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Experimental Study of Condensate Subcooling with the Use of a Model of an Air-Cooled Condenser

机译：利用风冷冷凝器模型进行冷凝水过冷的实验研究

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摘要

Water-supply deficit is now felt in many regions of the world. This hampers the construction of new steam-turbine and combined steam-and-gas thermal power plants. The use of dry cooling systems and, specifically, steam-turbine air-cooled condensers (ACCs) expands the choice of sites for the construction of such power plants. The significance of condensate subcooling At as a parameter that negatively affects the engineering and economic performance of steam-turbine plants is thereby increased. The operation and design factors that influence the condensate subcooling in ACCs are revealed, and the research objective is, thus, formulated properly. The indicated research was conducted through physical modeling with the use of the Steam-Turbine Air-Cooled Condenser Unit specialized, multipurpose, laboratory bench. The design and the combined schematic and measurement diagram of this test bench are discussed. The experimental results are presented in the form of graphic dependences of the condensate subcooling value on cooling ratio m and relative weight content ε' of air in steam at the ACC inlet at different temperatures of cooling air t'_(ca). The typical ranges of condensate subcooling variation (4 ≤ Δt ≤ 6℃, 2 ≤ Δt ≤ 4℃, and 0 ≤ Δt ≤ 2℃) are identified based on the results of analysis of the attained At levels in the ACC and numerous At reduction estimates. The corresponding ranges of cooling ratio variation at different temperatures of cooling air at the ACC inlet are specified. The guidelines for choosing the adjusted ranges of cooling ratio variation with account of the results of experimental studies of the dependences of the absolute pressure of the steam-air mixture in the top header of the ACC and the heat flux density on the cooling ratio at different temperatures of cooling air at the ACC inlet are given.
机译：现在，世界许多地区都感到供水不足。这阻碍了新的蒸汽轮机以及蒸汽和天然气联合火力发电厂的建设。干式冷却系统的使用，尤其是蒸汽轮机风冷冷凝器（ACC）的使用，扩大了此类发电厂建设地点的选择。冷凝水过冷At作为对汽轮机厂的工程和经济性能产生负面影响的参数的重要性由此增加。揭示了影响ACC冷凝水过冷的运行和设计因素，从而正确制定了研究目标。所指示的研究是通过物理模型进行的，使用的是汽轮机风冷冷凝器单元专用的多功能实验室工作台。讨论了该测试台的设计以及组合的原理图和测量图。实验结果以冷凝物过冷值对冷却比m和ACC入口处蒸汽在不同冷却空气温度t'_（ca）下的空气中空气的相对重量含量ε'的图形依赖性的形式表示。根据ACC中达到的At水平和大量At降低的分析结果，确定冷凝水过冷变化的典型范围（4≤Δt≤6℃，2≤Δt≤4℃和0≤Δt≤2℃）。估计。规定了ACC入口处不同冷却空气温度下冷却比变化的相应范围。根据ACC顶部集管中蒸汽-空气混合物的绝对压力与热通量密度对不同冷却比的依赖关系的实验研究结果，选择冷却比变化的调整范围的指南给出了ACC入口处的冷却空气温度。

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