SCR (Selective Catalytic Reduction) equipment, post-treatment system and vehicle
By designing the baffle structure of the partition chamber in the SCR equipment, the problem of uneven flow of coolant is solved, uniform flow and heat exchange of cooling medium are achieved, the efficiency of the catalyst and the life of the equipment are improved, and pollutant emissions are reduced. .
Patent Information
- Application Number
- CN202421185424.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-05-28
AI Technical Summary
The flow of coolant in the existing SCR cooling system is uneven in the cavity, resulting in uneven heat exchange, affecting the conversion efficiency and service life of the catalyst.
An SCR device is designed, which includes a cooling device, including a base body with an annular cavity and a baffle extending axially, which separates the cavity into a plurality of cooling medium flow channels to ensure uniform flow of the cooling medium and with the base body. Carry out heat exchange.
The uniform flow and heat exchange of cooling medium are achieved, the temperature of the SCR carrier is reduced, the conversion efficiency of the catalyst is improved, the service life is extended, and the emission of pollutants is reduced.
Smart Images
Figure CN222363043U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vehicles, in particular to an SCR device, a post-processing system and a vehicle. Background Art
[0002] At present, the National VI after-treatment system is usually composed of DOC (Diesel Oxidation Catalyst), DPF (Diesel Particulate Filter) and SCR (Selective Catalytic Reduction). The exhaust gas flows through DOC, DPF and SCR in sequence. During regeneration, the SCR passively receives high-temperature gas from the DPF, causing the SCR temperature to reach above 650°C, which in turn causes the after-treatment shell temperature to be too high, increases the risk of failure of peripheral components, causes unnecessary high-temperature thermal aging to the SCR, and affects the service life of the SCR. At the same time, high temperature causes the SCR catalyst conversion efficiency to decrease and increases pollutant emissions.
[0003] In this regard, the prior art provides a cooling system for an SCR, in which a shell and an SCR box form an annular cavity, and a coolant enters the cavity through a water inlet pipe and flows out from a water outlet pipe, and is used to adjust the temperature of the SCR box and the catalyst arranged in the SCR box. However, there is a problem that the water inlet pipe and the water outlet pipe are respectively located on both sides of the cavity, and the flow of the coolant in the cavity is uneven, which may cause the coolant flow rate at some positions to be large, while the coolant flow rate at other positions is small, and even the coolant at some positions may hardly flow, resulting in uneven heat exchange. Utility Model Content
[0004] According to one aspect of the utility model, the utility model provides an SCR device to solve the problem of uneven heat exchange caused by uneven flow of cooling liquid in the cavity in the prior art.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] The SCR device includes an SCR carrier and a cooling device, wherein the cooling device includes:
[0007] A substrate, which is sleeved on the SCR carrier and has an annular cavity;
[0008] A plurality of baffles are provided, each of which extends along the axial direction of the substrate, and is arranged in the annular cavity at intervals along the circumferential direction of the substrate, and divides the annular cavity into a plurality of cooling medium flow channels, and each of the plurality of cooling medium flow channels is used for cooling medium to pass through so as to perform heat exchange between the cooling medium and the substrate.
[0009] As a preferred solution of the SCR device, the baffle is made of a heat-conducting material.
[0010] As a preferred solution for the SCR device, the cooling device also includes a shunt pipe, which is annular and sleeved on the SCR carrier, and the plurality of baffles are connected to the shunt pipe. The shunt pipe is used to connect to a cooling medium supply device, and the inner cavity of the shunt pipe is used for cooling medium to enter. The wall of the shunt pipe is provided with a plurality of through holes, and the plurality of through holes are connected to the plurality of cooling medium flow channels in a one-to-one correspondence.
[0011] As a preferred solution of the SCR device, the cooling device further includes a plurality of inlet pipes connected to the shunt pipe, the shunt pipe is connected to the cooling medium supply device through the plurality of inlet pipes, and the plurality of inlet pipes are spaced apart along the circumferential direction of the shunt pipe.
