Explosion-proof diesel engine dry exhaust gas forced cooling and purification system

Abstract

The present invention discloses an explosion-proof diesel engine dry exhaust gas forced cooling and purification system. The explosion-proof diesel engine dry exhaust gas forced cooling and purification system adopts a purification treatment method combining a pretreatment subsystem, a heat exchange subsystem and a filtration subsystem. The urea aqueous solution is forced to be sprayed to realize the oxidation and reduction of nitrogen oxides in the exhaust gas. Then, the high-temperature exhaust gas enters the heat exchanger through a double exhaust pipe for cooling, and forced ventilation cooling is used for explosion protection. Finally, the exhaust gas is purified by spark extinction, soot particulate matter capture and activated carbon adsorption in sequence. The system of the present invention adopts a dry structure, abandons the complex equipment and large volume brought by the wet purification system in the related technology, makes the whole system more compact, reasonable in structure, reduces the weight, effectively improves the transportation capacity of the underground transport vehicle, and also makes the installation and deployment process more convenient and safe, and reduces the installation difficulty and cost.

Description

Technical Field

[0001] The present invention relates to the technical field of gas treatment, and particularly to an explosion-proof diesel engine dry tail gas forced cooling and purification system. Background Art

[0002] Explosion-proof diesel engines are widely used in flammable and explosive environments such as underground coal mines, and their power performance and stability have been widely recognized. However, there are certain problems in the exhaust gas purification of explosion-proof diesel engines.

[0003] During the operation of a diesel engine, the matrix temperature is relatively high, and the surface temperature of its exhaust pipe is usually high. Direct emission of tail gas may ignite the gas in the roadway. Moreover, the exhaust gas contains nitrogen oxides, soot particles, etc. Excessive content will irritate the respiratory system of underground personnel, causing discomfort and even poisoning.

[0004] Therefore, related technologies propose to set up an exhaust gas purification system on the diesel engine to reduce the tail gas temperature and separate the irritating gases in the tail gas. For example, the purification system adopts a wet purification structure of a water washing tank, but it has the problem that the soot particles after water washing combine with water, easily adhere to the flame arrester, resulting in a reduction in the ventilation efficiency of the flame arrester, and the tail gas purification effect is poor. Moreover, during the discharge process of the water washing tank, the airway may be washed open without sufficient contact with water, losing the function of water washing. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems in the related technologies to some extent.

[0006] To this end, an embodiment of the present invention provides an explosion-proof diesel engine dry tail gas forced cooling and purification system, which effectively reduces the exhaust resistance of the diesel engine, improves the working efficiency, and reduces the content of harmful gases.

[0007] The explosion-proof diesel engine dry tail gas forced cooling and purification system according to the embodiment of the present invention includes:

[0008] A pretreatment subsystem, the pretreatment subsystem includes a purification pipe and a solution tank. The purification pipe is connected to the solution tank and the exhaust pipe of the diesel engine, so that the tail gas discharged from the diesel engine flows into the purification pipe, and the urea aqueous solution transported by the solution tank is used to purify the tail gas and reduce the tail gas to a first temperature;

[0009] A heat exchange subsystem, the heat exchange subsystem includes a heat exchanger and a air supply component. The heat exchanger has a gas channel and a refrigerant channel. The heat exchanger is connected to the purification pipe and the air supply component. The air supply component is used to supply air into the refrigerant channel to take away the heat in the tail gas at the first temperature flowing into the gas channel and reduce the tail gas to a second temperature. The air supply component is also used to supply air into the gas channel to dilute the tail gas at the second temperature and reduce it to a third temperature;

[0010] A filtering subsystem, the filtering subsystem includes a purifier, the purifier has a flame retardant layer, a soot filtering layer and an odor removing layer, the purifier is connected to the heat exchanger so that the exhaust gas at the third temperature sequentially flows through the flame retardant layer, the soot filtering layer and the odor removing layer for treatment.

