首钢京唐炼铁余热余能回收及潜力

京唐炼铁余热余能占炼铁工序能耗的60%左右,分布于热风炉、高炉煤气除尘、炉前除尘、渣处理和高炉本体冷却水等系统。重点分析现有工艺技术流程,通过高炉煤气回收、干式TRT和热风炉烟气预热空煤气及制粉三项利用技术,已实现炼铁主要余热余能回收80.8%,指出热风炉烟气和高炉煤气物理显热利用率仅为30%～40%,还有待进一步提高。同时,以末端温度为基础分析了各项低品位余热潜力尚有65.9kgce/t,并提出有效利用放散高炉煤气、热风炉烟气和冲渣水余热等措施和建议,为余热梯级回收和合理高效利用提供依据。

Waste heat recovery and potential of iron-making in Shougang Jingtang

Waste heat and energy in iron - making is account for 60% of process energy consumption, distributing in system of stove, gas de - busting, de - busting before BF, molten slag and cooling water on BF in Jingtung. The present technical flow was analyzed on stress. It shows that percentage of waste heat and energy recovery is 80. 8% by technology such as BFG recovery, dry- TRT and waste gas on hot blast stove preheating air, BFC and coal power, the utilization ratio of waste gas of stove and BFG physical heat is just 30% -40%, and it should be improved further. Different lower grade waste heat potential was analyzed on its end temperature. There is waste heat potential about 65. 9kgce/t, and measures and suggestions such as utilization of BFG, waste gas on hot blast stove and waste heat of slag - disposing water were put forward for grade - recovery and rational high efficient utilization of waste heat.