改进型Kalina海洋温差能发电循环模型的建立及热力性能分析

Study on the modle establishment and the thermal performance analysis of the modified Kalina cycle

文章以引入太阳能为辅热的海洋温差发电Kalina循环为基础,利用引射器对循环系统进行改进。对改进型Kalina循环系统的汽轮机进、出口压力和冷、热源温度进行分析,探究其对改进型Kalina循环系统的发电功率及热效率的影响。研究结果表明:改进后的Kalina循环具有较大的优越性,相比原Kalina循环,发电量增加了9%;系统的热效率随汽轮机入口压力的增大呈先增大后减小的变化趋势,并且热效率最大值可以达到9.45%;当热源温度较低时,较低的汽轮机入口压力会得到较高的热效率;当热源温度较高时,较高的汽轮机入口压力会得到较高的热效率。

A solar-assisted Kalina cycle of the ocean thermal energy conversion is simulated and the cycle is modified by introducing ejectors. The inlet and outlet pressure of the turbine, the temperature of the cold and heat source are examined to check their influences on the performance of the proposed cycle. The results illustrate that the power output of the modified cycle has increased by 9% compared with the Kalina cycle. Also, thermal efficiency of the proposed cycle increases firstly and then decreases as the inlet pressure of the turbine increases and it peaks at9.45%. Furthermore, when the temperature of the heat source is low, a higher thermal efficiency can be achieved under a lower inlet pressure of the turbine;When the temperature of the heat source is high, a higher thermal efficiency can be achieved under a relatively higher inlet pressure of the turbine.