摘要
本文提出新Kalina循环即一次抽汽回热式KCS34和分级抽汽回热式KCS34,根据热力学第一定律和第二定律,利用EES软件仿真模拟对该循环进行热力性能分析,并与基本KCS34进行相同条件下的性能对比,研究了抽汽压力、透平进口压力和透平进口温度变化对一次抽汽回热式KCS34性能的影响。研究结果表明:额定工况下,一次抽汽回热式KCS34的热效率为12.33%,比基本KCS34高0.35%;效率为46.07%,比基本KCS34高1.35%。且与一次抽汽回热式KCS34相比,分级抽汽回热式KCS34热效率高0.13%,效率高0.49%。另外,抽汽压力增加,一次抽汽回热式KCS34发电量和效率逐渐降低,热效率在10bar时达到最大;随着透平进口压力增加,一次抽汽回热式KCS34热效率逐渐增加,发电量和效率在30.79 bar时达到最大;随着透平进口温度增加,一次抽汽回热式KCS34热效率逐渐、发电量和效率都增大。
The single-stage regenerative KCS34 and the double-stages regenerative KCS34 were proposed, and they were simulated by using of the EES software. The performance of the proposed cycles had been evaluated by the first and second law of the thermodynamics. The comparison had been conducted between the proposed cycles and the basic KCS34. The parametric study had also conducted to investigate the influences of the main parameters such as extracting steam pressure, the inlet pressure of turbine and the inlet temperature of turbine on the performance of the single-stage regenerative KCS34. The simulated results indicate that the thermal efficiency and the exergy efficiency of single-stage regenerative KCS34 are 12.33% and 46.07%, increased by 0.35%, 1.35% in comparison with basic KCS34, respectively, under the rated conditions. Furthermore, the thermal efficiency and exergy efficiency of double-stages regenerative KCS34 are higher 0.13%, 0.49% than that of single-stage regenerative KCS34, respectively. The parametric study indicates that the power output and exergy efficiency of single-stage regenerative KCS34 decreases as extracting steam pressure increases, and the thermal efficiency reaches the maximum value when the extracting steam pressure is lobar. It is also found that the thermal efficiency of single-stage regenerative KCS34 increases as the inlet pressure of turbine increases and the power output and exergy efficiency reaches the maximum value when the inlet pressure of turbine is 30.79bar. Besides, the thermal efficiency, the power output and the exergy efficiency of single-stage regenerative KCS34 can be improved by increasing the inlet temperature of turbine.
