Engine exhaust purification device

Abstract

The present invention relates to the field of exhaust gas treatment technology, and specifically to an engine exhaust gas purification device, comprising a smoke inlet pipe, an oil-gas separator, a back-blowing purification device, a mixing pipe, a soot blower, an induced draft fan, an exhaust pipe and a bypass pipe, wherein the smoke inlet pipe is connected to the oil-gas separator, the back-blowing purification device is connected to the oil-gas separator, one end of the mixing pipe is connected to the back-blowing purification device, the other end of the mixing pipe is connected to the soot blower, the outlet end of the soot blower is connected to the induced draft fan, the exhaust pipe is arranged at the outlet end of the induced draft fan, one end of the bypass pipe is connected to the smoke inlet pipe, and the other end of the bypass pipe is connected to the induced draft fan. The present invention performs oil-gas separation treatment on engine exhaust gas through the oil-gas separator, and after treatment, the exhaust gas enters the back-blowing purification device to filter gas impurities in the exhaust gas, and then the exhaust gas enters the soot blower through the mixing pipe to reduce NOx in the exhaust gas to nitrogen and water vapor, and is finally discharged through the exhaust pipe, thereby achieving exhaust gas purification treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas treatment, and in particular to an engine tail gas purification treatment device. Background Art

[0002] Mainstream diesel engine aftertreatment systems include the DOC (diesel oxidation catalyst), DPF (diesel particulate filter), and SCR (selective catalytic reduction). The DPF traps particulate matter and then burns the trapped carbon particles through regeneration. The SCR system, an effective method for reducing NOx emissions from diesel engines, uses ammonia as a reducing agent, reducing NOx in exhaust gas to nitrogen and water vapor over the action of a catalyst.

[0003] At present, diesel engine exhaust emissions are often treated with a particulate filter (DPF) to reduce diesel engine pollutant emissions. DPF can effectively capture particulate matter, however, due to the water-cooling method used in diesel engines, the combustion efficiency of diesel engines is low, and particulate matter emissions are high. Particulate matter emissions exceed the DPF's self-regeneration speed, which can easily cause DPF clogging and generate greater resistance during the purification process, directly affecting the engine's power, causing the diesel engine's back pressure to increase and stall. Therefore, the metal filter element needs to be cleaned or replaced regularly to achieve long-term system maintenance time. This equipment greatly increases maintenance costs, while also reducing the efficiency of exhaust purification, reducing practicality and convenience, and does not meet the needs of long-term development. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide an engine exhaust purification treatment device, which can first perform oil and gas separation treatment on the engine exhaust by setting an oil and gas separator. The treated exhaust gas enters the back-blowing purification device, which can intercept and filter the gas impurities in the exhaust gas and deposit the carbon deposits in the back-blowing purification device. The treated exhaust gas enters the soot blowing device through the mixing pipe to reduce the NOx in the exhaust gas into nitrogen and water vapor. Finally, the treated exhaust gas is sent into the exhaust pipe by the induced draft fan for discharge, which can realize the purification treatment of the exhaust gas and effectively achieve energy saving and environmental protection. When the back pressure sensor of the mixing pipe detects that the pressure at the inlet of the mixing pipe is too high, the control valve connects the bypass pipe with the induced draft fan, so that part of the exhaust gas enters the bypass pipe, and is diverted to the induced draft fan through the bypass pipe for discharge, thereby maintaining the exhaust of the soot blowing device unobstructed, preventing the engine from stalling due to increased back pressure, and ensuring the safety of engine use.

[0005] and a tube connecting the discharging opening of the gas outlet to the fuel pump, the tube connecting the discharging opening of the gas outlet to the fuel pump, and the tube connecting the discharging opening of the gas outlet to the fuel pump.

[0006] Preferably, the backflush purification device includes a backflush chamber, a purification chamber, an air inlet assembly and an air outlet assembly, one end of the air inlet assembly is connected to the purification chamber, the backflush chamber is arranged on one side of the purification chamber and is connected to the purification chamber, and one end of the air outlet assembly is connected to the purification chamber.

