Novel double-parallel high-power catalytic converter

Abstract

The utility model discloses a novel double-parallel-connection high-power catalyst, belongs to the technical field of diesel engines, and solves the problem that a traditional catalyst is low in catalytic efficiency. The novel double-parallel high-power catalytic converter comprises an air inlet cover, a plurality of catalytic converter bodies are arranged at one end of the air inlet cover, and the ends, away from the air inlet cover, of the catalytic converter bodies jointly communicate with an exhaust cover. A diesel oxidation catalyst, a diesel particle filter and a selective catalytic reducer are installed in each catalyst body in the airflow direction, and a mixing cavity for communicating the multiple catalyst bodies is formed between the air inlet cover and the exhaust cover. A spoiler dividing the mixing cavity into a first cavity and a second cavity is arranged in the mixing cavity, the first cavity is communicated with the air inlet cover through a plurality of catalyst bodies, and the second cavity is communicated with the exhaust cover through a plurality of catalyst bodies. According to the novel double-parallel-connection high-power catalytic converter, the catalytic efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of diesel engines, and more specifically, to a novel dual-parallel high-power catalyst. Background Art

[0002] With the rapid development of the transportation industry, the automobile industry has become one of my country's pillar industries. Diesel locomotives are becoming increasingly popular due to their good fuel economy, excellent power, and reduced nitrogen dioxide emissions. However, the emission requirements for diesel engines are becoming increasingly stringent worldwide.

[0003] The catalyst is a simple and effective aftertreatment device for reducing diesel engine particulate emissions. Conventional high-power catalysts utilize a U-shaped series structure. However, as diesel engine emissions increase, exhaust gas entering the catalyst cannot flow evenly across the catalyst surface, reducing catalytic efficiency. Furthermore, excessive exhaust gas flowing through the catalyst can cause localized overheating, leading to catalyst aging and shortening of the catalyst's service life. Therefore, the development and design of a new high-power catalyst is urgently needed. Utility Model Content

[0004] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art and provide a new type of dual-parallel high-power catalyst, which can make the exhaust gas entering the catalyst flow evenly through the catalyst surface, thereby improving the catalytic efficiency. The uniform exhaust gas distribution can also reduce local overheating and extend the service life of the catalyst.

[0005] The technical solution of the present utility model is as follows: a new type of dual-parallel high-power catalyst, including an air intake hood, one end of the air intake hood is provided with a plurality of catalyst bodies, and the ends of the plurality of catalyst bodies away from the air intake hood are commonly connected to an exhaust hood, and a diesel oxidation catalyst, a diesel particulate filter, and a selective catalytic reduction device are installed in each of the catalyst bodies along the air flow direction, and a mixing cavity connecting the plurality of catalyst bodies is provided between the air intake hood and the exhaust hood, and a spoiler is provided in the mixing cavity to separate the mixing cavity into a first cavity and a second cavity, the first cavity is connected to the air intake hood through the plurality of catalyst bodies, and the second cavity is connected to the exhaust hood through the plurality of catalyst bodies, and a mixing tube connecting the first cavity and the second cavity is provided on the spoiler, and the mixing tube is provided with a plurality of air inlet holes at one end of the first cavity, and a plurality of air outlet holes at one end of the mixing tube is provided with

[0006] Furthermore, the plurality of air inlet holes are evenly distributed in a circular pattern on the outer wall of the mixing tube.

[0007] Furthermore, a guide plate is provided on one side of each of the air inlet holes, and one end of the guide plate extends obliquely toward the middle position of the air inlet hole.

[0008] Furthermore, the mixing tube is provided with a plurality of auxiliary air inlet holes at one end of the first cavity, the auxiliary air inlet holes are located on one side of the air inlet hole, and the plurality of auxiliary air inlet tubes are evenly arranged on the outer wall of the mixing tube in a circular shape.

[0009] Furthermore, the plurality of air outlet holes are arranged circumferentially on the mixing tube in groups of two.

[0010] Furthermore, the spoiler includes a partition plate, both ends of the partition plate are provided with a connecting plate, the cross section of the connecting plate is semicircular, and the central axis of the catalyst body is perpendicular to the connecting plate.

