Power and heating plant with open power and heat supply system

FIELD: power and heat generation.

SUBSTANCE: proposed power and heating plant with open power and heat supply system including boiler unit, steam turbine, deaerator and feed pump includes steam-gas turbine plant unit with low-pressure afterburning chamber, steam gas mixture heat recovery unit containing recovery boiler with high-and-pressure steam generators, spraying device, gas cooler-condenser and separated water utilization unit. Separated water utilization unit is connected with input of low-pressure steam generator of recovery boiler through water softening set and deaerator. Spraying device is connected with raw water softening device of power and heating plant. Input of high-pressure steam generator of recovery boiler is connected with output of steam-gas-turbine plant. Low-pressure steam generator of recovery boiler is connected with additional afterburning chamber of steam-gas turbine plant. Separated water utilization unit is connected by pipeline of softened and deaerated low-pressure feed water with steam-gas mixture heat recovery unit and pipeline of softened, heated and deaerated make-up water with open power and heat supply system. High-pressure steam generator is connected by feed water and steam pipelines with power and heating plant.

EFFECT: provision of effective modernization of steam turbine power and heating plants with increase of power and economy.

2 dwg

 

Combined with an open 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 the separated water from the storage 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 rotora the air 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 also contact combined cycle combined heat and power with an open 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 the power turbine combined cycle low pressure, 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 open water cogeneration 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 Antartic 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 an open heating system [Sharapov VI Preparation of make-up water heating systems using vacuum deaerators. M.: Energoatomizdat, 1996. - 176 S., str, figure 8.2], which contains 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 heating steam tour of the ins are connected by pipelines with regenerative heaters, and its heat selections - network heaters outdoor heating system that is 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 an open 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 TPS with an open heating system contains a boiler, main steam, extraction steam turbine cogeneration steam extraction, high pressure deaerator, feed pump high pressure, open cogeneration system with network heaters, pipelines reverse and direct water network, is further provided with the components is parogazoturbinnogo plant with post combustion of low pressure; the heat recovery unit gas mixture containing boiler with steam of high and extra-low steam generator pressure; irrigation device, a gas cooler-condenser; block the use of separated water, which the feedwater pipeline of low pressure through the installation of softening and deaerator connected with the inlet of the steam generator low pressure boiler; irrigation device is connected by pipeline with the installation of softening raw water base stations; 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; block the use of separated water piped softened and deaerated feed water low pressure heat recovery unit gas mixture and pipeline softened, heated and deaerated make-up water with an open heating system base stations; steam generator high pressure is connected by piping feedwater high pressure and high-pressure steam with basic teploelectroset what truly.

The secondary combustion chamber low pressure parogazoturbinnogo installation, placing it between the gas turbine and high pressure power gas turbine and the injection into it of low-pressure steam from the secondary steam generator low pressure boiler allows to increase the capacity 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.

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.

Use to generate high-pressure steam feed water, prepared in betvoyagercasino combined heat and power, reduces the costs of producing high-quality feed water.

Use softened in the installation of softening raw water base steam turbine irrigation water for condensing steam from the steam-gas mixture of the heat recovery unit gas mixture, and feeding the most part separated water after deaeration for heating systems open cogeneration system base stations to further increase its 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 turbochargers existing gas turbine units with split shaft, which can significantly reduce the cost of creating these installations.

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

Figure 1 shows the block diagram of the combined heat and power with an open heating system, figure 2 shows a schematic diagram.

The block diagram in figure 1 consists of a couple, the ex blocks:

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.

Base combined with an open heating system 1 includes: feed the high pressure pump 29, piping feedwater high pressure 8, regenerative high pressure heaters 30, boiler 31 main steam line 32, cogeneration steam turbine 33, the generator 34, the steam pipe 35, the high pressure deaerator 36, open cogeneration system 37, the network heater 38, pipelines direct 39 and 40 reverse water network, installation of softening raw water 41, line feed network 42.

Block parogazoturbinnogo installation 2 contains: air compressor 13, combustion chamber high pressure 14, the gas turbine high pressure 15 (compressor turbine), the secondary combustion chamber 16, the steam turbine low pressure 17 (free power turbine), the generator 18, the pipeline gas mixture 6.

The heat recovery unit gas mixture 3 contains: steam boiler two pressures pair 19, containing the steam generator high pressure 20, steam piping high pressure is 7, the steam generator low pressure 21, the steam line low pressure 5, the irrigation device 22, the gas cooler-condenser 23, the exhaust gas duct 24 with smoke.

Block the use of separated water 4 contains: pipeline separated water 12, the tank separated water 25, the filter softening of feed water low pressure 26, deaerator 27, the feedwater pipeline low pressure 11 with a nutrient pump, pipeline pump separated water 28, the pipeline softened 9 irrigation water, the pipeline is heated and deaerated make-up water 10.

Combined with an open heating system performed as follows.

The boiler unit 31 of the base stations with an open heating system 1 is connected to the main steam line 32 with cogeneration steam turbine 33, which are connected by a steam pipe 35 with the network heater 38 open cogeneration system 37. The deaerator high pressure 36 is connected through a nutritious high-pressure pump 29 one feedwater pipeline 8 through the high pressure heaters 30 steam generating unit 31 and the second feedwater pipeline 8 to the entrance of the steam generator high pressure 20 boiler 19. The reverse pipeline network 40 water base stations 1 are connected by a single pipe feed is offered by the water 42 with the installation of softening raw water 41 and the second pipeline heated palpitates water 10 from the deaerator to the output of the tank separated water 25 block 4.

