CN114113488A - High pressure hydrogen-doped natural gas pipeline leakage spontaneous combustion experimental device - Google Patents
High pressure hydrogen-doped natural gas pipeline leakage spontaneous combustion experimental device Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 239000003345 natural gas Substances 0.000 title claims abstract description 46
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 39
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 38
- 239000001257 hydrogen Substances 0.000 claims abstract description 52
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 52
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000007789 gas Substances 0.000 claims abstract description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000002474 experimental method Methods 0.000 claims abstract description 30
- 238000010926 purge Methods 0.000 claims abstract description 23
- 238000003860 storage Methods 0.000 claims abstract description 20
- 238000011084 recovery Methods 0.000 claims abstract description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 230000003068 static effect Effects 0.000 claims abstract description 16
- 230000001681 protective effect Effects 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000004888 barrier function Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 238000011161 development Methods 0.000 claims description 2
- 238000012800 visualization Methods 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract 1
- 238000011160 research Methods 0.000 description 6
- 230000035939 shock Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000005680 Thomson effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/005—H2
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- Combustion & Propulsion (AREA)
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- General Health & Medical Sciences (AREA)
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Abstract
本发明提供了一种高压掺氢天然气管道泄漏自燃实验装置，整个装置由压缩空气瓶、高压氮气瓶、高压甲烷瓶、高压氢气瓶、阀门、静态混合器、高压储罐、吹扫管道、主体实验管道、可拆卸泄漏片及障碍物、防护箱、高速摄像机、变送器、压力传感器、温度传感器、静电传感器、光电二极管、压力表、真空泵、缓冲罐、尾气回收瓶组成。通过改变阀门开度以及高压气体初始温度可以制取不同温度、压力、掺氢量下的掺氢天然气；通过安装不同泄漏片可以对不同泄漏口截面形状进行实验；从而测试高压掺氢天然气从管道中泄漏后是否发生自燃。本发明克服了现有装置不能对掺氢天然气管道泄漏自燃过程进行实验的缺点，可实现多种情况下的实验，减少了实验成本。
The invention provides an experimental device for leaking and spontaneous combustion of high-pressure hydrogen-mixed natural gas pipeline. The whole device is composed of compressed air bottle, high-pressure nitrogen bottle, high-pressure methane bottle, high-pressure hydrogen bottle, valve, static mixer, high-pressure storage tank, purge pipeline, main body It consists of experimental pipeline, detachable leakage sheet and obstacles, protective box, high-speed camera, transmitter, pressure sensor, temperature sensor, electrostatic sensor, photodiode, pressure gauge, vacuum pump, buffer tank, and exhaust gas recovery bottle. By changing the valve opening and the initial temperature of the high-pressure gas, hydrogen-entrained natural gas at different temperatures, pressures and amounts of hydrogen admixture can be prepared; by installing different leakage sheets, experiments can be carried out on the cross-sectional shapes of different leakage ports; so as to test the flow of high-pressure hydrogen-entrained natural gas from the pipeline Whether spontaneous combustion occurs after the medium leak. The invention overcomes the defect that the existing device cannot conduct experiments on the leakage and spontaneous combustion process of the hydrogen-mixed natural gas pipeline, can realize experiments under various conditions, and reduce the experiment cost.
Description
Technical Field
The invention belongs to the technical field of oil and gas safety, and particularly relates to a high-pressure hydrogen-doped natural gas pipeline leakage spontaneous combustion experimental device.
Background
Hydrogen energy is a novel energy carrier supporting the national strategic energy target of carbon neutralization and carbon peak reaching, and hydrogen only generates water due to the combustion process, so that the hydrogen is valued by all countries in the world. High-pressure storage is the main storage mode of hydrogen energy at present, and the utilization of the natural gas pipeline network in service which is four-way and eight-reach and extends across the country to convey hydrogen to thousands of households is an effective way for realizing large-scale and long-distance conveyance of hydrogen, and the investment for independently constructing hydrogen conveying pipelines can be greatly reduced.
