Catalyst carrier mounting device and engine tail gas purification treatment system

Abstract

The utility model provides a catalyst carrier mounting device, which relates to the technical field of engine tests, and is characterized in that a movable frame assembly can be integrally taken out from a box body base assembly; the box body base assembly comprises a pore plate and a back frame, and a plurality of via holes are formed in the pore plate; the movable frame assembly comprises a supporting frame, carriers and a pressing mechanism, the multiple carriers are installed on the supporting frame, each carrier corresponds to one via hole in the pore plate, and the carriers can axially move relative to the supporting frame; the pressing mechanism is located at the rear end of the carrier and used for pressing the carrier on the surface of the pore plate. When blowing is needed, the movable frame can be taken out of the box body base, all the carriers can be pulled out at a time, the carriers are blown and cleaned outside the box body base, the carriers do not need to be disassembled one by one, the carriers can be rapidly and conveniently blown, and the maintenance operation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine tests, and further relates to a catalyst carrier installation device and an engine exhaust gas purification and treatment system. Background Technique

[0002] The engine exhaust gas purification and treatment system is used to treat the exhaust gas generated by the diesel engine test bench, reduce the particulate matter, carbon monoxide, hydrocarbons and nitrogen oxides in the exhaust gas. The system adopts the form of DOC (Diesel Oxidation Catalyst) + SCR (Selective Catalytic Reduction technology). The DOC is used to reduce the indicators such as particulate matter, hydrocarbons and carbon monoxide; the SCR is used to reduce the nitrogen oxide index. To ensure the efficient, stable and continuous operation of the system, the system is configured with heaters, heat reflux pipelines, exhaust fans, control systems, etc. to improve the overall efficiency of the system. With the increasingly strict environmental protection regulations, at present, the exhaust gas emitted from the engine test bench in the engine laboratory mostly adopts the operation mode of centralized treatment and centralized discharge to eliminate the harmful components in the exhaust gas to the greatest extent.

[0003] The catalytic carriers include DOC and SCR, which are respectively installed in two packages. During operation, the inside of the smoke pipe is in a negative pressure state. The particulate matter in the exhaust gas and a small amount of external dust are blown into the honeycomb carrier together, causing pollution to the carrier, increasing the pressure difference before and after the carrier, increasing the fan load and energy consumption, and reducing the treatment effect. Therefore, it is necessary to disassemble and purge the carrier for maintenance irregularly according to the equipment status. The maintenance of the carrier must be carried out when the temperature in the system reactor drops below 60°C, and it can only be carried out by professional technicians after shutting down and cutting off the power supply. The maintenance cycle is short, the time consumption is long, the workload is large, and it has a great impact on the test progress.

[0004] The current maintenance plans are divided into two types. One is that after the system cools down, maintenance personnel enter the encapsulation and use a high-power vacuum cleaner to clean each carrier one by one. The other plan is to open the encapsulation, take out the carriers one by one, and then transport them to an open area outdoors for purging with compressed air (DOC and SCR carrier disassembly and assembly method: there is a locking bolt at the top and bottom of each layer of the carrier. Loosen the compression nut, about 2 cm, and then push the bolt forward to loosen the serrated pressure plate pressing on the upper and lower frames of the carrier. The carrier on that layer can be pulled out and removed outward, and the carriers are taken out one by one from the outside to the inside). The first of these plans is relatively simple, but the cleaning effect is poor, and the filter of the vacuum cleaner is extremely easy to clog during the cleaning process, and the vacuum cleaner needs to be cleaned repeatedly during the process. The second plan has a better purging effect, but it is necessary to disassemble the carriers one by one, and then install the carriers back one by one after cleaning, which is time-consuming and laborious, and the efficiency is very low. At the same time, both of these plans have a common disadvantage that maintenance personnel need to enter the encapsulation to perform the disassembly and purging operations of the carriers. The temperature inside is high and the dust is large, which is not conducive to the health of the operators.

