Composite cooling integrated type explosion-proof diesel engine exhaust aftertreatment device and temperature control method

Abstract

The application discloses a composite cooling integrated type explosion-proof diesel engine tail gas aftertreatment device and a temperature control method, which comprises an explosion-proof water-cooled shell, an end cover assembly, a tail gas aftertreatment device heat dissipation system, an explosion-proof urea system, a catalytic assembly, an explosion-proof electric control box and an explosion-proof waste gas water washing system. The explosion-proof water-cooled shell is connected with the end cover assembly. The tail gas aftertreatment device heat dissipation system, the explosion-proof urea system, the catalytic assembly and the explosion-proof electric control box are arranged in the explosion-proof water-cooled shell. The catalytic assembly is located in the middle part of the explosion-proof water-cooled shell. The tail gas aftertreatment device heat dissipation system is located on one side of the catalytic assembly. The explosion-proof urea system and the explosion-proof electric control box are located on the other side of the catalytic assembly. The application improves the integration degree of the system. The composite cooling system is adopted, high-efficiency composite cooling can be realized, the shell surface temperature of the catalytic assembly, the waste water temperature and the exhaust temperature are reduced, the high reaction temperature inside the tail gas aftertreatment device is ensured, and the explosion-proof demand of the underground coal mine is met.

Description

Technical Field

[0001] This invention relates to an explosion-proof temperature control system, specifically to a composite cooling integrated explosion-proof diesel engine exhaust aftertreatment device and temperature control method. Background Technology

[0002] Explosion-proof diesel engines, with their advantages of high compression ratio, large output power, and strong power performance, have become one of the main power sources for auxiliary transportation vehicles such as trackless rubber-tired vehicles and monorail cranes in coal mines, playing a vital role in coal mine production. On December 28, 2020, the Ministry of Ecology and Environment officially approved and released the "Technical Requirements for Pollutant Emission Control of Non-road Diesel Mobile Machinery (Draft for Release)," which stipulates the fourth-stage technical requirements for pollutant emission control of non-road diesel mobile machinery and the diesel engines they use, and clarifies that non-road diesel engines will implement the National IV emission standard from December 2022. To meet the special environment and explosion-proof requirements of underground coal mines, explosion-proof diesel engines, based on the structure of ordinary diesel engines, add explosion-proof components such as intake / exhaust flame arresters and water washing tanks. This increases intake and exhaust resistance, reduces engine intake volume, severely obstructs exhaust, and deteriorates in-cylinder combustion, leading to a deterioration in the emission performance of explosion-proof diesel engines.

[0003] The main pollutants in diesel engine exhaust include: CO, HC, and NO. x To eliminate or purify pollutants such as carbon soot and particulate matter, most mainstream high-pressure common rail diesel engines both domestically and internationally employ a three-way catalytic converter exhaust aftertreatment process. This process consists of three main components: an oxidation catalyst (DOC), a particulate filter (DPF), and a selective catalytic reduction (SCR), meeting the National IV emission standards for non-road applications. However, according to the "Coal Mine Safety Regulations," the surface temperature of any part of an explosion-proof diesel engine must not exceed 150°C, and the exhaust outlet temperature must not exceed 77°C. However, exhaust aftertreatment units such as DOC, SCR, and DPF typically require a high-temperature reaction environment. Under high loads, their surface and exhaust temperatures are far higher than the explosion-proof requirements. Therefore, existing technology cannot resolve the contradiction between the resulting high reaction temperature (200°C~350°C) and the low surface temperature (150°C) of the exhaust aftertreatment device casing.

[0004] The operating conditions in underground coal mines are harsh, requiring frequent replacement of the exhaust aftertreatment device core of explosion-proof diesel engines. However, existing exhaust aftertreatment devices are mostly one-piece welded structures, making disassembly and assembly difficult and unable to meet the needs of frequent replacements. For example, CN202022305984.8 authorizes a mine explosion-proof diesel engine exhaust purification device, proposing to use a water-cooled jacket to perform explosion-proof cooling treatment on DOC, DPF, and SCR reactors. However, the water-cooled jacket in this method is an integral structure with the original reactor, resulting in poor structural reliability, and it does not mention a water-cooled circulation system. CN202211413706.1 discloses an exhaust gas treatment system and method for explosion-proof diesel engines, improving the exhaust gas purification technology of the exhaust aftertreatment system, but it does not mention specific underground explosion-proof methods. CN202220020733.1 discloses an explosion-proof diesel engine exhaust gas treatment box, which only adds a water washing box structure to the original diesel engine exhaust pipe, but it also suffers from low purification efficiency. In order to reduce the surface temperature of the exhaust gas aftertreatment device housing, existing technologies mostly use explosion-proof water-cooling jackets arranged outside the exhaust gas aftertreatment device housing, which leads to technical problems such as complex structure and difficulty in replacement and disassembly of the exhaust gas aftertreatment device. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a composite cooling integrated explosion-proof diesel engine exhaust aftertreatment device and temperature control method. The device has a simple structure and high integration, which ensures the high reaction temperature inside the exhaust aftertreatment device while meeting the explosion-proof requirements of underground coal mines.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a composite cooling integrated explosion-proof diesel engine exhaust aftertreatment device, including an explosion-proof water-cooled shell, an end cover assembly, an exhaust aftertreatment device heat dissipation system, an explosion-proof urea system, a catalytic converter assembly, an explosion-proof electrical control box, and an explosion-proof exhaust gas water washing system, wherein the explosion-proof water-cooled shell is connected to the end cover assembly.

