An automobile engine detection exhaust gas treatment system

Abstract

The present application discloses an automobile engine detection exhaust gas treatment system, which relates to the field of detection exhaust gas treatment. The automobile engine detection exhaust gas treatment system provided by the present application is used to filter and purify the detection exhaust gas, including a primary filter, a spray tower, a demister and an activated carbon box connected in sequence through pipelines. A filter cotton is provided in the primary filter cavity, and the filter cotton is used to filter particulate pollutants. A spray head is provided in the spray tower cavity, and the spray head is used to spray circulating cooling water and cool the detection exhaust gas. A capture net and a filler are provided in the demister cavity, and the capture net and the filler are both used to capture the mist generated by the spray tower. An activated carbon layer is provided in the activated carbon box cavity, and the activated carbon layer is used to adsorb non-methane total hydrocarbons in the detection exhaust gas. The present application can effectively reduce the external exhaust temperature and the content of non-methane total hydrocarbons of the engine detection exhaust gas, meet the requirements of standard emissions, and has the advantages of low power consumption, low operating cost, and simple operation and management.

Description

Technical Field

[0001] The utility model relates to the field of waste gas detection treatment, in particular to a vehicle engine waste gas detection treatment system. Background Art

[0002] Before a car leaves the factory, it is necessary to test and analyze the exhaust gas at idle speed of the car engine, mainly to measure whether the content of various pollutants discharged by the car meets the national pollutant emission standards. This test is mainly carried out in the laboratory, and a certain amount of CO, NO x And non-methane total hydrocarbon waste gas. Then, how to deal with these waste gases has always been a difficult problem. If conventional treatment processes and procedures are used, the initial investment cost is too large and the later returns are less. Therefore, at present, most laboratories usually collect the waste gas and directly discharge it into the air, which not only does not meet the current environmental protection requirements, but is also bound to cause atmospheric pollution.

[0003] Therefore, there is an urgent need for an automobile engine exhaust gas treatment system that can effectively reduce the exhaust temperature and non-methane total hydrocarbon content of the engine exhaust gas, meet the requirements of standard emissions, and has the advantages of low power consumption, low operating cost, and simple operation and management. Utility Model Content

[0004] The purpose of the utility model is to provide a system for treating automobile engine exhaust gas detection in view of the deficiencies in the prior art, which effectively solves the problems of automobile engine exhaust gas detection being difficult to treat and having complicated treatment processes and procedures.

[0005] An automobile engine detection exhaust gas treatment system is used to filter and purify the detection exhaust gas, including a primary filter unit, a spray tower, a demister and an activated carbon box connected in sequence through pipelines. A filter cotton is arranged in the cavity of the primary filter unit, and the filter cotton is used to filter particulate pollutants. A spray head is arranged in the cavity of the spray tower, and the spray head is used to spray circulating cooling water and cool the detection exhaust gas. A capture net and a filler are arranged in the demister cavity, and the capture net and the filler are both used to filter the mist generated by the spray tower. An activated carbon layer is arranged in the cavity of the activated carbon box, and the activated carbon is used to adsorb non-methane total hydrocarbons in the detection exhaust gas.

[0006] In a feasible implementation, the primary filter unit includes a primary filter air inlet, a primary filter unit cavity and a primary filter air outlet which are sequentially connected and communicated, a filter frame is also provided in the primary filter cavity, and the filter cotton is folded and arranged in the filter frame. The primary filter air inlet is used to connect to the exhaust gas detection device, a fire damper is also provided in the pipe connecting the primary filter air inlet and the exhaust gas detection device, and the primary filter air outlet is connected to the spray tower.

[0007] In a feasible implementation, the primary filter air inlet and the primary filter air outlet are both bell-mouthed. The size of the primary filter air inlet gradually increases along the exhaust gas flow direction, and the size of the primary filter air outlet gradually decreases along the exhaust gas flow direction.

