In-situ activation type anti-explosion diesel vehicle tail gas purification device

Abstract

The invention relates to the technical field of tail gas treatment, in particular to an in-situ activation type anti-explosion diesel vehicle tail gas purification device which comprises a diffusion chamber, a purification core, an exhaust shrinkage chamber, an in-situ heating activation device, a heat insulation layer and a cooling water jacket. A catalytic oxidation method is adopted, CO oxidation reaction activation energy is reduced, toxic CO is converted into non-toxic CO2 through the temperature of tail gas, and CO gas is efficiently removed; the purification material adopted by the invention is a Cu / Ce supported catalyst, the catalyst is low in light-off temperature and high in catalytic activity, and a very strong metal-carrier interaction exists between a CuO active species and a CeO2 carrier, so that the adsorption activation of O2 and CO can be promoted, and the catalytic activity and the water resistance are improved; the in-situ heating activation device enables the purification device to be more conveniently and repeatedly used, activation can be completed without taking out the purification core, and the cost is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas treatment, and in particular to an in-situ activated explosion-proof diesel vehicle tail gas purification device. Background Art

[0002] The engines of explosion-proof diesel vehicles for mining have undergone explosion-proof modification, and the exhaust contains a large amount of solid particles and CO toxic gases. These toxic substances greatly endanger the life and health of workers in the confined space underground. The "Coal Mine Safety Regulations" clearly stipulate that the CO concentration in the air underground shall not exceed 24ppm, and the exhaust containing a large amount of CO produced by high-power explosion-proof diesel vehicles during operation is one of the reasons for the excessive CO in the mine.

[0003] At present, the exhaust purifiers on the market use honeycomb ceramics to purify carbon black particles. They have a small dirt holding capacity, are easy to clog, and have a complex and difficult regeneration process. They cannot eliminate solid particles and CO gas at the same time. They need to be used in combination with multiple purifiers. They are large in size, high in cost, and low in portability. They are not conducive to maintenance, replacement, and recycling, and are not suitable for mine diesel vehicle exhaust purification. Therefore, it is urgent to design an efficient exhaust purification device for explosion-proof diesel vehicles in coal mines, which can not only achieve efficient elimination of exhaust CO, but also meet the requirements of high portability, easy maintenance, easy recycling, and cost saving. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an in-situ activated explosion-proof diesel vehicle exhaust purification device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An in-situ activated explosion-proof diesel vehicle exhaust purification device comprises a diffusion chamber, a purification core, an exhaust contraction chamber, an in-situ heating activation device, a heat insulation layer and a cooling water jacket;

[0007] The diffusion chamber, the purification core and the exhaust contraction chamber are connected in sequence from top to bottom;

[0008] The in-situ heating activation device is arranged on the outside of the purification core, the heat insulation layer is wrapped on the outside of the in-situ heating activation device, and the cooling water jacket is wrapped on the outside of the air intake diffusion chamber, the heat insulation layer and the exhaust contraction chamber.

[0009] Compared with the prior art, the exhaust gas purification of the present application is based on the principle of catalytic oxidation. The Cu / Ce catalyst powder is evenly coated on the honeycomb metal substrate by the dip coating method to construct a Cu / Ce monolithic catalyst. The exhaust gas passes through the Cu / Ce monolithic catalyst. Under the action of the catalyst coating, the heat carried by the exhaust gas itself is used to increase the activity of the catalyst, oxidize CO to CO2, and achieve efficient purification of exhaust gas CO. A low-temperature exhaust gas CO purification device is constructed with the Cu / Ce monolithic catalyst as the purification core. The device includes an intake diffusion chamber, a purification core, an exhaust contraction chamber, an in-situ heating activation device, a thermal insulation layer, and a cooling water jacket. The exhaust gas enters the intake diffusion chamber through the air inlet and is evenly diffused to the cross section of the purification core. After the exhaust gas flows through the monolithic catalyst, it is discharged through the exhaust contraction chamber and the exhaust port. The outer surface of the device is equipped with a cooling water jacket for water circulation cooling, and the surface temperature does not exceed 150°C, meeting the MT990 explosion-proof requirements; an in-situ heating activation device is provided on the outside of the purification core to facilitate the reuse of the purification core after activation, and the purification core does not need to be disassembled; the integral catalyst reaches the temperature of optimal activity under the action of exhaust gas heat, thereby achieving efficient purification of CO from exhaust gas of mining explosion-proof vehicles.

