<th id="5nh9l"></th><strike id="5nh9l"></strike><th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th><strike id="5nh9l"></strike>
<progress id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"><noframes id="5nh9l">
<th id="5nh9l"></th> <strike id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span>
<progress id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span><strike id="5nh9l"><noframes id="5nh9l"><strike id="5nh9l"></strike>
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"></span><span id="5nh9l"><video id="5nh9l"></video></span>
<th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th>
<progress id="5nh9l"><noframes id="5nh9l">

鐵礦煤球團內生還原氣生產DRI工藝及估算

Technique and estimation of using reducing gas from iron ore-coal briquette to produce direct reduced iron

  • 摘要: 在高爐熱風爐中用高爐煤氣、垃圾制燃氣、低熱值煤氣加熱循環還原氣,或用紅焦、熱DRI(直接還原鐵)等熱量加熱循環還原氣至1100℃,輸入還原豎爐加熱鐵礦煤球團,生產DRI,從爐頂氣中回收硫和CO2,爐頂氣凈化后作為還原氣循環使用.球團內煤干餾形成的半焦、焦炭起到了與高爐內焦炭不同的骨架作用.利用還原反應后氣體余熱來預熱和干餾球團,利用鐵精礦粉和煤粉的高比表面積,利用煤的干餾氣化促進低溫下碳的一次氣化反應和直接還原反應,使DRI煤耗進一步降低.設爐頂氣溫度降到150℃,配煤218kg,高爐煤氣消耗約947m3時,工藝能耗約333kg/t煤.比高爐工藝節能約52%,減排CO2約83%.比MIDREX節能約84kg標準煤.該工藝簡稱為DRI-NHQ.

     

    Abstract: Recycling reducing gas was heated to 1 100℃ with blast furnace gas, fuel gas from garbage power, low caloric value gas or with heat from hot coke, hot direct reduced iron (DRI), or other heat in a hot-blast stove. Then, the recycling reducing gas was input to a reductive shaft kiln to heat iron ore-coal briquette to produce DRI. Sulfur and CO2 were recovered from the top gas, and the purified gas was used as the recycling reducing gas. The carbocoal and coke from coal carbonization in the briquette acted as skeleton, which was different from coke in the blast furnace. The coal consumption of DRI was reduced through using the afterheat of reducing gas to preheat and carbonize briquette, using the high surface area of iron concentrate and coal powder, and using coal carbonization and gasification to accelerate carbon gasification reaction and direct reduction reaction at low temperatures. If the temperature of the top gas drops to 150℃, 218 kg coal is blended, and blast furnace gas of about 947 m3 is consumed, the energy consumption will be about 333 kg/t coal. Compared with the blast furnace process, this process can economize 52% energy and reduce about 83% CO2 emission;it will save about 84 kg standard coal than MIDREX process. This technical process is abbreviated to DRI-NHQ.

     

/

返回文章
返回
<th id="5nh9l"></th><strike id="5nh9l"></strike><th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th><strike id="5nh9l"></strike>
<progress id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"><noframes id="5nh9l">
<th id="5nh9l"></th> <strike id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span>
<progress id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"><noframes id="5nh9l"><span id="5nh9l"></span><strike id="5nh9l"><noframes id="5nh9l"><strike id="5nh9l"></strike>
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"><noframes id="5nh9l">
<span id="5nh9l"></span><span id="5nh9l"><video id="5nh9l"></video></span>
<th id="5nh9l"><noframes id="5nh9l"><th id="5nh9l"></th>
<progress id="5nh9l"><noframes id="5nh9l">
259luxu-164