CN104533621B - A kind of double fuel steam injection forward and reverse Gas Turbine Combined-cycle - Google Patents
A kind of double fuel steam injection forward and reverse Gas Turbine Combined-cycle Download PDFInfo
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- CN104533621B CN104533621B CN201510005310.7A CN201510005310A CN104533621B CN 104533621 B CN104533621 B CN 104533621B CN 201510005310 A CN201510005310 A CN 201510005310A CN 104533621 B CN104533621 B CN 104533621B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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Abstract
One uses cleaning fuel and biomass dual-fuel steam injection forward and reverse Gas Turbine Combined-cycle, and gas turbine uses backheating type steam injection against the form of Gas Turbine Combined-cycle, uses cleaning fuel；The biomass fuel flue gas produced first indirectly heating of burning in the boiler enters the air of gas-turbine combustion chamber, then preheating enters the air of boiler.Wherein, the steam that gas turbine cycle produces can be used for external heat supply.The present invention utilizes the cascade utilization principle of energy, by the system integration, outer burning method and advanced steam injection forward and reverse Bradenton circulation are combined, the efficiency of energy utilization of biomass fuel can be greatly improved, biomass are adjustable with the ratio of cleaning fuel, and realize the self-balancing of steam injection water consumption and recycle-water.
Description
Technical field
The present invention relates to gas turbine technology field, particularly a kind of double fuel steam injection forward and reverse combustion gas wheel
Machine combined cycle.
Background technology
Simple cycle gas turbine engine is made up of compressor, combustor and combustion gas turbine (abbreviation turbine).
Compressor sucks air continuously from air and compresses it.Air after compression enters combustor,
Fuel mixing after-combustion with spraying into, becomes high-temperature fuel gas, flows into expansion working in turbine immediately, pushes away
Dynamic turbo wheel rotates together with compressor impeller, complementary work as gas turbine output mechanical power also
Electric power can be produced.Fuel gas temperature before turbine import is referred to as combustion gas initial temperature.For making full use of gas turbine
Exhaust heat, typically waste heat boiler is set at gas turbine rear portion, is used for producing steam and at steamer
Machine does work, the most i.e. constitutes Gas-steam Combined Cycle.
When the combustor of the steam-recycling that boiler is produced to gas turbine, with combustion gas mixing heating, swollen
Swollen acting, i.e. constitutes steam injected cycle.Compared with combined cycle, the feature of steam injected cycle and advantage
The most prominent: the efficiency of steam injected cycle is slightly lower, but higher than merit；Owing to steam-recycling inhibits combustion
The generation of burning process nitrogen oxides, pollutant emission reduces；Eliminate steam turbine and condenser etc.,
System structure is simple, and cost declines；When the external heat supply of the steam that waste heat boiler is produced, Ji Keshi
Existing cogeneration, and thermoelectricity range of accommodation is big；Start and close down quickly, simple to operate, easy care；Portion
Divide load performance good, strong to the fast tracking capability of load；Floor space is little.On the other hand, due to
Air wetting, water (steam) is followed smoke evacuation and is together discharged to air, and system needs to supplement constantly newly
Water, needs to consume a large amount of water, and recycle-water to be reached is big with the input of water consumption self-balancing, and difficulty is high.This
Hinder the development of steam injected cycle to a certain extent.
Generally, from the most a little higher than atmospheric pressure of pressure of the flue gas that turbine is discharged, wherein exceed
Part is only used for the exhaust resistance overcoming the parts such as rear portion waste-heat recovery device to produce.Now, combustion gas wheel
Machine circulation is forward (heat engine) circulation.When the pressure of the flue gas discharged by gas turbine turbine deliberately sets
It is set to below atmospheric pressure, afterwards followed by isobaric cooling procedure and a compression process of a flue gas
Time, gas turbine forward circulation and inverse compression process by top i.e. constitute so-called forward and reverse combustion gas wheel
Machine combined cycle.The existence of the isobaric cooling procedure before recompressing due to flue gas, the moisture content in flue gas coagulates
Knot, flue gas flow declines, and flue gas recompresses the wasted work of atmospheric pressure much smaller than flue gas from subatmospheric
It expand into subatmospheric expansion work from atmospheric pressure in turbine；Owing to there is inverse circulation, circulation
Optimize pressure ratio to decline；Owing to pressure ratio declines, the work done during compression of fuel reduces.Due to the existence of these factors,
Under equal conditions, the forward circulation that whole combined cycle efficiency can be made more simple improves about 1～2 hundred
Branch, the circulation high to steam content in flue gas, such as all kinds of fill cycle, steam injected cycle etc. especially
Effectively.Meanwhile, the water condensed in flue gas also can be complemented at circulation, significantly overcomes the circulation that need to consume water
Natural defect.