[0008] In some feasible implementations, the maximum temperature resistance of the fire damper is 130-180° C. and / or the porosity of the filter cotton is 3-8 μm and / or the filtration efficiency of the primary filter unit is 30-80%.

[0009] In a feasible implementation, the spray tower includes a spray tower air inlet and a spray tower air outlet, the spray tower air inlet is arranged at the bottom of the spray tower, and the spray tower air outlet is arranged at the top of the spray tower. The spray tower air inlet is connected to the primary filter unit, and the spray tower air outlet is connected to the demister.

[0010] In some feasible implementations, an upper spray layer and a lower spray layer are provided in the spray tower cavity, and the upper spray layer and the lower spray layer each include a plurality of the spray heads. And / or, the spray air-water ratio of the spray head is 10-15:1-3.

[0011] In a feasible embodiment, the demister includes a demister air inlet and a demister air outlet. The demister air inlet is arranged at the bottom of the demister, and the demister air outlet is arranged at the top of the demister. The demister air inlet is connected to the spray tower, and the demister is connected to the activated carbon box.

[0012] In some feasible embodiments, the material of the capture net is polypropylene. And / or, a packing ring is further provided in the demister cavity, the packing is provided in the packing ring, and the packing ring is a ball ring or a Raschig ring. And / or, the flow rate of the exhaust gas in the demister is 5 to 20 m / s.

[0013] In a feasible embodiment, the activated carbon box includes an activated carbon box air inlet and an activated carbon box air outlet, the activated carbon box air inlet and the activated carbon box air outlet are respectively arranged on both sides of the activated carbon box, the activated carbon box air inlet is connected to the demister, and the activated carbon box air outlet is exposed to the air and discharges the purified exhaust gas.

[0014] In some feasible embodiments, the empty tower flow rate of the activated carbon box is 0.6-0.8 m / s. And / or, the empty bed residence time of the activated carbon box is 2-6 s. And / or, the activated carbon box is a honeycomb activated carbon box or a granular activated carbon box. And / or, the activated carbon layer is a high iodine value honeycomb activated carbon or a high iodine value granular activated carbon.

[0015] The utility model has the following beneficial effects:

[0016] 1) The present application can effectively reduce the exhaust temperature and non-methane total hydrocarbon content of the engine exhaust gas, meet the requirements of standard emission, and has the advantages of low power consumption, low operating cost, and simple operation and management.

[0017] 2) The G4 filter cotton is folded and placed in the stainless steel frame of the primary filter unit, so that the primary filter unit has the advantages of small running resistance, high filtration load, precise structure and small footprint.

[0018] 3) The spray tower is equipped with a double-layer spray head. Under the condition of the same gas volume, the double-layer spray head can save 50% of the space compared with the single-layer spray head.

[0019] 4) Ball rings are used as packing rings in the demister cavity. Ball rings can increase the processing capacity by more than 50% at the same pressure drop, or reduce the pressure drop by 50% at the same processing capacity, and increase the mass transfer efficiency by 30%. It has the characteristics of large flux, small resistance, and high separation efficiency. It can reduce the packing volume in the demister by 30% and effectively reduce costs.

[0020] 5) The activated carbon box uses a honeycomb activated carbon box. The area occupied by the honeycomb activated carbon box is 1 / 2 of that of the granular activated carbon box, which can save more floor space to reduce the volume of the system. The activated carbon in the activated carbon box uses high iodine value honeycomb activated carbon. High iodine value honeycomb activated carbon has the characteristics of high porosity, large specific surface area, strong adsorption, small wind resistance and easy filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0022] Reference numerals

