CN112763540B - Explosion-proof test system and test method - Google Patents
Explosion-proof test system and test method Download PDFInfo
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- CN112763540B CN112763540B CN202011610254.7A CN202011610254A CN112763540B CN 112763540 B CN112763540 B CN 112763540B CN 202011610254 A CN202011610254 A CN 202011610254A CN 112763540 B CN112763540 B CN 112763540B
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- 238000012360 testing method Methods 0.000 title claims abstract description 255
- 238000010998 test method Methods 0.000 title claims abstract description 8
- 239000007789 gas Substances 0.000 claims abstract description 375
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000001301 oxygen Substances 0.000 claims abstract description 34
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 34
- 239000000203 mixture Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000001105 regulatory effect Effects 0.000 claims description 115
- 238000002156 mixing Methods 0.000 claims description 56
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 32
- 238000004868 gas analysis Methods 0.000 claims description 21
- 238000004880 explosion Methods 0.000 claims description 18
- 239000001257 hydrogen Substances 0.000 claims description 14
- 229910052739 hydrogen Inorganic materials 0.000 claims description 14
- 238000010926 purge Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 11
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 8
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims description 8
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 6
- 239000005977 Ethylene Substances 0.000 claims description 6
- 239000003595 mist Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000001294 propane Substances 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 4
- 150000002431 hydrogen Chemical class 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000005085 air analysis Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000001629 suppression Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 4
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 238000002474 experimental method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 101100309712 Arabidopsis thaliana SD11 gene Proteins 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011076 safety test Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000010408 sweeping Methods 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
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/50—Investigating or analyzing materials by the use of thermal means by investigating flash-point; by investigating explosibility
- G01N25/54—Investigating or analyzing materials by the use of thermal means by investigating flash-point; by investigating explosibility by determining explosibility
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- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention relates to an explosion-proof test system and a test method, wherein the system comprises 5 explosion-proof test tanks, the volume of the 5 explosion-proof test tanks is from small to large, the system is divided into 3 independent test subsystems, the 3 test subsystems can test simultaneously, only one explosion-proof test tank with the smallest volume in the first test subsystem, and the other two test subsystems comprise two explosion-proof test tanks which are connected in parallel. Each test subsystem uses the same combustible gas mixture for each test, and 3 test subsystems can use 3 identical or 3 different combustible gas mixtures for simultaneous tests. Through system design, simultaneous gas distribution and simultaneous test of a plurality of samples can be completed, and the utilization rate and the test efficiency of the system are improved; the gas in the pipeline is not required to be replaced in the gas distribution process, so that the gas distribution time is shortened; and the flow regulation is combined with the oxygen-containing test to ensure the air distribution precision.
Description
Technical Field
The invention relates to a safety test technology of electrical equipment, in particular to an explosion-proof test system and a test method.
Background
The explosion-proof performance test of the explosion-proof electrical product is generally carried out in an explosion-proof test tank, and in order to enable the explosion-proof test tank to reach the combustible gas concentration range of a standard regulation test, the gas in the explosion-proof test tank is generally replaced by a vacuum method or a purging method before the explosion-proof test, and the experiment is carried out after the requirement of the experiment gas is met. In each experiment, according to the structure of a test sample and the test requirement, the specification of the explosion-proof test tank and the introduced combustible mixed gas are different, as shown in fig. 1, the conventional test system generally comprises units of ternary gas distribution, gas exhaust, gas return and the like besides the explosion-proof test tank, and the explosion-proof test tanks with various specifications are connected on a common pipeline and can share various peripheral devices, so that the system is suitable for various explosion-proof tests.
The conventional configuration combustible gas in ternary gas distribution is methane, hydrogen and compressed air, but along with the diversification of materials used by a sample, different other configuration requirements are often met, the gas mixing combination realized by the flame-proof test system with the structure is less, and different gas tanks need to be replaced each time, so that the time and labor are consumed.
As 5 tanks share a conveying pipeline, the configured gas needs to be conveyed to the tank body for testing through a long gas path, and only one mixed gas can be configured at a time, so that only one tank body can be used for testing at a time. Resulting in low system utilization and considerable waste of gas on the pipeline in gas substitution, as well as increased substitution times.
Disclosure of Invention
In order to improve the test efficiency of the conventional explosion-proof test and reduce labor, an explosion-proof test system and a test method are provided, so that the same steel cylinder group is provided with combustible gases with different components for different test groups, and the gas switching is realized without affecting the gas distribution precision under the condition that the gas in a pipeline is not required to be replaced.