[0010] Preferably, the diffusion chamber includes a fixed flange, a diverter hood and a truncated cone sleeve; the diverter hood is made of a perforated mesh plate, and the diverter hood is fixed to the air inlet end of the truncated cone sleeve; the small diameter end of the truncated cone sleeve is welded and fixed to the fixed flange, and the other end of the truncated cone sleeve is fixedly connected to the cooling water jacket.

[0011] Furthermore, the firmness of the connection between the fixed flange, the diverter cover and the truncated cone sleeve is fully ensured, and the other end of the truncated cone sleeve is welded to the inner ring of the annular water trough. During welding, the sealing is ensured to avoid leakage.

[0012] Preferably, the purification core includes an integral catalyst and a supporting shell, and the integral catalyst adopts a dip coating method to coat the Cu / Ce catalyst on the honeycomb metal to form a catalyst coating; the Cu / Ce catalyst is a supported catalyst, which is prepared by a hydrothermal method and an impregnation method, and the carrier is cerium oxide, and the active component is a copper species, which has the advantages of low ignition temperature, high tolerance and strong stability; the honeycomb metal carrier is cylindrical and consists of a plurality of parallel small triangular channels.

[0013] Furthermore, the surface area can be effectively increased through a plurality of tiny triangular holes, so that the exhaust gas and the integral catalyst can be better contacted, so that the exhaust gas and the catalyst can react better.

[0014] Preferably, the exhaust contraction chamber comprises a truncated cone sleeve and a fixed flange, the small diameter end of the truncated cone sleeve is welded and fixed to the fixed flange, and the other end of the truncated cone sleeve is fixedly connected to the cooling water jacket.

[0015] Furthermore, the other end of the truncated cone sleeve is welded and fixed to the inner ring of the annular water groove, which can fully ensure the stability of the exhaust contraction chamber.

[0016] Preferably, the in-situ heating and activation device adopts an embedded electric heating plate, and an aviation plug is provided inside the in-situ heating and activation device, and the aviation plug is arranged through the cooling water jacket.

[0017] Furthermore, power is supplied through an aviation plug arranged on the side of the cooling water jacket and wrapped around the outside of the purification core; the in-situ heating activation device can be connected to a temperature-controlled power distribution cabinet to achieve temperature-controlled heating.

[0018] Preferably, the thermal insulation layer is a cavity structure arranged between the cooling water jacket and the in-situ heating activation device, and a thermal insulation material is arranged in the cavity structure. A fixing ring is arranged in the thermal insulation layer, and the fixing ring is fixedly connected to the cooling water jacket.

[0019] Furthermore, the heat preservation effect can be effectively guaranteed; the in-situ heating activation device is not started during the exhaust gas purification operation, and after the purification operation is completed, the device is removed and transferred to the ground to be powered on for activation.

[0020] Preferably, the cooling water jacket comprises an annular water trough, an annular water trough, a cooling water jacket inner shell, a cooling water jacket outer shell, a water inlet pagoda joint and a water outlet pagoda joint;

[0021] The outer shell of the cooling water jacket is formed by two truncated cone-shaped sleeves welded to the upper and lower ends of the metal cylinder respectively; the top end of the outer shell of the cooling water jacket is welded to the fixed flange, and the bottom end of the outer shell of the cooling water jacket is welded to the fixed flange; the annular water groove and the annular water groove are welded to the two ends of the inner shell of the cooling water jacket respectively; the water inlet pagoda joint and the water outlet pagoda joint are arranged through the upper and lower ends of the outer shell of the cooling water jacket.

