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利用热风炉烟道低温废气余热来预热助燃空气,既能提高热风炉热效率,又能提高拱顶燃烧温度,达到提高风温的目的,是一种一箭双雕经济实惠的炼铁节能措施.特别在高炉煤气日益贫化,而高热值煤气供应困难的情况下更具有现实意义.近年来日本高炉热风炉上采用的低温予热器有板式、载热体循环式和回转再生式三种.它们各有利弊,但都能利用250℃左右的烟道废气将助燃空气予热到200℃左右,提高热风炉效率4%,在保持拱顶温度不变的情况下可节
Utilizing the residual heat of low-temperature waste gas from the hot blast furnace flue gas to preheat the combustion air can not only improve the thermal efficiency of the hot blast stove but also increase the combustion temperature of the vault to achieve the purpose of raising the temperature of the wind, which is an economical and economical iron-making energy saving measure with double- Blast furnace gas is becoming increasingly depleted, while the supply of high calorific value gas is more practical.Low temperature preheaters used in Japanese blast furnaces in recent years are plate-type, heat-transfer-cycle type and rotary regenerative type, each of which has However, all the flue gas of about 250 ° C can be used to preheat the combustion air to around 200 ° C to improve the efficiency of the hot stove by 4%. While keeping the vault temperature constant,