Post-treatment device and tail gas treatment system

Abstract

The invention belongs to the technical field of tail gas treatment, and discloses a post-treatment device and a tail gas treatment system.The post-treatment device comprises a shell and a tail gas treatment unit, and the shell is provided with a containing cavity and a dismounting opening communicating with the containing cavity and is connected with an inlet unit and an outlet unit; the tail gas treatment unit is used for integrating one or more of a DOC module, a DPF module, an SCR module, an ASC module, a TWC module and an HOC module; the tail gas treatment unit can enter and exit from the containing cavity through the disassembly opening, so that disassembly and assembly of the tail gas treatment unit are completed, different types of tail gas treatment units are replaced, and when the tail gas treatment unit is installed in the containing cavity, gas can sequentially pass through the inlet unit, the tail gas treatment unit and the outlet unit. According to the post-treatment device, different types of tail gas treatment units can be installed according to different use scenes so as to meet the tail gas treatment requirements of different scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust gas treatment, and particularly to a post-treatment device and an exhaust gas treatment system. Background Art

[0002] Vehicle post-treatment devices usually include one or a combination of DOC (Diesel Oxidation Catalyst), DPF (Diesel Particulate Filter), SCR (Selective Catalytic Reduction), ASC (Ammonia Slip Catalyst), TWC (Three-Way Catalytic Converter), and HOC (Hydrogen Oxidation Catalyst) modules. The components of post-treatment devices for engines with different regulations and different fuels are all different. For example, the post-treatment device of a National VI diesel vehicle usually adopts the combination of DOC+DPF+SCR / ASC modules, the post-treatment device of a National VI gas vehicle usually adopts the TWC module, and the hydrogen fuel engine will be provided with the HOC module. At present, the exhaust gas components that the post-treatment device can handle are relatively single and cannot adapt to different usage scenarios. Summary of the Invention

[0003] According to one aspect of the present invention, the present invention provides a post-treatment device to solve the problem that the exhaust gas components that the existing post-treatment device can handle are relatively single and cannot adapt to different usage scenarios.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The post-treatment device includes:

[0006] A housing having a receiving cavity and a disassembly opening communicating with the receiving cavity, and connected with an inlet unit and an outlet unit;

[0007] An exhaust gas treatment unit for integrating one or more of the DOC module, DPF module, SCR module, ASC module, TWC module, and HOC module; the exhaust gas treatment unit can enter and exit the receiving cavity through the disassembly opening. When the exhaust gas treatment unit is installed in the receiving cavity, the gas can sequentially pass through the inlet unit, the exhaust gas treatment unit, and the outlet unit.

[0008] As a preferred solution of the post-treatment device, an installation sleeve is provided inside the housing. The exhaust gas treatment unit has an outer wall, which is cylindrical and can be installed inside the installation sleeve. The cross-section of the disassembly opening is circular, and the disassembly opening is coaxial with the installation sleeve.

[0009] As a preferred solution of the post-treatment device, a first partition and a second partition are provided inside the housing. The first partition and the second partition are arranged at intervals and divide the accommodation cavity into a first chamber, a second chamber and a third chamber. The first chamber is located between the second chamber and the third chamber. Gas can enter the first chamber through the inlet unit. The first chamber is communicated with the second chamber through a through hole formed on the first partition. Two ends of the installation sleeve are respectively fixedly arranged on the first partition and the second partition. The second chamber is communicated with the third chamber through the exhaust gas treatment unit. The gas in the third chamber can be discharged through the outlet unit.

[0010] As a preferred solution of the post-treatment device, both the installation sleeve and the outer wall are made of heat-conducting materials.

[0011] As a preferred solution of the post-treatment device, a plurality of catalyst carriers are arranged inside the outer wall, and gas can sequentially pass through the plurality of catalyst carriers.

[0012] As a preferred solution of the post-treatment device, a locking member is further included. When the outer wall is installed inside the installation sleeve, the locking member can lock or unlock the outer wall and the installation sleeve.

[0013] As a preferred solution of the post-treatment device, a cover plate is further included, and the cover plate is used to open or close the disassembly opening.