The technical scheme of the invention is as follows: the explosion-proof test system comprises 5 explosion-proof test tanks, wherein the volume of the 5 explosion-proof test tanks is from small to large, the system is divided into 3 independent test subsystems, only one explosion-proof test tank with the smallest volume is arranged in the first test subsystem, and the other two test subsystems comprise two explosion-proof test tanks which are connected in parallel;
each test subsystem comprises three groups of adjusting and detecting air circuits, a group of air mixing air circuits, a tank input adjusting valve group, a flameproof test tank, a tank output adjusting valve group, a group of pressure adjusting air circuits, a group of air analysis pipelines, a tank controller, an ignition pressure measuring device, a high-speed camera and a plurality of temperature and pressure sensors; the 3 independent test subsystems share a vacuum pump and various gas tanks for filling gas, methane, propane, ethylene and acetylene are filled as a first group of gas tanks, hydrogen and nitrogen are filled as a second group of gas tanks, oxygen and compressed air are filled as a third group of gas tanks, the output end of each gas tank is connected with a manual valve, each gas tank of the gas is corresponding to a unique gas pipeline, the front ends of the hydrogen gas in the first group of gas tanks and the second group of gas tanks, which enter a first group of adjusting and detecting gas paths, are respectively connected with a controllable conducting valve corresponding to each gas pipeline, the front ends of the second group of gas tanks, which enter a second group of adjusting and detecting gas paths, are respectively connected with a controllable conducting valve corresponding to each gas pipeline, and the third group of gas tanks directly enter the third group of adjusting and detecting gas paths; the output ends of the gas mixing gas paths are connected with each explosion-proof test tank through a tank body input regulating valve group and a tank body output regulating valve group;
the two sides of each explosion-proof test tank are symmetrically provided with a plurality of groups of tank body input regulating valve groups, tank body output regulating valve groups and explosion-proof test tank inlet and outlet pipelines formed by vent pipelines, and the inlet and outlet pipelines of each explosion-proof test tank are respectively connected with an exhaust port through a corresponding pressure regulating gas circuit, a corresponding gas analysis pipeline and a vacuum pump;
the pressure detected by the pressure sensor on the output pipeline of the gas circuit, the three groups of gas mixing circuits and each explosion-proof test tank is regulated, the temperature detected by the temperature sensor in each explosion-proof test tank is regulated, the oxygen content data detected by each group of gas analysis pipelines are sent to the corresponding tank body controller by high-speed shooting through the flame propagation state data in the explosion shot by the observation window, and the tank body controller outputs control signals to the conduction valve, the regulating valve and the ignition pressure measuring device to realize the test.
The adjusting and detecting gas paths corresponding to the methane, the propane, the ethylene, the acetylene, the hydrogen, the nitrogen and the oxygen are the same, and each adjusting and detecting gas path sequentially comprises a first flame arrester, a manual valve, a filter, a pressure reducing valve, a pressure sensor, a conducting valve, a gas flowmeter, a second flame arrester and a one-way valve; the oxygen and the compressed air are used as non-combustible gas distribution gas, the adjusting and detecting gas paths are partially shared, the compressed air is firstly discharged through a manual valve after being dried through an oil mist separator and a cold dryer after entering the adjusting and detecting gas paths, then sequentially enters a compressed air filter, a compressed air pressure reducing valve, a compressed air pressure sensor, a compressed air conducting valve, a non-combustible gas distribution gas flowmeter, a non-combustible gas distribution flame arrester and a non-combustible gas distribution one-way valve, and enters a gas mixing gas path, and the oxygen and the compressed air share the rear part of the non-combustible gas distribution gas flowmeter, the non-combustible gas distribution flame arrester and the non-combustible gas distribution one-way valve.
The gas mixing gas circuit sequentially comprises a static gas mixing device, a mixing container, a third flame arrester, a gas mixing gas circuit pressure sensor and a regulating valve; the tail end of the gas mixing gas circuit is divided into three paths through a regulating valve, one path of the gas is communicated with a tank input regulating valve group and a tank output regulating valve group of a tank controller, the other path of the gas is connected with an exhaust port through a pressure regulating gas circuit, and the other path of the gas is connected with the exhaust port through a gas analysis pipeline;
the pressure regulating valve is connected in series with one regulating valve and then connected with the other regulating valve in parallel to form a pressure regulating air path; the regulating valve is connected in series with the gas analyzer to form a gas analysis pipeline.
The pressure regulating valve is connected in series with one regulating valve and then connected with the other regulating valve in parallel to form a pressure regulating air path; a regulating valve is connected in series with a gas analyzer to form a gas analysis pipeline.
