Journal of Scientific and Engineering Research
Published September 30, 2023 | Version v1
Journal article Open

Numerical Simulation of Coal Seam Gas Migration Response Characteristics under Different Microwave Frequencies

Authors/Creators

  • 1. State Key Laboratory Cultivation Base for Gas Geology and Gas Control (Henan Polytechnic University), Jiaozuo 454003, China;
  • 2. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
  • 3. Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo 454003, China

Description

Abstract Microwave heat injection is an effective means to improve the efficiency of gas extraction. Microwave frequency has a significant influence on microwave performance, but few studies focused on the selection of microwave frequency suitable for gas migration in coal seam. In this study, an electromagnetic-thermal-fluid-solid coupling model of microwave heat injection is established, and the coal seam gas migration law under the four industrial microwave frequencies of 433 MHz, 915 MHz, 2450 MHz and 5800 MHz is simulated. The evolution law of electric field intensity, coal seam temperature, permeability ratio, gas content, cumulative gas extraction amount and gas extraction rate in the process of gas extraction is compared and analyzed. The results show that the temperature of coal seam increases rapidly in the microwave penetration area and then transfers to the low temperature area. The heat injection effect of 915 MHz microwave is the best, and that of 5800 MHz microwave is the worst, and 915 MHz microwave penetration zone is 10 times that of 5800 MHz. Microwave heat injection extraction can improve the permeability of coal seam and promote gas adsorption and desorption. The cumulative gas extraction amount of 915 MHz microwave on the 300th day was 919 m3, and the maximum gas extraction rate reached 26.37 m3/d.

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