The utilization of energy of biomass fuel typically has burning, gasification two ways.The gas that gasification produces
Directly can use in the combustor of gas turbine or internal combustion engine, but remain gas after gasification at present
Purifying difficulty, whole gasification power generation system invests problem big, inefficient.Such as, to biomass
, the most there is the ability building MW level Biomass Gasification & Power Generation project, but system power supply efficiency in speech
It is only about 15%, and gasification technology is the strongest to the suitability of all kinds biomass.At biomass fuel
The burning Land use systems aspect of material, fluid bed or CFBB are owing to fuel tolerance is wide, combustion
Burn efficiency height, environmental-protecting performance highlights and (has benefited from the burning of relative low temperature, air stage feeding and desulfuration in furnace
Deng measure), peak modulation capacity is strong, performance driving economy high and there is the advantage of uniqueness.But,
It is limited by biomass fuel characteristic, ignition temperature, and is limited by the less system of the factors such as collect range
System scale, the biomass steam electricity generation system with CFBB as core there is also generating efficiency
Low shortcoming.At present, maximum biomass circulating fluidized bed combustion power generation system scale is about
130t/h, its power supplying efficiency is less than 32%.
Biomass combustion is combined with the gas turbine of high effect cleaning, is of biomass economy
New way.Wherein, research it is important that biomass external combustion gas turbine circulation, its integration mode one
As be: gas turbine turbine exhaust enter biomass boiler, biomass and combustion gas in biomass boiler
The high-temperature flue gas that turbine exhaust burning produces enters a high temperature gas-gas heat exchange device, adds hot-gas turbine and follows
Discharging the air by entering combustor in ring from compressor, essence is to replace gas turbine with biomass
Cleaning fuel originally.But, be limited to the material of high temperature gas-gas heat exchange device, heated after heat exchange
Device air exit temp typically can not surpass 900 DEG C, causes in the present state-of-the technology, and external-burning fires
The power supplying efficiency of gas-Steam Combined Cycle is not more than 32%.
Summary of the invention
It is an object of the invention to provide a kind of efficiency of energy utilization that biomass fuel is greatly improved
Double fuel steam injection forward and reverse Gas Turbine Combined-cycle, and realize circulation in steam injection water consumption and recovery
The self-balancing of water.
For achieving the above object, the double fuel steam injection forward and reverse of present invention offer is combustion turbine combined follows
Ring, including:
Air is entered by the air input of compressor；
The outfan of compressor inputs with the air input of combustion gas regenerator and the cooling air of turbine
End is connected；
The air outfan of combustion gas regenerator is connected with the air input of boiler gas-to-gas heat exchanger；
The air outfan of boiler gas-to-gas heat exchanger is connected with the air input of combustor, is used for heating
The cleaning fuel of air is entered by the fuel inlet port of combustor；
The flue gas outfan of combustor is connected with the flue gas input of turbine；
The flue gas outfan of turbine is connected with the flue gas input of combustion gas regenerator；
The flue gas outfan of combustion gas regenerator is connected with the flue gas input of superheater；
The flue gas outfan of superheater is connected with the flue gas input of vaporizer；
The flue gas outfan of vaporizer is connected with the flue gas input of economizer；
The flue gas outfan of economizer is connected with the heat smoke input of flue gas recuperator, and condensed water is from cigarette
Gas recuperator is derived；
The heat smoke outfan of flue gas recuperator is connected with the flue gas input of gas cooler, condensed water
Derive from gas cooler；
The flue gas outfan of gas cooler is connected with the flue gas input of scavenging compressor；
The flue gas outfan of scavenging compressor is connected with the cold flue gas input of flue gas recuperator, heated
Cold flue gas discharge emptying from the cold flue gas outlet side of flue gas recuperator；
Waste heat boiler feedwater is entered by the water input of economizer；
The water outfan of economizer is connected with the water input of vaporizer；
The saturated vapor outfan of vaporizer enters the saturated vapor outfan of superheater and is connected；
The superheated steam outfan of superheater is connected with the superheated steam input of combustor；
Waste heat boiler is formed by the superheater being sequentially connected, vaporizer, economizer；
Enter by the fuel inlet port of boiler for adding the biomass fuel of hot-air；
The flue gas outfan of boiler is connected with the flue gas input of boiler gas-to-gas heat exchanger；
The flue gas outfan of boiler gas-to-gas heat exchanger is connected with the flue gas input of boiler air preheater,
The flue gas emptying exported by the flue gas outfan of boiler air preheater；
Air needed for boiler combustion is entered by the air input of boiler air preheater；
The air outfan of boiler air preheater is connected with the air input of boiler；
Complementary work after the expansion work deduction compressor of turbine and the work done during compression of scavenging compressor promotes to be sent out
Motor rotation.