The testing method of the explosion-proof testing system specifically comprises the following steps:
and (3) distributing gas in the first step: opening a manual valve at the output end of one gas in the first combustible gas and the third group of gas tanks, opening two groups of adjusting and detecting gas paths, one group of gas mixing gas paths and one group of gas analysis pipelines corresponding to the gas tanks in a test subsystem corresponding to the explosion-proof test tank of the sample to be tested, and closing other pipelines;
the method comprises the steps that a tank body controller in a test subsystem receives opening signals of a gas flowmeter and a regulating valve in two groups of regulating and detecting gas paths simultaneously, the tank body controller outputs control signals to a conducting valve at the front end of the two gas flowmeters to control the flow of single gas before mixing of each path, and after the mixed oxygen content of the two gases is achieved, if the mixed oxygen content of the two gases is required, a manual valve at the output end of a third gas tank is opened, under the control of the tank body controller, the conducting valve at the front end of the third gas regulating and detecting gas path is opened, and the tank body controller controls the conducting valve at the front end of the regulating and detecting gas path to control the flow of the third gas until the oxygen content detected by a gas analyzer reaches the required concentration obtained by calculation, so that the gas distribution of combustible gas is completed; closing a regulating valve at the output end of the gas mixing gas circuit;
and a second step of performing gas replacement on the explosion isolation test tank: gas displacement is carried out by one of two methods, the following one of which is optional;
1) And (3) carrying out gas replacement by a vacuum method:
all tank body input regulating valve groups and tank body output regulating valve groups corresponding to the explosion-proof test tanks with the samples to be tested are opened, all regulating valves communicated with the vacuum pump are opened, other regulating valves are closed, the vacuum pump is opened, the explosion-proof test tanks are vacuumized, meanwhile, pressure detection is carried out through a pressure sensor on a pipeline of the output regulating valve groups, and when the fact that the air pressure in the corresponding explosion-proof test tanks is negative is detected, the regulating valves on the corresponding explosion-proof test tanks and the channels of the vacuum pump are closed;
opening a regulating valve at the output end of the combustible gas mixture and a regulating valve on a passage communicated with the explosion-proof test tank with the sample to be tested, uniformly filling the combustible gas mixture into the two explosion-proof test tanks, and closing the regulating valves on the passages communicated with all the output ends of the combustible gas mixture and the explosion-proof test tanks when the combustible gas mixture in the explosion-proof test tanks is completely filled and the pressure reaches a set value;
2) And the gas replacement is carried out by a purging method:
opening a flammable gas mixture output end regulating valve and all regulating valves on all input and output passages of the test tank with the sample to be tested, simultaneously opening all passages between the test tank and the exhaust port to form the flow of the flammable gas mixture left and right in the two test tanks, displacing the gas in the test tank, opening a corresponding gas analysis pipeline to detect the concentration of the gas blown out from the exhaust port, and if the concentration reaches the concentration of the flammable gas mixture entering the test tank, indicating that the displacement is completed, and closing all regulating valves under the control of a tank body controller;
and thirdly, performing explosion suppression test:
igniting under the control of a tank controller, performing explosion test on samples in two explosion-proof test tanks through an ignition pressure measuring device and a high-speed camera to acquire data, monitoring the pressure and the temperature in the tank after explosion to obtain a pressure waveform and a temperature change curve in a time period, and judging according to a test standard; the high-speed camera is arranged outside the explosion-proof test tank, and the flame propagation state during explosion is shot and collected through the observation window;
fourth, purging pipelines in the explosion-proof test tank and from the explosion-proof test tank to the exhaust port: and opening a passage from the compressed air to the explosion-proof test tank to the vacuum pump, and blowing the pipeline communicated with all explosion-proof test tanks to the exhaust port in the tank body by the compressed air while vacuumizing the vacuum pump.
According to the testing method of the explosion-proof testing system, when the combustible gas required by testing of two samples is identical, the two samples are respectively placed into two explosion-proof test tanks of one testing subsystem, one path of gas distribution is sequentially carried out, the two explosion-proof test tanks are simultaneously subjected to gas replacement, the two explosion-proof test tanks are simultaneously subjected to explosion-proof test, and the two explosion-proof test tanks are simultaneously subjected to purging through pipelines from the tank bodies and the explosion-proof test tanks to the exhaust ports.
According to the testing method of the explosion-proof testing system, when the combustible gas required by testing of two samples is different, the two samples are respectively placed into two explosion-proof test tanks of the two testing subsystems, two gas distribution paths are sequentially and simultaneously carried out, the two explosion-proof test tanks are simultaneously subjected to gas replacement, the two explosion-proof test tanks are simultaneously subjected to explosion-proof test, and the two explosion-proof test tanks are simultaneously subjected to purging on pipelines from the tank bodies to the exhaust ports.
The invention has the beneficial effects that: according to the explosion-proof test system and the test method, through the system design, simultaneous gas distribution and simultaneous test of a plurality of samples can be completed, and the utilization rate and the test efficiency of the system are improved; the gas in the pipeline is not required to be replaced in the gas distribution process, so that the gas distribution time is shortened; and the flow regulation is combined with the oxygen-containing test to ensure the air distribution precision.
Drawings
FIG. 1 is a schematic diagram of a flame-proof testing device;
FIG. 2 is a schematic diagram of the flameproof test system of the present invention.
Reference numerals: 1. a gas tank; 2. a manual valve (SD); 3. a conduction valve (K); 4. flame arresters (ZH); 5. a filter (GL); 6. a pressure relief valve (JF); 7. a pressure sensor (Y); 8. a gas flow Meter (MFC); 9. a one-way valve (DF); 10. a static gas mixing device (JH); 11. a mixing container (HC); 12. a regulating valve (ZK); 13. a tank controller; 14. an ignition pressure measuring device; 15. explosion isolation test tank; 16. a sample; 17. a temperature sensor (W); 18. a high-speed camera; 19. a vacuum pump (ZB); 20. an exhaust port; 21. a pressure regulating valve (TY); 22. a gas analyzer; 23. an oil mist separator (YL); 24. cold dryer (LG).