[0011] The explosion-proof diesel engine dry-type exhaust gas forced cooling and purification system according to the embodiment of the present invention adopts a dry structure, abandons the complex equipment and large volume brought by the wet purification system in the related technology, makes the whole system more compact, reasonable in structure, reduces the weight, effectively improves the transportation capacity of the underground transport vehicle, and also makes the installation and deployment process more convenient and safe, and reduces the installation difficulty and cost.

[0012] In some embodiments, the purification pipe includes a connecting section, a purification section and a diversion section connected in sequence, the connecting section is a corrugated pipe, the connecting section is connected to the exhaust pipe of the diesel engine, the purification section is provided with a spraying port, the inner cavity of the solution tank is communicated with the spraying port through a pipeline, the heat exchange subsystem and the filtering subsystem both have a plurality of and correspond one by one, and the diversion section is connected to the heat exchangers of the plurality of heat exchange subsystems.

[0013] In some embodiments, the pretreatment subsystem further includes a first explosion-proof motor, a variable flow pump and an electric control valve, the first explosion-proof motor is connected to the variable flow pump, and the variable flow pump and the electric control valve are arranged on the pipeline between the solution tank and the purification pipe.

[0014] In some embodiments, a first temperature sensor is arranged on the peripheral wall of the diversion section of the purification pipe.

[0015] In some embodiments, the heat exchanger includes an outer box body, an inner cylinder body and heat exchange pipes, the inner cylinder body is arranged in the outer box body, one end of the inner cylinder body penetrates through the outer box body and is connected to the diversion section of the purification pipe through a pipeline, the other end of the inner cylinder body penetrates through the outer box body and is connected to the purifier through a pipeline, the inner cavity of the inner cylinder body is the gas channel, the heat exchange pipes penetrate through the inner cylinder body, one end of the heat exchange pipe is located inside the outer box body, the other end of the heat exchange pipe penetrates through the outer box body and is located outside the outer box body, and the inner cavity of the heat exchange pipe is the refrigerant channel.

[0016] In some embodiments, the air supply assembly includes a second explosion-proof motor, an explosion-proof flame arrester, and an explosion-proof induced draft fan. The second explosion-proof motor is connected to the explosion-proof induced draft fan. The explosion-proof flame arrester is arranged at the air inlet of the explosion-proof induced draft fan. An air outlet is provided on the outer box body. The pipeline connecting the inner cylinder and the purifier is defined as a mixing pipe. The air outlet of the explosion-proof induced draft fan is communicated with the air outlet and the inner cavity of the mixing pipe through a pipeline.

[0017] In some embodiments, the purifier includes a housing and a flame arrestor net, a filter cloth, a filter bag, and a support mesh plate arranged in the housing. The housing is cylindrical. The flame arrestor net, the filter cloth, the filter bag, and the support mesh plate are arranged in sequence in the direction of gas flow from upstream to downstream.

[0018] In some embodiments, a mounting seat is provided at the port of the mixing pipe. The mounting seat is detachably connected to the housing.

[0019] In some embodiments, the filtration subsystem further includes a gas detection sensor and a second temperature sensor. The gas detection sensor and the second temperature sensor are arranged at the outlet of the purifier.

[0020] In some embodiments, the explosion-proof diesel engine dry exhaust gas forced cooling and purification system further includes a control unit. The control unit is connected to the pretreatment subsystem, the heat exchange subsystem, and the filtration subsystem to regulate the operating conditions of each subsystem according to the data uploaded by each subsystem. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the explosion-proof diesel engine dry exhaust gas forced cooling and purification system according to an embodiment of the present invention.

[0022] Figure 2 is a schematic diagram of the purification pipe of the pretreatment subsystem according to an embodiment of the present invention.

[0023] Figure 3 is a schematic diagram of the urea aqueous solution supply of the pretreatment subsystem according to an embodiment of the present invention.

[0024] Figure 4 is a schematic diagram of the heat exchange subsystem according to an embodiment of the present invention.

[0025] Figure 5 is a schematic structural diagram of the heat exchanger according to an embodiment of the present invention.

[0026] Figure 6 is an enlarged structural view of the heat exchange pipe according to an embodiment of the present invention.

