为进一步提高蒸汽热量利用率、降低能耗及循环水用量，开展了有机朗肯循环发电耦合技术回收多效蒸发末效乏汽潜热利用技术研究，借助建模仿真手段对该工艺进行分析。结果表明，净发电量（热电转换效率）随着冷凝温度的降低而升高、随着工质泵出口压力的增大而升高，且不同有机工质的效率存在差别。以国内某氧化铝厂一组蒸发系统末效乏汽数据为基础，乏汽流量为55 t/h （温度63℃，压力20 kPa）、冷凝温度为20℃、工质泵压力增量为0.25 MPa时，净发电量为2 309 kW。

In order to further improve the heat utilization rate of steam, reduce consumption of energy and circulating water, the technology for recovering latent heat of the final-effect spent steam, which comes from multi-effect evaporators, by using organic Rankine cycle power generation technology are researched by means of modeling and simulation means.It is found that the net power generation (thermoelectric conversion efficiency) increases with descending condense temperature and elevating outlet pressure of the refrigerant pump.There are differences in the efficiency of different organic working fluids.Based on the final-effect spent steam data of a group of evaporation systems in one certain Chinese alumina plant, the net power generation can reach 2, 309 kW by using this process when the flow of spent steam with a temperature of 63℃ and a pressure of 20 kPa is 55 t·h^-1, the condense temperature is 20℃, and the pump pressure increment is 0.25 MPa.

宋二伟(1989-),男,博士,工程师,研究方向为化工过程技术开发、余热回收利用,songerwei15@mails.ucas.ac.cn。