[0007] Preferably, the back-blowing chamber includes a confluence chamber, several venturis, several large and small heads, several compensation pipes, several joints, several pulse valves, a vent pipe and an air storage tank. The confluence chamber is arranged on the side wall of the purification chamber, the venturis are arranged in the confluence chamber, and one end of the venturis extends into the purification chamber, one end of the large and small heads is arranged on the side wall of the confluence chamber and is connected with the confluence chamber, and the large and small heads are arranged opposite to the corresponding venturis, one end of the compensation pipe is connected with the other end of the large and small heads, one end of the joint is connected with the other end of the compensation pipe, the pulse valve is connected with the other end of the joint, one end of the vent pipe is connected to the air storage tank, the other end of the vent pipe is connected with the corresponding pulse valves, and the inlet end of the confluence chamber is connected with the oil-gas separator.

[0008] Preferably, the purification chamber includes a filter box body, a plurality of filter elements, a plurality of partitions, a plurality of funnels and a plurality of carbon deposit barrels. The side wall of the filter box body is provided with a plurality of installation ports. The filter element insertion installation port is arranged in the filter box body, and the other end of the filter element extends out of the other side wall of the filter box body. Adjacent rows of filter elements in the filter box body are separated by partitions. The funnel is arranged on the lower end surface of the filter box body and is connected to the filter box body, and the funnels are respectively located below the corresponding filter elements. The carbon deposit barrels are respectively installed at the outlet ends of the funnels, the air inlet assembly is connected to the inlet end of the filter box body, and the air outlet assembly is connected to the outlet end of the filter box body.

[0009] Preferably, the sootblowing device includes a collection box, a sootblowing mechanism and an adsorption mechanism, the sootblowing mechanism is provided with a nozzle, the side wall of the collection box is provided with a mounting hole, the sootblowing mechanism is mounted in the collection box through the mounting hole, the adsorption mechanism is arranged in the collection box and is located on one side of the sootblowing mechanism, the adsorption mechanism is arranged parallel to the sootblowing mechanism, and the opening of the nozzle faces the adsorption mechanism, one end of the collection box is connected to the mixing pipe, and one end of the collection box is connected to the induced draft fan.

[0010] Preferably, the oil-gas separator includes a conical separation tube, a cyclone and a collecting tube, the cyclone is arranged at the contracted end of the conical separation tube, the expanded end of the conical separation tube is provided with a separation spacer tube extending into the conical separation tube, a separation groove is formed between the separation spacer tube and the conical separation tube, the collecting tube is arranged at the expanded end of the conical separation tube and is connected to the separation groove, the contracted end of the conical separation tube is connected to the smoke inlet pipe, and the expanded end of the conical separation tube is connected to the air intake assembly.

[0011] Preferably, the mixing tube is provided with a back pressure sensor, a spray gun, a nitrogen oxide sensor, a flow base and a first control valve. The first control valve is arranged at one end close to the backflush purification device, the flow base is located on one side of the first control valve, the nitrogen oxide sensor is located on one side of the flow base, the spray gun is located on one side of the nitrogen oxide sensor, and the back pressure sensor is located on one side of the spray gun.

[0012] Preferably, a branch pipe is provided between the mixing pipe and the bypass pipe, and the branch pipe is provided with a second control valve.

[0013] Preferably, the bypass pipe is provided with a third control valve.

[0014] Preferably, a fourth control valve is provided at the connection between the purification chamber and the air intake assembly.

