中文摘要：

以扩容式地热与槽式太阳能联合发电系统为研究对象,对其太阳能集热器出口温度进行了估算,得到最佳出口温度。建立了联合发电系统发电效率、度电耗地热水量、总发电量、发电增量比以及太阳能利用分数等指标的评价模型。应用Aspen Plus软件建立了基于西藏羊八井电站扩容式地热发电系统的槽式太阳能联合发电系统模型,并采用Aspen Plus软件的灵敏度分析和优化工具对系统主要参数进行了模拟计算,得到两级扩容器的最佳扩容温度,并可用于系统的扩容器优化。优化后的系统发电功率为4 044.5kW,发电效率为13.1%,度电耗热水量为94kg/（kW·h）,汽耗率为9.2kg/（kW·h）,太阳能利用分数为58.1%,发电增量比为30.0%,各项热力性能均有显著提高。

英文摘要：

Taking the capacity-expanded geothermal and trough type solar power combined generation system as the research object,the temperature at outlet of the solar energy collector was estimated to obtain the optimum outlet temperature.Evaluation models for such indexes as generation efficiency,the increasing ratio of power generation capacity and solar energy utilization fraction were set up to analyze the thermal performance of this system.By applying the Aspen Plus software,the geothermal-solar energy combined power generation system model for the Yangbajing geothermal power station in Tibet was established.Moreover,sensitivity analysis and optimization tool were used to calculate major parameters of this system,to obtain the best capacity expansion temperature,which is helpful to the system＇s capacity espansion.The results show that,after the optimization,the generation power of the system was 4 044.5kW,the generation efficiency was 13.1%,the hot water consumption was 94kg/（kW·h）,the steam consumption rate was9.2kg/（kW·h）,the solar energy utilization percentage was 58.1%,and the power generation increment ratio was 30.0%.Each performance index of the system enhanced significantly.