vapor.
    [23] On the other hand, as the white smoke prevention method developed and used in the prior art, the exhaust gas reheating method, the exhaust gas water cooling method, the exhaust gas air cooling method and the demister (demister) and the like are known.
    [24] That is, the exhaust gas reheating method reheats the exhaust gas containing saturated water by using an after burner and fuel, so that the exhaust gas is discharged to the atmosphere after raising the temperature of the exhaust gas to lower the absolute humidity. Although there is an effect of suppressing the generation of white smoke, there is a problem in that the maintenance cost of the device is very high, because the consumption of fuel is large, the installation cost is high because the device is complicated.
    [25] Therefore, this exhaust gas reheating method is limited to the case where there is waste heat around the apparatus due to economical efficiency or for special purposes.
    [26] In addition, the exhaust gas water cooling method cools the exhaust gas temperature by a water-cooled condenser, and the cooling water used for cooling the condenser is cooled by using an air-cooled cooling tower to maintain a constant water temperature. In this method, the exhaust gas temperature is lowered as much as the cooling tower performance to condense and remove moisture, while the exhaust gas after passing through the cooling tower is also saturated at the corresponding temperature, so that a large amount of contact with the cold atmosphere in the stack is required. Condensate is generated to contaminate the surroundings, and there are many facilities such as air-cooled cooling towers used to lower the temperature of the cooling water, which requires a lot of equipment costs, and the required area has a large disadvantage and low efficiency.
    [27] In addition, the exhaust gas air cooling method is a method used in the previous step of the present invention, by cooling the exhaust gas using an air-cooled heat exchanger to reduce the absolute humidity by a corresponding cooling temperature to condense and remove moisture. While the structure is simple, as described above, the saturation humidity is equivalent to the exhaust gas temperature after passing through the heat exchanger, and when the exhaust gas is discharged from the stack to the atmosphere, white smoke is formed and the efficiency is low.
    [28] In addition, the demister method is to install a device that can remove the water droplets (Mist) in the exhaust outlet, it is possible to physically remove the mist (Mist) already generated in the exhaust gas, but the saturated It is the least efficient way to remove moisture.
    [29] As described above, the conventional exhaust gas reheating process is highly efficient but requires a large amount of fuel to raise the exhaust gas temperature, thereby resulting in economic problems, and the exhaust gas water cooling method requires additional cooling towers and required area for maintaining a constant cooling effect. The burden is high and the smoke prevention effect is low, and the exhaust gas air cooling method and the demister method are also difficult to apply due to their low effect.
    [30] Therefore, the reality is that most white smoke is observed in the stacks of existing plants using the conventional method as described above.
    [31] Accordingly, the present invention has been made to solve the above problems, the object is to suppress the occurrence of white smoke due to the moisture contained in the exhaust gas, to solve the problem of contamination due to the drop of water around the stack, visible The solution aims to eliminate pollution and provide an ideal method of removing white smoke with low maintenance costs.
    [32] In addition, another object of the present invention is to suppress the generation of white smoke due to the moisture contained in the exhaust gas, to solve the pollution problem caused by the drop of water around the stack, to solve the visible pollution, while maintaining maintenance costs Let's provide an ideal white smoke removal device.
    [1] 1 is a schematic view showing an apparatus employing a method of removing white smoke according to the present invention;
    [2] 2 is a block diagram showing a white smoke removal apparatus according to the present invention,
    [3] 3 is a conceptual diagram of a water condensation method using a general air-cooled heat exchanger.
    [4] Explanation of symbols on the main parts of the drawings
    [5] 2 .... Inlet duct 3 ..... Wet dust collector
    [6] 4 .... Spray Nozzle 8 ..... Heat Exchanger
    [7] 8b ... Finned tube for heat exchange 9 ..... Connection duct
    [8] 10 ... Measuring port 11 .... Nozzle
    [9] 12 .... mixer 15 .... stack
    [10] 18 .... Blower 20 .... Splitter
    [11] 21 .... Shell 22 .... Body
    [33] In order to achieve the above object, as a specific configuration, the present invention,
    [34] In the method for removing the white smoke generated by the moisture contained in the exhaust gas,
    [35] A method of removing white smoke, the method comprising: installing a mixer in series with a heat exchanger so as to communicate with a stack and mixing external air used for cooling with exhaust gas to reduce the humidity of the mixed exhaust gas to remove white smoke. By provision.