[0015] The beneficial effects of the present invention are as follows: the exhaust gas purification treatment device of the present invention can first perform oil and gas separation treatment on the engine exhaust gas by setting an oil and gas separator; the treated exhaust gas enters the back-blowing purification device to intercept and filter the gas impurities in the exhaust gas and deposit the carbon deposits in the back-blowing purification device; the treated exhaust gas enters the soot blowing device through the mixing pipe to reduce the NOx in the exhaust gas into nitrogen and water vapor; finally, the treated exhaust gas is sent into the exhaust pipe by the induced draft fan for discharge, thereby achieving purification treatment of the exhaust gas and effectively achieving energy conservation and environmental protection; when the back pressure sensor of the mixing pipe detects that the pressure at the inlet of the mixing pipe is too high, the second control valve or the third control valve is controlled to connect the bypass pipe with the induced draft fan, so that part of the exhaust gas enters the bypass pipe, and is diverted to the induced draft fan through the bypass pipe for discharge, thereby maintaining unobstructed exhaust of the soot blowing device, preventing the engine from stalling due to increased back pressure, and ensuring the safety of engine use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a perspective view of the present invention;

[0017] Figure 2 It is a three-dimensional diagram from another perspective of the present invention;

[0018] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 is a perspective view of the backflush purification device of the present invention;

[0020] Figure 5 yes Figure 4 A three-dimensional image of the backflush purification device from another perspective;

[0021] Figure 6 yes Figure 5 Cross-sectional view of the backflush purification device;

[0022] Figure 7 yes Figure 4 Exploded diagram of the backflush purification device;

[0023] Figure 8 is a perspective view of the oil-gas separator of the present invention;

[0024] Figure 9 yes Figure 8 Schematic diagram of the oil-gas separator.

[0025] The accompanying drawings are marked as follows: 1-smoke inlet pipe, 2-oil and gas separator, 21-conical separation pipe, 22-cyclone, 23-collection pipe, 24-separation barrier pipe, 25-separation tank, 3-backflush purification device, 31-backflush bin, 311-convergence bin, 312-Venturi, 313-reducer, 314-compensation pipe, 315-joint, 316-pulse valve, 317-vent pipe, 318-gas storage tank, 32-purification bin, 321-filter box, 322-filter element, 3 23-partition, 324-funnel, 325-carbon deposit barrel, 33-air inlet assembly, 34-air outlet assembly, 35-fourth control valve, 4-mixing pipe, 41-back pressure sensor, 42-spray gun, 43-nitrogen oxide sensor, 44-flow base, 45-first control valve, 5-soot blowing device, 51-capture box, 52-soot blowing mechanism, 53-adsorption mechanism, 6-induced draft fan, 7-exhaust pipe, 8-bypass pipe, 81-third control valve, 9-branch pipe and 10-second control valve. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of those skilled in the art, the following embodiments and accompanying drawings are provided. Figure 1-9The present invention is further described, and the contents mentioned in the embodiment are not intended to limit the present invention.

[0027] See Figure 1-9 , an engine exhaust gas purification device comprises a smoke inlet pipe 1, an oil-gas separator 2, a back-blowing purification device 3, a mixing pipe 4, a soot blowing device 5, an induced draft fan 6, an exhaust pipe 7 and a bypass pipe 8. The oil-gas separator 2 is provided with an inlet end and an outlet end, one end of the smoke inlet pipe 1 is communicated with the inlet end of the oil-gas separator 2, the back-blowing purification device 3 is provided with an inlet end and an outlet end, the inlet end of the back-blowing purification device 3 is communicated with the outlet end of the oil-gas separator 2, one end of the mixing pipe 4 is communicated with the outlet end of the back-blowing purification device 3, the soot blowing device 5 is provided with an inlet end and an outlet end, the other end of the mixing pipe 4 is connected with the inlet end of the soot blowing device 5, the induced draft fan 6 is provided with an inlet end and an outlet end, the outlet end of the soot blowing device 5 is communicated with the inlet end of the induced draft fan 6, the exhaust pipe 7 is provided at the outlet end of the induced draft fan 6, one end of the bypass pipe 8 is communicated with the smoke inlet pipe 1, and the other end of the bypass pipe 8 is communicated with the induced draft fan 6.