[0007] The exhaust gas aftertreatment device's heat dissipation system, explosion-proof urea system, catalytic component, and explosion-proof electrical control box are housed in an explosion-proof water-cooled housing. The catalytic component is located in the middle of the explosion-proof water-cooled housing, the exhaust gas aftertreatment device's heat dissipation system is located on one side of the catalytic component, and the explosion-proof urea system and explosion-proof electrical control box are located on the other side of the catalytic component.

[0008] The explosion-proof exhaust gas washing system includes an exhaust gas washing tank shell, an exhaust gas washing tank, an air inlet pipe, an exhaust pipe, an explosion-proof water-cooled circulating water pump, an explosion-proof water pump flow rate valve, a water temperature sensor for the water circulation pipeline, a water inlet, and an explosion-proof exhaust temperature sensor. The exhaust gas washing tank is located on the bottom surface of the exhaust gas washing tank shell. The front side of the exhaust gas washing tank is equipped with an air inlet pipe, an explosion-proof water-cooled circulating water pump, and a water inlet. The rear side of the exhaust gas washing tank is equipped with an exhaust pipe. The explosion-proof water pump flow rate valve is installed on the explosion-proof water-cooled circulating water pump.

[0009] The catalytic assembly includes a DOC catalyst housing, a DPF catalyst housing, and an SCR catalyst housing. The DOC catalyst housing, DPF catalyst housing, and SCR catalyst housing are connected in sequence by flange mounting covers. The front end of the DOC catalyst housing passes through the front side wall of the explosion-proof water-cooled housing, and the rear end of the SCR catalyst housing passes through the rear side wall of the explosion-proof water-cooled housing and the front side wall of the exhaust gas washing tank housing, respectively, and then connects to the intake pipe.

[0010] The exhaust gas aftertreatment device's heat dissipation system includes a metal heat dissipation pipe, an intake explosion-proof fan, an exhaust explosion-proof fan, and an explosion-proof housing temperature sensor. The metal heat dissipation pipe is installed on one side wall and the top wall inside the explosion-proof water-cooled housing via mounting clips. Both ends of the metal heat dissipation pipe pass through the rear side wall of the explosion-proof water-cooled housing and the front side wall of the exhaust gas washing tank housing, and are respectively connected to the water inlet and the explosion-proof water pump flow valve. The intake explosion-proof fan is installed on the end cover assembly and the explosion-proof exhaust gas washing tank, and the exhaust explosion-proof fan is installed on the top wall of the explosion-proof water-cooled housing and the explosion-proof exhaust gas washing system.

[0011] Explosion-proof urea systems include explosion-proof urea injection pumps, urea nozzles, urea tanks, and NO₂. X The sensor and urea tank are mounted on the bottom surface inside the explosion-proof water-cooled housing via a urea tank position fixing plate. The explosion-proof urea injection pump is mounted on the top surface of the urea tank. The explosion-proof urea injection pump and the urea nozzle are connected via an injection connection hose. The urea nozzle is connected to the nozzle mounting plate, which is mounted on the outer wall of the SCR catalyst housing.

[0012] NO X The temperature sensor of the explosion-proof housing is set on the outer wall of the SCR catalyst housing; the water temperature sensor of the water circulation pipeline is set on the pipeline connecting the explosion-proof water-cooled circulating water pump and the explosion-proof water pump flow rate valve; and the explosion-proof exhaust temperature sensor is set on the outer wall of the exhaust pipe.

[0013] The explosion-proof electrical control box includes a control box housing, an electrical control box end cover, and an explosion-proof temperature control system embedded controller. The control box housing is mounted on the bottom surface inside the explosion-proof water-cooled housing via a control box position fixing plate. The explosion-proof temperature control system embedded controller is mounted inside the control box housing, and the control box end cover is mounted on the top of the control box housing.

[0014] Furthermore, the end cap assembly includes an end cap, with an end cap screw mounting hole at each of the four corners of the end cap, and an explosion-proof display screen, a start button, an explosion-proof cable connector, and an explosion-proof fan mounting hole for the intake fan in the center of the end cap.

[0015] Furthermore, the explosion-proof water-cooled housing has a heat dissipation perforated plate on the upper part of its interior, an air inlet for the DOC catalyst housing to pass through on the front side wall of the explosion-proof water-cooled housing, an exhaust port for the SCR catalyst housing and the metal heat dissipation pipe to pass through, a water inlet for the water cooling pipe, and a water outlet for the water cooling pipe to drain on the rear side wall of the explosion-proof water-cooled housing, and exhaust explosion-proof fan mounting holes for the installation of the exhaust explosion-proof fan on the front side wall and the upper wall of the explosion-proof water-cooled housing.