[0027] Figure 7 is a schematic diagram of the purifier of the filtration subsystem according to an embodiment of the present invention.

[0028] Figure 8 It is an exploded view of the purifier according to an embodiment of the present invention.

[0029] Figure 9 It is a schematic diagram of the intelligent detection and control of the explosion-proof diesel engine dry exhaust gas forced cooling and purification system according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] 100 - Diesel engine,

[0032] 1 - Pretreatment subsystem, 11 - Purification pipe, 111 - Connection section, 112 - Purification section, 113 - Shunt section, 114 - Spraying port, 12 - Solution tank, 13 - First explosion-proof motor, 14 - Variable flow pump, 15 - Electric control valve, 16 - First temperature sensor,

[0033] 2 - Heat exchange subsystem, 21 - Heat exchanger, 211 - Outer box body, 212 - Inner cylinder body, 213 - Heat exchange pipe, 214 - Mixing pipe, 215 - Mounting seat, 22 - Air supply component, 221 - Second explosion-proof motor, 222 - Explosion-proof flame arrester, 223 - Explosion-proof induced draft fan,

[0034] 3 - Filtration subsystem, 31 - Purifier, 311 - Shell, 312 - Flame arrestor net, 313 - Filter cloth, 314 - Filter bag, 315 - Support mesh plate, 32 - Gas detection sensor, 33 - Second temperature sensor,

[0035] 4 - Control unit, 5 - Power supply. Detailed implementation manners

[0036] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0037] The explosion-proof diesel engine dry exhaust gas forced cooling and purification system according to an embodiment of the present invention will be described below with reference to the drawings.

[0038] As Figures 1 to 9 shown, the explosion-proof diesel engine dry exhaust gas forced cooling and purification system according to an embodiment of the present invention includes: a pretreatment subsystem 1, a heat exchange subsystem 2, and a filtration subsystem 3. The three systems are combined to oxidize and reduce nitrogen oxides in the exhaust gas of the explosion-proof diesel engine 100, and after forcibly cooling the exhaust gas, capture soot particles and remove odors, thereby realizing the purification treatment of the exhaust gas, making the exhaust gas emission more environmentally friendly, greatly reducing the pollution of the air in the roadway, and creating a safer and healthier working environment for underground workers.

[0039] Among them, as Figures 1 to 3As shown in the figure, the pretreatment subsystem 1 includes a purification pipe 11 and a solution tank 12. The inlet of the purification pipe 11 is connected to the exhaust pipe of the diesel engine 100, so that the exhaust gas discharged from the diesel engine 100 flows into the purification pipe 11. The solution tank 12 communicates with the inner cavity of the purification pipe 11, and an aqueous urea solution is stored in the solution tank 12 to transport the aqueous urea solution into the purification pipe 11 to contact the exhaust gas, oxidize and reduce nitrogen oxides in the exhaust gas by using the aqueous urea solution, and reduce the exhaust gas to the first temperature.

[0040] It can be understood that through the pretreatment subsystem 1 of oxidation and reduction by the aqueous urea solution, the effective reduction of nitrogen oxides in the exhaust gas is realized, and the content of harmful substances in the exhaust gas is significantly reduced.

[0041] As Figure 1 and Figures 4 to 6 As shown in the figure, the heat exchange subsystem 2 includes a heat exchanger 21 and a air supply component 22. The heat exchanger 21 has a gas channel and a refrigerant channel. The inlet of the gas channel of the heat exchanger 21 is connected to the outlet of the purification pipe 11, so that the pretreated exhaust gas flows into the gas channel of the heat exchanger 21. The air supply component 22 communicates with the refrigerant channel of the heat exchanger 21, so that the air supply component 22 forcibly sends the gas in the low-temperature environment into the refrigerant channel, so that the forced cold air exchanges heat with the pretreated exhaust gas, and reduces the exhaust gas at the first temperature to the second temperature. And, the air supply component 22 also communicates with the outlet of the gas channel of the heat exchanger 21, mixes the forced cold air with the exhaust gas at the second temperature, and further dilutes the exhaust gas, and further reduces the exhaust gas at the second temperature to the third temperature, so that the temperature of the exhaust gas meets the requirement of being lower than the emission standard (the standard is lower than 77 °C).

