低温余热发电技术在煤化工项目上的应用

Application of the power generation technology using low temperature waste heat to coal chemical industry project

研究了采用有机朗肯循环(ORC)的低温余热发电技术。为了有效利用煤化工项目的低温凝液余热资源,在计算工艺凝液余热容量的基础上确定了合理的ORC余热利用方案,利用ORC余热发电机组代替原有的循环水冷却器,以便在完成对工艺凝液冷却的同时实现余热资源发电收益。分析结果表明:该余热发电项目的净发电功率为516k W,节约原有冷却塔循环水泵消耗的功率为110k W,年收益电量达500.8万度,年节约标准煤1812.4吨。

The power generation using low temperature waste heat based on organic Rankine cycle （ORC） was studied. To effectively use the low temperature waste heat of a coal chemical project, a scheme for correct use of ORC waste heat was determined after computing the heat capacity of the low temperature condensation liquid, and the ORC generating unit was used to replace the original water-cooling tower so as to achieve the generation of electricity while cooling the condensation liquid. The analysis of the generation shows that the net generation power of this project is 516kW, the saved energy-consumption power of the circulating pump of the cooling tower is 110kW, and the annual electricity production is 5. 008 million kilowatt-hours, which means 1812.4 tons of standard coal a year.