[0016] Furthermore, a water replenishment tank is provided on the upper surface of the top wall of the exhaust gas washing tank shell, and the water replenishment tank is connected to the exhaust gas washing tank through a water replenishment pipe.

[0017] Furthermore, the DOC catalyst housing, DPF catalyst housing, and SCR catalyst housing are all equipped with porous catalyst cores, and the flange mounting cover has a catalyst core pressure plate at the protrusion.

[0018] Furthermore, the bottom of the waste gas washing tank shell is provided with a slag discharge port.

[0019] A temperature control method for a composite cooling integrated explosion-proof diesel engine exhaust aftertreatment device involves setting critical values ​​for the casing temperature, water circulation temperature, and exhaust temperature in an embedded controller of the explosion-proof temperature control system. The explosion-proof casing temperature sensor, water circulation pipeline water temperature sensor, and explosion-proof exhaust temperature sensor transmit the collected data to the embedded controller of the explosion-proof temperature control system in real time.

[0020] When the explosion-proof housing temperature sensor detects that the housing temperature exceeds the critical value, the embedded controller of the explosion-proof temperature control system controls the explosion-proof water pump flow rate valve to operate at a large opening, and controls the explosion-proof water-cooled circulating water pump to operate at high speed.

[0021] When the explosion-proof housing temperature sensor detects that the housing temperature exceeds the critical value, and the water circulation pipeline temperature sensor detects that the temperature in the metal heat sink exceeds the critical value, or the explosion-proof exhaust temperature sensor detects that the exhaust temperature is greater than the critical value, the embedded controller of the explosion-proof temperature control system controls the intake explosion-proof fan and the exhaust explosion-proof fan to run at high speed.

[0022] Compared with existing technologies, this invention uses a catalytic component as its core, and can reduce CO, HC, and NO in exhaust gas through catalysis. xCompared to PM particulate matter emissions, this invention employs an integrated mechanism. Without altering the catalytic converter structure, the catalytic converter, explosion-proof electrical control box, explosion-proof urea system, and exhaust gas aftertreatment device heat dissipation system are integrated within an explosion-proof water-cooled housing, improving system integration. The invention utilizes a composite cooling system, consisting of the explosion-proof water-cooled housing and the exhaust gas aftertreatment device heat dissipation system. Wastewater from the exhaust gas washing tank is circulated into metal heat dissipation pipes for water cooling, while explosion-proof intake and exhaust fans installed within the explosion-proof water-cooled housing provide air cooling. This achieves highly efficient composite cooling, reducing the surface temperature of the catalytic converter housing and the wastewater temperature. The temperature and exhaust temperature ensure both a high reaction temperature inside the exhaust gas aftertreatment device and meet the explosion-proof requirements of underground coal mines. The catalytic component is an internally independent and detachable structure. The gap between the catalyst core pressure plate and the porous catalyst core can be adjusted by the mounting threads on the inner wall of the flange mounting cover, ensuring quick disassembly after the porous catalyst core reaches the end of its service life. The explosion-proof temperature control system embedded controller in the explosion-proof electrical control box can monitor and control the temperature of key locations inside the exhaust gas aftertreatment device in real time through explosion-proof housing temperature sensors, water circulation pipeline water temperature sensors, and explosion-proof exhaust temperature sensors, improving system reliability. Attached Figure Description

[0023] Figure 1 This is a schematic cross-sectional view of the present invention;

[0024] Figure 2 This is a schematic diagram of the end cap assembly of the present invention;

[0025] Figure 3 This is a schematic diagram of the explosion-proof water-cooled housing of the present invention;

[0026] Figure 4 This is a schematic diagram showing the installation position of the explosion-proof fan of the present invention;

[0027] Figure 5 This is a schematic diagram of the explosion-proof electrical control box structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the flange mounting cover for the catalyst assembly of the present invention;

[0029] Figure 7 This is a schematic diagram of the explosion-proof exhaust gas washing box of the present invention;

[0030] Figure 8 This is a schematic diagram of the internal component installation structure of the explosion-proof water-cooled housing of the present invention;

[0031] Figure 9 This is a control system diagram of the present invention;

[0032] Figure 10 This is a schematic diagram of the explosion-proof temperature control strategy of the present invention;

[0033] 1. Explosion-proof water-cooled housing; 3. Exhaust gas after-treatment device heat dissipation system; 4. Explosion-proof urea system; 5. Catalytic converter; 6. Explosion-proof electrical control box; 7. Explosion-proof exhaust gas washing system.

[0034] 101. Air inlet; 102. Exhaust outlet; 103. Water inlet for water-cooled pipe; 104. Water outlet for water-cooled pipe; 105. Exhaust explosion-proof fan mounting hole; 106. Heat dissipation plate; 107. Explosion-proof water washing box cable mounting hole; 108. End cover mounting hole; 109. End cover mounting screw.

