RU44144U1 - CONTACT STEAM-GAS HEAT ELECTROCENTRAL WITH A CLOSED HEATING SYSTEM - Google Patents

Abstract

The contact combined cycle heat and power plant with a closed heating system belongs to the field of energy, and can be used to upgrade the basic heat and power plants used for the joint production of electric and thermal energy. The objective of the proposed technical solution is to create a contact combined-cycle heat and power plant with a closed heating system, which allows for the efficient modernization of the basic steam-turbine heat and power plants with an increase in their power and efficiency; at significantly reduced costs. The task is achieved due to the fact that the contact combined cycle heat and power plant with a closed heating system, containing a boiler, a main steam pipe, a heating steam turbine, a high pressure deaerator, a high pressure feed pump, a closed heating system with network heaters, reverse and direct network water pipelines, Moreover, it is additionally equipped with a heat recovery unit for the steam-gas mixture, containing a recovery boiler with high steam generators and an additional nym low-pressure steam generator, the separated water utilization unit, which duct the low pressure feedwater is connected to the input of the additional low-pressure steam generator HRSG; the irrigation water pipeline is connected with the irrigation device of the heat recovery unit of the vapor-gas mixture; in turn, the inlet of the high-pressure steam generator of the recovery boiler is connected by a steam-gas mixture pipeline to the outlet of a combined-cycle turbine installation; a low-pressure steam generator of the recovery boiler is connected by an additional low-pressure steam line to a steam-gas-turbine installation; the unit for use of separated water by pipelines of low-pressure feed water, irrigation water and separated water is connected to the heat recovery unit of the gas-vapor mixture, and by pipelines of chilled and heated network water with a base heat and power plant; the high-pressure steam generator is connected by pipelines of high-pressure feed water and high-pressure steam to the base cogeneration plant.

Description

The contact combined cycle heat and power plant with a closed heating system belongs to the field of energy, and can be used to upgrade the basic heat and power plants used for the joint production of electric and thermal energy.

Known combined gas-vapor installation type "Aquarius", a gas turbine installation which runs on a gas-vapor mixture. A steam recovery boiler is located in the exhaust duct of its combined cycle turbine. The recovery boiler contains a steam generator located along the gas-vapor mixture, an irrigation device, a contact gas cooler-condenser with a separation device. The gas separation unit of the recovery boiler is connected by the exhaust duct to the atmosphere and has a separated water discharge pipe. The irrigation device of the recovery boiler is connected to the chilled irrigation water supply pipe. The inlet pipe of the steam generator of the recovery boiler is connected to the feed water pipe, and its outlet pipe is connected by a steam pipe to the devices for supplying “ecological” and “energy” steam to the combustion chamber. [Romanov V.I., Krivutsa V.A. Combined gas-steam plant with a capacity of 16-25 MW with heat recovery from exhaust gases and water recovery from the combined-cycle gas stream. "Thermal Power" No. 4, 1966, pp. 27-30].

In the described gas-vapor installation of the Aquarius type, the steam generated in the recovery boiler is used only for injection of the combustion chamber of a combined cycle gas turbine, in addition, the heat of separated water is not used to heat the heating network water in existing steam turbine heating plants, therefore this installation cannot be used for their modernization.

The closest in technical essence is a contact combined cycle heat and power plant with a closed heating system [Combined-cycle gas turbine unit CCGT - 60 C. Commercial offer. FSUE “Salyut”, 2005 ”], containing a steam recovery boiler, a separated water tank, a heat pump installation, a network heating installation. In a waste heat boiler installed in the exhaust gas duct behind a low-pressure steam and gas turbine, the heating surfaces of the steam generator, a network heater, an irrigation device and a gas cooler-condenser with a separation device are placed sequentially along the gas-vapor mixture. Irrigation device connected to the pipeline

