CN109668930B - Method for testing minimum ignition energy of gas-solid two-phase combustible material - Google Patents
Method for testing minimum ignition energy of gas-solid two-phase combustible material Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 56
- 239000007787 solid Substances 0.000 title claims abstract description 28
- 239000000463 material Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000010892 electric spark Methods 0.000 claims abstract description 16
- 239000000428 dust Substances 0.000 claims description 34
- 239000012071 phase Substances 0.000 claims description 29
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 13
- 239000005977 Ethylene Substances 0.000 claims description 13
- 239000004698 Polyethylene Substances 0.000 claims description 9
- -1 polyethylene Polymers 0.000 claims description 9
- 229920000573 polyethylene Polymers 0.000 claims description 9
- 238000002474 experimental method Methods 0.000 claims description 5
- 239000007790 solid phase Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims 1
- 238000004880 explosion Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920002994 synthetic fiber Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012644 addition polymerization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 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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Abstract
The invention relates to a method for testing minimum ignition energy of gas-solid two-phase combustible materials, which mainly solves the problem that no method for testing the minimum ignition energy of the gas-solid two-phase combustible materials exists in the prior art. The invention adopts a method for testing the minimum ignition energy of gas-solid two-phase combustible materials, adopts a minimum ignition energy testing device to test the minimum ignition energy of the gas-solid two-phase combustible materials, the main body of the device is a spherical testing cavity, a vacuum pump and a buffer tank are connected on the cavity, an ignition electrode is arranged on a flange at the upper side of the cavity, one end of a precision electric spark generator is connected with the ignition electrode, and the other end of the precision electric spark generator is connected with a computer, thereby better solving the problems.
Description
Technical Field
The invention relates to a method for testing minimum ignition energy of gas-solid two-phase combustible materials. The invention is mainly applied to the field of production and storage of plastic, rubber and synthetic fiber which are three major synthetic materials, and aims to prevent fire explosion under the synergistic action of a gas-solid two-phase system in the production and storage processes.
Background
In the production process of the three synthetic materials, micromolecular raw materials such as ethylene and butylene are subjected to addition polymerization to obtain a high polymer product, the micromolecular raw materials are all in a gaseous state, the high polymer product is in a solid state, when the concentrations of the gaseous material and the solid material are lower than the lower explosion limit, a single component cannot be subjected to explosion accidents, but the mixture of the gaseous material and the solid material has the risk of explosion.
The minimum ignition energy of the mixed substances is related to the minimum ignition energy of the solid substances, the minimum ignition energy and concentration of combustible gas and the sensitive concentration of gas explosion, and researches show that a corresponding testing device is provided for the minimum ignition energy of a single phase state at present, and a testing device and a testing method are not provided for the minimum ignition energy of a gas phase and a solid phase.
Disclosure of Invention
The invention aims to solve the technical problem that a method for testing the minimum ignition energy of gas-solid two-phase combustible materials in the prior art is not available, and provides a novel method for testing the minimum ignition energy of the gas-solid two-phase combustible materials. The method has the advantages of simple operation and good repeatability.
In order to solve the problems, the technical scheme adopted by the invention is as follows: a method for testing the minimum ignition energy of gas-solid two-phase combustible materials adopts a minimum ignition energy testing device to test the minimum ignition energy of the gas-solid two-phase combustible materials, the main body of the device is a spherical testing cavity, a vacuum pump and a buffer tank are connected on the cavity, an ignition electrode is arranged on a flange on the upper side of the cavity, one end of a precision electric spark generator is connected with the ignition electrode, and the other end of the precision electric spark generator is connected with a computer; when in test, the method comprises the following steps: (1) preparing combustible gas and air into mixed gas according to a working condition ratio, and enabling the mixed gas to enter a mixer; (2) placing combustible dust on a dust lifter, starting a vacuum pump, vacuumizing a test cavity, enabling part of mixed gas in a mixer to enter the cavity, enabling the other part of mixed gas to enter a high-pressure gas storage tank, and enabling gas in the high-pressure gas storage tank to blow all the dust on the dust lifter to form turbulent flow; (3) adjusting the energy of a precise electric spark generator, controlling ignition by a computer after raising dust, and recording the ignition condition through an observation window; (4) after the test cavity is cleaned, the ignition energy is adjusted according to the ignition condition, and the experiment is repeated to obtain the minimum ignition energy for burning and exploding the dust under the condition of combustible gas with certain gas phase concentration.
In the above technical solution, preferably, the test chamber has a vacuum gauge thereon.
In the above technical solution, preferably, the sum of the amount of gas entering the cavity and the amount of gas entering the high-pressure gas storage tank just maintains the cavity at normal pressure.
In the above technical solution, preferably, the mixer is provided with a stirring device.
In the above technical scheme, preferably, the gas in the high-pressure gas storage tank is connected with the dust blower after passing through the electromagnetic valve, and the dust blower is located in the cavity.
In the above technical solution, preferably, the observation window is located at one side of the cavity.
In the above technical solution, preferably, the precision electric spark generator is connected to an ignition electrode, and the ignition electrode is located in the cavity.
