Plate-type evaporative condenser for direct air-cooling unit

Abstract

The invention discloses a plate-type evaporative condenser for a direct air-cooling unit. The plate-type evaporative condenser comprises corresponding pipelines, valves and the like. After low-pressure-cylinder zero-output heat supply reformation is performed on the direct air-cooling unit, the flow of steam entering the air-cooled condenser is significantly reduced; in order to prevent an air-cooling heat exchange tube bundle from freezing, an air-cooling island steam distributing pipe inlet valve can be switched off in low-pressure-cylinder zero-output heat supply operation of the direct air-cooling unit in the heat supply season, and exhaust steam of the unit flows back to a main unit thermal system after entering the plate-type evaporative condenser for condensation. The plate-type evaporative condenser can serve as a peak cooling system for the high-temperature and high-load section of the direct air-cooling unit in summer, and the purpose of reducing operation back pressure to save energy and reduce consumption is achieved.

Description

technical field [0001] The invention belongs to the fields of flexibility, energy saving and consumption reduction in thermal power plants, and relates to a plate type evaporative condenser applied to a direct air cooling unit. Background technique [0002] At present, the winter heating needs of residents in the "Three Norths" region are mostly borne by combined heat and power units, some of which are direct air-cooled units. Among the thermoelectric decoupling technologies of heating units, the transformation cost of low-pressure cylinder zero-efficiency heating technology is the lowest, the operation mode is flexible, the thermal economy is the best, and the comprehensive advantages are the largest. [0003] The zero-output heating technology of the low-pressure cylinder breaks the original theory of the minimum cooling flow limit of the low-pressure cylinder of the steam turbine, cuts off the inlet steam of the low-pressure cylinder during the heating period, and only ke...

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Problems solved by technology

[0004] The "Three North" region where the direct air-cooled cogeneration unit is located is located in the "Three North" region where the heating season is extremely cold and lasts for a long time. The condenser is bulky, and it is easy to freeze the heat exchange tube bundle under the condition of low temperature and low heat load, which seriously affects the safe and reliable operation of the unit

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