supply of chilled irrigation water. The separating device of the recovery boiler is connected by the flow of separated gases through the exhaust gas duct and exhaust fan to the atmosphere, and by separated water. and through separated water (condensate) it is connected by a pipeline to a tank of separated water (capacity - a condensate storage tank). The inlet pipe of the steam generator is connected by a feed water pipe to a separated water tank. The outlet pipe of the steam generator is connected by a steam line through the backpressure steam turbine with steam injection devices into the combustion chamber of the high-pressure steam-gas turbine. The inlet pipe of the heat pump installation is connected through a separated water pipe to the tank of separated water, and its outlet pipe through a separated water is connected by a pipe to the irrigation device of the recovery boiler. By heating network water, the heat pump installation is connected at the inlet to the return pipeline and at the outlet to the direct network water pipe of the closed heating system.

The combined cycle gas turbine unit CCGT-60 C cannot be used to modernize the basic steam turbine cogeneration plants, since the steam it produces has parameters lower than the standard ones for typical cogeneration turbines, and is used only for injection of a gas-vapor turbine into the combustion chamber. In addition, the heat separated in the gas-condenser separation device cannot be used to heat the network water of the heating system of the base steam-turbine cogeneration plants.

The objective of the proposed technical solution is to create a contact combined-cycle heat and power plant with a closed heating system, which allows for the efficient modernization of the basic steam-turbine heat and power plants with an increase in their power and efficiency; at significantly reduced costs.

The task is achieved due to the fact that the contact combined cycle heat and power plant with a closed heating system, containing a boiler, a main steam pipe, a heating steam turbine, a high pressure deaerator, a high pressure feed pump, a closed heating system with network heaters, reverse and direct network water pipelines, Moreover, it is additionally equipped with a heat recovery unit for the steam-gas mixture, containing a recovery boiler with high steam generators and an additional nym low-pressure steam generator, the separated water utilization unit, which duct the low pressure feedwater is connected to the input of the additional low-pressure steam generator HRSG; pipeline

irrigation water is connected with the irrigation device of the heat recovery unit of the vapor-gas mixture; in turn, the inlet of the high-pressure steam generator of the recovery boiler is connected by a steam-gas mixture pipeline to the outlet of a combined-cycle turbine installation; a low-pressure steam generator of the recovery boiler is connected by an additional low-pressure steam line to a steam-gas-turbine installation; the unit for use of separated water by pipelines of low-pressure feed water, irrigation water and separated water is connected to the heat recovery unit of the gas-vapor mixture, and by pipelines of chilled and heated network water with a base heat and power plant; the high-pressure steam generator is connected by pipelines of high-pressure feed water and high-pressure steam to the base cogeneration plant.

In the high-pressure steam generator of the recovery boiler, high-pressure steam is generated, which is supplied to the base cogeneration plant, which makes it possible to upgrade this cogeneration plant with an increase in its power and efficiency. The use of the heat of most of the separated water for heating the network water of the heating network of the closed heating system of the modernized base heat and power plant allows to further increase its efficiency.

The use of high pressure feed water for generating steam prepared in the base steam-turbine cogeneration plant allows to reduce the cost of preparing high-quality feed water.

The connection of the heat pump installation by pipelines of chilled and heated network water to the pipelines of return and direct network water of the base heating plant allows to further increase its thermal efficiency.

The use of softened and deaerated separated water to generate low-pressure steam makes it possible to cheapen the installation for the preparation of low-pressure feed water.

An increase in the temperature of the gas-vapor mixture in front of the recovery boiler provides the possibility of generating overheated high-pressure steam in it with parameters standard for existing heating steam turbines.

This allows you to expand the generated high-pressure steam in typical heating cogeneration steam turbines of the modernized cogeneration plant, which also supplies and expands the high-pressure steam generated by the boiler units of this steam-turbine cogeneration plant, while reducing steam production and fuel consumption for boiler units,

the thermal efficiency of the modernized steam-turbine cogeneration plant increases.

In the drawing in Fig. 1, a block diagram of a combined cycle gas-fired combined heat and power plant with a closed heating system is shown.