[0023] Primary filtration 1

[0024] Primary filter air inlet 11

[0025] Fire damper 11.1

[0026] Primary filter outlet 12

[0027] Filter frame 13

[0028] Spray Tower 2

[0029] Spray tower air inlet 21

[0030] Spray tower outlet 22

[0031] Demisting device 3

[0032] Demister air inlet 31

[0033] Demister air outlet 32

[0034] Activated carbon box 4

[0035] Activated carbon box air inlet 41

[0036] Activated carbon box outlet 42 DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "left side", "right side", "both sides", "cavity", "top", "bottom", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0040] The utility model provides a vehicle engine detection exhaust gas treatment system for filtering and purifying detection exhaust gas. Figure 1, including a primary filter unit 1, a spray tower 2, a demister 3 and an activated carbon box 4 connected in sequence by pipes, and the flow path of the exhaust gas is primary filter unit 1-> spray tower 2-> demister 3-> activated carbon box 4. Filter cotton is provided in the cavity of the primary filter unit 1, and the filter cotton is used to filter particulate pollutants. A spray head is provided in the cavity of the spray tower 2, and the spray head is used to spray circulating cooling water and cool the detected exhaust gas. A capture net and filler are provided in the cavity of the demister 3, and the capture net and filler are both used to filter the mist generated by the spray tower 2. An activated carbon layer is provided in the cavity of the activated carbon box 4, and the activated carbon layer is used to adsorb non-methane total hydrocarbons in the detected exhaust gas. Through the above-mentioned settings, the present application can effectively reduce the external exhaust temperature and the content of non-methane total hydrocarbons of the engine detection exhaust gas, meet the requirements of standard emissions, and has the advantages of low power consumption, low operating cost, and simple operation and management.

[0041] Furthermore, if Figure 1 As shown, the primary filter unit 1 includes a primary filter air inlet 11, a primary filter unit 1 cavity and a primary filter air outlet 12 which are connected and communicated in sequence. A filter frame 13 is also provided in the primary filter unit 1 cavity, and the filter cotton is folded and arranged in the filter frame 13. Specifically, the primary filter air inlet 11 and the primary filter air outlet 12 are respectively arranged on both sides of the primary filter unit 1 cavity. The primary filter air inlet 11 is used to access the exhaust gas detection device, and the primary filter air outlet 12 is connected to the spray tower 2. Preferably, the frame 13 is made of stainless steel, and the filter cotton is G4 filter cotton. The G4 filter cotton is arranged in the stainless steel frame 13 in a folded manner to increase the filtering area of ​​the G4 filter cotton, so that the particulate pollutants in the exhaust gas are effectively blocked between the folds generated by the folding of the G4 filter cotton, and the filtered exhaust gas can flow out evenly from one side of the G4 filter cotton. As a supplement, the porosity of the G4 filter cotton, that is, the filtration accuracy is 3 to 8 μm, preferably 5 μm, and the filtration efficiency of the primary filter unit 1 is 30 to 80%, preferably 50%. Through the above settings, the primary filter unit 1 has the advantages of low running resistance, high filtration load, precise structure and small footprint. In a specific embodiment, a fire damper 11.1 is also provided in the pipeline connecting the primary filter air inlet 11 and the exhaust gas detection device. The fire damper 11.1 can prevent high-temperature exhaust gas from catching fire in the pipeline and ensure the safety of the pipeline. As a supplement, the maximum temperature resistance of the fire damper 11.1 is 130 to 180°C, preferably 150°C. In an improved embodiment, the primary filter unit 1 is a cube structure, and the primary filter air inlet 11 and the primary filter air outlet 12 are both bell mouths. The size of the primary filter air inlet 11 gradually increases along the exhaust gas flow direction, and the size of the primary filter air outlet 12 gradually decreases along the exhaust gas flow direction. The arrangement of the bell mouth can effectively reduce the wind resistance of the primary filter unit 1 during operation, thereby reducing the operating energy consumption of the entire system.