[0022] Furthermore, the water inlet pagoda joint and the water outlet pagoda joint are connected to the circulating cooling water to fully ensure the cooling effect, and the sealing effect is ensured by welding.

[0023] Preferably, the fixing ring and the inner shell of the cooling water jacket are fixed by welding.

[0024] Preferably, the other end of the truncated cone sleeve is fixed to the inner ring of the annular water channel by welding.

[0025] Preferably, the monolithic catalyst preparation process is as follows:

[0026] S1: dissolving a cerium salt in deionized water to obtain a cerium salt solution, dissolving a precipitant in deionized water to obtain a precipitant solution, adding the cerium salt solution dropwise into the precipitant solution and stirring continuously until a uniformly mixed slurry is obtained, then transferring the slurry to a stainless steel reactor for hydrothermal reaction, and after the reaction is completed, filtering, washing, drying, and calcining to obtain a cerium oxide carrier;

[0027] S2: dissolving copper salt in deionized water and stirring to obtain a clear solution, uniformly dispersing the cerium oxide support prepared in step S1 in the mixed solution, continuously heating under constant stirring until all water is evaporated, and obtaining a Cu / Ce catalyst after drying and calcining;

[0028] S3: Grind and sieve the Cu / Ce catalyst powder prepared in step S2, mix it with deionized water, glacial acetic acid, polyvinyl alcohol and aluminum sol in a certain proportion, and then ball-mill it into slurry. Put the honeycomb metal substrate into the slurry and soak it for a certain period of time. Then, take out the honeycomb metal substrate at a constant speed, blow off the excess slurry in the pores with compressed air, and finally dry and calcine the honeycomb metal substrate coated with the catalyst slurry to obtain an integral catalyst.

[0029] Furthermore, the cerium salt is cerium nitrate hexahydrate, the precipitant is sodium hydroxide, and the copper salt is copper nitrate trihydrate; the concentration of the cerium salt solution is 0.4 mol / L, and the concentration of the precipitant solution is 0.01-6 mol / L; the hydrothermal reaction conditions are 100-180°C, 10-24h, the drying conditions are 80°C, 12h, and the calcination conditions are 400-500°C, 4-5h; the mass ratio between Cu and CeO2 carrier in the Cu / Ce catalyst is 0.05-0.08:1, the Al2O3 content of the aluminum sol is 20wt%, the mass ratio of the powder catalyst and the Al2O3 colloid is 4-5wt%, the mass ratio of the Al2O3 colloid and polyvinyl alcohol is 2.46wt%, the drying conditions of the integral catalyst are 80°C, 12h, and the calcination conditions are 200-300°C.

[0030] The beneficial effects of the present invention are:

[0031] 1. Ensure the firmness of the connection between the fixed flange, the diverter cover and the truncated cone sleeve, and weld the other end of the truncated cone sleeve to the inner ring of the annular water trough. During welding, ensure the sealing to avoid leakage;

[0032] 2. Multiple small triangular channels can effectively increase the surface area, allowing the exhaust gas to better contact the monolithic catalyst, so that the exhaust gas and the catalyst can react better;

[0033] 3. The other end of the truncated cone sleeve is welded and fixed to the inner ring of the annular water groove, which can fully ensure the stability of the exhaust contraction chamber;

[0034] 4. Power is supplied through the aviation plug installed on the side of the cooling water jacket, which is wrapped around the outside of the purification core; the in-situ heating activation device can be connected to the temperature control distribution cabinet to achieve temperature control heating;

[0035] 5. The in-situ heating activation device is not started during the exhaust gas purification operation. After the purification operation is completed, the device is removed and transferred to the ground and powered on for activation;

[0036] 6. The water inlet and outlet pagoda joints are connected to the circulating cooling water to fully ensure the cooling effect, and the sealing effect is ensured by welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the in-situ activated explosion-proof diesel vehicle exhaust purification device of the present invention;

[0038] Figure 2 This is a schematic structural diagram of the in-situ activated explosion-proof diesel vehicle exhaust purification device of the present invention;

