CN109578098A - The Natural Gas Co-generation electrification technique of zero carbon emission - Google Patents
The Natural Gas Co-generation electrification technique of zero carbon emission Download PDFInfo
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- CN109578098A CN109578098A CN201910034254.8A CN201910034254A CN109578098A CN 109578098 A CN109578098 A CN 109578098A CN 201910034254 A CN201910034254 A CN 201910034254A CN 109578098 A CN109578098 A CN 109578098A
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- Prior art keywords
- gas
- natural gas
- vapor
- oxygen
- flue gas
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/04—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for the fluid being in different phases, e.g. foamed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
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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]
Abstract
The present invention provides the Natural Gas Co-generation electrification technique of zero carbon emission, and the forced air of Leng Huanhou enters air separation unit, and liquid oxygen is for combustion power generation, the elelctrochemical power generation of liquid nitrogen expansion of vapo(u)r and as coolant and forced air and flue gas heat exchange；Natural gas and oxygen and circulation vapor enter gas turbine combustion jointly and push compressor and generator high speed rotation, compressor compressed air to 0.5-0.8MPa, and generator generates electric power；High-temp combustion flue gas and high pressure water heat exchange generate vapor, partially as circulation vapor, are partially used for heat supply；Change rear flue gas utilization liquid oxygen and liquid nitrogen classification cooled dehydrated and distillation separation CO2, water pressurization in part, which returns, generates high-pressure water vapor, CO2Product is sold outside.
Description
1. technical field
The present invention provides the Natural Gas Co-generation electrification technique of zero carbon emission, belongs to gas utilization field.
2. background technique
Main clean energy resource one of of the natural gas as the world, it is easy to use, particularly suitable as distributed energy and combustion
Gas power generation.Natural gas fuel gas is discharged almost without dust (PM2.5), SO2It discharges extremely low, is filled through low NO and denitrating flue gas
It is very low to postpone NOx emission, CO2The discharge of isothermal chamber gas is also the half or so of coal-burning power plant, and environment-friendly advantage is very prominent.
Natural gas fuel power generation is conventional all to use Gas-steam Combined Cycle mode, and combined cycle generation is followed by Bretton
Ring and Rankine cycle form, and current gas turbine inlet air temperature may be up to 1300 DEG C or more, and 500~600 DEG C of exhaust gas temperature, simply
Thermal efficiency of cycle is up to 45%~50%；Waste heat boiler is further recovery waste heat, improves the thermal efficiency, generally double pressures or three pressures
System.Especially contemporary 9F grades of integrated gas-steam combined cycle power plant thermals efficiency of large size are up to 58%~60%, are much higher than coal fired power generation
The thermal efficiency.Even if 600MW grades, 1000MW grades units of Thermal generation unit thermal efficiency ultra supercritical, generally 46%~48%, two
The class unit generation thermal efficiency differs 10~20 percentage points.
Conventional gas cogeneration process is that air is inhaled from the outside atmospheric environment in compressor, and calms the anger by axial-flow type
Machine step by step compression is allowed to be pressurized to 1.5-2.8MPa, while air themperature also correspondinglys increase；Excessive 1.5-2.8MPa compression is empty
Gas is pressed to combustion chamber and the natural gas of penetrating is mixed and burned generation high temperature and high pressure flue gas；Then high temperature and high pressure flue gas enters back into
The expansion work into turbine pushes turbine that compressor and generator is driven to rotate together at high speed, realizes the chemical energy of natural gas
It is partially converted into mechanical work, and exports electric work；High-temp combustion flue gas passes through waste heat steam boiler again and obtains high steam for vapour
Turbine power generation, last flue gas pass through denitration after with minimum discharge standard outlet；It is adjusted when peak regulation by gas turbine load variations
It is whole.In this way, the chemical energy of fuel is just converted into thermal energy by gas turbine, and partial heat energy is transformed into mechanical energy.Usually firing
In gas-turbine, compressor is driven by combustion gas turbine expansion work, it is the load of turbine.In simple cycle, turbine
The mechanical work of sending has 1/2 to 2/3 or so to be used to drive compressor, remaining 1/3 or so mechanical work is used to driven generator.