Wherein, the flue gas subatmospheric power of turbine outlet, is 0.1～0.95bar.
Wherein, flue gas recuperator, gas cooler are equipped with condensate water recovery device, the condensation of recovery
Water can be used as the feedwater of waste heat boiler after treatment.
Wherein, gas cooler is provided with cooling water cooler, the water input of cooling water cooler and cigarette
The water outfan of Gas Cooler connects, and the water outfan of cooling water cooler is cooled down with flue gas by water pump
The water input of device connects.
Wherein, it is provided with between flue gas outfan and the flue gas input of scavenging compressor of gas cooler
Water droplet filter, the flue gas outfan of gas cooler by after water droplet filter with scavenging compressor
Flue gas input is connected.
Wherein, the superheated steam produced from superheater introduces combustor, for external heat supply.
Wherein, boiler refers to fuel and air adiabatic combustion wherein and does not the most arrange the stream of water-cooling wall
Changing bed or CFBB, the fire box temperature of boiler is 650-850 DEG C.
Wherein, fluid bed or CFBB are added with desulfurizing agent.
Wherein, cleaning fuel includes natural gas, synthesis gas, liquefied petroleum gas, all kinds of distilled oil, first
One or more in alcohol, ethanol.
Compared with prior art, present invention have the advantage that
1) due to the comprehensive employing of the measures such as steam injected cycle, combustion gas backheat, forward and reverse cycle coupling,
Gas Turbine Combined-cycle efficiency is greatly improved, and discharge reduces；
2) the boiler smoke inlet temperature of boiler gas-gas heater is up to 850 DEG C, prior art water
Flat completely it is achieved that thus outer burning method and high-efficiency gas turbine are circulated and combine, make
The equivalent generating efficiency obtaining biomass is greatly improved；
3) turbine exit gas is cooled, and a large amount of water-settings go out, and can realize steam injection water consumption and recycle-water
Self-balancing.
4) combustion turbine exhaustion is not relied on due to the air required for biomass fuel combustion, biological
Matter fuel can change when system designs in the larger context with the ratio of cleaning fuel, with reply not
Same fuel supply condition.Calculating shows, the two kinds of fuel combustion releases of biomass fuel and cleaning fuel
Heat can change between 1 to 0.1 than about, and this ratio is the lowest, the equivalent generating effect of biomass
Rate is the highest.
In a word, the present invention utilizes the cascade utilization principle of energy, and the energy of biomass fuel can be greatly improved
Utilization ratio, biomass are adjustable with the ratio of cleaning fuel, and ensure the self-balancing of recycle-water and water consumption.
Accompanying drawing explanation
Fig. 1 is showing of the double fuel steam injection forward and reverse Gas Turbine Combined-cycle specific embodiment of the present invention
It is intended to；
Fig. 2 is the double fuel steam injection forward and reverse Gas Turbine Combined-cycle workflow signal of the present invention
Figure.
Symbol description in accompanying drawing:
Compressor 1, combustor 2, turbine 3, superheater 4, vaporizer 5, economizer 6, flue gas
Recuperator 7, gas cooler 8, water droplet filter 9, scavenging compressor 10, water pump 11, cooling
Water cooler 12, combustion gas regenerator 13, boiler 14, boiler gas-gas heater 15, boiler air is pre-
Hot device 16, electromotor 17.
