Automatic adsorption and desorption test bed tail gas treatment device
By designing an automatic adsorption and desorption test bench exhaust treatment device, and using zeolite molecular sieve and circulation heating technology, the problems of high cost and frequent material replacement in the exhaust treatment of aircraft engine test bench are solved, achieving the effect of efficiently reducing exhaust pollution and odor.
Patent Information
- Application Number
- CN202420401874.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-01
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-03-01
AI Technical Summary
The exhaust gas of the aircraft engine test bench has odor and black smoke, and the conventional exhaust gas treatment method is expensive and the material is frequently replaced.
A test drive table exhaust gas treatment device is designed for automatic adsorption and desorption, including exhaust gas adsorption device, circulation heating device and desorption and regeneration device, and adsorption and desorption are used to use zeolite molecular sieve, and purification is carried out in combination with cyclic heating and three-way catalyst.
It effectively reduces the concentration of pollutants in the exhaust gas emitted by the test drive platform, reduces the exhaust odor and black smoke, reduces the number of material replacements and operation difficulty, and improves the efficiency and cost-effectiveness of exhaust gas treatment.
Smart Images
Figure CN222804948U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of tail gas treatment of aviation engine test benches, and relates to an automatic adsorption and desorption test bench tail gas treatment device. Background Art
[0002] The main components of exhaust gas emitted by aircraft engine test benches are nitrogen oxides (NOx), sulfides (SOx), carbon monoxide (CO), volatile organic compounds (VOCs), particulate matter (PM), etc. During aircraft engine test runs, the exhaust pollutants emitted are at a low concentration and the exhaust flow is large, which will produce a large amount of black smoke and unpleasant odor in a short period of time. VOCs in the exhaust gas are the main source of exhaust odor, and particulate matter is the main source of exhaust black smoke.
[0003] The working conditions of aircraft engines are complex, and the exhaust volume and temperature of each test condition are different. Conventional exhaust gas treatment methods such as spray towers, adsorption boxes, dust collectors, etc. have limited exhaust gas use conditions and a single treatment material. The exhaust gas treatment equipment has high back pressure and high cost, and cannot be directly applied to the exhaust gas treatment of aircraft engine test benches. The following factors need to be considered for the exhaust gas treatment of aircraft engine test benches: (1) The exhaust gas flow rate of the test bench is large and the pollutant concentration is low; (2) Conventional exhaust gas treatment methods are costly; (3) The replacement of exhaust gas treatment materials is frequent. Taking all the above factors into consideration, a set of exhaust gas treatment devices that are easy to use and simple in structure are needed to treat the odor and black smoke of the exhaust gas of the test bench. Utility Model Content
[0004] The purpose of the utility model is to provide an automatic adsorption and desorption test bench exhaust gas treatment device to solve the problems in the prior art of odor and black smoke in the exhaust gas of aircraft engine test benches, high cost of conventional exhaust gas treatment methods and frequent replacement of exhaust gas treatment materials. The utility model can treat the exhaust gas emitted by the aircraft engine test bench, and the exhaust gas pollutants are adsorbed after the adsorption mode of the exhaust gas treatment device is turned on. After the adsorption mode is turned off, the desorption mode is turned on, and cyclic heating and desorption regeneration are automatically performed. The utility model can be applied to the exhaust gas treatment of modified and newly built aircraft engine test benches.
[0005] In view of the above objectives, the present invention adopts the following technical solutions to achieve the above objectives.
[0006] A test bench exhaust gas treatment device with automatic adsorption and desorption, wherein the test bench exhaust gas treatment device is arranged at the exhaust tower of an aircraft engine test bench, and the test bench exhaust gas treatment device comprises an exhaust gas adsorption device 3, a circulation heating device 4, and a desorption and regeneration device 5. The circulation heating device 4 is arranged on one side of the exhaust gas adsorption device 3 and is connected to the exhaust gas adsorption device 3, and the desorption and regeneration device 5 is arranged on the other side of the exhaust gas adsorption device 3 and is connected to the exhaust gas adsorption device 3.
[0007] Furthermore, the exhaust gas adsorption device includes an adsorption fan 31, a high-temperature air valve 32, a zeolite molecular sieve 33, a box-type support structure 34, and a pressure sensor 35. The box-type support structure 34 is a closed structure. High-temperature air valves 32 are provided on both the upper and lower sides of the box-type support structure 34. The adsorption fan 31 is arranged on the top of the box-type support structure 34 and is connected to the box-type support structure 34 through the high-temperature air valve 32 on the upper side. The zeolite molecular sieve 33 is arranged in the middle of the box-type support structure 34, and the pressure sensor 35 is arranged on the inner wall of the box-type support structure 34.
