RU2365769C1 - Mode of operation of thermal electric power plant - Google Patents

Abstract

FIELD: heat and power engineering.

SUBSTANCE: invention relates to heat and power engineering field. In steam boiler it is produces direct steam, which is fed into cogeneration steam turbine. By bottom and top heating sampling of turbine's steam it is heated delivery water in bottom and top network heaters. Makeup water of heating system is deaerated in deaerator, after what it is fed into return network pipeline before bottom network heater. Deaerated makeup water before feeding into return network pipeline is cooled in superficial heat exchanger-cooler by reduced natural gas, than heated gas is fed into burners of steam boiler.

EFFECT: invention provides increasing of efficiency of heat station.

1 dwg

Description

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

A similar analogue is known - the method of operation of a thermal power plant, in which sharp steam is generated in a steam boiler, which is supplied to a cogeneration steam turbine, the lower and upper heating taps of a steam turbine heat the network water in the lower and upper network heaters, the heating water is deaerated in the deaerator, after which is fed into the return network pipe in front of the lower network heater. (A.A. Ionin, B.M. Khlybov, V.N. Bratenkov, E.N. Terletskaya, Heat supply: A textbook for universities. / Ed. By A.A. Ionin. - M: Stroyizdat, 1982. - 336 S., p.274.) This analogue is adopted as a prototype.

The disadvantage of analogue and prototype is the reduced efficiency of a thermal power plant. So, a consequence of the high temperature of the mixed flows of make-up and return network water supplied to the network heaters is the high pressure and enthalpy of the heating steam of the lower and upper heating taps of the turbine, which in turn leads to a decrease in the generation of electric energy for heat consumption.

The technical result achieved by the present invention is to increase the efficiency of a thermal power plant due to the additional generation of electric energy for heat consumption.

To achieve this result, a method is proposed for operating a thermal power plant, in which steam is generated in the steam boiler, which is supplied to a cogeneration steam turbine, with lower and upper heating steam taps, the turbines heat the network water in the lower and upper network heaters, the heating water is deaerated in the deaerator and then served in the return network pipeline in front of the lower network heater.

The difference is that deaerated make-up water is cooled in the surface heat exchanger-cooler with reduced natural gas before being fed to the return network pipe, which is fed to the burners of the steam boiler, and the reduced natural gas pipe between the gas pressure reducing device and the make-up water heat exchanger-cooler is protected from heating with atmospheric air by thermal insulation.

The proposed method of operation of a thermal power plant allows to increase the production of electric energy for heat consumption by lowering the temperature of the make-up water, which leads to a decrease in the temperature of the mixed streams of make-up and network water supplied to the network heaters, and, as a result, to a decrease in the pressure and enthalpy of heating steam lower and upper heating taps of the turbine. The gas heated in the heat exchanger-cooler returns heat to the boiler furnace, thereby reducing fuel consumption for heating gas.

Next, we consider the information confirming the possibility of carrying out the invention with obtaining the desired technical result.

The drawing shows a schematic diagram of a thermal power plant operating according to the proposed method. The station contains a steam boiler 1, connected by a steam line of hot steam 2 with a heating turbine 3, connected via a heating medium to the lower and upper heating taps of the steam turbines lower 4 and upper 5 network heaters, connected via a heated medium to the network water pipe 6, deaerator 7, connected a deaerated make-up water pipe 8 to a network water pipe 6 in front of the lower network heater 4, a surface heat exchanger-cooler of a deaerated make-up water 9 included in the deaerated piping bath make-up water 8 between the deaerator 7 and the network water pipe 6, and in the cooling medium included in the gas pipeline of reduced natural gas 10 between the device for lowering the gas pressure 11 and the burners of the steam boiler 12.

The proposed method of operation of a thermal power plant is as follows.

The hot steam generated in the steam boiler 1 is fed through the hot steam pipe 2 to the heating steam turbine 3, the lower and upper heating steam taps of the turbine heat the network water in the lower 4 and upper 5 network heaters, the heating water is deaerated in the deaerator 7, after which it is piped deaerated make-up water 8 is fed into the return network pipe 6 in front of the lower network heater 4. Deaerated make-up water before being fed to the return network pipe 6 is cooled in surface heat heat exchanger cooler 9 with reduced natural gas, which is heated in the heat exchanger 9 with make-up water and then fed into the burners of the steam boiler 12. The gas pipeline of the reduced natural gas 10 between the gas pressure reducing device 11 and the make-up water heat exchanger-cooler 9 is protected from atmospheric heating by thermal insulation .

Thus, the proposed solution allows to increase the efficiency of the thermal power plant due to the additional generation of electric energy and lower fuel consumption for steam generation in the boiler.

Claims (1)

The method of operation of a thermal power plant, in which sharp steam is generated in a steam boiler, which is supplied to a heating steam turbine, the lower and upper heating taps of the turbine steam heat the network water in the lower and upper network heaters, the heating water is deaerated in the deaerator, and then fed to return network pipe in front of the lower network heater, characterized in that the deaerated make-up water is cooled to surface heat before being fed to the return network pipe a reduced natural gas cooler exchanger, which is heated in the heat exchanger with make-up water and then fed to the burners of the steam boiler, and the reduced natural gas pipeline between the gas pressure reducing device and the make-up water heat exchanger-cooler is protected from heating by atmospheric air by thermal insulation.