For an advanced power plant of twin thermal power units sharing one dry cooling tower, power production is easily impacted by variations in cooling tower performance. Circulating cooling water pre-mixing (CCWPM) was proposed to maximize cooling potential of the tower under varying working conditions, thereby enhancing power generation for the whole power plant. An integrated simulation model was established to capture cooling behaviors of the shared tower and operating characteristics of both power units before and after implementing CCWPM. Simulation results indicated that CCWPM effectively mitigates the uneven distribution of airflow temperature inside the shared tower and reduces the high-temperature area. As power load of one specified unit drops, both units experience a decline in power cycle efficiency, and the implementation of CCWPM further decreases the efficiency of this unit while increasing the efficiency of the adjacent unit. The whole power plant benefits from CCWPM in power generation, particularly when the unit with radiators directly facing the crosswind operates at a low power load. Power generation efficiency achieves an absolute increase of 0.43 % via CCWPM for the upwind unit and its adjacent unit operating at 40 % and 100 % power loads and the shared tower working at 8 m/s crosswind speed.

中文翻译：

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循环冷却水预混改善共用一台干式冷却塔双机热力性能研究


对于共用一台干式冷却塔的双火电机组的先进发电厂来说，发电量很容易受到冷却塔性能变化的影响。循环冷却水预混合（CCWPM）的提出是为了在不同的工况下最大限度地发挥塔的冷却潜力，从而提高整个发电厂的发电量。建立了一个集成仿真模型来捕获实施 CCWPM 前后共享塔的冷却行为以及两台发电机组的运行特性。仿真结果表明，CCWPM有效缓解了共用塔内气流温度分布不均匀的问题，减少了高温区域。当一台指定机组的电力负荷下降时，两台机组的功率循环效率都会下降，CCWPM 的实施进一步降低了该机组的效率，同时提高了相邻机组的效率。整个电厂受益于CCWPM发电，特别是当散热器直接面向侧风的机组在低功率负荷运行时。通过CCWPM，逆风机组及其相邻机组在40%和100%功率负载下运行以及共享塔在8 m/s侧风速下运行时，发电效率绝对提高了0.43%。