Collecting device and method for combustion products of fuel-rich gas generator of aero-engine

Abstract

The invention discloses a device and a method for collecting combustion products of an aero-engine fuel-rich gas generator, an asbestos fiber material, a zeolite molecular sieve, sandy soil and a filter screen are adopted for multiple filtration, and solid-liquid components in outlet flue gas are filtered and collected; and under the action of the water-cooling coil pipe, the residual outlet flue gas is cooled to a safe temperature, and the low-pressure gas tank is utilized to complete the collection of gas components. The mass of solid-liquid components is obtained by weighing the mass change of the filtering device, the component distribution of gas-phase components is obtained through a gas chromatography detection method, and evaluation and analysis of the combustion condition of the fuel-rich generator are achieved. The material required by the collecting device is stable in performance, low in price and good in usability and service life, and remarkable working and economic benefits can be obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft engine combustion, and in particular relates to a device and method for collecting combustion products of an aircraft engine rich fuel gas generator. Background Art

[0002] With the development of aerospace technology, high-performance, high-reliability, and low-emission aviation engine technology has received widespread attention from all countries. On the basis of the current development of aviation power, how to further optimize aviation power technology is the next issue that needs to be explored and solved. As the combustion device at the core of the engine power output, the combustion stability of the thrust chamber and gas generator determines the vibration level and thrust adjustment capability of the entire engine under variable working conditions, and has a decisive impact on the feasibility of the deep variable thrust engine solution.

[0003] The gas generator can provide higher combustion pressure and longer working time for liquid rocket engines, which is crucial to the reliability and stability of the entire engine. The rich-fuel gas generator of an aircraft engine is mainly composed of injectors, cylindrical sections, spoiler rings, turbine blade simulation parts, nozzle sections, etc. When the rich-fuel gas generator works in a steady state, the turbine output power reaches the maximum value. When the power output is low, the gas generator works in a pulse mode under the control of the controller to ensure the constant turbine speed and power output requirements. As one of the combustion devices at the core of the engine power output, the combustion stability of the gas generator determines the vibration level and thrust adjustment capability of the entire engine under variable working conditions, which is crucial to the reliability and stability of the entire engine.

[0004] Since the collection of gas generator combustion products has the characteristics of high temperature, fast speed and short collection time, the existing gas generator combustion product collection technology often uses sampler collection or vacuum tank collection, which still has certain defects. For example, the sampler collects limited samples, making it difficult to make a reasonable analysis of the overall combustion conditions. In addition, the sampler collection element has a reduced service life and reduced reliability in harsh environments; vacuum tank collection needs to cover the entire fuel outlet, which is dangerous, and has high requirements for material strength and size, and poor economy and reusability. Therefore, a new gas generator combustion product collection device and method is urgently needed. Summary of the invention

[0005] Based on the above problems in the prior art, the purpose of the present invention is to provide a device and method for collecting the combustion products of the rich-fuel gas generator of an aircraft engine, using asbestos fiber materials, zeolite molecular sieves, sand and filter nets for multiple filtration to filter and collect the solid and liquid components in the outlet flue gas; under the action of the water-cooled coil, the remaining outlet flue gas is cooled to a safe temperature, and the gas components are collected using a low-pressure gas tank. The mass of the solid and liquid components is obtained by weighing the mass change of the filter device, and the component distribution of the gas phase components is obtained by the gas chromatography detection method, so as to realize the evaluation and analysis of the combustion condition of the rich-fuel generator.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A device for collecting combustion products of a rich-fuel gas generator of an aircraft engine, comprising an exhaust system and a collection system;

[0008] The vacuum system includes a vacuum pump 10, a three-way valve 6, an electric control valve 7, a pressure gauge 8 and a gas cylinder 9; the vacuum pump 10 is connected to the first inlet of the three-way valve 6; the outlet of the three-way valve 6 is connected to the inlet of the electric control valve 7; the outlet of the electric control valve 7 is connected to the inlet of the gas cylinder 9 through the pressure gauge 8;

