Catalytic device for treating tail gas of aero-engine test bed

Abstract

The utility model discloses a catalytic device for treating tail gas of an aero-engine test bed. The catalytic device is installed in an exhaust tower of the aero-engine test bed and located at an outlet of an injection cylinder. The catalytic device comprises a fixed frame and a catalyst module arranged in the fixed frame; the catalyst module comprises a circle of catalyst units arranged in the circumferential direction, a circular exhaust cavity is formed in the middle of each catalyst unit, and the exhaust cavities are connected with the injection barrel. The problems that an existing device is low in treatment efficiency, difficult to disassemble and replace and the like are effectively solved.

Description

Technical Field

[0001] The utility model relates to the field of aero-engine test runs, in particular to a catalytic device for treating the exhaust gas of an aero-engine test stand. Background Art

[0002] During the operation of an aero-engine test stand, black and yellow smoke and pungent odors are generated. After analysis, its main components are nitrogen oxides (NOx), sulfur oxides (SOx), carbon monoxide (CO), VOCs, particulate matter (PM), etc. To effectively treat the exhaust gas, a catalyst is introduced for reaction to effectively reduce the concentration of harmful components in the exhaust gas. However, under different catalyst arrangement structures, the contact area, flow rate, and viscous resistance between the exhaust gas and the catalyst will vary. Therefore, by designing the arrangement structure of the catalyst carrier frame, the contact area between the catalyst and the exhaust gas is increased to improve the exhaust gas treatment efficiency. How to design the catalyst carrier frame structure is a key technical problem under the premise of ensuring the quality and dosage of the catalyst.

[0003] In the traditional exhaust gas treatment of an aero-engine ground indoor test stand, the arrangement structure of the catalyst generally adopts a simple planar stacking method. This arrangement structure will not only reduce the contact area between the exhaust gas and the catalyst, but also increase the gas flow resistance, making it difficult to select a fan, and seriously reducing the removal efficiency of harmful components in the exhaust gas by the catalyst. In addition, the catalyst has a ceramic matrix structure, which is fragile and has a service time limit. When applying the catalyst on the market, it is mostly used in small frames (about 2m in length). After encapsulating the catalyst, it can be simply stacked. When disassembling, the whole catalyst frame can be lifted away. However, when applied to a large frame (more than 6m), at this time, the frame including the catalyst is extremely heavy, making it difficult for manpower to carry and disassemble. The current frame is obviously no longer applicable. Under the large-size frame, the maintenance and replacement during the disassembly of the catalyst obviously become a problem. Summary of the Invention

[0004] The purpose of the utility model is to provide a catalytic device for treating the exhaust gas of an aero-engine test stand to solve the problems of low treatment efficiency and difficult disassembly and replacement existing in the prior art.

[0005] To achieve the above task, the utility model adopts the following technical solutions:

[0006] A catalytic device for treating the exhaust gas of an aero-engine test stand, the catalytic device is installed in the exhaust tower of the aero-engine test stand, at the outlet of the ejector tube; the catalytic device includes a fixed frame and a catalyst module arranged in the fixed frame;

[0007] The catalyst module includes a circle of catalyst units arranged along the circumferential direction, and a circular exhaust cavity is formed in the middle of the catalyst unit, and the exhaust cavity is connected to the ejector tube.

[0008] Furthermore, the catalyst unit has a fan-shaped or triangular structure, and adjacent catalyst units are connected by an arc segment. All the catalyst units together form a gear-shaped or star-shaped arrangement structure.

[0009] Furthermore, each of the catalyst units includes a pair of catalyst frames, and catalyst blocks are modularly arranged inside the catalyst frames.

[0010] Furthermore, for the catalyst unit with a triangular structure, the front ends of the two catalyst frames in each catalyst unit are connected, and the rear ends are respectively connected to adjacent catalyst units through an arc segment.

