作　　者： ; ; ; ;

机构地区： 华南理工大学化学与化工学院传热强化与过程节能教育部重点实验室

出　　处： 《热能动力工程》 2011年第1期79-83,124-125,共5页

摘　　要： 分别以净发电效率和系统火用效率最大为目标,通过热力学分析,确定了两种不同余热类型发电系统候选工质的选择原则:热流量恒定余热应选择临界温度较高的工质,初温和质量流量恒定的余热应选择临界温度较低的工质。并定义了相应余热类型最佳工质主要评价参数α和β,数值大的工质性能较优。以两级烟气余热发电系统为例,采用Aspen Plus软件模拟计算验证理论分析结论。结果表明,第一级系统不同工质净功、参数α和火用损失随蒸发温度变化的趋势与理论分析结果完全吻合;第二级系统不同工质的净功、参数β和火用效率随蒸发温度变化趋势与理论分析结果也完全吻合。这表明,本研究提出的工质优选原则和方法是正确、可行的。 With the highest net power generation efficiency and systematic exergy efficiency serving as the targets respectively and through a thermodynamic analysis,determined were two principles for choosing a working medium for a power generation system with different types of waste heat: for waste heat with a constant heat flux,a working medium with a relatively high critical temperature should be chosen and for waste heat with a constant initial temperature and mass flow rate,a working medium with a relatively low critical temperature should be chosen.Moreover,the main parameters α and β for evaluating an optimal working medium for a corresponding type of waste heat were defined and the working medium with bigger values enjoys a better performance.With a two-stage flue gas waste heat power generation system serving as an example,the Aspen Plus software was used to simulate,calculate and verify the theoretically analytic results.The research results show that the variation tendency of the net power,parameter α and exergy loss of different working media in the first stage of the system with the evaporation temperature fully corresponds to the theoretically analytic results and so does that of the net power,parameter β and exergy loss of different working media in the second stage of the system.This indicates that the principles and methods for choosing an optimal working medium being proposed by the authors are correct and feasible.

关 键 词： 余热发电 低沸点工质 工质评价指标 热力学分析 流程模拟

领　　域： [动力工程及工程热物理]