However, hydrogen has extremely low minimum ignition energy (0.02mJ), and when high-pressure hydrogen leaks, due to factors such as friction static electricity and shock wave heating, the gas temperature rises and finally reaches an ignition working condition, so that the hydrogen is spontaneously combusted, and more serious accidents are caused. In the hydrogen leakage combustion explosion accident, about 60 percent of accidents have no obvious ignition source, and in addition, the hydrogen has hydrogen embrittlement effect on the steel pipe, high-pressure hydrogen is easy to leak from the steel storage container, and the risk of hydrogen leakage and spontaneous combustion is not ignored. The mechanism causing the high-pressure hydrogen leakage to spontaneously ignite is currently considered to be mainly the inverse joule thomson effect, diffusion ignition, electrostatic ignition, mechanical friction, impact and the like, wherein the diffusion ignition is a mechanism which is acknowledged to have the largest contribution to the high-pressure hydrogen leakage spontaneous ignition, and numerous experimental researches are carried out based on the theory. The diffusion ignition theory means that when high-pressure hydrogen is leaked and released into air, shock waves are formed in front of a hydrogen jet flow, the shock waves generate high temperature and high pressure, the air behind the shock waves is heated, a hydrogen-air mixed layer in a certain area is formed between the high-temperature air and the front edge of the jet flow, and when the temperature of the mixed layer reaches the ignition temperature and the concentration of the hydrogen is in the ignition range, spontaneous combustion can occur after a period of time delay. The interval time from the leakage of high-pressure pure hydrogen to the formation of spontaneous combustion jet fire is generally tens of microseconds, the minimum leakage pressure capable of causing the hydrogen leakage spontaneous combustion is 1.6-2.3MPa, the conveying pressure of the current domestic in-service natural gas conveying pipeline can reach 4-10MPa, and the pressure requirement of the hydrogen leakage spontaneous combustion is met.
The leakage spontaneous combustion characteristic of the high-pressure hydrogen is different from the leakage process of the traditional natural gas. After the hydrogen is mixed into the natural gas, the physical parameters of the mixed natural gas, such as the components, the minimum ignition energy, the explosion limit and the like, are different from those of pure hydrogen, so that the leakage spontaneous combustion characteristics of the mixed natural gas are different from those of the hydrogen. The research on the condition of the hydrogen loading concentration, the release temperature, the pressure and the like of the hydrogen loading natural gas conveying pipeline to cause spontaneous combustion after leakage has important practical significance for reasonably controlling the operation parameters of the hydrogen loading natural gas conveying pipeline and realizing large-scale safe conveying of hydrogen energy.
According to investigation, for the research on combustible gas leakage spontaneous combustion, two methods, namely simulation and experiment, are mainly adopted. In the aspect of experiments, in the existing patent, patent CN111458371A "premixed gas powder spontaneous combustion experimental pipeline and experimental method" designs an experimental device for researching the gas powder spontaneous combustion process; CN108931499A experiment testing device and experiment testing method for coal spontaneous combustion oxygen concentration designs a testing device and a testing method for testing coal spontaneous combustion concentration. However, no experimental device for the leakage spontaneous combustion process of the high-pressure hydrogen-doped natural gas pipeline exists at present, and the problem that spontaneous combustion can occur due to leakage of the existing hydrogen-doped natural gas conveying pipeline under the conditions of hydrogen doping concentration, leakage pressure, leakage pore diameter and the like is not clear is solved, so that the device disclosed by the patent is necessary for researching the leakage spontaneous combustion process of the high-pressure hydrogen-doped natural gas pipeline and obtaining the safe operation boundary condition of the gas conveying pipeline.
The leakage spontaneous combustion of the high-pressure hydrogen-doped natural gas pipeline is a complex process, and factors influencing the spontaneous combustion comprise gas leakage temperature, leakage pressure, the shape of a leakage opening, whether barriers exist outside the leakage opening and the like. The method adopts high-speed camera shooting, sensor detection and other methods to research the leakage spontaneous combustion rule of the high-pressure hydrogen-doped natural gas pipeline under different conditions, not only can deepen the spontaneous combustion ignition mechanism, but also can provide experimental basis and theoretical support for the formulation of the safe conveying scheme of the high-pressure hydrogen-doped natural gas pipeline.
