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Chlorine use reduction in nuclear or conventional power plants: a combined cooling-and-stripping tower for coastal power plants

机译:减少核电厂或常规电厂的氯使用量:用于沿海电厂的冷却塔和汽提塔组合

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Conventional seaside nuclear or coal-fired power stations draw water directly from the sea, chlorinate it and send it into a "once-through" cooling circuit that discharges it directly back into the sea. This practice leads to a constant input of thermal and chemical pollution (residual chlorine and chlorination by-products) into ecosystems in the immediate vicinity of the power plant. To reduce chlorine usage and achieve a cleaner process, a new design for the cooling system of power plants is proposed. This can be accomplished by means of a cooling-stripping tower that operates in a closed circuit. With that purpose in mind, the design of such a cooling system configuration was undertaken. Results show that the warm stream leaving the condensers at 38 ℃ cools down to 27.1 ℃ after exiting the cooling-stripping tower. This decrease in the seawater coolant temperature before it is rejected to the sea therefore prevents thermal pollution. Furthermore, the small amount of seawater returned to the sea at 27.1 ℃ contains no chlorination by-products. In addition, a dramatic reduction in the seawater intake by the cooling system is obtained, and represents only 5.2% of that needed by conventional systems. This, in turn, implies a reduction in the chlorine dosage and the filter sizes required for the seawater input stream. It is rec ommended that all power plants consider implementing the proposed design in order to prevent seawater pollution and damage to coastal ecosystems.
机译:传统的海边核电站或燃煤发电厂直接从海中抽取水,对其进行氯化处理,然后将其送入“一次通过”冷却回路,再将其直接排入海中。这种做法导致热力和化学污染(残留的氯和氯化副产物)不断输入电厂附近的生态系统。为了减少氯的使用并实现更清洁的工艺,提出了一种针对电厂冷却系统的新设计。这可以通过在封闭回路中运行的冷却塔实现。考虑到该目的,进行了这种冷却系统配置的设计。结果表明,离开冷凝器塔后,在38℃时离开冷凝器的暖流冷却至27.1℃。海水冷却剂在排入大海之前的这种温度降低可防止热污染。此外,在27.1℃下返回海水的少量海水中没有氯化副产物。此外,冷却系统的海水摄入量显着减少,仅占传统系统所需量的5.2%。反过来,这意味着减少了氯的用量和海水输入流所需的过滤器尺寸。建议所有电厂考虑实施建议的设计,以防止海水污染和对沿海生态系统的破坏。

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