Test bed injection cylinder with tail gas treatment function

Abstract

The invention discloses a test bed injection cylinder with a tail gas treatment function, belongs to the technical field of tail gas treatment of test bed injection cylinders, and aims to solve the problems that in the prior art, an injection cylinder cannot perform tail gas treatment, and newly added tail gas treatment equipment can influence a gas flow field of an original injection cylinder. The test bed injection cylinder comprises a front injection section and a tail gas treatment section, the tail gas treatment section comprises a treatment shell and a honeycomb catalyst module which are coaxially connected in the tail gas flowing direction, a catalyst containing hole is formed in the side wall of the treatment shell, the honeycomb catalyst module is installed in the catalyst containing hole, and the treatment shell provided with the honeycomb catalyst module is located in the exhaust tower. The tail gas treatment device can be used for tail gas treatment in the test bed injection cylinder.

Description

Technical Field

[0001] This invention belongs to the field of exhaust gas treatment technology for test bench ejectors, and particularly relates to a test bench ejector with exhaust gas treatment function. Background Technology

[0002] During the operation of an aircraft engine test stand, exhaust gases containing various pollutants are emitted, including nitrogen oxides (NOx). x It contains hydrocarbons (HC), carbon monoxide (CO), particulate matter (PM), etc. Its exhaust gas is characterized by high temperature and high flow rate, and produces an unpleasant odor and black / yellow smoke.

[0003] In order to control the exhaust gas flow and reduce the impact on the side wall of the exhaust tower, the conventional test bench ejector tube usually includes a front ejector section and an open diffuser connected in sequence along the exhaust gas flow direction. The open diffuser is a straight cylindrical structure with small holes on the wall. After the exhaust gas is turned by the open diffuser, it is discharged upward in the exhaust tower.

[0004] However, the above process cannot treat the pollutants in the exhaust gas. Adding an exhaust gas treatment device to the ejector tube of the test bench would require extensive modifications to the ejector tube, which would also increase the overall length of the ejector tube and the flow resistance of the exhaust gas, and change the gas flow field of the original ejector tube. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a test bench ejector with exhaust gas treatment function to solve the problems in the prior art where ejector cannot perform exhaust gas treatment and adding exhaust gas treatment equipment will affect the gas flow field of the original ejector.

[0006] This invention provides a test bench ejector tube with exhaust gas treatment function, including a front ejector section and an exhaust gas treatment section;

[0007] The exhaust gas treatment section includes a treatment housing and a honeycomb catalyst module coaxially connected along the exhaust gas flow direction. The side wall of the treatment housing has catalyst receiving holes, and the honeycomb catalyst module is installed in the catalyst receiving holes. The treatment housing with the honeycomb catalyst module is located in the exhaust tower.

[0008] Furthermore, the processing shell is a polygonal cylinder, with multiple catalyst receiving holes opened on each face of the polygonal cylinder.

[0009] Furthermore, the test stand ejector tube also includes a transition connection section located between the front ejector section and the processing housing.

[0010] Furthermore, the air intake end of the transition connecting section is circular, and the air outlet end of the transition connecting section is polygonal.

[0011] Furthermore, a polygonal guide cone is provided at the end of the exhaust gas treatment section, with the tip of the guide cone facing the air intake end of the exhaust gas treatment section.

[0012] Furthermore, the exhaust gas treatment section includes multiple treatment zones connected sequentially along the exhaust gas flow direction.

[0013] Furthermore, there are three treatment zones, and the exhaust gas treatment section includes a first treatment zone, a second treatment zone, and a third treatment zone connected sequentially along the exhaust gas flow direction.

[0014] Furthermore, along the direction of the intake end that gradually moves away from the exhaust gas treatment section, the opening ratio of the honeycomb catalyst module in the first treatment zone is greater than that in the second treatment zone, which is greater than that in the third treatment zone.

[0015] Furthermore, the test stand ejector also includes a drainage ring located within the exhaust gas treatment section.

[0016] Furthermore, there are multiple diversion rings, which are arranged along the axial direction of the exhaust gas treatment section.

[0017] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0018] A) The test bench ejector tube with exhaust gas treatment function provided by the present invention integrates the exhaust gas treatment function into the ejector tube. While treating the exhaust gas, the exhaust gas treatment section can also optimize the flow pattern of the exhaust gas, diffuse the airflow, and reduce the impact of the airflow on the side wall of the exhaust tower. It does not require a lot of modification to the ejector tube, thus avoiding the problems of increasing the overall length of the ejector tube and the exhaust gas flow resistance, and it will not change the original gas flow field of the ejector tube.