Disclosure of Invention
The purpose of the invention is: the device can carry out experimental research on the leakage spontaneous combustion ignition of the high-pressure hydrogen-doped natural gas under different hydrogen doping amounts, different pressures, different temperatures and different leakage port shapes. An experimental device for high-pressure natural gas mixed pipeline leakage spontaneous combustion comprises a compressed air cylinder 1, a high-pressure nitrogen cylinder 2, a high-pressure methane cylinder 3, a high-pressure hydrogen cylinder 4, a first tail gas recovery cylinder 5, a first switch valve 6, a second switch valve 7, a third switch valve 8, a fourth switch valve 9, a fifth switch valve 10, a first pressure reducing valve 11, a first pressure gauge 12, a second pressure reducing valve 13, a second pressure gauge 14, a first safety valve 15, a static mixer 16, a third pressure gauge 17, a first buffer tank 18, a first vacuum pump 19, a sixth switch valve 20, a seventh switch valve 21, a high-pressure storage tank 22, a first electric valve 23, pipeline flanges 24,25,47,51, air purge pipelines 26,46, a main body experimental pipeline 27, conversion interfaces 28,30,45,49, fixed flanges 29,31,44,50, a high-speed camera 32, a fourth pressure gauge 33, a protective box 34, The device comprises a detachable barrier 35, a pressure sensor 36, a leakage port 37, a temperature sensor 38, an electrostatic sensor 39, a photodiode 40, a transmitter 41, a data acquisition instrument 42, a data line 43, an eighth switch valve 48, a second electric valve 52, a second vacuum pump 53, a second buffer tank 54, a second safety valve 55, a ninth switch valve 56, a second tail gas recovery bottle 57, detachable leakage sheets 58,59,60,61 and 62 and pipelines for connecting the devices;
the device is characterized in that a high-pressure air supply system of the experimental device is formed by a compressed air bottle 1, a high-pressure nitrogen bottle 2, a high-pressure methane bottle 3, a high-pressure hydrogen bottle 4, a first switch valve 6, a second switch valve 7, a third switch valve 8, a fourth switch valve 9, a first pressure reducing valve 11, a first pressure gauge 12, a second pressure reducing valve 13 and a second pressure gauge 14; the compressed air cylinder 1 is connected to a purging pipeline 26 through a first switch valve 6, the high-pressure nitrogen cylinder 2 is connected to an outlet of the static mixer 16 through a second switch valve 7, the high-pressure methane cylinder 3 is connected to an inlet of the static mixer 16 through a third switch valve 8, a first pressure reducing valve 11 and a first pressure gauge, and the high-pressure hydrogen cylinder 4 is connected to the other inlet of the static mixer 16 through a fourth switch valve 9, a second pressure reducing valve 13 and a second pressure gauge 14; the high-pressure gas supply system provides air required for purging, nitrogen required for checking air tightness and methane and hydrogen at specific pressure and temperature required by experiments for the experimental device. The first tail gas recovery bottle 5, the fifth switch valve 10, the first safety valve 15, the static mixer 16, the third pressure gauge 17, the first buffer tank 18, the first vacuum pump 19 and the sixth switch valve 20 form an experimental device gas mixing system; the outlet of the static mixer 16 is connected with a gas branch pipeline of a high-pressure nitrogen cylinder 2 and is connected with a seventh switch valve in front of a high-pressure storage tank 22 through a third pressure gauge 17, the seventh switch valve 21 is connected with a first tail gas recovery cylinder 5 through a sixth switch valve 20, a first vacuum pump 19, a first buffer tank 18 and a fifth switch valve 10, and a branch pipeline is arranged between the fifth switch valve 10 and the first buffer tank 18 and is connected with a first safety valve 15; the gas mixing system can provide the required natural gas doped with hydrogen under the specific hydrogen concentration for the experimental device, and has a tail gas treatment function. The seventh switch valve 21, the high-pressure storage tank 22, the first electric valve 23, the pipeline flanges 24 and 25, the purging pipelines 26 and 46, the main body experiment pipeline 27, the conversion interfaces 28 and 30, the fixed flanges 29 and 31, the detachable barrier block 35 and the leakage port 37 form an experiment device high-pressure storage tank and a pipeline system; an inlet and an outlet of the high-pressure storage tank 22 are respectively connected with a seventh switch valve 21 and a first electric valve 23, an outlet of the first electric valve 23 is connected with a main body experiment pipeline 27 through a pipeline flange 25, a pipeline from the first switch valve 6 is connected to an air purging pipeline 26 through a pipeline flange 24, and a purging pipeline 46 is arranged on the other side of the protective box 34; the high-pressure storage tank and the pipeline system are used as a main experiment part of the experiment device, so that temporary storage of the hydrogen-doped natural gas, supply of the hydrogen-doped natural gas with a specific flow rate for a main experiment pipeline and a leakage spontaneous combustion experiment of the hydrogen-doped natural gas under the condition of obstacles or no obstacles can be realized. The conversion interfaces 28,30,45 and 49, the fixing flanges 29,31,44 and 50, the fourth pressure gauge 33 and the protection box 34 form an experimental device safety protection system; the