[0009] The collection system includes a filtering system, a water cooling coil 5, a three-way valve 6, an electric control valve 7, a pressure gauge 8 and a gas cylinder 9 connected in sequence; at the outlet of the aircraft engine generator, a multiple filtering system is used to collect the high-temperature fuel gas; the filtering system includes an asbestos fiber material 1, a zeolite molecular sieve 2, sand 3 and a filter screen 4 arranged in sequence from the inlet to the outlet; when the fuel gas flows through the filtering system, the solid and liquid components are collected; the remaining fuel gas is cooled via the water cooling coil 5; the outlet of the water cooling coil 5 is connected to the second inlet of the three-way valve 6; the outlet of the three-way valve 6 is connected to the inlet of the electric control valve 7; the outlet of the electric control valve 7 is connected to the inlet of the gas cylinder 9 via the pressure gauge 8.

[0010] The zeolite molecular sieve 2 is made of silicate or aluminosilicate minerals containing alkali or alkaline earth metals, having interconnected pores and a frame-like structure. The basic structural unit of the zeolite molecular sieve is a tetrahedral framework structure formed by interconnected oxygen bridges; the zeolite molecular sieve has a pore size of 0.3 to 2 nm and a specific surface area of ​​up to 400 to 800 m 2 / g, and the pores of the molecular sieve are uniform and the pore size can be adjusted according to the synthesis conditions.

[0011] In the filtering system, the asbestos fiber material 1, the zeolite molecular sieve 2, the sand 3 and the filter screen 4 from the inlet to the outlet are arranged in a stainless steel pipe.

[0012] The collection and detection method of the combustion product collection device of the rich fuel gas generator of an aircraft engine has the following specific steps:

[0013] Step (1): Pumping stage

[0014] In the air extraction stage, the first inlet and outlet of the three-way valve 6 are opened, the second inlet of the three-way valve 6 is closed, and the vacuum pump 10, the electric control valve 7 and the gas cylinder 9 are connected; the vacuum pump 10 is turned on to start air extraction, and when the pressure gauge 8 reading is less than 10 kPa, the three-way valve 6, the vacuum pump 10 and the electric control valve 7 are closed, so that the gas cylinder 9 is under negative pressure;

[0015] Step (2): Collection phase

[0016] Weigh the mass of the filtration system before the collection phase begins. Connect the filtration system outlet to the cooling coil 5 inlet, connect the cooling coil 5 outlet to the second inlet of the three-way valve 6, and close the first inlet of the three-way valve 6; at the beginning of the collection, connect the starting end of the collection system to the exhaust end, check the tightness, and wait for the experimental ignition after there is no leakage. When the combustion products are observed to be ejected from the rear of the aircraft engine rich fuel gas generator, open the electric control valve 7 and the second inlet and outlet of the three-way valve 6 in turn, so that the gas passes through the solid and liquid components after filtration, is collected and cooled, and then enters the gas cylinder 9, and the collection phase is completed;

[0017] Step (3): Gas collection and detection analysis

[0018] Remove the filtration system, weigh the mass again, compare it with the mass before the collection stage, and calculate the mass of the solid and liquid components in the fuel gas; remove the pressure gauge 8 and the gas cylinder 9, let it stand for 2-3 days until the pressure gauge reading is stable, use a gas capture bag to collect a preset mass of fuel gas sample, dissolve it with anhydrous ethanol, perform gas chromatography analysis under the selected chromatographic conditions and determine the actual concentration of each component in the fuel gas from the concentration-time curve of the fuel gas sample. The gas chromatography analysis conditions are as follows: the chromatographic column uses an HP-5 weak polar capillary column; the carrier gas is hydrogen; the injector temperature is controlled at 260°C; the programmed heating method: the initial temperature is 40°C; the heating rate during the heating process from 40 to 120°C is 3°C / min; the heating rate during the heating process from 120 to 260°C is 10°C / min; 260°C: maintain for 5 minutes.