[0011] Furthermore, a steel mesh is provided in the mixing tube.

[0012] Furthermore, a baffle is provided in the second cavity, and the baffle is located on one side of the air outlet.

[0013] Furthermore, the height of the baffle is smaller than the diameter of the catalyst body, and the height of the baffle is greater than the height of the air outlet.

[0014] Furthermore, a nozzle connected to the mixing pipe is provided on the top of the mixing cavity.

[0015] Beneficial effects

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The utility model discloses a new type of dual-parallel high-power catalyst, which realizes uniform distribution of exhaust gas in the catalyst body by installing two catalyst bodies in parallel, so that the exhaust gas entering the catalyst body flows evenly through the catalyst surface, thereby improving the catalytic efficiency. In addition, the uniform exhaust gas distribution can avoid local overheating of the catalyst body, effectively extending the service life of the catalyst. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0020] Figure 3 Schematic diagram of the three-dimensional structure of the spoiler and the mixing tube in the utility model;

[0021] Figure 4 This is a schematic diagram of the airflow direction of the present utility model;

[0022] Figure 5 The temperature distribution diagram of the diesel oxidation catalyst when the utility model and the traditional catalyst are catalyzed;

[0023] Figure 6 This is a temperature distribution diagram of the diesel particulate filter during catalysis of the utility model and the traditional catalyst;

[0024] Figure 7 The temperature distribution diagram of the selective catalytic reduction device during catalysis of the utility model and the traditional catalyst;

[0025] Figure 8 The figure is a relationship diagram between the carrier specifications and catalyst utilization of each catalyst in the present invention;

[0026] Figure 9 This is the pressure distribution diagram of the catalyst body in this utility model.

[0027] Among them: 1-catalyst body, 2-air intake hood, 3-exhaust hood, 4-diesel oxidation catalyst, 5-diesel particulate filter, 6-selective catalytic reduction device, 7-mixing cavity, 71-first cavity, 72-second cavity, 8-mixing pipe, 9-intake hole, 10-anti-outlet hole, 11-guide plate, 12-auxiliary intake hole, 13-steel mesh, 14-baffle, 15-spoiler, 16-nozzle, 17-partition plate, 18-connecting plate. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0029] See Figure 1-9A new type of dual-parallel high-power catalyst includes an air intake cover 2, one end of which is provided with multiple catalyst bodies 1, and there are two catalyst bodies 1; the ends of the multiple catalyst bodies 1 away from the air intake cover 2 are commonly connected to the exhaust cover 3, and a diesel oxidation catalyst (DOC) 4, a diesel particulate filter (DPF) 5, and a selective catalytic reduction (SCR) 6 are installed in each catalyst body 1 along the air flow direction; a mixing cavity 7 that connects the multiple catalyst bodies 1 is provided between the air intake cover 2 and the exhaust cover 3, and a spoiler 15 that divides the mixing cavity 7 into a first cavity 71 and a second cavity 72 is provided in the mixing cavity 7. The first cavity 71 is connected to the air intake cover 2 through the multiple catalyst bodies 1, and the second cavity 72 is connected to the exhaust cover 3 through the multiple catalyst bodies 1. A mixing pipe 8 that connects the first cavity 71 and the second cavity 72 is provided on the spoiler 15. The two ends of 8 are respectively connected to the inner walls of the two ends of the mixing cavity 7; the mixing tube 8 is located at one end of the first cavity 71 and is provided with a plurality of air inlet holes 9, and the mixing tube 8 is located at one end of the second cavity 72 and is provided with a plurality of air outlet holes 10; the two ends of the two catalyst bodies 1 are respectively connected with the air inlet hood 2 and the exhaust hood 3 to realize the parallel connection of the two catalyst bodies 1. After the exhaust gas enters from the exhaust hood 2, it is diverted to flow to the two parallel catalyst bodies 1. The diverted exhaust gas passes through the diesel oxidation catalyst (DOC) 4 and the diesel particulate filter (DPF) 5 and then merges in the mixing cavity 7. Then the exhaust gas flows to the other end of the mixing cavity 7 through the mixing tube 8. After the exhaust gas flowing out of the mixing tube 8 is buffered and slowed down by the steel mesh 13 and the baffle 14, the exhaust gas is diverted to flow through the selective catalytic reduction (SCR) 6 in the two catalyst bodies 1, thereby achieving the purpose of pollution of micro-particle emissions from the diesel engine.