[0028] The exhaust gas purification treatment device in this embodiment is provided with an oil-gas separator 2, which can first perform oil-gas separation treatment on the engine exhaust gas. The treated exhaust gas enters the back-blowing purification device 3, which can intercept and filter the gas impurities in the exhaust gas and deposit the carbon deposits in the back-blowing purification device 3. The treated exhaust gas enters the soot blowing device 5 through the mixing pipe 4 to reduce the NOx in the exhaust gas into nitrogen and water vapor. Finally, the treated exhaust gas is sent to the exhaust pipe 7 by the induced draft fan 6 for discharge, which can achieve the purification treatment of the exhaust gas and effectively achieve energy saving and environmental protection. When the back pressure sensor 41 of the mixing pipe 4 detects that the pressure at the inlet of the mixing pipe 4 is too high, the second control valve 10 or the third control valve 81 is controlled to connect the bypass pipe 8 with the induced draft fan 6, so that part of the exhaust gas enters the bypass pipe 8 and is diverted to the induced draft fan 6 through the bypass pipe 8 for discharge, thereby maintaining the exhaust of the soot blowing device 5 unobstructed, preventing the engine from stalling due to increased back pressure, and ensuring the safety of engine use.

[0029] In this embodiment, the back-blowing purification device 3 includes a back-blowing chamber 31, a purification chamber 32, an air inlet assembly 33 and an air outlet assembly 34. One end of the air inlet assembly 33 is connected to the purification chamber 32. The back-blowing chamber 31 is arranged on one side of the purification chamber 32 and is connected to the purification chamber 32. One end of the air outlet assembly 34 is connected to the purification chamber 32.

[0030] The back-blowing purification device 3 in this embodiment adopts the above-mentioned structure. After the exhaust gas is separated by oil and gas in the oil-gas separator 2, it enters the purification chamber 32 through the air intake component 33. After the dust, carbon deposits and other impurities in the exhaust gas are filtered out by the purification chamber 32, it is discharged from the air outlet component 34 into the mixing pipe 4 and sent to the soot blowing device 5 for treatment. In order to ensure the treatment efficiency of the purification chamber 32, a back-blowing chamber 31 is added. When the gas impurities in the exhaust gas are intercepted by the filter element 322 in the purification chamber 32 and deposited too much on the surface of the filter element 322, the back-blowing air from the soot blowing chamber can be used to automatically blow off the carbon deposited particle impurities deposited on the surface of the filter element 322, thereby realizing the effect of automatic soot blowing purification, which can ensure that the exhaust gas purification treatment device has high flue gas purification treatment efficiency, reduce the use cost, and effectively solve the problems existing in the existing gas treatment device.

[0031] In this embodiment, the backflush chamber 31 includes a confluence chamber 311, a plurality of venturis 312, a plurality of reducers 313, a plurality of compensation pipes 314, a plurality of joints 315, a plurality of pulse valves 316, a vent pipe 317 and an air storage tank 318. The confluence chamber 311 is arranged on the side wall of the purification chamber 32, the venturis 312 are arranged in the confluence chamber 311, and one end of the venturis 312 extends into the purification chamber 32. One end of the reducer 313 is arranged on the side wall of the confluence chamber 311 and is connected to the confluence chamber 311. The two ends of the venturi 312 are connected, and the reducer and reducer 313 are arranged opposite to each other. One end of the compensation pipe 314 is connected to the other end of the reducer and reducer 313. One end of the joint 315 is connected to the other end of the compensation pipe 314. The pulse valve 316 is connected to the other end of the joint 315. One end of the vent pipe 317 is connected to the air tank 318. The other end of the vent pipe 317 is connected to the corresponding pulse valve 316. The inlet end of the confluence bin 311 is connected to the oil-gas separator 2.

[0032] The soot blowing bin in this embodiment adopts the above-mentioned structure. During reverse soot blowing, the system controls the pulse valve 316 to open, and the gas in the gas storage tank 318 flows out from the vent pipe 317 through the compensation pipe 314, the reducer and reducer 313 and the venturi 312 and then enters the confluence bin 311. The gas accumulated in the confluence bin 311 enters the corresponding filter element 322 due to the action of strong pressure. After the gas passes through the metal filter paper of the filter element 322 inside the filter element 322, the carbon deposits attached to the outer wall of the filter element 322 are blown off, thereby realizing the automatic soot blowing effect on the filter element 322, thereby improving the service life and purification and filtration effect of the filter element 322.

