Waste gas purification system

Abstract

The utility model discloses a waste gas purification system, which relates to the technical field of waste gas purification and comprises a mixing header pipe, a filter, a first concentration rotating wheel, a first heating mechanism and an exhaust device. The filter is connected with the mixing header pipe and used for filtering particles in waste gas; an adsorption medium is arranged in the first concentration rotating wheel, the adsorption medium rotates in the first concentration rotating wheel, the rotation position of the adsorption medium comprises a first adsorption part, a first desorption part and a first cooling part, and the first adsorption part and the first cooling part are connected with a filter; the first heating mechanism is connected with the first cooling part and the first desorption part and is used for heating the waste gas discharged by the first cooling part and discharging the heated waste gas into the first desorption part. After the first adsorption part absorbs harmful substances, a small part of waste gas enters the first desorption part after being heated, the harmful substances can be desorbed from an adsorption medium at a relatively high temperature, and high-temperature gas heats the adsorption medium and absorbs, gathers and desorbs the harmful substances, so that the purpose of concentration is achieved.

Description

Technical Field

[0001] The present application relates to exhaust gas purification, and in particular to an exhaust gas purification system. Background Art

[0002] The electronics industry will emit a large amount of low-concentration organic waste gas during the production processes such as solder paste printing, dispensing, reflow soldering, and wave soldering. The waste gas contains a small amount of oil smoke and dust. If it is not treated, it will cause environmental pollution. For this type of waste gas, the current mainstream method on the market is to use a combination of activated carbon adsorption-catalytic combustion or zeolite wheel adsorption-RTO for treatment. The former activated carbon adsorption process has unstable purification effect, and it is difficult to replace the activated carbon, the replacement frequency is high, the operating cost is high, and there is a possibility of causing new environmental pollution. The latter RTO equipment has a high combustion temperature, consumes a lot of natural gas, and has high operating costs.

[0003] Utility model patent announcement number CN219252157U discloses an adsorption concentration rotor for treating low-boiling organic waste gas, which belongs to the field of organic waste gas treatment. The adsorption concentration rotor includes a shell, an axis and a rotor fan-shaped module located in the shell, wherein the shell and the rotor fan-shaped module are mechanically driven by a transmission belt to rotate around the axis, and the side of the rotor fan-shaped module is covered by the shell, and the rotor fan-shaped module includes a finned heat exchanger. The integration of the rotor and the heat exchanger can achieve synchronous adsorption, desorption and cooling in different regions, which can meet the requirements of continuous, stable and efficient adsorption and concentration of low-boiling organic waste gas, and occupies a small area; for different working conditions, the adsorption and concentration performance of the rotor can be improved by optimizing the rotor speed, increasing the desorption temperature, lowering the water temperature, and increasing the amount of cold water, and the operation is simple and safe. However, during the concentration process, the concentration rotor needs to be connected to different gases at the same time to achieve the purpose of concentration, which makes the operation cumbersome. Summary of the invention

[0004] In order to solve the problem of cumbersome gas connection of the concentration wheel, the present application provides an exhaust gas purification system.

[0005] The exhaust gas purification system provided in this application adopts the following technical solution:

[0006] An exhaust gas purification system comprises:

[0007] A mixing header for mixing exhaust gases;

[0008] A filter connected to the mixing main pipe for filtering particles in the exhaust gas;

[0009] A first concentrating rotor is provided with an adsorption medium therein, the adsorption medium rotates in the first concentrating rotor, the rotation position of the adsorption medium includes a first adsorption part, a first desorption part and a first cooling part, and the first adsorption part and the first cooling part are connected to a filter;

[0010] a first heating mechanism, connected to the first cooling part and the first desorption part, for heating the exhaust gas discharged from the first cooling part and discharging the heated exhaust gas into the first desorption part;

[0011] The exhaust device is connected to the first adsorption part and is used to discharge the clean gas after the exhaust gas is adsorbed.

[0012] By adopting the above technical solution, after the filter removes the particles in the exhaust gas, it is divided into two streams and enters the first concentration rotor. The adsorption medium in the first concentration rotor is in a rotating state, and the temperature of the adsorption medium in the first adsorption part is relatively low. The exhaust gas entering the first adsorption part is adsorbed with harmful substances by the adsorption medium and discharged from the exhaust device. After the exhaust gas passing through the first cooling part is heated by the first heating mechanism, it enters the first desorption part. Since harmful substances will desorb from the adsorption medium at a higher temperature, the high-temperature gas heats the adsorption medium and absorbs and aggregates the desorbed harmful substances, thereby achieving the purpose of concentration. After the adsorption medium increases the temperature in the first desorption part, it contacts the unheated exhaust gas in the cooling part, thereby cooling to a suitable adsorption temperature, and then re-enters the first adsorption part after desorption to absorb harmful substances in the exhaust gas again. Therefore, the exhaust gas entering the first adsorption part is purified, and the exhaust gas entering the first cooling part concentrates the harmful substances of the purified exhaust gas, thereby achieving the purpose of concentration.