[0005] For those skilled in the art, how to quickly and conveniently achieve carrier purging and improve the maintenance operation efficiency is a technical problem that needs to be solved at present. Utility Model Content

[0006] The present utility model provides a catalyst carrier installation device, which can extract all the carriers at one time for cleaning, quickly and conveniently achieve carrier purging, and has a higher maintenance operation efficiency. The specific solution is as follows:

[0007] A catalyst carrier installation device includes a box body base component and a movable frame component, and the movable frame component can be integrally taken out from the box body base component;

[0008] The box body base component includes a perforated plate and a back frame, and a plurality of through holes are provided on the perforated plate;

[0009] The movable frame component includes a support frame, carriers and a pressing mechanism. Each carrier corresponds to one through hole, and a plurality of the carriers are installed on the support frame and can axially move relative to the support frame; the pressing mechanism is located at the rear end of the carrier and is used to press the carrier on the surface of the perforated plate.

[0010] Optionally, the pressing mechanism includes an outer adjusting plate, an inner adjusting plate, an elastic element and an adjusting pull rod;

[0011] A plurality of wedge-shaped mating surfaces are provided at the positions where the outer adjusting plate and the inner adjusting plate are in contact with each other. When the adjusting pull rod pulls the outer adjusting plate, the inner adjusting plate moves axially along the carrier;

[0012] The elastic element is installed on the inner adjusting plate, and at least one elastic element is correspondingly arranged for each carrier. The elastic element is used to elastically extrude the carrier along the axial direction.

[0013] Optionally, a limiting block is arranged at one end of the inner adjusting plate;

[0014] The elastic element is a spring piece.

[0015] Optionally, one row or one column of the carriers are compressed by two of the pressing mechanisms.

[0016] Optionally, the pressing mechanism is arranged horizontally for pressing one row of the carriers;

[0017] The movable frame assembly is arranged to support the frame columns and the limiting cross plates of the outer adjusting plate.

[0018] Optionally, a supporting block for supporting the pressing mechanism is arranged on the supporting frame.

[0019] Optionally, a positioning rod and a blocking rod are arranged on the back frame. The positioning rod is used to define the putting position of the movable frame assembly, and the blocking rod and the positioning rod are used to axially support the movable frame assembly.

[0020] Optionally, a frame wheel is arranged at the bottom of the movable frame assembly;

[0021] An inner track is arranged on the box body base of the box body base assembly.

[0022] Optionally, it further includes a picking and placing trolley. An outer track is arranged on the picking and placing trolley, and the outer track can be docked with the inner track.

[0023] The present utility model further provides an engine exhaust gas purification and treatment system, including an exhaust gas collection pipeline, a heater, a DOC treatment module, an SCR treatment module, and an exhaust gas fan. The exhaust gas fan is used to generate a suction force to enable the exhaust gas collection pipeline to collect exhaust gas and enable the exhaust gas to sequentially pass through the heater, the DOC treatment module, the SCR treatment module, and the exhaust gas fan;

[0024] The DOC treatment module and the SCR treatment module adopt the catalyst carrier installation device described in any one of the above.

[0025] The present utility model provides a catalyst carrier installation device, in which the movable frame assembly can be taken out integrally from the box body base assembly; the box body base assembly includes a perforated plate and a back frame, and a plurality of through holes are provided on the perforated plate; the movable frame assembly includes a support frame, carriers and a pressing mechanism, and a plurality of carriers are installed on the support frame, each carrier corresponds to a through hole on the perforated plate, and the carrier can axially move relative to the support frame; the pressing mechanism is located at the rear end of the carrier and is used to press the carrier on the surface of the perforated plate; when purging is required, the movable frame can be taken out from the box body base, and all the carriers can be drawn out at one time, and the carriers can be purged and cleaned outside the box body base without disassembling them one by one, and the carrier purging can be realized quickly and conveniently, improving the maintenance operation efficiency. Brief Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can obtain other drawings according to these drawings without creative efforts.

[0027] Figure 1 It is a front view schematic diagram of the movable frame assembly of the catalyst carrier installation device provided by the present utility model being moved out of the box body base assembly;

[0028] Figure 2 It is a side view schematic diagram of the movable frame assembly of the catalyst carrier installation device provided by the present utility model entering the box body base assembly;

[0029] Figure 3 It is a top view schematic diagram of a row of carriers cooperating with the pressing mechanism;

[0030] Figure 4 It is a schematic block diagram of an engine exhaust gas purification treatment system.

