Closed water cooling system with double-evaporative cooling pressure

Abstract

The invention discloses a closed water cooling system with a double-evaporative cooling pressure, which provides the closed water cooling system used in an air-cooled thermal power set. The closed water cooling system comprises a direct-current evaporating and cooling closed water chiller A, a direct-current evaporating and cooling closed water chiller B, a vacuum butterfly valve, a vapor injector A, a vapor injector B, five sections of steam extracting and entering regulating valve, a plant steam aiding and entering regulating valve, a NO. 8 low pressure heater, a condenser, a liquid level sensor and a DCS (distributed control system); pipe sides of the two direct-current evaporating and cooling closed water chillers A and B are connected in series; and an evaporating and cooling pressure at a casing side of B is lower than that of A, thus the problem that output power of a turbo generator set is limited by an overhigh temperature of closed water is solved, cooling conditions of a host machine and an auxiliary machine are improved, heat output by hot closed water is recycled as much as possible, and power consumption of the closed water system is lowered. By the adoption of the closed water cooling system, no wet-type mechanical ventilated cooling tower is needed for open circulated water cooling, the occupation area of the cooling tower is reduced, the investment on capital construction is reduced, the electricity consumption is decreased, and the water consumption is zero.

Description

(1) Technical field: [0001] The closed water cooling system with double evaporative cooling pressure of the present invention relates to a closed water cooling system used in an air-cooled thermal power unit. (two) background technology: [0002] The closed water used by thermal power units in the prior art is demineralized water in a closed cycle. The users of closed water used as a cooling medium include the hydrogen cooler of the turbogenerator, the internal cooling water cooler of the turbogenerator, and various Sealed water coolers for various water pumps, water-air coolers for various water pump motors on the turbine side, bearing coolers, bearing coolers for main oil pumps of small machines, working sealed water coolers for vacuum pumps, cat claw coolers for steam turbines, cooling of high-pressure main steam valves Cooler, medium pressure combined steam valve cooler, blower motor water-air cooler, control oil station cooler, primary fan motor water-air cooler, lubric...

AI Technical Summary

Problems solved by technology

[0006] In order to build large-scale thermal power units in arid and water-scarce areas, the existing technology has developed air-cooled thermal power units (including direct air cooling and indirect air cooling). The water cooler provides open circulating water with a lower temperature. This design not only greatly increases the infrastructure investment, but also greatly increases the water consumption of the air-cooled thermal power unit.

Images