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首页> 外文会议>Air Waste Management Association's Annual conference Exhibition >Modeling Plume Rise and Dispersion from a Hybrid Natural Draft Cooling Tower
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Modeling Plume Rise and Dispersion from a Hybrid Natural Draft Cooling Tower

机译：杂交天然杂交冷却塔模拟羽毛升高和分散

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Natural draft cooling towers are commonly used at large coal-fired as well as nuclear power plants. In the standard configuration, combustion flue gasses are emitted through a separate, tall stack. In recent decades, a number of power plants have been built, most notably in Europe, that have used a hybrid combustion stack-cooling tower design. In this hybrid design, one or more combustion flues are embedded within a natural-draft cooling tower. This design is less costly because it does not require the construction and maintenance of a separate tall stack and it combines the buoyancy of the flue gas and the warm moist cooling tower plume, which enhances plume rise and dispersion. Standard U.S. EPA guideline models cannot be directly applied to the hybrid design because the thermodynamics of the moisture laden plume and large diameter of the tower are not addressed in the plume rise and dispersion parameterizations. A European model that has been developed to simulate dispersion of natural draft towers in flat terrain has been adapted to account for variations of the effective stack parameters with meteorological conditions and terrain influences that can be important in estimating ground-level impacts. The new model, ISC-HYBRID, simulates the dispersion of emissions from such a hybrid tower. ISC-HYBRID model results, as applied to a coal-fired power plant of hybrid design, are compared to impacts from a conventional, tall stack design that is modeled using the regulatory EPA ISCST model.
机译：天然冷却塔常用于大型燃煤和核电厂。在标准配置中，通过单独的高堆叠发出燃烧烟道气体。近几十年来，欧洲最符合的一些发电厂已经建造了混合燃烧堆叠塔设计。在这种混合设计中，一个或多个燃烧槽嵌入天然的冷却塔内。这种设计较低，因为它不需要施工和维护单独的高堆叠，它结合了烟气气体的浮力和温暖的湿润冷却塔羽流，这提高了羽流升高和分散。标准美国EPA指南模型不能直接应用于混合设计，因为在流量上升和分散参数化中没有解决水分升起羽毛和大直径的热力学。已经开发出用于模拟平坦地形中天然牵引塔的分散的欧洲模型已经适用于具有气象条件和地形影响的有效堆叠参数的变化，这在估计地面液位时可能是重要的。新型号ISC-Hybrid模拟了这种混合塔的排放分散。 isc-hybrid模型结果，应用于混合设计的燃煤电厂，与使用监管EPA iSCST模型建模的传统高层堆叠设计的影响。

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