Safety treatment method for high-flow methane-rich fuel gas of fuel-rich generator

Abstract

A safety treatment method for high-flow methane-rich fuel gas of a fuel-rich generator comprises the steps that through a low-temperature methane and fuel-rich fuel gas emission ignition performance scaling ground test, an igniter energy value and igniter arrangement position parameters during low-temperature methane and fuel-rich fuel gas emission combustion are determined; and then the oxyhydrogen torch type igniter design and ignition reliability research are carried out, the oxyhydrogen mixing ratio parameter is adjusted, and the oxyhydrogen torch type igniter meeting the optimal igniter energy is created through the similarity principle, so that safe combustion treatment of low-temperature methane and rich combustion gas emission is achieved, and the safety of test bed equipment and testers in the test process is guaranteed.

Description

Technical Field

[0001] The invention relates to a safe treatment method for a large-flow methane-rich gas of a rich-fuel generator, which is used to achieve harmless treatment of low-temperature methane and rich-fuel gas. Background Art

[0002] During the pre-cooling, post-test pressure relief, and emergency release stages of the development of liquid oxygen-methane engines, a large amount of cryogenic gas and liquid methane will be emitted. The emitted cryogenic methane may cause frostbite, cryogenic anesthesia, etc. to personnel, and cause low-temperature brittle damage to the equipment; at the same time, the rapid phase change of liquid methane endothermic may also cause overpressure and damage surrounding equipment. In addition, during the rich-fuel generator test, a large flow of high-temperature methane-rich fuel gas will be emitted. If it is not handled promptly and safely, it will endanger the safety of the test bench equipment and test personnel. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a method for safely handling large flow methane-rich gas in a rich-burn generator test by using a hydrogen-oxygen torch igniter. The present invention mainly involves two parts: low-temperature methane and rich-burn gas emission ignition performance scaled-down ground test and hydrogen-oxygen torch igniter selection. The method steps are as follows:

[0004] Low-temperature methane and rich-fuel gas emission ignition performance scaled-down ground test: Conduct low-temperature methane and rich-fuel gas emission ignition performance scaled-down ground test, obtain methane gas emission parameters of the scaled-down test based on the original test state data through similarity principle; achieve the effect of methane gas at different temperatures by changing the methane confluence emission source (1) and the liquid nitrogen storage tank (15), obtain different ignition energies by changing the input voltage of the nozzle (27), and continuously adjust the position of the nozzle (27). Carry out ignition tests of different gas temperatures for different ignition energies and different ignition positions, explore the temperature range that different ignition energies can be applied to, and obtain the ignition energy value and igniter layout position that can be used universally under various test temperature conditions, which can be used as a reference for igniter design and safe treatment of low-temperature methane and rich-fuel gas emissions.

[0005] Selection of hydrogen-oxygen torch igniter: Based on the ignition data obtained from the ground scaled-down test, the selection of hydrogen-oxygen torch igniter is carried out. Ignition tests are carried out under different hydrogen-oxygen mixing ratios to keep the ignition area at a high temperature and thereby ignite the surrounding gas to achieve flame diffusion and obtain the most suitable hydrogen-oxygen mixing ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Attached Figure 1 It is a schematic diagram of the method of the present invention.

[0007] Attached Figure 2 It is a schematic diagram of a scaled-down ground test of the ignition performance of low-temperature methane and rich fuel gas emissions of the device of the present invention.

[0008] (1) Methane emission sources

[0009] (2) Methane emission source pressure gauge

[0010] (3) Methane confluence emission source shut-off valve

[0011] (4) Methane line pressure reducer

[0012] (5) Pressure gauge after the pressure reducer

[0013] (6) Methane release valve

[0014] (7) Methane gas supply valve

[0015] (8) Flow meter

[0016] (9) Pressure measurement point

[0017] (10) Temperature measurement point

[0018] (11) Sonic nozzle

[0019] (12) Solenoid valve

[0020] (13) Pressure measurement point

[0021] (14) Temperature measurement point

[0022] (15) Liquid nitrogen storage tank

[0023] (16) Liquid nitrogen storage tank pressure gauge

[0024] (17) Liquid nitrogen discharge valve

[0025] (18) Liquid nitrogen supply valve

[0026] (19) Heat exchanger

[0027] (20) Heat exchanger discharge valve

[0028] (21) Pressure measurement point

[0029] (22) Temperature measurement point

[0030] (23) Gas generator

[0031] (24) Pressure measurement point

[0032] (25) High-speed camera

[0033] (26) DV recorder

[0034] (27) Nozzle

[0035] (28) Oxygen storage tank

[0036] (29) Oxygen tank pressure gauge

[0037] (30) Oxygen tank gas source valve

[0038] (31) Oxygen circuit pressure reducer

[0039] (32) Pressure gauge after pressure reducer

[0040] (33) Oxygen release valve

[0041] (34) Oxygen supply valve

[0042] (35) Flow meter

[0043] (36) Solenoid valve

[0044] (37) Pressure measurement point DETAILED DESCRIPTION

[0045] A specific case is given below to illustrate the method for implementing the present invention.