[0013] Optionally, the purification system also includes:

[0014] A surface cooler connected to the first desorption part and used for cooling the desorbed gas;

[0015] A second concentrating rotor is provided with an adsorption medium inside, and the adsorption medium rotates inside the second concentrating rotor. The rotation position of the adsorption medium includes a second adsorption part, a second desorption part, and a second cooling part. The second adsorption part and the second cooling part are connected to a surface cooler, and the second adsorption part is connected to an exhaust device for discharging clean gas after adsorption.

[0016] The second heating mechanism is connected to the second cooling part and the second desorption part, and is used for heating the gas discharged from the second cooling part and discharging the heated gas into the second desorption part.

[0017] By adopting the above technical solution, since the temperature of the gas leaving the first desorption section is relatively high, it needs to be cooled before it can be adsorbed and concentrated in the second concentrating wheel. The operation mode of the second concentrating wheel and the second heating mechanism is the same as the operation mode of the first concentrating wheel and the first heating mechanism. The toxic substances in the gas entering the second adsorption section are concentrated into the gas entering the second cooling section through the second concentrating wheel, thereby achieving further concentration.

[0018] Optionally, the purification system further includes a ROC device, which is respectively connected to the second desorption section and the mixing main pipe, and is used for high-temperature purification of the concentrated gas generated by the second concentrator wheel, and reintroducing the purified gas into the mixing main pipe.

[0019] By adopting the above technical solution, the ROC (Regenerative Oxidative Catalyst) device is a highly efficient exhaust gas treatment device. The ROC device is used to catalytically decompose harmful substances in the gas discharged from the second desorption section. However, in order to efficiently catalyze and decompose harmful substances, the gas stays in the ROC device for a short time, and the decomposed gas still contains some harmful gases. Therefore, by re-adding it to the mixing main pipe and circulating it again, the purification efficiency of the purification system can be improved.

[0020] Optionally, the first heating mechanism includes a first desorption fan, an electric heater and a first control valve, the first desorption fan is respectively connected to the first cooling part and the first control valve, and the electric heater is respectively connected to the first control valve and the first desorption part.

[0021] By adopting the above technical scheme, the first adsorption fan can control the gas flow rate flowing through the first cooling part and the first desorption part, the first control valve can control the gas flow rate flowing through the first cooling part and the first desorption part, and the electric heater can control the air flow temperature, so that the first heating mechanism can control the desorption effect of the first concentrating turntable through the gas flow rate and the gas temperature, and can adjust the working state according to the actual gas concentration.

[0022] Optionally, the first heating mechanism further includes a first temperature control valve, which is connected to the first desorption fan and the first desorption part and is used to prevent the gas from passing through the electric heater so as to control the temperature of the gas entering the first desorption part.

[0023] By adopting the above technical solution, the first temperature control valve can prevent the gas from flowing through the electric heater, so that the gas passing through the electric heater and the gas not passing through the electric heater are mixed when entering the first desorption section. When the electric heater cannot accurately control the gas temperature, the first temperature control valve is used to accurately control the gas temperature entering the first desorption section.

[0024] Optionally, the second heating mechanism includes a second desorption fan, a heat exchanger and a second control valve. The second desorption fan is respectively connected to the second cooling part and the second control valve. The electric heater is respectively connected to the second control valve and the second desorption part. The heat exchanger is also connected to the ROC device and the surface cooler, and is used to exchange the heat of the gas in the ROC device to the gas entering the second desorption part.

[0025] By adopting the above technical solution, the operation mode of the second heating mechanism is similar to that of the first heating mechanism, the difference being that a heat exchanger is used instead of the electric heater. The heat exchanger can utilize the heat in the ROC device to heat the gas in the second heating mechanism, thereby realizing energy reuse, which is beneficial to improving the energy utilization rate of the purification system.

[0026] Optionally, the second heating mechanism further includes a second temperature control valve, which is connected to the second desorption fan and the second desorption part and is used to prevent the gas from passing through the heat exchanger to control the temperature of the gas entering the second desorption part.