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
As shown in the structural schematic diagram of the explosion-proof test system in FIG. 2, the system comprises 5 explosion-proof test tanks, the volume of the 5 explosion-proof test tanks is from top to bottom, the system is divided into 3 independent test subsystems, the 3 test subsystems can test simultaneously, only one explosion-proof test tank with the minimum volume in the first test subsystem, and the other two test subsystems comprise two explosion-proof test tanks connected in parallel. Each test subsystem uses the same combustible gas mixture for each test, and 3 test subsystems can use 3 identical or 3 different combustible gas mixtures for simultaneous tests.
The system comprises a gas tank, an array adjusting and detecting gas circuit, three groups of gas mixing gas circuits, a tank body input adjusting valve group, 5 explosion-proof test tanks, a tank body output adjusting valve group, three groups of pressure adjusting gas circuits, three groups of gas analysis pipelines, a vacuum pump, three tank body controllers, three ignition pressure measuring devices, three high-speed shooting and a plurality of temperature and pressure sensors, wherein methane, propane, ethylene and acetylene are arranged as a first group of gas tanks, hydrogen and nitrogen are arranged as a second group of gas tanks, oxygen and compressed air are arranged as a third group of gas tanks, the output ends of the gas tanks of the gas are connected with manual valves (SD 1, SD2, SD3, SD4, SD8, SD9, SD13 and SD 14), the corresponding manual valves are opened according to the gas requirement of the required configuration, each gas tank corresponds to a unique gas pipeline, the front ends of the first group of gas tanks and the second group of gas tanks, which enter the first group of adjusting and detecting gas pipelines, are respectively connected with a controllable conducting valve 3 (K), the front ends of the second group of gas tanks which enter the second group of adjusting and detect the corresponding gas pipelines are also connected with the third group of gas pipelines, and the gas tanks of the second group of adjusting and the gas tanks of which enter the third group of gas channels. The three groups of adjusting and detecting gas circuit outputs are communicated with one gas mixing gas circuit, the gas mixing gas circuit outputs are detected through a gas analysis pipeline until the detection reaches the experiment distribution requirement, the gas mixing gas circuit outputs are controlled by a tank body controller 13 to enter a explosion-proof test tank 15 for gas replacement, after the explosion-proof test tank 15 is full of combustible gas mixture, an explosion experiment is carried out on a sample 16 in the tank body by ignition, an ignition pressure measuring device 14, a tank body temperature sensor 17 and a high-speed camera 18 carry out experiment data acquisition, the tank body controller 13 collects data, and after the experiment is finished, the explosion-proof test tank residual gas treatment is controlled.
Every three groups of adjusting and detecting air circuits correspond to one group of gas mixing air circuits, and each group of gas mixing air circuits corresponds to one group of pressure adjusting air circuits and one group of gas analysis pipelines.
The regulating and detecting gas paths of methane, propane, ethylene, acetylene, hydrogen, nitrogen and oxygen are the same, and each gas path sequentially comprises a first flame arrester 4 (ZH), a manual valve (SD), a filter 5 (GL), a pressure reducing valve 6 (JF), a pressure sensor 7 (Y), a conducting valve (K), a gas flow meter 8 (MFC), a second flame arrester (ZH) and a one-way valve 9 (DF); the oxygen and the compressed air are used as non-combustible gas to be matched with gas, the adjusting and detecting gas circuit is shared by parts, the compressed air needs to be subjected to gas treatment before entering the adjusting and detecting gas circuit, namely, the compressed air is firstly subjected to the oil mist separator 23 (YL) and the cold dryer 24 (LG) to ensure drying and then is output through the manual valve SD14, and then sequentially enters the gas mixing gas circuit through the filter GL10, the pressure reducing valve JF10, the pressure sensor Y13, the conducting valve (K), the gas flow Meter (MFC), the flame arrester (ZH) and the one-way valve (DF), and the oxygen and the compressed air share the rear part of the gas flow Meter (MFC), the flame arrester (ZH) and the one-way valve (DF).
The gas mixing path sequentially comprises a static gas mixing device 10 (JH), a mixing container 11 (HC), a flame arrester (ZH), a pressure sensor (Y) and a regulating valve 12 (ZK). The tail end of the gas mixing gas circuit is divided into three paths through a regulating valve, one path is led into a tank body input regulating valve group and a tank body output regulating valve group of the tank body controller, the other path is connected with the exhaust port 20 through a pressure regulating gas circuit, and the other path is connected with the exhaust port 20 through a gas analysis pipeline. The pressure regulating valve (TY) is connected in series with one regulating valve (ZK) and then is connected with the other regulating valve (ZK) in parallel to form a pressure regulating air path. The regulating valve (ZK) is connected in series with the gas analyzer to form a gas analysis pipeline.
