Dry tail gas forced cooling and purifying system of explosion-proof diesel engine

Abstract

The invention discloses an explosion-proof diesel engine dry type tail gas forced cooling purification system which adopts a purification treatment means of combining a pretreatment subsystem, a heat exchange subsystem and a filtering subsystem, a urea aqueous solution is forcibly sprayed, nitrogen oxide in tail gas is oxidized and reduced, and the tail gas is cooled and purified. High-temperature tail gas enters the heat exchanger through the double exhaust pipes to be cooled, explosion prevention is conducted through forced ventilation cooling, and finally spark extinguishing, soot particulate matter capturing and activated carbon adsorption are conducted in sequence to complete tail gas purification. According to the system, a dry type structure is adopted, complex equipment and huge size brought by a wet type purification system in the related technology are abandoned, the whole system is more compact, the structure is reasonable, the weight is reduced, the transportation capacity of an underground transportation vehicle is effectively improved, the installation and deployment processes are more convenient and safer, and the cost is reduced. And the installation difficulty and cost are also reduced.

Description

Technical Field

[0001] The invention relates to the technical field of gas processing, and in particular to an explosion-proof diesel engine dry exhaust 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 difficulties in exhaust purification of explosion-proof diesel engines.

[0003] The temperature of the diesel engine body is high during operation, and the surface temperature of its exhaust pipe is usually high. The direct exhaust gas may ignite the gas in the tunnel. In addition, the exhaust gas contains nitrogen oxides, soot particles, etc., and excessive content will irritate the respiratory system of underground personnel and cause discomfort, or even lead to poisoning.

[0004] Therefore, the related art proposes to install an exhaust gas purification system on the diesel engine to reduce the exhaust gas temperature and separate the irritating gases in the exhaust gas. For example, the purification system adopts a wet purification structure of a water washing box, but it has the problem that the soot particles after water washing are combined with water and easily adhere to the flame arrester, resulting in a decrease in the ventilation efficiency of the flame arrester, and the exhaust gas purification effect is poor. In addition, during the discharge process, the water washing box will flush open the airway without sufficient contact with water and lose the water washing function. Summary of the invention

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

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

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

[0008] 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;

[0009] 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;

[0010] 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.

[0011] The explosion-proof diesel engine dry exhaust forced cooling and purification system of the embodiment of the present invention adopts a dry structure, abandoning the complex equipment and large size brought by the wet purification system in the related technology, making the whole system more compact, structurally reasonable, and reducing weight, effectively improving the transportation capacity of the underground transport vehicle, and making the installation and deployment process more convenient and safe, and reducing the difficulty and cost of installation.

[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 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 each have multiple and one-to-one correspondence, and the diversion section is connected to multiple heat exchangers of the heat exchange subsystem.

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

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

[0015] In some embodiments, 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, and the inner cavity of the heat exchange tube 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, 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.

[0017] In some embodiments, 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.

[0018] In some embodiments, a mounting seat is provided at the port of the mixing tube, and the mounting seat is detachably connected to the shell.

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

[0020] In some embodiments, the explosion-proof diesel engine dry exhaust forced cooling and purification system also includes a control unit, which is connected to the pretreatment subsystem, the heat exchange subsystem and the filtering subsystem to regulate the operating status of each subsystem according to the data uploaded by each subsystem. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0025] Figure 5 Schematic diagram of the structure of a heat exchanger according to an embodiment of the present invention.

[0026] Figure 6 It is an enlarged structural diagram of the heat exchange tube according to an embodiment of the present invention.

[0027] Figure 7 Schematic diagram of a purifier of a filtering subsystem according to an embodiment of the present invention.

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

[0029] Fig. 9 It is a schematic diagram of intelligent detection and control of an explosion-proof diesel engine dry exhaust 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-connecting section, 112-purification section, 113-diversion section, 114-spraying port, 12-solution tank, 13-first explosion-proof motor, 14-variable flow pump, 15-electrically controlled valve, 16-first temperature sensor,

[0033] 2-heat exchange subsystem, 21-heat exchanger, 211-outer box, 212-inner cylinder, 213-heat exchange tube, 214-mixing tube, 215-mounting seat, 22-air supply assembly, 221-second explosion-proof motor, 222-explosion-proof flame arrester, 223-explosion-proof induced draft fan,

[0034] 3-filter subsystem, 31-purifier, 311-housing, 312-fireproof net, 313-filter cloth, 314-filter bag, 315-supporting mesh plate, 32-gas detection sensor, 33-second temperature sensor,

[0035] 4- control unit, 5- power supply. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0037] The following describes the explosion-proof diesel engine dry exhaust forced cooling and purification system according to an embodiment of the present invention in conjunction with the accompanying drawings.

[0038] like Figures 1 to 9 As shown, the explosion-proof diesel engine dry exhaust forced cooling and purification system of the embodiment of the present invention includes: a pretreatment subsystem 1, a heat exchange subsystem 2 and a filtering 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 the exhaust gas is forced to be cooled, carbon soot particles are captured and odor is removed, thereby achieving exhaust gas purification treatment, making exhaust gas emissions more environmentally friendly, greatly reducing pollution to the air in the tunnel, and creating a safer and healthier working environment for underground workers.