[0008] Furthermore, there are two pressure sensors 35 , which are arranged on the inner wall surface of the box-shaped support structure 34 , and the two pressure sensors 35 are located above and below the zeolite molecular sieve 33 .
[0009] Furthermore, the circulation heating device 4 includes a circulation duct air valve 41, a circulation duct 42, a circulation heater 43, a circulation fan 44, and an air supply air valve 45. The inlet and outlet ends of the circulation duct 42 are both connected to the box-type support structure 34. The circulation duct air valve 41 is arranged at the inlet end, and the circulation heater 43, the circulation fan 44 and the air supply duct interface are arranged in the middle of the circulation duct 42. The circulation fan 44 is located behind the circulation heater 43, and the air supply duct interface is located in front of the circulation heater 43. The air supply air valve 45 is arranged on the air supply duct interface.
[0010] Furthermore, the zeolite molecular sieve 33 divides the box-type support structure 34 into an upper chamber and a lower chamber, the inlet end of the circulation pipe 42 is connected to the lower chamber of the box-type support structure 34, and the outlet end of the circulation pipe 42 is connected to the upper chamber of the box-type support structure 34.
[0011] Furthermore, the desorption regeneration device 5 includes a desorption duct air valve 51, a desorption duct 52, a desorption box 53, a three-way catalyst 54, and a desorption fan 55. The inlet end of the desorption duct 52 is connected to the lower chamber of the box-type support structure 34, and the other end is connected to the desorption box 53. The duct air valve 51 is arranged on the desorption duct 52, the three-way catalyst 54 is arranged in the desorption box 53, and the desorption fan 55 is arranged at the outlet of the desorption box 53.
[0012] Beneficial effects of the utility model:
[0013] The utility model proposes an automatic adsorption and desorption test bench exhaust gas treatment device. Under the premise of ensuring the normal test of the aircraft engine, the exhaust gas treatment method of pollutant adsorption is used to reduce the pollutant concentration in the exhaust gas discharged from the aircraft engine test bench, reduce the exhaust odor and black smoke, and the exhaust gas treatment device automatically desorbs the adsorption material, reducing the workload of personnel operating to replace materials. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a cross-sectional view of the exhaust section of an aircraft engine test bench;
[0015] Figure 2 This is a cross-sectional view of the exhaust gas section after the automatic adsorption and desorption exhaust gas treatment device is installed;
[0016] Figure 3 It is an enlarged schematic diagram of the exhaust section after the automatic adsorption and desorption exhaust gas treatment device is installed;
[0017] Figure 4 This is a top view of the exhaust gas part after the automatic adsorption and desorption exhaust gas treatment device is installed;
[0018] Figure 5 is a cross-sectional view of an adsorption mode tail gas treatment device;
[0019] Figure 6 It is a cross-sectional view of the tail gas treatment device in the cycle heating process;
[0020] Figure 7 It is a cross-sectional view of the exhaust gas treatment device during the desorption regeneration process.
[0021] Among them, 1. ejector tube, 2. exhaust tower, 3. exhaust gas adsorption device, 4. circulation heating device, 5. desorption regeneration device, 31. adsorption fan, 32. high temperature air valve, 33. zeolite molecular sieve, 34. box-type support structure, 35. pressure sensor, 41. circulation pipe air valve, 42. circulation pipe, 43. circulation heater, 44. circulation fan, 45. air supply air valve, 51. desorption pipe air valve, 52. desorption pipe, 53. desorption box, 54. three-way catalyst, 55. desorption fan. DETAILED DESCRIPTION
[0022] The utility model is further introduced below in conjunction with the accompanying drawings:
[0023] Aircraft engine test bench exhaust structure Figure 1 As shown, the exhaust gas of the aircraft engine directly enters the ejector tube 1, enters the exhaust tower 2 along the exhaust structure at the tail of the ejector tube 1, and is directly discharged into the atmosphere from the outlet of the exhaust tower.
[0024] like Figure 2 As shown, the utility model proposes an automatic adsorption and desorption test bench exhaust gas treatment device, the test bench exhaust gas treatment device is arranged at the exhaust tower of the aircraft engine test bench, the test bench exhaust gas treatment device includes an exhaust gas adsorption device 3, a circulation heating device 4, and a desorption and regeneration device 5, the circulation heating device 4 is arranged on one side of the exhaust gas adsorption device 3, and is connected to the exhaust gas adsorption device 3, the desorption and regeneration device 5 is arranged on the other side of the exhaust gas adsorption device 3, and is connected to the exhaust gas adsorption device 3.
