Thermal power station operating process

FIELD: thermal engineering; power generation.

SUBSTANCE: proposed operating process of thermal power station is characterized in that full-flow condensate is heated in low- and high-pressure regenerative heaters by steam extracted from turbines and back-pressure steam is cooled down in circulating-water turbine condenser. Part of full-flow condensate is additionally heated in heat-pump plant condenser connected in parallel with low-pressure heater second along full-flow condensate path; circulating water heated in turbine condenser is used as low-potential heat source in heat-pump plant.

EFFECT: enhanced economic efficiency of thermal; power station.

1 cl, 1 dwg

 

The invention relates to the field of power engineering and can be used at thermal power stations.

Known equivalent ways of working of thermal power stations, for which the regenerative preheating of the main turbine condensate is in the regenerative heaters low and high pressure extraction steam turbine. The spent cooling steam produced by the circulating water, the warmth which disperses into the atmosphere (see the book Ejaculate "district Heating and heat networks". - M: Publishing house of MPEI, 2001, rib on s). This analog adopted as a prototype.

The disadvantage of analogs and prototypes is the low efficiency of thermal power plants due to the loss of heat removed from the condenser circulating water.

The technical result achieved by the present invention is to improve efficiency in thermal power plants by reducing the heat loss of the heated circulating water and improve the efficiency of the regenerative preheating of feedwater flow.

To achieve the technical result, a method of operating thermal power station, at which the main turbine condensate is heated in the regenerative heaters low and high pressure extraction steam turbine,the exhaust turbine the steam is cooled in the turbine condenser circulating water.

The difference of the proposed method of operating thermal power station is that part of the main turbine condensate is additionally heated in the condenser heat pump installation, included on a course parallel to the second main condensate regenerative heater low pressure, and as a low-grade source of heat in heat pump installation use heated in the turbine condenser circulating water.

New hallmark describing the method of operation of a thermal power station, allows you to increase the profitability of its operation.

Next, consider the information, confirming the ability of the invention to provide the above technical result.

The drawing shows a schematic diagram of thermal power station, explaining the proposed method.

Thermal power plant includes a steam boiler 1 steam turbine 2 to the capacitor 3 connected to the piping chilled 4 and heated 5 circulating water, and the pipeline of the main condensate turbine 6, which included condensate pump 7, and regenerative heaters low 8, 9, 10, 11, and high 12 pressure connected to the regenerative pair selections. The station is equipped with a heat pump system, consisting of a capacitor is 13, throttling device 14, an evaporator 15 and the compressor 16. On the cold side of the evaporator heat pump installation 15 included in the piping hot water circulation 5. In the heated environment, the condenser heat pump installation 13 included in the pipeline of the main condensate after the first 6 in the course of the condensation of the regenerative heater low pressure 8 parallel to the heater low pressure second stage 9.

The method of operation of a thermal power station consists of the following operations.

For realization of regenerative preheating of condensate in the exhaust turbine 2 steam the entire flow of feed water condensate pump 7 served in the regenerative heater low pressure first stage 8. Then feed water is divided into two streams, the heat which is produced in parallel using different operations. The first stream is heated by extraction steam turbine 2 in the regenerative heater low pressure second stage 9. The second stream is heated in the condenser of the heat pump unit 13 the heat taken away by the evaporator of the heat pump unit 15 from the heated circulating water from the pipeline 5. After this, the flow of feed water successively heated in the regenerative heaters low 10, 11 and high 12 pressures.

Thus, the proposed method of operating thermal power station allows isit profitability of its operation through efficient use of the heat of the heated circulating water in the regenerative system of the station.

The method of operation of a thermal power station, at which the main turbine condensate is heated in the regenerative heaters low and high pressure extraction steam turbine, the exhaust turbine the steam is cooled in the turbine condenser circulating water, characterized in that the part of the main turbine condensate is additionally heated in the condenser heat pump installation, included on a course parallel to the second main condensate regenerative heater low pressure, and as a low-grade source of heat in heat pump installation use heated in the turbine condenser circulating water.



 

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1 dwg

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1 cl, 1 dwg

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