[0019] B) The test bench ejector with exhaust gas treatment function provided by this invention, by setting up an exhaust gas treatment section, utilizes a honeycomb catalyst module to treat nitrogen oxides (NOx) in the exhaust gas. x It can catalytically treat pollutants such as hydrocarbons (HC) and carbon monoxide (CO), thereby effectively reducing the pollution of the environment caused by exhaust emissions.

[0020] C) The test stand ejector tube with exhaust gas treatment function provided by the present invention can be used for newly constructed test stands or for the renovation of existing test stands, replacing the original perforated diffuser with the exhaust gas treatment section of this embodiment.

[0021] D) The test stand ejector tube with exhaust gas treatment function provided by the present invention, due to the setting of the guide cone, the exhaust gas will preferentially flow out from the honeycomb catalyst module in the third treatment zone. As the exhaust gas flows, the flow rate of the exhaust gas will gradually decrease. By appropriately increasing the porosity of the honeycomb catalyst module (i.e. the second treatment zone and the first treatment zone), it is possible to facilitate the exhaust gas to flow out from the second treatment zone and the first treatment zone, thereby ensuring that the exhaust gas can be fully catalyzed in each treatment zone. This partition design can not only improve the efficiency of exhaust gas treatment, but also make the utilization of the catalyst more reasonable and avoid the difference in treatment effect caused by uneven exhaust gas flow rate.

[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 may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

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

[0024] Figure 1 This is a schematic diagram of the structure of the test stand ejector tube with exhaust gas treatment function provided in Embodiment 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the treatment housing in the ejector tube of the test stand with exhaust gas treatment function provided in Embodiment 1 of the present invention;

[0026] Figure 3 This is a schematic diagram showing the connection of the treatment shell, honeycomb catalyst module and transition connection section in the ejector tube of the test stand with exhaust gas treatment function provided in Embodiment 1 of the present invention.

[0027] Figure 4 This is a schematic diagram showing the positions of the treatment shell, the first guide ring, and the second guide ring in the ejector tube of the test stand with exhaust gas treatment function provided in Embodiment 2 of the present invention.

[0028] Figure 5 This is a schematic diagram of the shell module in the ejector tube of the test stand with exhaust gas treatment function provided in Embodiment 3 of the present invention.

[0029] Figure label:

[0030] 1-Front ejector section; 2-Processing housing; 3-Honeycomb catalyst module; 4-Transition connection section; 5-Guide cone; 6-First processing zone; 7-Second processing zone; 8-Third processing zone; 9-First guide ring; 91-Front end concave annular surface; 92-Rear end concave annular surface; 10-Second guide ring; 11-Connecting main rod; 12-Connecting support rod; 13-Mounting top plate; 14-Mounting side plate; 15-Mounting bottom plate; 16-Support plate; 17-Slide rail; 18-Exhaust tower. 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 the present invention 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] Example 1

[0033] This embodiment provides a test stand ejector with exhaust gas treatment function; see [link / reference]. Figure 1 It includes a front ejector section 1 and an exhaust gas treatment section. The exhaust gas treatment section includes a treatment housing 2 and a honeycomb catalyst module 3 coaxially connected along the exhaust gas flow direction. The side wall of the treatment housing 2 has a catalyst receiving hole. The honeycomb catalyst module 3 is installed in the catalyst receiving hole. The treatment housing with the honeycomb catalyst module 3 is located in the exhaust tower 18.

[0034] Compared with the prior art, the test bench ejector tube with exhaust gas treatment function provided in this embodiment integrates the exhaust gas treatment function into the ejector tube. While treating the exhaust gas, the exhaust gas treatment section can also optimize the flow pattern of the exhaust gas, diffuse the airflow, and reduce the impact of the airflow on the side wall of the exhaust tower 18. It does not require a lot of modification to the ejector tube, thus avoiding the problems of increasing the overall length of the ejector tube and the exhaust gas flow resistance, and it will not change the original gas flow field of the ejector tube.

[0035] On the other hand, by setting up an exhaust gas treatment section, the honeycomb catalyst module 3 is used to treat nitrogen oxides (NOx) in the exhaust gas. x It can catalytically treat pollutants such as hydrocarbons (HC) and carbon monoxide (CO), thereby effectively reducing the pollution of the environment caused by exhaust emissions.

[0036] It should be noted that the above-mentioned test stand ejector tube with exhaust gas treatment function can be used for newly constructed test stands or for the renovation of existing test stands, replacing the original perforated diffuser with the exhaust gas treatment section of this embodiment.