[0039] Among them, Figures 1 to 3As shown, 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 by the diesel engine 100 flows into the purification pipe 11. The solution tank 12 is connected to the inner cavity of the purification pipe 11, and the solution tank 12 stores a urea aqueous solution to transport the urea aqueous solution into the purification pipe 11 to contact with the exhaust gas, and use the urea aqueous solution to oxidize and reduce nitrogen oxides in the exhaust gas, and reduce the exhaust gas to a first temperature.

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

[0041] like Figure 1 as well as Figures 4 to 6 As shown, the heat exchange subsystem 2 includes a heat exchanger 21 and an air supply component 22, and 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 is connected to the refrigerant channel of the heat exchanger 21, so that the air supply component 22 forces the gas in the low temperature environment into the refrigerant channel, so that the forced cold air and the pretreated exhaust gas are heat exchanged, and the exhaust gas at the first temperature is reduced to the second temperature. In addition, the air supply component 22 is also connected to the outlet of the gas channel of the heat exchanger 21, and the forced cold air is mixed with the exhaust gas at the second temperature, thereby playing a role in diluting the exhaust gas, and further reducing 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, the exhaust gas temperature is gradually reduced through multiple steps, each of which 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, which requires a large amount of coolant or energy to quickly reduce the high temperature exhaust gas, gradual cooling can reduce energy consumption.

[0043] In addition, the combination of forced air cooling heat exchange and cold air dilution can effectively improve the cooling efficiency of the exhaust gas, ensuring that the exhaust gas temperature drops below the emission temperature standard, thereby reducing the risk of underground fires and gas explosions.

[0044] like Figure 1 as well as Figure 7 and Figure 8As shown, the filtering subsystem 3 includes a purifier 31, which has a fire barrier layer, a soot filter layer and a deodorizing layer arranged in sequence from upstream to downstream along the gas flow direction. The purifier 31 is connected to the outlet of the gas channel of the heat exchanger 21, so that the exhaust gas after forced cooling and temperature reduction flows through the fire barrier layer, the soot filter layer and the deodorizing layer in sequence for treatment, and can be discharged into the lane normally after treatment.

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

[0046] It should be noted that, since some hydrocarbons in the exhaust gas will decompose in an unstable state under high temperature, the exhaust gas is cooled before filtering, and the soot particles are stable after cooling, which is convenient for the purifier 31 to filter. In addition, since the filter material is not easy to be used in a high temperature environment for a long time, the service life and performance of the filter material can be improved after the exhaust gas is cooled.

[0047] In summary, the explosion-proof diesel engine dry exhaust forced cooling and purification system of the embodiment of the present invention adopts a dry structure, abandoning the complex equipment and large size brought by the wet purification system in the related technology, making the entire system more compact, structurally reasonable, and reducing weight, effectively improving the transportation capacity of the underground transport vehicle, and making the installation and deployment process more convenient and safe, and reducing the difficulty and cost of installation.

[0048] In some embodiments, Figures 1 to 3 As shown, the purification pipe 11 includes a connecting section 111, a purification section 112 and a diversion section 113 which are connected in sequence, and the sections are detachably connected by flanges and bolts.

[0049] The connecting section 111 is a shock-absorbing bellows, which is connected to the exhaust pipe of the diesel engine 100 to facilitate the installation and maintenance of the purification system of the present invention. In addition, 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 vibration on the system.

[0050] A spray port 114 is provided on the pipe wall of the purification section 112, so that the inner cavity of the solution tank 12 is connected to the spray port 114 through a pipeline. The pipeline between the two is a urea spray pipe, and a nozzle is provided at the outlet of the urea spray pipe, so that the urea aqueous solution is sprayed into the purification section 112 through the urea spray pipe to achieve oxidation-reduction of nitrogen oxides in the exhaust gas.

[0051] The heat exchange subsystem 2 and the filtering subsystem 3 each have multiple and one-to-one correspondence, and the diversion section 113 is connected to the heat exchangers 21 of the multiple heat exchange subsystems 2. It can be understood that the diversion section 113 is composed of multiple pipe sections arranged in parallel, and the number of pipe sections of the diversion section 113 is the same as the number of the heat exchange subsystems 2, so that the pre-treated tail gas is diverted into the heat exchangers 21 of the multiple heat exchange subsystems 2, and the efficiency of subsequent forced cooling and filtering is improved by setting multiple purification lines in parallel.

[0052] Alternatively, if Figures 1 to 3 As shown, the diversion section 113 adopts a dual exhaust form, corresponding to the two heat exchange subsystems 2 and the filtering subsystem 3, which can adapt to the explosion-proof diesel engine 100 currently used in actual tunnel construction.

[0053] In some embodiments, Figures 1 to 3 As 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 connected to the power supply 5, the motor starts to rotate, and the rotation of the motor is connected to the pump components such as the impeller or piston of the variable flow pump 14 through the shaft, thereby transmitting the power of the motor to the pump.

