Linked cyclic utilization method for preheating vertical furnace charge of totally closed submerged arc furnace

Abstract

The invention relates to a linked cyclic utilization method for preheating a vertical furnace charge of a totally closed submerged arc furnace. The method is characterized in that in combination witha totally closed submerged arc furnace smelting process, the flue gas volume generated in the smelting process is small and the process has the characteristic of having gas with relatively high heat value. Self-produced gas of the totally closed submerged arc furnace is recovered by using a hot flue gas generation device, high-temperature flue gas is generated by the hot gas generation device andlow-temperature flue gas after heat exchange in a system is utilized circularly, and a raw material put in a furnace of the submerged arc furnace is heated in a vertical preheating kiln. According tothe heating temperature demand of the raw material put in the furnace, by means of linked adjustment of the high-temperature flue gas generated by the hot flue gas generation device, cyclically utilized low-temperature flue gas and pressure and flow of exhausted flue gas and fully utilizing the high-temperature flue gas to heat the raw material put in the furnace the temperature of the raw material put in the furnace of the submerged arc furnace is increased, the heating temperature range of the raw material in the submerged arc furnace is decreased, the electric consumption of the submerged arc furnace is reduced and the production period of the submerged arc furnace is shortened.

Description

technical field [0001] The invention relates to the technical field of resource and energy utilization in ferroalloy and iron and steel industries, and in particular to a method for preheating, linkage and recycling of vertical charge of a fully enclosed submerged arc furnace. Background technique [0002] my country's ferroalloy output has reached 36 million tons. About 90% of ferroalloy products are produced by submerged thermal electric furnaces. The ferroalloy industry is a large energy consumer. Statistics show that its electricity consumption accounts for more than 2% of the country's total power generation. In the ferroalloy submerged arc furnace smelting process, electric energy consumption accounts for about 70% of the total energy. [0003] At present, the main energy-saving method of the fully enclosed submerged arc furnace is mainly to recover the waste heat of the flue gas of the submerged arc furnace, and does not consider the whole process chain of the submerg...

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Problems solved by technology

[0003] At present, the main energy-saving method of the fully enclosed submerged arc furnace is mainly to recover the waste heat of the flue gas of the submerged arc furnace, and does not consider the whole process chain of the submerged arc furnace smelting as a whole. However, the utilization rate of gas with high calorific value is extremely low, and a large amount of gas is released, resulting in energy waste

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