Among the above-mentioned technical scheme, preferably, high pressure gas holder is equipped with the manometer.
Among the above-mentioned technical scheme, preferably, the vacuum pump export links to each other with the buffer tank, and the buffer tank links to each other with the test cavity.
In the above technical solution, preferably, the electromagnetic valve is connected to a control computer.
The device can test the minimum ignition energy after mixing gas-solid two-phase combustible materials, effectively fills the defects of the existing test means, has the advantages of simple operation and good repeatability, and obtains better technical effect.
Drawings
FIG. 1 is a schematic flow diagram of the apparatus of the present invention.
In FIG. 1, a vacuum pump; 2. a buffer tank; 3A, a vacuum gauge; 3B, a pressure gauge 4 and an ignition electrode; 5. a precision electric spark generator; 6. a computer; 7. a test chamber; 8. a dust ejector; 9. an electromagnetic valve; 10 high pressure gas inlet tank; 11 a mixer; 12. a combustible gas cylinder; 13. an air cylinder; 14 a mixed gas inlet cavity pipeline; 15. and (4) an observation window.
The present invention will be further illustrated by the following examples, but is not limited to these examples.
Detailed Description
[ example 1 ]
A method for testing the minimum ignition energy of a gas-solid two-phase combustible material adopts a minimum ignition energy testing device (shown in figure 1) to test the minimum ignition energy of the gas-solid two-phase combustible material, wherein the main body of the device is a spherical testing cavity, a vacuum pump and a buffer tank are connected on the cavity, an ignition electrode is arranged on a flange on the upper side of the cavity, one end of a precise electric spark generator is connected with the ignition electrode, and the other end of the precise electric spark generator is connected with a computer; when in test, the method comprises the following steps: (1) preparing a combustible gas steel cylinder and an air steel cylinder into mixed gas according to a working condition ratio, and feeding the mixed gas into a mixer; (2) placing combustible dust on a dust lifter, starting a vacuum pump, vacuumizing a test cavity, enabling part of mixed gas in a mixer to enter the cavity, enabling the other part of mixed gas to enter a high-pressure gas storage tank, and enabling gas in the high-pressure gas storage tank to blow all the dust on the dust lifter to form turbulent flow; (3) adjusting the energy of a precise electric spark generator, controlling ignition by a computer after raising dust, and recording the ignition condition through an observation window; (4) after the test cavity is cleaned, the ignition energy is adjusted according to the ignition condition, and the experiment is repeated to obtain the minimum ignition energy for burning and exploding the dust under the condition of combustible gas with certain gas phase concentration.
The test cavity is provided with a vacuum meter. The sum of the gas quantity entering the cavity and the gas quantity entering the high-pressure gas storage tank just maintains the cavity to be at normal pressure. The mixer is provided with a stirring device. The gas in the high-pressure gas storage tank is connected with the dust raising device through the electromagnetic valve, and the dust raising device is positioned in the cavity. The observation window is positioned at one side of the cavity. The precise electric spark generator is connected with an ignition electrode, and the ignition electrode is positioned in the cavity. The high-pressure gas storage tank is provided with a pressure gauge. The outlet of the vacuum pump is connected with the buffer tank, and the buffer tank is connected with the testing cavity. The electromagnetic valve is connected with a control computer.
The method of the invention is adopted to test the minimum ignition energy of polyethylene (solid phase) and ethylene (gas phase).
The content of ethylene in a polyethylene bin is 1 percent, and the concentration of dust is 30-100 g/m3And testing to obtain the minimum ignition energy of the two-phase system without fire explosion, thereby guiding the static prevention and control work.
The operation method comprises the following steps:
1. the mixed gas with the concentration of 1% is prepared by the ethylene steel cylinder and the air steel cylinder according to the working condition proportion and then enters a mixer to be uniformly stirred for standby.
2. According to 30g/m3The quantitative polyethylene dust is put on a dust lifter. Starting the vacuum pump, vacuumizing the test cavity, and placing in a mixerPart of the mixed gas enters a cavity through a pipeline, the other part of the mixed gas enters a high-pressure gas storage tank, the cavity is at normal pressure, and meanwhile, the high-pressure gas storage tank can completely blow up dust on the dust raising device when passing through an electromagnetic valve and forms proper turbulence.
3. And adjusting the energy of the precise electric spark generator, controlling ignition by a computer after dust is blown for 60ms, and recording the ignition condition through an observation window.
4. After the test cavity is cleaned, the ignition energy is adjusted according to the ignition condition, and the experiment is repeated to obtain 30g/m combustible gas with the ethylene concentration of 1 percent3Minimum ignition energy for polyethylene dust to explode.
5. Increasing the concentration of the polyethylene dust, and repeating the steps 1-4 to obtain the minimum ignition energy for burning and explosion under the conditions of combustible gas with 1% of ethylene concentration and polyethylene dust with different concentrations. Table 1 is a comparison of the results of several sets of experiments:
TABLE 1 Effect of different ethylene concentrations on minimum ignition energy of the blends
Note: the minimum ignition energy of ethylene is literature value, and the rest results are experimental values
According to the experimental results, after the polyethylene powder is mixed with the ethylene gas, the minimum ignition energy of the mixed system is lower than that of the polyethylene powder and higher than that of the ethylene; the ignition energy of the mixed system is obviously reduced along with the increase of the content of the ethylene gas, and the ignition energy is reduced by about half when the content of the ethylene gas reaches 1 percent.
