Main electric and heating line with closed thermal system

FIELD: power engineering.

SUBSTANCE: system has boiler, steam turbine, electric generator, deaerator, feeding pump, and is additionally provided with gas-steam turbine plant block having low-pressure combustion chamber, steam-gas mixture heat utilization block and separated water utilization block. Steam-gas mixture heat utilization block has utilization boiler with high-pressure steam generator and additional low-pressure steam generator. Block for using separated water via low-pressure nutritious water pipeline is connected to low-pressure steam generator of utilization boiler and via irrigation water pipeline is connected to irrigation device of steam-gas mixture heat utilization block. Input of high-pressure steam generator of utilization boiler is connected by steam-gas mixture pipeline to output of steam-gas turbine plant. Low-pressure steam generator of utilization boiler is connected via low-pressure steam generator to additional combustion chamber of steam-gas turbine plant. Block for using separated water via pipelines for low-pressure nutritious water, irrigation water and separated water is connected to block for utilization of steam-gas mixture heat and via pipelines for cooled down and heated network water - to base main line. High-pressure steam generator is connected via high-pressure nutritious water pipeline and high-pressure steam pipeline to base main line.

EFFECT: higher efficiency.

2 dwg

 

Combined with a closed heating system relates to the field of energy and can be used for co-production of electricity and thermal energy.

Known combined gas-steam installation of the "Aquarius", containing the gas-turbine unit with air compressor, a combustion chamber with devices supply "environmental" and "energy" steam, steam turbine placed in its exhaust gas duct steam boiler, generator.

The boiler contains located along the vapor-gas mixture, a steam generator, an irrigation device, the contact gas cooler-condenser with a separator device. The irrigation device of the boiler is connected to a pipeline for supplying irrigation water cooled. Separation device for gases associated exhaust duct with the atmosphere, and separated the water from the tank separated water. The last feedwater pipeline connected to the inlet side of the steam generator. The steam generator is connected by a steam line with the combustion chamber. The second pipeline to the storage tank separated water is connected by piping through a water-cooling device with a separator device of the gas cooler-condenser. The combined-cycle gas turbine rotor shaft connected with the rotor of air is on the compressor and the rotor of the generator [Romanov V.I., Krivutsa VA Combined gas-steam plant with a capacity of 16 to 25 MW with heat recovery of exhaust gases and regeneration of water from the vapor-gas stream. "Thermal engineering", No. 4, 1966, pp. 27-30].

Vapour installation type "Aquarius" the produced steam is used only for injection into the combustion chamber, so this setting may not be applied to upgrade existing steam turbine combined heat and power plants.

Known contact of a combined cycle plant with a closed heating system ["combined-cycle power plant CCPP-60C. Commercial offer. The Federal state unitary enterprise "Salut", 2005"], contains an air compressor, a combustion chamber high pressure devices for injection "environmental" and "energy" steam, steam turbine high pressure power steam turbine low-pressure, back-pressure steam turbine, generator, steam boiler, tank separated water, heat pump installation, network and heating installation. In the recovery boiler, installed in the exhaust duct for power combined-cycle low-pressure turbine is placed in series along the gas mixture heating surfaces of the steam generator heating network installation, the irrigation device and the gas cooler-condenser with a separator device.

p> The separation device of the boiler is connected downstream of the separated gases through the exhaust flue and exhaust to the atmosphere, and the separated water (condensate) is connected by pipeline to the tank separated water storage capacity of the drive condensate). The inlet of the steam generator is connected by a pipe feeding water to the tank separated water. The outlet of the steam generator is connected by a steam line with parovpusknyh body back-pressure steam turbine, the exhaust of which pair is connected by pipelines with devices of steam injection into the combustion chamber of a high pressure. Inlet pipe heat pump unit are connected by separated water pipeline to Baku separated water and its outlet for separated water is connected by a pipeline with the irrigation device of the boiler. Heated water network heat pump system is connected at the input to the pipeline back and output to the pipeline direct network closed water heating system.

Described contact combined-cycle power plant is designed to create new high-efficiency cogeneration units. It cannot be used for upgrade of the basic steam turbine combined heat and power plants, as it is the steam generator produces superheated steam with parameters below article is Hartig for model turbines. In addition, it is connected by a steam line to a special back-pressure steam turbine, the exhaust of which is connected by pipelines with devices of steam injection into the combustion chamber of a high pressure and cooling system steam and gas turbines. In this installation you cannot use the existing gas turbine units with split shaft and, as a consequence, there is a need to use special steam and gas turbines.

