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在高炉热风炉中用高炉煤气、垃圾制燃气、低热值煤气加热循环还原气,或用红焦、热DRI(直接还原铁)等热量加热循环还原气至1100℃,输入还原竖炉加热铁矿煤球团,生产DRI,从炉顶气中回收硫和CO2,炉顶气净化后作为还原气循环使用.球团内煤干馏形成的半焦、焦炭起到了与高炉内焦炭不同的骨架作用.利用还原反应后气体余热来预热和干馏球团,利用铁精矿粉和煤粉的高比表面积,利用煤的干馏气化促进低温下碳的一次气化反应和直接还原反应,使DRI煤耗进一步降低.设炉顶气温度降到150℃,配煤218kg,高炉煤气消耗约947m3时,工艺能耗约333kg/t煤.比高炉工艺节能约52%,减排CO2约83%.比MIDREX节能约84kg标准煤.该工艺简称为DRI-NHQ.
In blast furnace stove with blast furnace gas, waste gas, low calorific value gas heating circulating reducing gas, or with red coke, hot DRI (direct reduction of iron) and other heat heating reduction cycle to 1100 ° C, input reduction furnace heated iron ore Coal pellets produce DRI, and sulfur and CO2 are recovered from the top gas, and the top gas is purified to be recycled as reducing gas. The semi-coke and coke formed by the carbonization inside the pellets play a different skeleton role from the coke in the blast furnace. After the reduction reaction, the waste heat of the gas is used to preheat and dry the pellets. Using the high specific surface area of the iron ore concentrate powder and the pulverized coal, the primary gasification reaction and the direct reduction reaction of carbon at a low temperature are promoted by the carbonization of the coal, thereby further reducing the DRI coal consumption Reduce the furnace top gas temperature to 150 ℃, coal blending 218kg, blast furnace gas consumption of about 947m3, the process energy consumption of about 333kg / t coal than the blast furnace process energy saving of about 52%, about 83% reduction of CO2. About 84kg of standard coal. The process referred to as DRI-NHQ.