Electric furnace flue gas waste heat recovering and temperature regulating device

Abstract

The invention relates to an electric furnace flue gas waste heat recovering and temperature regulating device comprising an electric furnace, a scrap steel preheating channel, a settling chamber, waste heat recovering equipment, a dust remover, a dust-removing blower and an exhaust stack. The scrap steel preheating channel is connected with the electric furnace; the settling chamber is connected with the preheating channel; the waste heat recovering equipment, the dust remover, the dust-removing blower and the exhaust stack are sequentially connected with the settling chamber; a temperature control device is arranged on the scrap steel preheating channel and comprises a first temperature sensor, a second temperature sensor, a PLC control system and a variable frequency fan, wherein the first temperature sensor is arranged between the electric furnace and the scrap steel preheating channel; the second temperature sensor is arranged between the preheating channel and the settling chamber; the PLC control system is arranged between the first temperature sensor and the second temperature sensor; and the variable frequency fan is connected with the PLC control system. The PLC control system can regulate the wind-drawing volume of the variable frequency fan according to temperature signals of the first temperature sensor and the second temperature sensor, thereby changing the amount of mixed cold wind entering into the waste heat recovering equipment and the flue gas temperature, achieving the purpose of regulating and controlling the flue temperature of an inlet of the waste heat recovering equipment and ensuring the operation stability and the safety of the waste heat recovering equipment.

Description

technical field [0001] The invention relates to a temperature control device, in particular to an electric furnace flue gas waste heat recovery temperature adjustment device. Background technique [0002] The flue gas discharged from the steelmaking electric furnace contains a large amount of high-temperature waste heat. The temperature of the waste heat flue gas fluctuates violently and contains a large amount of dust. Due to the needs of energy saving and emission reduction, the utilization of this high-temperature waste heat has gradually become mature and popular. At present, the utilization methods of waste heat of electric furnace mainly include scrap steel preheating and waste heat boiler. Generally, a scrap steel preheating channel is set at the outlet of the electric furnace to use part of the waste heat, and then the hot flue gas is introduced into the settling chamber and sent to the waste heat boiler for further heat recovery. While the dust removal fan sucks th...

AI Technical Summary

Problems solved by technology

The disadvantage of this method at present is that it overemphasizes the harm of mixing cold air. Since the cold air is basically no longer mixed in, the high-temperature flue gas from the electric furnace still maintains a very high temperature when it enters the waste heat equipment after the settling chamber, making the waste heat equipment Often under the harsh working conditions of high temperature, burst pipe leakage occurs from time to time

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