Time-sharing preheating system for combustion-supporting air of hot-blast stove

Abstract

The invention discloses a time-sharing preheating system for combustion-supporting air of a hot-blast stove. The time-sharing preheating system comprises the hot-blast stove and a combustion-supporting fan, wherein an in-stove preheating device for the combustion-supporting air is arranged on the lower part of the inner cavity of the hot-blast stove; and an in-stove heat exchange channel for the combustion-supporting air and an in-stove waste smoke channel are arranged in the in-stove preheating device for the combustion-supporting air. The outlet of the combustion-supporting fan is capable of communicating with a combustion-supporting air inlet through a heat exchanger for the combustion-supporting air; a combustion-supporting air channel and a first waste smoke channel are arranged in the heat exchanger for the combustion-supporting air; the outlet of the combustion-supporting air channel is capable of communicating with the combustion-supporting air inlet through a first combustion-supporting air passage or a second combustion-supporting air passage; and the in-stove heat exchange channel for the combustion-supporting air is serially communicated onto the second combustion-supporting air passage. The preheating system is capable of meeting the need of accumulating lots of heat by the hot-blast stove in the initial period of stove burning and the need of rising the crown temperature of the hot-blast stove in the middle and later periods of the stove burning, simple in structure and low in cost investment.

Description

technical field [0001] The invention relates to the technical field of hot blast stoves in the metallurgical industry, in particular to a time-sharing preheating system for combustion-supporting air of hot blast stoves suitable for ironmaking processes. Background technique [0002] With the large-scale development of blast furnaces and the increasing cost pressure of the steel industry, it is particularly important to strengthen smelting in blast furnaces and reduce the coke ratio. In addition to reducing the coke ratio from the aspects of production operation level and raw fuel quality, increasing the air supply temperature of the hot blast stove is also an extremely important and effective means. [0003] In order to achieve a hot air temperature above 1250°C, a few iron and steel enterprises use high calorific value gas (coke oven gas, converter gas, etc.) It is still the first choice for various steel companies. [0004] In order to achieve high blast temperature unde...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a time-sharing preheating system for the combustion-supporting air of a hot blast stove, which overcomes the problems of complex structure, large energy consumption, and high operating cost of the preheating system in the prior art. The need to store a large amount of heat in the initial stage of firing the furnace can also meet the needs of increasing the temperature of the hot blast stove vault in the middle and later stages of firing the furnace. The structure is simple and the cost input is low

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