A device for treating exhaust gas between baffles suitable for an aero-engine test stand

Abstract

The utility model relates to a baffle plate inter tail gas treatment device suitable for aeroengine test bed belongs to tail gas treatment technical field, has solved existing aeroengine test bed tail gas treatment device pressure loss is bigger, tail gas is difficult to smoothly arrange to the export of exhaust tower, existing aeroengine test bed tail gas treatment's time is shorter, and the problem of unideal management effect. The utility model discloses a tail gas treatment device, including exhaust tower and catalytic treatment unit, catalytic treatment unit sets up on the gas passage between the sound -proof barrier of exhaust tower, and at least by three blocks constitutes reverse 'L' type structure, and each block is by n flow channel baffle, 2n catalyst layer, catalyst layer is located baffle both sides, and the flow channel of adjacent block baffle is blocked complementary. Through the flow channel baffle and catalyst layer design in the block, optimize the tail gas flow, reduce the flow velocity of tail gas through catalyst layer, and further reduce the pressure drop, prolong the processing time, improve the tail gas treatment efficiency and effect.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas treatment technology, and in particular to an exhaust gas treatment device between baffles suitable for aircraft engine test stands. Background Technology

[0002] During the operation of aero-engine test benches, especially under high-load conditions such as afterburner combustion, black and yellow smoke and irritating gases are emitted. Test analysis reveals that these emissions are mainly composed of various harmful compounds, including but not limited to nitrogen oxides (NOx), sulfur oxides (SOx), carbon monoxide (CO), volatile organic compounds (VOCs), and particulate matter (PM). These compounds have a significant impact on the environment; therefore, controlling and purifying engine exhaust emissions is a crucial task in the aero-engine development process.

[0003] Currently, a common exhaust gas purification technology in the industry involves passing exhaust gas through a device loaded with a catalyst, using physical adsorption and catalysis to remove the aforementioned harmful components. Specifically, by delivering the exhaust gas into an exhaust gas treatment device, the catalyst within catalytically decomposes nitrogen oxides, VOCs, and PM, thereby effectively purifying the exhaust gas.

[0004] However, some technical challenges and limitations remain in the exhaust gas treatment work of aero-engine test stands. The exhaust gas generated by aero-engine test stands is mostly discharged directly through an exhaust tower, resulting in relatively low acceptable pressure loss. In practice, it has been found that existing catalyst units are typically honeycomb structures with a high drag coefficient. If multiple layers of catalyst are directly placed inside the ejector tube through which the high-speed exhaust gas flows, it will cause significant pressure loss, making it difficult for the exhaust gas to be smoothly discharged to the exhaust tower outlet. If the catalyst is placed near the ejector tube outlet, an additional platform and support structure are required, and the flow field at this location is more turbulent, making it difficult for the catalyst to fully exert its effect.

[0005] Therefore, in order to meet the requirements of aero-engine test stands for exhaust gas treatment, there is an urgent need to develop a new type of exhaust gas treatment device. This device can effectively extend the exhaust gas treatment time, improve the treatment effect, and at the same time reduce the pressure loss introduced by exhaust gas treatment, ensuring that the existing performance indicators of the test stand are not affected. Utility Model Content

[0006] In view of the above analysis, the present invention aims to provide a baffle-type exhaust gas treatment device suitable for aero-engine test stands, in order to solve at least one of the following problems: (1) the pressure loss of the existing aero-engine test stand exhaust gas treatment device is large and the exhaust gas is difficult to be discharged smoothly to the outlet of the exhaust tower; (2) the existing aero-engine test stand exhaust gas treatment time is short and the treatment effect is not good.

[0007] This utility model embodiment provides a baffle-type exhaust gas treatment device suitable for aero-engine test bench, including an exhaust tower and a catalytic treatment unit;

[0008] The exhaust tower includes a horizontal section and a vertical section; at least three noise-reducing baffles are alternately arranged on the two opposite side walls of the vertical section to form an "L"-shaped loop for exhaust gas treatment; the catalytic treatment unit is matched with the "L"-shaped loop so that all the exhaust gas enters the catalytic treatment unit for treatment.