[0042] Thus, by gradually reducing the exhaust gas temperature in multiple steps, each step can be optimized for a specific temperature range, thereby improving the overall cooling efficiency and helping to optimize the exhaust gas treatment efficiency. Compared with direct cooling, a large amount of coolant or energy is required to quickly reduce the high-temperature exhaust gas, while gradual cooling can reduce energy consumption.

[0043] And, by combining the two cooling methods of forced air-cooled heat exchange and cold air dilution, the cooling efficiency of the exhaust gas is effectively improved, ensuring that the exhaust gas temperature is reduced below the emission temperature standard, thereby reducing the risk of underground fires and gas explosions.

[0044] As Figure 1 and Figure 7 and Figure 8As shown in the figure, the filtration subsystem 3 includes a purifier 31, which has a fireproof layer, a soot filtration layer, and a deodorization layer arranged in sequence along the gas flow direction from upstream to downstream. The purifier 31 is connected to the outlet of the gas passage of the heat exchanger 21, so that the tail gas after forced cooling and temperature reduction flows through the fireproof layer, the soot filtration layer, and the deodorization layer in sequence for treatment, and can be normally discharged into the roadway after treatment.

[0045] Among them, the fireproof layer is used to eliminate the possible flames in the tail gas, the soot filtration layer is used to filter the soot particles in the tail gas, and the deodorization layer is used to reduce the pungent smell of the tail gas.

[0046] It should be noted that since some hydrocarbons in the tail gas will decompose into an unstable state under high-temperature environments, the tail gas is first cooled and then filtered. After cooling, the soot particles are stable, which is convenient for the purifier 31 to finally filter. Moreover, since the filter material is not suitable for long-term use in high-temperature environments, after the tail gas is cooled, the service life and performance of the filter material can be improved.

[0047] In summary, the explosion-proof diesel engine dry tail gas forced cooling and purification system of the embodiment of the present invention adopts a dry structure, abandons the complex equipment and large volume brought by the wet purification system in the related technology, makes the whole system more compact, reasonable in structure, reduces weight, effectively improves the transportation capacity of the underground transport vehicle, and also makes the installation and deployment process more convenient and safe, and reduces the installation difficulty and cost.

[0048] In some embodiments, as Figures 1 to 3 shown, the purification pipe 11 includes a connection section 111, a purification section 112, and a diversion section 113 connected in sequence, and each section is detachably connected by a flange and a bolt.

[0049] Among them, the connection section 111 is a shock-absorbing bellows, which is connected to the exhaust pipe of the diesel engine 100 by the bellows, facilitating the installation and maintenance of the purification system of the present invention. Moreover, since the diesel engine 100 generates large vibrations during operation, the bellows can effectively absorb and disperse these vibrations, thereby reducing the impact of the vibrations on the system.

[0050] Spraying ports 114 are opened on the pipe wall of the purification section 112, so that the inner cavity of the solution tank 12 is connected to the spraying ports 114 through a pipeline. The pipeline between the two is a urea spraying pipe, and a nozzle is provided at the outlet of the urea spraying pipe, so as to spray the urea aqueous solution into the purification section 112 through the urea spraying pipe to realize the oxidation-reduction of nitrogen oxides in the tail gas.

[0051] The heat exchange subsystem 2 and the filtration subsystem 3 are both multiple and in one-to-one correspondence. The shunt section 113 is connected to the heat exchangers 21 of the multiple heat exchange subsystems 2. It can be understood that the shunt section 113 is composed of multiple pipe sections arranged in parallel. The number of pipe sections of the shunt section 113 is the same as the number of heat exchange subsystems 2, so that the pretreated tail gas is shunted into the heat exchangers 21 of the multiple heat exchange subsystems 2. By setting multiple parallel purification lines, the efficiency of subsequent forced cooling and filtration can be improved.

