定量研究了在反馈控制系统中微波加热化学反应热失控的条件.首先,基于反馈控制原理导出了热失控的工程条件,给出了其数学定义.然后,通过对波导中进行的化学反应进行微波加热的仿真计算,定量研究了4种不同特性的化学反应在不同的输入微波功率的温升速率,讨论了尚未引起人们注意的热失控与传感器响应时间的相关性. The conditions of thermal runaway in microwave heating chemical reaction are studied quantitatively. First, the engineering conditions of thermal runaway are derived based on the feedback control principle and its mathematical definition is given. Then, The simulation of heating, quantitatively studied the temperature rise rate of four different chemical reactions at different input microwave powers, and discussed the relationship between the thermal runaway and sensor response time which has not drawn much attention.