Natural gas engine postprocessor, engine and vehicle

Abstract

The invention relates to the technical field of tail gas treatment, in particular to a natural gas engine postprocessor, an engine and a vehicle, the natural gas engine postprocessor comprises a shell, the shell is provided with a hollow cavity, the shell comprises a first barrel, a carrier packaging body and a second barrel which are coaxially arranged and sequentially connected, and a catalyst is arranged on the inner side of the carrier packaging body; the end cover assembly is arranged at one end, far away from the carrier packaging body, of the first cylinder body, and the end cover assembly is used for blocking the end part of the hollow cavity; the air inlet assembly is arranged on the first cylinder body, and the air inlet assembly is communicated with the exhaust end of the engine and the first cylinder body; and the exhaust assembly communicates with the end, away from the carrier packaging body, of the second barrel, is used for exhausting the treated tail gas and extends in the direction, facing the first barrel, of the second barrel. The weight and the size can be reduced, installation is convenient, and cost is low.

Description

Technical Field

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

[0002] With the development of the automotive industry, more and more vehicles have entered the fields of production and life, providing great convenience for people's travel and logistics transportation. In order to reduce the environmental pollution caused by vehicle exhaust emissions, engines using natural gas as fuel have been put into use. Natural gas engines have the following advantages:

[0003] Outstanding environmental protection performance: Low carbon emissions, CO2 emission reduction: The carbon-hydrogen ratio of natural gas (CH4) is lower than that of gasoline and diesel, and the CO2 emission after combustion is reduced by 20%-25% (Well-to-Wheel full life cycle measurement). Near-zero particulate matter: Without sulfide and aromatic components, the PM emission is only 1 / 10 of that of diesel engines, meeting the strictest national VI / Euro VI standards. Low pollutant gas emissions: Stoichiometric combustion + three-way catalyst (TWC) can reduce NOx to less than 0.4 g / kWh, and the EGR technology further inhibits the generation of thermal NOx. The methane slip problem is significantly improved through high-pressure direct injection and combustion chamber optimization (such as turbulence enhancement design). Moreover, it has significant economic advantages, low fuel cost, and no SCR urea system, resulting in low maintenance costs. In order to further treat the exhaust gas of the engine and thus further improve the cleanliness of the exhaust gas, natural gas engines all adopt the technical route of stoichiometric combustion + EGR system, and the post-treatment device is all packaged in a box type. The box type packaging is prone to heat accumulation inside the box, and heat dissipation design needs to be strengthened (such as adding air ducts / cooling plates), which may increase energy consumption. The box structure of steel frame + sound insulation material leads to an increase in weight, affecting the vehicle load or mobility. Moreover, the volume of the box is large, occupying more space and being inconvenient for installation.

[0004] Therefore, a post-treatment device for a natural gas engine, an engine and a vehicle are needed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a post-treatment device for a natural gas engine, an engine and a vehicle, which can reduce weight and volume, be convenient for installation, and have a lower cost.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A post-treatment device for a natural gas engine, comprising:

[0008] A housing, the housing having a hollow cavity, the housing comprising a first cylinder, a carrier encapsulation body and a second cylinder which are coaxially arranged and connected in sequence, and a catalyst is arranged inside the carrier encapsulation body;

[0009] The end cover assembly is arranged at one end of the first cylinder body away from the carrier encapsulation body, and the end cover assembly is used to seal the end of the hollow cavity;

[0010] The intake assembly is arranged on the first cylinder body, and the intake assembly is communicated with the exhaust end of the engine and the first cylinder body;

[0011] The exhaust assembly is arranged to communicate with one end of the second cylinder body away from the carrier encapsulation body, and is used to discharge the treated tail gas, and the exhaust assembly extends along the direction of the second cylinder body towards the first cylinder body.

[0012] In some embodiments, the exhaust assembly includes an air outlet cone assembly and an air outlet pipe assembly which are communicated with each other. The air outlet cone assembly is communicated with the second cylinder body, and the air outlet pipe assembly extends along the direction of the second cylinder body towards the first cylinder body.

[0013] In some embodiments, the air outlet cone assembly and the air outlet pipe assembly are communicated through a connecting elbow pipe.

[0014] In some embodiments, a support bracket is arranged between the carrier encapsulation body and the air outlet pipe assembly. One end of the support bracket is connected with the carrier encapsulation body, and the other end of the support bracket is connected with the air outlet pipe assembly.