[0011] Furthermore, for the catalyst unit with a fan-shaped structure, the distance between the front ends of the two catalyst frames in each catalyst unit is greater than the distance between the rear ends. The front ends of the two catalyst frames are connected by an arc-shaped connecting segment, and the rear ends are respectively connected to adjacent catalyst units through an arc segment.

[0012] Furthermore, the catalyst frame includes a first outer frame and a second outer frame, where:

[0013] Multiple rows of horizontal first support plates are spaced in the first outer frame, and second support plates corresponding to the first support plates are arranged in the second outer frame; multiple rows of vertical partition plates are also arranged in the first outer frame. The first outer frame is divided into a grid shape by the first support plates and the partition plates.

[0014] Furthermore, the modular catalyst blocks are arranged between the first outer frame and the second outer frame. Each catalyst block is supported by the first support plate and the second support plate, and adjacent catalyst blocks in the horizontal direction are separated by the partition plates.

[0015] Furthermore, the first outer frame is directly welded or welded to the fixed frame using fixing rods, and the second outer frame is connected to the fixed frame using bolts.

[0016] Furthermore, the first support plate extends out of the side surface of the first outer frame by an amount A; the second support plate extends out of the side surface of the second outer frame by an amount B, and B > A.

[0017] Compared with the prior art, the present utility model has the following technical features:

[0018] 1. The present utility model aims at treating the exhaust gas of an aero-engine test stand using adsorption materials such as catalysts, and improves the exhaust gas treatment efficiency by changing the bearing frame structure of the catalyst-type adsorption material. It can be applied to most of the retrofitted and newly built aero-engine test stands on the market.

[0019] 2. On the premise of using catalysts of the same quality and dosage, the tail gas treatment efficiency has been greatly improved, and the concentration of the tail gas discharged into the atmosphere and other external characteristics (such as pungent smell, black and yellow smoke, etc.) have all decreased significantly.

[0020] 3. Solve the problems of too low flow rate, too large resistance, too small contact area, and too low catalytic efficiency of the waste gas after passing through the catalyst; under the large-size framework, the catalyst is convenient for individual disassembly, thus reducing the difficulty of maintenance and replacement. Brief Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the installation and application of the catalytic device of the present utility model;

[0022] Figure 2 It is a three-dimensional schematic diagram of the catalyst module with a gear-shaped arrangement structure;

[0023] Figure 3 It is a front view of the catalyst module with a gear-shaped arrangement structure;

[0024] Figure 4 It is a three-dimensional schematic diagram of the catalyst module with a star-shaped arrangement structure;

[0025] Figure 5 It is a front view of the catalyst module with a star-wheel-shaped arrangement structure;

[0026] Figure 6 It is a front view of the catalyst frame;

[0027] Figure 7 It is a side view of the catalyst frame;

[0028] Figure 8 It is a three-dimensional schematic diagram of the cooperation between the catalyst frame and the catalyst block;

[0029] Figure 9 It is a side view of the cooperation between the catalyst frame and the catalyst block.

[0030] Explanation of the reference numerals in the figure: 1 Exhaust tower of the test bench, 2 Ejector tube, 3 Fixed frame, 4 Catalyst module, 5 Catalyst unit, 6 Arc section, 7 Exhaust cavity, 8 Catalyst frame, 9 Catalyst block, 10 Connection section, 11 Fixed rod, 12 First outer frame, 13 Second outer frame, 14 First support plate, 15 Second support plate, 16 Partition plate, 17 Angle steel. Detailed Description of the Invention

[0031] In the present utility model, catalyst convex arrangement structures of different shapes are arranged outside the ejector cylinder 2 of an aeroengine test stand, including but not limited to shapes such as the sun or a gear. This convex arrangement structure expands the cross-sectional area in the vertical direction compared to the planar stacking structure. And due to the existence of gaps, the structure is looser than the planar stacking structure. Therefore, when gas flows through, it can ensure the maximum contact area between the tail gas and the catalyst to the greatest extent, reduce the flow rate and viscous resistance, reduce the amount of catalyst used under the premise of the same quality catalyst, and improve the tail gas removal efficiency. Second, under the large-size framework, the single catalyst bearing structure is designed as a spliced framework, which is extremely easy to disassemble, facilitating the later maintenance and replacement of the catalyst.