[0014] As a preferred solution of the post-treatment device, the exhaust gas treatment unit is integrated with an SCR module. The inlet unit is provided with a urea injector for injecting urea. The inlet unit is further connected with a mixer, and the mixer is located downstream of the urea injector and is used to mix gas and urea.

[0015] As a preferred solution of the post-treatment device, the inlet unit is provided with one or more of a front NOx sensor, a front oxygen sensor, a front pressure sensor and a front temperature sensor; and / or,

[0016] The outlet unit is provided with one or more of a rear NOx sensor, a rear oxygen sensor, a rear pressure sensor and a rear temperature sensor.

[0017] According to another aspect of the present invention, there is provided an exhaust gas treatment system, including two of the above-mentioned aftertreatment devices, wherein the outlet unit of the first one of the two aftertreatment devices is connected to the inlet unit of the second one.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides an aftertreatment device, including a housing and an exhaust gas treatment unit. The housing has a receiving cavity and a disassembly opening communicating with the receiving cavity, and is connected with an inlet unit and an outlet unit; the exhaust gas treatment unit is used to integrate one or more of a DOC module, a DPF module, an SCR module, an ASC module, a TWC module and an HOC module; the exhaust gas treatment unit can enter and exit the receiving cavity through the disassembly opening, so as to complete the disassembly and assembly of the exhaust gas treatment unit, and replace different types of exhaust gas treatment units. When the exhaust gas treatment unit is installed in the receiving cavity, the gas can sequentially pass through the inlet unit, the exhaust gas treatment unit and the outlet unit. This aftertreatment device can install different types of exhaust gas treatment units for different usage scenarios to meet the exhaust gas treatment requirements of different scenarios.

[0020] The present invention also provides an exhaust gas treatment system, including two aftertreatment devices, wherein the outlet unit of the first one of the two aftertreatment devices is connected to the inlet unit of the second one, so that the two aftertreatment devices are arranged in series to improve the exhaust gas treatment effect. This exhaust gas treatment system can be used for vehicles and can also be used in scenarios such as engine production plants. The above-mentioned aftertreatment device can install different types of exhaust gas treatment units for different usage scenarios to meet the exhaust gas treatment requirements of different scenarios. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the aftertreatment device in an embodiment of the present invention;

[0022] Figure 2 is a first cross-sectional view of the aftertreatment device in an embodiment of the present invention;

[0023] Figure 3 is a second cross-sectional view of the aftertreatment device in an embodiment of the present invention;

[0024] Figure 4 is a first combined structural schematic diagram of two aftertreatment devices in an embodiment of the present invention;

[0025] Figure 5 is a second combined structural schematic diagram of two aftertreatment devices in an embodiment of the present invention;

[0026] Figure 6 is a third combined structural schematic diagram of two aftertreatment devices in an embodiment of the present invention.

[0027] In the figure:

[0028] 1. Housing; 101. Accommodation cavity; 1011. First chamber; 1012. Second chamber; 1013. Third chamber; 102. Demounting opening; 11. First partition; 111. Through hole; 12. Second partition; 13. Fixed connecting rod;

[0029] 2. Mounting sleeve; 21. Sleeve sealing ring;

[0030] 3. Inlet unit; 31. Front NOx sensor; 32. Front oxygen sensor; 33. Front pressure sensor; 34. Front temperature sensor; 35. Inlet flange;

[0031] 4. Exhaust gas treatment unit; 41. Outer wall; 42. Catalyst carrier; 43. Gasket; 44. First handle;

[0032] 5. Outlet unit; 51. Rear NOx sensor; 52. Rear oxygen sensor; 53. Rear pressure sensor; 54. Rear temperature sensor; 55. Outlet flange;

[0033] 6. Cover plate; 61. Cover plate sealing ring; 62. Second handle;

[0034] 71. Urea injector; 72. Mixer; 721. Mixer through hole;

