本文采用折合能级降δΩ和折合绝对温度T_(eq)两个指标,从能平衡、(火用)平衡和能级平衡的观点。评定余热利用系统的优劣,以折合能级降δΩ小而折合绝对温度T_(eq)高者为优。文中以计算实例,比较了轧钢加热炉烟气余热的利用方案。结果表明,以发电量多者为最好方案。 In this paper, we use the equivalent energy level down δΩ and the equivalent temperature T_ (eq) two indicators, from the balance, exergy balance and energy level balance point of view. Assessment of the advantages and disadvantages of waste heat utilization system, in order to reduce the energy level down δΩ small and equivalent to the absolute temperature T_ (eq) high as excellent. In this paper, an example is given to compare the utilization scheme of residual heat of flue gas in rolling furnace. The result shows that it is the best plan to produce more power.