Method for recovering waste heat of high-temperature fuel gas of smelting furnace

Abstract

The invention relates to a method for recovering waste heat of high-temperature fuel gas of a smelting furnace. The method is characterized in that a conventional heat exchanging type combustion mode is operated when the furnace is started or in low-temperature combustion, and a thermal storage type combustion mode is operated when the temperature of the furnace is higher than 950 DEG C. The method is realized through a system for recovering waste heat of high-temperature fuel gas of the smelting furnace. The system comprises the smelting furnace, a thermal storage type regenerative burner system, a fume exhaust induced draft fan, a fuel gas circulation fan and a convection and radiation heat exchanger. According to the waste heat gradient utilization principle and difference of heating loads of the furnace, waste heat resources of fuel gas are recovered in the thermal storage mode and the heat exchanging mode properly, the advantages of the two modes are fully utilized, the waste heat recovery methods are automatically switched according to different temperatures of fuel gas in the furnace, the fuel gas is preheated and returns to the furnace through a flowing fire blocking wall in the furnace, high-temperature fuel gas waste heat is recycled to the maximum extent, waste heat recovery efficiency is improved, energy is effectively conserved, and it is guaranteed that the system can safely and stably operate.

Description

technical field [0001] The invention relates to the field of recovery and utilization of industrial furnaces and flue gas waste heat resources, in particular to a method for recycling high-temperature flue gas waste heat of a smelting furnace. Background technique [0002] Traditional smelting furnaces have problems such as small capacity, high energy consumption, large burning loss, poor operating environment, and severe local overheating and overburning, which lead to inconvenient component control in the smelting process, low production efficiency, and low product yield. [0003] The traditional smelting furnace has no smoke and dust settlement structure, and the smoke and slag are discharged with the flue gas, which is not up to environmental protection standards; or, the smoke and slag are discharged with the flue gas to block the heat storage body, which in turn causes the heat storage body to burn or melt, resulting in accidental shutdown. furnace. [0004] The flue ...

AI Technical Summary

Problems solved by technology

[0002] Traditional smelting furnaces have problems such as small capacity, high energy consumption, large burning loss, poor operating environment, and severe local overheating and overburning, which lead to inconvenient component control in the smelting process, low production efficiency, and low product yield

[0003] The traditional smelting furnace has no smoke and dust settlement structure, and the smoke and slag are discharged with the flue gas, which is not up to environmental protection standards; or, the smoke and slag are discharged with the flue gas to block the heat storage body, which in turn causes the heat storage body to burn or melt, resulting in accidental shutdown. furnace

[0004] The flue gas waste heat recovery method of the traditional smelting furnace mainly adopts the following two methods: 1. The metal heat exchanger is used to preheat the air with high-temperature flue gas

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