Five configurations of regenerative Rankine cycle with two feed water heaters are compared in this paper. One configuration has two open feed water heaters (OFWH). The other four configurations have an open feed water heater placed before or after a closed feed water heater, which may be either closed feed water heater with drain pumped forward (FFWH) or closed feed water heater with drain cascaded Backward (BFWH). The five regenerative Rankine cycles are OFWH-OFWH, OFWH-FFWH, OFWH-BFWH, FFWH-OFWH, and BFWH-OFWH cycles. The optimum extracted steam fractions that result in the maximum thermal efficiency can be determined for each cycle. For a case study of Rankine cycle with the maximum steam pressure, temperature, and flow rate of 6 MPa, 450 °C, and 50.46 kg/s, respectively, the maximum efficiency of OFWH-OFWH cycle is 34.64%, and the net power output is 39.74 MW. The maximum efficiencies of the other four cycles increase with feed water heater area. They reach 34.64% when feed water heater areas of OFWH-FFWH, OFWH-BFWH, FFWH-OFWH, and BFWH-OFWH cycles are, respectively, 94, 138, 137, and 198 m². The installation costs of five cycles are also compared so that the condition under which each cycle has the lowest installation cost can be identified.

本文比较了两种给水加热器的蓄热式朗肯循环的五种配置。一种配置有两个开放式给水加热器 (OFWH)。其他四种配置在封闭式给水加热器之前或之后放置了一个开放式给水加热器，该给水加热器可以是具有向前泵送排水 (FFWH) 的封闭式给水加热器或具有向后级联排水 (BFWH) 的封闭式给水加热器。五个再生兰金循环是OFWH-OFWH、OFWH-FFWH、OFWH-BFWH、FFWH-OFWH和BFWH-OFWH循环。可以为每个循环确定导致最大热效率的最佳提取蒸汽分数。以最大蒸汽压力、温度和流量分别为 6 MPa、450 °C 和 50.46 kg/s 的兰金循环为例，OFWH-OFWH 循环的最大效率为 34.64%，净输出功率为39.74 MW。其他四个循环的最大效率随着给水加热器面积的增加而增加。当OFWH-FFWH、OFWH-BFWH、FFWH-OFWH和BFWH-OFWH循环的给水器面积分别为94、138、137和198 m时，它们达到34.64%² . 还比较了五个周期的安装成本，以便确定每个周期的安装成本最低的条件。