Smelting electric furnace waste heat recovery and recirculation system and method

Abstract

The invention discloses a smelting electric furnace waste heat recycling and recirculation system. The smelting electric furnace waste heat recycling system comprises a dust remover, a waste heat boiler, an induced draft fan and a recirculation draft fan. A smoke outlet of the dust remover is connected with a smoke inlet of the waste heat boiler through a smoke-air pipeline. A smoke outlet of the waste heat boiler, a smoke inlet of the induced draft fan and a smoke inlet of the recirculation draft fan are connected through the smoke-air pipeline. The smoke outlet of the recirculation draft fan is connected with a smoke inlet of the dust remover through the smoke-air pipeline. The invention discloses a smelting electric furnace waste heat recycling and recirculation method simultaneously. The recirculation draft fan with appropriate parameters is selected by calculating; and part of low-temperature smoke is extracted from the smoke outlet of the waste heat boiler and led in the smoke inlet of the dust remover. The heat flow of smoke at the smoke inlet of the waste heat boiler is increased, the recovery efficiency of the waste heat boiler is improved, the material heat resistant class is lowered, and the engineering cost is reduced.

Description

technical field [0001] The invention relates to a waste heat recovery system and method, in particular to a submerged arc furnace waste heat recovery and recycling system and method in ore smelting in industrial production. Background technique [0002] In the process of ore iron smelting, the working temperature of the smelting process is as high as 2000°C. During the working process, the high-temperature ore in the furnace continuously emits heat to the surrounding air, making the temperature of the flue gas in the furnace as high as 650°C to 750°C, resulting in approximately total energy After forced cooling, 20% of the energy is discharged into the atmosphere in the form of waste heat along with the dust generated by smelting, causing huge energy waste and environmental pollution. [0003] The waste heat recovery system 100 in the prior art is as figure 1 As shown, the waste heat recovery system 100 includes a dust collector 110 , a waste heat boiler 120 and an induced ...

AI Technical Summary

Problems solved by technology

Due to the high temperature of the flue gas, the flue gas dissipates heat to the environment seriously during the process from the outlet of the submerged arc furnace through the dust collector 110 to the flue gas inlet of the waste heat boiler 120, resulting in the temperature of the flue gas inlet of the waste heat boiler being much lower than the temperature of the flue gas at the outlet of the submerged arc furnace, thus Cause waste heat recovery efficiency is low, resulting in energy waste

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