In the gas duct between the air compressor 13 and the gas turbine high pressure 15 block parogazoturbinnogo setup 2 set the combustion chamber high pressure 14. In the gas duct between the high-pressure turbine 16 and steam low-pressure turbine 17 additionally mounted in the burning chamber 16, provided with a device for injection of steam. The output vapor-gas low-pressure turbine 17 is connected by pipeline gas mixture 6 recovery boiler 19.

In the recovery boiler 19 heat recovery unit gas mixture 3 in the course of gas-vapor mixture is placed steam generator high pressure 20, additional steam generator low pressure 21, irrigation device 22, the gas cooler-condenser 23 with the separation device. The exhaust flue of the boiler 19 is connected by a pipe 24 through the smoke to the atmosphere. The output of the steam generator high pressure 20 is connected by a steam pipe 7 to the main steam line 32 of the base stations 1. The output of the steam generator low pressure 21 is connected by a steam pipe 5 with afterburner low pressure 16, and its input is connected by a pipe 11 through the feed pump low pressure tank 27 and the filter feed water softening 26 to the tank separated water 25 block use of the separated water 4. Irrigation device 22 is connected by pipeline arose the nutrient water 9 with the installation of softening raw water 41 unit 1. The separation device of a gas cooler-condenser 23 pipeline separated water 12 is connected with the inlet of the tank separated water 25.

The output from the tank separated water 25 is connected through the pump 28 with piping make-up water 10 through the tank with return line heating system 40 block 1.

Installation of softening raw water 41 is connected by a pipe 42 make-up water with the return pipe 40 open cogeneration system 37 block 1.

Combined with an open heating system works as follows.

High-pressure superheated steam produced in the boiler unit 31 of the base stations with an open heating system 1 according to the main steam line 32 leading him to cogeneration steam turbine 33 and extend its useful operation of the steam turbine 33 is used to generate electricity in the electric generator 34. Pairs of regenerative picks this steam turbine is used to preheat the feed water in the regenerative feedwater heater 30. Steam from steam line 35 in the network the heater 38 produce heating network water open cogeneration system 37.

In the high pressure deaerator 36 dearyou feed water and serves nutritious high-pressure pump 29 part through regenerative heaters high level of the pressure 30 in the boiler unit 31. The rest of the feed water is served piping feedwater high pressure 8 to enter the steam generator high pressure 20 boiler 19. From the output of the steam generator 20 superheated steam in the steam line high pressure 7 served in the main steam line 32 of the base stations 1.

Atmospheric air is compressed by the compressor 13 parogazoturbinnogo set of 2, direct it into the combustion chamber of a high pressure 14 and burn it supplied fuel. The products of combustion of fuel to consistently expand in the high-pressure turbine 15 and the low pressure 17. Gas high pressure turbine 15 parogazoturbinnogo installation 2 operates on the products of combustion leaving the primary combustion chamber 14, and power-steam-low pressure turbine 17 operates on the vapor-gas mixture.

Useful gas high-pressure turbine 15 is used for compressing air in the compressor 13. The products of fuel combustion, the exhaust gas high pressure turbine 15, the secondary combustion chamber 16 bring additional heat fuel. Here on the steam line low pressure 5 serves low pressure steam. Gas high pressure turbine 15 operates on the products of combustion of fuel and power-steam-low pressure turbine 17 operates on the vapor-gas mixture. The useful power of the steam gas is howling low-pressure turbine 17 is used to drive the generator 18 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. Of the combined cycle power turbine 17 via pipeline gas mixture 6 serves in the HRSG 19 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 20 and low-pressure steam in the steam generator low pressure 21.

Steam high pressure steam high pressure 7 served in the main steam line 33 of the base stations. Low pressure steam is directed through the steam line low pressure 5 in extra-burning chamber 16 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 22 irrigation water with a temperature of 20-30°applied to it by pipeline irrigation water 9 from the installation of softening raw water 41 block base stations 1.

Due to this, in the gas cooler-condenser 23 condense the steam component of the gas mixture. In the separation unit of the gas cooler-condenser 23 sephirot condensation of vapor-gas mixture and irrigation water from the products of combustion of the fuel is. The combustion products in the exhaust gas duct 24 with the exhauster discharge into the atmosphere, and the separated water through the pipeline 12 is served in a tank separated water 25.

A smaller part of the separated water in unit 4 magchat in softening filter feed water low pressure 26, dearyou in the tank 27 and the pipe 11 through the feed pump low pressure bring it to the entrance to the steam generator low pressure 21 boiler 19. Most pump separated water 28 serves on the pipeline 10 heating system through the deaerator in the return pipe network water in the base stations 1.

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

Combined with an open heating system contains a boiler, main steam, extraction steam turbine cogeneration steam extraction, high pressure deaerator, feed pump high pressure, open cogeneration system with network heaters, pipelines reverse and direct water network, characterized in that it is further provided with a block Progetto what Binney plant with post combustion of low pressure; the heat recovery unit gas mixture containing boiler with steam of high and extra-low steam generator pressure; irrigation device, a gas cooler-condenser; block the use of separated water, which the feedwater pipeline of low pressure through the installation of softening and deaerator connected with the inlet of the steam generator low pressure boiler; irrigation device is connected by pipeline with the installation of softening raw water base stations; in turn, the entrance of the steam generator high-pressure boiler is connected by pipeline gas mixture with access parogazoturbinnogo installation; steam generator low pressure boiler is connected by a steam line low pressure with additional afterburner parogazoturbinnogo installation; block the use of separated water piped softened and deaerated feed water low pressure heat recovery unit gas mixture and pipeline softened, heated and deaerated make-up water with an open heating system base stations; steam generator high pressure is connected by piping feedwater high pressure and high-pressure steam from the basic teploelektrocentral is updated.



 

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