conversion interfaces 28,30,45,49 and the fixing flanges 29,31,44,50 are used for fixing the main experiment pipeline 27 and the purging pipelines 26,46 on the protective box 34, and the fourth pressure gauge is arranged at the top of the protective box 34; the safety protection system provides a safe test space for the spontaneous combustion of the leaked hydrogen-doped natural gas, and protects operators. The high-speed camera 32, the pressure sensor 36, the temperature sensor 38, the electrostatic sensor 39, the photodiode 40, the transmitter 41, the data acquisition instrument 42 and the data line 43 form an experimental device data acquisition system; the high-speed camera 32 is erected outside the protective box 34 and emphatically shoots a rectangular area near the outer part of the pipeline leakage port 37; a certain number of pressure sensors 36 and temperature sensors 38 are arranged on two sides of a pipeline leakage port 37, an electrostatic sensor 39 is arranged near the pipeline leakage port 37, a photodiode 40 is arranged on the pipe wall of the pipeline, which is opposite to the leakage port 37, a transmitter 41 is arranged on the pipe wall near the pipeline leakage port 37, and a high-speed camera, the sensors and the transmitter are connected to a data acquisition instrument 42 through a data line 43; the data acquisition system can record the temperature, pressure, static electricity and flame development process in the leakage process of the natural gas doped with hydrogen near the inside and outside of the leakage port, and transmit the recorded data to realize visualization. The eighth switch valve 48, the second electric valve 52, the second vacuum pump 53, the second buffer tank 54, the second safety valve 55, the ninth switch valve 56 and the second tail gas recovery bottle 57 form a tail gas recovery system of the experimental device; the second electric valve connects the header of the purge pipeline 46 and the main body experiment pipeline 27 with the second vacuum pump 53, the second vacuum pump 53 is connected to the second tail gas recovery bottle 57 through the second buffer tank 54 and the ninth switch valve 56, and a branch pipe is arranged between the second buffer tank 54 and the ninth switch valve 56 and is connected to the second safety valve 55; the tail gas recovery system can collect air, nitrogen and hydrogen-doped natural gas used in the experimental process, and plays a role in cleaning the experimental device.
Due to the adoption of the technical scheme, the invention can achieve the following beneficial effects:
(1) the flow of methane and hydrogen can be controlled by controlling different degrees of closure of the third switch valve 8 and the fourth switch valve 9, and the pressure of methane and hydrogen can be controlled by controlling different degrees of closure of the first reducing valve 11 and the second reducing valve 14. Compressed methane and hydrogen gas sources with different initial temperatures are adopted and mixed by a static mixer 16, so that the preparation of the hydrogen-doped natural gas with different temperatures, pressures and hydrogen-doping ratios can be realized;
(2) by installing the leakage sheets (the reducing leakage sheet 58, the parallel leakage sheet 59, the reducing and gradually expanding leakage sheet 60, the gradually expanding leakage sheet 61 and the gradually expanding and reducing leakage sheet 62) with different cross-sectional shapes on the leakage port 37, the research on the leakage spontaneous combustion of the natural gas doped with hydrogen under the condition of different cross-sectional shapes of the leakage port can be realized;
(3) the protective box 34 is made of a transparent pressure-bearing material, so that the operator can conveniently observe the experimental result outside the box body while protecting the operator, and the experimental result is recorded by using the high-speed camera 32;
(4) through first tail gas recovery bottle 5, second tail gas recovery bottle 57 and supporting vacuum apparatus, can realize retrieving the air, nitrogen gas and the natural gas of adding hydrogen that the experiment overall process used, make whole experimental apparatus have safe, economic characteristics.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for testing spontaneous combustion of natural gas leakage.
In the figure: 1-compressed air bottle, 2-high pressure nitrogen bottle, 3-high pressure methane bottle, 4-high pressure hydrogen bottle, 5-first tail gas recovery bottle, 6-first switch valve, 7-second switch valve, 8-third switch valve, 9-fourth switch valve, 10-fifth switch valve, 11-first pressure reducing valve, 12-first pressure gauge, 13-second pressure reducing valve, 14-second pressure gauge, 15-first safety valve, 16-static mixer, 17-third pressure gauge, 18-first buffer tank, 19-first vacuum pump, 20-sixth switch valve, 21-seventh switch valve, 22-high pressure storage tank, 23-first electric valve, 24,25,47, 51-pipeline flange, 26, 46-air purge pipeline, 27-main experiment pipeline, 28,30,45, 49-conversion interface, 29,31,44, 50-fixed flange, 32-high speed camera, 33-fourth pressure gauge, 34-protective box, 35-detachable barrier, 36-pressure sensor, 37-leakage port, 38-temperature sensor, 39-electrostatic sensor, 40-photodiode, 41-transmitter, 42-data acquisition instrument, 43-data line, 48-eighth switch valve, 52-second electric valve, 53-second vacuum pump, 54-second buffer tank, 55-second safety valve, 56-ninth switch valve, 57-second tail gas recovery bottle, 58,59,60,61, 62-detachable leakage sheet.