And a plurality of groups of tank body input regulating valve groups, a tank body output regulating valve group and an air pipeline form an inlet pipeline and an outlet pipeline of the explosion-proof test tank symmetrically on two sides of each explosion-proof test tank, and a sample is placed in the middle of each explosion-proof test tank.
The inlet and outlet pipelines of each explosion-proof test tank are connected with the exhaust port 20 through a controllable regulating valve (ZK) and a vacuum pump.
The system carries out the testing steps, namely the first step of preparing the combustible gas mixture, the second step of replacing the gas in the explosion-proof test tank, the third step of carrying out the explosion-proof test, and the last step of purging the explosion-proof test tank and the pipeline from the explosion-proof test tank to the exhaust port.
The second test subsystem is taken as an example, and specific test control of the two test subsystems is described according to the test steps. The other two test subsystems have the same working principle.
And (3) distributing gas in the first step: taking the mixing of combustible gas and air as an example, wherein the proportion of methane and hydrogen in the combustible gas is known, the manual valves SD1 and SD14 at the output ends of a methane gas tank and a compressed air gas tank are firstly opened, under the control of a tank controller 13, the conducting valve at the front end of a regulating and detecting gas path is opened, methane sequentially enters a second group of gas mixing gas paths through a flame arrester ZH8, a manual valve SD10, a filter GL4, a pressure reducing valve JF4, a pressure sensor Y5, a conducting valve K5, a gas flowmeter MFC4, a flame arrester ZH11 and a one-way valve DF4 in a first regulating and detecting gas path, compressed air sequentially enters the second group of gas mixing gas paths through the manual valve SD14, the filter GL10, the pressure reducing valve JF10, the pressure sensor Y13, the conducting valve K8, the gas flowmeter MFC6, the flame arrester ZH13 and the one-way valve DF6 in a third regulating and detecting gas path after being dried sequentially through an oil mist separator YL and a cold dryer LG, the static gas mixing device JH2, the mixing container HC2, the flame arrestor ZH14, the pressure sensor Y8 and the regulating valve ZK10 of the second group of gas mixing gas paths are used for outputting, the ZK19 and the gas analyzers in the second group of gas analysis pipelines are accessed through the opened regulating valves ZK12 and ZK15, the gas analyzers perform oxygen content analysis and then send the gas to the tank controller 13, the tank controller 13 simultaneously receives opening signals of the gas flow meters MFC4 and MFC6 and the regulating valves ZK10, ZK12 and ZK15, the tank controller 13 outputs control signals to the conducting valves K5 and K7 at the front end of the gas flow meter MFC to control the flow rate of single gas before each path is mixed, the manual valve SD8 at the output end of the hydrogen tank is opened after the mixed oxygen content of methane and air is reached, the conducting valve SD9, the manual valve SD11 and the filter GL5 of the flame arrestor SD11 in the second adjusting and detecting gas paths are sequentially opened under the control of the tank controller 13, and the hydrogen in the second adjusting and detecting gas paths, the pressure reducing valve JF5, the pressure sensor Y6, the conducting valve K6, the gas flowmeter MFC5, the flame arrester ZH12 and the one-way valve DF5 enter a second group of gas mixing gas paths to be mixed with the mixed gas prepared in the prior art, and the tank controller 13 controls and adjusts the conducting valve K6 at the front end of the gas flowmeter MFC5 to control the flow of hydrogen until the gas analyzer detects that the oxygen content reaches the concentration required by calculation, so that the gas distribution of the combustible gas is completed. ZK10, ZK12, ZK15, ZK19 are closed.
The gas used for gas distribution is generally stored in a high-pressure gas cylinder, and has great potential safety hazard in the transportation process as combustible gas, so that flame arresters are arranged at two ends of a regulating and detecting gas path, air is nonflammable gas, the safety factor is relatively high, the flame arresters are arranged only before entering mixing, the flame arresters are arranged after the combustible gas is mixed, and the mixing section is safely protected.
The gas analyzer 22 includes an oxygen meter tank controller 13 for converting the oxygen content in each process of the mixing scheme according to the configuration concentration and the ratio requirements between the various combustible gases, and then converting the oxygen content into flow, and sequentially controlling the configuration.
And in the second step, two explosion isolation test tanks carry out gas replacement simultaneously: there are two methods of gas displacement, one of which is optional.
1. And simultaneously carrying out gas replacement by a vacuum method:
the tank body input regulating valve group and the tank body output regulating valve group of the two explosion-proof test tanks are opened, the regulating valves ZK 12-ZK 16 and ZK5 communicated with the vacuum pump are opened, the other regulating valves are closed, the vacuum pump ZB is opened, the two explosion-proof test tanks are vacuumized, meanwhile, the pressure detection is carried out through the pressure sensor on the pipeline of the output regulating valve group, when the air pressure in the corresponding explosion-proof test tank is detected to be negative, the regulating valves ZK 13-ZK 16 and ZK5 on the channels of the corresponding explosion-proof test tank and the vacuum pump ZB are closed;
and (3) opening a regulating valve on a passage where the regulating valve ZK10 at the output end of the combustible gas mixture is communicated with the two explosion-proof test tanks, uniformly filling the combustible gas mixture into the two explosion-proof test tanks, and closing the regulating valves on the passages where all the output ends of the combustible gas mixture are communicated with the two explosion-proof test tanks when the combustible gas mixture in the explosion-proof test tanks is completely filled (the pressure reaches a set value).
