高炉渣余热回收系统的热力学分析

采用焓-火用图热力学分析方法对不同高炉渣余热回收模式进行分析，对物理法回收余热生产热水和水蒸气，不同化学反应的化学法回收余热的焓效率和火用效率进行计算和对比分析.结果表明:物理法回收余热生产热水和生产蒸气的焓效率相同，都为769%，而火用效率分别为144%，342%；利用化学法回收余热的焓效率高达922%，火用效率为60%左右，二者均高于物理法；利用C-CO2的煤气化反应对高炉渣余热进行回收时，每吨渣可以消耗165kg的CO2，有利于钢铁企业实现节能目标.

Thermodynamic Analysis of BF Slag Waste Heat Recovery System Using Enthalpy Exergy Diagram

The heat recovery efficiency of different BF slag waste heat recovery systems were analyzed by using enthalpy exergy diagram. Enthalpy and exergy efficiency were calculated and compared by physical recovery method to produce hot water or steam and chemical recovery method by endothermic reactions of decomposition of limestone， coal gasification， methane reforming. The results showed that the heat efficiency of applying the waste heat of BF slag to produce hot water is 769%， equal to that of producing steam. While the enthalpy efficiency of the two is different， the former is 144%， and the later is 342%. The heat efficiency of chemical reaction with BF slag is as high as 922%， while the enthalpy efficiency is 627%. Both are higher than those of physical heat recovery method. Applying the coal gasification to recover the waste heat of BF slag can absorb 165 kg per tone of slag， which attribute to realize the goal of energy conservation and slow down the greenhouse effect.