Method for calculating influence of environmental wind on thermal performance of ultra-large type natural draft cooling tower

Abstract

The invention discloses a method for calculating an influence of environmental wind on a thermal performance of an ultra-large type natural draft cooling tower. The method comprises the following steps of: according to a process size of the ultra-large type cooling tower, establishing a three-dimensional grid model of the ultra-large type cooling tower, according to a preset environmental wind boundary condition, setting an environmental meteorological program; calculating environmental air parameters and cooling water parameters of the cooling tower, importing the parameters to the environmental meteorological program; reading the grid model in a computational fluid dynamics software, compiling the environmental meteorological program; appointing a computational domain scaled by a water temperature as a thermal transfer mass transfer zone, and setting control parameters; initializing the computational domain, and obtaining a simulating calculation result by using a finite volume method. By using the method, an aerodynamic behavior and the thermal performance of the ultra-large type natural draft cooling tower under the environmental wind can be predicted, therefore, scientific evidence is provided for improving an air flow state and the thermal performance of the super-large type natural draft cooling tower.

Description

technical field [0001] The invention relates to a simulation design technology of a cooling tower, in particular to a calculation method for the influence of ambient wind on the thermal performance of a super-large natural draft cooling tower. Background technique [0002] Natural draft cooling tower is the most common heat exchange device in inland power plants. With the increase of thermal power unit capacity and the development of inland nuclear power, it is necessary to use super-large natural draft cooling towers to meet the increasing demand for heat exchange devices of units. Require. The water spraying area of ​​the wet cooling tower used in inland nuclear power plants reaches 2×10 4 ~3×10 4 , Its design size has been developed to a tower height of nearly 220m and a tower bottom diameter of nearly 185m, which is far larger than the design size of conventional cooling towers. For natural draft cooling towers, under the influence of ambient crosswinds, the axisymmet...

AI Technical Summary

Problems solved by technology

In comparison, there are relatively few studies on the influence of ambient wind on the thermal performance of cooling towers. The main reason is that the calculation of thermal performance of cooling towers involves fluid dynamics calculation problems such as multi-phase heat and mass transfer. Building a three-dimensional thermal performance calculation of cooling towers The model is more difficult

In the existing technology, the influence of ambient wind on the thermal calculation performance of natural ventilation cooling towers is analyzed through thermal model experiments. The thermal model needs to build a test bench, and its construction requires a lot of manpower and material resources, and the operation of the test bench also requires more time. Large power consumption, high cost

At the same time, physical models inevitably have scale effects, human measurement errors and systematic errors

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