[0012] As a preferred solution of the SCR device, the cooling device also includes a ring pipe, which is sleeved on the SCR carrier, and the inner cavity of the ring pipe is simultaneously connected to the multiple cooling medium flow channels, and the inner cavity of the ring pipe is used for the cooling medium in the cooling medium flow channels to enter.
[0013] As a preferred solution for the SCR device, the cooling device also includes multiple outlet pipes connected to the ring pipe, the inner cavities of the multiple outlet pipes are used for the cooling medium in the inner cavity of the ring pipe to enter, and the multiple outlet pipes are arranged at intervals along the circumferential direction of the ring pipe.
[0014] As a preferred solution of the SCR device, a gasket is provided between the substrate and the SCR carrier.
[0015] As a preferred solution for the SCR device, the outer wall of the substrate is provided with a thermal insulation layer.
[0016] According to another aspect of the present invention, a post-treatment system is provided, comprising the above-mentioned SCR device, and further comprising a DOC and a DPF, wherein the DOC, the DPF and the SCR device are connected in sequence.
[0017] According to another aspect of the utility model, a vehicle is provided, comprising the above-mentioned after-treatment system and an engine, wherein the engine is connected to the after-treatment system.
[0018] The beneficial effects of the utility model are:
[0019] The utility model provides an SCR device, including an SCR carrier, and also including a cooling device, the cooling device including a substrate and a baffle, wherein the substrate is sleeved on the SCR carrier and has an annular cavity; a plurality of baffles are provided, the plurality of baffles all extend along the axial direction of the substrate, and the plurality of baffles are arranged in the annular cavity at intervals along the circumferential direction of the substrate, and the annular cavity is divided into a plurality of cooling medium flow channels, the plurality of cooling medium flow channels are all used for cooling medium to pass through, so that the cooling medium and the substrate perform heat exchange, thereby cooling the substrate, and further reducing the temperature of the SCR carrier, and reducing the temperature of the catalyst, so as to ensure the catalytic efficiency. In addition, since the plurality of baffles divide the annular cavity into a plurality of cooling medium flow channels, and each cooling medium flow channel has cooling medium passing through, the cooling medium can flow evenly in the entire annular cavity, avoiding uneven heat exchange.
[0020] The utility model also provides a post-treatment system, including the above-mentioned SCR device, and also including DOC, DPF and a mixer, wherein the DOC, DPF, mixer and SCR device are connected in sequence. In the SCR device, multiple cooling medium flow channels are used for cooling medium to pass through, so that the cooling medium and the substrate perform heat exchange, thereby cooling the substrate, and further reducing the temperature of the SCR carrier, and reducing the temperature of the catalyst to ensure the catalytic efficiency; in addition, each cooling medium flow channel has cooling medium passing through, which can make the cooling medium flow evenly in the entire annular cavity to avoid uneven heat exchange.
[0021] The utility model also provides a vehicle, comprising the above-mentioned post-processing system and an engine, wherein the engine is connected to the post-processing system. In the post-processing system, the SCR device has uniform heat exchange, which can effectively reduce the temperature of the catalyst to ensure the catalytic efficiency, thereby reducing the emission of pollutant gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a structural schematic diagram of a post-processing system in an embodiment of the utility model;
[0023] Figure 2 It is a structural schematic diagram of the SCR device in the embodiment of the utility model;
[0024] Figure 3 It is a partial structural schematic diagram of the SCR device in the embodiment of the utility model;
[0025] Figure 4 It is a structural schematic diagram of the shunt pipe in the embodiment of the utility model;
[0026] Figure 5 It is a structural schematic diagram of the ring tube in the embodiment of the utility model.