[0042] Further, see Figure 1 The spray tower 2 includes a spray tower air inlet 21 and a spray tower air outlet 22. The spray tower air inlet 21 is arranged at the bottom of the spray tower 2, and the spray tower air outlet 22 is arranged at the top of the spray tower 2. The spray tower air inlet 21 is connected to the primary filter unit 1, and the spray tower air outlet 22 is connected to the demister 3. In a specific embodiment, the spray tower 2 is a cylindrical structure, and an upper spray layer and a lower spray layer are arranged in the cavity of the spray tower 2. The upper spray layer and the lower spray layer both include multiple spray heads. Under the condition of the same gas volume, the setting of the double-layer spray head can save 50% of the space compared with the setting of the single-layer spray head. In addition, the spray gas-water ratio of the spray head is 10-15:1-3, preferably 15:1, and the spray gas-water ratio is the ratio of the instantaneous flow rate of the treated exhaust gas to the instantaneous flow rate of the circulating cooling water.

[0043] Further, see Figure 1 The demister 3 includes a demister air inlet 31 and a demister air outlet 32. The demister air inlet 31 is arranged at the bottom of the demister 3, and the demister air outlet 32 ​​is arranged at the top of the demister 3. The demister air inlet 31 is connected to the spray tower 2, and the demister 3 is connected to the activated carbon box 4. In addition, the material of the capture net is polypropylene, which can effectively filter the mist carried by the exhaust gas in the spray tower 2, and the polypropylene material is acid and alkali resistant and has a long service life. Furthermore, a packing ring is also provided in the cavity of the demister 3, and the packing is arranged in the packing ring. The packing ring is a ball ring or a Raschig ring, preferably a ball ring. Compared with the Raschig ring, the ball ring has a processing capacity of more than 50% higher at the same pressure drop, or the pressure drop can be reduced by 50% at the same processing capacity, and the mass transfer efficiency is improved by 30%. It has the characteristics of large flux, small resistance, high separation efficiency, etc., and can reduce the packing volume in the demister 3 by 30%, effectively reducing the cost. In addition, the flow rate of the exhaust gas in the demister 3 can be limited to 5 to 20 m / s, preferably 7 m / s.

[0044] Further, see Figure 1, the activated carbon box 4 includes an activated carbon box air inlet 41 and an activated carbon box air outlet 42, which are respectively arranged on both sides of the activated carbon box 4, the activated carbon box air inlet 41 is connected to the demister 3, and the activated carbon box air outlet 42 is exposed to the air and discharges the purified exhaust gas. In addition, the empty tower flow rate of the activated carbon box 4 is 0.6-1m / s, preferably 0.8m / s. The empty tower flow rate refers to the air flow rate calculated according to the cross-sectional area of ​​the activated carbon box 4 when the activated carbon box 4 is in an unloaded state. If the empty tower flow rate is too large, the activated carbon box 4 needs to be enlarged, and the floor space and investment funds need to be increased; if the empty tower flow rate is too small, it may affect the exhaust gas purification effect. Here, the empty tower flow rate is preferably 0.8m / s, which is the most economical while ensuring a certain exhaust gas purification effect. The empty bed residence time of the activated carbon box 4 is 2 to 6 seconds, preferably 4 seconds. The empty bed residence time refers to the time when the activated carbon box 4 is in an unloaded state, and the gas stays in the activated carbon box 4, that is, the reaction time of the exhaust gas and the activated carbon. If the residence time is too long, the loading amount of the activated carbon and the investment funds need to be increased; if the residence time is too short, the reaction time of the exhaust gas and the activated carbon will be shortened, which will affect the purification efficiency of the activated carbon on the exhaust gas. The residence time here is preferably 4 seconds, which is the most economical while ensuring a certain purification effect. The activated carbon box 4 is a honeycomb activated carbon box or a granular activated carbon box, preferably a honeycomb activated carbon box. The area occupied by the honeycomb activated carbon box is 1 / 2 of the area occupied by the granular activated carbon box. Compared with the granular activated carbon box, it can save more floor space to reduce the volume of the system. The activated carbon is a high iodine value honeycomb activated carbon or a high iodine value granular activated carbon, preferably a high iodine value honeycomb activated carbon. Compared with the high iodine value granular activated carbon, the high iodine value honeycomb activated carbon has the characteristics of high porosity, large specific surface area, strong adsorption, small wind resistance and convenient loading.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An automobile engine exhaust gas treatment system for filtering and purifying exhaust gas, characterized in that: It comprises a primary filtering unit (1), a spray tower (2), a demister (3) and an activated carbon box (4) which are sequentially connected via pipelines; The cavity of the primary filter unit (1) is provided with filter cotton, and the filter cotton is used to filter particulate pollutants; The spray tower (2) is provided with a spray head in the cavity, and the spray head is used to spray circulating cooling water and cool the detected exhaust gas; A capture net and a filler are provided in the cavity of the demister (3), and the capture net and the filler are used to filter the mist generated by the spray tower (2); An activated carbon layer is provided in the cavity of the activated carbon box (4), and the activated carbon layer is used for adsorbing and detecting non-methane total hydrocarbons in the exhaust gas.