    [36] In addition, the present invention is a device for removing the white smoke discharged from the stack due to the moisture contained in the exhaust gas,
    [37] A heat exchanger that cools the contaminants by removing the incoming exhaust gas into the fin tube for heat exchange;
    [38] A connection duct communicating with an outlet end of the heat exchanger to guide exhaust gas passing through the heat exchanger to an upper portion of the heat exchanger;
    [39] And a mixer in which exhaust gas injected through a nozzle formed at an outlet end of the connection duct and an external air heated and dried after passing through the heat exchanger are mixed with each other.
    [40] Hereinafter will be described in detail with respect to the application example of the present invention.
    [41] 1 is a schematic diagram showing an apparatus employing a white smoke removal method according to the present invention, Figure 2 is a block diagram showing a white smoke removal apparatus according to the present invention.
    [42] As shown in FIG. 1, the exhaust gas reheating method and the exhaust gas water cooling method, which are generally used as a method of removing smoke, are combined with an indirect air cooling system to mix and discharge dry external air with humid exhaust gas to generate white smoke. It is to suppress.
    [43] That is, in this method, the mixer 12 is installed in series with the heat exchanger 8 so as to communicate with the stack 15, and the outside air used for cooling is mixed with the exhaust gas to lower the humidity of the mixed exhaust gas, thereby reducing the white smoke. As comprising a step of removing, this step is composed of a dust collecting step, an outdoor air inlet step, a first heat exchange step, a second heat exchange step and a discharge step.
    [44] First, the dust collecting step is to remove contaminants in the exhaust gas discharged from the source 1 such as incinerators, metal melting furnaces and wet desulfurization facilities, and the dust collecting process is carried out through the inlet duct 2 into the wet dust collector 3. The exhaust gas flows in, and the circulating water supplied by the absorbent liquid supply pump 6 into the wet dust collector 3 is sprayed into the fine particles through the spray nozzle 4 to simultaneously absorb and remove contaminants contained in the exhaust gas. Cool the exhaust gas.
    [45] At this time, the exhaust gas from which the pollutants have been removed from the wet dust collector 3 contains supersaturated water, and when the exhaust gas is discharged directly into the atmosphere or through a stack at the outlet of the wet dust collector 3, white smoke, which is a large amount of water vapor, is produced. Will be discharged.
    [46] In addition, the external air inflow step is to forcibly introduce external air to the shell 21 under the main body 22 in which the heat exchanger 8 into which the exhaust gas from which the pollutant is removed is introduced from the wet dust collector 3 is introduced. . The forced inflow of external air disperses the external air into the shell 21 through the blower 18 forcibly sucking the external air for cooling, the silencer 17 and the introduction duct 19 to reduce the noise generated during the suction. Made by a distributor 20 for supplying.
    [47] Accordingly, the cooling external air forcibly introduced into the shell 21 is disposed in the main body 22 on the shell 21 to supply the exhaust gas from which the pollutant is removed from the wet dust collector 3. The exhaust gas is cooled while passing through the heat exchange fin tube of 8), and the external air is subjected to the first heat exchange step of raising and drying the temperature.
    [48] That is, in the first heat exchange step, the exhaust gas passes through the inside of the heat exchange fin tube of the heat exchanger 8, and the external air for cooling forced into the shell 21 is applied to the heat exchanger 8. The exhaust gas passing through the heat exchange fin tube outside and exiting the connection duct 9 through the inside of the heat exchange fin tube is in contact with the outer surface of the heat exchange fin tube of the heat exchanger 8. It cools by the temperature difference with external air, and the moisture corresponded to a cooling temperature difference condenses.