[0030] In this embodiment, multiple air inlet holes 9 are evenly arranged in a circle on the outer wall of the mixing tube 8; there are eight air inlet holes 9, and the multiple air inlet holes 9 divert the gas entering the mixing tube 8. By setting multiple air inlet holes 9, the size of the air inlet holes 9 is controlled, thereby accelerating the circulation of gas in the mixing tube 8, shortening the time required for the gas to pass through the mixing tube 8, and thus shortening the time required for catalysis.

[0031] In this embodiment, a guide vane 11 is provided on one side of each air inlet 9, and one end of the guide vane 11 extends obliquely toward the middle position of the air inlet 9, further accelerating the speed at which the gas enters the mixing tube 8 and further shortening the time required for catalysis.

[0032] In this embodiment, the mixing tube 8 is provided with a plurality of auxiliary air inlet holes 12 at one end of the first cavity 71. The auxiliary air inlet holes 12 are located on one side of the air inlet hole 9, and the plurality of auxiliary air inlet pipes 12 are evenly arranged in a circle on the outer wall of the mixing tube 8; the exhaust gas in the mixing cavity 7 can enter the mixing tube 7 through the auxiliary air inlet holes 12. The area of the auxiliary air inlet holes 12 is smaller than the area of the air inlet hole 9, which can further accelerate the flow rate of the gas in the mixing tube 8 and accelerate the speed of the gas passing through the mixing tube 8.

[0033] In this embodiment, a plurality of air outlet holes 10 are arranged circumferentially on the mixing tube 8 in groups of two; there are eight air outlet holes 10, which divert the gas coming out of the mixing tube 8, and the diverted gas collides with the baffle 14 and the inner wall of the mixing chamber 7, thereby achieving a buffering effect.

[0034] In this embodiment, the spoiler 15 includes a partition plate 17, and connecting plates 18 are provided at both ends of the partition plate 17. The cross-section of the connecting plate 18 is semicircular, and the central axis of the catalyst body 1 is perpendicular to the connecting plate 18; the spoiler 15 divides the mixing cavity 7 into a first cavity 71 and a second cavity 72. The first cavity 71 and the second cavity 72 are both closed cavities, and the first cavity 71 and the second cavity 72 are connected by a mixing tube 8 passing through the spoiler 15.

[0035] In this embodiment, a steel mesh 13 is provided in the mixing tube 8. The steel mesh 13 is installed at one end of the mixing tube 8 located in the second cavity 72, and the steel mesh 13 is located on one side of the air outlet 10, which plays a buffering and diversion role for the gas in the mixing tube 8, thereby effectively improving the catalytic efficiency.

[0036] In this embodiment, a baffle 14 is provided in the second cavity 72, and the baffle 14 is located on one side of the gas outlet 10; the baffle 14 acts as a buffer for the gas flowing out of the gas outlet 10, slowing down the flow rate of the gas to a certain extent, so that the gas can pass through the selective catalytic reduction device 6 more evenly, thereby effectively improving the catalytic efficiency.

[0037] In this embodiment, the height of the baffle 14 is smaller than the diameter of the catalyst body 1, and the height of the baffle 14 is greater than the height of the air outlet 10. Preferably, the height of the baffle 14 is equal to the height of half the diameter of the catalyst body 1. The baffle 14 of this height can buffer the gas while reserving sufficient space for the gas to flow to the selective catalytic reduction (SCR) 6, and the gas flow rate will not be accelerated due to the small space.

[0038] In this embodiment, a nozzle 16 connected to the mixing tube 8 is provided at the top of the mixing cavity 7. The nozzle 16 penetrates the inner wall of the mixing cavity 7 and is connected to the internal cavity of the mixing tube 8 for adding other catalysts into the mixing tube 8 from the nozzle 16.

[0039] refer to Figure 5-7 By rationally designing the shape, size and layout of the flow channel of the catalyst body 1, the exhaust gas entering the catalyst body 1 can flow evenly through the catalyst surface, effectively improving the catalytic efficiency. The uniform exhaust gas can also avoid local overheating of the catalyst, which can lead to catalyst aging, and effectively extend the service life of the catalyst body 1.