The block diagram in figure 1 consists of three blocks: the base cogeneration plant with a closed heating system 1; heat recovery unit of the gas-vapor mixture 2; block for the use of separated water 3.

The drawing of figure 2 shows a schematic diagram of a contact combined cycle combined heat and power plant with a closed heating system.

A basic heat and power plant with a closed heating system 1 contains: a high pressure feed pump 24, high pressure feed water pipelines 7, regenerative high pressure heaters 25, boiler unit 26, main steam line 27, heating steam turbine 28, electric generator 29, steam line 30, high pressure deaerator 31 , closed heating system 32, network heater 33, pipelines direct 34 and return 35 network water.

The heat recovery unit of the gas-vapor mixture 2 comprises: a gas-vapor mixture pipeline 4; low pressure steam line 5; high pressure steam line 6; a steam recovery boiler of two steam pressures 13, comprising a high pressure steam generator 14, a low pressure steam generator 15, an irrigation device 16, a gas cooler-condenser 17, an exhaust gas duct 18 with a smoke exhaust.

The unit for use of separated water 3 contains: pipelines of chilled 8 and heated 9 network water piping of low pressure feed water 10 with a feed pump; irrigation water pipeline 11, separated water pipeline 12, separated water tank 19, low pressure feed water softener filter 20, deaerator 21, pipeline with separated water pump 22, heat pump unit 23.

Contact cogeneration plant with a closed heating system is made as follows.

The boiler unit 26 of the contact cogeneration plant with a closed heating system is connected by the main steam line 27 to the heating steam turbine 28, which is connected by the steam pipe 30 to the network heaters 33 of the closed heating system 32. The high pressure deaerator 31 is connected through the high pressure feed pump 24 to one feed water pipe 7 through high heaters pressure 25 with the boiler unit 26 and the second feed water pipe 7 with the input of the high pressure steam generator 14 of the recovery boiler a

13. The return network water pipe 35 of the base heat and power plant is connected by the chilled network water pipe 8 to the input of the heat pump installation 23, and the direct network water pipe 34 is connected by the heated network water pipe 9 to the output of the heat pump installation 23.

The output of a low-pressure gas turbine (not shown) is connected by a gas-vapor mixture pipeline 4 to a recovery boiler 13.

In the waste heat boiler 13 of the heat recovery unit of the steam-gas mixture 2, along the steam-gas mixture are placed, a high-pressure steam generator 14, an additional low-pressure steam generator 15, an irrigation device 16, a gas cooler-condenser 17 with a separation device. The exhaust gas duct of the recovery boiler 13 is connected by a pipe 18 through a smoke exhauster to the atmosphere. The output of the high pressure steam generator 14 is connected by the steam line 6 to the main steam line 27 of the base heat and power plant 1. The output of the low pressure steam generator 15 is connected by the steam line 5 to the low pressure afterburner of the steam and gas turbine unit (not shown), and its input is connected by a pipe 10 through the low pressure feed pump, deaerator 21 and a filter for softening the feed water 20 with the separated water tank 19 of the separated water usage unit 3. The irrigation device 16 is connected by the irrigation water pipe 11 to the outlet heat pump installation 23. The separator device of the gas cooler-condenser 17, the pipe of the separated water 12 is connected to the inlet of the tank of separated water 19.

The outlet of the separated water tank 19 is connected by a second separated water pipe through a pump 22 to the inlet of the heat pump installation 23. The heat pump installation 23 is connected through a chilled network water pipe 8 to a return pipe 35, and at the outlet, a heated network water pipe 9 to a closed main water pipe 34 heating system 32 cogeneration plant 1.

Contact cogeneration plant with a closed heating system works as follows.

Superheated high-pressure steam is generated in the boiler unit 26 of the base heat and power plant with a closed heating system 1, through the main steam line 27 it is brought to the heating steam turbine 28 and expanded. The useful work of the steam turbine 28 is used to generate electricity in the electric generator 29. The steam from the regenerative taps of this steam turbine is used to heat the feed water in the regenerative feed water heaters 26.