As shown in fig. 2, the connecting regulating valve ZK12 between the input regulating valve group and the output regulating valve group of the two explosion-proof test tanks is opened, and after vacuumizing, the gas mixture can be used for inflating the explosion-proof test tanks from the input end and the output end, so that the inflation is uniform and quick.
2. And the gas replacement is carried out by a purging method:
and (3) opening a regulating valve ZK10 at the output end of the combustible gas mixture and all regulating valves on input and output passages of the two explosion-proof test tanks, simultaneously opening all passages (regulating valves ZK13, ZK15, ZK17 and ZK 18) between the two explosion-proof test tanks and the exhaust port 20 to form the combustible gas mixture to flow from left to right in the two explosion-proof test tanks, replacing gas in the two explosion-proof test tanks, opening a regulating valve ZK19, detecting the concentration of the gas blown out from the exhaust port through a gas analyzer 22, and closing all the regulating valves under the control of a tank body controller after the replacement is finished when the concentration reaches the concentration of the combustible gas mixture entering the explosion-proof test tanks.
And thirdly, performing explosion-proof test on the two explosion-proof test tanks at the same time:
the ignition is controlled by the tank controller 13, the explosion test is carried out on samples in the two explosion-proof test tanks through the ignition pressure measuring device 14 and the high-speed camera 18 for data acquisition, the pressure and the temperature in the tanks are monitored after explosion, the pressure waveform and the temperature change curve of the time period are obtained, and the judgment is carried out according to the test standard. The high-speed camera is arranged outside the explosion-proof test tank, and the flame propagation state during explosion is shot and collected through the observation window.
And in the last step, purging pipelines in the explosion-proof test tank and from the explosion-proof test tank to the exhaust port: and opening the SD14, K8, ZK11, ZK14, ZK16, ZK5 and two explosion-proof test tanks to input and output regulating valve groups, and blowing the sweeping tank body and all pipelines communicated at the back while vacuumizing compressed air.
The gas types required by the second testing subsystem are changed as follows, for example, methane is changed into acetylene, as long as the hydrogen and the air are mixed, after the oxygen content of the two gases is detected, SD10, K5, DF4, ZK10, ZK12, ZK15, ZK17, ZK18 and ZK19 on the pipeline of the vacuum pump from the acetylene adjusting detection gas circuit and the gas mixing gas circuit are opened, the gas is naturally passed through the pressure regulating gas circuit and the gas analyzing pipeline to be led to the exhaust port, and when the oxygen content detected by gas analysis reaches the actual requirement, the required configuration gas can be directly indicated to reach the requirement.
Gas distribution example: for example, a mixture of combustible gas and air is prepared at a concentration of 12.5%, wherein the ratio of methane to hydrogen in the combustible gas is 58:42, methane is mixed with air first, because the ratio of methane to air in the final mixture should be 12.5% 58%, then the air content should be (100% -12.5% 58%), and the measured oxygen content should be (100% -12.5% 58%) 20.95%, about 18.43%; (oxygen content in default air 20.95%); and mixing the prepared mixed gas with hydrogen, wherein only the change of an oxygen expression value is required to be observed, the flow of methane is not required to be regulated, and the mixing of the combustible gas is completed as long as the oxygen content reaches the standard. The oxygen content of the final mixture should be (100% -12.5%) 20.95%, about 18.33%.
The system has two explosion-proof test tanks, realizes an explosion-proof test design gas passage under one set of control system, is convenient for testing two samples simultaneously by the same combustible gas, and saves test time; the explosion-proof test tank is provided with a control system at least, so that the explosion-proof test tank is convenient to use independently, has small capacity and high configuration speed; and the multiple channels are in and out, so that various tested structures can be suitable for and simultaneously detected, the multiple channels are combined with various emission modes, various proper ventilation modes can be changed according to the requirements of various gases and sample structures, and the efficiency and the accuracy of the explosion-proof test of the system are ensured. In addition, the design of the pressure regulating device can regulate the pressure of the whole gas replacement, control the process speed of the gas replacement and ensure the replacement precision. The number of groups of input and output regulating valves of each explosion-proof test tank can be selected according to the structure and the size of the sample, and all the regulating valves are not required to be used each time. Pressure sensors are arranged on the output regulating valve group pipelines connected with the inner cavity of the sample and used for detecting the pressure of the output gas in the cavity, and the output regulating valve group pipelines connected with the explosion proof test tank only need to be provided with a group of pressure sensors on the pipelines so as to detect the output pressure of the tank, and the output pressure detection and the tank pressure detection are convenient to adjust.
The whole system is reasonably designed, various gas configurations can be facilitated, the gas delivery pipelines at the front end of the gas distribution are all the only gases, purging and replacement are not needed, and gas source waste is avoided. And the front end gas distribution and gas mixing of the explosion-proof test tank are properly designed, so that frequent blowing and replacement are avoided.