    [49] At this time, the condensed condensed water is stored in the condensate tank 24 through the discharge pipe 23 provided on the lower side of the heat exchanger 8 or circulated to be reused as the circulating water of the wet precipitator 3.
    [50] On the other hand, the outside air that is in contact with the outer surface of the heat exchange finned tube to the upper side to cool the exhaust gas is heated to 50 to 60 ℃ while being heat-exchanged with the high-temperature exhaust gas, dried.
    [51] Subsequently, the exhaust gas which has passed through the heat exchanger 8 contains saturated water at an outlet temperature, and this exhaust gas has an upper portion of the heat exchanger 8 through a connecting duct 9 connected to the outlet side. It is supplied to the mixer (Mixing Chamber) 12 provided on the side.
    [52] At this time, it is preferable to design the temperature difference between the inlet and the outlet of the heat exchanger 8 to 6 to 12 ° C. due to the temperature after cooling, which is the outlet temperature of the heat exchanger 8, and the economical efficiency of the facility. ) And the mixer 12 may be provided with a measuring instrument 10 specified in the Air Quality Preservation Act to directly analyze the pollution degree of the exhaust gas exhausted through the connection duct 9 after heat exchange.
    [53] On the other hand, the secondary heat exchange step is performed in the mixer 12, the temperature rises and dried outside air passing through contact with the outer surface of the heat exchange fin tube of the heat exchanger 8, is installed at the outlet end of the connection duct (9) In addition, the exhaust gas injected through the plurality of nozzles 11 disposed in the inner space of the mixer 12 is completely mixed in the mixer 12 and heat-exchanged with each other so that there is no temperature difference.
    [54] Accordingly, the cooling external air, which is about 4 to 5 times more dry than the exhaust gas, is finally mixed with the exhaust gas containing saturated moisture in the mixer 12 while maintaining a relative humidity within 40. It is to perform the discharge step discharged to the atmosphere through the stack 15, which is the discharge port without white smoke.
    [55] At this time, the flow velocity inside the stack 15 is high speed of 19 to 32m / sec so that the exhaust gas mixed with the outside air can be quickly diffused into the atmosphere by using the power of the blower 18 for inflowing the cooling outside air It is preferable to discharge.
    [56] In FIG. 1, reference numeral 23 denotes a porous plate installed above and below the heat exchanger 8 to facilitate passage of external air via the heat exchanger 8.
    [57] As mentioned above, as can be seen from the result of comparing the present invention with the conventional method shown in FIG. 3, the key distinguishing factor is that the external air supplied for cooling and heated and dried (humidified) is not reused in the conventional method. As it is exhausted into the atmosphere through the outflow duct 40, but in the present invention, the humidified exhaust gas and dry external cooling air are mixed in the mixer 12 in which the nozzles 11 shown in Figs. It is to remove the white smoke generation by external discharge through 15).
    [58] In order to prove the effectiveness of the fume removal method presented in the present invention, a model experiment was conducted. At this time, the white smoke removal apparatus 100 employed in the model test is as shown in Figure 2, in order to maintain similar conditions to the actual application facility, the exhaust gas generating source (1), forced air-cooled heat exchanger (8) and blower (18) And a connection duct (9) communicating with the heat exchanger (8) and a mixer (12) having a nozzle (11) in order to mix external air for cooling.
    [59] At this time, the apparatus 100 evaporates water by using an electric heater 51 in the exhaust gas generator 1 to impart similar conditions to the exhaust gas of the wet dust collector 3, thereby saturating the saturated moisture at a temperature of 81 캜. A heat exchanger configured to generate exhaust gas, and to use a heat exchange fin tube 8b through an introduction portion 8a of the forced air-cooled heat exchanger 8 through the exhaust gas amount adjusting mechanism 52 and the inlet duct 2; 8) Inflow exhaust gas into
    [60] As the heat exchange fin tube 8b has a helical fin protruding from the outer surface of the heat exchanger to cool the exhaust gas temperature to 73 ° C., the condensed water generated by the heat exchanger temperature difference is discharge pipe 5. ) Is sent to the tank of the exhaust gas generator 1 for reuse.
