Method for operation of main electrical and heating line with open thermal system

FIELD: power engineering.

SUBSTANCE: heat exhausted from additional steam-gas turbine plant is utilized to generated high pressure steam and additionally low pressure steam. High pressure steam is sent to and expanded in thermal steam turbine. Low pressure steam is sent to additional low pressure combustion chamber of steam-gas turbine plant, to where also additional fuel is directed, temperature of steam-gas mixture is set mainly at level close to 900°C and expanded in low pressure steam-gas turbine. Nutritious water for generation of high pressure steam is taken from high pressure deaerator of main electrical heating line. Into steam-gas mixture, cooled down for generation of low pressure steam, irrigation water is injected, steam component of this steam-gas mixture is condensed, formed condensate is separated and then drained to tank for separated water. Least portion of separated water is used as nutritious water for generation of low pressure steam. Heat of most portion of separated water is used to heat up softened nutritious water, which is then deaerated and sent to heating network of open thermal system of main electrical heating line. Irrigation water cooled down during the process is fed for condensation of steam in steam-gas mixture.

EFFECT: higher efficiency.

2 dwg

 

The method of operation of a combined heat and power with an open heating system relates to the field of energy, and more specifically to a method of operation of a combined cycle power plant.

The known method of contact combined cycle power plant with a closed heating system [combined-cycle power plant CCPP-60C. Commercial offer. The Federal state unitary enterprise "Salut", 2005]. According to this method, the atmospheric air is compressed in the compressor and burn it to fuel in the combustion products of the fuel serves "environmental" and "energy" flows of steam. Resulting gas-vapor mixture consistently expand in gas turbines of high and low pressure, useful work high-pressure turbine is used to compress the air in the compressor, and useful work the low-pressure turbine to drive a generator and produce electricity.

The warmth of the gas mixture after the gas-steam turbine low pressure utilized for steam generation with subsequent partial extension in the back-pressure turbine and fuel injection in the combustion zone of the fuel. Cooled by steam generation steam-gas mixture is injected irrigation water with a temperature of 20-30°and condense the steam component of the gas mixture, sephirot the resulting mixture of steam and condensate irrigation water and separate it from the product is in combustion with subsequent discharge of the latter into the atmosphere.

Separated water is divided into two streams, the minor stream is used as feed water for steam generation and heat a larger stream used in heat pump installation for heating water network closed heating system. Chilled with this greater flow of separated water serves as irrigation water for injection in a partially cooled by steam generation gas-vapor mixture.

When the described method of contact combined-cycle cogeneration plants provide increased thermal efficiency, due to the utilization of heat from the steam component of the gas mixture and its use for heating water network increase specific useful work and the capacity of the gas contact part of a combined cycle power plant, provide low concentration in the flue gases of harmful substances.

This generated steam has custom settings, and is used after pre-expansion in the back-pressure turbine, for injection into the combustion chamber of a high pressure, in addition, in the described way the warmth of the separated water is not used for heating water network in the basic steam turbine cogeneration plants, resulting in this method cannot be used for upgrade of the basic steam turbine teploelectroset what truly with a closed heating system.

The closest in technical essence is a way of working combined heat and power with an open heating system [Sharapov VI Preparation of make-up water heating systems using vacuum deaerators. M.: Energoatomizdat, 1996. - 176 S.: ill, str, RES], according to which boiler steam turbine power plant with an open heating system generate high-pressure superheated steam, increase in cogeneration steam turbine, useful work which is used to drive a generator and produce electricity, steam its heat selections provide the heating network water heating systems, steam regenerative selections produce heating and deaeration of feedwater of the boiler, magchat and dearyou make-up water and serve it in the return line of the heating outdoor heating system.

Steam turbine combined heat and power working in this way have a relatively low efficiency. Therefore there is an urgent need for modernisation of basic heating plants with open heating system with improved thermal and economic efficiency, but the described method does not allow to do it.

The objective of the proposed technical solution is to develop ways of working TEPLOS is trientalis with an open heating system, to ensure their efficient upgrades to increase power and efficiency.