[0009] Furthermore, the catalytic processing unit includes three sections: section one, section two, and section three.

[0010] Block 1 is located at the bottom of the catalytic processing unit; Block 2 and Block 1 are on the same horizontal plane and are adjacent to each other; Block 3 is located above Block 2 and is vertically aligned with Block 2; adjacent blocks are fixedly or movably connected.

[0011] Furthermore, the catalytic processing unit adopts a modular design, comprising at least three blocks, which can be disassembled, stacked, replaced, and / or added or removed.

[0012] Furthermore, each block consists of multiple parallel catalyst layers and multiple flow channel baffles spaced apart between the catalyst layers around the block; the flow channel baffles divide the block into multiple flow channels to guide gas through for catalytic reaction.

[0013] Furthermore, the flow channel baffle is divided into two types: an inlet plate and an outlet plate, which are respectively set on the segmented inlet and outlet surfaces. The inlet plate and the outlet plate are arranged alternately so that the flow channels of the inlet plate and the outlet plate complement each other, ensuring that the airflow can pass through the catalyst layer along the side of the larger flow channel.

[0014] Furthermore, the flow channel baffles on the contact surfaces of adjacent segments are configured identically.

[0015] Furthermore, the catalyst layer includes a catalyst mounting frame and a catalyst block; the catalyst block is fixed on the catalyst mounting frame.

[0016] Furthermore, the gas in the catalyst layer can only flow in the direction perpendicular to the catalyst layer.

[0017] Furthermore, each segment has a sidewall plate on its periphery, which is fixed together with the flow channel baffle and catalyst mounting frame to form the overall frame of the segment.

[0018] Furthermore, the sidewall panel is customized according to the gas flow path to ensure that the gas flows along a predetermined route.

[0019] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0020] 1. This invention reduces pressure loss introduced by exhaust gas treatment, ensuring that the existing performance indicators of the test stand are not affected. Existing exhaust gas treatment devices on aero-engine test stands suffer significant pressure loss, making it difficult for exhaust gas to be smoothly discharged to the exhaust tower outlet. The exhaust gas treatment device of this invention, through an innovative segmented design, achieves uniform distribution and flow of exhaust gas within the device, reducing the flow velocity of exhaust gas through the catalyst layer, thereby reducing local pressure concentration caused by a single channel and effectively mitigating pressure loss. The complementary layout of baffles in adjacent segmented flow channels reduces pressure drop caused by direct obstruction by the baffles. These designs reduce pressure loss introduced by exhaust gas treatment, ensuring that exhaust gas treatment does not affect the existing performance of the test stand.

[0021] 2. Effectively extends the exhaust gas treatment time and improves treatment efficiency. This utility model's exhaust gas treatment device divides the device into multiple sections, ensuring uniform distribution and flow of exhaust gas within the device. This reduces the velocity of the exhaust gas passing through the catalyst layer, thereby extending the residence time of the exhaust gas within the device, i.e., the exhaust gas treatment time. The complementary design of the flow channel baffles guides the exhaust gas into unblocked flow channels, increasing the contact time between the exhaust gas and the catalyst, thus improving treatment efficiency. Furthermore, the catalyst layer is strategically placed on both sides of the flow channel baffles, preventing high-speed airflow from directly passing through the catalyst layer and causing significant pressure loss. This also maximizes the contact area between the exhaust gas and the catalyst, enhancing the treatment effect.

[0022] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing this invention. The objectives and other advantages of this invention can be realized and obtained from the details specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0023] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0024] Figure 1 This is a schematic diagram of the exhaust gas treatment device of this utility model;

[0025] Figure 2 This is a schematic diagram of the catalytic treatment unit of this utility model;

[0026] Figure 3 for Figure 1 AA sectional view unfolded diagram;

[0027] Figure 4 This is a schematic diagram of the flow channel baffle air inlet plate of this utility model;

[0028] Figure 5This is a schematic diagram of the outlet plate of the flow channel baffle of this utility model.