    [61] Then, the cooling external air is introduced into the shell 21, which is the lower part of the main body 22, by the blower 18 through the air flow adjusting device 19a and the introduction duct 19, and then the air supply nozzle of the distributor 20. It flows into the lower side of the heat exchanger 8 via 20a, and contacts the outer surface of the fin tube 8b of the heat exchanger 8.
    [62] Meanwhile, the exhaust gas passing through the heat exchanger fin tube 8b of the heat exchanger 8 flows into the mixer 12 through the connecting connection duct 9, and then exits the outlet of the connection duct 9. It is sprayed from the mixing jet nozzle (11) installed in.
    [63] At this time, the condition of the outside air used for the model test was introduced in the outdoor air at 0 ℃ during the winter season, and the experiment was conducted using the cold atmosphere in the winter season because the white smoke is more severely formed in the season when the outside air is cold. The test was conducted in January.
    [64] That is, the external air introduced for cooling is 0 ° C at the introduction point A, and rises to 60 ° C at the point B after the passage of the fin tube 8b of the heat exchanger 8. At this time, the hot exhaust gas passing through the fin tube 8b is cooled by the cooling temperature difference and then sprayed through the nozzle 11 in the mixer 12 via the connection duct 9.
    [65] In addition, the cooling external air dried and heated while passing through the heat exchanger 8 is completely mixed with the humid exhaust gas injected through the nozzle 11 in the mixer 12 so that the mixed gas properties are 62 ° C. and relative humidity. After being dampened (dryed) to 36, it diffuses into the atmosphere through the stack 15.
    [66] In this experiment, the key factors related to the generation and suppression of smoke are the process of changing the moisture of exhaust gas, cooling air, and mixed gas, so the detailed test results at each point are shown in Table 1 below.
    [67] Moisture change test result through the testExhaust gas at heat exchanger inlet (D)Exhaust gas at the heat exchanger outlet (E)External air for cooling before passing through heat exchanger (A)External air for cooling after passing through heat exchanger (B)Mixed gas after mixed cylinder (C) Air volume (Sm 3 / hr)463463240024002863 Temperature (℃)817306062 Absolute Humidity (kg H 2 O / kg Dry Air)0.589170.334340.002260.002260.0544 Relative Humidity ()100100601.536 Condensate (kg / hr)0109.7000
    [68] As can be seen from the experimental results of Table 1, the mixed gas mixed with the cooling external air and the exhaust gas after passing through the mixer 12 has an absolute humidity of 0.0544 [Kg · H 2 O / Kg · dry air] and the relative humidity is As 36, very dry.
    [69] Therefore, when the mixed gas in such a state is discharged through the stack 15, the white smoke phenomenon is not fundamentally lower than the relative humidity of the general atmosphere. As a result of the actual model test, white smoke was not generated at the outlet of the stack 15 of FIG. 2 and the superiority of the present invention was confirmed.
    [70] In Fig. 2, the doubling gas concentration measuring instrument 10 is installed to meet the measuring instrument installation criteria according to the Atmospheric Environment Conservation Act, and a duct 9 containing trace pollutants and an introduction duct 19 for introducing cooling air are provided. The heat exchanger (8) is installed in accordance with the mandatory provisions of the Environmental Conservation Act so that it can be determined by measurement that they are not mixed with each other.
    [71] In addition, as a result of the model test conducted to prove the effectiveness of the present invention, the relationship between the white smoke removal effect and the required power according to the mixing ratio of humid exhaust gas and dry cooling external air is shown in Table 2.