Detailed description of the invention
Refer to Fig. 1, the double fuel steam injection forward and reverse Gas Turbine Combined-cycle of the present invention, comprising:
Air is entered by the air input of compressor 1；The outfan of compressor 1 and combustion gas regenerator
The air input of 13, the cooling air input of turbine 3 are connected；The air of combustion gas regenerator 13
Outfan is connected with the air input of boiler gas-to-gas heat exchanger 15；Boiler gas-to-gas heat exchanger 15
Air outfan is connected with the air input of combustor 2；For adding the cleaning fuel of hot-air by firing
The fuel inlet port burning room 2 enters；The flue gas outfan of combustor 2 and the flue gas input of turbine 3
It is connected；The flue gas outfan of turbine 3 is connected with the flue gas input of combustion gas regenerator 13；Combustion gas is returned
The flue gas outfan of hot device 13 is connected with the flue gas input of superheater 4；The flue gas of superheater 4 is defeated
Go out end to be connected with the flue gas input of vaporizer 5；The flue gas outfan of vaporizer 5 and economizer 6
Flue gas input is connected；The flue gas outfan of economizer 6 and the heat smoke input of flue gas recuperator 7
It is connected, the superheater 4 being sequentially connected, vaporizer 5 and economizer 6 constitutes waste heat boiler；Cold
Solidifying water is derived from flue gas recuperator 7；The heat smoke outfan of flue gas recuperator 7 and gas cooler
The flue gas input of 8 is connected；Condensed water is derived from gas cooler 8；The cigarette of gas cooler 8
Gas outfan is connected with the flue gas input of water droplet filter 9；The flue gas outfan of water droplet filter 9
It is connected with the flue gas input of scavenging compressor 10；The flue gas outfan of scavenging compressor 10 and flue gas
The cold flue gas input of recuperator 7 is connected；Heated cold flue gas is from the cold flue gas of flue gas recuperator 7
Outlet side discharges emptying；Waste heat boiler feedwater is entered by the water input of economizer 6；Economizer 6
Water outfan is connected with the water input of vaporizer 5；It is overheated that the saturated vapor outfan of vaporizer 5 enters
The saturated vapor outfan of device 4 is connected；The superheated steam outfan of superheater 4 and the mistake of combustor 2
Vapours input is connected；The superheated steam of superheater 4 output can also be used for external heat supply；Water pump 11
Water outfan be connected with the water input of cooling water cooler 12；The water of cooling water cooler 12 is defeated
Go out end to be connected with the water input of gas cooler 8, in order to recycle cooling water；Gas cooler
The water outfan of 8 is connected with the water input of water pump 11；For adding the biomass fuel of hot-air by pot
The fuel inlet port of stove 14 enters；The flue gas outfan of boiler 14 and boiler gas-to-gas heat exchanger 15
Flue gas input is connected；The flue gas outfan of boiler gas-to-gas heat exchanger 15 and boiler air preheater 16
Flue gas input be connected；The flue gas emptying exported by the flue gas outfan of boiler air preheater 16；
Air needed for boiler combustion is entered by the air input of boiler air preheater 16；Boiler air
The air outfan of preheater 16 is connected with the air input of boiler 14；Gas turbine turbine 3
Complementary work pushing generator 17 after the work done during compression of expansion work deduction compressor 1 and scavenging compressor 10
Operating.
On the basis of the above, the flue gas recuperator of the present invention, gas cooler are equipped with condensing hot air furnace
Device, in order to the Water Sproading that the water vapour in flue gas is condensed at flue gas recuperator, gas cooler,
Reduce the consumption of steam injected cycle water.
Present invention additionally comprises water droplet filter, this water droplet filter is located at gas cooler and is compressed with aerofluxus
Between machine, the flue gas outfan of gas cooler is by input with scavenging compressor after water droplet filter
End is connected, in order to the water droplet in flue gas before filtration entrance scavenging compressor, reduces water droplet and compresses aerofluxus
The infringement of machine.
The superheated steam that the present invention produces from waste heat boiler can introduce described combustor it can also be used to right
Outer heat supply, it is achieved cogeneration.
Refer to Fig. 2, be the work of the double fuel steam injection forward and reverse Gas Turbine Combined-cycle of the present invention
Schematic flow sheet.