Steam from the steam pipe 30 in the network heater 33 is used to heat the network water of the closed heating system 32.

In the high-pressure deaerator 31, the feed water is deaerated and a high-pressure feed pump 24 is supplied, part of it through the high-pressure regenerative heaters 25 to the boiler unit 26. The remaining part of the feed water is fed through the high-pressure feed water 7 to the inlet to the high-pressure steam generator 14 of the recovery boiler 13. From the outlet of this steam generator 14, superheated steam is supplied through the high pressure steam line 6 to the main steam line 27 of the base heat and power plant 1.

The vapor-gas mixture leaving the steam-gas-turbine unit (not shown) is supplied through the pipeline of the gas-vapor mixture 4 to the heat recovery boiler 13 of the heat recovery unit of the gas-vapor mixture 2.

The heat of the vapor-gas mixture is utilized to generate superheated high-pressure steam in the high-pressure steam generator 14 and low-pressure steam in the low-pressure steam generator 15.

High pressure steam is supplied through the high pressure steam line 6 to the main steam line 27 of the base heat and power plant 1. Low pressure steam is sent through the low pressure steam line 5 to a steam and gas turbine unit (not shown).

Irrigation water with a temperature of 20-30 ° C is injected into the vapor-gas mixture, partially cooled during generation of high and low pressure steam, in the irrigation device 16, supplied to it through the irrigation water pipe 11 from the unit for using separated water 3.

Due to this, the vapor component of the vapor-gas mixture is condensed in the gas cooler-condenser 17. In the separation device of the gas cooler-condenser 17, the condensate of the vapor-gas mixture and the irrigation water from the fuel combustion products are separated. The products of combustion through the exhaust duct 18 with a smoke exhauster are discharged into the atmosphere.

A smaller part of the separated water in block 3 is softened in a softener filter for low-pressure feedwater 20, deaerated in a deaerator 21, and piped through a low-pressure feed pump 10 to the inlet of the low-pressure steam generator 15 of the recovery boiler 13. Most of it is separated by a pump water 22 is supplied through a pipeline to the entrance to the heat pump installation 23, in which it is cooled. The heat of separated water is used to heat part of the network water of the heating system of the closed heating system of the modernized base heat and power plant 1, supplied to the heat pump unit 23 through a chilled network water pipeline

8 and the heated network water 9 of the block 3 discharged from it through the pipeline. The cooled separated water is supplied through the irrigation water pipeline 11 to the irrigation device 16 for injection into the steam-gas mixture of the recovery boiler 13.

The proposed layout of the cogeneration plant with a closed heating system has advantages both over the known analogues and over the prototype and provides for the modernization of the base cogeneration plants with a closed heating system.

Claims (1)

Contact gas-fired combined heat and power plant with a boiler, main steam pipe, heating steam turbine, high pressure deaerator, high pressure feed pump, closed heating system with network heaters, reverse and direct water pipelines, characterized in that it is additionally equipped with a recycling unit the heat of the vapor-gas mixture containing the recovery boiler with a high-pressure steam generator and an additional low-pressure steam generator pressure a unit for using separated water, which is connected to the input of an additional low-pressure steam generator by a waste heat boiler via a low-pressure feed water pipe; the irrigation water pipeline is connected with the irrigation device of the heat recovery unit of the vapor-gas mixture; in turn, the input of the high-pressure steam generator of the recovery boiler is connected by the steam-gas mixture pipeline to the output of the steam-gas-turbine installation; a low-pressure steam generator of the recovery boiler is connected by an additional low-pressure steam line to a steam-gas-turbine installation; the unit for use of separated water by pipelines of low-pressure feed water, irrigation water and separated water is connected to the heat recovery unit of the gas-vapor mixture, and by pipelines of chilled and heated network water with a base heat and power plant; the high-pressure steam generator is connected by pipelines of high-pressure feed water and high-pressure steam to the base cogeneration plant.