[0037] For example, the processing housing 2 is a polygonal cylinder (e.g., a hexagonal cylinder), see [link to documentation]. Figure 2Multiple catalyst receiving holes are opened on each face of the polygonal cylinder, which can greatly increase the installation area of ​​the honeycomb catalyst module 3 and thus improve the exhaust gas treatment efficiency. The polygonal cylinder design not only optimizes the space utilization, but also allows the exhaust gas to come into more full contact with the honeycomb catalyst module 3 when it flows through the treatment section, ensuring the complete catalytic reaction.

[0038] Considering that the exhaust end of the front ejector section 1 is circular, in order to connect the front ejector section 1 with the exhaust gas treatment section, the aforementioned test bench ejector tube with exhaust gas treatment function also includes a transition connection section 4 between the front ejector section 1 and the treatment housing 2. See [link to relevant documentation]. Figure 3 The air inlet of the transition section 4 is circular, and the air outlet of the transition section 4 is polygonal. In this way, the air inlet of the transition section 4 matches the shape of the air outlet of the front ejector section 1, and the air outlet matches the shape of the treatment housing 2. This allows for a smooth transition connection between the front ejector section 1 and the exhaust gas treatment section, ensuring that the exhaust gas can flow smoothly from the front ejector section 1 into the exhaust gas treatment section for treatment.

[0039] In order to ensure that the exhaust gas can flow out of the exhaust gas treatment section from all sides and make full contact with the honeycomb catalyst module 3, a polygonal guide cone 5 is provided at the end of the exhaust gas treatment section. The tip of the guide cone 5 faces the air inlet of the exhaust gas treatment section. In this way, when the exhaust gas enters the exhaust gas treatment section at a high flow rate, it will first contact the guide cone 5. Under the action of the guide cone 5, the exhaust gas will disperse and flow in all directions, so that it can flow evenly through the honeycomb catalyst module 3 around it, ensuring that the catalyst can play a full role and improving the uniformity and efficiency of exhaust gas treatment.

[0040] For example, the exhaust gas treatment section includes multiple treatment zones connected sequentially along the exhaust gas flow direction. For example, the number of treatment zones is three, that is, the exhaust gas treatment section includes a first treatment zone 6, a second treatment zone 7 and a third treatment zone 8 connected sequentially along the exhaust gas flow direction. Along the direction gradually away from the air inlet end of the exhaust gas treatment section, the opening ratio of the honeycomb catalyst module 3 in the first treatment zone 6 is greater than that in the second treatment zone 7 and the third treatment zone 8.

[0041] This is because, due to the setting of the guide cone 5, the exhaust gas will preferentially flow out from the honeycomb catalyst module 3 in the third treatment zone 8. As the exhaust gas flows, the flow rate of the exhaust gas will gradually decrease. By appropriately increasing the porosity of the honeycomb catalyst module 3 (i.e., the second treatment zone 7 and the first treatment zone 6), it is possible to facilitate the exhaust gas to flow out from the second treatment zone 7 and the first treatment zone 6, thereby ensuring that the exhaust gas can be fully catalyzed in each treatment zone. This partitioned design can not only improve the efficiency of exhaust gas treatment, but also make the utilization of the catalyst more reasonable, avoiding the difference in treatment effect caused by uneven exhaust gas flow rate.

[0042] Example 2

[0043] This embodiment provides a test stand ejector with exhaust gas treatment function, the structure of which is basically the same as that of the test stand ejector with exhaust gas treatment function provided in Embodiment 1, the difference being:

[0044] See Figure 4 The test stand ejector tube with exhaust gas treatment function in this embodiment also includes a guide ring disposed in the exhaust gas treatment section. There are multiple guide rings, which are arranged along the axial direction of the exhaust gas treatment section. Along the direction that gradually moves away from the air inlet end of the exhaust gas treatment section, the inner diameter and outer diameter of the guide ring gradually decrease, and there is a gap between the guide ring and the inner wall of the exhaust gas treatment section.

[0045] Specifically, the design of the guide rings can further optimize the flow state of exhaust gas in the exhaust gas treatment section. When the exhaust gas enters the exhaust gas treatment section from the inlet, it will flow through multiple guide rings in sequence. Since the inner and outer diameters of the guide rings gradually decrease, this gradual design allows the exhaust gas to gradually change its flow velocity and direction during the flow process, making it more evenly distributed throughout the entire exhaust gas treatment section. At the same time, the gap between the guide rings and the inner wall of the exhaust gas treatment section can prevent the guide rings from causing excessive obstruction to the flow of exhaust gas, ensuring that the exhaust gas can pass through smoothly. Through the synergistic effect of multiple guide rings, the exhaust gas can be treated more fully and evenly in the exhaust gas treatment section, thereby improving the exhaust gas treatment performance of the entire test stand ejector.

