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为了评价矿井射频设备电磁波能量对瓦斯的安全性,提出了井下存在的两种电磁波能量耦合方式:磁耦合共振和电磁波辐射谐振能量耦合.基于磁耦共振模型,分析了磁耦共振方式的最大能量传输效率.针对远场辐射,结合低衰减度传输线模型,从电大型和电小型两方面研究了井下金属结构作为电磁波接收天线可以向负载输送的最大功率.得出了不同能量耦合方式下射频源和耦合结构间的安全距离公式.结果表明:磁耦共振方式能量传输效率随线圈半径和导体半径增加而提高,但变化率与收发线圈间距有关;固定线圈和导体半径,效率随线圈间距的增大而降低.对于电磁辐射能量,安全距离随工作频率先增大后降低.结合井下实际,磁耦共振方式的安全距离为2m,电磁波远场辐射能量的安全距离为25m.
In order to evaluate the safety of the electromagnetic energy of mine RF equipment on gas, two coupling methods of energy coupling are proposed: energy coupling between magnetic coupling and electromagnetic radiation. Based on the magnetic coupling model, the maximum energy of the magnetic resonance coupling Transmission efficiency.For the far-field radiation, combined with the low attenuation transmission line model, from the electric large and small two aspects of the underground metal structure as the electromagnetic wave receiving antenna can deliver the maximum power to the load.It comes to different energy coupling RF source The results show that the energy transfer efficiency increases with the increase of coil radius and conductor radius, but the rate of change is related to the distance between the transmitter and the receiver coil. The efficiency of the fixed coil and the conductor increases with the increase of the coil spacing For the electromagnetic radiation energy, the safety distance firstly increases and then decreases with the working frequency.According to the actual underground, the safety distance of the magnetic coupling method is 2m, and the safe distance of the far-field radiation energy of the electromagnetic wave is 25m.