Hot-blast stove system of blast furnace

Abstract

The invention provides a hot-blast stove system of a blast furnace. The hot-blast stove system comprises a plurality of hot-blast stoves, a plurality of first heat exchange units, at least one second heat exchange unit, a combustion-supporting device, a chimney, a main air pipe, a main coal gas pipe and a main flue gas pipe. The multiple hot-blast stoves and the multiple first heat exchange units are arranged in a one-to-one correspondence mode. All the hot-blast stoves communicate with the main flue gas pipe and one of the main coal gas pipe and the main air pipe through the corresponding first heat exchange units, and all the hot-blast stoves communicate with the main flue gas pipe and the other one of the main coal gas pipe and the main air pipe through the second heat exchange units. The main flue gas pipe communicates with the chimney. The main air pipe communicates with the combustion-supporting device. By means of the hot-blast stove system of the blast furnace, at least one of coal gas and combustion-supporting air can be preheated with waste flue gas of one single hot-blast stove, high-temperature waste flue gas heat which is generated by last-phase combustion can be effectively utilized so that the coal gas and / or the combustion-supporting air can reach 280-310 DEG C, and thus the arch crown temperature and hot-blast temperature of each hot-blast stove can be further raised.

Description

technical field [0001] The invention relates to the technical field of blast furnace hot blast stoves in the metallurgical industry, in particular to a blast furnace hot blast stove system. Background technique [0002] In the metallurgical industry, increasing the hot air temperature is an effective way to save energy and reduce consumption in blast furnace ironmaking. For every 100°C increase in air temperature, the ton iron-coke ratio can be reduced by about 20kg, the amount of coal injection can be increased by about 50kg, and the output can be increased by about 4%. Therefore, all major iron and steel enterprises regard how to increase the temperature of hot air as a very important technology to study. [0003] The most direct means to increase the temperature of the hot blast is to increase the vault temperature of the hot blast stove. Because the calorific value of blast furnace gas produced by blast furnace ironmaking is low, the hot blast stove using blast furnace ...

AI Technical Summary

Problems solved by technology

For enterprises, although higher hot air temperature can be obtained, the consumption of high-calorific gas with higher value is increased, which is not the best solution for firing furnaces

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