[0035] 201. End cap screw mounting hole; 202. Explosion-proof cable connector; 203. Explosion-proof display screen; 204. Start button; 205. End cap; 206. Explosion-proof air intake fan mounting hole.

[0036] 301. Metal heat sink; 302. Adapter connector; 303. Intake explosion-proof fan; 304. Exhaust explosion-proof fan; 305. Mounting clip; 306. Explosion-proof housing temperature sensor.

[0037] 401. Explosion-proof urea injection pump; 402. Urea nozzle; 403. Urea tank; 404. Urea tank mounting plate; 405. Injection connection hose; 406. Nozzle mounting plate; 407. NO x sensor;

[0038] 501, DOC catalyst housing; 502, DPF catalyst housing; 503, SCR catalyst housing; 504, porous catalyst core; 505, flange mounting cover; 506, catalyst core pressure plate; 507, mounting thread.

[0039] 601. Electrical control box housing; 602. Electrical control box end cover; 603. Embedded controller for explosion-proof temperature control system; 604. Electrical control box mounting plate; 605. Explosion-proof cable connector; 606. Explosion-proof cooling fan switch interface; 607. Explosion-proof housing temperature sensor interface; 608. CAN communication interface; 609. Explosion-proof display connector; 610. NO x Sensor connectors, 611, explosion-proof exhaust temperature sensor connector, 612, explosion-proof urea injection pump PWM control interface, 613, explosion-proof water pump flow rate valve PWM control interface, 614, explosion-proof water-cooled circulating water pump PWM control interface, 615, circulating pipeline water temperature sensor interface, 616, sensor expansion installation interface.

[0040] 701. Waste gas washing tank housing; 702. Waste gas washing tank; 703. Inlet pipe; 704. Exhaust pipe; 705. Explosion-proof water-cooled circulating water pump; 706. Explosion-proof water pump flow rate valve; 707. Water circulation pipeline temperature sensor; 708. Water inlet; 709. Water replenishment tank; 710. Water replenishment pipe; 711. Slag discharge port; 712. Explosion-proof exhaust temperature sensor. Detailed Implementation

[0041] The invention will now be further described with reference to the accompanying drawings.

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] like Figure 1 and Figure 2 As shown, the present invention includes an explosion-proof water-cooled housing 1, an end cap assembly, a tail gas aftertreatment device heat dissipation system 3, an explosion-proof urea system 4, a catalytic converter 5, an explosion-proof electrical control box 6, and an explosion-proof exhaust gas washing system 7. The tail gas aftertreatment device heat dissipation system 3, the explosion-proof urea system 4, the catalytic converter 5, and the explosion-proof electrical control box 6 are disposed within the explosion-proof water-cooled housing 1. The catalytic converter 5 is located in the middle of the explosion-proof water-cooled housing 1, the tail gas aftertreatment device heat dissipation system 3 is located on one side of the catalytic converter 5, and the explosion-proof urea system 4 and the explosion-proof electrical control box 6 are located on the other side of the catalytic converter 5.

[0044] like Figure 3 As shown, the explosion-proof water-cooled housing 1 has a heat dissipation perforated plate 106 and an explosion-proof water washing tank cable mounting hole 107 on the upper part of its interior. The front side wall of the explosion-proof water-cooled housing 1 has an air inlet 101 for the DOC catalyst housing 501 to pass through. The rear side wall of the explosion-proof water-cooled housing 1 has an exhaust port 102 for the SCR catalyst housing 503 and the metal heat dissipation pipe 301 to pass through, a water cooling pipe inlet 103, and a water cooling pipe drain port 104. The front and upper walls of the explosion-proof water-cooled housing 1 have exhaust explosion-proof fan mounting holes 105 for the installation of the exhaust explosion-proof fan 304. Figure 2 As shown, the end cap assembly includes an end cap 205. Each of the four corners of the end cap 205 has an end cap screw mounting hole 201. The center of the end cap 205 includes an explosion-proof display screen 203, a start button 204, an explosion-proof cable connector 202, and an explosion-proof intake fan mounting hole 206 for mounting an explosion-proof intake fan 303. The start button 204 controls the start / stop state of the invention. The edge of the explosion-proof water-cooled housing 1 has end cap mounting holes 108 at positions corresponding to the end cap screw mounting holes 201. The end cap 205 is connected to the explosion-proof water-cooled housing 1 via end cap mounting screws 109.

[0045] like Figure 7 As shown, the explosion-proof exhaust gas washing system 7 includes an exhaust gas washing tank housing 701, an exhaust gas washing tank 702, an inlet pipe 703, an exhaust pipe 704, an explosion-proof water-cooled circulating water pump 705, an explosion-proof water pump flow rate valve 706, a water circulation pipeline water temperature sensor 707, a water inlet 708, and an explosion-proof exhaust temperature sensor 712. The exhaust gas washing tank 702 is located on the bottom surface of the exhaust gas washing tank housing 701, and the front side of the exhaust gas washing tank 702 is provided with an inlet pipe 704. 3. An explosion-proof water-cooled circulating water pump 705 and an inlet 708 are provided. An exhaust pipe 704 is provided on the rear side of the exhaust gas washing tank 702. An explosion-proof water pump flow rate valve 706 is installed on the explosion-proof water-cooled circulating water pump 705. The upper port of the explosion-proof water pump flow rate valve 706 can be used as the outlet of the explosion-proof exhaust gas washing system 7. A water replenishment tank 709 is provided on the upper surface of the top wall of the exhaust gas washing tank shell 701. The water replenishment tank 709 is connected to the exhaust gas washing tank 702 through a water replenishment pipe 710.