[0035] 8. Connecting pipeline. Detailed implementation manners

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention rather than all structures are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] In the present invention, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left" and "right" are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operations. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0040] A vehicle aftertreatment device generally includes a combination of one or more of a DOC module, a DPF module, an SCR module, an ASC module, a TWC module and an HOC module. The components of the engine aftertreatment device for different regulations and different fuels are all different. For example, the aftertreatment device of a National VI diesel vehicle usually adopts the combination of DOC+DPF+SCR / ASC modules, the aftertreatment device of a National VI gas vehicle usually adopts a TWC module, and an HOC module will be provided for a hydrogen fuel engine. At present, the exhaust gas components that the aftertreatment device can handle are relatively single and cannot adapt to different usage scenarios.

[0041] In view of this, this embodiment provides an aftertreatment device to solve the problem that the exhaust gas components that the existing aftertreatment device in the prior art can handle are relatively single and cannot adapt to different usage scenarios, and it can be used in the technical field of exhaust gas treatment.

[0042] Refer to Figures 1-3, the post-treatment device includes a housing 1 and an exhaust gas treatment unit 4. The housing 1 has a receiving cavity 101 and a disassembly opening 102 communicating with the receiving cavity 101, and is connected with an inlet unit 3 and an outlet unit 5; the exhaust gas treatment unit 4 is used to integrate one or more of a DOC module, a DPF module, an SCR module, an ASC module, a TWC module and an HOC module; the exhaust gas treatment unit 4 can enter and exit the receiving cavity 101 through the disassembly opening 102, so as to complete the disassembly and assembly of the exhaust gas treatment unit 4 to replace different types of exhaust gas treatment units 4. When the exhaust gas treatment unit 4 is installed in the receiving cavity 101, the gas can sequentially pass through the inlet unit 3, the exhaust gas treatment unit 4 and the outlet unit 5. This post-treatment device can install different types of exhaust gas treatment units 4 according to different usage scenarios to meet the exhaust gas treatment requirements of different scenarios.

[0043] Specifically, this post-treatment device can be used in an engine production factory. According to information such as the model, displacement, and fuel of the production hot-test engine, different post-treatment modules are combined to form different types of exhaust gas treatment units 4 to meet the experimental requirements of various special application scenarios or specific emission regulations and complete the hot-test verification, with relatively high flexibility. For example, when producing a national VI diesel engine, the exhaust gas treatment unit 4 is a module combination of DOC + DPF + SCR / ASC; when producing a national VI gas engine, the exhaust gas treatment unit 4 is a module combination of TWC; when producing a hydrogen fuel engine, the exhaust gas treatment unit 4 is a module combination of HOC + SCR. In addition, according to actual usage requirements, an exhaust gas treatment unit 4 without installing any modules or without installing the exhaust gas treatment unit 4 can also be selected.

[0044] Continue to refer to Figures 1-3 , an installation sleeve 2 is arranged inside the housing 1. The exhaust gas treatment unit 4 has an outer wall 41. The outer wall 41 is cylindrical and can be installed inside the installation sleeve 2. The cross-section of the disassembly opening 102 is circular, and the disassembly opening 102 is coaxial with the installation sleeve 2. The user only needs to pull or push the exhaust gas treatment unit 4 along the axis of the installation sleeve 2 to complete the disassembly and assembly of the exhaust gas treatment unit 4.

[0045] Continue to refer to Figures 1-3, a first partition 11 and a second partition 12 are provided inside the housing 1. The first partition 11 and the second partition 12 are arranged at intervals and divide the accommodation cavity 101 into a first chamber 1011, a second chamber 1012 and a third chamber 1013. The first chamber 1011 is located between the second chamber 1012 and the third chamber 1013. Gas can enter the first chamber 1011 through the inlet unit 3. The first chamber 1011 and the second chamber 1012 are connected through a through hole 111 opened on the first partition 11. Both ends of the mounting sleeve 2 are fixedly arranged on the first partition 11 and the second partition 12 respectively. The second chamber 1012 and the third chamber 1013 are connected through the tail gas treatment unit 4. The gas in the third chamber 1013 can be discharged through the outlet unit 5. Thus, the accommodation cavity 101 is divided by the first partition 11 and the second partition 12. The gas first enters the first chamber 1011 through the inlet unit 3, then enters the second chamber 1012 through the through hole 111, and then the gas passes through the tail gas treatment unit 4, and the tail gas treatment unit 4 treats the gas. Subsequently, the gas flows into the third chamber 1013 and is finally discharged through the outlet unit 5.