[0039] Figure 3 This is a schematic diagram of the purification core;

[0040] Figure 4 is a schematic diagram of the diffuser;

[0041] Figure 5 This is a schematic diagram of the water flow position of the cooling water jacket;

[0042] Figure 6 This is a schematic diagram of the water tank;

[0043] Figure 7 This is a schematic diagram of the CO purification efficiency of explosion-proof diesel vehicle exhaust;

[0044] In the figure: 1 diffusion chamber, 11 fixed flange, 12 diverter cover, 13 truncated cone sleeve, 2 purification core, 21 integral catalyst, 22 support shell, 3 exhaust contraction chamber, 31 truncated cone sleeve, 32 fixed flange, 4 in-situ heating activation device, 41 aviation plug, 5 thermal insulation layer, 51 fixed ring, 6 cooling water jacket, 61 annular water trough, 62 annular water trough, 63 cooling water jacket inner shell, 64 cooling water jacket outer shell, 65 water inlet pagoda joint, 66 water outlet pagoda joint. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0046] Reference Figure 1-7, an in-situ activated explosion-proof diesel vehicle exhaust purification device, an intake diffusion chamber 1, a purification core 2, an exhaust contraction chamber 3, an in-situ heating activation device 4, a thermal insulation layer 5, and a cooling water jacket 6. The intake diffusion chamber 1, the purification core 2, and the exhaust contraction chamber 3 are connected in sequence, the in-situ heating activation device 4 is arranged on the outside of the purification core 2, the thermal insulation layer 5 is wrapped on the outside of the in-situ heating activation device 4, and the cooling water jacket 6 is wrapped on the outside of the intake diffusion chamber 1, the thermal insulation layer 5, and the exhaust contraction chamber 3.

[0047] The exhaust gas purification device is based on the principle of catalytic oxidation. The Cu / Ce catalyst powder is evenly coated on the honeycomb metal substrate by the dip coating method to construct a Cu / Ce monolithic catalyst. The exhaust gas passes through the Cu / Ce monolithic catalyst. Under the action of the catalyst coating, the heat carried by the exhaust gas itself is used to increase the activity of the catalyst, oxidizing CO to CO2, and achieving efficient purification of exhaust gas CO. A low-temperature exhaust gas CO purification device is constructed with the Cu / Ce monolithic catalyst as the purification core. The device includes an intake diffusion chamber, a purification core, an exhaust contraction chamber, an in-situ heating activation device, a thermal insulation layer, and a cooling water jacket. The exhaust gas enters the intake diffusion chamber through the air inlet and is evenly diffused to the cross section of the purification core. After the exhaust gas flows through the monolithic catalyst, it is discharged through the exhaust contraction chamber and the exhaust port. The outer surface of the device is equipped with a cooling water jacket for water circulation cooling, and the surface temperature does not exceed 150°C, meeting the MT990 explosion-proof requirements; an in-situ heating activation device is provided on the outside of the purification core to facilitate the reuse of the purification core after activation, and the purification core does not need to be disassembled; the integral catalyst reaches the temperature of optimal activity under the action of exhaust gas heat, thereby achieving efficient purification of CO from exhaust gas of mining explosion-proof vehicles.

[0048] The cerium salt is cerium nitrate hexahydrate, the precipitant is sodium hydroxide, and the copper salt is copper nitrate trihydrate; the concentration of the cerium salt solution is 0.4 mol / L, and the concentration of the precipitant solution is 0.01-6 mol / L; the hydrothermal reaction conditions are 100-180°C, 10-24h, the drying conditions are 80°C, 12h, and the roasting conditions are 400-500°C, 4-5h; the mass ratio between Cu and CeO2 carrier in the Cu / Ce catalyst is 0.05-0.08:1, the Al2O3 content of the aluminum sol is 20wt%, the mass ratio of the powder catalyst and the Al2O3 colloid is 4-5wt%, the mass ratio of the Al2O3 colloid and the polyvinyl alcohol is 2.46wt%, the drying conditions of the integral catalyst are 80°C, 12h, and the roasting conditions are 200-300°C.