    [72] Ratio of Exhaust Gas and Cooling Air Volume 1: 01: 11: 31: 51: 71: 9 Air volume for cooling (Sm 3 / hr)04631389231532414167 Temperature after mixing (℃)7366.563.362.261.661.3 Absolute Humidity (Kg-H 2 O / Kg-DA)0.33430.16660.08380.05660.04270.0346 Relative Humidity ()1007546332621 Required power ratio0.01.02.85.28.011.4 White smoke phenomenonmuchmuchhandfulnonenonenone <Test conditions> Exhaust gas volume: 463Sm 3 / hr, Exhaust gas temperature: 73 ℃, Cooling air temperature: 0 ℃ Power consumption ratio: Exhaust gas and cooling external air volume ratio of 1: 1 based on blower power based on 1.0 Containing rocking force (Kw) = ｛(Q × ΔP) / (6120 × η)｝ × α
    [73] As can be seen from the experimental results through Table 2, the relative humidity of the mixed gas is 46 when the mixing ratio (hereinafter, referred to as the mixing ratio) of the humid exhaust gas and the dry cooling external air is 1: 3, and the relative humidity is 46. This drastically decreased, and even when the amount of external air for cooling was increased, it was found that the decrease in relative humidity did not appear much.
    [74] In addition, as a result of measuring the required power of the blower 18 for supplying the cooling external air, the required power increased by 30 or more from the mixing ratio 1: 7 or more, but the effect of decreasing the relative humidity was slight. Keeping below 1: 7 is analyzed as the most desirable.
    [75] Therefore, the experimental results in the present invention can be seen that the most suitable ratio of 1: 2.5 to 7.0 mixing ratio of the exhaust gas and the cooling external air in consideration of the efficiency and economical efficiency of the white smoke removal.
    [76] In the present invention, in order to reduce the required power ratio of the blower 18 in order to increase the white smoke removal effect in the same mixing ratio as in the case of operating in a state where the mixing ratio of the exhaust gas and the external air for cooling is less, the stack (15) By increasing the flow rate of the mixed gas discharged from the inside, the mixed gas can be easily diffused into the atmosphere, and the effect can be enhanced.
    [77] Focusing on this, the results of analyzing the relationship between the mixed gas flow rate and the diffusion effect in the stack 15 are shown in Table 3 below.
    [78] Mixed exhaust gas flow rate in the stack (m / sec) 10152025303540 Pressure loss (mmH 2 O)2.35.29.213.419.224.832.7 Required power ratio0.250.571.001.462.092.703.55 White smoke formation state (m)2.51.20.50.00.00.00.0 <Test conditions> Stack inside diameter: φ160 (mm), stack material: SUS 304 plate, stack length: 2m stack and main body reduction angle: 30 ° Required force ratio: flow rate 20m / sec 1.0 Length of white lead produced in m
    [79] Experimental results of Table 3 is because the mixing ratio of white lead is observed from the results of the experiment of Table 2 from 1: 3, the analysis test of the diffusion effect of the stack at the mixing ratio of 1: 3 (15 Flow rate was tested in the range of 10 to 40 m / sec, and in this condition, when the flow rate of the mixed exhaust gas in the stack was less than 20 m / sec, a small amount of white smoke was produced. This was not generated.
    [80] The increase in the required power ratio due to the increase in the flow rate in the stack was found to be large from the flow rate of 35m / sec or more. Therefore, the economic efficiency considering the required power increase compared to the diffusion effect was found to be less than 35m / sec.
    [81] Therefore, the exhaust gas flow rate in the stack 15 can increase the diffusion effect while maintaining a high speed of 19 to 32m / sec by the power of the blower 18 for supplying the cooling external air.
    [82] As described above, in order to overcome the limitations of the conventional method, the exhaust gas of the wet precipitator is discharged from the outside without being discharged into the atmosphere by using an indirect forced air cooling heat exchange method. By passing it to the heat exchange fin tube (or shell) side, the cooled humid exhaust gas and the blower are introduced into the heat exchanger for cooling, and the external air warmed and dried by the fin tube of the heat exchanger is installed before the stack. By mixing in a mixer to be discharged to the mixed gas of the dry state to the atmosphere.