[0025] like Figure 3 , Figure 4As shown, the exhaust gas adsorption device includes an adsorption fan 31, a high-temperature air valve 32, a zeolite molecular sieve 33, a box-type support structure 34, and a pressure sensor 35. The box-type support structure 34 is a closed structure. High-temperature air valves 32 are arranged on the upper and lower sides of the box-type support structure 34. The adsorption fan 31 is arranged on the top of the box-type support structure 34 and is connected to the box-type support structure 34 through the high-temperature air valve 32 on the upper side. The zeolite molecular sieve 33 is arranged in the middle of the box-type support structure 34, and the pressure sensor 35 is arranged on the inner wall surface of the box-type support structure 34; there are two pressure sensors 35, which are arranged on the inner wall surface of the box-type support structure 34, and the two pressure sensors 35 are located above and below the zeolite molecular sieve 33.
[0026] like Figure 3 , 4 As shown, the circulation heating device 4 includes a circulation duct air valve 41, a circulation duct 42, a circulation heater 43, a circulation fan 44, and an air supply air valve 45. The inlet and outlet ends of the circulation duct 42 are both connected to the box-type support structure 34. The circulation duct air valve 41 is arranged at the inlet end, and the circulation heater 43, the circulation fan 44 and the air supply duct interface are arranged in the middle of the circulation duct 42. The circulation fan 44 is located behind the circulation heater 43, and the air supply duct interface is located in front of the circulation heater 43. The air supply air valve 45 is arranged on the air supply duct interface.
[0027] like Figure 3 As shown, the zeolite molecular sieve 33 divides the box-type support structure 34 into an upper chamber and a lower chamber, the inlet end of the circulation pipe 42 is connected to the lower chamber of the box-type support structure 34, and the outlet end of the circulation pipe 42 is connected to the upper chamber of the box-type support structure 34.
[0028] like Figure 3 As shown, the desorption regeneration device 5 includes a desorption pipeline air valve 51, a desorption pipeline 52, a desorption box 53, a three-way catalyst 54, and a desorption fan 55. The inlet end of the desorption pipeline 52 is connected to the lower chamber of the box-type support structure 34, and the other end is connected to the desorption box 53. The pipeline air valve 51 is arranged on the desorption pipeline 52, the three-way catalyst 54 is arranged in the desorption box 53, and the desorption fan 55 is arranged at the outlet of the desorption box 53.
[0029] The exhaust gas treatment device of the test bench with automatic adsorption and desorption includes two working modes, one is adsorption mode and the other is desorption mode. When the aircraft engine is tested, the exhaust gas is discharged upward from the exhaust tower, and the exhaust gas treatment device is in the adsorption state. Figure 5As shown, in the adsorption state, the adsorption fan 31 is turned on, the high-temperature air valve 32 is opened, the circulation pipeline air valve 41 of the circulation heating device 4 is closed, and the desorption pipeline air valve 51 of the desorption regeneration device 5 is closed. The exhaust gas discharged from the test bench passes through the zeolite molecular sieve 33 and is discharged upward into the atmosphere under the suction action of the adsorption fan 31. The zeolite molecular sieve 33 is a porous structure, which can adsorb volatile organic compounds, particulate matter and other small molecular pollutants in the exhaust gas at ≤60°C, thereby reducing the odor of the exhaust gas and reducing black smoke. The wind pressure of the adsorption fan 31 can overcome the aerodynamic resistance generated by the air flow passing through the zeolite molecular sieve 33 during the adsorption process, which helps the exhaust gas to be discharged from the exhaust tower smoothly, avoids accumulation in the exhaust tower, and affects the test run of the aircraft engine. The pressure sensor 35 is arranged above and below the zeolite molecular sieve 33. In the adsorption state, the system records the pressure difference of the pressure sensor 35 above and below the zeolite molecular sieve 33.
[0030] like Figure 6 As shown, after the aircraft engine test is completed, there is no exhaust gas discharged from the test bench, and the adsorption mode of the exhaust gas treatment device is turned off. The system determines that when the pressure difference of the pressure sensor 35 in the adsorption state is greater than or equal to the wind pressure of the adsorption fan 31, the zeolite molecular sieve 33 is saturated with adsorption, and the desorption mode is automatically turned on. In the desorption mode, the circulation heating and desorption regeneration process are carried out. After the circulation heating starts, the adsorption fan 31 and the high-temperature air valve 32 of the exhaust gas adsorption device 3 are closed, and the circulation pipeline air valve 41, the circulation heater 43, and the circulation fan 44 of the circulation heating device 4 are opened, and the air supply air valve 45 is closed. The box-type support structure 34 of the exhaust gas adsorption device 3 and the circulation heating device 4 form a closed space, and the circulation heater 43 and the circulation fan 44 circulate and heat the air in the closed space. The heating temperature is stabilized at 250°C and lasts for more than 30 minutes. As shown Figure 7 As shown, at a temperature higher than 200°C, the substances adsorbed by the zeolite molecular sieve 33 will be released, forming high-concentration exhaust gas in the closed space formed by the box-type support structure 34 and the circulating heating device 4. The duration of the circulating heating is adjusted according to the number of zeolite molecular sieves 33 arranged to ensure that the zeolite molecular sieves 33 are evenly heated.