[0015] In some embodiments, a heat insulation cover bracket assembly is arranged on the air outlet cone assembly, and the heat insulation cover bracket assembly is used to install a side heat insulation cover.

[0016] In some embodiments, a first heat preservation shell assembly is sleeved outside the carrier encapsulation body.

[0017] In some embodiments, a second heat preservation shell assembly is sleeved outside the first cylinder body.

[0018] In some embodiments, a sealing retaining ring is arranged between the carrier encapsulation body and the second cylinder body.

[0019] The engine includes an engine body and the natural gas engine after-treatment device as described above, and the natural gas engine after-treatment device is communicated with the exhaust end of the engine body.

[0020] The vehicle includes a chassis and the engine as described above, and the engine is arranged on the chassis.

[0021] The beneficial effects of the present invention:

[0022] A natural gas engine aftertreatment device provided by the present invention, the housing includes a first cylinder body, a carrier encapsulation body and a second cylinder body which are coaxially arranged and connected in sequence. A catalyst is arranged inside the carrier encapsulation body. An end cover assembly is arranged at one end of the first cylinder body away from the carrier encapsulation body, and the end cover assembly is used to seal the end of the hollow cavity. An intake assembly is arranged on the first cylinder body, and the intake assembly is communicated with the exhaust end of the engine and the first cylinder body. An exhaust assembly is arranged to be communicated with one end of the second cylinder body away from the carrier encapsulation body for discharging the treated tail gas. Since the natural gas engine aftertreatment device cancels the box encapsulation, and the exhaust assembly extends along the direction of the second cylinder body towards the first cylinder body, by reasonably arranging the positions between the exhaust assembly and the housing, the weight and volume can be reduced, the installation is convenient, the heat dissipation does not need to be arranged, and the cost is relatively low.

[0023] An engine provided by the present invention includes an engine body and the natural gas engine aftertreatment device as described above, which can reduce the weight and volume, is convenient for installation, and has a relatively low cost.

[0024] A vehicle provided by the present invention includes a chassis and the engine as described above, which can reduce the weight and volume, is convenient for installation, and has a relatively low cost. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0026] Figure 1 It is a schematic diagram of a natural gas engine aftertreatment device of the present invention.

[0027] In the figure:

[0028] 1. Housing; 11. First cylinder body; 111. Mounting bracket; 12. First thermal insulation shell assembly; 13. Second cylinder body; 2. Exhaust assembly; 21. Exhaust cone assembly; 211. Heat insulation cover bracket assembly; 22. Connecting elbow; 23. Exhaust pipe assembly; 3. Support bracket; 4. Intake assembly; 5. End cover assembly; 6. Sealing ring. Detailed Embodiments

[0029] Before explaining any embodiment of the present application in detail, it should be understood that the present application is not limited to the structural details and component arrangements described in the following description or shown in the above drawings.

[0030] In this application, the terms "comprise", "include", "have" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising that element.

[0031] In this application, the terms "connect", "combine", "couple", "mount" can be direct connection, combination, coupling or mounting, or can be indirect connection, combination, coupling or mounting. Among them, by way of example, direct connection means that two parts or components are connected together without the need for an intermediate member, and indirect connection means that two parts or components are respectively connected to at least one intermediate member, and these two parts or components are connected through the intermediate member. In addition, "connect" and "couple" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0032] In this application, those of ordinary skill in the art will understand that the functions performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0033] In this application, the orientation terms such as "upper", "lower", "left", "right", "front", "rear", etc. are described based on the orientation and positional relationship shown in the drawings, and should not be construed as a limitation on the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that one element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element. It should also be understood that the orientation terms such as upper side, lower side, left side, right side, front side, rear side, etc. not only represent the positive orientation, but can also be understood as the side orientation. For example, the lower side can include directly below, lower left, lower right, lower front and lower rear, etc.

[0034] When treating the exhaust gas of a natural gas engine, in order to reduce the weight and volume of the post-processor of the natural gas engine, facilitate installation, and have a relatively low cost. As Figure 1 shown, the present invention provides a post-processor for a natural gas engine. The post-processor for a natural gas engine includes a housing 1, an end cover assembly 5, an intake assembly 4 and an exhaust assembly 2.

