Blast furnace hot-blast stove combustion air preheating system and preheating method

Abstract

The invention discloses a blast furnace hot-blast stove combustion air preheating system, comprising a hot-blast stove for burning the combustion air and blast furnace gases and a solar preheating device arranged at the air intake side of the hot-blast stove, wherein the combustion air after being heated by the solar preheating device enters into the hot-blast stove to burn with the blast furnace gases. The air which enters into the hot-blast stove is firstly heated by the solar preheating device and then enters into the hot-blast stove to significantly raise the temperature of the air and then raise the air temperature of the blast furnace, reduce the energy consumption of the iron-making process and improve the production capacity of the blast furnace. Simultaneously, the combustion air after being heated by the solar preheating device is directly conveyed into the hot-blast stove to burn with the blast furnace gases, thus the heat exchange problem is solved, there is no need to arrange extra heat exchange equipment, and the maintenance cost of the heat exchange equipment is saved. The solar preheating device has high heat-utilization efficiency and no environment pollution, can reduce the preheating cost of the blast furnace and simultaneously reduce the smelting cost. The invention further provides a preheating method based on the preheating system.

Description

technical field [0001] The invention relates to the field of ironmaking technology, in particular to a combustion-supporting air preheating system for a blast furnace hot blast stove. In addition, the present invention also relates to a method for preheating combustion-supporting air in a blast furnace hot blast stove. Background technique [0002] In the blast furnace ironmaking process, increasing the blast furnace air temperature can significantly increase the coal ratio, reduce the coke ratio, reduce the energy consumption of the whole ironmaking process, improve the production capacity of the blast furnace and reduce the production cost. Generally speaking, the ideal blast furnace air temperature range is between 1200℃-1300℃, which is provided by the hot blast furnace by burning blast furnace gas. However, due to the general shortage of enriched blast furnace gas with high calorific value in my country's iron and steel enterprises, the general hot blast furnace uses The...

AI Technical Summary

Problems solved by technology

[0006] 2) Utilize the preheating technology of the hot blast stove itself, that is, use the waste heat after the hot blast stove sends air to the blast furnace to preheat the combustion-supporting air. Since the temperature of the hot blast stove will fluctuate greatly, its use is limited;

[0007] 3) Double preheating and top-burning ball preheating furnace technology with additional combustion furnace. It meets the requirements of high wind temperature required by blast furnaces, but the service life of heat exchange equipment is short at high temperatures, the maintenance costs of equipment are high, and air and environmental pollution are increased

Images