Thermal power generation system with function of exhaust steam recovery

Abstract

The invention discloses a thermal power generation system with the function of exhaust steam recovery, which belongs to the technical field of thermal power generation. The thermal power generation system comprises a boiler, a steam turbine, a generator, an exhaust-steam hot well, a closed pressure condensation tank, a centrifugal vapor compression machine and a membrane steam-water mix heater, wherein the boiler, the steam turbine and the generator are sequentially connected, and an exhaust steam outlet of the steam turbine is connected with the exhaust-steam hot well in which a water-spray cooling device is arranged; the condensed water discharged from the exhaust-steam hot well after sequentially passing through a hot-well condensate pump, the closed pressure condensation tank, a main condensate pump, the membrane steam-water mix heater, a water booster pump, a deaerator and a feed pump is fed into the boiler; and the exhaust steam discharged from the exhaust-steam hot well is divided into two parts after being pressurized by the centrifugal vapor compression machine, one part of exhaust steam is used for supplying heats for the outside, and the other part of exhaust steam is connected to the membrane steam-water mix heater to heat the condensed water. The thermal power generation system disclosed by the invention can recover huge amounts of thermal energies, and also can guarantee and stabilize the vacuum degree required by the steam turbine; and meanwhile, the problem of heat pollution caused by the exhaust steam of a cooling tower can be solved by using the thermal power generation system, and the water resource can be saved.

Description

technical field [0001] The invention relates to a thermal power generation system capable of recovering exhaust steam of a thermal power unit and effectively reducing the loss of latent heat of vaporization, belonging to the technical field of thermal power generation. Background technique [0002] The most basic thermal equipment in a thermal power plant includes boilers, steam turbines, condensers and water pumps. The cycle of working fluid in these devices is called "Rankine Cycle", which is the basic cycle of steam power plants. The water is heated to the saturation temperature in the boiler, then evaporated into saturated steam, and then heated into superheated steam by the heater; the superheated steam enters the steam turbine to expand and do work; exhausted steam that has done work is discharged into the condenser, and in the condenser After being cooled to release the latent heat of condensation, it becomes condensed water; the water pump sends the condensed water b...

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Problems solved by technology

[0003] For a long time, people have made unremitting efforts to reduce the loss of condenser cold source, but with little success. The problem of condenser cold source lo...

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