[0052] Optionally, as Figures 1 to 3 shown, the shunt section 113 adopts a double-exhaust form and correspondingly flows into two heat exchange subsystems 2 and the filtration subsystem 3, so as to adapt to the explosion-proof diesel engine 100 in the current actual roadway construction.

[0053] In some embodiments, as Figures 1 to 3 shown, the pretreatment subsystem 1 further includes a first explosion-proof motor 13, a variable flow pump 14 and an electric control valve 15. The first explosion-proof motor 13 is connected to the variable flow pump 14, and the variable flow pump 14 and the electric control valve 15 are arranged on the urea spraying pipe.

[0054] It can be understood that the first explosion-proof motor 13 is used to drive the variable flow pump 14 to operate. When the first explosion-proof motor 13 is powered on by the power supply 5, the motor starts to rotate. The rotation of the motor is connected to the impeller or piston and other pump components of the variable flow pump 14 through the shaft, so as to transmit the power of the motor to the pump.

[0055] Driven by the first explosion-proof motor 13, the variable flow pump 14 pumps the urea aqueous solution in the solution tank 12 into the pump, and then increases the pressure through the pump components to push the urea aqueous solution into the purification pipe 11. The flow rate of the urea aqueous solution can be controlled by parameters such as the rotation speed of the pump, the diameter of the impeller or the area of the piston. In addition, by adjusting the opening of the outlet valve (electric control valve 15) of the pump, the flow rate of the fluid can also be controlled.

[0056] When it is necessary to stop the operation of the variable flow pump 14, the power supply 5 of the first explosion-proof motor 13 can be cut off, the motor stops rotating, and the operation of the pump also stops accordingly.

[0057] In some embodiments, as Figure 1 and Figure 2 shown, a first temperature sensor 16 is provided on the peripheral wall of the shunt section 113 of the purification pipe 11.

[0058] Optionally, the first temperature sensor 16 is a surface temperature sensor for measuring the surface temperature of the pipe where the pretreated exhaust gas is located. For example, a thermal resistance surface temperature sensor, a thermocouple surface temperature sensor, or a thermistor surface temperature sensor. The peripheral wall of the purification pipe 11 is wrapped with heat insulation material, and the temperature of the exhaust gas is reduced by spraying an aqueous urea solution to ensure that the surface temperature of the purification pipe 11 is lower than 150 °C, prevent fires, and reduce the risk of thermal damage.

[0059] It can be understood that the first temperature sensor 16 monitors the surface temperature of the purification pipe 11 in real time. When the temperature is too high, the flow rate of the aqueous urea solution is increased to ensure that the temperature is lower than the standard of the surface temperature of the roadway equipment. When the temperature is too low, the flow rate of the aqueous urea solution is reduced to avoid excessive water content in the exhaust gas, which affects the filtering effect of the subsequent purifier 31, and at the same time avoids solution waste.

[0060] In some embodiments, as Figures 4 to 6 shown, the heat exchanger 21 includes an outer box body 211, an inner cylinder body 212, and heat exchange tubes 213.

[0061] The outer box body 211 is a cuboid box body, and the inner cylinder body 212 is arranged in the outer box body 211 along the length direction of the outer box body 211. Both ends of the inner cylinder body 212 penetrate through the two end walls of the outer box body 211 in the length direction, and both ends of the inner cylinder body 212 are in a flared shape.

[0062] One end of the inner cylinder body 212 located upstream in the gas flow direction is connected to the diversion section 113 of the purification pipe 11, so that the pretreated exhaust gas flows to the inner cylinder body 212, that is, the inner cavity of the inner cylinder body 212 is the gas passage of the heat exchanger 21 described above.

[0063] There are multiple heat exchange tubes 213. The heat exchange tubes 213 vertically penetrate the inner cylinder body 212, one end of the heat exchange tube 213 is located in the outer box body 211, the other end of the heat exchange tube 213 penetrates through the end wall of the outer box body 211 in the height direction and is located outside the outer box body 211, and the inner cavity of the heat exchange tube 213 is the refrigerant passage of the heat exchanger 21 described above.