[0055] The variable flow pump 14, driven by the first explosion-proof motor 13, draws the urea aqueous solution in the solution tank 12 into the pump, and then increases the pressure through the pump assembly 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 pump speed, impeller diameter or piston area. In addition, the flow rate of the fluid can also be controlled by adjusting the opening of the pump outlet valve (electrically controlled valve 15).

[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.

[0057] In some embodiments, Figure 1 and Figure 2 As shown, a first temperature sensor 16 is provided on the peripheral wall of the diversion 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 resistor surface temperature sensor, a thermocouple surface temperature sensor or a thermistor surface temperature sensor. The surrounding wall of the purification pipe 11 is wrapped with a heat insulating material, and the temperature of the exhaust gas is lowered by spraying a urea aqueous solution to ensure that the surface temperature of the purification pipe 11 is lower than 150°C to prevent fire and reduce the risk of thermal damage.

[0059] It is understandable that the first temperature sensor 16 monitors the surface temperature of the purification pipe 11 in real time. When the temperature is high, the flow rate of the urea aqueous 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 low, the flow rate of the urea aqueous solution is reduced to avoid excessive water content in the exhaust gas, which affects the filtering effect of the subsequent purifier 31 and avoids waste of solution.

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

[0061] The outer box body 211 is a rectangular parallelepiped box body, and the inner cylinder body 212 is arranged inside the outer box body 211 along the length direction of the outer box body 211. The two ends of the inner cylinder body 212 respectively penetrate the two end walls of the outer box body 211 in the length direction, and the two ends of the inner cylinder body 212 are in a constricted shape.

[0062] One end of the inner cylinder 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 212, that is, the inner cavity of the inner cylinder 212 is the gas channel of the above-mentioned heat exchanger 21.

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

[0064] Thus, the air supply component 22 delivers cold air into the box, 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 212 to achieve cooling.

[0065] The end of the inner cylinder 212 located downstream in the gas flow direction is connected to the purifier 31, and the air supply component 22 also delivers cold air to the downstream end of the inner cylinder 212 to further dilute and cool the exhaust gas after air cooling, so as to reduce the temperature of the exhaust gas to below the emission temperature standard. The exhaust gas after forced cooling is delivered to the purifier 31 for final filtering.

[0066] Alternatively, if Figure 6 As shown, the heat exchange tube 213 is a heat-conducting array microporous heat dissipation tube. The microporous material of the array has a high thermal conductivity and can achieve a rapid heat dissipation effect.

[0067] In some embodiments, Figure 4 As 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, and an air supply port is provided on the outer box 211. The air outlet of the explosion-proof induced draft fan 223 is connected to the air supply port of the outer box 211 through a pipeline. After the motor is started, the 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 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] The pipeline connecting the inner cylinder 212 and the purifier 31 is defined as a mixing tube 214, and the air outlet of the explosion-proof induced draft fan 223 is also connected to the inner cavity of the mixing tube 214 through the pipeline to send cold air into the mixing tube 214 to mix with the exhaust gas after air-cooling heat exchange.

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

[0071] The fire-blocking net 312 is a multi-layer microporous metal explosion-proof net, which not only eliminates the flames that may exist in the exhaust gas, but also sandwiches the filter cloth 313 and the filter bag 314 together with the supporting mesh plate 315. The filter cloth 313 is composed of flame-retardant fiber material to capture carbon smoke particles. The filter bag 314 is composed of cotton yarn wrapped activated carbon, which is used for purification and deodorization.

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

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

[0074] It can be understood that the explosion-proof diesel engine dry exhaust forced cooling 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 art, 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 exhaust purification component (purifier 31) can be replaced as a whole or independently, which reduces the operation and maintenance costs.

[0075] In some embodiments, Figure 1 As shown, the filtering 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] The gas detection sensor 32 is used to detect the pollutant content in the exhaust gas after being purified by the entire system, and the second temperature sensor 33 is used to detect the temperature of the exhaust gas after being purified by the entire system to ensure that the emission standards are met. 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 flow rate is increased.

[0077] In some embodiments, Figure 1 and Fig. 9 As shown, the explosion-proof diesel engine 100 dry exhaust forced cooling and purification system also includes a control unit 4, which is connected to the pretreatment subsystem 1, the heat exchange subsystem 2 and the filtering subsystem 3 to regulate the operating status of each subsystem according to the data uploaded by each subsystem.

[0078] It can be understood that the control unit 4 is a central processing unit for vehicle engine control, that is, an 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 sensor monitors in real time and transmits the signal 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 the heat exchange, and realize intelligent exhaust gas purification.

[0079] In summary, the explosion-proof diesel engine dry exhaust forced cooling and purification system of the embodiment of the present invention first purifies the exhaust gas through urea aqueous solution oxidation-reduction purification and pre-cooling, and then uses air-cooled heat exchange and cold air dilution to force cooling, while meeting the explosion-proof requirements such as the underground surface temperature and exhaust temperature of the coal mine, and finally performs multi-layer filtration to achieve exhaust purification of the diesel engine 100 and reduce pollution to the air in the tunnel.

[0080] The whole system has shown obvious advantages in terms of compact structure, 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 diesel engines 100 in coal mines.

[0081] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

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

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, 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 and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

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

[0086] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection 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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