FIG. 2 is a schematic top view of a part of a protective box of the apparatus according to the present invention;
FIG. 3 shows the operating steps required for carrying out an experiment using the apparatus according to the invention.
Detailed Description
The present invention will be further described with reference to fig. 1 and 3, but the present invention has various embodiments and is not limited to the following embodiments.
The invention relates to a high-pressure hydrogen-doped natural gas pipeline leakage spontaneous combustion experimental device, which comprises: 1-compressed air bottle, 2-high pressure nitrogen bottle, 3-high pressure methane bottle, 4-high pressure hydrogen bottle, 5-first tail gas recovery bottle, 6-first switch valve, 7-second switch valve, 8-third switch valve, 9-fourth switch valve, 10-fifth switch valve, 11-first pressure reducing valve, 12-first pressure gauge, 13-second pressure reducing valve, 14-second pressure gauge, 15-first safety valve, 16-static mixer, 17-third pressure gauge, 18-first buffer tank, 19-first vacuum pump, 20-sixth switch valve, 21-seventh switch valve, 22-high pressure storage tank, 23-first electric valve, 24,25,47, 51-pipeline flange, 26, 46-air purge pipeline, 27-main experiment pipeline, 28,30,45, 49-conversion interface, 29,31,44, 50-fixed flange, 32-high speed camera, 33-fourth pressure gauge, 34-protective box, 35-detachable barrier, 36-pressure sensor, 37-leakage port, 38-temperature sensor, 39-electrostatic sensor, 40-photodiode, 41-transmitter, 42-data acquisition instrument, 43-data line, 48-eighth switch valve, 52-second electric valve, 53-second vacuum pump, 54-second buffer tank, 55-second safety valve, 56-ninth switch valve, 57-second tail gas recovery bottle, 58,59,60,61, 62-detachable leakage sheet.
The specific implementation mode is as follows:
the first step is as follows: assembling an experimental device to enable all valves to be in a closed state, and installing a detachable barrier block 35 and a detachable leakage sheet;
the second step is that: opening the second switch valve 7, the seventh switch valve 21 and the first electric valve 23, discharging nitrogen in the compressed nitrogen cylinder 2, pressurizing the main body part of the device to 5MPa, and maintaining for 5 minutes to realize pressure test;
the third step: closing the second switch valve 7, opening the first switch valve 6, the fifth switch valve 10, the sixth switch valve 20, the eighth switch valve 48, the second electric valve 52 and the ninth switch valve 56, purging the device by using air in the compressed air bottle 1, closing the first switch valve 6 after purging for 2 minutes, starting the first vacuum pump 19 and the second vacuum pump 53, closing the valves at two sides of the protective box 34 when the pressure in the protective box 34 approaches 101325Pa, closing the vacuum pumps when other pressure gauges indicate that the gauge pressure in the device is reduced to 0, completing purging, and closing all the rest valves;
the fourth step: and opening the third switch valve 8 and the fourth switch valve 9, and controlling the opening degree of the valves to enable the flow ratio of the methane to the hydrogen to be 4: 1, controlling the pressure of a first pressure reducing valve 11 and a second pressure reducing valve 13 to be 4MPa by using a first pressure gauge 12 and a second pressure gauge 14, opening a seventh switch valve 21, and injecting the prepared hydrogen-doped natural gas into a high-pressure storage tank 22 for temporary storage;
the fifth step: starting the high-speed camera 32 and the data acquisition instrument 42 to prepare for recording the experimental result;
and a sixth step: opening the first electric valve 23 and the second electric valve 52, releasing the hydrogen-doped natural gas in the high-pressure storage tank into the pipeline, performing a hydrogen-doped natural gas pipeline leakage spontaneous combustion experiment, and recording the result;
the seventh step: closing the high-speed camera 32 and the data acquisition instrument 42, closing the first electric valve 23, opening the first switch valve 6, the fifth switch valve 10, the sixth switch valve 20, the eighth switch valve 48, the second electric valve 52 and the ninth switch valve 56, purging residual hydrogen-doped natural gas in the device by using air in the compressed air bottle 1, closing all valves after purging for 2 minutes, and treating the collected gas in the tail gas collecting bottle to complete one round of experiment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114963017A (en) * | 2022-04-24 | 2022-08-30 | 深圳市燃气集团股份有限公司 | Natural gas line hydrogen-mixing comprehensive experiment system device |
| CN115791526A (en) * | 2022-11-29 | 2023-03-14 | 中国计量大学 | Experimental device and method for testing diffusion behavior of micro-leakage gas in limited space |
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