Hot stove combustion air time-sharing preheating system

Abstract

The invention relates to a time-sharing preheating system for combustion-supporting air of a hot-blast stove, which comprises a hot-blast stove and a combustion-supporting fan. Combustion air heat exchange channel and exhaust gas channel in the furnace. The outlet of the combustion-supporting fan can communicate with the combustion-supporting air inlet through a combustion-supporting air heat exchanger, and the combustion-supporting air heat exchanger is provided with a combustion-supporting air channel and a first exhaust gas channel, and the outlet of the combustion-supporting air channel can pass through the first combustion-supporting air channel. The air passage or the second combustion-supporting air passage communicates with the combustion-supporting air inlet, and the combustion-supporting air heat exchange channel in the furnace is connected in series with the second combustion-supporting air passage. The preheating system can not only meet the needs of the hot blast stove to store a large amount of heat in the initial stage of firing, but also meet the needs of increasing the temperature of the hot blast stove vault in the middle and later stages of firing. The structure is simple and the cost input is low.

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 hot blast stove combustion-supporting air suitable for iron-making processes. Background technique [0002] With the development of large-scale blast furnaces and the increasing cost pressure of the iron and steel industry, it is particularly important to strengthen the smelting of 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, it is also an extremely important and effective means to increase the air supply temperature of the hot blast stove. [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.) for furnace combustion, but domestic steel plants generally lack high calorific value gas, and use a s...

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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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