[0064] Thus, the air supply assembly 22 conveys cold air into the box body, and the cold air flows through the multiple heat exchange tubes 213, thereby taking away the heat in the exhaust gas in the inner cylinder body 212 to achieve temperature reduction.

[0065] One end of the inner cylinder body 212 located downstream in the gas flow direction is connected to the purifier 31. The air supply assembly 22 also conveys cold air to the downstream end of the inner cylinder body 212 to further dilute and cool the exhaust gas after air-cooling temperature reduction, so as to reduce the temperature of the exhaust gas below the emission temperature standard. The exhaust gas after forced temperature reduction is conveyed into the purifier 31 for final filtration treatment.

[0066] Optionally, as Figure 6 shown, the heat exchange tube 213 is a heat-conducting array microporous heat dissipation tube. The microporous material of the array has a high heat conductivity, which can achieve the effect of rapid heat dissipation.

[0067] In some embodiments, as Figure 4 shown, the air supply assembly 22 includes a second explosion-proof motor 221, an explosion-proof flame arrester 222, and an explosion-proof induced draft fan 223.

[0068] Among them, the second explosion-proof motor 221 is connected to the explosion-proof induced draft fan 223. An air supply port is provided on the outer box body 211. The air outlet of the explosion-proof induced draft fan 223 is communicated with the air supply port of the outer box body 211 through a pipeline. After the motor is started, power is transmitted to the explosion-proof induced draft fan 223 through the shaft, and the explosion-proof induced draft fan 223 sends cold air into the outer box body 211. The explosion-proof flame arrester 222 is arranged at the air inlet of the explosion-proof induced draft fan 223 to protect the normal operation of the fan and the safety of the mine.

[0069] Define the pipeline connecting the inner cylinder body 212 and the purifier 31 as the mixing pipe 214. The air outlet of the explosion-proof induced draft fan 223 is also communicated with the inner cavity of the mixing pipe 214 through a pipeline to send cold air into the mixing pipe 214, so that it is mixed with the tail gas after air-cooled heat exchange.

[0070] In some embodiments, as Figure 7 and Figure 8 shown, the purifier 31 includes a shell 311 and a flame arrestor net 312, a filter cloth 313, a filter bag 314, and a support mesh plate 315 arranged in the shell 311. The shell 311 is in a cylindrical shape, and the flame arrestor net 312, the filter cloth 313, the filter bag 314, and the support mesh plate 315 are arranged in sequence in the gas flow direction and from upstream to downstream.

[0071] Among them, the flame arrestor net 312 is a multi-layer microporous metal explosion-proof net, which not only plays a role in eliminating the possible flame in the tail gas, but also clamps the filter cloth 313 and the filter bag 314 together with the support mesh plate 315. The filter cloth 313 is composed of a flame-retardant fiber material to capture soot particles. The filter bag 314 is composed of cotton yarn packed with activated carbon for purification and odor removal.

[0072] It should be noted that the noise of the diesel engine 100 is the vibration generated by the impact of the high-speed discharge of gas at the exhaust outlet position. During the tail gas emission process, the heat exchange subsystem 2 cools down the tail gas and the volume shrinks, and the exhaust volume shrinks, thereby reducing the exhaust speed. The metal explosion-proof net, the filter fiber cloth, and the activated carbon filter bag 314 itself have the functions of sound absorption and buffering. Therefore, the explosion-proof diesel engine dry tail gas forced cooling and purification system of the embodiment of the present invention can also achieve noise reduction treatment of the tail gas.

[0073] Furthermore, as Figure 4 、 Figure 7and Figure 8 As shown in Figure 8 , a mounting seat 215 is provided at the port of the mixing pipe 214, and a hook-type detachable connection process is adopted between the mounting seat 215 and the housing 311.