[0019] The collection device and detection method of the combustion products of the aircraft engine generator of the present invention only need to connect the relevant equipment at the outlet of the original engine gas generator for collection and detection. The material required for the collection device has stable performance, low price, good usability and service life, can achieve significant work and economic benefits, and can achieve the following beneficial effects:

[0020] (1) The filtering and collecting materials used in the present invention are low in cost and have stable physical and chemical properties, and have little effect on the collection and detection of fuel gas substances.

[0021] (2) The zeolite molecular sieve material used in the present invention has excellent specific surface area and pore structure performance, and the pores of the molecular sieve are very uniform and the pore size can be adjusted according to the synthesis conditions, so that it can show excellent selectivity and good adsorption performance. At the same time, the molecular sieve also has a large electrostatic attraction, and has a high affinity for molecules with strong polarity and large polarizability, so it has a strong adsorption efficiency.

[0022] (3) The stainless steel pipe used in the filtration system of the present invention can withstand a maximum temperature of 800°C, can cope with high-temperature heating and flushing of gas, and has good safety and stability.

[0023] (4) The gas chromatography detection and analysis technology adopted in the present invention has the advantages of fast analysis speed and high separation efficiency, and is a highly sensitive selective detection technology.

[0024] (5) The method for collecting and detecting combustion products of aircraft engine generators in the present invention can be extended to the detection and analysis of other generator gases, and only the corresponding filter and pipeline materials need to be changed, which has good applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the device of the present invention. DETAILED DESCRIPTION

[0026] like Figure 1 As shown, the present invention is a device and method for collecting combustion products of a rich-fuel gas generator of an aircraft engine. Asbestos fiber materials, zeolite molecular sieves, sand and filter nets are used for multiple filtration to filter and collect solid and liquid components in the outlet flue gas; under the action of a water-cooled coil, the remaining outlet flue gas is cooled to a safe temperature, and a low-pressure gas tank is used to complete the collection of gas components. The mass change of the filter device is weighed to obtain the mass of the solid and liquid components, and the component distribution of the gas phase components is obtained by a gas chromatography detection method, so as to realize the evaluation and analysis of the combustion condition of the rich-fuel generator.

[0027] like Figure 1As shown, a collection device for combustion products of a fuel-rich gas generator of an aircraft engine of the present invention comprises an exhaust system and a collection system; the exhaust system comprises a vacuum pump 10, a three-way valve 6, an electric control valve 7, a pressure gauge 8 and a gas cylinder 9; the vacuum pump 10 is connected to the first inlet of the three-way valve 6; the outlet of the three-way valve 6 is connected to the inlet of the electric control valve 7; the outlet of the electric control valve 7 is connected to the inlet of the gas cylinder 9 through the pressure gauge 8; the collection system comprises a filtering system, a water cooling coil 5, a three-way valve 6, an electric control valve 7, a pressure gauge 8 and a gas cylinder 9 connected in sequence; at the outlet of the aircraft engine generator, a multiple filtering system is used to collect high-temperature fuel gas; the filtering system comprises an asbestos fiber material 1, a zeolite molecular sieve 2, sand 3 and a filter screen 4 arranged in sequence from the inlet to the outlet; when the fuel gas flows through the filtering system, solid and liquid components are collected; the remaining fuel gas is cooled via the water cooling coil 5; the outlet of the water cooling coil 5 is connected to the second inlet of the three-way valve 6; the outlet of the three-way valve 6 is connected to the inlet of the electric control valve 7; the outlet of the electric control valve 7 is connected to the inlet of the gas cylinder 9 through the pressure gauge 8.

[0028] Preferably, the zeolite molecular sieve 2 is made of silicate or aluminosilicate minerals containing alkali or alkaline earth metals, having interconnected pores and a framework structure. The basic structural unit of the zeolite molecular sieve is a tetrahedral framework structure formed by interconnected oxygen bridges; the zeolite molecular sieve has a pore size of 0.3 to 2 nm and a specific surface area of ​​up to 400 to 800 m 2 / g, and the pores of the molecular sieve are uniform and the pore size is regulated according to the synthesis conditions. Thus, it can show excellent selectivity and good adsorption performance. At the same time, the molecular sieve also has a large electrostatic attraction, and has a high affinity for molecules with strong polarity and large polarizability, thus having a strong adsorption efficiency.