[0027] In the figure:
[0028] 100, cooling device; 110, base; 111, annular cavity; 112, cooling medium flow channel; 120, baffle; 130, shunt pipe; 131, through hole; 140, inlet pipe; 150, annular pipe; 160, outlet pipe;
[0029] 200, SCR carrier;
[0030] 300, padding;
[0031] 400, insulation layer;
[0032] 500, SCR housing;
[0033] 600. Cooling medium supply equipment;
[0034] 700, DOC; 710, DRF; 720, mixer. DETAILED DESCRIPTION
[0035] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0036] In the description of the present invention, unless otherwise clearly specified 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 an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0037] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0038] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0039] In order to solve the problem of over-high temperature of SCR equipment during operation, the prior art provides a cooling system of SCR, in which a shell and an SCR box form an annular cavity, and coolant enters the cavity through an inlet pipe and flows out through an outlet pipe, so as to adjust the temperature of the SCR box and the catalyst arranged in the SCR box. However, there is a problem that the inlet pipe and the outlet pipe are respectively located on both sides of the cavity, and the flow of coolant in the cavity is uneven, which may cause a larger coolant flow at some positions and a smaller coolant flow at other positions, or even a situation in which the coolant hardly flows at some positions, resulting in uneven heat exchange.
[0040] In view of the above problems, this embodiment provides an SCR device to solve the problem of uneven heat exchange caused by uneven flow of coolant in the cavity in the prior art, and can be used in the field of vehicle technology.
[0041] Reference Figure 1-Figure 5 The SCR device includes an SCR carrier 200 and a cooling device 100. The cooling device 100 includes a substrate 110 and a baffle 120. The substrate 110 is sleeved on the SCR carrier 200 and has an annular cavity 111. A plurality of baffles 120 are provided. The plurality of baffles 120 extend along the axial direction of the substrate 110, and the plurality of baffles 120 are arranged in the annular cavity 111 at intervals along the circumferential direction of the substrate 110, and the annular cavity 111 is divided into a plurality of cooling medium flow channels 112. The plurality of cooling medium flow channels 112 are used for cooling medium to pass through, so that the cooling medium and the substrate 110 can exchange heat, thereby cooling the substrate 110, and further reducing the temperature of the SCR carrier 200, and reducing the temperature of the catalyst to ensure the catalytic efficiency. In addition, since the multiple baffles 120 divide the annular cavity 111 into multiple cooling medium flow channels 112, and each cooling medium flow channel 112 has cooling medium passing through, the cooling medium can flow evenly in the entire annular cavity 111, avoiding uneven heat exchange; at the same time, by setting multiple baffles 120, the overall structural strength of the base 110 can be improved.
[0042] The cooling medium may be a liquid cooling medium or a gas cooling medium. In this embodiment, a gas cooling medium is used. In order to reduce the cost, cold air may be used as the cooling medium.
[0043] Optionally, the baffle 120 is made of a heat-conducting material, so that the heat of the substrate 110 can be transferred to the baffle 120 , and the cooling medium can exchange heat with the baffle 120 , thereby increasing the heat exchange area of the cooling medium and improving the heat exchange efficiency.
[0044] Continue to refer to Figure 1-Figure 5 The cooling device 100 further includes a shunt pipe 130, which is annular and sleeved on the SCR carrier 200, and a plurality of baffles 120 are connected to the shunt pipe 130. The shunt pipe 130 is used to connect to the cooling medium supply device 600. In this embodiment, the cooling medium supply device 600 is a compressed air source. The inner cavity of the shunt pipe 130 is used for the cooling medium to enter. The wall of the shunt pipe 130 is provided with a plurality of through holes 131, and the plurality of through holes 131 are connected to the plurality of cooling medium channels 112 in a one-to-one correspondence, so that the cooling medium is transported to the inner cavity of the shunt pipe 130 through the cooling medium supply device 600, and enters the plurality of cooling medium channels 112 in sequence through the plurality of through holes 131. In addition, the annular shunt pipe 130 is sleeved on the SCR carrier 200, and the plurality of baffles 120 are connected to the shunt pipe 130, which can simplify the connection structure between the shunt pipe 130 and the plurality of baffles 120.