[0074] It can be understood that the explosion-proof diesel engine dry tail gas forced cooling and purification system of the embodiment of the present invention has the advantages of simple maintenance, convenient replacement of filter components, high efficiency, and stable operation. Compared with the wet system in the related technology, the dry system of the embodiment of the present invention does not need to frequently replace consumables such as washing liquid and deal with blocked flame arresters. After working for a period of time, the combined tail gas purification components (purifier 31) can be replaced as a whole, or can be replaced independently, reducing the operation and maintenance costs.

[0075] In some embodiments, as Figure 1 shown in Figure 1 , the filtration subsystem 3 further includes a gas detection sensor 32 and a second temperature sensor 33, and the gas detection sensor 32 and the second temperature sensor 33 are arranged at the outlet of the purifier 31.

[0076] Among them, the gas detection sensor 32 is used to detect the pollutant content in the tail gas purified by the entire system, and the second temperature sensor 33 is used to detect the temperature of the tail gas purified by the entire system to ensure compliance with the emission standards. For example, when the pollutant content detected by the gas detection sensor 32 is high, the flow rate of the urea aqueous solution is increased, and when the temperature detected by the second temperature sensor 33 is high, the air supply flow rate is increased.

[0077] In some embodiments, as Figure 1 and Figure 9 shown in Figure 9 , the explosion-proof diesel engine 100 dry tail gas forced cooling and purification system further includes a control unit 4, and the control unit 4 is connected to the pretreatment subsystem 1, the heat exchange subsystem 2, and the filtration subsystem 3 to regulate the operating conditions of each subsystem according to the data uploaded by each subsystem.

[0078] It can be understood that the control unit 4 is the central processing unit for vehicle engine control, that is, the ECU control module. The control unit 4 is connected to the power supply 5, the first explosion-proof motor 13, the second explosion-proof motor 221, the electric control valve 15, the first temperature sensor 16, the second temperature sensor 33, and the gas detection sensor 32. The sensors monitor in real time and transmit signals to the control unit 4 for judgment, so as to more effectively control the flow rate of the urea aqueous solution and the air volume of heat exchange, and realize intelligent tail gas purification treatment.

[0079] In summary, for the explosion-proof diesel engine dry exhaust gas forced cooling and purification system according to the embodiments of the present invention, after the exhaust gas is first purified by oxidation reduction with an aqueous urea solution and pre-cooled, forced cooling is then carried out by means of air-cooled heat exchange and cold air dilution. While meeting the explosion-proof requirements such as the surface temperature and exhaust gas temperature in the coal mine, multi-layer filtration is finally carried out to achieve the purification of the exhaust gas of the diesel engine 100 and reduce the pollution of the air in the roadway.

[0080] The entire system has shown obvious advantages in terms of structural compactness, environmental protection performance, explosion-proof performance, noise reduction effect, and maintenance cost, providing an efficient, reliable, and economical solution for the exhaust gas treatment of the diesel engine 100 in the coal mine.

[0081] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 thus should not be construed as a limitation of the present invention.

[0082] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0085] In the present invention, the terms "an embodiment", "some embodiments", "exemplifications", "specific exemplifications", or "some exemplifications", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or exemplification are included in at least one embodiment or exemplification of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or exemplification. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or exemplifications in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or exemplifications described in this specification and the features of the different embodiments or exemplifications.

[0086] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. An explosion-proof diesel engine dry exhaust forced cooling and purification system, characterized in that: include: a pretreatment subsystem, the pretreatment subsystem comprising a purification pipe and a solution tank, the purification pipe being connected to the solution tank and an exhaust pipe of the diesel engine so that the exhaust gas discharged by the diesel engine flows into the purification pipe, and the urea aqueous solution transported by the solution tank is used to purify the exhaust gas and reduce the exhaust gas to a first temperature; A heat exchange subsystem, the heat exchange subsystem comprising a heat exchanger and an air supply assembly, the heat exchanger having a gas channel and a refrigerant channel, the heat exchanger being connected to the purification pipe and the air supply assembly, the air supply assembly being used to supply air into the refrigerant channel to remove heat from the exhaust gas at a first temperature flowing into the gas channel and reduce the exhaust gas to a second temperature, and the air supply assembly being used to supply air into the gas channel to dilute the exhaust gas at the second temperature and reduce it to a third temperature; The filtering subsystem includes a purifier, the purifier has a fire barrier layer, a carbon soot filter layer and a deodorization layer, and the purifier is connected to the heat exchanger so that the exhaust gas at the third temperature flows through the fire barrier layer, the carbon soot filter layer and the deodorization layer in sequence for treatment.

