中文摘要：

介绍并研究一种能对中高温热源进行梯级利用的双压力蒸发卡林纳循环（DPV—KC）。通过工程计算软件EES对循环系统进行理论分析，得出双压力蒸发卡林纳循环的工作浓度和基本浓度的选取对循环系统参数及动力回收效率的影响规律以及两者的最佳匹配关系。在热源温度400℃、冷却水温度25℃，并限制最高压力不大于20MPa，热源最低排放温度90℃条件下，最佳方案为工作浓度0．45、基本浓度为0．272，第一蒸发压力对应的露点温度为300℃，此时双压力蒸发卡林纳循环的动力回收效率‰可达到27％，比选取最佳参数的卡林纳循环提高17％。

英文摘要：

A dual-pressure vaporization Kalina cycle （DPV-KC） for cascade utilization of high-to-mid temperature heat resource is introduced and investigated. The calculation was completed using the engineering calculation software EES. The impacts of the selections of the work concentration and basic concentration on the parameters and power recovery efficiency of the cycle and their optimum relationship were clarified. Under the conditions of inlet temperatures of heat resource and cooling water are 400 ℃ and 25 ℃, respectively, the maximum pressure is 20 MPa and the lowest exhaust temperature of heat resource is 90℃, the optimum work concentration and basic concentration are 0.45 and 0.272, respectively, the dew point temperature of evaporation is 300 ℃, and the corresponding power recovery efficiency of the DPV-KC reaches 27%, which is 17% higher than that of the Kalina cycle with optimum parameters.