【摘要】 <正> 一、比较余热利用方案优劣的热力学准则 本文分析计算限于下述两类余热:第一类为余热流的来流温度T_a与质量流率m均不变,被利用后余热流直接排至环境;第二类为余热流的质量流率可以变化,而来流温度与可利用的余热流率Q_ab=Q（12）不变(下角ab表示余热流从状态a变至b时在换热Ⅰ中传给中间介质的热率;下角12表示中间介质自状更多还原

【Abstract】 In this article, an equivalent energy quality degradation δΩ and an equivalent absolute temperature Teq are derived as the thermodynamical criteria to select four different approaches of waste heat utilization, based on the principle of balance for energy quality. Besides the pure heating approach, the presence of optimum evaporation temperature of intermediate medium ts,opt for other three utilizable approaches is established (corresponding to δΩ minimized) through physical cases and the inversion temperature tinv, which gives judgement on the property of utilizahle approaches for equipments of pure power and back pressure turbine, is calculated out under certain conditions.更多还原