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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part E. Journal of Process Mechanical Engineering >Thermal and fouling characteristics of cross-flow wet cooling towers under mixed weather conditions
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Thermal and fouling characteristics of cross-flow wet cooling towers under mixed weather conditions

机译：混合天气条件下横流湿式冷却塔的热和结垢特性

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摘要

Cooling towers are widely used in most industrial units to reject waste heat to the environment. Wet towers are usually designed to operate in hot and dry weather conditions, but wet cooling towers operating in Ahvaz climate suffer from mixed weather conditions that strongly affect the thermal performance of the towers. Operating in mixed weather conditions and fouling on fills are two major concerns for towers working in the direct reduction unit of Khuzestan Steel Company (KSC), Ahvaz. The first step is to model the thermal behaviour of the tower under the present operating conditions. Two mathematical models (the conventional Merkel model and the dimensionless Halasz model) are applied in this step and the results of the models for the outlet water temperature in nine various operating conditions are compared with experimental data. Prevailing fill characteristic curves for three cell halves of the tower are obtained using a numerical-experimental method. At the second step, the results of the chemical analysis of fouling material and circulating water are considered to obtain the main factor of scale forming in the tower. The tendency of water to scale forming is investigated using three conventional scaling criteria. The analysis of water and fouling material shows that both air and water have important fouling and scaling effects on fills. Finally, several approaches are proposed to reduce these deteriorating effects of air and water. The effect of placing an impact separator in front of air louvers (to reduce suspended solids of the air) on the thermal performance of the tower is investigated.
机译：冷却塔广泛用于大多数工业设备中，以将废热排入环境。湿式冷却塔通常设计为在炎热和干燥的天气条件下运行，但在阿瓦士气候下运行的湿式冷却塔则受混合天气条件的影响，这会严重影响冷却塔的热性能。在混合气候条件下运行和填充物结垢是在阿瓦士Khuzestan钢铁公司（KSC）直接还原装置中工作的塔的两个主要问题。第一步是在当前运行条件下对塔的热行为进行建模。此步骤中应用了两个数学模型（常规的默克尔模型和无量纲的Halasz模型），并将在9种不同工况下的出口水温模型的结果与实验数据进行了比较。使用数值实验方法获得了该塔的三个单元的主要填充特征曲线。在第二步中，考虑结垢物质和循环水的化学分析结果，以获得塔中水垢形成的主要因素。使用三个常规的水垢标准研究水形成水垢的趋势。对水和结垢材料的分析表明，空气和水都对填充物有重要的结垢和结垢作用。最后，提出了几种减少空气和水的恶化影响的方法。研究了在空气百叶窗前放置冲击分离器（以减少空气中的悬浮固体）对塔架热性能的影响。

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