[0049] like Figure 2 and Figure 4 As shown, the air intake diffusion chamber 1 includes a fixed flange 11, a diverter cover 12, and a truncated cone sleeve 13. The diverter cover 12 is made of a perforated mesh plate and is fixed to the air inlet end of the truncated cone sleeve 13. The small diameter end of the truncated cone sleeve 13 is welded to the fixed flange 11, and the other end is welded to the inner circle of the annular water channel 61.

[0050] like Figure 2 and Figure 3 As shown, the purification core 2 includes an integral catalyst 21 and a supporting shell 22. The integral catalyst 21 is coated with a Cu / Ce catalyst on a honeycomb metal by a dip coating method to form a catalyst coating. The Cu / Ce catalyst is a supported catalyst, which is prepared by a hydrothermal method and an impregnation method. The carrier is cerium oxide, and the active component is a copper species. It has the advantages of low ignition temperature, high tolerance, and strong stability. The honeycomb metal carrier is cylindrical and consists of a plurality of parallel small triangular channels. The preparation process of the integral catalyst 21 is as follows:

[0051] S1: dissolving a cerium salt in deionized water to obtain a cerium salt solution, dissolving a precipitant in deionized water to obtain a precipitant solution, adding the cerium salt solution dropwise into the precipitant solution and stirring continuously until a uniformly mixed slurry is obtained, then transferring the slurry to a stainless steel reactor for hydrothermal reaction, and after the reaction is completed, filtering, washing, drying, and calcining to obtain a cerium oxide carrier;

[0052] S2: dissolving copper salt in deionized water and stirring to obtain a clear solution, uniformly dispersing the cerium oxide support prepared in step S1 in the mixed solution, continuously heating under constant stirring until all water is evaporated, and obtaining a Cu / Ce catalyst after drying and calcining;

[0053] S3: Grind and sieve the Cu / Ce catalyst powder prepared in step S2, mix it with deionized water, glacial acetic acid, polyvinyl alcohol and aluminum sol in a certain proportion, and then ball-mill it into slurry. Put the honeycomb metal substrate into the slurry and soak it for a certain period of time. Then, take out the honeycomb metal substrate at a constant speed, blow off the excess slurry in the pores with compressed air, and finally dry and calcine the honeycomb metal substrate coated with the catalyst slurry to obtain an integral catalyst.

[0054] The cerium salt is cerium nitrate hexahydrate, the precipitant is sodium hydroxide, and the copper salt is copper nitrate trihydrate; the concentration of the cerium salt solution is 0.4 mol / L, and the concentration of the precipitant solution is 0.01-6 mol / L; the hydrothermal reaction conditions are 100-180°C, 10-24h, the drying conditions are 80°C, 12h, and the roasting conditions are 400-500°C, 4-5h; the mass ratio between Cu and CeO2 carrier in the Cu / Ce catalyst is 0.05-0.08:1, the Al2O3 content of the aluminum sol is 20wt%, the mass ratio of the powder catalyst and the Al2O3 colloid is 4-5wt%, the mass ratio of the Al2O3 colloid and the polyvinyl alcohol is 2.46wt%, the drying conditions of the integral catalyst are 80°C, 12h, and the roasting conditions are 200-300°C.

[0055] like Figure 2As shown, the exhaust contraction chamber 3 includes a truncated cone sleeve 31 and a fixed flange 32 . The small diameter end of the truncated cone sleeve 31 is welded to the fixed flange 32 , and the other end is welded to the inner circle of the annular water groove 62 .

[0056] like Figure 2 As shown, the in-situ heating activation device 4 is an embedded electric heating plate, which is powered by an aviation plug 41 arranged on the side of the cooling water jacket 6 and wrapped around the outside of the purification core 2; the in-situ heating activation device 4 can be connected to a temperature control distribution cabinet to achieve temperature control heating.

