Once-through cooling water supply system of steam turbine capable of being subjected to extraction condensing and back pressure operation

Abstract

The invention provides a once-through cooling water supply system of a steam turbine capable of being subjected to extraction condensing and backpressure operation, and relates to the field of once-through cooling water supply. The once-through cooling water supply system comprises a circulating water pump room, a water supply pipeline, a water drainage pipeline, a first extraction condensing unit condenser, a second extraction condensing unit condenser, a third extraction condensing unit condenser and a fourth backpressure unit auxiliary machine cooler. The water supply pipeline comprises a first water supply pipe and a second water supply pipe which are connected with the circulating water pump house, and a water supply connecting pipe is connected between the two water supply pipes; the drainage pipeline comprises a first drainage pipe and a second drainage pipe, and a drainage connection pipe is connected between the two drainage pipes; the first water supply pipe and the first drainage pipe are connected with a first extraction condensing unit condenser. The second water supply pipe and the second drainage pipe are connected with a second extraction condensing unit condenser. The second water supply pipeline and the second drainage pipe are further provided with reserved pipe connectors respectively, and the reserved pipe connectors are used for being connected with a third extraction condensing unit condenser and a fourth back pressure unit auxiliary machine cooler.

Description

technical field [0001] The invention relates to the technical field of once-through cooling and water supply, in particular to a direct-flow cooling water supply system capable of pumping condensation and back-pressure running steam turbines. Background technique [0002] The once-through cooling water supply system is a common power plant turbine cooling system. The once-through cooling water supply system uses seawater (fresh water) as the cooling medium, and is directly discharged after the one-time cooling by the heat exchange equipment. [0003] In the design of the DC cooling water supply system, the water supply pipelines mostly adopt the traditional branched water supply method, and the pipelines are connected to form a water supply system by using fittings such as tee, large and small heads and elbows. This method has disadvantages such as unstable water pressure and uneven water distribution. . Moreover, because there are many accessories on the long process pipe...

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Problems solved by technology

[0006] In order to solve the above problems, the object of the present invention is to provide a direct-flow cooling water supply system for steam turbines capable of extracting condensate and back-pressure operation, so as to solve the problem of poor water distribution uniformity, unstable outlet water pressure, and pipeline fittings in the existing direct-flow cooling water supply system. The problem of high quantity and poor economy of the whole system

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