[0046] The water replenishment tank 709 stores a certain amount of water. When the water in the exhaust gas washing tank 702 is insufficient, the water replenishment tank 709 can drain water into the exhaust gas washing tank 702 through the water replenishment pipe 710, thereby replenishing the water evaporated during the circulation process for the heat dissipation system of the exhaust gas after-treatment device. The bottom of the exhaust gas washing tank shell 701 is provided with a slag discharge port 711. When the exhaust gas passes through the exhaust gas washing tank 702, the particulate matter in the exhaust gas will settle at the bottom of the exhaust gas washing tank 702. The slag can be discharged periodically through the slag discharge port 711.

[0047] like Figure 1 , 6As shown in Figure 8, the catalytic assembly 5 includes a DOC catalyst housing 501, a DPF catalyst housing 502, and an SCR catalyst housing 503. The catalytic assembly 5 has an internally detachable structure. The DOC catalyst housing 501, DPF catalyst housing 502, and SCR catalyst housing 503 are connected sequentially via flange mounting covers 505. The front end of the DOC catalyst housing 501 passes through the air inlet 101 reserved in the front side wall of the explosion-proof water-cooled housing 1. The rear end of the SCR catalyst housing 503 passes through the exhaust port 102 reserved in the rear side wall of the explosion-proof water-cooled housing 1 and the front side wall of the exhaust gas washing tank housing 701, and then connects to the air inlet pipe 703. The DOC catalyst housing 501 is connected to the air inlet 101, and the SCR catalyst housing 503 is connected to the exhaust port 102 via flange mounting covers 505. The DOC catalyst housing 501, DPF catalyst housing 502, and SCR catalyst housing 503 are all equipped with porous catalyst cores 504. A catalyst core pressure plate 506 is provided at the boss of the flange mounting cover 505. The gap between the catalyst core pressure plate 506 and the porous catalyst core 504 can be adjusted by the mounting thread 507 on the inner wall of the flange mounting cover 505 to ensure that the porous catalyst core 504 does not move axially in each housing. This facilitates disassembly and replacement of the porous catalyst core 504 after it reaches the end of its service life.

[0048] like Figure 1 , 4 As shown in Figure 8, the exhaust gas aftertreatment device heat dissipation system 3 includes a metal heat dissipation pipe 301, an intake explosion-proof fan 303, an exhaust explosion-proof fan 304, and an explosion-proof housing temperature sensor 306. The metal heat dissipation pipe 301 is installed on one side wall and the top wall inside the explosion-proof water-cooled housing 1 via mounting clips 305. The two ends of the metal heat dissipation pipe 301 are the water inlet and the water outlet. After passing through the water-cooled pipe inlet 103 and water-cooled pipe outlet 104 reserved on the rear side wall of the explosion-proof water-cooled housing 1 and the front side wall of the exhaust gas washing tank housing 701, it is connected to the water inlet 708 and the upper port of the explosion-proof water pump flow valve 706 respectively via conversion connectors 302. The intake explosion-proof fan 303 is installed on the end cover assembly and the cover plate of the explosion-proof exhaust gas washing system 7. The exhaust explosion-proof fan 304 is installed on the top wall of the explosion-proof water-cooled housing 1 and the explosion-proof exhaust gas washing system 7.

[0049] like Figure 1 and 8 As shown, the explosion-proof urea system 4 includes an explosion-proof urea injection pump 401, a urea nozzle 402, a urea tank 403, and an NO... XSensor 407 and urea tank 403 are mounted on the bottom surface inside the explosion-proof water-cooled housing 1 via urea tank position fixing plate 404. Explosion-proof urea injection pump 401 is mounted on the top surface of urea tank 403. Explosion-proof urea injection pump 401 and urea nozzle 402 are connected via injection connection hose 405. Urea nozzle 402 is connected to nozzle mounting plate 406. Nozzle mounting plate 406 is mounted on the outer wall of SCR catalyst housing 503.

[0050] NO X Sensor 407 and explosion-proof housing temperature sensor 306 are installed on the outer wall of SCR catalyst housing 503. Water circulation pipeline temperature sensor 707 is installed on the pipeline connecting explosion-proof water-cooled circulating water pump 705 and explosion-proof water pump flow rate valve 706. Explosion-proof exhaust temperature sensor 712 is installed on the outer wall of exhaust pipe 704.