[0046] For example, there are two drainage rings, namely a first drainage ring 9 and a second drainage ring 10. The first drainage ring 9 is located in the first processing area 6, and the second drainage ring 10 is located in the second processing area 7. The inner diameter of the second drainage ring 10 is smaller than the inner diameter of the first drainage ring 9, and the outer diameter of the second drainage ring 10 is smaller than the outer diameter of the first drainage ring 9.

[0047] Specifically, the structure of the drainage ring includes a front concave annular surface 91 and a rear concave annular surface 92, which are symmetrically arranged and fixedly connected. In practical applications, the two can be integrally molded.

[0048] Based on the structure of the guide ring, the flow process of the exhaust gas is as follows:

[0049] When the exhaust gas enters the exhaust gas treatment section, the first part of the exhaust gas comes into contact with the first guide ring 9. Under the guidance of the concave annular surface 91 at the front end of the first guide ring 9, the first part of the exhaust gas will diffuse to the surroundings and flow through the first treatment zone 6, and come into contact with the catalyst in the first treatment zone 6.

[0050] The remaining exhaust gas continues to flow forward. Since the inner and outer diameters of the second guide ring 10 are smaller than those of the first guide ring 9, the second part of the exhaust gas contacts the concave annular surface 91 at the front end of the second guide ring 10. Guided by the concave annular surface 91 at the front end of the second guide ring 10, the second part of the exhaust gas diffuses and flows through the second treatment zone 7, and contacts the catalyst in the second treatment zone 7.

[0051] The remaining exhaust gas continues to flow forward and comes into contact with the guide cone 5. Under the guidance of the guide cone 5, the exhaust gas diffuses in all directions. The third part of the exhaust gas flows through the third treatment zone 8 and comes into contact with the catalyst in the third treatment zone 8. The remaining part of the exhaust gas flows in the opposite direction.

[0052] When the fourth part of the exhaust gas flows through the second treatment zone 7, it comes into contact with the catalyst in the second treatment zone 7. When the fifth part of the exhaust gas flows through the first treatment zone 6, it comes into contact with the catalyst in the first treatment zone 6.

[0053] It should be noted that during the exhaust gas flow process described above, the division of each part of the exhaust gas is not absolutely fixed, but rather presents a relative and dynamic distribution state based on the structural characteristics of the guide ring and the guide cone 5.

[0054] In actual flow, the exhaust gas, under the combined action of the concave annular surface 91 at the front end of the guide ring and the guide cone 5, forms multiple dispersed airflows. These airflows flow through different treatment zones, making full contact with the honeycomb catalyst modules 3 in each zone, thereby achieving efficient exhaust gas catalytic treatment. This design not only increases the contact area between the exhaust gas and the catalyst but also makes the residence time of the exhaust gas in the treatment section more uniform by dispersing the airflow, further improving the effect and efficiency of exhaust gas treatment. At the same time, the gap design between the guide ring and the inner wall of the exhaust gas treatment section also ensures the smoothness of the exhaust gas flow process, avoiding the problem of reduced treatment efficiency due to airflow obstruction.

[0055] In order to realize the flow guide ring, the test stand ejector tube with exhaust gas treatment function also includes a connecting main rod 11 and a connecting support rod 12. One end of the connecting main rod 11 is fixedly connected to the tip of the guide cone 5, and the other end of the connecting main rod 11 is suspended. One end of the connecting support rod 12 is fixedly connected to the connecting main rod 11, and the other end of the connecting support rod 12 is fixedly connected to the flow guide ring.

[0056] For example, there are multiple connecting rods 12, and the multiple connecting rods 12 are evenly distributed in a radial direction along the connecting main rod 11.

[0057] In this way, the connecting main rod 11 and multiple connecting support rods 12 together form a stable support structure, which can ensure that the drainage ring maintains a fixed position and posture within the exhaust gas treatment section. In practical applications, the connecting main rod 11 and connecting support rods 12 can be made of high-temperature and corrosion-resistant materials to adapt to the high-temperature and corrosive environment that may occur during the exhaust gas treatment process.

