Air cooling area arrangement method of condenser with large length-diameter ratio

Abstract

The invention relates to an air cooling area arrangement method of a condenser with a large length-diameter ratio. The method comprises the following steps that (1) the partial areas, close to tube plates at the two ends, of partial or all heat exchange tubes are surrounded by baffles to form two air cooling areas, and the air cooling areas are positioned at the lower part of the condenser; an exhaust pipe is arranged in each air cooling area and is used for extracting a gas-steam mixture in the condenser outwards; (2) the two side edges of the baffles are in sealed connection with the inner walls of the tube plates and middle partition plates respectively, and the other two side edges of the baffles are spaced from the inner wall of a circumferential shell of the condenser; (3) an air exhaust area separated by an inner baffle is arranged in each air cooling area, and the exhaust pipes downwards extend into the condenser from the top of a condenser shell and is communicated with the air exhaust areas; and (4) a distance is kept between the periphery of each middle partition plate and the inner wall of the circumferential shell of the condenser. The condenser manufactured according to the method is high in heat exchange efficiency, low in energy consumption and low in manufacturing cost.

Description

technical field [0001] The invention relates to a condenser for condensing exhaust steam of a steam turbine, in particular to an arrangement method for an air-cooling area of ​​a condenser with a large length-to-diameter ratio (greater than 3). Background technique [0002] Because of the need to maintain the vacuum, the condenser is equipped with a certain number of tubes (ie heat exchange tubes) to cool the pumped gas-vapor mixture so as to establish a lower suction temperature for the vacuum equipment to obtain a predetermined suction pressure. The steam flow guided into the condenser flows smoothly to both ends of the heat exchange tube and cools down, thereby reducing the steam exhaust resistance of the steam turbine and maintaining the operating pressure of the condenser. These number of heat exchange tubes are also called air-cooling tubes, which are used to cool the gas-vapor mixture to be extracted, and the area where the air-cooling tubes are arranged in the conden...

AI Technical Summary

Problems solved by technology

For a condenser with a large length-to-diameter ratio, this structure has a longer air-cooling area and more baffles in the air-cooling area, which will cause the condenser to have insufficient suction capacity under the specified suction capacity, and the exhaust pressure ( That is, the inlet steam pressure entering the inlet of the condenser, or the condensation pressure of the condenser) exceeds the design value, or in order to maintain the normal inlet steam pressure of the condenser, a larger-capacity extraction device is configured, thereby generating more energy consumption

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