Online monitoring method for fire-facing side wall temperature of supercritical carbon dioxide boiler furnace

The invention discloses a supercritical carbon dioxide boiler hearth fire-facing side wall temperature online monitoring method, and belongs to the technical field of boilers. The method comprises the following steps: step 1, carrying out two-dimensional steady-state heat conduction calculation on a membrane wall structure, and solving a temperature difference relationship between a pipe wall and fluid in a pipe; 2, calculating and solving an in-pipe heat exchange coefficient alpha through pipeline flow distribution; and step 3, solving the carbon dioxide temperature in the pipe and the thermal load outside the pipe by using heat balance. According to the online monitoring method for the hearth membrane wall of the supercritical carbon dioxide boiler, safe operation of the supercritical carbon dioxide boiler is guaranteed, and real-time monitoring of the wall temperature of the fire facing face is indirectly achieved by measuring parameters such as the wall temperature of the fire backing side and the flow, t