[0031] The figures include:

[0032] Box body base assembly 1, perforated plate 11, through hole 111, back frame 12, stop rod 121, blocking rod 122, box body base 13, inner track 131;

[0033] Movable frame assembly 2, support frame 21, carrier 22, pressing mechanism 23, outer adjusting plate 231, inner adjusting plate 232, elastic element 233, adjusting pull rod 234, limit block 235, frame column 24, limit cross plate 241, frame wheel 25;

[0034] Taking and placing trolley 3, outer track 31;

[0035] Tail gas collection pipeline 41, heater 42, DOC treatment module 43, SCR treatment module 44, and exhaust fan 45. Detailed implementation mode

[0036] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the catalyst carrier installation device of the present utility model will be introduced and described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0037] Combined with Figure 1 、 Figure 2 As shown, the present utility model provides a catalyst carrier installation device, which includes a box body base component 1 and a movable frame component 2. The movable frame component 2 is installed in the box body base component 1, and the movable frame component 2 can be taken out integrally from the box body base component 1.

[0038] The box body base component 1 is a base structure. The box body base component 1 includes a perforated plate 11 and a back frame 12. Combined with Figure 2 as shown by the arrow in the figure, the perforated plate 11 is located on the side facing the oncoming air flow. The side that first contacts the air flow is the front. A plurality of through holes 111 are provided on the perforated plate 11. The air flow flows into the carrier 22 from the through holes 111. The medium inside the carrier 22 filters the air flow and discharges it from the back frame 12. The back frame 12 is a non-closed structure and allows the air flow to be discharged.

[0039] The movable frame component 2 includes a support frame 21, a carrier 22, and a pressing mechanism 23. The support frame 21 is installed with the carrier 22 and the pressing mechanism 23, which plays a role in carrying the carrier 22. Each carrier 22 corresponds to a through hole 111. A plurality of carriers 22 are installed on the support frame 21 and can move axially relative to the support frame 21; the pressing mechanism 23 is located at the rear end of the carrier 22 and is used to press the carrier 22 against the surface of the perforated plate 11. By providing a forward pressing force on the carrier 22 through the pressing mechanism 23, the carrier 22 is made to closely adhere to the surface of the perforated plate 11. Each carrier 22 corresponds to a through hole 111, ensuring close contact between the carrier 22 and the perforated plate 11, and enabling the gas entering from the through holes 111 to flow through the carrier 22 to the greatest extent.

[0040] During normal operation for filtration, the movable frame component 2 is located inside the box base component 1. When it is necessary to clean the carrier 22, the movable frame component 2 is taken out from the box base component 1, that is, the support frame 21 is moved so that all the carriers 22 mounted thereon are taken out from the box base component 1, and each carrier 22 can be cleaned outside the box base component 1. Compared with the existing solution, this device does not need to disassemble the carriers 22 one by one. Therefore, during equipment maintenance, the disassembly and installation work efficiency can be greatly improved, the labor intensity of maintenance personnel can be reduced, the maintenance time can be shortened, and the impact on the test progress caused by equipment maintenance can be minimized. Further, after adopting the new solution, the maintenance personnel do not need to enter the package to disassemble and purge the carriers, avoiding the harm to the body caused by high temperature and dust.

[0041] On the basis of the above solution, in combination with Figure 3 As shown, where the arrow indicates the air flow direction, the pressing mechanism 23 of the present invention includes an outer adjusting plate 231, an inner adjusting plate 232, an elastic element 233, and an adjusting pull rod 234; the outer adjusting plate 231 and the inner adjusting plate 232 are in contact with each other, and the inner adjusting plate 232 is closer to the windward side; a plurality of wedge-shaped mating surfaces are respectively arranged at the positions where the outer adjusting plate 231 and the inner adjusting plate 232 are in contact with each other, that is, a plurality of wedge-shaped mating surfaces are respectively arranged on the front side of the outer adjusting plate 231 and the rear side of the inner adjusting plate 232. The wedge-shaped mating surfaces are arranged in a serrated distribution, and the wedge-shaped mating surfaces of the outer adjusting plate 231 are parallel to the wedge-shaped mating surfaces of the inner adjusting plate 232.

