烧结冷却烟气低温余热ORC系统建模与热经济性能

Modeling and thermal economic performance of low-temperature waste heat ORC system for sintering cooling fume

本文以烧结冷却烟气低温余热为有机朗肯循环(organic Rankine cycle,ORC)系统热源,建立超临界ORC系统热力和经济模型,并选取R134a为ORC工质,研究变温热源下膨胀机的进口温度和压力,以及工质冷凝温度对系统热经济性能的影响。研究结果表明:系统净输出功随膨胀机进口温度的增加而增加,随膨胀机进口压力和工质冷凝温度的增加而减小,但系统单位温度的传热量随之均减小。当系统热力参数一定时,热源进口温度越大,系统净输出功和单位温度的传热量越大。在实际操作过程中,存在适宜的热源进口温度和系统热力参数使得ORC系统获得较大的净输出功和较小的单位温度传热量。

The low-temperature waste heat of sintering cooling fume is used as the heat source of the organic Rankine cycle(ORC)system,the heat and economic model of the supercritical ORC system is established,and R134a is selected as the ORC working substance to study the influence of the inlet temperature and the pressure of the expander under the variable temperature heat source,as well as the condensing temperature of the working substance on the thermal economic performance of the system.The results show that the net output work of the system increases with the increase of the inlet temperature of the expander,and decreases with the increase of the inlet pressure of the expander and the condensing temperature of the working substance,but the heat transfer per unit temperature of the system decreases.When the thermal parameters of the system are constant,the larger the inlet temperature of the heat source,the greater the net output work of the system and the heat transfer per unit temperature will be.In the actual operation process,there are suitable heat source inlet temperature and thermal parameters of the system,so that the ORC system can obtain a larger net output work and a smaller heat transfer per unit temperature.