[0035] Among them, the housing 1 has a hollow cavity. The housing 1 includes a first cylinder 11, a carrier encapsulation body, and a second cylinder 13 that are coaxially arranged and connected in sequence. A catalyst is provided inside the carrier encapsulation body. The end cover assembly 5 is arranged at one end of the first cylinder 11 away from the carrier encapsulation body, and the end cover assembly 5 is used to block the end of the hollow cavity. The intake assembly 4 is arranged on the first cylinder 11, and the intake assembly 4 is communicated with the exhaust end of the engine and the first cylinder 11. The exhaust assembly 2 is arranged to communicate with one end of the second cylinder 13 away from the carrier encapsulation body, and is used to discharge the treated tail gas. The exhaust assembly 2 extends along the direction of the second cylinder 13 towards the first cylinder 11.

[0036] Since the post-treatment device for natural gas engines eliminates the box encapsulation, and the exhaust assembly 2 extends along the direction of the second cylinder 13 towards the first cylinder 11, by reasonably arranging the positions between the exhaust assembly 2 and the housing 1, the weight and volume can be reduced, which is convenient for installation, without the need to arrange heat dissipation, and the cost is relatively low.

[0037] In some embodiments, the exhaust assembly 2 includes an air outlet cone assembly 21 and an air outlet pipe assembly 23 that are communicated with each other. The air outlet cone assembly 21 is communicated with the second cylinder 13, and the air outlet pipe assembly 23 extends along the direction of the second cylinder 13 towards the first cylinder 11. By providing the air outlet cone assembly 21, it is convenient to dock with the second cylinder 13. By providing the air outlet pipe assembly 23, the tail gas can be discharged along a set path and direction after being treated.

[0038] In some embodiments, the air outlet cone assembly 21 and the air outlet pipe assembly 23 are communicated through a connecting elbow 22. By providing the connecting elbow 22, the air outlet pipe assembly 23 can be arranged to extend along the direction of the second cylinder 13 towards the first cylinder 11, thereby greatly reducing the volume of the post-treatment device for natural gas engines, reducing the encapsulation cost, and saving the vehicle space.

[0039] In some embodiments, a support bracket 3 is arranged between the carrier encapsulation body and the air outlet pipe assembly 23. One end of the support bracket 3 is connected to the carrier encapsulation body, and the other end of the support bracket 3 is connected to the air outlet pipe assembly 23. By providing the support bracket 3, the air outlet pipe assembly 23 can be effectively supported, thereby ensuring the structural stability of the post-treatment device for natural gas engines.

[0040] In some embodiments, a heat insulation cover bracket assembly 211 is arranged on the air outlet cone assembly 21, and the heat insulation cover bracket assembly 211 is used to install the side heat insulation cover. By using the heat insulation cover bracket to fixedly install the side heat insulation cover, the side heat insulation cover is just set on the air outlet cone assembly 21, playing a role of heat insulation, preventing rain, flying stones, heat damage, and protecting the post-treatment temperature, while achieving aesthetics and an integrated design.

[0041] In some embodiments, a first heat insulation housing assembly 12 is sleeved outside the carrier encapsulation body. By providing the first heat insulation housing assembly 12, the tail gas temperature at the carrier encapsulation body can be ensured, heat dissipation can be reduced, so as to ensure that the tail gas is effectively catalytically decomposed at the carrier encapsulation body.

[0042] In some embodiments, a second heat insulation housing assembly is sleeved outside the first cylinder body 11. By providing the second heat insulation housing assembly, the tail gas temperature entering the first cylinder body 11 can be ensured, and the environment for subsequent catalytic decomposition of the tail gas can be ensured to meet the requirements.

[0043] In some embodiments, a sealing ring 6 is provided between the carrier encapsulation body and the second cylinder body 13. In this embodiment, the sealing ring 6 is made of a metal material. By providing the sealing ring 6 between the carrier encapsulation body and the second cylinder body 13, the gap between the carrier encapsulation body and the second cylinder body 13 can be effectively blocked, so as to prevent the tail gas from escaping from the gap between the carrier encapsulation body and the second cylinder body 13.

[0044] In some embodiments, an oxygen sensor is provided at the gas outlet end of the gas outlet pipe assembly 23. The oxygen sensor can be used to detect whether the tail gas meets the standards, so as to accurately obtain whether the tail gas treatment meets the emission standards.