[0051] like Figure 5 As shown, the explosion-proof electrical control box 6 includes a control box housing 601, an electrical control box end cover 602, and an explosion-proof temperature control system embedded controller 603. The control box housing 601 is mounted on the bottom surface inside the explosion-proof water-cooled housing 1 via a control box positioning fixing plate 604. The explosion-proof temperature control system embedded controller 603 is mounted inside the control box housing 601. The electrical control box end cover 602 is located on the upper part of the control box housing 601. One side of the control box housing 601 is provided with an explosion-proof cable connector 605, an explosion-proof cooling fan switch interface 606, an explosion-proof housing temperature sensor interface 607, a CAN communication interface 608, an explosion-proof display connector 609, and a NO... X Sensor connector 610, explosion-proof exhaust temperature sensor connector 611, explosion-proof urea injection pump PWM control interface 612, explosion-proof water pump flow rate valve PWM control interface 613, explosion-proof water-cooled circulating water pump PWM control interface 614, and circulating pipeline water temperature sensor interface 615; considering future upgrades and improvements, a sensor expansion installation interface 616 is added to one side of the electrical control box housing 601.

[0052] Taking its application in trackless rubber-tired vehicles as an example, such as Figure 9 As shown, the trackless rubber-wheeled vehicle's own power cable supplies power to the present invention through an explosion-proof cable connector 202. The explosion-proof cable connector 202, inside the explosion-proof water-cooled housing 1, connects to the explosion-proof cable connector 605 to supply power to the explosion-proof electrical control box 6. The trackless rubber-wheeled vehicle's onboard ECU is connected to the CAN communication interface 608, which can transmit the detection data from various sensors inside the explosion-proof electrical control box 6 to the trackless rubber-wheeled vehicle in real time. The explosion-proof exhaust temperature sensor connector 611 connects to the explosion-proof exhaust temperature sensor 712. x Sensor connector 610 and NO xSensor 407 is connected; the explosion-proof housing temperature sensor interface 607 is connected to the explosion-proof housing temperature sensor 306; the explosion-proof urea injection pump PWM control interface 612 is connected to the explosion-proof urea injection pump 401; the explosion-proof water pump flow rate valve PWM control interface 613 is connected to the explosion-proof water pump flow rate valve 706; the explosion-proof water-cooled circulating water pump PWM control interface 614 is connected to the explosion-proof water-cooled circulating water pump 705; the circulating pipeline water temperature sensor interface 615 is connected to the water circulation pipeline water temperature sensor 707; and the explosion-proof temperature control system embedded controller 60 is connected. 3. The operating status of the above components can be controlled in real time; the explosion-proof heat dissipation fan switch interface 606 is connected to the intake explosion-proof fan 303 and the exhaust explosion-proof fan 304, and the operating speed of the intake explosion-proof fan 303 and the exhaust explosion-proof fan 304 is controlled by the embedded controller 603 of the explosion-proof temperature control system, so as to ensure that the internal temperature of the explosion-proof water-cooled housing 1 is below 150°C, while ensuring that the temperature of the metal heat dissipation pipe 301 meets the safety requirements of the coal mine underground regulations; the explosion-proof display screen 203 is connected to the explosion-proof display connector 609, which can display the working status of the present invention in real time.

[0053] The exhaust gas aftertreatment device's heat dissipation system 3 and the explosion-proof exhaust gas water washing system 7 share a set of metal heat dissipation pipes 301. Water from the exhaust gas water washing tank 702 flows through the metal heat dissipation pipes 301 via the explosion-proof water-cooled circulating water pump 705 and the explosion-proof water pump flow valve 706, achieving internal cooling of the explosion-proof water-cooled housing 1 through water circulation. Figure 10 As shown, this invention is pre-started by the start button 204 before the trackless rubber-wheeled vehicle starts running. The explosion-proof temperature control system embedded controller 603 controls the operation of the exhaust gas aftertreatment device heat dissipation system 3, explosion-proof urea system 4, and explosion-proof exhaust gas water washing system 7. Among them, the explosion-proof water-cooled circulating water pump 705 draws wastewater from the exhaust gas water washing tank 702 into the metal heat dissipation pipe 301 for circulation, realizing the explosion-proof water cooling function. At the same time, the intake explosion-proof fan 303 and the exhaust explosion-proof fan 304 operate in real time, ensuring that the water temperature in the metal heat dissipation pipe 301 is below 150°C through air cooling. The coal mine safety regulations require a temperature of ℃. The start button 204 inputs a 24V switch signal to the embedded controller 603 of the explosion-proof temperature control system. The embedded controller 603 outputs a 12V switch signal to control the intake explosion-proof fan 303, exhaust explosion-proof fan 304, and explosion-proof water-cooled circulating water pump 705 to operate at low speed. The embedded controller 603 outputs a PWM signal to control the explosion-proof water pump flow rate valve 706 to operate at a small opening, allowing cooling water to circulate between the metal heat sink 301 and the exhaust gas washing tank 702. At this time, the system is in a combined cooling state. The air cooling effect of the intake explosion-proof fan 303 and exhaust explosion-proof fan 304, combined with the water cooling effect of the metal heat sink 301, reduces both the internal reaction temperature of the explosion-proof water-cooled housing 1 and the surface temperature of the metal heat sink 301. Once the explosion-proof display screen 203 shows all data is normal, the vehicle can start the diesel engine and drive.

