High blast temperature system of blast furnace hot blast stove

Abstract

A high blast temperature system of a blast furnace hot blast stove belongs to the blast furnace iron making technique field in iron and steel industry. The system comprises a blast furnace, a hot blast stove, a detachable heat pipe exchanger, a blower, a chimney, a four-way valve, a connection pipeline and the like. The system is provided with two to four hot blast stoves, wherein, after one heating furnace is heated, 10 to 25 percents of hot air flows back to a combustion-supporting air line of another hot blast stove; simultaneously, 10 to 25 percents of high-temperature smoke of the hot blast stove in combustion period is introduced to preheat the combustion-supporting air through installing a ceramic heat accumulator in a discharging pipeline; the preheated combustion-supporting air is mixed with the reflow hot air as high-temperature combustion-supporting air which preheats coal gas together with the discharged air from the ceramic heat accumulator through the detachable heat exchange of the heat pipe; and then the preheated coal gas and the high-temperature combustion-supporting air enter into the hot blast stove to be combusted. The top of the hot blast stove can be raised to 1400 to 1600 DEG C through such a method, thereby raising the air temperature of the hot blast stove by 100 to 400 DEG C, and realizing the air temperature of the dead-burned blast furnace gas hot blast stove of 1200 to 1500 DEG C.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking in the iron and steel industry, and in particular provides a high blast temperature system of a blast furnace hot blast stove, which is suitable for use in the case of fully burning blast furnace gas. Background technique [0002] The hot blast stove is the main auxiliary equipment of the blast furnace. Its function is to provide the blast furnace with the hot air required for ironmaking. In the case of full combustion of blast furnace gas, because the theoretical combustion temperature is lower than 1400 °C and the air temperature level is lower than 1200 °C, the single The body hot blast stove technology cannot meet the requirements of air temperature above 1200°C. For this reason, in the hot blast stove system, it is often used to mix and burn high calorific value gas, metal heat exchanger to preheat combustion-supporting air or gas, hot blast stove itself to preheat, and additi...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a blast furnace hot blast stove high blast temperature system, to overcome the problem that the full-fired blast furnace gas hot blast stove cannot achieve a blast temperature above 1200°C, improve the existing hot blast stove system flow, and greatly increase the combustion air preheating temperature, Realize high air temperature, and at the same time have the advantages of simple process design, compact system layout, wide application range and low cost

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