Air-cooling system and heat transfer coefficient prediction method of air-cooled condenser for combined refrigeration power station with steam leakage from steam turbine shaft seal and boiler continuous blowdown and waste heat

An air-cooled condenser and shaft seal steam leakage technology, which is applied in steam/steam condensers, refrigerators, refrigeration components, etc. The problem of high temperature difference can reduce the amount of ash, improve the power generation efficiency, and reduce the exhaust pressure.

CN105423772BActive Publication Date: 2017-05-17NORTHEAST DIANLI UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-05-17

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Abstract

The invention discloses a power station air cooling system adopting combined refrigeration with shaft seal steam leakage of a steam turbine and continuous blow-down waste heat of a boiler. The system is characterized in that the steam turbine is communicated with a steam source, the steam turbine is connected with an electric generator, and the steam turbine is sequentially communicated with an air-cooling condenser, a condensate pump and boiler feedwater; the steam turbine is sequentially communicated with a steam leakage condenser, a steam leakage condensate pump and the boiler feedwater; boiler blow-down water is sequentially communicated with a flash tank, a deaerator, a working medium superheater and a drainage ditch; the steam leakage condenser is sequentially communicated with the working medium superheater, and a generator is communicated with the steam leakage condenser through a working medium circulating pump; the generator is sequentially communicated with a condenser, a first throttling valve and an evaporator, the evaporator is communicated with an absorber, and the generator is sequentially communicated with a second throttling valve, the absorber, a solution pump and a generator; and air is sequentially communicated with the evaporator, an induced draft fan and the air-cooling condenser. A method for predicting a heat-transfer coefficient of the air-cooling condenser is further provided.
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Description

technical field

[0001] The invention relates to the technical field of steam turbine exhaust air cooling in a thermal power station, and relates to an air cooling system of a steam turbine shaft seal combined with waste heat from boiler continuous sewage discharge and a heat transfer coefficient prediction method of an air-cooled condenser. Background technique

[0002] The thermal power unit whose exhaust steam of the steam turbine is air-cooled is called an air-cooled unit. According to the direct or indirect air cooling method, it is divided into a direct cooling unit and an indirect cooling unit. The cooling system is called a direct cooling system and an indirect cooling system. Among them, my country It is mainly based on direct cooling units. Due to its good water-saving performance, direct cooling units have been widely used in coal-fired power stations in my country's coal-rich and water-short Northeast, North China, and Northwest ("Three Norths") regions, although i...

Examples

Embodiment Construction

[0030] The present invention will be further described below using the drawings and specific embodiments.

[0031] refer to figure 1 , an embodiment of an air-cooling system for a steam turbine shaft seal combined with steam leakage and boiler continuous sewage waste heat combined refrigeration power station, which is characterized in that: it includes the steam inlet of the steam turbine 2 connected to the steam source 1, the steam turbine 2 is connected to the generator 3, and the steam turbine 2 The exhaust port 27 of the air-cooled condenser 18 communicates with the first input end of the air-cooled condenser 18, and the output end of the air-cooled condenser 18 communicates with the first input end of the boiler makeup water 22 through the condensate pump 21; The input end of the high temperature side of the condenser 4 is connected, and the output end of the high temperature side of the steam leakage condenser 4 is connected with the second input end of the boiler replen...