Temperature control method and system for in-situ mining of oil-rich coal

The invention discloses a temperature control method and system for in-situ mining of oil-rich coal. The method comprises the following steps of establishing a thermal analysis geologic model for in-situ mining of the oil-rich coal; fluid being injected into the thermal analysis geologic model and flows out through a pipeline outlet; carrying out computational fluid mechanics thermal simulation analysis on the in-situ mining thermal analysis geologic model, and establishing a coal seam heating model; and control signal input being obtained through calculation based on the obtained coal seam heating model by a dynamic matrix control algorithm. Firstly, according to the in-situ mining condition and geologic features of the oil-rich coal, a thermal analysis geologic model is simplified and constructed; then finite element thermal analysis is carried out based on the oil-rich coal thermal analysis geological model, and a heating model of an oil-rich coal seam object is established according to obtained control object step response data; finally, model control signal input is obtained through calculation of the heating model according to a dynamic matrix control algorithm, and the coal seam temperature reaches the reference temperature. The method is advantaged in that the coal seam real-time temperature serves as feedback quantity to calculate and input control signals, and the heat utilization rate of injected fluid can be improved.