Air-cooled steam condensing system with natural ventilation and direct water film evaporation

Abstract

The invention relates to an air-cooled steam condensing system with natural ventilation and direct water film evaporation, which comprises a natural ventilation cooling tower and a direct water film evaporation type air-cooled cluster steam condenser arranged above the water pool of the cooling tower. Waste steam from a steam turbine flows through the tube of the steam condenser to release heat so as to be condensed into water to be discharged; and spray water forms a water film outside of the tube, flowing air sweeps the water film, and the water film absorbs the heat of the waste steam in the tube and transmit sensible heat and the latent heat generated in the evaporation of the water film to the flowing air. The spray water then falls into the water pool of the cooling tower, and is delivered to a spray water distribution device above each tube bundle of the steam condenser by a circulating pump. The system consumes a certain amount of evaporated water, thereby significantly improving the heat cycling efficiency. No fan is applied to consume power, thereby reducing the service power. Moreover, the system can overcome the defect that the direct dry-air-cooled steam condensation can not be completed and realized in the high-temperature environment. Compared with the water-cooled steam condensation, the system can obtain a steam condensation temperature lower than the water-cooled steam condensation, achieve higher heat cycling efficiency, and significantly reduce water consumption. Therefore, the system is applicable to areas with abundant water resources but stricter and stricter water-saving requirements.

Description

technical field [0001] The invention relates to a steam power cycle system of a thermal power plant, a nuclear power plant, a self-contained power plant in a process industry, or a steam turbine generator set for waste heat power generation, and in particular to a condensing system that adopts natural ventilation and direct water film evaporation and air cooling. Background technique [0002] The steam power cycle (also known as the Rankine cycle) of thermal power, nuclear power and other steam turbine generator sets converts steam heat energy into mechanical energy, and then converts mechanical energy into electrical energy. as attached figure 1 As shown, the area enclosed by the Rankine cycle line on the temperature-entropy diagram is the mechanical energy that can be converted and output by steam heat energy. The reason why it is called cycle is that the steam state has to go through the state cycle process of high temperature and high pressure steam → low temperature an...

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