[0032] See the appendix Figures 1 to 9 , the present utility model provides a catalytic device for treating the tail gas of an aeroengine test stand. The catalytic device is installed in the exhaust tower 1 of the aeroengine test stand and is located at the outlet of the ejector cylinder 2; the catalytic device includes a fixed framework 3 and a catalyst module 4 arranged within the fixed framework 3;

[0033] The catalyst module 4 includes a circle of catalyst units 5 arranged along the circumferential direction. The catalyst units 5 are in a fan-shaped or triangular structure. Adjacent catalyst units 5 are connected by an arc section 6. A circular exhaust cavity 7 is formed in the middle of the catalyst unit 5. The exhaust cavity 7 is connected to the ejector cylinder 2, and the two can be coaxially arranged; all the catalyst units 5 together form a gear-shaped or star-shaped arrangement structure.

[0034] Each of the catalyst units 5 includes a pair of catalyst frameworks 8, and catalyst blocks 9 are modularly arranged within the catalyst frameworks 8.

[0035] Among them, for the catalyst unit 5 with a triangular structure, the front ends of the two catalyst frameworks 8 in each catalyst unit 5 are connected, and the rear ends are respectively connected to adjacent catalyst units 5 through an arc section 6.

[0036] Among them, for the catalyst unit 5 with a fan-shaped structure, the distance between the front ends of the two catalyst frameworks 8 in each catalyst unit 5 is greater than the distance between the rear ends. The front ends of the two catalyst frameworks 8 are connected by an arc-shaped connecting section 10, and the rear ends are respectively connected to adjacent catalyst units 5 through an arc section 6.

[0037] See the appendix Figure 5 , in this solution, the catalyst unit 5 is supported and fixed on the fixed framework 3 by a fixing rod 11.

[0038] In this solution, the test tail gas discharged from the ejector cylinder 2 enters the exhaust cavity 7, and then passes through the catalyst unit 5 for catalytic treatment and then escapes into the test stand exhaust tower 1. See the appendix Figure 3 、 Figure 4 、 Figure 5 andFigure 7 as indicated by the arrow in

[0039] See Figure 6 , which is a schematic structural diagram of the catalyst frame 8.

[0040] In this embodiment, a catalyst frame 8 is provided, including a first outer frame 12 and a second outer frame 13 with a rectangular frame structure, where:

[0041] The first outer frame 12 and the second outer frame 13 have the same length and width dimensions, and the thickness of the first outer frame 12 is greater than that of the second outer frame 13; multiple rows of horizontal first support plates 14 are arranged at intervals in the first outer frame 12, and second support plates 15 corresponding to the first support plates 14 are arranged in the second outer frame 13; wherein, multiple rows of vertical partition plates 16 are further arranged in the first outer frame 12, and the interior of the first outer frame 12 is divided into a grid shape by the first support plates 14 and the partition plates 16; the partition plates 16 also play a role in vertical support.

[0042] Optionally, both the first support plates 14 and the second support plates 15 are fixed in the first outer frame 12 and the second outer frame 13 by using support angle steels 17.

[0043] Referring to the attached drawings, modular catalyst blocks 9 are arranged between the first outer frame 12 and the second outer frame 13. Each catalyst block 9 is supported by the first support plates 14 and the second support plates 15, and the adjacent catalyst blocks 9 in the horizontal direction are separated by the partition plates 16. During installation, the first outer frame 12 is directly welded or welded to the fixed frame 3 by using fixing rods 11, and the second outer frame 13 is connected to the fixed frame 3 by using bolts.