2. The explosion-proof diesel engine dry exhaust forced cooling and purification system according to claim 1 is characterized in that: The purification pipe includes a connecting section, a purification section and a diversion section which are connected in sequence. The connecting section is a corrugated pipe, and the connecting section is connected to the exhaust pipe of the diesel engine. The purification section is provided with a spray port. The inner cavity of the solution tank is connected to the spray port through a pipeline. The heat exchange subsystem and the filtering subsystem both have multiple and one-to-one correspondences, and the diversion section is connected to multiple heat exchangers of the heat exchange subsystem.

3. The explosion-proof diesel engine dry exhaust forced cooling and purification system according to claim 2 is characterized in that: The pretreatment subsystem further comprises a first explosion-proof motor, a variable flow pump and an electric control valve, wherein the first explosion-proof motor is connected to the variable flow pump, and the variable flow pump and the electric control valve are arranged on a pipeline between the solution tank and the purification pipe.

4. The explosion-proof diesel engine dry exhaust forced cooling and purification system according to claim 2, characterized in that: A first temperature sensor is provided on the peripheral wall of the diversion section of the purification pipe.

5. The explosion-proof diesel engine dry exhaust forced cooling and purification system according to claim 2, characterized in that: The heat exchanger includes an outer box, an inner cylinder and a heat exchange tube. The inner cylinder is arranged in the outer box. One end of the inner cylinder passes through the outer box and is connected to the diversion section of the purification tube via a pipeline. The other end of the inner cylinder passes through the outer box and is connected to the purifier via a pipeline. The inner cavity of the inner cylinder is the gas channel. The heat exchange tube passes through the inner cylinder. One end of the heat exchange tube is located in the outer box. The other end of the heat exchange tube passes through the outer box and is located outside the outer box. The inner cavity of the heat exchange tube is the refrigerant channel.

6. The explosion-proof diesel engine dry exhaust forced cooling and purification system according to claim 5, characterized in that: The air supply assembly includes a second explosion-proof motor, an explosion-proof flame arrester and an explosion-proof induced draft fan, the second explosion-proof motor is connected to the explosion-proof induced draft fan, the explosion-proof flame arrester is arranged at the air inlet of the explosion-proof induced draft fan, the outer box body is provided with an air supply port, the pipeline connecting the inner cylinder and the purifier is defined as a mixing tube, and the air outlet of the explosion-proof induced draft fan is connected to the air supply port and the inner cavity of the mixing tube through a pipeline.

7. The explosion-proof diesel engine dry exhaust forced cooling and purification system according to claim 6, characterized in that: The purifier includes a shell and a fire-blocking net, a filter cloth, a filter bag and a supporting mesh plate arranged in the shell. The shell is cylindrical, and the fire-blocking net, the filter cloth, the filter bag and the supporting mesh plate are arranged in sequence in the gas flow direction and from upstream to downstream.

8. The explosion-proof diesel engine dry exhaust forced cooling and purification system according to claim 7, characterized in that: A mounting seat is provided at the port of the mixing tube, and the mounting seat is detachably connected to the shell.

9. The explosion-proof diesel engine dry exhaust forced cooling and purification system according to claim 1, characterized in that: The filtering subsystem further includes a gas detection sensor and a second temperature sensor, wherein the gas detection sensor and the second temperature sensor are disposed at the outlet of the purifier.

10. The explosion-proof diesel engine dry exhaust forced cooling and purification system according to any one of claims 1 to 9, characterized in that: It also includes a control unit, which is connected to the pre-treatment subsystem, the heat exchange subsystem and the filtering subsystem to regulate the operating conditions of each subsystem according to the data uploaded by each subsystem.

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