[0029] Preferably, the asbestos fiber material 1, zeolite molecular sieve 2, sand 3 and filter screen 4 from the inlet to the outlet of the filtration system are arranged in a stainless steel pipe, which can cope with high-temperature heating and flushing of gas and has good safety and stability.

[0030] The present invention provides a collection and detection method of a collection device for combustion products of a fuel-rich gas generator of an aircraft engine, which is specifically as follows:

[0031] (1) Pumping stage

[0032] In the vacuuming stage, at 25°C and 101 kPa, open the first inlet and outlet of the three-way valve 6, close the second inlet of the three-way valve 6, and connect the vacuum pump 10, the electric control valve 7 and the 20L standard gas cylinder 9. Turn on the vacuum pump 10 to start vacuuming. When the pressure gauge reading is less than 10 kPa, close the three-way valve 6, the vacuum pump 10 and the electric control valve 7 to prepare a negative pressure gas cylinder;

[0033] (2) Collection phase

[0034] Arrange 100g of asbestos fiber material, 100g of zeolite molecular sieve, 200g of sand and 400-mesh filter in a 20mm diameter stainless steel pipe, and weigh the overall mass of the filtration system. Connect the outlet of the filtration system to the inlet of the cooling coil 5, connect the outlet of the cooling coil 5 to the second inlet of the three-way valve 6, close the first inlet of the three-way valve 6, connect the starting end of the collection system to the end of the heat exchanger at the beginning of collection, check the tightness, and wait for the experimental ignition after there is no leakage. When the combustion products are observed to be ejected from the rear of the aircraft engine rich fuel gas generator, open the electric control valve 7 and the second inlet and outlet of the three-way valve 6 in turn, so that the gas enters the gas cylinder 9 after the solid and liquid components are filtered and collected and cooled, and the collection stage is completed.

[0035] (3) Gas collection, detection and analysis

[0036] Remove the filter system, weigh the mass again, compare it with the mass before the collection phase, and calculate the mass of the solid and liquid components in the gas; remove the pressure gauge 8 and gas cylinder 9, let it stand for 2-3 days until the pressure gauge reading is stable, use a gas capture bag to collect a preset mass of gas sample, dissolve it with anhydrous ethanol, perform gas chromatography analysis under the selected chromatographic conditions, and determine the actual concentration of each component in the gas from the concentration-time curve of the gas sample. The gas chromatography analysis conditions are: the chromatographic column uses an HP-5 weak polar capillary column; the carrier gas is hydrogen; the injector temperature is controlled at 260°C. Program heating method: initial temperature is 40°C; the heating rate during the heating process from 40 to 120°C is 3°C / min; the heating rate during the heating process from 120 to 260°C is 10°C / min; 260°C: keep for 5 minutes. Calculate the composition distribution of gas phase components.

[0037] The present invention is a collection device and detection method of combustion products using multiple filtration and cooling, which can realize the separation, cooling and detection of combustion products of a fuel-rich gas generator and clarify the combustion condition and product distribution of the generator.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for collecting combustion products of a rich-fuel gas generator of an aircraft engine, characterized in that: The device comprises an air extraction system and a collection system; The air extraction system comprises a vacuum pump (10), a three-way valve (6), an electric control valve (7), a pressure gauge (8) and a gas cylinder (9); the vacuum pump (10) is connected to a first inlet of the three-way valve (6); the outlet of the three-way valve (6) is connected to an inlet of the electric control valve (7); the outlet of the electric control valve (7) is connected to an inlet of the gas cylinder (9) via the pressure gauge (8); The collection system comprises a filter system, a water cooling coil (5), a three-way valve (6), an electric control valve (7), a pressure gauge (8) and a gas cylinder (9) which are connected in sequence; at the outlet of the aircraft engine generator, a multiple filter system is used to collect high-temperature fuel gas; the filter system comprises an asbestos fiber material (1), a zeolite molecular sieve (2), sand (3) and a filter screen (4) which are arranged in sequence from the inlet to the outlet; when the fuel gas flows through the filter system, solid and liquid components are collected; the remaining fuel gas is cooled via the water cooling coil (5); the outlet of the water cooling coil (5) is connected to the second inlet of the three-way valve (6); the outlet of the three-way valve (6) is connected to the inlet of the electric control valve (7); the outlet of the electric control valve (7) is connected to the inlet of the gas cylinder (9) via the pressure gauge (8).