[0057] like Figure 2 As shown, the heat insulation layer 5 is a cavity structure arranged between the cooling water jacket 6 and the in-situ heating activation device 4, with a fixing ring 51 inside for fixing the inner shell 63 of the cooling water jacket during welding, and the inside is wrapped with silica nano-aerosol felt.

[0058] like Figure 2 and Figure 5 As shown, the cooling water jacket 6 includes an annular water groove 61, an annular water groove 62, a cooling water jacket inner shell 63, a cooling water jacket outer shell 64, a water inlet pagoda joint 65, and a water outlet pagoda joint 66. The cooling water jacket outer shell 64 is formed by two truncated cone sleeves welded to the upper and lower ends of the metal cylinder respectively. The top of the cooling water jacket outer shell 64 is welded to the fixed flange 11, and the bottom is welded to the fixed flange 32; the annular water groove 61 and the annular water groove 62 are respectively welded to the two ends of the cooling water jacket inner shell 63 to form an independent sealed cavity; the cooling water jacket 6 can be connected to the circulating cooling water through the water inlet pagoda joint 65 and the water outlet pagoda joint 66.

[0059] The in-situ activated explosion-proof diesel vehicle exhaust purification device is installed in the exhaust tail pipe of the explosion-proof diesel vehicle. The metal graphite spiral wound gasket is clamped by the flange to achieve sealing and fixing. When the explosion-proof diesel vehicle is in operation, the exhaust gas enters the intake diffusion chamber 1 through the air inlet, and is evenly diffused to the cross section of the purification core 2. The exhaust gas flows through the integral catalyst 21, and the heat carried by the exhaust gas itself is used to increase the activity of the catalyst, oxidizing CO to CO2, and then passing through the exhaust contraction chamber 3 and discharged through the exhaust port. During this period, the cooling water jacket 6 on the outer surface of the device is cooled by water circulation, and the surface temperature does not exceed 150°C, meeting the MT990 explosion-proof requirements. During maintenance, the in-situ activated explosion-proof diesel vehicle exhaust purification device is removed, transferred to the ground, and connected to the temperature control distribution cabinet through the aviation plug 41 for activation. First, it rises from room temperature to 400°C, and then rises to 600°C after a constant temperature of 1 hour, and the temperature is kept constant for two hours. The power is disconnected to complete the activation.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An in-situ activated explosion-proof diesel vehicle exhaust purification device, comprising a diffusion chamber (1), a purification core (2), an exhaust contraction chamber (3), an in-situ heating activation device (4), a heat insulation layer (5) and a cooling water jacket (6); characterized in that: The diffusion chamber (1), the purification core (2) and the exhaust contraction chamber (3) are connected in sequence from top to bottom; The in-situ heating activation device (4) is arranged on the outside of the purification core (2), the heat insulation layer (5) is wrapped on the outside of the in-situ heating activation device (4), and the cooling water jacket (6) is wrapped on the outside of the air intake diffusion chamber (1), the heat insulation layer (5) and the exhaust contraction chamber (3).

2. The in-situ activated explosion-proof diesel vehicle exhaust purification device according to claim 1, characterized in that: The diffusion chamber (1) comprises a fixed flange (11), a flow divider (12) and a truncated cone sleeve (13); the flow divider (12) is made of a perforated mesh plate, and the flow divider (12) is fixed to the air inlet end of the truncated cone sleeve (13); the small diameter end of the truncated cone sleeve (13) is welded and fixed to the fixed flange (11), and the other end of the truncated cone sleeve (13) is fixedly connected to the cooling water jacket (6).

3. The in-situ activated explosion-proof diesel vehicle exhaust purification device according to claim 2, characterized in that: The purification core (2) comprises an integral catalyst (21) and a supporting shell (22), wherein the integral catalyst (21) is formed by coating a Cu / Ce catalyst on a honeycomb metal by a dip coating method to form a catalyst coating; The Cu / Ce catalyst is a supported catalyst, which is prepared by hydrothermal method and impregnation method. The carrier is cerium oxide and the active component is copper species. It has the advantages of low ignition temperature, high tolerance and strong stability. The honeycomb metal carrier is cylindrical and consists of multiple parallel small triangular channels.

