Stagnant water discharging device used for air exhaust pipeline of condenser

Abstract

The invention discloses a stagnant water discharging device used for an air exhaust pipeline of a condenser. The stagnant water discharging device comprises the condenser provided with a hot well, the air exhaust pipeline, and an air exhaust device, wherein the two ends of the air exhaust pipeline are connected with an air exhaust port of the condenser and an air exhaust port of the air exhaust device respectively; the air exhaust pipeline is arranged transversely and horizontally; a stagnant water drainage pipeline is arranged between the air exhaust pipeline and the hot well; one end of the stagnant water drainage pipeline is communicated with the air exhaust pipeline by a through hole in the side wall of the air exhaust pipeline; the other end of the stagnant water drainage pipeline is communicated with the hot well by a connection through hole in the side wall of the hot well; the connection through hole is positioned in the side wall of the hot well, above a full water position of the hot well; and stagnant water in the air exhaust pipeline can be collected to the hot well by the stagnant water drainage pipeline. The stagnant water discharging device has the advantages that the stagnant water in the air exhaust pipeline can be discharged in a steam turbine operation process, without stopping a steam turbine.

Description

technical field [0001] The invention relates to the field of steam turbine power generation equipment, in particular to an accumulated water discharge device for removing accumulated water in an air extraction pipeline connected between a condenser and an air extraction device. Background technique [0002] During the power generation operation of the steam turbine, the hot steam generated by the boiler enters the steam turbine and expands to do work, so that the blades in the steam turbine rotate to drive the generator to generate electricity. The waste steam after the work is condensed by the condenser to form condensed water and then sent back to the boiler for recycling. . The condenser is a heat exchanger that condenses the exhaust steam of the steam turbine into water. There is a hot well for collecting condensed water at the bottom of the condenser. The condensed water formed by condensation in the condenser is collected in the hot well at the bottom of the condenser....

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Problems solved by technology

During the normal operation of the steam turbine, the suction pipe is the pipe connected with the condenser and the suction device, so the suction pipe is also a negative pressure vacuum environment with a pressure lower than atmospheric pressure. Once there is water in the suction pipe, the negative pressure Under the action, the accumulated water in the air extraction pipe cannot be discharged outwards, and the accumulated water in the air extraction pipe will accumulate more and more to form a blockage, resulting in a decrease in the vacuum degree in the condenser, resulting in a decrease in the exhaust pressure and temperature of the steam turbine. The exhaust pressure and temperature of the steam turbine cannot be controlled through remedial measures during the operation of the steam turbine. Even if the water level in the hot well is adjusted below the full water level, the accumulated water in the suction pipe cannot flow back through the hot well. In this way, the vacuum in the condenser cannot be restored to the normal negative pressure vacuum, which seriously affects the economy and safety of the steam turbine. When the negative pressure in the condenser is caused by the serious blockage of water in the suction pipe When the vacuum environment is lower than -60kpa, the steam turbine must be shut down for processing. Only after the suction pipe is disassembled can the accumulated water in the pipe be removed, and then re-welded and installed, the steam turbine can be restarted.

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