基于燃煤电厂烟气低温余热资源，采用ORC(有机朗肯循环)设计发电系统，选择3种有机工质（R245fa、R600a和R601a），分析了该系统的热力学性能及技术经济性，并计算了该系统的节能减排效益。结果表明：工质的临界温度越低，系统的净输出功率越大；在计算排烟温度范围内（60~110 ℃），系统净输出功率先增大后减小，而发电效率随排烟温度升高而增大；采用ORC发电技术回收低温余热，节能减排效果显著。研究结果对ORC发电技术的工程应用具有一定的指导意义。

To better utilize the flue gas waste heat in a coal-fired power plant,an organic Rankine cycle was adopted for the power generation system,and three different working fluids (R245fa,R600a,and R601a) were selected to study the thermodynamic properties,technical economy,and the energy saving benefits of the system. The results showed that the lower the critical temperature of the working fluid,the greater the net output power of the system. With the exhaust gas temperature in the range of 60~110 ℃,the net output power increases first and then decreases as exhaust gas temperature increases,while the power generation efficiency increases with the exhaust gas temperature. The energy saving is remarkable when the organic Rankine cycle is used for waste heat recovery. These results are believed to be of importance in providing guidance on engineering applications of organic Rankine cycle power generation technology.

TK115