2. The device for collecting combustion products of a rich fuel gas generator of an aircraft engine according to claim 1, characterized in that: The zeolite molecular sieve (2) is made of silicate or aluminosilicate minerals containing alkali or alkaline earth metals, having interconnected pores and a frame-like structure. The basic structural unit of the zeolite molecular sieve is a tetrahedral framework structure formed by interconnected oxygen bridges. The zeolite molecular sieve has a pore size of 0.3 to 2 nm and a specific surface area of ​​up to 400 to 800 m 2 / g, and the pores of the molecular sieve are uniform and the pore size can be adjusted according to the synthesis conditions.

3. The device for collecting combustion products of a rich fuel gas generator of an aircraft engine as claimed in claim 1, characterized in that: In the filtering system, the asbestos fiber material (1), the zeolite molecular sieve (2), the sand (3) and the filter screen (4) are arranged in a stainless steel pipe from the inlet to the outlet.

4. The collection and detection method of the collection device of the combustion products of the rich fuel gas generator of an aircraft engine according to any one of claims 1 to 3, characterized in that: The specific steps are as follows: Step (1): Pumping stage During the air extraction stage, the first inlet and outlet of the three-way valve (6) are opened, the second inlet of the three-way valve (6) is closed, and the vacuum pump (10), the electric control valve (7) and the gas cylinder (9) are connected; the vacuum pump (10) is turned on to start air extraction, and when the reading of the pressure gauge (8) is less than 10 kPa, the three-way valve (6), the vacuum pump (10) and the electric control valve (7) are closed, so that the gas cylinder (9) is under negative pressure; Step (2): Collection phase Before the collection phase begins, weigh the mass of the filtration system. Connect the outlet of the filtration system to the inlet of the cooling coil (5), connect the outlet of the cooling coil (5) to the second inlet of the three-way valve (6), and close the first inlet of the three-way valve (6); at the beginning of the collection, connect the starting end of the collection system to the exhaust end, check the tightness, and wait for the experimental ignition after there is no leakage. When the combustion products are observed to be ejected from the rear of the aircraft engine rich fuel gas generator, open the electric control valve (7) and the second inlet and outlet of the three-way valve (6) in turn, so that the solid and liquid components of the gas are filtered, collected and cooled, and then enter the gas cylinder (9), and the collection phase is completed; Step (3): Gas collection and detection analysis Remove the filtration system, weigh the mass again, compare it with the mass before the collection phase, and calculate the mass of the solid and liquid components in the fuel gas; remove the pressure gauge (8) and the gas cylinder (9), let it stand for 2-3 days until the pressure gauge reading is stable, use a gas capture bag to collect a preset mass of fuel gas sample, dissolve it in anhydrous ethanol, perform gas chromatography analysis under selected chromatographic conditions, and determine the actual concentration of each component in the fuel gas from the concentration-time curve of the fuel gas sample.

5. The collection and detection method according to claim 4, characterized in that: The gas chromatography analysis conditions are as follows: the chromatographic column is an HP-5 weak polar capillary column; the carrier gas is hydrogen; the injector temperature is controlled at 260°C; the programmed temperature rise method: the initial temperature is 40°C; the heating rate during the heating process from 40 to 120°C is 3°C / min; the heating rate during the heating process from 120 to 260°C is 10°C / min; 260°C: hold for 5 minutes.

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