Safety evaluation method for energy storage type metal coupling electromagnetic wave energy

Abstract

The invention discloses a safety evaluation method for energy storage type metal coupling electromagnetic wave energy. The method comprises the following steps: measuring related parameters of coal mine wireless communication equipment, related parameters of electromagnetic waves and related parameters of energy storage type metal; energy storage element parameters are estimated according to the energy storage type metal structure parameters; the discharge spark energy is calculated according to a calculation formula provided by the invention; according to the safety criterion of the coupling electromagnetic wave energy of the underground metal equipment, whether danger exists in the current situation or not is judged, and if danger exists, the safety reference distance between the coal mine wireless communication equipment and the energy storage type metal and the output power of the coal mine wireless communication equipment are given.

Description

Technical field:

[0001] The present application relates to the field of prevention and treatment of coal mine gas explosions, in particular to a method for evaluating the energy safety of coal mine energy storage metal coupled electromagnetic waves. Background technology:

[0002] Coal resources are the basic energy for my country's industrial development. As the world's largest coal producer and consumer, coal accounts for more than 50% of China's primary energy consumption. The intelligent upgrade of the coal industry is not only the key to promoting the sustainable development of the industry, but also an important means to improve overall energy efficiency and reduce environmental impact.

[0003] In the intelligent transformation of the coal industry, 5G wireless communication technology is applied to many aspects such as real-time monitoring of underground environment, establishment of emergency communication system, and personnel positioning and tracking. The electromagnetic wave energy emitted by wireless communication equipment will be coupled by the surrounding metal structure, generating induced voltage at the end of the metal structure, and under certain conditions, discharge sparks will be generated. There are explosive gases such as gas in coal mines. If the energy of the discharge spark is greater than the minimum ignition energy of explosive gases such as gas, it will cause an explosion of the explosive gas.

[0004] At present, the methods used in the research on the safety of electromagnetic wave energy coupled to metal structures are basically the metal structure equivalent resistive circuit evaluation method, but the metal structure equivalent resistive circuit cannot reflect the metal structure energy storage process, and ignores the accumulation process of electromagnetic waves in time. The actual process of electromagnetic wave energy coupled to metal structures in mines should be a process of metal structure coupling-accumulation-release of electromagnetic wave energy. Moreover, it is difficult for the metal structure equivalent circuit energy storage structure to form a purely inductive or purely capacitive energy storage structure. It is more of a complex energy storage structure in which equivalent resistance, equivalent inductance, and equivalent capacitance interact with each other. This application proposes a safety evaluation method for energy storage-type metal coupled electromagnetic wave energy, which fills the gap in the field of energy storage-type metal coupled explosive gas safety. Summary of the invention:

[0005] In order to solve the problems in the above-mentioned background technology, the present application provides a safety evaluation method for energy storage type metal coupling electromagnetic wave energy.

[0006] The present application provides a method for safety assessment of energy storage type metal coupling electromagnetic wave energy, comprising:

[0007] Step 1: Measure the parameters related to coal mine wireless communication equipment, electromagnetic wave and energy storage metal;

[0008] Step 2: Calculate the energy storage element parameters based on the energy storage metal parameters;

[0009] Step 3: Based on the coal mine wireless communication equipment related parameters, the electromagnetic wave related parameters, and the energy storage element parameters, the discharge spark energy is determined according to the energy storage type metal discharge spark energy calculation formula;

[0010] Step 4: Based on the discharge spark energy, the safety criterion of coal mine energy storage type metal coupling electromagnetic wave energy is adopted.

[0011] Determine whether the current situation is dangerous.

[0012] Optionally, according to the safety evaluation method described in the embodiment of the present application, the safety evaluation method is applicable to the case where the environment in which the energy storage type metal is located is a flammable and explosive environment in which gas exists in a coal mine tunnel, and the energy storage type metal is a hybrid energy storage type metal structure.

[0013] Optionally, according to the safety assessment method described in the embodiment of the present application, the coal mine wireless communication equipment related parameters include: coal mine wireless communication equipment antenna transmission power, coal mine wireless communication equipment antenna gain; the electromagnetic wave related parameters include: electromagnetic wave frequency, electromagnetic wave propagation distance; the energy storage type metal related parameters include: energy storage type metal physical parameters, energy storage type metal angle parameters.

[0014] Optionally, according to the safety assessment method described in the embodiment of the present application, the characteristic parameters of the methane gas are: the methane-air ignition volume ratio is 8.0%-8.6%, the ignition time is 200μs, and the minimum ignition energy is 1600μJ.

[0015] Optionally, according to the safety evaluation method described in the embodiment of the present application, the energy storage type metal structure physical parameters are characterized in that the energy storage type metal physical parameters include: the number of turns of the metal coil N, the cross-sectional area of ​​the metal coil A L , metal magnetic path length l, metal parallel plate area A C , the distance between metal parallel plates is d.

