The concept of quality coefficient of equivalent exergy-drop is introduced to the article. θe can be used to judge the exergy-power conversion capacity of the exergy flows in the thermal equipment, thus determine their exergy unit price, and construct the thermal economic supplementary equation in the view of exergy-power conversion. This coefficient is used to calculate the exergy flow price of one 1 000MW unit thermal system, and the calculation results are compared with the results of Valero method and Energy quality coefficient method. This coefficient not only reflects the quality and price of exergy flows, but also takes the exergy-power conversion capacity of the thermal equipment into account, which makes exergy cost calculation more scientific and reasonable.%提出等效(火用)降品质系数θe的概念,根据θe的大小判断燃料(火用)流在各热力设备处的热量(火用)变功能力,进而确定其(火用)单价,从(火用)变功的角度合理构造了热经济学补充方程；利用该系数对某1 000MW机组热力系统进行了(火用)流的(火用)单价计算,并将计算结果与Valero方法、能质系数法进行了分析比较.该系数不仅体现了(火用)流的品质和价格,而且考虑到设备处的热量(火用)变功能力对(火用)成本的影响,使(火用)成本计算更科学合理.
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