[0027] By adopting the above technical solution, the second temperature control valve can prevent the gas from flowing through the heat exchanger, so that the gas passing through the heat exchanger and the gas not passing through the heat exchanger are mixed when entering the second desorption section. When the heat exchanger cannot accurately control the gas temperature, the second temperature control valve is used to accurately control the gas temperature entering the second desorption section.

[0028] Optionally, a flame arrester is further included, and the flame arrester is connected between the ROC device and the second desorption part.

[0029] By adopting the above technical solution, oxygen needs to be added to the ROC device for catalytic oxidation. Under high temperature, oxygen will produce flames, and the flame arrester can prevent the flames from entering the second concentrating rotor, thereby ensuring the normal operation of the second concentrating rotor.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. The exhaust gas passing through the first adsorption part is adsorbed and then discharged into the exhaust device. After the exhaust gas entering the first cooling part is cooled and rotated from the first desorption part to the first cooling medium of the first cooling part, it is heated by the first heating mechanism and then enters the first desorption part. Since the harmful substances will be desorbed from the adsorption medium at a higher temperature, the high-temperature gas heats the adsorption medium and absorbs and aggregates the desorbed harmful substances, thereby achieving the purpose of concentration;

[0032] 2. The gas in the ROC device partially enters the heat exchanger, thereby heating the gas entering the second desorption section. The heat exchanger can use the heat in the ROC device to heat the gas in the second heating mechanism, thereby realizing energy reuse, which is beneficial to improving the energy utilization rate of the purification system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0034] Figure 2 is a schematic diagram of the structure of the first concentrating rotor in an embodiment of the present application;

[0035] Figure 3It is a schematic diagram of the structure of the first concentrating rotor and the ROC heater in an embodiment of the present application.

[0036] Figure numerals: 1. mixing main pipe; 2. filter; 3. first concentrating rotor; 31. first adsorption section; 32. first desorption section; 33. first cooling section; 4. first heating mechanism; 41. first desorption fan; 42. electric heater; 43. first control valve; 44. first temperature control valve; 5. exhaust device; 51. first adsorption fan; 52. second adsorption fan; 6. surface cooler; 61. cooling tower; 62. circulating water pump; 7. second concentrating rotor; 71. second adsorption section; 72. second desorption section; 73. second cooling section; 8. second heating mechanism; 81. second desorption fan; 82. heat exchanger; 83. second control valve; 84. second temperature control valve; 85. heat extraction valve; 9. ROC equipment; 91. lifting valve; 92. heat storage layer; 93. catalytic layer; 94. ROC heater; 10. flame arrester. DETAILED DESCRIPTION

[0037] The present application is further described in detail below in conjunction with the accompanying drawings.

[0038] A gas purification system, referring to Figure 1 , including a mixing main pipe 1, a filter 2, a first concentrating rotor 3, a first heating mechanism 4, an exhaust device 5, a surface cooler 6, a second concentrating rotor 7, a second heating mechanism 8 and a ROC device 9. The mixing main pipe 1 is connected to the external exhaust gas source and the ROC device 9, so that the gas purified by the ROC device 9 re-enters the purification system circulation to remove the remaining small concentrations of harmful substances. The mixing main pipe 1 is connected to the filter 2, and the filter 2 includes three levels of coarse efficiency, medium efficiency and high efficiency filtration to filter the particulate matter in the exhaust gas. After the exhaust gas passes through the first filter 2, the size of the particulate matter in the exhaust gas can be controlled below 1μm, thereby avoiding the risk of particulate matter in the exhaust gas blocking the adsorption holes of the adsorption medium during the subsequent adsorption treatment of the concentrating rotor, which is conducive to the adsorption medium to maintain a high adsorption effect for a long time.