[0058] Example 3

[0059] This embodiment provides a test stand ejector with exhaust gas treatment function, the structure of which is basically the same as that of the test stand ejector with exhaust gas treatment function provided in Embodiment 1, the difference being:

[0060] Considering that the exhaust gas treatment section may become clogged after long-term exhaust gas treatment, in order to facilitate the overall cleaning and replacement of the exhaust gas treatment section, the aforementioned treatment housing 2 includes multiple housing modules. The number of housing modules is equal to the number of sides of the polygon of the treatment housing 2. The multiple housing modules form a polygonal treatment housing 2. One end of the housing module is detachably and rotatably connected to the transition connection section 4, and the other end of the housing module is detachably and rotatably connected to the exhaust tower 18. In this way, when it is necessary to clean or replace the exhaust gas treatment section, each housing module can be easily disassembled one by one for individual treatment or replacement, without the need for large-scale disassembly of the entire ejector tube, thereby greatly improving the convenience and efficiency of maintenance.

[0061] To further facilitate the overall cleaning and replacement of the exhaust gas treatment section, please refer to... Figure 5 The aforementioned housing module includes a top mounting plate 13, a side mounting plate 14, a bottom mounting plate 15, a support plate 16, a slide rail 17, and a slide groove. The top mounting plate 13, the bottom mounting plate 15, and the two side mounting plates 14 are fixedly connected to form a main frame with openings at both ends. The support plate 16 is located in the main frame and is slidably connected to the bottom mounting plate 15 through the mutually cooperating slide rail 17 and slide groove. The honeycomb catalyst module 3 is placed on the support plate 16 and is detachably connected to the support plate 16.

[0062] In this way, when it is necessary to clean or replace the honeycomb catalyst module 3 inside a housing module, it is not necessary to disassemble the housing module from the overall structure. Instead, the support plate 16 can be pulled out from the main frame simply by the cooperation of the slide rail 17 and the slide groove, thus making it easy to remove or replace the honeycomb catalyst module 3 on the support plate 16. This design not only simplifies the maintenance process but also reduces maintenance costs and improves the overall service life of the test stand ejector. At the same time, the detachable and rotatable connection of the housing modules also allows for more flexible adjustment of the position and angle of each module during installation, ensuring the overall performance and stability of the exhaust gas treatment section.

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

Claims

1. A test stand ejector with exhaust gas treatment function, characterized in that, Includes the front ejector section and the exhaust gas treatment section; The exhaust gas treatment section includes a treatment housing and a honeycomb catalyst module coaxially connected along the exhaust gas flow direction. The side wall of the treatment housing has a catalyst receiving hole, and the honeycomb catalyst module is installed in the catalyst receiving hole. The treatment housing with the honeycomb catalyst module is located in the exhaust tower.

2. The test stand ejector with exhaust gas treatment function according to claim 1, characterized in that, The processing housing is a polygonal cylinder, with multiple catalyst receiving holes opened on each face of the polygonal cylinder.

3. The test stand ejector with exhaust gas treatment function according to claim 1, characterized in that, The test stand ejector tube also includes a transition connection section located between the front ejector section and the processing housing.

4. The test stand ejector with exhaust gas treatment function according to claim 3, characterized in that, The air inlet of the transition section is circular, and the air outlet of the transition section is polygonal.

5. The test stand ejector with exhaust gas treatment function according to claim 1, characterized in that, The exhaust gas treatment section has a polygonal guide cone at its end, with the tip of the guide cone facing the air inlet of the exhaust gas treatment section.

6. The test stand ejector with exhaust gas treatment function according to any one of claims 1 to 5, characterized in that, The exhaust gas treatment section includes multiple treatment zones connected sequentially along the exhaust gas flow direction.

7. The test stand ejector with exhaust gas treatment function according to claim 6, characterized in that, The number of treatment zones is three, and the exhaust gas treatment section includes a first treatment zone, a second treatment zone, and a third treatment zone connected sequentially along the exhaust gas flow direction.

8. The test stand ejector with exhaust gas treatment function according to claim 7, characterized in that, Along the direction of the intake end that gradually moves away from the exhaust gas treatment section, the opening ratio of the honeycomb catalyst module in the first treatment zone is greater than that in the second treatment zone, which is greater than that in the third treatment zone.

9. The test stand ejector with exhaust gas treatment function according to claim 1, characterized in that, The test stand ejector tube also includes a flow guide ring located in the exhaust gas treatment section.

10. The test stand ejector with exhaust gas treatment function according to claim 9, characterized in that, The number of the diversion rings is multiple, and the multiple diversion rings are arranged along the axial direction of the exhaust gas treatment section.

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