[0033] In this embodiment, the purification chamber 32 includes a filter box body 321, a plurality of filter elements 322, a plurality of partitions 323, a plurality of funnels 324 and a plurality of carbon deposit barrels 325. The side wall of the filter box body is provided with a plurality of mounting ports. The filter element 322 is inserted into the mounting port and is arranged in the filter box body, and the other end of the filter element 322 extends out of the other side wall of the filter box body. Adjacent rows of filter elements 322 in the filter box body are separated by partitions 323. The funnels 324 are arranged on the lower end surface of the filter box body 321 and are connected to the filter box body, and the funnels 324 are respectively located below the corresponding filter elements 322. The carbon deposit barrels 325 are respectively installed at the outlet ends of the funnels 324. The air inlet component 33 is connected to the inlet end of the filter box body, and the air outlet component 34 is connected to the outlet end of the filter box body.

[0034] In this embodiment, by arranging a partition 323 in the filter box 321, the filter box 321 can be divided into several compartments, and then the filter element 322 can be isolated in the longitudinal direction to achieve compartment division, and the funnel 324 is arranged below the corresponding filter element 322, so that the carbon deposits and dust separated by the soot blowing bin can be collected in the carbon deposit barrel 325 through the funnel 324. Regularly cleaning the carbon deposits in the carbon deposit barrel 325 can achieve long-term use of the purification device, thereby improving the working efficiency and purification effect of the gas treatment device.

[0035] In this embodiment, the soot blowing device 5 includes a collection box 51, a soot blowing mechanism 52 and an adsorption mechanism 53. The soot blowing mechanism 52 is provided with a nozzle. The side wall of the collection box 51 is provided with an installation hole. The soot blowing mechanism 52 is installed in the collection box 51 through the installation hole. The adsorption mechanism 53 is arranged in the collection box 51 and is located on one side of the soot blowing mechanism 52. The adsorption mechanism 53 is arranged parallel to the soot blowing mechanism 52, and the opening of the nozzle is facing the adsorption mechanism 53. One end of the collection box 51 is connected to the mixing pipe 4, and one end of the collection box 51 is connected to the induced draft fan 6.

[0036] In this embodiment, by providing a soot blowing mechanism 52, the advantage of blowing off the dust and black particles on the surface of the catalyst on the adsorption mechanism 53 while working can be achieved, and the fixed-point cleaning of the adsorption mechanism 53 is achieved, which effectively extends the service life of the adsorption mechanism 53 and achieves energy saving. At the same time, the number of times the catalyst on the adsorption mechanism 53 is replaced is reduced, thereby reducing unnecessary waste, effectively achieving energy saving and environmental protection, and realizing the advantages of long maintenance time and low use cost of the soot blowing device 5.

[0037] In this embodiment, the oil-gas separator 2 includes a conical separation tube 21, a cyclone 22 and a collecting tube 23. The cyclone 22 is arranged at the contracted end of the conical separation tube 21, and the expanded end of the conical separation tube 21 is provided with a separation spacer tube 24 extending into the conical separation tube 21. A separation groove 25 is formed between the separation spacer tube 24 and the conical separation tube 21. The collecting tube 23 is arranged at the expanded end of the conical separation tube 21 and is connected to the separation groove 25. The contracted end of the conical separation tube 21 is connected to the smoke inlet pipe 1, and the expanded end of the conical separation tube 21 is connected to the air intake assembly 33.

[0038] In this embodiment, the oil-gas separator 2 adopts the above-mentioned structure. The exhaust gas enters the smoke inlet pipe 1 and passes through the cyclone 22 to form a cyclonic flow. The exhaust gas flows along the conical separation pipe 21 to the separation tank 25. The oil contained in the exhaust gas is attached to the wall of the separation tank 25. The treated exhaust gas is discharged from the separation baffle pipe 24 and enters the backwash purification device 3. The oil and other impurities collected in the separation tank 25 can flow into the collection pipe 23 from the bottom of the separation tank 25. The impurities collected in the collection pipe 23 can be replaced and processed regularly, which further improves the treatment efficiency of the exhaust gas purification device and enables the exhaust gas to meet the emission standards.

