Feed water pump turbine steam exhaust waste heat recovering and recycling system

Abstract

A feed water pump turbine steam exhaust waste heat recovering and recycling system comprises a big turbine, an air cooling island or a condenser, a high back pressure condenser, a small feed water pump turbine, a steam increase machine, a steam increase machine condenser and a steam exhaust lead-out system. A lower pressure cylinder steam discharging pipeline of the turbine is connected with the air cooling island or the condenser. Through the steam exhaust lead-out system, steam exhaust is led out to enter the steam side of the high back pressure condenser. An exhaust steam branch of the small feed water pump turbine is connected with a pumping steam inlet of the steam increase machine. Exhaust steam of the steam increase machine enters the steam side of the steam increase machine condenser. The water side of the steam increase machine condenser is connected with the water side of the high back pressure condenser for water output. Back pressure decoupling of the big turbine and the small turbine is achieved, and the operation problem of the small feed water pump turbine is solved, equipment does not need to be modified; the adaptability of a heat supply system becomes more complete; and the waste heat recovering and recycling system can achieve operation and switching under different working conditions at the same time.

Description

technical field

[0001] The invention belongs to the field of energy saving of power plants, and in particular relates to a waste heat recovery and utilization system of a feedwater pump steam turbine based on a steam booster. Background technique

[0002] In order to reduce the loss at the cold end of thermal power plants or thermal power plants and save energy, some power plants have changed the unit (air-cooled or water-cooled unit) into a high back pressure operation unit. For example, the direct air-cooling unit of a certain power plant originally designed to operate at a back pressure of 15KPa.

[0003] Its working principle is to use the exhaust steam extraction system to draw out a part of the exhaust steam (such as 60%) of the steam turbine, and transport it to the high back pressure condenser through the pipeline, raise the back pressure of the steam turbine to operate, and the high back pressure condenser is used as heating device application, used to heat the ret...

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