Closest to the technical essence is combined with a closed heating system [Ryzhkin VIA Thermal power station. Textbook for high schools. Ed. 2-5 revised and enlarged additional, Meters, Energy, 1976, 12-26], containing the boiler, main steam, extraction steam turbine regenerative and district heating extraction steam generator, regenerative heaters high and low pressure, high pressure deaerator, feed pump high pressure, a closed heating system with network heaters, pipelines reverse and direct water network. The boiler unit is associated main steam line high pressure cogeneration steam turbine, the rotor of which is connected to the shaft with the rotor of the generator. Regenerative extraction steam cogeneration steam turbine are connected by pipelines with the regenerate the main heaters, its heating selection network with heaters sealed heating system, connected at the input to the pipeline reverse, and output to the pipeline direct network water heating systems.

The data steam turbine combined heat and power plants have relatively low efficiency. Therefore, there is an urgent need to modernize these plants with improved thermal and economic efficiency, but due to the low thermodynamic efficiency of steam turbine cycles impossible to modernize and increase efficiency.

The objective of the proposed technical solution is the creation of a combined cycle power plant with a closed heating system to ensure the effective modernization of the basic steam turbine combined heat and power plants to increase their capacity and efficiency; at significantly reduced cost.

This goal is achieved due to the fact that the heat and power plant with a closed heating system contains a boiler, main steam, extraction steam turbine cogeneration selection of steam generator, deareator high-pressure feed pump high pressure, a closed heating system with network heaters, pipelines reverse and direct water network, while on the and is further provided with a block parogazoturbinnogo plant with post combustion of low pressure; the heat recovery unit gas mixture containing boiler with steam high and additional steam generator low pressure unit using the separated water, which the feedwater pipeline of low pressure associated with the inlet of the steam generator low pressure boiler; pipeline irrigation water associated with irrigation device of the heat recovery unit gas mixture; in turn, the entrance of the steam generator high-pressure boiler is connected by pipeline gas mixture with the release of steam and gas turbine installations; steam generator low pressure boiler is connected by a steam line low pressure with additional afterburner parogazoturbinnogo installation; the unit using the separated water piping feedwater low pressure, irrigation water and the separated water is associated with the heat recovery unit gas mixture, and piping, chilled and heated water network with a base combined heat and power; steam generator high pressure is connected by piping feedwater high pressure and high-pressure steam with a base combined heat and power.

The secondary combustion chamber low pressure parogazoturbinnogo installation, placing it between the gas turbine is th high pressure and power of the gas turbine and the injection into it of low-pressure steam from the secondary steam generator low pressure boiler, allows you to increase the power parogazoturbinnogo installation, to increase the flow rate and temperature of the gas mixture at the inlet to the HRSG. Due to this, in the steam generator produces high-pressure steam supplied to the base of the plant, which allows you to upgrade the plant to increase its capacity and efficiency.

The use of heat greater part of the separated water heating system water heating systems closed heating system upgraded base stations can further increase its efficiency.

Use to generate high-pressure steam feed water, prepared in the basic steam turbine combined heat and power, you can reduce the costs of producing high-quality feed water.

Connection heat pump installation piping chilled and heated water network pipes backward and forward network water base heating plant to further increase its thermal efficiency.

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.

In the proposed combined heat and power, you can use the existing turbochargers is gazoturbinnyh units with split shaft which can significantly reduce the cost of creating these installations.

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 cogeneration steam turbines, reduce the steam and fuel consumption at boiler units, increases thermal efficiency of the modernized steam turbine combined heat and power.

Figure 1 shows a block diagram of the power plant with a closed heating system; figure 2 Pref is dena concept.

The block diagram in figure 1 consists of four units: the base combined with a closed 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 combined heat and power.

Base combined with a closed heating system 1 includes: feeding the high-pressure pump 31, piping feedwater high pressure 8, regenerative high pressure heaters 32, the boiler unit 33 main steam line 34, cogeneration steam turbine 35, the steam line 36, the high pressure deaerator 37, a closed heating system 38, the network heater 39, the direct pipelines 40 and 41 reverse water network, parogazoturbinnogo system 2 includes: air compressor 14, combustor, high pressure 15, gas high-pressure turbine 16 (compressor turbine), the secondary combustion chamber 17, the steam turbine low pressure 18 (free power turbine), the generator 19, the pipeline gas mixture 6.

The heat recovery unit gas mixture 3 includes: a steam boiler of the two pressures 20, containing the steam generator high pressure 21, steam piping high pressure 7, the steam generator low pressure 22, the steam line low pressure 5, op is a relatively device 23, gas cooler-condenser 24, the exhaust gas duct 25 with smoke.

Block the use of separated water 4 includes: pipe separated water 13, the tank separated water 26, the filter softening of feed water low pressure 27, deaerator 28, the feedwater pipeline low pressure 11 with a nutrient pump, pipeline pump separated water 29, heat pump unit 30, the pipeline irrigation water 12, the piping chilled 9 and heated 10 network water.