[0045] In some embodiments, a mounting bracket 111 is fixedly provided on the first cylinder body 11. The mounting bracket 111 is used for fixedly connecting with the vehicle body, so as to lock the position of the natural gas engine after-treatment device on the vehicle body.

[0046] The working principle of this natural gas engine after-treatment device is as follows:

[0047] The exhaust gas enters the mixing chamber of the first cylinder body 11 from the intake hole of the intake assembly 4 and diffuses and mixes downward, and then enters the carrier encapsulation body from the mixing chamber for reaction. The first cylinder body 11 and the carrier encapsulation body are coaxially arranged with a small gap and fast heat conduction, and the heat transfer loss of the tail gas is small, which improves the conversion efficiency to a certain extent. The carrier encapsulation body can oxidize unburned methane, hydrocarbons and carbon monoxide. Then the gas enters the mixing chamber of the second cylinder body 13 from the carrier encapsulation body for mixing, and then enters the exhaust assembly 2 from the mixing chamber of the second cylinder body 13. During this process, the gas finally exits from the end of the exhaust assembly 2 communicating with the atmosphere.

[0048] This embodiment also provides an engine, including an engine body and the above natural gas engine after-treatment device. The natural gas engine after-treatment device is communicated with the exhaust end of the engine body, which can reduce the weight and volume, is convenient for installation, and has a low cost.

[0049] This embodiment also provides a vehicle, including a chassis and the above engine. The engine is arranged on the chassis, which can reduce the weight and volume, is convenient for installation, and has a low cost.

[0050] 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, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent replacements, improvements, etc. 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. Natural gas engine aftertreatment device, characterized in that, Comprising: A housing (1), the housing (1) having a hollow cavity, the housing (1) including a first cylinder (11), a carrier encapsulation body, and a second cylinder (13) that are coaxially arranged and sequentially connected, and a catalyst being provided inside the carrier encapsulation body; An end cap assembly (5), the end cap assembly (5) being provided at one end of the first cylinder (11) away from the carrier encapsulation body, and the end cap assembly (5) being used to block the end of the hollow cavity; An intake assembly (4), the intake assembly (4) being provided on the first cylinder (11), and the intake assembly (4) being in communication with the exhaust end of the engine and the first cylinder (11); An exhaust assembly (2), the exhaust assembly (2) being provided in communication with one end of the second cylinder (13) away from the carrier encapsulation body for discharging the treated exhaust gas, and the exhaust assembly (2) extending along the direction of the second cylinder (13) towards the first cylinder (11).

2. The post-treatment device for a natural gas engine according to claim 1, wherein, The exhaust assembly (2) includes an air outlet cone assembly (21) and an air outlet pipe assembly (23) that are in communication with each other, the air outlet cone assembly (21) being in communication with the second cylinder (13), and the air outlet pipe assembly (23) extending along the direction of the second cylinder (13) towards the first cylinder (11).

3. The post-processor for a natural gas engine according to claim 2, wherein, The air outlet cone assembly (21) and the air outlet pipe assembly (23) are in communication through a connecting elbow (22).

4. The natural gas engine post-processor according to claim 2, characterized in that: A support bracket (3) is provided between the carrier encapsulation body and the air outlet pipe assembly (23), one end of the support bracket (3) being connected to the carrier encapsulation body, and the other end of the support bracket (3) being connected to the air outlet pipe assembly (23).

5. The post-treatment device for a natural gas engine according to claim 2, characterized in that, An insulation cover bracket assembly (211) is provided on the air outlet cone assembly (21), and the insulation cover bracket assembly (211) is used to mount a side insulation cover.

6. The post-processor for a natural gas engine according to claim 1, wherein A first heat insulation shell assembly (12) is sleeved outside the carrier encapsulation body.

7. The post-processor for a natural gas engine according to claim 1, characterized in that, A second heat insulation shell assembly is sleeved outside the first cylinder (11).

8. The post-treatment device for a natural gas engine according to claim 1, characterized in that, A sealing ring (6) is provided between the carrier encapsulation body and the second cylinder (13).

9. An engine, characterized in that, Comprising an engine body and a natural gas engine post-processor as described in any one of claims 1-8, the natural gas engine post-processor being in communication with the exhaust end of the engine body.

10. A vehicle, characterized in that Comprising a chassis and an engine as described in claim 9, the engine being provided on the chassis.

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