[0045] Continue to refer to Figure 1-Figure 5 The cooling device 100 further includes a plurality of inlet pipes 140 connected to the shunt pipe 130. The shunt pipe 130 is connected to the cooling medium supply device 600 through the plurality of inlet pipes 140. The cooling medium enters the inner cavity of the shunt pipe 130 through the inlet pipes 140. The plurality of inlet pipes 140 are arranged at intervals along the circumferential direction of the shunt pipe 130, so that the cooling medium can evenly enter different positions of the shunt pipe 130, which can further improve the uniformity of the intake air. In this embodiment, two inlet pipes 140 are provided, and the two inlet pipes 140 are respectively located on both sides of the shunt pipe 130.
[0046] Continue to refer to Figure 1-Figure 5 The cooling device 100 further includes a ring pipe 150, which is sleeved on the SCR carrier 200. The inner cavity of the ring pipe 150 is simultaneously connected to the plurality of cooling medium flow channels 112, and the inner cavity of the ring pipe 150 is used for the cooling medium in the cooling medium flow channels 112 to enter, so that the cooling medium is discharged from the cooling medium flow channels 112 to form a flow path of the cooling medium. In this embodiment, since the cooling medium is air, the ring pipe 150 can be connected to the exhaust pipe of the post-treatment system so that the air in the ring pipe 150 is directly discharged to the atmosphere through the exhaust pipe.
[0047] Optionally, the inner cavity wall cross-section of the annular tube 150 is arc-shaped to minimize the flow resistance of the cooling medium, and the inner cavity on the other side of the arc-shaped cavity wall is directly connected to the cooling medium flow channel 112, so that the cooling medium can directly enter the annular tube 150 to reduce resistance.
[0048] Continue to refer to Figure 1-Figure 5 The cooling device 100 further includes a plurality of outlet pipes 160 connected to the annular tube 150. The inner cavities of the plurality of outlet pipes 160 are all used for the cooling medium in the inner cavity of the annular tube 150 to enter. The plurality of outlet pipes 160 are arranged at intervals along the circumferential direction of the annular tube 150, so that the cooling medium in the inner cavity of the annular tube 150 can be discharged from the annular tube 150 from different places, which can further improve the uniformity of the cooling medium flow. In this embodiment, two outlet pipes 160 are provided, and the two outlet pipes 160 are respectively located on both sides of the annular tube 150.
[0049] Continue to refer to Figure 1-Figure 5 A gasket 300 is arranged between the substrate 110 and the SCR carrier 200. On the one hand, the thickness of the gasket 300 can be changed or a gasket 300 with higher elasticity can be used to adapt to substrates 110 and SCR carriers 200 of different sizes to avoid the SCR carrier 200 from moving relative to the substrate 110; on the other hand, a buffer can be provided for the substrate 110 and the SCR carrier 200 to avoid damage caused by collision between the two.
[0050] Continue to refer to Figure 1-Figure 5 In the SCR device, the catalytic efficiency of the catalyst should not be too high or too low. After the SCR device has been working for a period of time, its temperature is generally high, so it can be cooled by the above-mentioned cooling device 100. When the SCR device just starts working, its temperature is still low and it needs to be kept warm. In this regard, in this embodiment, the outer wall of the substrate 110 is covered with a heat preservation layer 400. In addition, in order to facilitate the installation of the SCR device and provide protection for the heat preservation layer 400, the outer side of the heat preservation layer 400 is covered with an SCR housing 500.