Claims (5)
1. The explosion-proof test system is characterized by comprising 5 explosion-proof test tanks, wherein the volume of the 5 explosion-proof test tanks is from small to large, the system is divided into 3 independent test subsystems, only one explosion-proof test tank with the smallest volume is arranged in the first test subsystem, and the second test subsystem and the third test subsystem comprise two explosion-proof test tanks which are connected in parallel;
each test subsystem comprises three groups of adjusting and detecting air circuits, a group of air mixing air circuits, a tank input adjusting valve group, a flameproof test tank, a tank output adjusting valve group, a group of pressure adjusting air circuits, a group of air analysis pipelines, a tank controller, an ignition pressure measuring device, a high-speed camera and a plurality of temperature and pressure sensors; the 3 independent test subsystems share a vacuum pump and various gas tanks for containing gas, methane, propane, ethylene and acetylene are filled as a first group of gas tanks, hydrogen and nitrogen are filled as a second group of gas tanks, oxygen and compressed air are filled as a third group of gas tanks, the output end of each gas tank is connected with a manual valve, each gas tank of the gas is corresponding to a unique gas pipeline, the front end of the gas in the first group of gas tanks, which enters the first group of adjusting and detecting gas paths, is corresponding to each gas pipeline, is connected with a controllable conducting valve, the front end of the gas in the second group of gas tanks, which enters the second group of adjusting and detecting gas paths, is also connected with a controllable conducting valve, and the gas in the third group of gas tanks directly enters the third group of adjusting and detecting gas paths; every three groups of adjusting and detecting gas paths output gas and are led into a gas mixing gas path, the gas mixing gas path output gas is detected through a gas analysis pipeline, and the gas mixing gas path output end is connected with each explosion-proof test tank through a tank body input adjusting valve group and a tank body output adjusting valve group;
the two sides of each explosion-proof test tank are symmetrically provided with a plurality of groups of tank body input regulating valve groups, tank body output regulating valve groups and inlet and outlet pipelines of the explosion-proof test tank, the inlet and outlet pipelines of each explosion-proof test tank are connected with an exhaust port through a group of pressure regulating gas circuits corresponding to the test subsystem, the inlet and outlet pipelines of each explosion-proof test tank are connected with the exhaust port through a group of gas analysis pipelines corresponding to the test subsystem, and the inlet and outlet pipelines of each explosion-proof test tank are connected with the exhaust port through a shared vacuum pump;
the gas mixing gas circuit sequentially comprises a static gas mixing device, a mixing container, a third flame arrester, a gas mixing gas circuit pressure sensor and a regulating valve; the regulating valve at the tail end of the gas mixing gas circuit divides the output of the gas mixing gas circuit into three paths, one path is communicated with the tank input regulating valve group and the tank output regulating valve group of the tank controller, the other path is connected with the exhaust port through the pressure regulating gas circuit, and the other path is connected with the exhaust port through the gas analysis pipeline; the pressure regulating valve is connected in series with one regulating valve and then connected with the other regulating valve in parallel to form a pressure regulating air path; the regulating valve is connected in series with the gas analyzer to form a gas analysis pipeline;
the pressure detected by pressure sensors on the outlet pipelines of the detection gas circuit, the three groups of gas mixing gas circuits and each explosion-proof test tank, the temperature detected by temperature sensors in each explosion-proof test tank and oxygen content data detected by each group of gas analysis pipelines are regulated, the flame propagation state in the explosion-proof test tank shot through an observation window of the explosion-proof test tank is shot at a high speed, and image data are sent to a corresponding tank controller, and the tank controller outputs control signals to a conduction valve, a regulating valve and an ignition pressure measuring device to realize the test.
2. The flameproof test system according to claim 1, wherein the adjustment detection gas paths corresponding to methane, propane, ethylene, acetylene, hydrogen, nitrogen and oxygen are the same, and each of the adjustment detection gas paths comprises a first flame arrester, a manual valve, a filter, a pressure reducing valve, a pressure sensor, a conduction valve, a gas flowmeter, a second flame arrester and a one-way valve in sequence; the device comprises an oil mist separator, a cold dryer, a manual valve, a compressed air filter, a compressed air pressure reducing valve, a compressed air sensor, a compressed air conducting valve, a non-combustible gas distribution flow meter, a non-combustible gas distribution flame arrester and a non-combustible gas distribution one-way valve, wherein oxygen and compressed air are used as the non-combustible gas distribution gas, the adjustment and detection gas paths of the oxygen and the compressed air are partially shared, the compressed air firstly passes through the oil mist separator and the cold dryer after entering the adjustment and detection gas paths, is ensured to be output through the manual valve, and then sequentially passes through the compressed air filter, the compressed air reducing valve, the compressed air pressure sensor, the compressed air conducting valve, the non-combustible gas distribution flow meter, the non-combustible gas distribution flame arrester and the non-combustible gas distribution one-way valve and then enters the gas mixing gas paths, and the non-combustible gas distribution one-way valve.