[0031] like Figure 7As shown, after the zeolite molecular sieve 33 in the box-type support structure 34 is cyclically heated, the exhaust gas treatment device enters the desorption regeneration process. After the desorption regeneration process begins, the air supply valve 45 of the circulating heating device 4 is opened, and the desorption pipeline air valve 51 and the desorption fan 55 are opened. The high-concentration and high-temperature exhaust gas in the enclosed space of the box-type support structure 34 is induced by the desorption fan 55, and is purified and discharged into the air through the desorption pipeline 52, the desorption box 53, and the three-way catalyst 54. The temperature of the high-concentration exhaust gas is greater than 200°C, and the three-way catalyst 54 can cause the volatile organic matter and particulate matter in the high-temperature exhaust gas above 200°C to undergo oxidation reaction and convert them into harmless carbon dioxide and water, thereby achieving the purpose of exhaust gas purification. After the desorption regeneration state lasts for 30 minutes, the circulating heater 43, the circulating heating fan 44, and the air supply valve 45 are closed, and the desorption pipeline air valve 51 and the desorption fan 55 are closed.
[0032] The automatic adsorption and desorption test bench tail gas treatment device treats the tail gas discharged from the test bench through the adsorption mode, desorbs the adsorbed pollutants through the desorption mode, and then concentrates the exhaust gas through the three-way catalyst 54. The goal of efficiently treating the tail gas of the test bench is achieved, and the adsorption and desorption can ensure the multiple use of the zeolite molecular sieve 33, reducing the number of material replacements and the difficulty of operation.
[0033] It is easy for those skilled in the art to understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. An automatic adsorption and desorption test bench tail gas treatment device, characterized in that: The test bench exhaust gas treatment device is arranged at the exhaust tower port of the aircraft engine test bench. The test bench exhaust gas treatment device includes an exhaust gas adsorption device, a circulation heating device, and a desorption regeneration device. The circulation heating device is arranged on one side of the exhaust gas adsorption device and is connected to the exhaust gas adsorption device. The desorption regeneration device is arranged on the other side of the exhaust gas adsorption device and is connected to the exhaust gas adsorption device.
2. The automatic adsorption and desorption test bench tail gas treatment device according to claim 1 is characterized by: The exhaust gas adsorption device includes an adsorption fan, a high-temperature air valve, a zeolite molecular sieve, a box-type support structure, and a pressure sensor. The box-type support structure is a closed structure. High-temperature air valves are arranged on the upper and lower sides of the box-type support structure. The adsorption fan is arranged on the top of the box-type support structure and is connected to the box-type support structure through the high-temperature air valve on the upper side. The zeolite molecular sieve is arranged in the middle of the box-type support structure, and the pressure sensor is arranged on the inner wall of the box-type support structure.
3. The automatic adsorption and desorption test bench tail gas treatment device according to claim 2 is characterized by: There are two pressure sensors, which are arranged on the inner wall surface of the box-shaped supporting structure, and the two pressure sensors are located above and below the zeolite molecular sieve.
4. The automatic adsorption and desorption test bench tail gas treatment device according to claim 2 is characterized by: The circulation heating device includes a circulation duct air valve, a circulation duct, a circulation heater, a circulation fan, and an air supply air valve. The inlet and outlet ends of the circulation duct are both connected to the box-type supporting structure. The inlet end is provided with a circulation duct air valve. The middle part of the circulation duct is provided with a circulation heater, a circulation fan and an air supply duct interface. The circulation fan is located behind the circulation heater, the air supply duct interface is located in front of the circulation heater, and the air supply air valve is provided on the air supply duct interface.
5. The automatic adsorption and desorption test bench tail gas treatment device according to claim 4 is characterized by: The zeolite molecular sieve divides the box-type support structure into an upper chamber and a lower chamber. The inlet end of the circulation pipeline is connected to the lower chamber of the box-type support structure, and the outlet end of the circulation pipeline is connected to the upper chamber of the box-type support structure.
6. The automatic adsorption and desorption test bench tail gas treatment device according to claim 5 is characterized by: The desorption regeneration device includes a desorption duct air valve, a desorption duct, a desorption box, a three-way catalyst, and a desorption fan. The inlet end of the desorption duct is connected to the lower chamber of the box-type support structure, and the other end is connected to the desorption box. A duct air valve is arranged on the desorption duct, the three-way catalyst is arranged in the desorption box, and a desorption fan is arranged at the outlet of the desorption box.