This standard specifies the safety level of combustible gas allowed in coal mines, test materials, instruments, devices, test conditions, test steps, test result presentation and judgment, etc. This standard is applicable to the test of combustible gas safety of explosives allowed in coal mines. GB 18097-2000 Test method and judgment of combustible gas safety of explosives allowed in coal mines GB18097-2000 standard download decompression password: www.bzxz.net

GB18097--2000
This standard is formulated on the basis of MT61-1997 "Test Method and Judgment Rules for Safety of Underground Combustible Gas of Permissible Explosives in Coal Mines", with reference to WJ1978-1990 "Test Method for Safety of Biogas of Permissible Explosives in Coal Mines", and in accordance with the requirements of GB/T1 series standards. This standard is proposed by the National Defense Science, Technology and Industry Commission. This standard is under the jurisdiction of China Ordnance Industry Standardization Research Institute. The drafting units of this standard are: National Coal Mine Explosion-proof Safety Product Quality Supervision and Inspection Center, National Civilian Explosives Quality Supervision and Inspection Center, Coal Industry Zhunbei Explosives Product Quality Supervision and Inspection Center, National Civilian Explosives Product Changsha Quality Supervision and Inspection Station, China Ordnance Industry Standardization Research Institute.
The main drafters of this standard are: Zheng Fuliang, Wang Zhimin, Dong Chunhai, Xia Bin, Li Jianxiang, Yang Jinxia, ​​Yu Lizhi. 8153
1 Scope
National Standard of the People's Republic of China
Test method and adjudgment of safety of permissible explosive in inflammable gas in coal mines
Test method and adjudgment of safety of permissible explosive in inflammable gas GB 18097— 2000
This standard specifies the safety level of permissible explosive in inflammable gas in coal mines, test materials, instruments, devices, test conditions, test procedures, expression and adjudgment of test results, etc.
This standard is applicable to the test of safety of permissible explosive in inflammable gas in coal mines. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T8031---1987 Industrial electric detonator
3 Definitions and symbols
3.1 Definitions
This standard adopts the following definitions.
3.1.1 Permissible explosive in coal mines Explosives permitted to be used in coal mines where there is a risk of explosion of combustible gases or coal dust. 3.1.2 Inflammable gas; Combustible gas Gas that can burn or explode after mixing with air. 3.1.3 Safety safety
The degree of safety of explosives used in coal mines where there is a risk of explosion of combustible gases or coal dust 3.1.4 Half ignition sample mean
The mass of explosives with a probability of ignition of 50% under specified conditions. 3.1.5 Interval
The absolute value of the difference between two adjacent test levels. 3.1.6 Small sample up-and-down method A test method for finding the mean value of a single-factor random variable with a sample size of no more than 6. 3.2 Symbols
a) Mso: half ignition quantity, g;
b) m5: half ignition quantity standard value, g; c); sample size;
d) d: ladder distance, g;
Approved by the State Administration of Quality and Technical Supervision on May 9, 2000, s
Implemented on July 1, 2000
e) i: test level sequence number, integer; f) Mo: initial test level, g;
g) M: i-th test level, g;
h) k,: number of tests at the M, test level. 4 Safety level of combustible gases permitted for coal mines GB 18097-2000
The safety level of combustible gases permitted for coal mines is divided into Level I, II and III. The standard values ​​of half-ignition quantity (ms) of each level are shown in Table 1. Table 1 Safety level of combustible gas of permissible explosives in coal mines Level
mtso·g
Test method
Applicable range
5 Test method
5.1 Summary of method
Firing self-cannon
Low methane mine rock excavation
Working face
Firing white cannon
Firing mortar
Low methane mine coal seam mining "High methane mine; Low methane mine high methane mining working face
Face; Coal and oil symbiotic mine: Coal and coal seam gas outburst mine Under specified conditions, the small sample lifting method is used to place the tested explosive in the firing white cannon blast hole. According to the ignition results of the combustible gas-air mixture in the test tunnel, the half ignition amount is calculated to determine the combustible gas safety of the explosive. 5.2 Test design
|a) Sample size: n=6;
b) Ladder spacing: d=50g;
c) Initial test level: M,=m5o+d; d) Lifting and lowering rules: The test is ignited at the M level, and the next test level is reduced by one ladder spacing d; otherwise, one ladder spacing d is increased. It is not allowed to skip ladder spacing or keep the test level unchanged.
5.3 Materials
5.3.1 Test gas: The volume fraction of methane should not be less than 90%, and the sum of the volume fractions of other combustible gases should not be greater than 1%. 5.3.2 Detonator: GB/T8031, instantaneous electric detonators allowed in coal mines. 5.4 Instruments and devices
5.4.1 Instrumentsbzxz.net
a) Methane meter: The graduation value should not be greater than 0.02%; b) Thermometer: The graduation value should not be greater than 1°C; c) Hygrometer: The graduation value should not be greater than 5%; d ) Balance: The sensitivity should not exceed 1g.