[0046] Optionally, a sleeve sealing ring 21 is provided between the outer wall 41 and the mounting sleeve 2 to make their connection sealed, so as to prevent the gas in the second chamber 1012 from leaking from between the outer wall 41 and the mounting sleeve 2 to the third chamber 1013.

[0047] Continue to refer to Figures 1-3 , both the mounting sleeve 2 and the outer wall 41 are made of heat-conducting materials, so that the mounting sleeve 2 and the outer wall 41 can exchange heat with the external gas. When the gas enters the first chamber 1011, its temperature is relatively high, and the inside of the tail gas treatment unit 4 can be preheated in advance through the mounting sleeve 2 and the outer wall 41 to improve the post-treatment effect.

[0048] Continue to refer to Figures 1-3 , a number of catalyst carriers 42 are provided inside the outer wall 41. The gas can pass through the number of catalyst carriers 42 in sequence. Among them, the catalyst carriers 42 are used to place catalysts to form a DOC module, a DPF module, an SCR module, an ASC module, a TWC module or an HOC module. For engines of different types and different displacements, different numbers of catalyst carriers 42 can be set, and different types of catalysts are set on different catalyst carriers 42. For example, when producing a large-displacement diesel engine that meets the national VI standard, both the DOC module and the DPF module are set to 1, and the SCR module is set to 2; for another example, when producing a small-displacement gas engine, the TWC module can be set to 1, and it can be set to 2 or more for a small-displacement gas engine; for another example, when producing a national VII engine, the number of SCR modules, the number of DPF modules and the number of DOC modules can also be set to other numbers, and the specific set number can also be determined according to the actual emission conditions and the back pressure of the tail gas treatment device.

[0049] Optionally, a gasket 43 is provided between the catalyst carrier 42 and the outer wall 41 to provide a certain degree of protection for the catalyst carrier 42.

[0050] Optionally, a first handle 44 is fixedly provided at one end of the outer wall 41 close to the disassembly opening 102 to facilitate the user to pull the outer wall 41 to complete the disassembly.

[0051] Continue to refer to Figures 1-3 , the post-treatment device further includes a locking member. When the outer wall 41 is installed in the installation sleeve 2, the locking member can lock or unlock the outer wall 41 and the installation sleeve 2. Specifically, a blocking structure is provided at one end of the installation sleeve 2 away from the disassembly opening 102, and the blocking structure can abut against the outer wall 41, so that the outer wall 41 only needs to be abutted against the blocking structure to complete the locking. In this embodiment, the locking member is a fixed connecting rod 13 whose one end is movably connected to the inner wall of the housing 1. The length of the fixed connecting rod 13 is adjustable. When it is necessary to lock the outer wall 41 and the installation sleeve 2, the fixed connecting rod 13 can be extended so that the fixed connecting rod 13 abuts against the outer wall 41, and the outer wall 41 is abutted against the blocking structure to complete the locking. When unlocking is required, only the length of the fixed connecting rod 13 needs to be shortened to separate the fixed connecting rod 13 from the outer wall 41. Among them, the fixed connecting rod 13 is composed of two connecting rods. Both connecting rods are provided with external threads, and the directions of the threads are opposite. Both connecting rods are threadedly connected to a nut, and the fixed connecting rod 13 can be extended or shortened by rotating the nut.

[0052] In other embodiments, the locking member can also be a bolt. The bolt can pass through the outer wall 41 and be threadedly connected to the installation sleeve 2, and it can also achieve locking and unlocking.