[0016] Optionally, according to the safety evaluation method described in the embodiment of the present application, the energy storage element parameters are calculated by a formula, the energy storage type metal coil part is equivalent to an inductive energy storage element; the energy storage type metal parallel plate part is equivalent to a capacitive energy storage element, and the specific formula is: The calculation formula of the inductive energy storage element parameter L is: The calculation formula of the capacitive energy storage element parameter C is: Where: μ0 is the magnetic permeability of vacuum, μ is the magnetic permeability of metal coil core, ε0

[0017] is the vacuum dielectric constant, ε r is the relative dielectric constant.

[0018] Optionally, according to the safety evaluation method described in the embodiment of the present application, the energy storage type metal discharge spark energy meter

[0019] The calculation method is calculated by the formula:

[0020]

[0021] Where: W is the discharge spark energy, P t is the transmission power of the coal mine wireless communication equipment antenna, G t is the antenna gain of the coal mine wireless communication equipment, cosθ is the angle parameter of the energy storage metal, d h is the electromagnetic wave propagation distance, c is the electromagnetic wave propagation speed under vacuum conditions, c = 3 × 10 8 m / s, f is the electromagnetic wave frequency, R is the energy storage metal equivalent resistance, R≈100Ω, and T is the ignition time.

[0022] Optionally, according to the safety evaluation method described in the embodiment of the present application, the safety criterion is: the discharge spark energy is compared with the minimum ignition energy. If it is greater than the minimum ignition energy, it is determined to be dangerous, and the safety reference distance between the coal mine wireless communication equipment and the energy storage metal and the output power of the coal mine wireless communication equipment are given; if it is less than or equal to the minimum ignition energy, it is determined to be safe.

[0023] Optionally, according to the safety assessment method described in the embodiment of the present application, the parameter calculation method first determines that the minimum ignition energy is 1600μJ, and substitutes it into the energy storage type metal discharge spark energy calculation method. If the safety reference distance between the coal mine wireless communication equipment and the energy storage type metal is solved, the transmission power of the coal mine wireless communication equipment antenna is determined. If the output power value of the coal mine wireless communication equipment is solved, the electromagnetic wave propagation distance is determined.

[0024] The technical advantages of this application are:

[0025] This application proposes a safety evaluation method for inductive-capacitive hybrid energy storage metal-coupled electromagnetic waves that is more in line with the actual coal mine underground environment, filling the gap in this field and improving the safety of coal mines. This technology is a non-explosive evaluation method, saving the cost of explosive safety testing. This technology is simple to calculate, highly practical, and saves manpower and time costs. Description of the drawings:

[0026] Figure 1 This is a flow chart of the safety evaluation of energy storage type metal coupled electromagnetic wave energy provided by an embodiment of the present application. Specific implementation method:

[0027] In order to solve the problems in the above background technology, the present application provides a safety evaluation method for energy storage metal coupled electromagnetic wave energy. The method measures the relevant parameters of coal mine wireless communication equipment, electromagnetic wave related parameters, and energy storage metal related parameters; calculates the energy storage element parameters according to the energy storage metal related parameters, and then substitutes them into the energy storage metal discharge spark energy calculation formula to obtain the discharge spark energy value, thereby evaluating the safety of energy storage metal coupled electromagnetic wave energy.

[0028] Figure 1 It is a flow chart of the safety evaluation of energy storage type metal coupled electromagnetic wave energy provided by an embodiment of the present application, wherein the relevant parameters specifically refer to the antenna transmission power of coal mine wireless communication equipment, the antenna gain of coal mine wireless communication equipment, the electromagnetic wave frequency, the electromagnetic wave propagation distance, the physical parameters of the energy storage type metal, and the angle parameters of the energy storage type metal.

[0029] Formula 1: The applicable scenario of the safety evaluation method of this application is that the energy storage metal is a hybrid energy storage metal structure, the underground tunnel environment of the coal mine is a flammable and explosive environment with the presence of gas, the ignition volume ratio of methane to air is 8.0% to 8.6%, the ignition time is 200μS, and the minimum ignition energy is 1600μJ.

[0030] The specific implementation plan of the safety evaluation method of this application is as follows:

[0031] (1) Measure the parameters related to coal mine wireless communication equipment, electromagnetic wave and energy storage metal; the parameters related to coal mine wireless communication equipment include: coal mine wireless communication equipment antenna transmission power, coal mine wireless communication equipment antenna gain; the electromagnetic wave parameters include: electromagnetic wave frequency, electromagnetic wave propagation distance; the parameters related to energy storage metal include: metal coil turns N, metal coil cross-sectional area A L , metal magnetic path length l, metal parallel plate area A C , the distance between metal parallel plates is d.

[0032] (2) The energy storage type metal coil part is equivalent to the inductive energy storage element; the energy storage type metal parallel plate part is equivalent to the capacitive energy storage element, and the energy storage type metal parameters are substituted into the calculation formula of the inductive energy storage element and the capacitive energy storage element to calculate the energy storage element parameters; the calculation formula of the inductive energy storage element parameter L is: The calculation formula of the capacitive energy storage element parameter C is: Where: μ0 is the vacuum magnetic permeability, μ is the metal coil core magnetic permeability, ε0 ​​is the vacuum dielectric constant, ε r is the relative dielectric constant.

