Alloy raw material preheating device and method

Abstract

The invention relates to an alloy raw material preheating device. The alloy raw material preheating device comprises a feeding unit, a preheating furnace, a combustion unit and a smoke exhaust unit, wherein the feeding unit is provided with a storage bin; the storage bin is arranged above the preheating furnace; the preheating furnace is composed of a furnace body, a hopper and a discharging pipe from top to bottom; the hopper is of a double-layer structure and is composed of an inner-layer conical hopper and an outer-layer conical hopper; an annular flue gas flow channel is formed between the inner-layer conical hopper and the outer-layer conical hopper; the combustion unit comprises a combustor, a combustion-supporting fan and an air heat exchanger; a combustion-supporting air inlet of the combustor is connected with the combustion-supporting fan through the air heat exchanger; the annular flue gas flow channel is connected with the storage bin through the air heat exchanger; and the storage bin is connected with a negative-pressure waste gas flue through a smoke exhaust pipeline. According to the alloy raw material preheating device and method, online stable preheating of materials can be realized, the energy consumption of the steelmaking procedure is reduced, the device investment is low, and the existing smelting process does not need to be greatly changed; and meanwhile, graded gradient utilization and secondary filtering of smoke heat are achieved, the heat efficiency is high, and the environmental protection property is high.

Description

technical field [0001] The invention relates to the technical field of ferroalloy production and metal smelting, in particular to an alloy raw material preheating device and method. Background technique [0002] With the rapid growth of our country's economy, various technologies in the iron and steel field have made great progress, but at the same time, huge resource and environmental costs have been paid. The contradiction between economic development and resource shortage has become increasingly acute, affecting the sustainable development of the national economy. Transformation and upgrading in the direction of energy saving, environmental protection, low carbon, and green is the only way to essentially solve the above problems, and it is also the only way out for the iron and steel industry to get out of the predicament. [0003] In recent years, the preheating of alloy raw materials for smelting before smelting has become an important measure to reduce the tapping temp...

AI Technical Summary

Problems solved by technology

However, in existing domestic steelmaking production enterprises, most of the alloy raw materials are directly blended into molten steel or into the electric furnace without preheating, which requires high-temperature tapping or consumes a large amount of electric energy to melt low-temperature materials, resulting in high energy consumption for smelting, and power consumption ranks first high

[0004] In response to the above problems, some enterprises use rotary kilns to heat alloy raw materials, and put the raw materials into electric furnaces after preliminary heating. Although this has played a role in reducing power consumption to a certain extent, when using this method, the raw materials are prone to overheating. situation, thus causing secondary oxidation of the reducing agent in the ingredients, resulting in inaccurate dosage of the reducing agent and affecting smelting production, so it has not been widely promoted

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