Combined with a closed heating system performed as follows.

The boiler unit 33 of the base stations with closed heating system 1 is connected to the main steam line 34 with cogeneration steam turbine 35 which is connected by a steam line 36 with the network heaters 39 closed heating system 38. The high pressure deaerator 37 is connected through a nutritious high-pressure pump 31 one feedwater pipeline 8 through the high pressure heaters 32 with the boiler unit 33 and the second feedwater pipeline 8 to the entrance of the steam generator high pressure 21 of the boiler 20. The reverse pipeline network water 41 of the base stations is connected by a pipe chilled water network 9 to the input of heat pump devices 30, and a direct pipeline network the odes 40 is connected by a pipe heated water network 10 with the release of heat pump installation 30.

In the gas duct between the air compressor 14 and the gas turbine high pressure 16 block parogazoturbinnogo setup 2 set the combustion chamber of a high pressure 15. In the gas duct between the high-pressure turbine 16 and steam low-pressure turbine 18 additionally mounted in the burning chamber 17, provided with a device for injection of steam. The output vapor-gas low-pressure turbine 18 is connected by pipeline gas mixture 6 recovery boiler 20.

In the recovery boiler 20 heat recovery unit gas mixture 3, in the course of gas-vapor mixture is placed, the steam generator high pressure 21, additional steam generator low pressure 22, irrigation device 23, the gas cooler-condenser 24 with the separation device. The exhaust flue of the boiler 20 is connected by a pipe 25 through the smoke to the atmosphere. The output of the steam generator high pressure 21 is connected by a steam pipe 7 to the main steam line 34 of the base stations. The output of the steam generator low pressure steam line 22 is connected 5 with afterburner low pressure 17, and its input is connected by a pipe 11 through the feed pump low pressure deaerator 28 and the filter feed water softening 27 with tank separated water 26 to block the use of separated water. Irrigation device 23 is connected by the pipeline will irrigate the water through 12 with the release of heat pump installation 30. The separation device of a gas cooler condenser 24, pipe separated water 13 is connected to the input of the tank separated water 26.

The output from the tank separated water 26 is connected to the second pipe separated water through the pump 29 to the input of heat pump installation 30. Heat pump unit 30 is connected via piping chilled water network 9 to the return line 41, and the output pipeline heated water network 10 to the pipeline 40 direct network closed water heating system 38 combined heat and power.

Combined with a closed heating system works as follows.

High-pressure superheated steam produced in the boiler unit 33 of the base stations with closed heating system 1 according to the main steam line 34 leading him 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 closed water heating system 38.

In the high pressure deaerator 37 dearyou feed water and the with 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 turbine high pressure 16 in the secondary combustion chamber 17, bring additional heat fuel. Here on the steam line low pressure 5 serves low pressure steam. 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 RA the GTC 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°maximum allowed for non-cooled gas turbine. The steam-gas mixture released from the power turbine 18 via pipeline gas mixture 6, served 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 to it by pipeline irrigation water 12 from the unit using the heat of the separated water 4.

Due to this, in the gas cooler-condenser 24 condense the 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. N the FL combustion in 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 pump separated water 29 is served by pipeline to the entrance of the heat pump unit 30 where it is cooled, use the warmth of the separated water part for heating part of the network of water heating systems closed heating system upgraded base stations 1, applied heat pump unit 30 through the pipeline chilled water network 9 and discharged from it through the pipeline heated water network 10 of block 4. Chilled separated water pipeline irrigation water 12 serves to irrigation device 23 for injection into a gas-vapor mixture boiler 20.

The proposed layout of the power plant with a closed heating system has advantages over the known analogues, and before the prototype and provides modernization of the basic combined heat and power plants with closed heating system.

Combined with a closed heating system contains a boiler, main steam, extraction steam turbines district heating draft pair, generator, deareator high-pressure feed pump high pressure, a closed heating system with network heaters, pipelines reverse and direct water network, characterized in that it is further provided with a block parogazoturbinnogo plant with post combustion of low pressure, the heat recovery unit gas mixture containing boiler with steam high and additional steam generator low pressure unit using the separated water, which the feedwater pipeline of low pressure associated with the inlet of the steam generator low pressure boiler, pipeline irrigation water associated with irrigation device unit heat recovery steam-gas mixture, in turn, the entrance of the steam generator high pressure of the boiler is connected by pipeline gas mixture with access parogazoturbinnogo installation, the steam generator low pressure boiler is connected by a steam line low pressure with additional afterburner parogazoturbinnogo installation, block the use of separated water piping feedwater low pressure irrigation water and the separated water is associated with the heat recovery unit gas mixture, and piping, chilled and heated water network with BA the new combined heat and steam generator high pressure is connected by piping feedwater high pressure and high-pressure steam with a base combined heat and power.



 

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