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为研究微波和常规加热时煤储层内温度场的演化规律及储层瓦斯解吸量的变化规律,采用理论分析和数值模拟的试验方法,构建了以岩石SEM图像为几何特征,瓦斯和煤基质块体为传热介质的共轭传热模型,对比了常规加热和微波功率为1W 3W 5W 7W时温度场的演化过程.结果表明:微波加热时热量由煤储层内向外传递,传热速率是常规加热的1.5倍,且传热速率与微波功率呈对数增长关系;温度场的分布在微波电场传播方向上具有明显的阶段性和区域分布不均匀性,在距离微波端口处温度值最大,随距离增加温度值快速降低;在端口附近200 um的范围内温度的极差值是中部区域的14倍;瓦斯的吸附量随功率的增大基本呈线性递减关系.
In order to study the evolution law of temperature field and the evolution law of gas desorption amount in coal reservoir during microwave and conventional heating, using the theoretical analysis and numerical simulation test method, the rock SEM image geometry features, gas and coal matrix The block heat transfer medium heat transfer model, compared with the conventional heating and microwave power 1W 3W 5W 7W temperature field evolution process.The results show that: microwave heating heat transfer from the coal reservoir to the outside, the heat transfer rate Which is 1.5 times higher than that of conventional heating, and the heat transfer rate has a logarithmic increase with microwave power. The distribution of temperature field has obvious stage and regional distribution unevenness in the direction of microwave electric field propagation. , And the temperature decreases rapidly with increasing distance. The range of 200 um near the port is 14 times that of the central region. The gas adsorption amount decreases linearly with the increase of power.