Flame state measuring device special for preheating furnace

The utility model relates to the technical field of preheating furnaces, in particular to a flame state measuring device special for a preheating furnace. The device comprises a preheating furnace, a burner and a flame measuring device, a flame part of the burner is positioned in the preheating furnace, the flame measuring device is connected with the burner, and the preheating furnace comprises a radiation cavity and a convection cavity positioned on the upper layer of the radiation cavity; the bottom of the combustor is connected with a gas pipeline, and a control valve is arranged on the gas pipeline. The flame measuring device comprises a thermocouple and a DCS device. The thermocouples are inserted from the lower portion of the combustor and convert collected temperature signals into thermoelectromotive force signals, the DCS device is connected with the control valve and the multiple thermocouples, and the DCS device controls the control valve of the combustor to be started and stopped according to the