[0039] Reference Figure 2The filter 2 is connected to the first concentrating rotor 3 at two locations. A rotating adsorption medium is provided in the first concentrating rotor 3. The rotating position of the adsorption medium includes a first adsorption section 31, a first desorption section 32 and a first cooling section 33. The filter 2 is connected to the first adsorption section 31 and the first cooling section 33. The other side of the first adsorption section 31 is connected to a first adsorption fan 51, which is then connected to an exhaust device 5, so that the exhaust gas entering the first adsorption section 31 is discharged from the exhaust device 5 after being adsorbed, thereby adsorbing harmful substances in the exhaust gas into the adsorption medium of the first concentrating rotor 3. The first cooling part 33 is connected to the first heating mechanism 4, which includes a first desorption fan 41, an electric heater 42, a first control valve 43 and a first temperature control valve 44. The first desorption fan 41 is connected to the first cooling part 33, and the other end is connected to the first control valve 43 and the first temperature control valve 44 respectively. The first control valve 43 is connected to the electric heater 42. The gas connection of the electric heater 42 and the first temperature control valve 44 is combined and connected to the first desorption part 32, so that the exhaust gas can be heated by the electric heater 42 while passing through the first temperature control valve 44 without passing through the electric heater 42, thereby controlling the temperature of the gas entering the first desorption part 32. After the exhaust gas is heated to the specified temperature, the temperature of the adsorption medium is increased in the first desorption part 32, so that the harmful substances are desorbed into the exhaust gas in the first desorption part 32, so that the harmful substances in the exhaust gas entering the first adsorption part 31 are concentrated into the exhaust gas entering the first desorption part 32.

[0040] Reference Figure 3 After the gas leaves the first desorption section 32, it enters the surface cooler 6, which is connected to a cooling tower 61 and a circulating water pump 62. The circulating water pump 62 pumps the water flow in the cooling tower 61 into the surface cooler 6, thereby cooling the desorbed gas discharged from the first desorption section 32. The desorbed gas after cooling enters the second concentration rotor 7, in which an adsorption medium is arranged. The rotation position of the adsorption medium includes a second adsorption section 71, a second desorption section 72 and a second cooling section 73, wherein the second adsorption section 71 and the second cooling section 73 are connected to the surface cooler 6. The second adsorption section 71 is connected to a second adsorption fan 52, and is connected to an exhaust device 5, so that the gas entering the second adsorption section 71 is discharged from the purification system through the exhaust device 5 after being adsorbed.

[0041] The second cooling part 73 is connected to the second heating mechanism 8, and the second heating mechanism 8 includes a second desorption fan 81, a heat exchanger 82, a second control valve 83 and a second temperature control valve 84. The second desorption fan 81 is connected to the second cooling part 73, and the other end is connected to the second control valve 83 and the second temperature control valve 84 respectively. The second control valve 83 is connected to the heat exchanger 82. The gas connection of the heat exchanger 82 and the second temperature control valve 84 is combined and connected to the second desorption part 72, so that the gas can be heated by the heat exchanger 82 while passing through the second temperature control valve 84 without passing through the heat exchanger 82, thereby controlling the temperature of the gas entering the second desorption part 72. After the adsorption medium that absorbs harmful substances in the second adsorption part 71 rotates to the second desorption part 72, the high-temperature gas heated to a specified temperature increases the temperature of the adsorption medium in the second desorption part 72, so that the harmful substances are desorbed into the exhaust gas in the second desorption part 72, so that the harmful substances in the exhaust gas entering the second adsorption part 71 are concentrated into the exhaust gas entering the second desorption part 72. After the adsorption medium rotates from the second desorption section 72 to the second cooling section 73, it is cooled by the gas in the surface cooler 6 and thus restored to the adsorption temperature.

[0042] In addition, the heat exchanger 82 is respectively connected to the ROC device 9 and the surface cooler 6 to receive the high-temperature gas in the ROC device 9 to heat the gas in the second heating mechanism 8. A heat extraction valve 85 is provided between the heat exchanger 82 and the surface cooler 6. The heat extraction valve 85 can control the flow rate of the high-temperature gas obtained from the ROC device 9, thereby controlling the heat exchange effect of the heat exchanger 82.

[0043] Referring to the figure, after the gas is discharged from the second desorption section 72, it passes through the flame arrester 10 and enters the ROC device 9. Since the ROC device 9 will generate flames during the high-temperature catalytic decomposition process, the flame arrester 10 can prevent the flame from flowing back to the second concentration wheel 7, thereby protecting the normal operation of the purification system.

[0044] Reference Figure 3 The ROC device 9 includes a lift valve 91, a heat storage layer 92, a catalytic layer 93 and a ROC heater 94. The lift valve 91 is connected to the flame arrester 10 and the mixing main pipe 1 respectively, and is a device for gas to enter and exit the ROC device 9. The gas discharged from the ROC device 9 enters the mixing main pipe 1 for desorption again, which can ensure the quality of the gas discharged from the purification system. The lift valve 91 is connected to the heat storage layer 92. The heat storage layer 92 can store the heat of the gas discharged from the inside and is used to preheat the incoming gas, thereby improving the energy utilization rate of the ROC device 9. The catalytic layer 93 can reduce the temperature required for the decomposition of harmful substances, thereby reducing energy consumption and improving the decomposition efficiency. The ROC heater 94 is used to heat the gas entering the ROC device 9, so that the harmful substances are heated and decomposed.