4. The in-situ activated explosion-proof diesel vehicle exhaust purification device according to claim 3 is characterized in that: The exhaust contraction chamber (3) comprises a truncated cone sleeve (31) and a fixed flange (32); the small diameter end of the truncated cone sleeve (31) is welded and fixed to the fixed flange (32); and the other end of the truncated cone sleeve (31) is fixedly connected to the cooling water jacket (6).

5. The in-situ activated explosion-proof diesel vehicle exhaust purification device according to claim 4, characterized in that: The in-situ heating and activation device (4) adopts an embedded electric heating plate. An aviation plug (41) is provided inside the in-situ heating and activation device (4). The aviation plug (41) is arranged through the cooling water jacket (6).

6. The in-situ activated explosion-proof diesel vehicle exhaust purification device according to claim 5, characterized in that: The heat insulating layer (5) is a cavity structure arranged between the cooling water jacket (6) and the in-situ heating activation device (4), and a heat insulating material is arranged in the cavity structure. A fixing ring (51) is arranged in the heat insulating layer (5), and the fixing ring (51) and the cooling water jacket (6) are fixedly connected.

7. The in-situ activated explosion-proof diesel vehicle exhaust purification device according to claim 6, characterized in that: The cooling water jacket (6) comprises an annular water trough (61), an annular water trough (62), a cooling water jacket inner shell (63), a cooling water jacket outer shell (64), a water inlet pagoda joint (65) and a water outlet pagoda joint (66); The cooling water jacket outer shell (64) is formed by two truncated cone-shaped sleeves respectively welded to the upper and lower ends of a metal cylinder; the top end of the cooling water jacket outer shell (64) is welded to a fixed flange (11), and the bottom end of the cooling water jacket outer shell (64) is welded to a fixed flange (32); the annular water groove (61) and the annular water groove (62) are respectively welded to the two ends of the cooling water jacket inner shell (63); the water inlet pagoda joint (65) and the water outlet pagoda joint (66) are arranged through the upper and lower ends of the cooling water jacket outer shell (64).

8. The in-situ activated explosion-proof diesel vehicle exhaust purification device according to claim 7, characterized in that: The fixing ring (51) and the cooling water jacket inner shell (63) are fixed by welding.

9. The in-situ activated explosion-proof diesel vehicle exhaust purification device according to claim 8, characterized in that: The other end of the truncated cone sleeve (31) is welded and fixed to the inner ring of the annular water channel (62).

10. The in-situ activated explosion-proof diesel vehicle exhaust purification device according to claim 3, characterized in that: The preparation process of the monolithic catalyst (21) is as follows: S1: dissolving a cerium salt in deionized water to obtain a cerium salt solution, dissolving a precipitant in deionized water to obtain a precipitant solution, adding the cerium salt solution dropwise into the precipitant solution and stirring continuously until a uniformly mixed slurry is obtained, then transferring the slurry to a stainless steel reactor for hydrothermal reaction, and after the reaction is completed, filtering, washing, drying, and calcining to obtain a cerium oxide carrier; S2: dissolving copper salt in deionized water and stirring to obtain a clear solution, uniformly dispersing the cerium oxide support prepared in step S1 in the mixed solution, continuously heating under constant stirring until all water is evaporated, and obtaining a Cu / Ce catalyst after drying and calcining; S3: Grind and sieve the Cu / Ce catalyst powder prepared in step S2, mix it with deionized water, glacial acetic acid, polyvinyl alcohol and aluminum sol in a certain proportion, and then ball-mill it into slurry. Put the honeycomb metal substrate into the slurry and soak it for a certain period of time. Then, take out the honeycomb metal substrate at a constant speed, blow off the excess slurry in the pores with compressed air, and finally dry and calcine the honeycomb metal substrate coated with the catalyst slurry to obtain an integral catalyst.

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