Antifreeze system and cooling water temperature control method for natural ventilation cooling tower

Abstract

The invention discloses an anti-freezing system of a natural draft cooling tower and a cooling water temperature controlling method. The anti-freezing system of the natural draft cooling tower comprises a cooling tower body and a fin-tube type air-water heat exchange system. The fin-tube type air-water heat exchange system comprises air deflectors, fin-tube type air-water heat exchangers, louver type adjusting dampers and a temperature monitoring module. The air deflectors divide an air intake cavity into air heater areas and non-heating areas which are alternate. The fin-tube type air-water heat exchangers are arranged in the air heater areas, and the heat ends of the fin-tube type air-water heat exchangers are connected with a heat cycle water phase of a steam condenser of a steam turbine generator set through water inflow adjusting valves. Air inlets of each air heater area and each non-heating area are both the louver type adjusting dampers controlled by drive motors. The temperature monitoring module comprises an air temperature sensor and a cooling water temperature sensor. The anti-freezing system of the natural draft cooling tower effectively solves the anti-freezing safetyproblem in cold seasons of the natural draft cooling tower and enables the outlet water temperature of the cooling tower to be controlled according to the optimal parameters of cold end optimized operation of the set, and therefore the environmental resources are fully utilized to improve the economical efficiency of set operation.

Description

technical field [0001] The invention relates to a closed circulation cooling water system of a steam turbine generator set, in particular to a natural ventilation cooling tower antifreeze system and a cooling water temperature control method. Background technique [0002] The natural ventilation cooling tower of the closed circulation cooling water system of the turbogenerator set, the hot circulating water from the condenser is sent to the water distribution system in the tower, and the water distribution system distributes the hot circulating water to each water distribution tank, and sprays it through the sprinkler. Drenched into small water droplets, sprinkled on the filler to form a water film, water and air contact, on the one hand, water molecules continue to evaporate to the unsaturated air, resulting in evaporative cooling, thereby reducing the water temperature; on the other hand, heat exchange occurs between air and water, The temperature of the air rises and the ...

AI Technical Summary

Problems solved by technology

[0005] 1. In order to prevent freezing, the amount of cold air entering the cooling tower is reduced, so that the hot circulating water cannot be fully and effectively cooled, resulting in a high temperature at the outlet of the circulating cooling water, which cannot meet the normal operation requirements. On the one hand, it will cause the condenser The back pressure rises, affecting the normal output of the unit

In addition, it may also reduce the vacuum degree of the condenser, reduce the thermal efficiency of the cycle, increase the power consumption of the circulating water pump, reduce the output of the unit and affect the operating economy

[0006] 2. The canvas layer cannot flexibly adjust the air volume, and cannot meet the response adjustment under changing environmental conditions and load changing conditions

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