In steam injection forward and reverse Gas Turbine Combined-cycle, compressor is for sucking sky continuously from air
Gas, and by air compression pressurization, major part compressed air enters combustion gas regenerator, fraction compression sky
Gas enters turbine as cooling air；Combustor is for the chemical energy that will contain in the cleaning entered fuel
Being reacted by combustion chemistry, be transformed into heat energy, form high-temperature flue gas, high-temperature flue gas enters turbine；Thoroughly
Putting down and the energy in flue gas is converted into mechanical energy, a mechanical energy part is used for driving pressure mechanism of qi and exhaust pressure
Contracting machine, remainder becomes electric energy through electromotor again；The combustion turbine exhaustion of turbine outlet introduces combustion
Gas regenerator, the air entered by blower outlet for heating；Combustion out from combustion gas regenerator
Gas-turbine aerofluxus enters waste heat boiler, and waste heat boiler feedwater is heated to be superheated steam；From waste heat boiler
In combustion turbine exhaustion out enter combustion gas recuperator, the combustion gas wheel that will introduce from scavenging compressor
Machine heating exhaust gas；Gas cooler is entered from combustion gas recuperator combustion turbine exhaustion out；From flue gas
Cooler combustion turbine exhaustion out enters described scavenging compressor；From scavenging compressor out
Combustion turbine exhaustion enters flue gas recuperator, heated rear emptying；
Steam generator system is anti-by combustion chemistry for the chemical energy that will contain in the biomass fuel of entrance
Should, it is transformed into heat energy, forms high-temperature boiler flue gas；High-temperature boiler flue gas enters boiler gas-gas heater；
Boiler gas-gas heater is used for indirectly heating the air introduced from combustion gas regenerator, the air after heating
Introduce gas-turbine combustion chamber；The boiler smoke discharged from boiler gas-gas heater enters boiler air
Preheater；Boiler air preheater is for by the air heating needed for boiler combustion, the air after preheating
Introduce boiler；Boiler exhaust emptying through boiler air preheater output.
Through compressor compress after air except part for turbine cool down, remaining through combustion gas regenerator,
Boiler gas-gas heater heats indirectly, to reduce cleaning fuel consumption；Defeated through boiler gas-gas heater
The air gone out enters combustor and forms high-temperature flue gas, does work subsequently into turbine and drives electrical power generators
The gas turbine flue gas subatmospheric power of middle turbine outlet, goes out merit improving turbine；Export through turbine
Flue gas the boiler feedwater of waste heat boiler is heated into superheated steam, this superheated steam passes through waste heat boiler
Steam output end export and inject combustor, to improve the acting ability of gas turbine, and reduce combustion
Burn NO in the combustion process of roomXGeneration；The flue gas input flue gas recuperator of waste heat boiler output adds hot type
The relatively low flue gas of temperature of air compressor output, in order to enter air；Cigarette through the output of flue gas recuperator
Gas enters gas cooler cooling, for flue gas is cooled to near-ambient temperature, to reduce row subsequently
Air compressor work done during compression；Through the flue gas entrance scavenging compressor of gas cooler output, by flue gas compressor
Remain to more than atmospheric pressure to after the resistance overcoming flue gas recuperator, in order to fume emission.In boiler
High-temperature flue gas produced by biomass combustion initially enters boiler gas-gas heater, and heating enters combustor
Air, to replace the original cleaning fuel of gas turbine, and efficiently utilized by gas turbine cycle
The energy of biomass；Through the flue gas entrance boiler air preheater of boiler gas-gas heater output, heating
Enter the air of boiler, to improve boiler efficiency；Boiler smoke row through boiler air preheater output
Empty.