3. The method for testing the explosion-proof testing system according to claim 2, wherein the second testing subsystem testing method specifically comprises the following steps:
and (3) distributing gas in the first step: opening a manual valve at the output end of one gas in the first combustible gas and the third group of gas tanks, opening two groups of adjusting and detecting gas paths, one group of gas mixing gas paths and one group of gas analysis pipelines corresponding to the gas tanks in a test subsystem corresponding to the explosion-proof test tank of the sample to be tested, and closing other pipelines;
the method comprises the steps that a tank body controller in a test subsystem receives opening signals of a gas flowmeter in two groups of adjusting and detecting gas paths, an opened gas mixing gas path and an adjusting valve in a gas analysis pipeline simultaneously, the tank body controller outputs control signals to a conducting valve at the front end of the two gas flowmeters to control the flow of single gas before mixing each path, after the mixed oxygen content of the two gases is achieved, if a third gas is needed to be mixed, a manual valve at the output end of the third gas tank is opened, under the control of the tank body controller, the conducting valve at the front end of the third gas adjusting and detecting gas path is opened, the tank body controller controls the conducting valve at the front end of the gas flowmeter in the adjusting and detecting gas path to control the third gas flow until the gas analyzer detects that the oxygen content reaches the required concentration obtained by calculation, and the gas distribution of combustible gas is completed; closing a regulating valve at the tail end of the gas mixing gas circuit;
and a second step of performing gas replacement on the explosion isolation test tank: gas displacement is carried out by one of two methods, the following one of which is optional;
1) And (3) carrying out gas replacement by a vacuum method:
all tank body input regulating valve groups and tank body output regulating valve groups corresponding to the explosion-proof test tanks with samples to be tested are opened, all regulating valves communicated with the vacuum pump are opened, other regulating valves are closed, the vacuum pump is opened, the explosion-proof test tanks are vacuumized, meanwhile, pressure detection is carried out through a pressure sensor on an outlet pipeline of the explosion-proof test tanks, and when the fact that the air pressure in the corresponding explosion-proof test tanks is negative is detected, the regulating valves on the connecting pipelines of the corresponding explosion-proof test tanks and the vacuum pump are closed;
opening a regulating valve at the output end of the flammable gas mixture and regulating valves on inlet and outlet pipelines of the detonating test tanks with the samples to be tested, uniformly filling the flammable gas mixture into the two detonating test tanks, and closing regulating valves on the inlet and outlet pipelines of all the detonating test tanks with the flammable gas mixture output ends communicated with the detonating test tanks when the flammable gas mixture in the detonating test tanks is completely filled and the pressure reaches a set value;
2) And the gas replacement is carried out by a purging method:
opening a regulating valve at the output end of the flammable gas mixture and regulating valves on an inlet pipeline and an outlet pipeline of a detonating test tank with a sample to be tested, simultaneously opening all ventilation pipelines between the detonating test tank and an exhaust port, forming the flow of the flammable gas mixture left and right in the two detonating test tanks, displacing the gas in the detonating test tanks, detecting the concentration of the gas blown out of the exhaust port, and if the concentration reaches the concentration of the flammable gas mixture entering the detonating test tanks, indicating that the displacement is completed, and closing all regulating valves under the control of a tank controller;
and thirdly, performing explosion suppression test:
igniting under the control of a tank controller, performing explosion test on samples in two explosion-proof test tanks through an ignition pressure measuring device and a high-speed camera to acquire data, monitoring the pressure and the temperature in the tank after explosion to obtain a pressure waveform and a temperature change curve in a time period, and judging according to a test standard; the high-speed camera is arranged outside the explosion-proof test tank, and the flame propagation state during explosion is shot and collected through the observation window;
fourth, purging the ventilation pipeline from the explosion-proof test tank to the exhaust port: opening a ventilation pipeline from the compressed air to the explosion-proof test tank to the vacuum pump, and blowing the compressed air to the ventilation pipeline communicated with all explosion-proof test tanks to the exhaust port while vacuumizing through the vacuum pump;
the third test subsystem test method is the same as the second test subsystem test method.
4. The method for testing a flame-proof test system according to claim 3, wherein when the combustible gas required for testing the two samples is the same, the two samples are respectively placed into two flame-proof test tanks in the second or third test subsystem, one gas distribution, gas replacement and flame-proof test are sequentially performed on the two flame-proof test tanks at the same time, and purging is performed on the vent pipeline from the tank body and the flame-proof test tank to the vent port on the two flame-proof test tanks at the same time.
5. The method according to claim 3, wherein when the combustible gas required for testing the two samples is different, the two samples are respectively placed into one explosion-proof test tank in the second and third test subsystems, two gas distribution is sequentially performed simultaneously, two explosion-proof test tanks are simultaneously subjected to gas replacement, two explosion-proof test tanks are simultaneously subjected to explosion-proof test, and two explosion-proof test tanks are simultaneously subjected to tank body purging and the vent pipeline from the explosion-proof test tank to the vent is purged.
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