论文部分内容阅读
针对有机物工质物性在近临界区的奇异性,选用了适用于近(亚)临界有机物朗肯循环(ORC)的3种典型工质:R236fa、R142b、R152a,建立热力学模型分析近临界循环与亚临界循环在性能上的差异,并从工质物性角度分析产生差异的原因。结果显示近临界循环的各项性能参数与亚临界循环差异明显;近临界ORC的比吸热量、比净功和热效率随蒸汽发生温度的变化缓慢,具有良好的变工况性能;这3种工质中干性工质R236fa最适用于近临界ORC。近临界ORC性能上的奇异性主要与有机物工质的潜热和干湿性在近临界区的特性有关。
In view of the singularity of the physical properties of organic matter in the near-critical region, three typical working fluids (R236fa, R142b and R152a) suitable for near-critical organic matter Rankine cycle (ORC) were selected. The thermodynamic model was established to analyze the near- Subcritical cycle in the performance of the differences, and from the physical point of view of the quality of the difference between the reasons. The results showed that the performance parameters of the near-critical cycle were significantly different from those of the subcritical cycle. The specific heat capacity, specific work efficiency and thermal efficiency of the near-critical ORC varied slowly with the steam temperature, and had good performance under varying conditions. Working medium refrigerant R236fa most suitable for near-critical ORC. The singularity of near-critical ORC properties is mainly related to the latent heat and dry-wetness of organic matter in the near-critical region.