The problem is solved by the method of operation of a combined heat and power with an open heating system, according to which in the boiler to produce superheated steam of high pressure, increase in cogeneration steam turbine, useful work which is used to drive a generator and produce electricity, steam its heat selections provide the heating network water heating outdoor heating system by heat recovery from the exhaust additional parogazoturbinnogo installation generate pairs of high and additionally low pressure steam; high-pressure steam serves and extend in cogeneration steam turbine; a low pressure steam is served in the additional combustion chamber low pressure parogazoturbinnogo installation, there fail extra fuel, set the temperature of the gas mixture mainly at the level close to the 900°With, and expand on it in steam and gas turbine low pressure feed water to generate high pressure steam supplied from the high pressure deaerator combined heat and power; gas-vapor mixture, cooled in the generation of low pressure steam, spray irrigation water, the con is insituut steam component of this gas mixture, sephirot the resulting condensate and divert it into the tank separated water from which a smaller part of the separated water used as feed water for generating low-pressure steam, heat mostly separated water to produce heated softened makeup water, dearyou her and fed into the heating open cogeneration system cogeneration; chilled when irrigation water is fed to the condensation of steam in the gas mixture.

Generation of high pressure steam and its extension in cogeneration steam turbine base stations with an open heating system allows you to upgrade the plant to increase its capacity and efficiency.

Additional generation of low pressure steam can be used for injection to the combustion chamber low pressure parogazoturbinnogo installation.

The condensation of the steam component of the gas mixture allows the use of a smaller part of the separated water after softening and de-aeration as feed water for generating low pressure steam.

The use of heat greater part of the separated water to preheat make-up water heating outdoor heating system upgraded base stations p is well positioned to further increase its efficiency.

Use to generate high-pressure steam feed water prepared in the basic steam turbine cogeneration can reduce the costs of producing high-quality feed water.

Use to generate low pressure steam softened and deaerated separated water can reduce the cost of installation for the preparation of feed water low pressure.

Setting the temperature of the gas mixture before the free power turbine combined cycle low pressure, mainly close to 900°C, the maximum allowable initial temperature for uncooled gas turbine can reduce costs by waiving the application of the cooling system.

Thus the temperature of the vapor-gas mixture for combined cycle power low-pressure turbine before recovery boiler provides the ability to generate it superheated high-pressure steam with parameters, standard for existing cogeneration steam turbines.

This allows you to extend the generated high pressure steam in a typical cogeneration steam turbines modernized power plant, which also serves and extend them in high-pressure steam produced by the boiler units of this steam turbine combined heat and power.

While maintaining the same power the spine of cogeneration steam turbines this reduces the steam and fuel consumption at boiler units, increased thermal efficiency of the modernized steam turbine combined heat and power.

In the drawings illustrating the proposed method, figure 1 shows a block diagram of the upgraded power plant with an open heating system, figure 2 shows its schematic diagram.

The block diagram in figure 1 consists of four units:

base combined with an open heating system 1; block parogazoturbinnogo installation 2; a heat recovery unit gas mixture 3; block the use of separated water 4.

Figure 2 is a schematic diagram of the upgraded power plant.

Combined with an open heating system according to the proposed method works as follows.

High-pressure superheated steam produced in the boiler unit 33 of the base stations with an open heating system 1 according to the main steam line 34 fail to cogeneration steam turbine 35 and extend its useful operation of the steam turbine 35 is used to generate electricity in the electric generator 19. Pairs of regenerative picks this steam turbine is used to preheat the feed water in the regenerative feedwater heater 33. Steam from the steam line 36 in the network the heater 39 produce heating network water quality control Department shall itoi cogeneration system 38.

In the high pressure deaerator 37 dearyou feed water and serves nutritious high-pressure pump 31 part through regenerative high pressure heaters 32 in the boiler unit 33. The rest of the feed water is served piping feedwater high pressure 8 to enter the steam generator high pressure 21 of the boiler 20. From the output of the steam generator 21 superheated steam in the steam line high pressure 7 served in the main steam line 34 of the base stations 1.