[0040] refer to Figure 8 The dual-parallel high-power catalyst uses ceramics, cordierite, and full-section precious metals as catalysts, and by optimizing the thickness and distribution of the catalyst coating, it can achieve effective conversion of harmful substances in the exhaust gas at a lower temperature, while improving the utilization rate and catalytic effect of the catalyst.

[0041] refer to Figure 9 On the premise of ensuring the catalytic efficiency of the catalyst, the pressure loss in the catalyst body 1 can be reduced by reducing the resistance of the flow channel in the catalyst body 1, thereby improving the output power of the engine; and the use of low-capacity materials to make the outer shell and inner core of the catalyst body 1 can reduce its heat loss and effectively improve the energy utilization efficiency.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention. These modifications and improvements will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A new type of dual parallel high-power catalyst, characterized in that: The invention comprises an air intake cover (2), wherein one end of the air intake cover (2) is provided with a plurality of catalyst bodies (1), and one end of the plurality of catalyst bodies (1) away from the air intake cover (2) is commonly connected to an exhaust cover (3), and a diesel oxidation catalyst (4), a diesel particulate filter (5), and a selective catalytic reduction device (6) are sequentially installed in each of the catalyst bodies (1) along the air flow direction, and a mixing cavity (7) for connecting the plurality of catalyst bodies (1) is provided between the air intake cover (2) and the exhaust cover (3), and a cavity (7) is provided in the mixing cavity (7) for dividing the mixing cavity (7) into a first cavity and a second cavity. The first cavity (71) is connected to the air intake hood (2) through a plurality of catalyst bodies (1), and the second cavity (72) is connected to the exhaust hood (3) through a plurality of catalyst bodies (1). The spoiler (15) is provided with a mixing tube (8) for connecting the first cavity (71) and the second cavity (72). The mixing tube (8) is located at one end of the first cavity (71) and is provided with a plurality of air inlet holes (9). The mixing tube (8) is located at one end of the second cavity (72) and is provided with a plurality of air outlet holes (10).

2. A novel dual-parallel high-power catalyst according to claim 1, characterized in that: The plurality of air inlet holes (9) are evenly distributed in a circular pattern on the outer wall of the mixing tube (8).

3. A novel dual-parallel high-power catalyst according to claim 2, characterized in that: A guide plate (11) is provided on one side of each air inlet (9), and one end of the guide plate (11) extends obliquely toward the middle position of the air inlet (9).

4. The novel dual-parallel high-power catalyst according to claim 2, characterized in that: The mixing tube (8) is provided with a plurality of auxiliary air inlet holes (12) at one end of the first cavity (71), the auxiliary air inlet holes (12) are located on one side of the air inlet hole (9), and the plurality of auxiliary air inlet tubes (12) are evenly arranged in a circular pattern on the outer wall of the mixing tube (8).

5. The novel dual-parallel high-power catalyst according to claim 1, characterized in that: The plurality of air outlet holes (10) are arranged in a group of two each in a circumferential direction on the mixing tube (8).

6. The novel dual-parallel high-power catalyst according to claim 1, characterized in that: The spoiler (15) includes a partition plate (17), both ends of which are provided with connecting plates (18), the cross section of the connecting plate (18) is semicircular, and the central axis of the catalyst body (1) is perpendicular to the connecting plate (18).

7. The novel dual-parallel high-power catalyst according to claim 1, characterized in that: A steel mesh (13) is provided in the mixing tube (8).

8. The novel dual-parallel high-power catalyst according to claim 1, characterized in that: A baffle (14) is provided in the second cavity (72), and the baffle (14) is located on one side of the air outlet (10).

9. The novel dual-parallel high-power catalyst according to claim 8, characterized in that: The height of the baffle (14) is smaller than the diameter of the catalyst body (1), and the height of the baffle (14) is greater than the height of the air outlet hole (10).

10. The novel dual-parallel high-power catalyst according to claim 1, characterized in that: A nozzle (16) communicating with the mixing pipe (8) is provided at the top of the mixing cavity (7).

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