The ratio of the cooling air entering turbine in the present invention regard temperature before turbine, turbine cooling technology and
Fixed, it is typically 12%～25%；The pressure subatmospheric power of turbine outlet；The combustion of turbine outlet
Gas-turbine aerofluxus introduces combustion gas regenerator, and the air that heating is entered by blower outlet, to improve circulation
Efficiency；From combustion gas regenerator, combustion turbine exhaustion out enters waste heat boiler, is given by waste heat boiler
Water is heated to be superheated steam, superheated steam can introduce combustor for promoting turbine work done it can also be used to
Externally heat supply；From waste heat boiler, combustion turbine exhaustion out enters combustion gas recuperator, will be from aerofluxus
The combustion turbine exhaustion introduced in compressor reheats, and makes delivery temperature be higher than certain environmental protection and wants
Asking, the water vapour in flue gas condenses in flue gas recuperator, condenses water and is reclaimed；From combustion gas re-heat
Device combustion turbine exhaustion out enters gas cooler, flue gas is cooled to near-ambient temperature, to subtract
Few scavenging compressor work done during compression subsequently, the water vapour in flue gas continues to condense in gas cooler,
Condense water to be reclaimed；Cooling water is sent to cooling water cooler, and cooled cooling water sends flue gas again back to
Cooler, to recycle cooling water；The combustion turbine exhaustion of gas cooler output is through water droplet mistake
Filter, removes the water droplet in gas；Combustion turbine exhaustion entrance exhaust pressure through the output of water droplet filter
Contracting machine, is compressed to the resistance that be enough to overcome the flue gas recuperator flowed through thereafter to produce by combustion turbine exhaustion
The most a little higher than rear atmospheric pressure, to provide enough chimney driving force, beneficially flue gas spreads, and reaches ring
Guaranteed request；From scavenging compressor, combustion turbine exhaustion out enters flue gas recuperator, heated after
Emptying.The chemical energy contained in the biomass fuel of entrance is reacted by steam generator system by combustion chemistry,
Being transformed into heat energy, form high-temperature boiler flue gas, high-temperature boiler flue gas enters boiler gas-gas heater；Pot
Stove gas-gas heater is for indirectly heating the air introduced from combustion gas regenerator, and the air after heating draws
Enter gas-turbine combustion chamber, it is achieved gas turbine cycle and biomass combustion system integrated；From boiler
The boiler smoke discharged in gas-gas heater enters boiler air preheater；Boiler air preheater is used for
Being heated by air needed for boiler combustion, reduce flue gas loss, the air after preheating introduces boiler；Warp
The boiler exhaust emptying of boiler air preheater output.
The double fuel steam injection forward and reverse Gas Turbine Combined-cycle of the present invention includes techniques below link:
1) air compression: air flows through compressor boosting, and outlet temperature also raises, and needs wasted work；
2) burning: fuel is in combustor or boiler and air mixing occurs chemical reaction, chemical energy
Release, temperature raises；
3) combustion gas expansion work: high-temperature high-pressure fuel gas is expansion work in turbine, decrease temperature and pressure；
4) waste heat recovery: it is overheated that the combustion gas that turbine outlet band has surplus heat is produced by waste-heat recovery device
Steam, steam can inject combustor and in turbine subsequently expansion working, also can externally heat supply；
5) heat exchange: heat transmission between high temperature fluid and cryogenic liquid, it is achieved heat recovery and utilization
Purpose；
6) flue gas condensing: flue gas declines because of heat-exchange temperature, and the water vapour in flue gas is partly condensed,
Condensation process discharges latent heat；
7) water droplet filters: enter water droplet filter through overcooled air, except carry secretly in air
Water droplet, reduces the water droplet infringement to compressor.
8) flue gas is arranged to air.
Theoretical foundation and the principle of the double fuel steam injection forward and reverse Gas Turbine Combined-cycle of the present invention be:
1) extraction cycle: in simple cycle, turbine exhaust temperature is the most at a relatively high, takes away amount of heat.
And generally blower outlet air themperature is more much lower than turbine exhaust temperature.Turbine exhaust is allowed to lead to
Crossing regenerator first the air of blower outlet to be heated, then air enters back into combustor, then in combustion gas
The heat added in can saving combustor in the case of initial temperature is constant, thus improve cycle efficieny.
2) steam injected cycle: the steam-recycling produced by waste heat boiler after gas turbine is to gas turbine
Combustor, same to combustion gas mixing, the circulation of expansion work.Compared with combined cycle, steam injected cycle
Efficiency is slightly lower, higher than merit；Pollutant emission reduces；System structure is simple, and cost declines；Can realize
Cogeneration, and thermoelectricity range of accommodation is big；Start and close down quickly, simple to operate, easy care；Part
Load performance is good, strong to the fast tracking capability of load；Floor space is little.