Claims (10)
1. A minimum ignition energy test method for gas-solid two-phase combustible materials is characterized in that a minimum ignition energy test device is adopted to test the minimum ignition energy of the gas-solid two-phase combustible materials, wherein a gas phase is ethylene, a solid phase is polyethylene, a main body of the device is a spherical test cavity, a vacuum pump and a buffer tank are connected to the cavity, an ignition electrode is installed on a flange on the upper side of the cavity, one end of a precise electric spark generator is connected with the ignition electrode, and the other end of the precise electric spark generator is connected with a computer; when in test, the method comprises the following steps: (1) preparing combustible gas and air into mixed gas according to a working condition ratio, and enabling the mixed gas to enter a mixer; (2) placing combustible dust on a dust lifter, starting a vacuum pump, vacuumizing a test cavity, enabling part of mixed gas in a mixer to enter the cavity, enabling the other part of mixed gas to enter a high-pressure gas storage tank, and enabling gas in the high-pressure gas storage tank to blow all the dust on the dust lifter to form turbulent flow; (3) adjusting the energy of a precise electric spark generator, controlling ignition by a computer after raising dust, and recording the ignition condition through an observation window; (4) after the test cavity is cleaned, the ignition energy is adjusted according to the ignition condition, and the experiment is repeated to obtain the minimum ignition energy for burning and exploding the dust under the condition of combustible gas with certain gas phase concentration.
2. The method for testing the minimum ignition energy of a gas-solid two-phase combustible material as claimed in claim 1, wherein a vacuum gauge is arranged on the testing chamber.
3. The method for testing the minimum ignition energy of a gas-solid two-phase combustible material as claimed in claim 1, wherein the sum of the amount of gas entering the chamber and the amount of gas entering the high-pressure gas storage tank just keeps the chamber at normal pressure.
4. The method for testing the minimum ignition energy of a gas-solid two-phase combustible material as claimed in claim 1, wherein the mixer is provided with a stirring device.
5. The method for testing the minimum ignition energy of a gas-solid two-phase combustible material as claimed in claim 1, wherein the gas in the high pressure gas storage tank is connected with a dust blower through a solenoid valve, and the dust blower is located in the cavity.
6. The method for testing the minimum ignition energy of a gas-solid two-phase combustible material as claimed in claim 1, wherein the observation window is positioned at one side of the cavity.
7. The method for testing the minimum ignition energy of a gas-solid two-phase combustible material as recited in claim 1, wherein the precision electric spark generator is connected to an ignition electrode, the ignition electrode being located within the chamber.
8. The method for testing the minimum ignition energy of a gas-solid two-phase combustible material as claimed in claim 1, wherein the high pressure gas tank is provided with a pressure gauge.
9. The method for testing the minimum ignition energy of a gas-solid two-phase combustible material as recited in claim 1, wherein the outlet of the vacuum pump is connected with a buffer tank, and the buffer tank is connected with the testing chamber.
10. The method for testing the minimum ignition energy of a gas-solid two-phase combustible material as claimed in claim 5, wherein the solenoid valve is connected to a control computer.
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| CN201710965479.6A CN109668930B (en) | 2017-10-17 | 2017-10-17 | Method for testing minimum ignition energy of gas-solid two-phase combustible material |
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| CN201710965479.6A CN109668930B (en) | 2017-10-17 | 2017-10-17 | Method for testing minimum ignition energy of gas-solid two-phase combustible material |
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| CN110297012B (en) * | 2019-06-24 | 2020-11-27 | 北京理工大学 | System and method for detecting diffusion dynamic deflagration temperature of combustible dust cloud cluster |
| CN116297674B (en) * | 2022-09-09 | 2023-10-10 | 冰轮环境技术股份有限公司 | System and method for simulating and calculating minimum ignition energy of combustible explosive working medium |
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| KR20020004015A (en) * | 2000-06-27 | 2002-01-16 | 이동훈 | Measuring System for Minimum Ignition Energy of Flammable Powder |
| CN101692081A (en) * | 2009-09-28 | 2010-04-07 | 中国石油化工股份有限公司 | Device for testing minimum ignition energy of combustible gas or vapor |
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| JP2010203987A (en) * | 2009-03-05 | 2010-09-16 | Sumitomo Chemical Co Ltd | Method of determining ignition delay time in measurement of minimum ignition energy of dust |
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Effective date of registration: 20220525 Address after: No.218, Yan'an Third Road, Shinan District, Qingdao City, Shandong Province 266101 Applicant after: CHINA PETROLEUM & CHEMICAL Corp. Applicant after: Sinopec Safety Engineering Research Institute Co.,Ltd. Address before: Yanan City, Shandong province Qingdao City three road 266071 No. 218 Applicant before: CHINA PETROLEUM & CHEMICAL Corp. Applicant before: Qingdao Safety Engineering Research Institute of Sinopec |
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