Circulating water cooling system of power plant

Abstract

The invention discloses a circulating water cooling system of a power plant. The circulating water cooling system comprises a circulating water system and an ammonia refrigerating system, wherein thecirculating water system comprises a steam condenser, a water collecting tank, a circulating water pump, a cooling tower, a water separating tank and pipelines; the steam condenser, the water collecting tank, the circulating water pump, the cooling tower, and the water separating tank are connected through the pipelines; the ammonia refrigerating system comprises an evaporator, a compressor, a condenser, a liquid storage tank, an expansion valve and pipelines; the evaporator, the compressor, the condenser, the liquid storage tank, and the expansion valve are connected through the pipelines, and the pipelines are filled with liquid ammonia; the evaporator is arranged on a water outlet pipe of the cooling tower, an outlet of the compressor is connected with an ammonia inlet of the evaporator, and an ammonia outlet of the evaporator is connected with an inlet of the compressor; and the condenser, the liquid storage tank and the expansion valve are sequentially arranged on an ammonia inletpipe of the evaporator along the liquid ammonia flowing direction. The circulating water cooling system has the advantages that the ammonia refrigerating system is additionally arranged on the basisof the circulating water system, and cooling circulating water flowing out of the cooling tower is further cooled by the ammonia refrigerating system, so that tower outlet temperature of the cooling water is reduced to be lower, and the efficiency of a medium-pressure unit and a high-pressure unit is improved.

Description

technical field [0001] The invention relates to a cooling system, in particular to a power plant circulating water cooling system, and belongs to the technical field of power plant cooling. Background technique [0002] In the construction of thermal power plants, circulating water cooling system is essential. The existing circulating water cooling system of the power plant is mainly composed of a condenser, a water header tank, a circulating water pump, a cooling tower, a water distribution tank and pipes connecting them. The structure is as follows: figure 1 shown. Among them, the cooling tower is the key structure of the circulating water cooling system. [0003] The cooling performance of the cooling tower directly affects the economy of thermal power plant operation. The improvement of the thermal efficiency of the power plant is proportional to the decrease of the temperature of the cooling water exiting the tower. When the temperature of the cooling water exiting th...

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Problems solved by technology

[0005] However, the existing cooling tower uses natural ventilation to cool down. In the hot summer, the air temperature is high, and the cooling effect is difficult to guarantee.

[0006] In addition, the current power plant circulation cooling tower adopts an open structure. On the one hand, it causes evaporation loss of fresh cooling water. On the other hand, the cooling water of the open cooling tower is directly in contact with the atmosphere, which easily brings a large amount of impurities in the air into the circulation system. As a result, the pipes are severely corroded and scaled, and a large amount of scale inhibitors, corrosion inhibitors and other chemicals have to be added, which is not economical and will cause secondary pollution

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