[0042] An adjusting pull rod 234 is arranged at one end of the outer adjusting plate 231. As Figure 3 shown, the adjusting pull rod 234 is located at the right end of the outer adjusting plate 231. When the adjusting pull rod 234 pulls the outer adjusting plate 231, the inner adjusting plate 232 moves along the axial direction of the carrier 22; in combination with Figure 3 , when the outer adjusting plate 231 is driven to move along the Y-axis by the adjusting pull rod 234, the carrier 22 can be displaced in the X-axis direction through the transmission of the wedge-shaped mating surfaces between the outer adjusting plate 231 and the inner adjusting plate 232. When it is necessary to tighten the carrier 22, the adjusting pull rod 234 pulls the outer adjusting plate 231 to the right, and the inner adjusting plate 232 remains stationary in the Y-axis direction. Then, the inner adjusting plate 232 will push the carrier 22 to move along the X-axis direction towards the windward side, so that the carrier 22 is tightened against the surface of the orifice plate 11.

[0043] The elastic element 233 is installed on the inner adjusting plate 232. At least one elastic element 233 is correspondingly arranged for each carrier 22. The elastic element 233 is used to elastically extrude the carrier 22 along the axial direction. Due to the inevitable tolerances in the manufacturing of the carrier 22 and the inner adjusting plate 232, it is difficult to ensure that the axial lengths of all carriers 22 are exactly the same. By arranging the elastic element 233 at the rear side of the carrier 22, the elastic element 233 applies an elastic thrust forward to the carrier 22, compensating for the problem that the carriers 22 cannot all contact the surface of the orifice plate 11 due to reasons such as dimensional differences of the carriers 22, so that the front side of each carrier 22 can effectively contact the orifice plate 11. Combined with Figure 3 As shown, the inner adjusting plate 232 can push a row of carriers 22 forward. For the carriers 22 with larger axial dimensions, the deformation degree of their elastic elements 233 under extrusion is slightly smaller, and for the carriers 22 with smaller axial dimensions, the deformation degree of their elastic elements 233 under extrusion is slightly larger, ensuring that the carriers 22 are in close contact with the orifice plate 11.

[0044] A limiting block 235 is arranged at one end of the inner adjusting plate 232. The limiting block 235 is a fixed structure and can be fixedly installed on the support frame 21. Combined with Figure 3 As shown, the limiting block 235 is installed at the right end of the inner adjusting plate 232. When the adjusting pull rod 234 pulls the outer adjusting plate 231 to the right, the inner adjusting plate 232 is abutted and limited by the limiting block 235 to ensure that the inner adjusting plate 232 does not move to the right. When the adjusting pull rod 234 drives the outer adjusting plate 231 to move to the left, the forward pressing on the carrier 22 can be released to achieve loosening. Before removing the entire movable frame assembly 2 from the box body base assembly 1, it is necessary to first loosen the carrier 22.

[0045] Combined with Figure 3 As shown, the elastic element 233 adopted in the present utility model can be a spring sheet. The spring sheet adopts a flared shape. The middle of the spring sheet is fixed to the inner adjusting plate 232, and both sides are fixed to the carrier 22, using the elastic force of the spring sheet to push the carrier 22 forward. In addition to the spring sheet structure, the elastic element 233 can also be a helical spring.

[0046] A row or a column of carriers 22 is pressed by two pressing mechanisms 23. The two pressing mechanisms 23 are arranged parallel to each other, and can press a row (transverse Y-axis) of carriers 22 at the same time, or can press a column (vertical Z-axis) of carriers 22 at the same time.

[0047] Combined with Figure 1 、 Figure 2 As shown, in this embodiment, the pressing mechanism 23 is arranged horizontally and is used to press a row of carriers 22. A row of carriers 22 is provided with a forward thrust by two pressing mechanisms 23 extending along the Y-axis, and a row of carriers 22 is simultaneously pushed and tightened.

[0048] Combined with Figure 3As shown, on the back of the movable frame assembly 2, there are frame columns 24 and limit cross plates 241 for supporting the outer adjustment plate 231. A number of frame columns 24 extend vertically and are parallel to each other. The limit cross plates 241 extend horizontally. Through the cross - distribution of a number of limit cross plates 241 and a number of frame columns 24, a top - supporting structure is provided for the pressing mechanism 23 from the rear.

[0049] On the support frame 21, there are support blocks for supporting the pressing mechanism 23. Below each pressing mechanism 23, there is a support block structure to ensure the simultaneous support of the outer adjustment plate 231 and the inner adjustment plate 232.