[0053] Continue to refer to Figures 1-3 , the post-treatment device further includes a cover plate 6. The cover plate 6 is used to open or close the disassembly opening 102, so as to close the disassembly opening 102 when the post-treatment device is working. Optionally, a cover plate sealing ring 61 is further provided between the cover plate 6 and the side wall of the disassembly opening 102 to improve the sealing effect and prevent gas leakage. Optionally, the cover plate 6 is also fixedly connected with a second handle 62 to facilitate the user to operate.

[0054] Optionally, there are multiple exhaust gas treatment units 4, and the multiple exhaust gas treatment units 4 are arranged in parallel. In addition, the number of the disassembly openings 102 and the cover plates 6 is also multiple, and the multiple exhaust gas treatment units 4, the multiple disassembly openings 102 and the multiple cover plates 6 are arranged in one-to-one correspondence. In this embodiment, the number of the exhaust gas treatment units 4 is specifically two.

[0055] Continue to refer to Figures 1-3, the tail gas treatment unit 4 is integrated with an SCR module. The inlet unit 3 is provided with a urea injector 71 for injecting urea. The inlet unit 3 is also connected to a mixer 72. The mixer 72 is located downstream of the urea injector 71 and is used to mix the gas with urea so that the mixed gas of the tail gas and urea enters the SCR module for selective catalytic reduction. Optionally, the mixer 72 is cylindrical and is provided with a plurality of mixer through holes 721 to further improve the crushing effect of the urea droplets and enable the tail gas and urea to be fully mixed and discharged from the mixer 72.

[0056] Continue to refer to Figures 1-3 , the inlet unit 3 is provided with one or more of a front NOx sensor 31, a front oxygen sensor 32, a front pressure sensor 33, and a front temperature sensor 34; and / or, the outlet unit 5 is provided with one or more of a rear NOx sensor 51, a rear oxygen sensor 52, a rear pressure sensor 53, and a rear temperature sensor 54. Among them, the front NOx sensor 31 is used to detect the NOx concentration in the gas of the inlet unit 3, the front oxygen sensor 32 is used to detect the oxygen concentration in the gas of the inlet unit 3, the front pressure sensor 33 is used to detect the pressure of the gas of the inlet unit 3, and the front temperature sensor 34 is used to detect the temperature of the gas of the inlet unit 3; the rear NOx sensor 51 is used to detect the NOx concentration in the gas of the outlet unit 5, the rear oxygen sensor 52 is used to detect the oxygen concentration in the gas of the outlet unit 5, the rear pressure sensor 53 is used to detect the pressure of the gas of the outlet unit 5, and the rear temperature sensor 54 is used to detect the temperature of the gas of the outlet unit 5. The detection results of the above sensors can be sent to the controller, and the controller judges the operating state of the engine at this time and the tail gas treatment effect of the aftertreatment device, so as to adjust the operating parameters of the engine or adjust parameters such as the urea injection amount of the aftertreatment device. In this embodiment, an example is given of a scheme in which the inlet unit 3 is simultaneously provided with a front NOx sensor 31, a front oxygen sensor 32, a front pressure sensor 33, and a front temperature sensor 34, and the outlet unit 5 is simultaneously provided with a rear NOx sensor 51, a rear oxygen sensor 52, a rear pressure sensor 53, and a rear temperature sensor 54.

[0057] Optionally, the inlet unit 3 is specifically an inlet pipeline, and an inlet flange 35 is provided at the outer end of the inlet pipeline to facilitate the connection of the inlet unit 3 to an external structure. Similarly, the outlet unit 5 is specifically an outlet pipeline, and an outlet flange 55 is provided at the outer end of the outlet pipeline to facilitate the connection of the outlet unit 5 to an external structure.

[0058] This embodiment also provides an exhaust gas treatment system, which includes two after-treatment devices. The outlet unit 5 of the first of the two after-treatment devices is connected to the inlet unit 3 of the second one, so that the two after-treatment devices are arranged in series to improve the exhaust gas treatment effect. This exhaust gas treatment system can be used in vehicles and can also be used in scenarios such as engine production plants. The above-mentioned after-treatment devices can be installed with different types of exhaust gas treatment units 4 according to different usage scenarios to meet the exhaust gas treatment requirements of different scenarios.