[0039] In this embodiment, the mixing pipe 4 is equipped with a back pressure sensor 41, a spray gun 42, a nitrogen oxide sensor 43, a flow base 44, and a first control valve 45. The first control valve 45 is located at one end near the backflush purification device 3. The flow base 44 is located on one side of the first control valve 45, the nitrogen oxide sensor 43 is located on one side of the flow base 44, the spray gun 42 is located on one side of the nitrogen oxide sensor 43, and the back pressure sensor 41 is located on one side of the spray gun 42. A branch pipe 9 is connected between the mixing pipe 4 and the bypass pipe 8, and the branch pipe 9 is equipped with a second control valve 10. The bypass pipe 8 is equipped with a third control valve 81. A fourth control valve 35 is provided at the connection between the purification chamber 32 and the air intake assembly 33.

[0040] In this embodiment, the mixing tube 4 is provided.

[0041] The back pressure sensor 41 tests the pressure of the exhaust gas entering the mixing tube 4, converts it into a 4-20mA current signal, and outputs it to the PLC for data analysis to obtain the air pressure data in the mixing tube 4. The flow meter in the flow base 44 can detect the amount of exhaust gas entering the mixing tube 4. After processing by the flow meter, it is converted into a current signal and output to the PLC for data analysis to obtain the flow data in the pipeline; in addition, the spray gun 42 atomizes and hydrolyzes the urea output by the urea pump in the mixing tube 4 and the air supplied by the external air machine into NH3, which reacts chemically with NO and NO2 in the system exhaust pipe 7; and after reaching the specified temperature in the denitrification system, the nitrogen and nitrogen oxides sensor 43 is activated to detect nitrogen oxides in the mixing tube 4. and oxygen, converting it into a 4-20mA current signal, which is output to the PLC for data analysis, thereby obtaining the nitrogen oxide concentration and oxygen content. Through the feedback of the above-mentioned components, the device can be better regulated by using the PLC for data analysis, thereby further improving the working efficiency of the device. At the same time, when the back pressure sensor 41 of the mixing tube 4 detects that the pressure at the inlet of the mixing tube 4 is too high, the signal is fed back to the PLC for data analysis, and the second control valve 10 or the third control valve 81 can be controlled to connect the bypass pipe 8 with the induced draft fan 6, so that part of the exhaust gas enters the bypass pipe 8 and is diverted to the induced draft fan 6 through the bypass pipe 8 for discharge, thereby maintaining the exhaust of the soot blowing device 5 unobstructed, preventing the engine from stalling due to increased back pressure, and ensuring the safety of the engine.

[0042] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the scope of protection of the present invention.