    [83] When the humidified exhaust gas and the dry cooling external air are mixed in the mixer (Mixing Chamber), the mixed gas is discharged to the atmosphere through the stack due to the humidity is reduced to the relative humidity of the general atmosphere by a large amount of external air for cooling Re-condensation minimizes the phenomenon of white lead, and uses the power of an external cooling air supply blower to achieve higher efficiency, and increases the discharge rate of mixed gas from stacks by more than twice the existing rate. You can make this possible.
    [84] In addition, the greatest advantage of the present invention is to convert the exhaust gas into the mixed gas in the dry state, and to increase the discharge rate of the stack, the exhaust gas condensed around the stack can suppress the phenomenon of white smoke in the form of water vapor fall, It is possible to fundamentally prevent the pollution problem in the surroundings, and the device structure is simple, which can greatly reduce the cost.
    [85] In addition, compared with the conventional exhaust gas reheating method and the like, which can have an effect similar to the present invention, it is unnecessary to supply a fuel required for heating, thereby greatly reducing the required cost.
    [86] According to the present invention as described above, by recycling the dry outside air for cooling and mixing with the humid exhaust gas, by utilizing the energy of the cooling air inlet blower to increase the diffusion flow rate of the mixed gas in the stack, mainly at room temperature In the facilities that discharge exhaust gas at a higher level, it is possible to fundamentally suppress or treat the white smoke generated by saturated water in a high efficiency, so that wet air pollution of incinerators, desulfurization facilities, non-ferrous metal melting furnaces, chemical manufacturing facilities, etc. It can effectively remove white smoke generated during material removal process and water vapor generated in various industrial drying facilities.
    [87] In addition, it eliminates a large amount of heating fuel consumption and complicated equipment required for removing white smoke in the conventional method, and it is possible to remove white lead with stable and high efficiency by simple device and energy recycling. That is, there is an effect that greatly reduces condensate drops and fallout of pollutants near the stack.
    权利要求:
    Claims (5)
    [1" claim-type="Currently amended] In the method for removing the white smoke generated by the moisture contained in the exhaust gas,
    And removing the white smoke by lowering the humidity of the mixed exhaust gas by mixing the external air used for cooling with the exhaust gas by installing a mixer in series with the heat exchanger to communicate with the stack.
    [2" claim-type="Currently amended] The method of claim 1,
    The step,
    External air inflow step of forcibly introducing external air for cooling as a blower into the main body where a heat exchanger into which exhaust gas flows is introduced:
    A primary heat exchange step of cooling the exhaust gas passing through the inside of the heat exchanger as cooling external air passing through the outside of the heat exchanger, and heating and drying the outside air; and
    And a second heat exchange step in which the heated external air is heat-exchanged with each other so that there is no temperature difference while completely mixing in the exhaust gas and the mixer injected through the nozzle installed at the outlet end of the connection duct. .
    [3" claim-type="Currently amended] The method of claim 2,
    And exhaust gas and cooling external air are mixed in the mixer in a ratio of 1: 2.5 to 7 so as to lower the humidity of the mixed gas.
    [4" claim-type="Currently amended] The method of claim 2,
    The mixed gas is discharged at the speed of 19 to 32 m / sec in the stack (15) to obtain a diffusion effect by using the power of the blower.
    [5" claim-type="Currently amended] In the device for removing the white smoke discharged from the stack due to the moisture contained in the exhaust gas,
    A heat exchanger which cools the contaminants by removing the incoming exhaust gas into the heat exchange fin tube 8b;
    A connection duct communicating with an outlet end of the heat exchanger to guide exhaust gas passing through the heat exchanger to an upper portion of the heat exchanger; and
    And a mixer in which the exhaust gas injected through the nozzle formed at the outlet end of the connection duct and the external air heated and dried after passing through the heat exchanger are mixed with each other.
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    同族专利:
    公开号 | 公开日
    KR100375555B1|2003-03-10|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2000-04-11|Application filed by 김병우
    2000-04-11|Priority to KR20000018841A
    2001-11-14|Publication of KR20010100291A
    2003-03-10|Application granted
    2003-03-10|Publication of KR100375555B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR20000018841A|KR100375555B1|2000-04-11|2000-04-11|method and apparatus to remove white smoke|
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