[0033] (3) Substitute the measured relevant parameters and the calculated energy storage element parameters into the energy storage type metal discharge spark energy calculation formula to determine the discharge spark energy. The calculation formula is as follows:

[0034]

[0035] (4) Compare the calculated discharge spark energy with the minimum ignition energy of the gas: if it is greater than the minimum ignition energy of the gas, it is judged as dangerous; if it is less than or equal to the minimum ignition energy of the gas, it is judged as safe.

[0036] (5) Under dangerous conditions, the safe reference distance between coal mine wireless communication equipment and energy storage metal and the output power of coal mine wireless communication equipment are given; the specific parameter calculation method is as follows: first determine that the ignition time of gas is 200μS, and the minimum ignition energy is 1600uJ, and substitute them into the calculation method of the discharge spark energy of the energy storage metal. If the safe reference distance between coal mine wireless communication equipment and energy storage metal is solved, then substitute the known coal mine wireless communication equipment antenna transmission power. If the output power value of coal mine wireless communication equipment is solved, then substitute the known electromagnetic wave propagation distance.

[0037] The safety evaluation method of this application fills the gap in this field and improves the safety of coal mines. This technology is a non-explosive evaluation method, which saves the cost of explosive safety testing. This technology is simple to calculate, highly practical, and saves manpower and time costs.

Claims

1. A method for safety evaluation of energy storage type metal coupling electromagnetic wave energy, characterized in that: The safety evaluation method is applicable to the case where the energy storage metal is a hybrid energy storage metal structure, and the environment where the energy storage metal is located is an explosive environment in a coal mine tunnel where the gas exists. The safety evaluation method includes: Step 1: Measure the parameters related to coal mine wireless communication equipment, electromagnetic wave and energy storage metal; Step 2: Calculate the energy storage element parameters based on the energy storage metal parameters; Step 3: Based on the coal mine wireless communication equipment related parameters, the electromagnetic wave related parameters, and the energy storage element parameters, the discharge spark energy is determined according to the energy storage type metal discharge spark energy calculation formula; Step 4: Based on the discharge spark energy, use the safety criterion of coal mine energy storage type metal coupling electromagnetic wave energy to determine whether the current situation is dangerous.

2. The safety assessment method according to claim 1, characterized in that: The coal mine wireless communication equipment related parameters include: coal mine wireless communication equipment antenna transmission power, coal mine wireless communication equipment antenna gain; the electromagnetic wave related parameters include: electromagnetic wave frequency, electromagnetic wave propagation distance; the energy storage metal related parameters include: energy storage metal physical parameters, energy storage metal angle parameters.

3. The safety assessment method according to claim 1, characterized in that: For the methane contained in the gas, the ignition volume ratio of the methane to the air is 8.0% to 8.6%, the ignition time is 200 μs, and the minimum ignition energy is 1600 μJ.

4. The safety assessment method according to claim 2, characterized in that: The energy storage metal physical parameters include: the number of turns of the metal coil N, the cross-sectional area of ​​the metal coil A L , metal magnetic path length l, metal parallel plate area A C , the distance between metal parallel plates is d.

5. The safety assessment method according to claim 1, characterized in that: The energy storage element parameters are calculated by formulas. The energy storage type metal coil part is equivalent to an inductive energy storage element; the energy storage type metal parallel plate part is equivalent to a capacitive energy storage element. The specific formula is: The calculation formula for the inductive energy storage element parameter L is: The calculation formula of the capacitive energy storage element parameter C is: Where: μ0 is the vacuum magnetic permeability, μ is the metal coil core magnetic permeability, ε0 ​​is the vacuum dielectric constant, ε r is the relative dielectric constant.

6. The safety assessment method according to claim 1, characterized in that: The energy storage type metal discharge spark energy calculation method is calculated by the formula: Where: W is the discharge spark energy, P t is the transmission power of the coal mine wireless communication equipment antenna, G t is the antenna gain of the coal mine wireless communication equipment, cosθ is the angle parameter of the energy storage metal, d h is the electromagnetic wave propagation distance, c is the electromagnetic wave propagation speed under vacuum conditions, c = 3 × 10 8 m / s, f is the electromagnetic wave frequency, R is the energy storage metal equivalent resistance, R≈100Ω, and T is the ignition time.

7. The safety assessment method according to claim 1, characterized in that: The safety criterion is: if the discharge spark energy is greater than the minimum ignition energy, it is judged to be dangerous; if the discharge spark energy is less than or equal to the minimum ignition energy, it is judged to be safe.

8. The safety assessment method according to claim 7, characterized in that: After determining the danger, it also includes: providing the safe reference distance between the coal mine wireless communication equipment and the energy storage metal and the output power of the coal mine wireless communication equipment according to the parameter calculation method.

9. The safety assessment method according to claim 8, characterized in that: The parameter calculation method is: first determine that the minimum ignition energy of the gas is 1600μJ, substitute it into the energy storage type metal discharge spark energy calculation method, if the safety reference distance between the coal mine wireless communication equipment and the energy storage type metal is solved, then substitute the known coal mine wireless communication equipment antenna transmission power, if the output power value of the coal mine wireless communication equipment is solved, then substitute the known electromagnetic wave propagation distance.

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