RU2406830C1 - Operating method of thermal power plant - Google Patents

Abstract

FIELD: power industry. ^ SUBSTANCE: in heat exchanger installed as to heating medium into the network installation before network heaters of extraction turbine, and as to heated medium - into the feed path of the turbine having condenser, after the condensate pump there performed is re-distribution heat energy from the network installation of extraction turbine to regenerative diagram of the turbine having the condenser. ^ EFFECT: increasing economy, reliability and manoeuvrability of the plant owing to increasing the economy of extraction turbines, at increase of the fraction of eclectic power generated on the basis of heat consumption and smoothing of temperature of return system water, generation of additional electric power on the turbine having the condenser. ^ 1 dwg

Description

The invention relates to the field of power engineering, in particular to methods of operating a thermal power station, and can be used at thermal power plants.

A known method of operation of a thermal power plant (Usov S.V., Kazarov S.A. Modes of thermal power plants.- L .: Energoatomizdat, 1985, p. 95), in which high pressure heaters are turned off to pass peak loads.

The disadvantages of this method include a decrease in the temperature of the feed water, a decrease in the efficiency of the turbine unit due to an increase in the passage of steam into the condenser and a decrease in the thermal efficiency of the cycle.

Technically close to the claimed method is the method of operation of a thermal power plant (see patent No. 2269013, IPC F01K 17/02, publ. 01/27/2006), in which the network water from consumers is supplied to the evaporator of the heat pump installation as a low-potential heat source, heated in the condenser of the heat pump installation and in the network heaters of cogeneration turbines. The entire flow of network water in the condenser of the heat pump installation is heated after heating the water in the network heaters of cogeneration turbines.

The disadvantage of this method is the significant consumption of electrical energy.

The technical result of the invention is to reduce the temperature of the return network water returned to the station, increase the power of the turbine having a condenser, increase the station's efficiency, and allow the peaks and dips of the electric load to pass.

The result is achieved in that in the method of operation of a thermal power plant, in which the network water supplied by consumers is heated in the network heaters of a cogeneration turbine, before heating the network water in the network heaters, its temperature is reduced in the heat exchanger installed in the network installation before the heating medium network heaters of the cogeneration turbine, and through the heated one - into the turbine feed path having a condenser after the condensation pump.

The essence of the proposed method of operation of a thermal power plant is that a heat exchanger is installed, which is connected via a heating medium to the network installation in front of the network heaters of the heating turbine, and along the heated one, into the turbine feed path having a condenser after the condensation pump.

The network water after the consumer, returning to the station, heats the feed water of the turbine having a condenser, lowering the temperature of the return network water, increasing the share of electricity generation for the heat consumption of the cogeneration turbine.

The drawing shows a diagram of the method of operation of a thermal power plant, where: 1, 2 - steam boiler; 3, 4 - steam turbine; 5, 6 - electric generator; 7 - regenerative system of a condensation turbine; 8 - regenerative system of a cogeneration turbine; 9 - network heaters; 10, 11 - capacitor; 12 - water-water heat exchanger; 13 - consumer.

The method of operation of the thermal power plant is that the steam from the boiler 1 enters the turbine 3, where, expanding in the stages of the cylinders, it converts the potential thermal energy of the steam into the mechanical energy of rotation of the turbine rotor 3. The rotating rotor converts mechanical energy into electrical energy in an electric generator 5 Part of the steam goes to regenerative water heating, and part of the steam to heat water in the network heaters 9. The remaining steam after the turbine 3 is condensed in the condenser 10. The steam from the boiler 2 enters the turbines 4, where the steps of expanding in the cylinders, converts thermal potential energy into mechanical energy steam turbine rotor 4. The rotating rotor converts mechanical energy into electrical energy in the electric generator 6. Part of steam goes on regenerative heating water. The remaining steam after the turbine 4 is condensed in the condenser 11. The water formed by the condensate pump is supplied to the heat exchanger 12, in which the heat energy of the return mains water is transferred to the feed water of the turbine having a condenser, the heated feed water is sent to the regenerative circuit of the turbine having a condenser 7, after which the feed water is fed by a feed pump to the steam boiler 2.

A comparative analysis of the circuits was carried out: a circuit consisting of network heaters and a heat pump installation as a low-grade heat source, and a circuit in which the heat exchanger is installed in a heating system in a network installation in front of the network heaters of a cogeneration turbine, and in a heated one, in a turbine feed path having condenser after condensation pump.

As a result of the analysis, it was found that the use of a circuit in which the heat exchanger is installed in a heating system in a network installation in front of the network heaters of a cogeneration turbine, and in a heated one in a turbine feed path having a condenser, after a condensing pump, increases the station's efficiency, allows peaks to pass and electrical load dips, allows you to increase the share of electricity generation based on heat consumption of a cogeneration turbine, allows you to smooth out the temperature fluctuations with network water, it is possible to use at high outdoor temperatures, the reliability of the station is increased by reducing fluctuations in the temperature of return network water. The economic effect will be observed:

1) when the pressure in the first selection along the feed water of the condensation turbine is greater than or equal to the saturation pressure of water at the return temperature of the heating water turbine network, due to the displacement of this selection and an increase in the amount of electricity supplied for heat consumption;

2) when the pressure in the first selection along the feed water of the condensation turbine is less than the saturation pressure of water at the return temperature of the heating water turbine network at a higher efficiency of the low pressure cylinder of the turbine having a condenser.

Thus, the invention allows to increase the efficiency of the station by increasing the efficiency of cogeneration turbines, generate additional electricity based on the heat consumption of the cogeneration turbine, increase the maneuverability of the station, increase the efficiency of the station during the transitional heating period and summer period when there is only a load on hot water supply.

Claims (1)

The method of operation of a thermal power plant, in which the network water from consumers is heated in the network heaters of a cogeneration turbine, characterized in that before heating the network water in the network heaters, its temperature is reduced in the heat exchanger installed in a network installation in front of the network heaters in a heating medium a cogeneration turbine, and along a turbine having a condenser heated in the feed path, after a condensation pump.

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