Claims

1. An engine exhaust purification device, characterized in that: It includes a smoke inlet pipe, an oil-gas separator, a back-blowing purification device, a mixing pipe, a soot blowing device, an induced draft fan, an exhaust pipe and a bypass pipe. The oil-gas separator is provided with an inlet end and an outlet end. One end of the smoke inlet pipe is connected to the inlet end of the oil-gas separator. The back-blowing purification device is provided with an inlet end and an outlet end. The inlet end of the back-blowing purification device is connected to the outlet end of the oil-gas separator. One end of the mixing pipe is connected to the outlet end of the back-blowing purification device. The soot blowing device is provided with an inlet end and an outlet end. The other end of the mixing pipe is connected to the inlet end of the soot blowing device. The induced draft fan is provided with an inlet end and an outlet end, the outlet end of the soot blowing device is communicated with the inlet end of the induced draft fan, the exhaust pipe is arranged at the outlet end of the induced draft fan, one end of the bypass pipe is communicated with the smoke inlet pipe, and the other end of the bypass pipe is communicated with the induced draft fan; the back-blowing purification device comprises a back-blowing bin, a purification bin, an air inlet assembly and an air outlet assembly, one end of the air inlet assembly is communicated with the purification bin, the back-blowing bin is arranged on one side of the purification bin and is communicated with the purification bin, and one end of the air outlet assembly is communicated with the purification bin; the back-blowing bin includes a confluence A flow bin, several venturis, several reducers, several compensation pipes, several joints, several pulse valves, a vent pipe and an air storage tank. The confluence bin is arranged on the side wall of the purification bin, the venturi is arranged in the confluence bin, and one end of the venturi extends into the purification bin, one end of the reducer is arranged on the side wall of the confluence bin and communicates with the confluence bin, and the reducer is arranged opposite to the corresponding venturi, one end of the compensation pipe is communicated with the other end of the reducer, one end of the joint is connected to the other end of the compensation pipe, and the pulse valve is connected to the joint. The other end is connected, one end of the ventilation pipe is connected to the air storage tank, the other end of the ventilation pipe is communicated with the corresponding pulse valves respectively, and the inlet end of the confluence bin is communicated with the oil-gas separator; the mixing pipe is provided with a back pressure sensor, a spray gun, a nitrogen oxide sensor, a flow base and a first control valve, the first control valve is arranged at one end close to the backflush purification device, the flow base is located on one side of the first control valve, the nitrogen oxide sensor is located on one side of the flow base, the spray gun is located on one side of the nitrogen oxide sensor, and the back pressure sensor is located on one side of the spray gun.

2. The engine exhaust gas purification device according to claim 1, characterized in that: The purification chamber includes a filter box body, a plurality of filter elements, a plurality of partitions, a plurality of funnels and a plurality of carbon deposit barrels. The side wall of the filter box body is provided with a plurality of mounting ports. The filter element insertion mounting port is arranged in the filter box body, and the other end of the filter element extends out of the other side wall of the filter box body. Adjacent rows of filter elements in the filter box body are separated by partitions. The funnel is arranged on the lower end surface of the filter box body and is connected to the filter box body, and the funnels are respectively located below the corresponding filter elements. The carbon deposit barrels are respectively installed at the outlet ends of the funnels, the air inlet assembly is connected to the inlet end of the filter box body, and the air outlet assembly is connected to the outlet end of the filter box body.

3. The engine exhaust gas purification device according to claim 1, characterized in that: The sootblowing device includes a collection box, a sootblowing mechanism and an adsorption mechanism. The sootblowing mechanism is provided with a nozzle. The side wall of the collection box is provided with a mounting hole. The sootblowing mechanism is sleeved in the collection box through the mounting hole. The adsorption mechanism is arranged in the collection box and is located on one side of the sootblowing mechanism. The adsorption mechanism is arranged parallel to the sootblowing mechanism, and the opening of the nozzle faces the adsorption mechanism. One end of the collection box is connected to the mixing pipe, and one end of the collection box is connected to the induced draft fan.

4. The engine exhaust gas purification device according to claim 1, characterized in that: The oil-gas separator includes a conical separation tube, a cyclone and a collecting tube. The cyclone is arranged at the contracted end of the conical separation tube. The expanded end of the conical separation tube is provided with a separation spacer tube extending into the conical separation tube. A separation groove is formed between the separation spacer tube and the conical separation tube. The collecting tube is arranged at the expanded end of the conical separation tube and is connected to the separation groove. The contracted end of the conical separation tube is connected to the smoke inlet pipe, and the expanded end of the conical separation tube is connected to the air intake assembly.

5. The engine exhaust purification device according to claim 1, characterized in that: A branch pipe is provided between the mixing pipe and the bypass pipe, and the branch pipe is provided with a second control valve.

6. The engine exhaust gas purification device according to claim 1, characterized in that: The bypass pipe is provided with a third control valve.

7. The engine exhaust gas purification device according to claim 1, characterized in that: A fourth control valve is provided at the connection between the purification chamber and the air intake assembly.

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