[0050] On the back frame 12, there are a stop rod 121 and a blocking rod 122. The stop rod 121 is used to define the insertion position of the movable frame assembly 2, and the blocking rod 122 and the stop rod 121 are used to axially support the movable frame assembly 2 from the back. Figure 3 As shown, the cross - sectional structures of the stop rod 121 and the blocking rod 122 are shown. The cross - section of the stop rod 121 is L - shaped bent, and the blocking rod 122 is a flat plate. When the movable frame assembly 2 is pushed in from right to left, when it touches the stop rod 121, it means it has been pushed to the end. When the adjustment pull rod 234 pulls the outer adjustment plate 231 to move and then pushes the carrier 22 forward, the blocking rod 122 and the stop rod 121 axially support the movable frame assembly 2 from the back along the X - axis direction.

[0051] As shown in combination with Figure 1 、 Figure 2 On the bottom of the movable frame assembly 2, there are two rows of frame wheels 25. On the box base 13 of the box body base assembly 1, there is an inner track 131. The two rows of frame wheels 25 can move along the two inner tracks 131, and the movable frame assembly 2 can horizontally enter and exit the box body base assembly 1 perpendicular to the entry direction.

[0052] As shown in combination with Figure 1 , there is a loading and unloading cart 3. The loading and unloading cart 3 can be manually pushed or automatically displaced. An outer track 31 is provided on the loading and unloading cart 3. The outer track 31 can be docked with the inner track 131. A positioning block is provided at the docking position of the outer track 31 and the inner track 131 to ensure accurate alignment of the two. When it is necessary to take out the movable frame assembly 2, first align the outer track 31 with the inner track 131, and pull the movable frame assembly 2 outwards so that it reaches the outer track 31. The outer track 31 supports the movable frame assembly 2, and at this time, it can be cleaned in place or moved to other positions for cleaning.

[0053] The loading and unloading cart 3 can be provided with a height - adjusting mechanism to adaptively adjust the height of the outer track 31, which can be adapted to inner tracks 131 of different heights.

[0054] In the catalytic carrier of the engine exhaust gas purification treatment system, there are DOC and SCR, which are respectively installed in two packages. Since the inside of the smoke pipe is in a negative pressure state during operation, the particulate matter in the exhaust gas and a small amount of external dust are blown into the honeycomb carrier together, thereby polluting the carrier, increasing the pressure difference before and after the carrier, increasing the fan load and energy consumption, and reducing the treatment effect. Therefore, it is necessary to disassemble and blow the carrier for maintenance irregularly according to the equipment status. The carrier maintenance must be carried out when the temperature in the system reactor drops below 60 °C, and it can only be carried out by professional technicians after shutting down and cutting off the power supply. The maintenance cycle is short, the time-consuming is long, the workload is large, and it has a great impact on the test progress.

[0055] In view of the above problems, the present utility model also provides an engine exhaust gas purification treatment system, in combination with Figure 4 As shown in the figure, the system includes an exhaust gas collection pipe 41, a heater 42, a DOC treatment module 43, an SCR treatment module 44, and an exhaust fan 45. The exhaust fan 45 is used to generate a suction force to collect the exhaust gas through the exhaust gas collection pipe 41, and make the exhaust gas pass through the heater 42, the DOC treatment module 43, the SCR treatment module 44, and the exhaust fan 45 in sequence; the DOC treatment module 43 and the SCR treatment module 44 adopt the above-mentioned catalyst carrier installation device, and can achieve the purpose of fast, simple and clean.

[0056] When it is necessary to clean and maintain the carrier, first cool down and then open the inspection door of the box body base assembly 1, adjust the pull rod 234 to loosen each layer of the pressing mechanism 23, so that the carrier 22 and the support frame 21 are no longer stressed. At this time, the entire movable frame assembly 2 can be moved out of the box body base assembly 1 along the inner track 131 and placed on the outer track 31 of the pick-up and drop-off trolley 3. The removed movable frame assembly 2 can be pulled to a suitable place for overall blowing and cleaning, instead of disassembling the carriers one by one as before, and the efficiency is obviously much higher. When it needs to be restored after cleaning, as described above, first push the movable frame assembly 2 into the box body in place, and then tighten all the adjusting pull rods 234 until the carrier 22 is clamped. Obviously, after adopting this clamping scheme, the maintenance efficiency is much higher, and the blowing effect of the carrier can also be guaranteed.

