Iron making method introducing exhaust gas of hot-blast stove into blast furnace air

Abstract

An iron making method introducing the exhaust gas of a hot-blast stove into blast furnace air comprises the following steps: the exhaust gas of the hot-blast stove is introduced to the inlet of a blast furnace blower, the blast furnace blower simultaneously draws off the exhaust gas of the hot-blast stove and air or a special blower is mounted to draw off the exhaust gas of the hot-blast stove, and the drawn exhaust gas of the hot-blast stove is introduced into the blast furnace air, is heated by the hot-blast stove and is blasted to the tuyere area of a blast furnace. The iron making method is characterized in that the exhaust gas of the hot-blast stove is introduced into the blast furnace air, is heated and is blasted to the tuyere area of the blast furnace. The iron making method needs heat compensation and realizes the compensation through improving the air temperature and the rich oxygen. The temperature of the preheating combustion supporting air of a preheating furnace is above 500DEG C, the combustion temperature can reach 1550DEG C only through using the blast furnace gas, the supply air temperature reaches above 1350DEG C, and the temperature of the exhaust gas decreases to below 100DEG C. The iron making method introducing the exhaust gas of the hot-blast stove into the blast furnace air greatly adjusts the output, reduces the coke ratio and reduces the CO2 emission.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking energy saving and emission reduction, and relates to a new ironmaking method for emission reduction and energy saving—an ironmaking method in which blast furnace exhaust gas is mixed with blast furnace exhaust gas. It is suitable for all blast furnaces with surplus air temperature and oxygen enrichment capacity. Background technique [0002] At present, all blast furnaces in my country and the world use pulverized coal or various oils or natural gas or various types of gas or waste plastics to blow into the tuyere of the blast furnace to reduce expensive metallurgical coke. The purpose of injecting these fuels is to utilize the combustible components in these fuels, to replace another high-priced energy with a low-priced energy. Although it can reduce production costs, it cannot reduce emissions. while CO 2 The emission of carbon dioxide has attracted the attention of the whole ...

AI Technical Summary

Problems solved by technology

The purpose of injecting these fuels is to use the combustible components in these fuels to replace one kind of low-priced energy with another high-priced energy. Although it can reduce production costs, it cannot reduce emissions

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