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采用有限元方法对微波照射下由黄铁矿和方解石组成的岩石颗粒的温度场分布进行了分析,并讨论了微波功率和时间对温度场的影响。研究结果表明:岩石颗粒中心温度最高且受微波腔体内电场强度影响;温度梯度最高点位于黄铁矿和方解石的交界面,热应力最大;岩石颗粒最高温度相同时,微波加热功率与时间成反比;岩石颗粒能耗相同时,采用短时间高功率的加热方法可以提高破岩效率。
The temperature field distribution of rock particles composed of pyrite and calcite under microwave irradiation was analyzed by finite element method. The influence of microwave power and time on the temperature field was also discussed. The results show that the center temperature of rock particle is the highest and affected by the electric field strength in microwave cavity. The highest temperature gradient is located at the interface between pyrite and calcite, and the thermal stress is the highest. When the maximum temperature of rock particle is the same, the microwave heating power is inversely proportional to time ; Rock particles with the same energy consumption, the use of short-term high-power heating method can improve rock breaking efficiency.