摘要
为探究有机朗肯循环(organic Rankine cycle,ORC)系统中蒸发器的结构参数、运行参数等对系统回收余热经济性的影响,从火用回收角度,结合能源经济学,考虑设备初投资、资金的时间价值以及蒸发器全寿命周期内发生的费用,建立了以年净收益为指标的蒸发器热经济性评价模型;并基于该模型进行了算例计算和分析。研究发现,在ORC系统净回收火用量为正值的情况下,投资ORC余热回收项目的年净收益仍有可能为负值,表明单以净回收火用量为指标评价蒸发器性能的方法是不够准确的。ORC系统中存在某一最佳工况,使得系统运行的年净收益最大;当蒸发器换热面积为28 m2、有机工质流量为0.06 kg/s、余热烟气与有机工质质量流量比为7.8∶1时,系统获得最大年净收益约为14 650元/年。当系统运行参数偏离最佳工况时,将导致投资余热回收项目的年净收益大大降低甚至出现亏损。
In order to study the influence of structure parameters and operating parameters of evaporator on the thermal economy of waste heat recovery in Organic Rankine Cycle （ORC） system, from the perspective of exergy recovery, combined with the thermo-economic theory, which considered the initial investment of equipment, the time-value of fund and the costs of the evaporator in whole life cycle, an thermo-economic evaluation model with the annual net profit CNpv as an important criterion, was established for the evaporator. Based on the model, an example was calculated and analyzed. It is found that the annual net income of ORC waste heat recovery project may be negative when the net recycling exergy of ORC system is positive, which shows that a single evaluation method considering net recycling exergy as the only indicator is not accurate for the evaporator. There is an optimum condition in ORC system, in which the max annual net profit value can be reached. The highest annual net profit value （ about 14 650 yuan per year） can be achieved when the heat transfer area of the evaporator, the flow of organic working fluid and the mass flow ratio of flue gas and organic working fluid are 28 m2 , 0. 06 kg/s and 7.8, respectively. When the operational parameters deviate from the optimum condition, it will lead to the greatly decrease or even loss of the annual net profit of waste heat recovery project.
出处
《电力建设》
2013年第9期76-81,共6页
Electric Power Construction
