Abstract
The external flow field of a 600MW air-cooled unit is numerically simulated based on FLUENT. The distribution law of air flow field of air-cooled unit under different wind speed and wind direction conditions is studied. The influence of wind speed and wind direction on the heat transfer performance of air-cooled unit is analyzed. Predict the exhaust pressure of direct air-cooled unit under the influence of environmental wind. The results show that in the +X direction environmental wind, the first row of air-cooled unit on the windward side is prone to backflow; in the +Y direction environmental wind, the first row of air-cooled unit on the windward side is prone to hot air recirculation. As the wind speed increases, the heat transfer efficiency of the air-cooled unit decreases. The dominant wind direction (WNW) environmental wind has the least impact on the heat transfer efficiency, and the furnace wind (+Y direction wind) has the greatest influence on the heat transfer efficiency. To improve the heat transfer performance of the air-cooled unit under windy conditions, it is necessary to narrow the range of the negative pressure zone below the air-cooled unit and increase the cooling air flow rate of the air-cooled unit.
Highlights
Under the constraints of water resources, direct air-cooled units have developed rapidly in areas where China is rich in coal and short in water [1]
Zhou Lanxin et al [12] carried out numerical simulation on the external flow field of air-cooled platform, analyzed the influence of different wind speeds on the heat transfer efficiency of direct air-cooled unit, the causes of air backflow and hot air recirculation on the edge of aircooled platform, and exploring measures to improve heat transfer efficiency of air condensing steam turbines
Research shows that Increasing the height of the aircooled platform and the windshield can effectively reduce the influence of hot air reflow on the air condenser .Gao [16] simplified the air-cooling unit into the flow domain of the cube, and studied the effects of wind speed, wind direction and air-cooled platform height on the heat transfer performance of the air-cooled unit
Summary
Under the constraints of water resources, direct air-cooled units have developed rapidly in areas where China is rich in coal and short in water [1]. Zhou Lanxin et al [12] carried out numerical simulation on the external flow field of air-cooled platform, analyzed the influence of different wind speeds on the heat transfer efficiency of direct air-cooled unit, the causes of air backflow and hot air recirculation on the edge of aircooled platform, and exploring measures to improve heat transfer efficiency of air condensing steam turbines. Research shows that Increasing the height of the aircooled platform and the windshield can effectively reduce the influence of hot air reflow on the air condenser .Gao [16] simplified the air-cooling unit into the flow domain of the cube, and studied the effects of wind speed, wind direction and air-cooled platform height on the heat transfer performance of the air-cooled unit. Predict the exhaust pressure of the direct aircooled unit under the influence of environmental wind
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