[0044] In a preferred embodiment, the first support plate 14 extends out of the side surface of the first outer frame 12 by an amount A; the second support plate 15 extends out of the side surface of the second outer frame 13 by an amount B, and B > A; through this design method, a larger accommodation space can be provided between the first outer frame 12 and the second outer frame 13 to adapt to catalyst blocks 9 of different size specifications.

[0045] As Figure 8 shown in the example, it is a catalyst frame 8 that can carry 25 fully encapsulated catalyst blocks 9. If a catalyst block 9 is damaged or fails, the second outer frame 13 can be removed. At this time, due to the support force of the first support plates 14, the catalyst blocks 9 will not fall, and only the damaged or failed catalyst blocks 9 need to be replaced. After the repair is completed, the second outer frame 13 is restored.

[0046] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included within the protection scope of the present application.

Claims

1. A catalytic device for treating the exhaust gas of an aeroengine test stand, characterized in that, The catalytic device is installed in the exhaust tower (1) of an aero-engine test stand and is located at the outlet of the ejector tube (2); the catalytic device includes a fixed frame (3) and a catalyst module (4) arranged within the fixed frame (3). The catalyst module (4) includes a circle of catalyst units (5) arranged circumferentially. A circular exhaust cavity (7) is formed in the middle of the catalyst unit (5), and the exhaust cavity (7) is connected to the ejector tube (2).

2. The catalytic device for treating the exhaust gas of an aeroengine test stand according to claim 1, characterized in that, The catalyst unit (5) has a fan-shaped or triangular structure. Adjacent catalyst units (5) are connected by an arc segment (6), and all the catalyst units (5) together form a gear-shaped or star-shaped arrangement structure.

3. The catalytic device for treating the tail gas of an aero-engine test stand according to claim 2, characterized in that, Each of the catalyst units (5) includes a pair of catalyst frames (8), and catalyst blocks (9) are modularly arranged within the catalyst frames (8).

4. The catalytic device for treating the exhaust gas of an aero-engine test stand according to claim 3, wherein For the catalyst unit (5) with a triangular structure, the fronts of the two catalyst frames (8) in each catalyst unit (5) are connected, and the rears are respectively connected to adjacent catalyst units (5) through an arc segment (6).

5. The catalytic device for treating the tail gas of an aero-engine test stand according to claim 3, wherein For the catalyst unit (5) with a fan-shaped structure, the distance between the fronts of the two catalyst frames (8) in each catalyst unit (5) is greater than the distance between the rears. The fronts of the two catalyst frames (8) are connected by an arc-shaped connecting segment (10), and the rears are respectively connected to adjacent catalyst units (5) through an arc segment (6).

6. The catalytic device for treating the exhaust gas of an aero-engine test bench according to claim 3, wherein, The catalyst frame (8) includes a first outer frame (12) and a second outer frame (13), where:[[]]END]] In the first outer frame (12), multiple rows of horizontal first support plates (14) are arranged at intervals. Second support plates (15) corresponding to the first support plates (14) are arranged in the second outer frame (13); multiple rows of vertical partition plates (16) are also arranged in the first outer frame (12). The first outer frame (12) is divided into a grid shape by the first support plates (14) and the partition plates (16).

7. The catalytic device for treating the tail gas of an aero-engine test stand according to claim 6, characterized in that, The modular catalyst blocks (9) are arranged between the first outer frame (12) and the second outer frame (13). Each catalyst block (9) is supported by the first support plate (14) and the second support plate (15), and adjacent catalyst blocks (9) in the horizontal direction are separated by the partition plate (16).

8. The catalytic device for treating the tail gas of an aero-engine test stand according to claim 6, characterized in that, The first outer frame (12) is directly welded or welded to the fixed frame (3) using a fixing rod (11), and the second outer frame (13) is bolted to the fixed frame (3).

9. The catalytic device for treating the tail gas of an aero-engine test stand according to claim 6, characterized in that, The first support plate (14) extends out of the side of the first outer frame (12) by an amount A; the second support plate (15) extends out of the side of the second outer frame (13) by an amount B, and B > A.

Images