[0046] 1) First, determine the scaled-down test parameters, and obtain the methane flow parameters of the scaled-down test based on the original test data according to the similarity principle.

[0047] 2) Basis Figure 1 A scaled-down test system is constructed. The methane confluence emission source (1) is used as the methane gas supply source. The methane pressure is controlled by adjusting the pressure reducer (4) and observing the flow meter (8). The sonic nozzle (11) stabilizes the methane flow. The liquid nitrogen outlet valve (18) is adjusted to control the liquid nitrogen input to control the heat exchange effect of the heat exchanger. After the methane completes the heat exchange in the heat exchanger (19), the methane temperature is detected by the temperature measuring point (22). The low-temperature methane pre-cooling emission state at the start-up of the gas generator is simulated, and the methane temperature is controlled between 150K-300K, and the interval is adjusted according to demand. When studying methane gas, the oxygen storage tank (28) is opened, and oxygen is supplied through the oxygen storage tank gas source valve (30), the oxygen line pressure reducer (31) and the oxygen supply valve (34), and then burned in the gas generator (23) to produce methane-rich gas.

[0048] 3) A high-speed camera (25) and a DV recorder (26) are placed at the outlet of the gas generator (23) of the scaled test system. Considering the influence of background lighting on high-speed shooting, a dark background board is preset at the flame combustion position. The tail end of the gas generator (23) is placed at the electric nozzle (27). When low-temperature methane leaks, the electric nozzle is turned on. The ignition performance of the flame under different working conditions is recorded by the high-speed camera (25) and the DV recorder (26), and the data of the combustion chamber pressure measuring point (21) and the nozzle outlet pressure measuring point (24) are recorded.

[0049] 4) Adjust the position and energy of the nozzle (27) and record them, conduct multiple tests, and record the corresponding data.

[0050] 5) Using the data obtained from the scaled-down test as design parameters, the hydrogen-oxygen mixture ratio at the design point is shifted to change the outlet temperature field, and ignition tests are carried out under different hydrogen-oxygen mixture ratio conditions. The state of the ignition high-temperature area and the flame diffusion of the surrounding fuel gas are recorded by a high-speed camera (25) and a DV recorder (26) to determine the hydrogen-oxygen torch igniter that meets the test requirements.

[0051] 6) Through similar principles, taking the oxyhydrogen torch igniter obtained from the scaled-down test as a prototype, we designed and obtained a oxyhydrogen torch igniter that can safely handle large-flow methane-rich gas of the rich-burn generator under actual test conditions, thus ensuring the safety and reliability of the methane-rich gas treatment process during the hot test of the full-size rich-burn generator.

Claims

1. Aiming at the demand for safe treatment of low-temperature methane and rich-fuel gas after emission, a method for safe treatment of large-flow methane-rich gas in rich-fuel generator test was invented. The invention includes two parts: scaled-down ground test of ignition performance of low-temperature methane and rich-fuel gas emission and design of hydrogen-oxygen torch igniter and study of ignition reliability.

2. Low temperature methane and rich fuel gas emission ignition performance scaled ground test features: The test is conducted by using a scaled-down test method obtained from the original test based on similar principles; the combustion parameters when different igniter energy values ​​and igniter arrangement positions are obtained by replacing the igniter with an electric nozzle; the conditions of low-temperature methane gas and methane fuel gas can be simulated: when simulating low-temperature methane conditions, low-temperature methane gas with different temperature parameters is obtained in a supercooler (19) by adjusting a liquid nitrogen storage tank (15) and a methane confluence emission source (1), and the oxygen path is closed so that methane is directly discharged through a gas generator without ignition; when simulating methane fuel gas conditions, the oxygen path is opened so that methane and oxygen are burned in the gas generator to generate high-temperature methane fuel gas.

3. Design of hydrogen-oxygen torch igniter and research on ignition reliability are characterized by: The electric nozzle data is used as the energy basis of the oxyhydrogen igniter. Through the similar principle, the oxyhydrogen igniter that meets the scaled-down test conditions can meet the requirements of the oxyhydrogen torch igniter to achieve the safe treatment of the large-flow methane-rich gas of the rich-burning generator under actual test conditions.

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