3) forward and reverse coupling cycle: the pressure of the flue gas discharged by gas turbine turbine is deliberately set to greatly
Below atmospheric pressure, afterwards followed by isobaric cooling procedure and the combustion gas of a compression process of a flue gas
Turbine circulates.Circulating this, flue gas recompresses the wasted work of atmospheric pressure much smaller than cigarette from subatmospheric
Gas expand into subatmospheric expansion work from atmospheric pressure in turbine；Owing to there is inverse circulation, circulation
Optimization pressure ratio decline；Owing to pressure ratio declines, the work done during compression of fuel reduces.Under equal conditions, forward and reverse
The forward circulation that the efficiency of coupling cycle is more simple improves about 1～2 percentage point, contains steam in flue gas
Measure high circulation, as fill cycle, steam injected cycle etc. are particularly effective.Meanwhile, the moisture content of condensation can
Recycle；
4) external combustion gas turbine circulation: the solid fuel such as biomass, coal burns generation in the boiler
High-temperature flue gas indirectly heat enter gas-turbine combustion chamber air, then can substitute wholly or in part
The cleaning fuel that need to add in gas-turbine combustion chamber, thus realize the solid such as biomass, coal is fired
The efficient utilization of material.
The present invention is by gas turbine and circulation thereof and backheat, steam injection, forward and reverse cycle coupling, external combustion
Etc. technology organic integration, define and efficiency of energy utilization novel of biomass fuel can be greatly improved follow
Ring.Biomass Gasification & Power Generation that the equivalent generating efficiency of biomass of this circulation is more general, directly burn
The technical schemes such as generating, external combustion gas turbine generating are greatly improved.Further, since biomass fuel
Air required for burning does not relies on combustion turbine exhaustion, biomass fuel and the ratio cleaning fuel
Can change in the larger context when system designs, to tackle different fuel supply conditions, relatively one
As biomass combustion external combustion gas turbine circulation the most flexible.
The double fuel steam injection forward and reverse Gas Turbine Combined-cycle of the present invention, calculating shows, at ISO bar
Under part, compressor pressure ratio be 16, combustor exit temperature be 1260 DEG C, cooling air volume be pressure
The 18.65% of mechanism of qi total flow, steam pressure be 3.92Mpa, turbine expansion to 50kPa, regenerator
It is taken as 0.9, waste-heat boiler superheater and import flue gas with the heat exchange effective degree of boiler gas-gas heater
Approach temperature point is 60 DEG C, flue gas is cooled to 27 DEG C, boiler air before entering scavenging compressor
The heat exchange effective degree of preheater is taken as 0.8, compressor constant entropy adiabatic efficiency is taken as 0.88, turbine constant entropy
Under conditions of adiabatic efficiency is taken as 0.9, boiler flue gas outlet temperature is taken as 850 DEG C, at biomass fuel
When being 0.7 with the fuel energy ratio of cleaning fuel, the generating efficiency of whole blood circulation reaches 44.26%,
If the efficiency of the steam injected cycle under assuming equal conditions is 47.78%, then the equivalent generating effect of biomass
Rate reaches 39.21%, if assuming, the gasification of standard biologic matter, the efficiency of combustion power generation system are 32%, then
The generating efficiency raising of biomass fuel reaches 7.21%.Other condition is constant, at biomass fuel with clear
When the fuel energy ratio of clean fuel is 0.52,0.35,0.21,0.10, the generating of whole blood circulation
Efficiency reaches 45.54%, 47.53%, 48.54%, 49.60%, and the equivalent generating efficiency of biomass reaches
44.17%, 46.82%, 52.12%, 68.32%, the generating efficiency of more conventional biomass power generation system carries
Up to 12.17%, 14.81%, 20.12%, 36.32%.The amplitude that generating efficiency improves is taken turns because of combustion gas
Machine, biomass combustion condition etc. and different, but the suitability of the present invention is not by gas turbine model, capacity
And the restriction of biomass kind etc..
Embodiments of the present invention are not limited to this, according to the foregoing of the present invention, utilize this area
Ordinary technical knowledge and customary means, without departing under the present invention above-mentioned basic fundamental thought premise, this
Invention can also be made the amendment of other various ways, be replaced or change, and all falls within right of the present invention and protects
Within the scope of protecting.