[0059] Referring to Figure 4 , the first combination structure of the two after-treatment devices is that the two after-treatment devices are directly connected end to end, that is, the outlet flange 55 of one after-treatment device is directly connected to the inlet flange 35 of the other after-treatment device. This layout form does not require additional pipelines, and the structure is simple, but it will occupy a large space.

[0060] Referring to Figure 5 , the second combination structure of the two after-treatment devices is that the outlet flange 55 of one after-treatment device is connected to the connecting pipeline 8, the other end of the connecting pipeline 8 is connected to the inlet flange 35 of the other after-treatment device, and the disassembly ports 102 of the two after-treatment devices are arranged on the same side, so as to facilitate the user to disassemble and assemble the exhaust gas treatment units 4 of the two after-treatment devices, and this layout form has a compact structure and small space occupation.

[0061] Referring to Figure 6 , the third combination structure of the two after-treatment devices is that the outlet flange 55 of one after-treatment device is connected to the connecting pipeline 8, the other end of the connecting pipeline 8 is connected to the inlet flange 35 of the other after-treatment device, and the disassembly ports 102 of the two after-treatment devices are arranged on opposite sides to further reduce space occupation.

[0062] Of course, for different usage scenarios, different layout forms can be selected, and different types of exhaust gas treatment units 4 can also be installed accordingly.

[0063] For example, the hot test verification on the production line is for a National VI diesel engine. The exhaust gas treatment system in this embodiment can be set to the National VI diesel engine mode. The exhaust gas treatment unit 4 in one aftertreatment device needs to be set to a DOC + DPF module, and the exhaust gas treatment unit 4 in the other aftertreatment device needs to be set to an SCR / ASC module. When the exhaust gas emitted by the diesel engine sequentially passes through the inlet unit 3, DOC + DPF module, outlet unit 5 of one aftertreatment device, and the inlet unit 3, SCR / ASC module, outlet unit 5 of the other aftertreatment device, after the exhaust gas enters the DOC module from the inlet unit 3 for catalytic conversion, it enters the DPF module to trap particles, and then enters the mixer 72 of the other aftertreatment device, where it is mixed with the injected urea in the mixer 72, so that the exhaust gas enters the SCR module under the action of urea, and after catalytic conversion, the excessive ammonia is oxidized by the ASC module and discharged from the outlet unit 5. Optionally, an exhaust gas flow meter can also be installed in the connecting pipeline 8 between the two aftertreatment devices to make the measurement of the exhaust gas flow more accurate after the exhaust gas is stabilized by the aftertreatment device.

[0064] Again, for example, the hot test verification on the production line is for a National VI gas engine. The aftertreatment device in this embodiment can be set to the National VI gas engine mode. The exhaust gas treatment unit 4 in one aftertreatment device needs to be set to a TWC module, and the other aftertreatment device is set to an empty cylinder mode, that is, no aftertreatment module is set in the exhaust gas treatment unit 4, or the exhaust gas treatment unit 4 is not installed, or another aftertreatment device is no longer set. After the exhaust gas enters the TWC module from the inlet unit 3 of one aftertreatment device for catalytic conversion, it can be directly discharged from the outlet unit 5, and can be fed back to the engine through the front oxygen sensor 32 and the rear oxygen sensor 52 of the aftertreatment device to precisely control the stoichiometric ratio combustion of the engine.

[0065] Also, for example, the hot test verification on the production line is for a National V diesel engine. The aftertreatment device in this embodiment is set to the National V diesel engine mode. The exhaust gas treatment unit 4 in one aftertreatment device needs to be set to an SCR module, and the other aftertreatment device is set to an empty cylinder mode, that is, no aftertreatment module is set in the exhaust gas treatment unit 4, or the exhaust gas treatment unit 4 is not installed, or another aftertreatment device is no longer set. The exhaust gas enters the mixer 72 from the inlet unit 3 of one aftertreatment device, where it is mixed with the injected urea in the mixer 72, so that after the exhaust gas is catalytically converted in the SCR module under the action of urea, it is discharged from the outlet unit 5.