5.4.2 Device
The combustible gas safety test device is mainly composed of a test tunnel, a gas mixing pipeline, a white cannon, a mixing fan, a smoke exhaust fan and a control system, as shown in Figure 1.
a) The test tunnel is a steel cylinder, which is divided into an explosion chamber and an extension chamber. It is placed horizontally with an inner diameter of 1.8m and an explosion chamber length of 5m. There is a circular opening in the center of the closed end of the explosion chamber, and a closing device is provided at the open end. The extension chamber is 15m long and is connected to the mouth of the explosion chamber; b) The gas mixing pipeline consists of an air intake pipe, an air return pipe and a valve. The air intake pipe is introduced from the upper part of the closed end of the explosion chamber, and the air return pipe is led out from the lower part of the open end of the explosion chamber. Valves should be installed on the air intake pipe and the air return pipe respectively; c) The white cannon is a steel cylinder, which consists of an inner tube and an outer sleeve. . Its inner cylinder is protruding, covered with a sealing rubber pad, and a blast hole is opened in the central axis. Its structure diagram is shown in Figure 2;
GB18097-2000
d) Mixing fan and smoke exhaust fan should be explosion-proof. 1
1-Test tunnel; 2-Extension chamber 3-Enclosing device, 4-Explosion chamber: 5-Measuring hole; 6-Firing white gun; 7-Smoke exhaust fan; 8-Smoke exhaust pipe; 9-Intake pipe; 10-Mixing fan: 11-Return air pipe; 12-Intake pipe for combustible gas: 13-Valve Figure 1 Schematic diagram of combustible gas safety test device 2
5.5 Test conditions
900±1
1-Boss; 2-Sealing rubber pad; 3-Inner shell; 4-Outer shell Figure 2 Structure diagram of firing white gun
5.5.1 The sample is made of explosive original medicine roll, and the medicine temperature should be 5℃～35C. 6
5.5.2 The volume fraction of methane in the mixed gas in the explosion chamber should be 9.0% ± 0.3%, the temperature should be 5℃～35℃, and the relative humidity should not be greater than 80%.
5.5.3 The hole expansion rate of the white cannon should not exceed 25%. 5.6 Test steps
5.6.1 Before each test, the air tightness of the methane detector should be checked and the zero point should be calibrated. 5.6.2 Seal the mouth of the explosion chamber with kraft paper or plastic film. 5.6.3 Determine the mass of the sample according to 5.2. When weighing the sample, the mass of the sample includes the mass of the outer packaging. 5.6.4 Insert the detonator into one end of the sample. The insertion depth should not be less than 2/3 of the length of the detonator. Use the reverse detonation method and use a wooden cannon stick to load the sample into the bottom of the cannon hole for launching the white cannon.
5.6.5 Push the firing cannon to the closed end of the explosion chamber and press it tightly, so that the boss enters the circular opening of the closed end, and its end face is flush with the inner wall of the closed end. 5.6.6 Turn on the mixing fan, fill the explosion chamber with test gas, and measure the temperature, relative humidity and methane concentration of the mixed gas. 818
GB18097—2000
5.6.7 When the gas in the explosion chamber is evenly mixed and the methane content reaches the requirement, stop charging, close the mixing fan and related valves, and open the pressure relief valve at the same time.
5.6.8 Connect the detonation circuit and detonate within 2 minutes after closing the mixing fan. 5.6.9 Check whether the tested explosive is fully exploded. If it is not exploded or partially exploded, this test is invalid and the horizontal test is repeated. 5.6.10 Observe whether the mixed gas ignites and record it. 5.6.11 Turn on the smoke exhaust fan and the mixed fan air inlet valve at the same time, turn on the mixed fan to exhaust the blasting smoke in the tunnel. The exhaust time should be no less than 3 minutes.
5.6.12 Reset each valve to the initial state of the test. 5.7 Expression of test results
5.7.1 Test record
The test results shall be recorded in the format of the example in Table 2. "Ignition" is recorded as "1" and "no ignition" is recorded as "0". Table 2 Test record of small sample lifting method
Test results
Note: "1" in the table means that the results of the first two tests are the same, and the first test result should be discarded when calculating the half ignition amount. The "X" of the 7th test level is virtualized based on the result of the 6th test, that is, if the 6th test is "ignited", then one step is lowered, otherwise one step is raised. 5.7.2 Data processing
Take the results of 6 consecutive tests in the test sequence starting from the opposite test results, and virtualize the 7th test result. Calculate the half ignition base according to the following formula, and round the final result to the unit digit. Ms. = Ek,M./7
6 Determination of test results
6.1 If Mso≥ms0, the sample is judged to be qualified for safety. 6.2 If m5u-Ms≥40g, the sample is judged to be unqualified for safety. Otherwise, according to the result of the 6th test, continue to do 6 tests, and then simulate the result of the 13th test to calculate the half ignition amount of the 13th test level. If M5≥m50, the sample is still judged to be qualified for safety; otherwise, it is judged to be unqualified.
6.3 If the test level rises to m5+3d and still does not ignite, stop the test, and take M5>m5 (half ignition amount of the corresponding safety level) as the test result to judge that the sample is qualified for safety. 819
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