Claims (10)
1. a double fuel steam injection forward and reverse Gas Turbine Combined-cycle, wherein:
Air is entered by the air input of compressor；
The outfan of compressor inputs with the air input of combustion gas regenerator and the cooling air of turbine
End is connected；
The flue gas outfan of combustor is connected with the flue gas input of turbine；
The flue gas outfan of turbine is connected with the flue gas input of combustion gas regenerator；
Enter by the fuel inlet port of boiler for adding the biomass fuel of hot-air；
It is characterized in that:
The outfan of compressor is connected with the cooling air input of turbine；
The air outfan of combustion gas regenerator is connected with the air input of boiler gas-to-gas heat exchanger；
The air outfan of boiler gas-to-gas heat exchanger is connected with the air input of combustor, is used for heating
The cleaning fuel of air is entered by the fuel inlet port of combustor；
The flue gas outfan of combustion gas regenerator is connected with the flue gas input of superheater；
The flue gas outfan of superheater is connected with the flue gas input of vaporizer；
The flue gas outfan of vaporizer is connected with the flue gas input of economizer；
The flue gas outfan of economizer is connected with the heat smoke input of flue gas recuperator；
Condensed water is derived from flue gas recuperator；
The heat smoke outfan of flue gas recuperator is connected with the flue gas input of gas cooler, condensed water
Derive from gas cooler；
The flue gas outfan of gas cooler is connected with the flue gas input of scavenging compressor；
The flue gas outfan of scavenging compressor is connected with the cold flue gas input of flue gas recuperator, heated
Cold flue gas discharge emptying from the cold flue gas outlet side of flue gas recuperator；
Waste heat boiler feedwater is entered by the water input of economizer, and waste heat boiler is overheated by be sequentially connected
Device, vaporizer, economizer form；
The water outfan of economizer is connected with the water input of vaporizer；
The saturated vapor outfan of vaporizer enters the saturated vapor outfan of superheater and is connected；
The superheated steam outfan of superheater is connected with the superheated steam input of combustor；
The flue gas outfan of boiler is connected with the flue gas input of boiler gas-to-gas heat exchanger；
The flue gas outfan of boiler gas-to-gas heat exchanger is connected with the flue gas input of boiler air preheater,
The flue gas emptying exported by the flue gas outfan of boiler air preheater；
Air needed for boiler combustion is entered by the air input of boiler air preheater；
The air outfan of boiler air preheater is connected with the air input of boiler；
Complementary work after the expansion work deduction compressor of turbine and the work done during compression of scavenging compressor promotes to be sent out
Motor rotation.
Double fuel steam injection forward and reverse Gas Turbine Combined-cycle the most according to claim 1, its
In, the flue gas subatmospheric power of turbine outlet.
Double fuel steam injection forward and reverse Gas Turbine Combined-cycle the most according to claim 2, its
In, turbine exiting flue gas pressure is 0.1～0.95bar.
Double fuel steam injection forward and reverse Gas Turbine Combined-cycle the most according to claim 1, its
In, flue gas recuperator, gas cooler are equipped with condensate water recovery device, and the condensed water of recovery is through place
The feedwater of waste heat boiler is can be used as after reason.
Double fuel steam injection forward and reverse Gas Turbine Combined-cycle the most according to claim 1, its
In, gas cooler is provided with cooling water cooler, and the water input of cooling water cooler cools down with flue gas
The water outfan of device connects, and the water outfan of cooling water cooler is by the water of water pump with gas cooler
Input connects.
Double fuel steam injection forward and reverse Gas Turbine Combined-cycle the most according to claim 1, its
In, it is provided with water droplet mistake between flue gas outfan and the flue gas input of scavenging compressor of gas cooler
Filter, the flue gas outfan of gas cooler is by defeated with the flue gas of scavenging compressor after water droplet filter
Enter end to be connected.
Double fuel steam injection forward and reverse Gas Turbine Combined-cycle the most according to claim 1, its
In, the superheated steam produced from superheater introduces combustor, for external heat supply.
Double fuel steam injection forward and reverse Gas Turbine Combined-cycle the most according to claim 1, its
In, boiler refer to fuel and air adiabatic combustion wherein and the fluid bed the most not arranging water-cooling wall or
CFBB, the fire box temperature of boiler is 650-850 DEG C.
Double fuel steam injection forward and reverse Gas Turbine Combined-cycle the most according to claim 8, its
In, fluid bed or CFBB are added with desulfurizing agent.
Double fuel steam injection forward and reverse Gas Turbine Combined-cycle the most according to claim 1, its
In, cleaning fuel includes natural gas, synthesis gas, liquefied petroleum gas, all kinds of distilled oil, methanol, second
One or more in alcohol.
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