[0066] For the hot test verification of other fuel engines or other aftertreatment technical routes, the treatment methods of the used exhaust gas treatment systems are similar and will not be elaborated one by one. The combination forms, combination sequences, and catalyst carriers 42 used among the various modules in the exhaust gas treatment unit 4, as well as various layout methods of the aftertreatment device, can be determined according to the specific special application scenarios or the requirements of specific emission regulations.

[0067] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A post-processing device, characterized in that: include: A housing (1) having a containing chamber (101) and a disassembly port (102) communicating with the containing chamber (101), and connected to an inlet unit (3) and an outlet unit (5); An exhaust gas treatment unit (4) is used to integrate one or more of a DOC module, a DPF module, an SCR module, an ASC module, a TWC module and a HOC module; the exhaust gas treatment unit (4) can enter and exit the accommodating chamber (101) through the disassembly port (102); when the exhaust gas treatment unit (4) is installed in the accommodating chamber (101), gas can pass through the inlet unit (3), the exhaust gas treatment unit (4) and the outlet unit (5) in sequence.

2. The post-processing device according to claim 1, characterized in that: The shell (1) is provided with a mounting sleeve (2) inside, the exhaust gas treatment unit (4) has an outer wall (41), the outer wall (41) is cylindrical and can be mounted in the mounting sleeve (2), the disassembly opening (102) has a circular cross-section, and the disassembly opening (102) is coaxial with the mounting sleeve (2).

3. The post-processing device according to claim 2, characterized in that: A first partition (11) and a second partition (12) are arranged inside the shell (1); the first partition (11) and the second partition (12) are arranged at intervals and divide the accommodating chamber (101) into a first chamber (1011), a second chamber (1012) and a third chamber (1013); the first chamber (1011) is located between the second chamber (1012) and the third chamber (1013); gas can enter the first chamber through the inlet unit (3). (1011), the first chamber (1011) and the second chamber (1012) are connected via a through hole (111) provided on the first partition plate (11), the two ends of the mounting sleeve (2) are respectively fixedly disposed on the first partition plate (11) and the second partition plate (12), the second chamber (1012) and the third chamber (1013) are connected via the exhaust gas treatment unit (4), and the gas in the third chamber (1013) can be discharged via the outlet unit (5).

4. The post-processing device according to claim 3, characterized in that: The installation sleeve (2) and the outer wall (41) are both made of heat-conducting material.

5. The post-processing device according to claim 2, characterized in that: A plurality of catalyst carriers (42) are arranged inside the outer wall (41), and the gas can pass through the plurality of catalyst carriers (42) in sequence.

6. The post-processing device according to claim 2, characterized in that: It also comprises a locking member, which can lock or unlock the outer wall (41) and the mounting sleeve (2) when the outer wall (41) is mounted in the mounting sleeve (2).

7. The post-processing device according to any one of claims 1 to 6, characterized in that: It also includes a cover plate (6), and the cover plate (6) is used to open or close the disassembly opening (102).

8. The post-processing device according to any one of claims 1 to 6, characterized in that: The exhaust gas treatment unit (4) is integrated with an SCR module, the inlet unit (3) is provided with a urea injector (71) for injecting urea, and the inlet unit (3) is also connected to a mixer (72), the mixer (72) is located downstream of the urea injector (71) and is used to mix the gas with urea.

9. The post-processing device according to any one of claims 1 to 6, characterized in that: The inlet unit (3) is provided with one or more of a front NOx sensor (31), a front oxygen sensor (32), a front pressure sensor (33) and a front temperature sensor (34); and / or, The outlet unit (5) is provided with one or more of a rear NOx sensor (51), a rear oxygen sensor (52), a rear pressure sensor (53) and a rear temperature sensor (54).

10. The tail gas treatment system is characterized by: The invention comprises two post-processing devices according to any one of claims 1 to 9, wherein the outlet unit (5) of a first one of the two post-processing devices is connected to the inlet unit (3) of a second one of the two post-processing devices.

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