侧风条件下带消能导流装置的直接空冷岛冬季冻结风险模拟研究

Hami power plant used a new type of "energy dissipation diversion device" in its air-cooling island to resist the crosswind influence and stabilize unit back pressure. However, the cooling tube bundle in the air-cooling unit of the power plant still freezed in winter. In order to explore the effect of the device on the anti-freezing of the air-cooling island in winter, the simulation research on the flow and heat transfer characteristics of air-cooling island and the freezing risk of each air-cooling unit under the winter gale condition was carried out by using the Fluent software. The research result shows that the " energy dissipation diversion device" of air-cooling island has a negative effect on anti-freezing of air-cooling unit integrally. Under the winter gale condition, the heat dissipation of the air-cooling units on the windward side of the device is about 27% higher than the warning value on average, with the maximum value of more than 50%. The " energy dissipation diversion device" mainly increases the heat transfer of the corresponding air-cooling unit by increasing the air velocity of the axial flow fan. The axial air velocity of the axial flow fan in the air-cooling units at the windward side of the device can even reach to the same level as the ambient crosswind, which leads to a surge of the heat exchange of corresponding air-cooling units, and makes it easier to be frozen. Under the strong wind conditions, the high-pressure area formed by the device under the air-cooling island is not evenly distributed. The high-pressure area near the main plant and adjacent air-cooling island has higher pressure and larger area, and the air-cooling units in these areas have higher freezing risk.