[0051] The present embodiment also provides a post-treatment system, including the above-mentioned SCR device, and also including DOC700 and DPF710, and DOC700, DPF710 and SCR device are connected in sequence. In addition, in some embodiments, a mixer 720 can also be set between DPF710 and SCR device. In the SCR device, multiple cooling medium flow channels 112 are used for cooling medium to pass through, so that the cooling medium and the substrate 110 can exchange heat, thereby cooling the substrate 110, and further reducing the temperature of the SCR carrier 200, and reducing the temperature of the catalyst to ensure the catalytic efficiency; in addition, each cooling medium flow channel 112 will have cooling medium passing through, which can make the cooling medium flow evenly in the annular cavity 111 to avoid uneven heat exchange.
[0052] This embodiment also provides a vehicle, including the above-mentioned post-treatment system, and also including an engine, which is connected to the post-treatment system. In the post-treatment system, the SCR device has uniform heat exchange, which can effectively reduce the temperature of the catalyst to ensure the catalytic efficiency, thereby reducing the emission of pollutant gases.
[0053] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.
Claims
1. An SCR device, comprising an SCR carrier (200), characterized in that: The device further comprises a cooling device (100), wherein the cooling device (100) comprises: A substrate (110) is sleeved on the SCR carrier (200) and has an annular cavity (111); A plurality of baffles (120) are provided, each of the baffles (120) extending in the axial direction of the substrate (110), and each of the baffles (120) is arranged in the annular cavity (111) at intervals along the circumferential direction of the substrate (110), and the annular cavity (111) is divided into a plurality of cooling medium flow channels (112), and each of the plurality of cooling medium flow channels (112) is used for cooling medium to pass through, so that the cooling medium and the substrate (110) can exchange heat.
2. The SCR device according to claim 1, characterized in that: The baffle (120) is made of heat-conducting material.
3. The SCR device according to claim 1, characterized in that: The cooling device (100) further comprises a shunt pipe (130), the shunt pipe (130) is annular and sleeved on the SCR carrier (200), the plurality of baffles (120) are connected to the shunt pipe (130), the shunt pipe (130) is used to connect to a cooling medium supply device (600), and the inner cavity of the shunt pipe (130) is used for cooling medium to enter, the pipe wall of the shunt pipe (130) is provided with a plurality of through holes (131), and the plurality of through holes (131) are connected to the plurality of cooling medium flow channels (112) in a one-to-one correspondence.
4. The SCR device according to claim 3, characterized in that: The cooling device (100) further comprises a plurality of inlet pipes (140) connected to the shunt pipe (130); the shunt pipe (130) is connected to the cooling medium supply device (600) via the plurality of inlet pipes (140); and the plurality of inlet pipes (140) are arranged at intervals along the circumferential direction of the shunt pipe (130).
5. The SCR device according to claim 1, characterized in that: The cooling device (100) further comprises a ring pipe (150), wherein the ring pipe (150) is sleeved on the SCR carrier (200), the inner cavity of the ring pipe (150) is simultaneously connected to a plurality of the cooling medium flow channels (112), and the inner cavity of the ring pipe (150) is used for the cooling medium in the cooling medium flow channels (112) to enter.
6. The SCR device according to claim 5, characterized in that: The cooling device (100) further comprises a plurality of outlet pipes (160) connected to the annular tube (150); the inner cavities of the plurality of outlet pipes (160) are all used for the cooling medium in the inner cavity of the annular tube (150) to enter; and the plurality of outlet pipes (160) are arranged at intervals along the circumferential direction of the annular tube (150).
7. The SCR device according to any one of claims 1 to 6, characterized in that: A gasket (300) is provided between the substrate (110) and the SCR carrier (200).
8. The SCR device according to any one of claims 1 to 6, characterized in that: The outer wall of the base body (110) is provided with a thermal insulation layer (400).
9. A post-processing system, characterized in that: The invention comprises the SCR device according to any one of claims 1 to 8, and further comprises a DOC (700) and a DPF (710), wherein the DOC (700), the DPF (710) and the SCR device are connected in sequence.
10. A vehicle, characterized in that The aftertreatment system according to claim 9 further comprises an engine connected to the aftertreatment system.