Air gas primary heater unit of hot-air stove

Abstract

The invention provides an air and coal gas preheating device of an air heating furnace and comprises a combustion mixing furnace, an air heat interchanger, a coal gas heat interchanger and an assorted blower as well as a valve. A draft fan is adopted to lead waste gas in a flue of the air heating furnace into a mixing chamber of the combustion furnace and then waste gas is mixed with high temperature flue gas generated by the combustion furnace so that air and coal gas can be heated while mixed flue gas conducts heat exchanging. A high temperature air heat interchanger is added on the basis of the preheating device so that the preheating device can become a second preheating device; the second preheating device preheats air and coal gas with flue in the air heating furnace and then leads waste gas in the flue of the air heating furnace into the mixing chamber of the combustion furnace with the high temperature draft fan, moreover, waste gas is mixed with high temperature flue gas and combustion-supporting air is preheated secondly. The invention not only takes use of afterheat of large amount of low temperature waste gas, but also transforms coal gas with low thermal valve into wind temperature with high value, meanwhile, the invention preheats combustion-supporting air and has the advantages of compact structure, reasonable arrangement, low investment, low operation cost, etc.

Description

technical field [0001] The invention relates to an accessory equipment of a hot blast stove, in particular to an air and gas preheating device for a hot blast stove with an additional combustion mixing stove. Background technique [0002] With the advancement of ironmaking technology, the coke ratio of blast furnaces has decreased year by year, resulting in a decrease in the calorific value of blast furnace gas. Generally, the calorific value of blast furnace gas is only 3000KJ / m 3 For example, the air temperature of the single-fired blast furnace gas in the hot blast stove can only reach about 1000-1050 °C, which cannot meet the needs of high air temperature at all. Therefore, domestic ironworks have taken many measures to increase the air temperature, such as co-firing coke oven gas with high calorific value, using waste heat of hot blast stove flue gas to preheat air and gas, etc. Due to the general lack of coke oven gas with high calorific value in iron and steel enterp...

AI Technical Summary

Problems solved by technology

Due to the general lack of coke oven gas with high calorific value in iron and steel enterprises, and the temperature of the flue gas is not too high, the use of separate heat pipe technology can only preheat the air and gas to about 140°C, which can increase the air temperature by about 80-90°C , still can not meet the needs of high wind temperature of 1200 ℃

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