[0054] The embedded controller 603 of the explosion-proof temperature control system sets a critical temperature value of 120℃ for the housing, 70℃ for the water circulation temperature, and 60℃ for the exhaust temperature, all of which are lower than the requirements of the coal mine safety regulations. The explosion-proof housing temperature sensor 306 monitors the housing temperature in real time, the water circulation pipe temperature sensor 707 monitors the cooling water temperature in the metal heat sink 301 in real time, and the explosion-proof exhaust temperature sensor 712 monitors the temperature at the exhaust pipe in real time. These sensors transmit the collected analog values ​​to the embedded controller 603 in real time. When the explosion-proof housing temperature sensor 306 detects that the housing temperature exceeds 120℃, the embedded controller 603 outputs a PWM signal to control the explosion-proof water pump flow valve 706 to operate at full opening and outputs a 24V switching signal. The explosion-proof water-cooled circulating water pump 705 is controlled to run at high speed, increasing the flow rate of the circulating water and the valve opening, thereby improving the water cooling effect. When the explosion-proof housing temperature sensor 306 detects a housing temperature exceeding 120°C, and the water circulation pipeline temperature sensor 707 detects a temperature exceeding 70°C in the metal heat sink 301, or the explosion-proof exhaust temperature sensor 712 detects an exhaust temperature greater than 60°C, the exhaust gas aftertreatment device needs to further enhance the combined cooling effect. At this time, the embedded controller 603 of the explosion-proof temperature control system outputs a 24V electrical signal to the intake explosion-proof fan 303 and the exhaust explosion-proof fan 304, controlling them to run at high speed. The entire system operates at maximum air and water cooling efficiency, accelerating the heat dissipation of the exhaust gas aftertreatment device housing and the cooling effect of the circulating water.

[0055] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any minor modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present invention should be included within the protection scope of the present invention.

Claims

1. A composite cooling integrated explosion-proof diesel engine exhaust aftertreatment device, comprising an explosion-proof water-cooled housing (1), an end cap assembly, an exhaust aftertreatment device heat dissipation system (3), an explosion-proof urea system (4), a catalytic converter assembly (5), an explosion-proof electrical control box (6), and an explosion-proof exhaust gas water washing system (7), wherein the explosion-proof water-cooled housing (1) is connected to the end cap assembly, characterized in that, The exhaust gas aftertreatment device heat dissipation system (3), explosion-proof urea system (4), catalytic component (5) and explosion-proof electrical control box (6) are installed in the explosion-proof water-cooled shell (1). The catalytic component (5) is located in the middle of the explosion-proof water-cooled shell (1). The exhaust gas aftertreatment device heat dissipation system (3) is located on one side of the catalytic component (5). The explosion-proof urea system (4) and explosion-proof electrical control box (6) are located on the other side of the catalytic component (5). The explosion-proof exhaust gas washing system (7) includes an exhaust gas washing tank shell (701), an exhaust gas washing tank (702), an air inlet pipe (703), an exhaust pipe (704), an explosion-proof water-cooled circulating water pump (705), an explosion-proof water pump flow rate valve (706), a water circulation pipeline water temperature sensor (707), a water inlet (708), and an explosion-proof exhaust temperature sensor (712). The exhaust gas washing tank (702) is located on the bottom surface of the exhaust gas washing tank shell (701). The front side of the exhaust gas washing tank (702) is provided with an air inlet pipe (703), an explosion-proof water-cooled circulating water pump (705), and a water inlet (708). The rear side of the exhaust gas washing tank (702) is provided with an exhaust pipe (704). The explosion-proof water pump flow rate valve (706) is located on the explosion-proof water-cooled circulating water pump (705). The catalyst assembly (5) includes a DOC catalyst housing (501), a DPF catalyst housing (502), and an SCR catalyst housing (503). The DOC catalyst housing (501), DPF catalyst housing (502), and SCR catalyst housing (503) are connected in sequence by a flange mounting cover (505). The front end of the DOC catalyst housing (501) passes through the front side wall of the explosion-proof water-cooled housing (1), and the rear end of the SCR catalyst housing (503) passes through the rear side wall of the explosion-proof water-cooled housing (1) and the front side wall of the exhaust gas washing box housing (701) and then connects to the intake pipe (703). The exhaust gas aftertreatment device heat dissipation system (3) includes a metal heat dissipation pipe (301), an intake explosion-proof fan (303), an exhaust explosion-proof fan (304), and an explosion-proof housing temperature sensor (306). The metal heat dissipation pipe (301) is installed on one side wall and the top wall inside the explosion-proof water-cooled housing (1) by means of a mounting buckle (305). Both ends of the metal heat dissipation pipe (301) pass through the rear side wall of the explosion-proof water-cooled housing (1) and the front side wall of the exhaust gas washing tank housing (701) and are respectively connected to the water inlet (708) and the explosion-proof water pump flow valve (706). The intake explosion-proof fan (303) is installed on the end cover assembly and the exhaust gas washing tank (702) of the explosion-proof exhaust gas washing system (7). The exhaust explosion-proof fan (304) is installed on the top wall of the explosion-proof water-cooled housing (1) and the explosion-proof exhaust gas washing system (7). The explosion-proof urea system (4) includes an explosion-proof urea injection pump (401), a urea nozzle (402), a urea tank (403), and NO X The sensor (407) and urea tank (403) are installed on the bottom surface inside the explosion-proof water-cooled housing (1) via the urea tank position fixing plate (404). The explosion-proof urea injection pump (401) is installed on the top surface of the urea tank (403). The explosion-proof urea injection pump (401) and urea nozzle (402) are connected via the injection connection hose (405). The urea nozzle (402) is connected to the nozzle mounting plate (406). The nozzle mounting plate (406) is installed on the outer wall of the SCR catalyst housing (503). NO X Sensor (407) and explosion-proof housing temperature sensor (306) are installed on the outer wall of SCR catalyst housing (503), water circulation pipeline temperature sensor (707) is installed on the pipeline connecting explosion-proof water-cooled circulating water pump (705) and explosion-proof water pump flow rate valve (706), and explosion-proof exhaust temperature sensor (712) is installed on the outer wall of exhaust pipe (704). The explosion-proof electrical control box (6) includes an electrical control box housing (601), an electrical control box end cover (602), and an explosion-proof temperature control system embedded controller (603). The electrical control box housing (601) is installed on the bottom surface inside the explosion-proof water-cooled housing (1) via an electrical control box position fixing plate (604). The explosion-proof temperature control system embedded controller (603) is installed in the electrical control box housing (601), and the electrical control box end cover (602) is installed on the upper part of the electrical control box housing (601).