2. The automobile engine detection exhaust gas treatment system according to claim 1, characterized in that: The primary filter unit (1) comprises a primary filter air inlet (11), a primary filter unit (1) cavity and a primary filter air outlet (12) which are sequentially connected and communicated with each other; a filter frame (13) is provided in the primary filter unit (1) cavity; and the filter cotton is folded and arranged in the filter frame (13); The primary filter air inlet (11) is used to connect to the exhaust gas detection device, and a fire damper (11.1) is also provided in the pipeline connecting the primary filter air inlet (11) and the exhaust gas detection device, and the primary filter air outlet (12) is connected to the spray tower (2).

3. The automobile engine detection exhaust gas treatment system according to claim 2, characterized in that: The primary filter air inlet (11) and the primary filter air outlet (12) are both bell-shaped; the size of the primary filter air inlet (11) gradually increases along the flow direction of the exhaust gas, and the size of the primary filter air outlet (12) gradually decreases along the flow direction of the exhaust gas.

4. The automobile engine exhaust gas treatment system according to claim 2, characterized in that: The porosity of the filter cotton is 3-8 μm.

5. The automobile engine detection exhaust gas treatment system according to claim 1, characterized in that: The spray tower (2) comprises a spray tower air inlet (21) and a spray tower air outlet (22); the spray tower air inlet (21) is arranged at the bottom of the spray tower (2), and the spray tower air outlet (22) is arranged at the top of the spray tower (2); the spray tower air inlet (21) is connected to the primary filter unit (1), and the spray tower air outlet (22) is connected to the demister (3).

6. The automobile engine exhaust gas treatment system according to claim 5, characterized in that: An upper spray layer and a lower spray layer are provided in the cavity of the spray tower (2), and both the upper spray layer and the lower spray layer include a plurality of spray heads.

7. The automobile engine detection exhaust gas treatment system according to claim 1, characterized in that: The demister (3) comprises a demister air inlet (31) and a demister air outlet (32), wherein the demister air inlet (31) is arranged at the bottom of the demister (3), and the demister air outlet (32) is arranged at the top of the demister (3), the demister air inlet (31) is connected to the spray tower (2), and the demister (3) is connected to the activated carbon box (4).

8. The automobile engine exhaust gas treatment system according to claim 7, characterized in that: The material of the capture net is polypropylene; and / or, a packing ring is further provided in the cavity of the demister (3), the packing is arranged in the packing ring, and the packing ring is a ball ring or a Raschig ring.

9. The automobile engine exhaust gas treatment system according to claim 1, characterized in that: The activated carbon box (4) comprises an activated carbon box air inlet (41) and an activated carbon box air outlet (42), wherein the activated carbon box air inlet (41) and the activated carbon box air outlet (42) are respectively arranged on both sides of the activated carbon box (4), the activated carbon box air inlet (41) is connected to the demister (3), and the activated carbon box air outlet (42) is exposed to the air and discharges the purified exhaust gas.

10. The automobile engine exhaust gas treatment system according to claim 9, characterized in that: The activated carbon box (4) is a honeycomb activated carbon box or a granular activated carbon box; and / or the activated carbon layer is honeycomb activated carbon or granular activated carbon.

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