Atmospheric air is compressed by the compressor 14 parogazoturbinnogo set of 2, direct it into the combustion chamber of a high pressure 15 and burn it supplied fuel. The products of combustion of fuel to consistently expand in high turbines 16 and low pressure 18. Gas high pressure turbine 16 parogazoturbinnogo installation 2 operates on the products of combustion leaving the primary combustion chamber 15, and power-steam-low pressure turbine 18 operates on the vapor-gas mixture.

Useful gas high-pressure turbine 16 is used for compressing air in the compressor 14. The products of fuel combustion, the exhaust gas high pressure turbine 16, the secondary combustion chamber 17 bring additional heat fuel. Here on the steam line low pressure 5 serves low steam is Alenia. Gas high pressure turbine 16, the proposed method operates on the products of combustion of fuel and power-steam-low pressure turbine 18 operates on the vapor-gas mixture. Useful work combined cycle power low-pressure turbine 18 is used to drive an electric generator 19 and electricity generation. The temperature of the gas mixture before the free power turbine set close to 900°With the maximum allowable for uncooled gas turbine. The steam-gas mixture released from the power turbine 18, pipeline gas mixture 6 serves in the HRSG 20 unit heat recovery steam-gas mixture 3.

The warmth of the gas mixture utilized to generate superheated high-pressure steam in the steam generator high pressure 21 and low-pressure steam in the steam generator low pressure 22.

Steam high pressure steam high pressure 7 served in the main steam line 34 of the base stations. Low pressure steam is directed through the steam line low pressure 5 in additional secondary combustion chamber 17 of the unit combined cycle gas turbine installation 2.

In the steam-gas mixture is partially cooled in formulating a pair of high and low pressure injected into the irrigation device 23 irrigation water with a temperature of 20-30°applied his pipe orositelnoy 12 of the unit using the heat of the separated water 4.

Due to this, in the gas cooler-condenser 24condense steam component of the gas mixture. In the separation unit of the gas cooler condenser 24 sephirot condensation of vapor-gas mixture and irrigation water from the combustion products. The products of combustionin the exhaust gas duct 25 with the exhaust discharged into the atmosphere.

A smaller part of the separated water in unit 4 magchat in softening filter feed water low pressure 27, dearyou in the deaerator 28 and the pipe 11 through the feed pump low pressure bring it to the entrance to the steam generator low pressure 22 of the boiler 20. Most of it, pump the separated water 29 is served by pipeline to the entrance of the heat pump unit 30 where it is cooled, use a warmth greater part of the separated water to preheat make-up water heating outdoor heating system upgraded base stations 1, which fail in the heat pump unit 30 through the pipeline softened make-up water 9 from the base stations 1 and take away from it by pipeline pre-heated make-up water 10 with the tank in the reverse pipeline network water 41 base stations 1. Chilled separated water pipeline irrigation water 12 serves in irrigation device is in 23 for injection into a gas-vapor mixture boiler 20.

The proposed method of operation of a combined heat and power with an open heating system has advantages over the known analogues, and the prototype, and provides for the modernization of the basic combined heat and power plants with an open heating system.

The method of operation of a combined heat and power with an open heating system, according to which in the boiler to produce superheated steam of high pressure, increase in cogeneration steam turbine, useful work which is used to drive a generator and produce electricity, steam its heat selections provide the heating network water heating outdoor heating system, characterized in that by utilizing the heat of exhaust in additional parogazoturbinnogo installation, generate pairs of high and additionally low pressure steam, high pressure steam is served and extend in cogeneration steam turbine low pressure steam is served in the additional combustion chamber low pressure parogazoturbinnogo installation, there also fail for more fuel, set the temperature of the gas mixture mainly at the level close to the 900°With, and expand on it in steam and gas turbine low-pressure feed water to generate high pressure steam serves the C deaerator high pressure steam plant, in the gas-vapor mixture, cooled in the generation of low pressure steam, spray irrigation water, condensed steam component of this gas mixture, sephirot the resulting condensate and divert it into the tank separated water from which a smaller part of the separated water used as feed water for generating low-pressure steam, heat mostly separated water to produce heated softened makeup water, dearyou her and served in heating outdoor heating systems, combined heat and power, chilled while irrigation water is fed to the condensation of steam in the gas mixture.



 

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