[0045] The implementation principle of the embodiment of the present application is as follows: after the exhaust gas in the mixing manifold 1 is concentrated twice by the first concentrating rotor 3 and the second concentrating rotor 7, the gas discharged from the second desorption section 72 accumulates a large amount of harmful substances, and the gas discharged from the first adsorption section 31 and the second adsorption section 71 can be discharged from the purification system through the exhaust device 5 after adsorption. The gas concentrated with a large amount of harmful substances enters the ROC device 9 for high-temperature catalytic decomposition, thereby achieving efficient decomposition of harmful substances in low-concentration gas and improving purification efficiency.

[0046] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An exhaust gas purification system, characterized in that: include: A mixing manifold (1) for mixing exhaust gases; A filter (2) connected to the mixing main pipe (1) and used for filtering particles in the exhaust gas; a first concentration rotor (3) having an adsorption medium disposed therein, the adsorption medium rotating in the first concentration rotor (3), the rotational position of the adsorption medium comprising a first adsorption portion (31), a first desorption portion (32) and a first cooling portion (33), the first adsorption portion (31) and the first cooling portion (33) being connected to the filter (2); a first heating mechanism (4) connected to the first cooling section (33) and the first desorption section (32), and used for heating the exhaust gas discharged from the first cooling section (33), and discharging the heated exhaust gas into the first desorption section (32); An exhaust device (5) is connected to the first adsorption part (31) and is used to discharge clean gas after the exhaust gas has been adsorbed.

2. The exhaust gas purification system according to claim 1, characterized in that: Also includes: A surface cooler (6), connected to the first desorption section (32), used for cooling the desorbed gas; a second concentrating rotor (7) having an adsorption medium disposed therein, the adsorption medium rotating in the second concentrating rotor (7), the rotational position of the adsorption medium comprising a second adsorption portion (71), a second desorption portion (72) and a second cooling portion (73), the second adsorption portion (71) and the second cooling portion (73) being connected to the surface cooler (6), and the second adsorption portion (71) being connected to the exhaust device (5) for exhausting clean gas after adsorption; The second heating mechanism (8) is connected to the second cooling section (73) and the second desorption section (72), and is used to heat the gas discharged from the second cooling section (73) and discharge the heated gas into the second desorption section (72).

3. The exhaust gas purification system according to claim 2, characterized in that: It also includes a ROC device (9), which is connected to the second desorption section (72) and the mixing main pipe (1) respectively, and is used for high-temperature purification of concentrated gas generated by the second concentration wheel (7), and reintroducing the purified gas into the mixing main pipe (1).

4. The exhaust gas purification system according to claim 1, characterized in that: The first heating mechanism (4) comprises a first desorption fan (41), an electric heater (42) and a first control valve (43); the first desorption fan (41) is respectively connected to the first cooling part (33) and the first control valve (43); the electric heater (42) is respectively connected to the first control valve (43) and the first desorption part (32).

5. The exhaust gas purification system according to claim 4, characterized in that: The first heating mechanism (4) further comprises a first temperature control valve (44), wherein the first temperature control valve (44) is connected to the first desorption fan (41) and the first desorption section (32) and is used to prevent the gas from passing through the electric heater (42) so as to control the temperature of the gas entering the first desorption section (32).

6. The exhaust gas purification system according to claim 3, characterized in that: The second heating mechanism (8) comprises a second desorption fan (81), a heat exchanger (82) and a second control valve (83); the second desorption fan (81) is respectively connected to the second cooling section (73) and the second control valve (83); the heat exchanger (82) is respectively connected to the second control valve (83) and the second desorption section (72); the heat exchanger (82) is also connected to the ROC device (9) and the surface cooler (6) and is used to transfer heat from the gas in the ROC device (9) to the gas entering the second desorption section (72).

7. The exhaust gas purification system according to claim 6, characterized in that: The second heating mechanism (8) further comprises a second temperature control valve (84), wherein the second temperature control valve (84) is connected to the second desorption fan (81) and the second desorption section (72) and is used to prevent the gas from passing through the heat exchanger (82) so as to control the temperature of the gas entering the second desorption section (72).

8. The exhaust gas purification system according to claim 3, characterized in that: It also includes a flame arrester (10), which is connected between the ROC device (9) and the second desorption section (72).

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