[0057] The adopted wedge-shaped pressing mechanism can not only make the carrier fit well with the plate holes, but also realize the overall removal of the carrier from the package, without the need to disassemble them one by one. Therefore, during the equipment overhaul and maintenance, it can greatly improve the disassembly and installation work efficiency, reduce the labor intensity of the maintenance personnel, shorten the overhaul time, and minimize the impact on the test progress caused by the equipment overhaul and maintenance. Further, after adopting the new scheme, the maintenance personnel do not need to enter the package to disassemble and blow the carrier, avoiding the harm of high temperature and dust to the body.

[0058] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A catalyst carrier mounting device, characterized in that, It includes a box body base assembly (1) and a movable frame assembly (2), and the movable frame assembly (2) can be taken out integrally from the box body base assembly (1); The box body base assembly (1) includes a perforated plate (11) and a back frame (12), and a plurality of through holes (111) are provided on the perforated plate (11); The movable frame assembly (2) includes a support frame (21), a carrier (22) and a pressing mechanism (23). Each carrier (22) corresponds to one through hole (111), and a plurality of carriers (22) are installed on the support frame (21) and can move axially relative to the support frame (21); the pressing mechanism (23) is located at the rear end of the carrier (22) and is used to press the carrier (22) against the surface of the perforated plate (11).

2. The catalyst carrier mounting device according to claim 1, characterized in that, The pressing mechanism (23) includes an outer adjusting plate (231), an inner adjusting plate (232), an elastic element (233), and an adjusting pull rod (234); A plurality of wedge-shaped mating surfaces are provided at the position where the outer adjusting plate (231) contacts the inner adjusting plate (232). When the adjusting pull rod (234) pulls the outer adjusting plate (231), the inner adjusting plate (232) moves axially along the carrier (22); The elastic element (233) is installed on the inner adjusting plate (232), and at least one elastic element (233) is provided corresponding to each carrier (22). The elastic element (233) is used to elastically press the carrier (22) axially.

3. The catalyst carrier mounting device according to claim 2, wherein A limit block (235) is provided at one end of the inner adjusting plate (232); The elastic element (233) is a spring piece.

4. The catalyst carrier mounting device according to claim 2, characterized in that, One row or one column of the carriers (22) is pressed by two pressing mechanisms (23).

5. The catalyst carrier mounting device according to claim 2, characterized in that, The pressing mechanism (23) is arranged horizontally and is used to press one row of the carriers (22); The movable frame assembly (2) is provided with a frame column (24) and a limit cross plate (241) for supporting the outer adjusting plate (231).

6. The catalyst carrier mounting device according to claim 5, characterized in that, A support block for supporting the pressing mechanism (23) is provided on the support frame (21).

7. The catalyst carrier mounting device according to claim 5, wherein The back frame (12) is provided with a stop rod (121) and a blocking rod (122). The stop rod (121) is used to define the placing position of the movable frame assembly (2), and the blocking rod (122) and the stop rod (121) are used to axially support the movable frame assembly (2).

8. The catalyst carrier mounting device according to claim 1, wherein A frame wheel (25) is provided at the bottom of the movable frame assembly (2); An inner track (131) is provided on the box body base (13) of the box body base assembly (1).

9. The catalyst carrier mounting device according to claim 8, wherein, It further includes a pick-and-place trolley (3). An outer track (31) is provided on the pick-and-place trolley (3), and the outer track (31) can be docked with the inner track (131).

10. An engine exhaust gas purification and treatment system, comprising an exhaust gas collection pipeline (41), a heater (42), a DOC treatment module (43), an SCR treatment module (44), and an exhaust gas fan (45), characterized in that, The exhaust gas fan (45) is used to generate a suction force, so that the exhaust gas collection pipe (41) collects exhaust gas, and the exhaust gas sequentially passes through the heater (42), the DOC treatment module (43), the SCR treatment module (44), and the exhaust gas fan (45); The DOC processing module (43) and the SCR processing module (44) adopt the catalyst carrier mounting device described in any one of claims 1 to 9.

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