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独立的抽汽冷却器是大型机组回热系统提高热效益的新技术。这项新技术为什么可以降低汽轮机组热耗?机组热耗可以降低多少?各级抽汽采用独立冷却器的效益如何?独立冷却器与高压加热器是串联还是并联好?对这些技术问题,本文应用熵增原理进行定性分析,并在定性分析的指导下,应用文献[2]提出的“循环函数”和“最佳分配方程”,对高压缸有无一级抽汽的两类30万千瓦机组热力系统,进行了20个方案的计算比较。综合这些分析比较,可以认为,过热度较高的回热抽汽采用串联的独立冷却器,适当加大该级给水焓升,是提高大型机组热效率、节约能源的有效措施。
An independent extraction cooler is a new technology that increases the thermal efficiency of large-scale unit regenerative systems. Why this new technology can reduce the steam turbine heat consumption? How much can the unit heat consumption be reduced? What are the benefits of using independent coolers for each level of extraction steam? Are the independent coolers and high-pressure heaters in series or in parallel? For these technical issues, Applying the theory of entropy increase, the paper analyzes the “circulation function” and “optimal distribution equation” proposed in [2] under the guidance of qualitative analysis, Unit thermal system, a calculation of 20 programs compared. Based on these analyzes and comparisons, it can be concluded that a higher degree of superheat recovery heat extraction using a series of independent cooler, appropriately increase the level of water enthalpy rise, is to improve the thermal efficiency of large units, energy saving effective measures.