[0029] Figure label:

[0030] 1-Injector tube, 2-Exhaust tower, 3-Silencer baffle; 4-Catalytic treatment unit; 41-Block 1; 42-Block 2; 43-Block 3; 411-Flow channel baffle 1; 412-Catalyst layer 1; 413-Side wall plate; 421-Flow channel baffle 2; 422-Catalyst layer 2; 431-Flow channel baffle 3; 432-Catalyst layer 3; 441-Flow channel baffle 4. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0032] A baffle-type exhaust gas treatment device suitable for aircraft engine test stands includes an exhaust tower 2 and a catalytic treatment unit 4;

[0033] The exhaust tower 2 includes a horizontal section and a vertical section; at least three noise-reducing baffles 3 are alternately arranged on the two opposite side walls of the vertical section to form an "L"-shaped loop for exhaust gas treatment; the catalytic treatment unit 4 is matched with the "L"-shaped loop so that all the exhaust gas enters the catalytic treatment unit 4 for treatment.

[0034] Furthermore, the catalytic processing unit 4 includes a first block 41, a second block 42, and a third block 43;

[0035] Block 1 41 is located at the bottom of the catalytic processing unit 4; Block 2 42 and Block 1 41 are on the same horizontal plane and are adjacent to each other; Block 3 43 is located above Block 2 42 and is vertically aligned with Block 2 42.

[0036] Furthermore, there are fixed or movable connections between adjacent blocks.

[0037] Furthermore, the catalytic treatment unit 4 is disposed on the gas passage between the sound-absorbing baffles 3 in the vertical part of the exhaust tower 2.

[0038] Furthermore, the catalytic processing unit 4 adopts a modular design, including at least three blocks, which can be disassembled, stacked, replaced, and / or added or removed.

[0039] Furthermore, each block consists of multiple parallel catalyst layers and multiple flow channel baffles spaced apart between the catalyst layers around the block; the flow channel baffles divide the block into multiple flow channels to guide gas through for catalytic reaction.

[0040] Furthermore, the flow channel baffle is divided into an inlet plate and an outlet plate, which are respectively disposed on the segmented inlet and outlet surfaces, and the inlet plate and outlet plate are arranged alternately so that the flow channels of the inlet plate and the outlet plate complement each other to ensure that the airflow can pass through the catalyst layer.

[0041] Figure 3 for Figure 1 AA sectional view of exhaust gas treatment device (along) Figure 1 (Top view after being cut open by the dashed line). In the figure, flow channel baffle 1 411 and flow channel baffle 2 421 are respectively set on the air inlet and air outlet surfaces of segment 41. The two types of baffles are arranged alternately to ensure that their flow channels complement each other. This design ensures that the airflow can pass smoothly through the catalyst layer. Similarly, flow channel baffle 2 421 and flow channel baffle 3 431 are in segment 42, and flow channel baffle 3 431 and flow channel baffle 441 are in segment 43, all arranged in the same way.

[0042] Figure 4 and Figure 5 The structures of the intake plate and the outlet plate are shown respectively (the two structures are interchangeable, as long as the blocked flow channels are complementary). In the figure, the flow channels blocked by flow channel baffle 1 411 and flow channel baffle 2 421 are complementary.

[0043] Furthermore, the flow channel baffles on the contact surfaces of adjacent segments are configured identically.

[0044] Specifically, the catalyst layer includes a catalyst mounting frame and a catalyst block; the catalyst block is fixed on the catalyst mounting frame.

[0045] Furthermore, the width of the flow channel baffle is thicker than the catalyst layer to enhance the structure.

[0046] Furthermore, each segment has a sidewall plate 413 on its periphery, which is fixed together with the flow channel baffle and catalyst mounting frame to form the overall frame of the segment.

[0047] Furthermore, the sidewall plate 413 is customized according to the gas flow path to ensure that the gas flows along a predetermined route. It passes sequentially through the first block 41, the second block 42, and the third block 43 of the catalytic treatment unit 4, and finally returns to the exhaust tower 2 for exhaust gas treatment.