2. The composite cooling integrated explosion-proof diesel engine exhaust aftertreatment device according to claim 1, characterized in that, The end cap assembly includes an end cap (205), with an end cap screw mounting hole (201) at each of the four corners of the end cap (205), and an explosion-proof display screen (203), a start button (204), an explosion-proof cable connector (202), and an explosion-proof fan mounting hole (206) for installing an explosion-proof fan (303) in the middle of the end cap (205).

3. The composite cooling integrated explosion-proof diesel engine exhaust aftertreatment device according to claim 1, characterized in that, The explosion-proof water-cooled housing (1) has a heat dissipation plate (106) on the upper part of its interior. The front side wall of the explosion-proof water-cooled housing (1) has an air inlet (101) through which the DOC catalyst housing (501) passes. The rear side wall of the explosion-proof water-cooled housing (1) has an exhaust port (102), a water inlet (103), and a water outlet (104) through which the SCR catalyst housing (503) and the metal heat dissipation pipe (301) pass. The front side wall and the upper wall of the explosion-proof water-cooled housing (1) have exhaust explosion-proof fan mounting holes (105) for the installation of the exhaust explosion-proof fan (304).

4. The composite cooling integrated explosion-proof diesel engine exhaust aftertreatment device according to claim 1, characterized in that, The upper surface of the top wall of the waste gas washing tank shell (701) is provided with a water replenishment tank (709), and the water replenishment tank (709) is connected to the waste gas washing tank (702) through a water replenishment pipe (710).

5. The composite cooling integrated explosion-proof diesel engine exhaust aftertreatment device according to claim 1, characterized in that, The DOC catalyst housing (501), DPF catalyst housing (502) and SCR catalyst housing (503) are all equipped with porous catalyst cores (504), and the flange mounting cover (505) has a catalyst core pressure plate (506) at the boss.

6. The composite cooling integrated explosion-proof diesel engine exhaust aftertreatment device according to claim 1, characterized in that, The waste gas washing tank shell (701) is provided with a slag discharge port (711) at the bottom.

7. The temperature control method for a composite cooling integrated explosion-proof diesel engine exhaust aftertreatment device according to any one of claims 1-6, characterized in that, In the embedded controller (603) of the explosion-proof temperature control system, the critical values ​​for the housing temperature, the water circulation temperature, and the exhaust temperature are set. The explosion-proof housing temperature sensor (306), the water circulation pipeline water temperature sensor (707), and the explosion-proof exhaust temperature sensor (712) transmit the collected data to the embedded controller (603) of the explosion-proof temperature control system in real time. When the explosion-proof housing temperature sensor (306) detects that the housing temperature exceeds the critical value, the embedded controller (603) of the explosion-proof temperature control system controls the explosion-proof water pump flow valve (706) to operate at a large opening, and controls the explosion-proof water-cooled circulating water pump (705) to operate at high speed. When the explosion-proof housing temperature sensor (306) detects that the housing temperature exceeds the critical value, and when the water circulation pipeline water temperature sensor (707) detects that the temperature in the metal heat sink (301) exceeds the critical value or the explosion-proof exhaust temperature sensor (712) detects that the exhaust temperature is greater than the critical value, the explosion-proof temperature control system embedded controller (603) controls the intake explosion-proof fan (303) and the exhaust explosion-proof fan (304) to run at high speed.

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