[0048] In a preferred embodiment, the three outer frame segments of the catalytic processing unit 4 are of the same size, and the corresponding flow channel baffles are of the same size, so as to achieve coordination and consistency of the device and facilitate standardized production and maintenance.

[0049] Furthermore, the gas in the catalyst layer can only flow in the direction perpendicular to the catalyst layer.

[0050] In a preferred embodiment, the catalyst layer is arranged in a straight line in both the horizontal and vertical directions. This design simplifies the processing, reduces production costs, and ensures the effective flow of exhaust gas in the catalyst layer.

[0051] In one possible embodiment, the catalyst layer is arranged in a wavy or zigzag pattern in both the horizontal and vertical directions. This design increases the contact area between the exhaust gas and the catalyst, which helps to reduce exhaust gas velocity and pressure loss, thereby improving the treatment effect. However, it also increases the amount of catalyst used and the structural complexity, thus increasing processing and material costs.

[0052] Furthermore, during the exhaust gas treatment process, the exhaust gas first diffuses through the ejector tube 1 inside the horizontal part of the exhaust tower 2 to the lower end of the vertical part of the exhaust tower 2, and is then guided by the silencer baffle 3 into the catalytic treatment unit 4.

[0053] Within the catalytic processing unit 4, such as Figure 3 As shown, the exhaust gas is blocked by the flow channel baffle of segment 1 41 and passes through catalyst layer 1 412. Then it enters segment 2 42 and segment 3 43, passes through their respective flow channel baffles and catalyst layers in sequence, and is finally discharged after being changed in direction by the end flow channel baffle of segment 3 43, and returns to exhaust tower 2.

[0054] This invention, through an innovative segmented design, achieves uniform distribution and flow of exhaust gas within the device, reducing the velocity of exhaust gas passing through the catalyst layer and thus extending the residence time of exhaust gas within the device. This reduces localized pressure concentration caused by a single channel, effectively mitigating pressure loss. The complementary design of the baffles in adjacent segmented flow channels guides exhaust gas into unobstructed flow channels, prolonging the contact time between the exhaust gas and the catalyst, and further reducing the velocity of exhaust gas passing through the catalyst layer, thereby reducing the pressure drop caused by direct obstruction by the baffles. By staggering the flow channel baffles within each segment, the exhaust gas is forced to pass through the catalyst layer multiple times, achieving efficient and low-resistance exhaust gas treatment.

[0055] Compared with existing technologies, the exhaust gas treatment device provided in this embodiment is arranged between the silencer baffles of the exhaust tower of an aero-engine test stand. By optimizing the internal structure and flow channel design, and utilizing the staggered arrangement of baffles, the exhaust gas is forced to pass through the catalyst layer at low speed multiple times, reducing pressure and ensuring sufficient reaction, thus achieving efficient treatment. Ultimately, it can improve the treatment effect of exhaust gas and reduce harmful emissions while introducing lower pressure loss, without affecting the test stand's performance, all while keeping the catalyst parameters unchanged.

[0056] The exhaust gas treatment device of this utility model will be further described below through specific embodiments.

[0057] Example 1

[0058] An exhaust gas treatment device between baffles of an aero-engine test stand includes an exhaust tower 2 and a catalytic treatment unit 4.

[0059] The exhaust tower 2 includes a horizontal section and a vertical section; at least three noise-reducing baffles 3 are alternately arranged on the two opposite side walls of the vertical section to form an "L"-shaped loop for exhaust gas treatment; the catalytic treatment unit 4 is matched with the "L"-shaped loop so that all the exhaust gas enters the catalytic treatment unit 4 for treatment.

[0060] Furthermore, the catalytic treatment unit 4 is simplified into an inverted L-shaped structure with a length of 14m, a width of 10m, and a height of 10m. Segment 1 (41), segment 2 (42), and segment 3 (43) have identical external dimensions, all being cuboids with a length of 14m, a width of 5m, and a height of 5m. Each internal baffle is 1m wide, the catalyst layer is 0.25m thick, and the catalyst layer frame is made of 8mm thick carbon steel plate. The flow channels blocked by the baffles of every two adjacent segments are complementary.

[0061] The exhaust gas inlet velocity between the noise-absorbing baffles is 10 m / s. Because the flow channel baffle blocks half of the original flow channel, the velocity entering the exhaust gas treatment device increases to 20 m / s. In this embodiment, the single flow channel area is 5 m². 2 The area of ​​a single flow channel passing through the catalyst layer is 25m². 2 According to the law of conservation of flow, when the area increases from 5m²... 2 Change to 25m 2 Then, the flow velocity also changed from 20 m / s to 4 m / s, so the flow velocity through the catalyst layer was 4 m / s.

[0062] Since the pressure loss of porous media catalysts is proportional to the square of the flow velocity, the original flow velocity was 10 m / s, and the current flow velocity is 4 m / s. Therefore, the pressure loss of the exhaust gas treatment device in this embodiment is reduced to 0.16 times the original, and the exhaust gas treatment time is increased to 2.5 times the original. It can significantly reduce the black and yellow smoke and irritating gases in the exhaust gas, while not affecting the test run of the aircraft engine.

[0063] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A baffle-type exhaust gas treatment device suitable for aero-engine test benches, characterized in that, It includes an exhaust tower (2) and a catalytic converter (4); The exhaust tower (2) includes a horizontal section and a vertical section; at least three noise-absorbing baffles (3) are alternately arranged on the two opposite side walls of the vertical section so that the exhaust gas forms an "L"-shaped loop for exhaust gas treatment; the catalytic treatment unit (4) is matched with the "L"-shaped loop so that all the exhaust gas enters the catalytic treatment unit (4) for treatment.

2. The exhaust gas treatment device according to claim 1, characterized in that, The catalytic processing unit (4) includes block one (41), block two (42) and block three (43); Block 1 (41) is located at the bottom of the catalytic processing unit (4); Block 2 (42) and Block 1 (41) are on the same horizontal plane and are adjacent to each other; Block 3 (43) is located above Block 2 (42) and is vertically aligned with Block 2 (42); Adjacent blocks are either fixed or movable.

3. The exhaust gas treatment device according to claim 1 or 2, characterized in that, The catalytic processing unit (4) adopts a modular design and includes at least three blocks, which can be disassembled, stacked, replaced and / or added or removed.

4. The exhaust gas treatment device according to claim 3, characterized in that, Each block consists of multiple parallel catalyst layers and multiple flow channel baffles spaced apart between the catalyst layers around the block; the flow channel baffles divide the block into multiple flow channels to guide gas through for catalytic reaction.

5. The exhaust gas treatment device according to claim 4, characterized in that, The flow channel baffle is divided into two types: an inlet plate and an outlet plate, which are respectively set on the inlet and outlet surfaces of the segmented air inlet and outlet surfaces. The inlet plate and the outlet plate are arranged alternately so that the flow channels of the inlet plate and the outlet plate complement each other, so that the airflow can pass through the catalyst layer along the side of the larger flow channel.

6. The exhaust gas treatment device according to claim 4, characterized in that, The flow channel baffles on the contact surfaces of adjacent blocks are set in the same way.

7. The exhaust gas treatment device according to claim 4, characterized in that, The catalyst layer includes a catalyst mounting frame and a catalyst block; the catalyst block is fixed on the catalyst mounting frame.

8. The exhaust gas treatment device according to claim 4, characterized in that, Gas can only flow in the direction perpendicular to the catalyst layer.

9. The exhaust gas treatment device according to claim 4, characterized in that, Each segment has a side wall plate (413) around its perimeter, which is fixed together with the flow channel baffle and catalyst mounting frame to form the overall frame of the segment.

10. The exhaust gas treatment device according to claim 9, characterized in that, The sidewall panel (413) is customized according to the gas flow path to ensure that the gas flows along a predetermined route.

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