When gas turbine starts, it is necessary first to which exterior power, usually starter drive compressor, until combustion gas turbine issues
Mechanical work when being greater than the mechanical work of compressor consumption, extraneous starter tripping, gas turbine itself could work independently.But it is existing
Having natural gas cogeneration technology there is further increasing, compressor compression ratio is difficult, process is complicated, CO2Trapping utilizes cost
High, highly water intensive, generating efficiency needs to be further increased, high fume temperature, NOx decrement are difficult, the cogeneration amplitude of accommodation is small, throws
Provide the defects of high.
3. summary of the invention
The object of the invention is to provide zero carbon row to overcome deficiency existing for conventional natural gas cogeneration technology
The Natural Gas Co-generation electrification technique put, had both solved that existing natural gas cogeneration technology is highly water intensive, the low problem of generating efficiency；
The load of high compression ratio compressor can be greatly lowered again, realize low cost CO2Trapping utilizes, the room temperature without Nox discharges, substantially
Degree improves generating efficiency；Can also simple flow, reduce investment, improve the adjustable range of cogeneration.
Technical solution of the present invention:
The purpose of the present invention is the liquid oxygen by air separation to be used for expansion power generation for combustion of natural gas power generation and liquid nitrogen
With refrigeration, high-temperature flue gas waste heat production vapor for heat supply and loop temperature-control power generation, flue gas classification cooled dehydrated and CO2Separation
The series technique of recycling purification etc. couples to improve natural gas cogeneration efficiency, and simple flow reduces investment, improves combustion gas wheel
Machine power realizes the clean and effective power generation without NOx pollution, without water consumption, zero carbon emission.It is characterized in that compressor is from ambient atmosphere
Environment sucks air, and is allowed to be pressurized to 0.5-0.8MPa by axial-flow compressor step by step compression, while air themperature also phase
It should improve for liquid oxygen or the liquid nitrogen preheating of pressurizeing；Change it is cold after 0.5-0.8MPa forced air enter air separation unit and carry out air point
From liquid oxygen and liquid nitrogen being obtained, after the pumping pressurization liquid oxygen of 1.5Mpa or more is by low-temperature flue gas or/and forced air heat exchange vaporization
It generates electricity for combustion of natural gas, the pressurization liquid nitrogen of pumping pushes nitrogen by low-temperature flue gas or/and forced air heat exchange expansion vaporization
Gas turbine generator power generation；High-pressure vaporization oxygen and circulation vapor are mixed with the natural gas of penetrating in the combustion chamber of gas turbine
Burning, then high temperature and pressure combustion product gases enter back into expansion work in turbine, and turbine is pushed to drive compressor and generator one
Superhigh speed rotation, the chemical energy for realizing natural gas is partially converted into mechanical work, and exports electric work；High-temp combustion flue gas passes through again
Waste heat boiler generates water vapour, and part vapor is partially used for vapor heat supply as circulation vapor；Low-temperature flue gas after heat exchange
CO is separated with liquid oxygen and liquid nitrogen classification cooled dehydrated and distillation again2, part deviates from water and pressurizes to obtain high pressure water return by water pump
Generate high-pressure water vapor, remaining water outlet.
Air separation is cryogenic air separation unit, pressure-variable adsorption separates step space division, UF membrane and the deep cooling combined with cryogenic separation
Separate combined one of step space division.
The mass ratio of oxygen and circulation vapor is 1:5-30.
In addition the heat exchange order of liquid oxygen and liquid nitrogen can be exchanged in the present invention.
The present invention carrys out embodiment to describe the features of the present invention in detail.
4. Detailed description of the invention
Attached drawing Fig. 1 is process schematic representation of the invention.
The drawing of attached drawing sets bright as follows:
1, air separation unit 2, gas pressure tank 3, compressor 4, waste heat boiler 5, generator 6, liquid oxygen heat exchanger
7, liquid nitrogen-flue gas heat-exchange unit 8, high-pressure hydraulic pump 9, gas turbine 10, liquid nitrogen-air heat exchanger 11, nitrogen turbine generator
12, destilling tower 13, liquid oxygen pump 14, liquid nitrogen pump
Process characteristic of the invention is described in detail with reference to the accompanying drawings and examples.
5. specific embodiment
Embodiment,
Air is inhaled from the outside atmospheric environment in the compressor (3) of gas turbine, and presses step by step by axial-flow compressor (3)
Contracting is allowed to be pressurized to 0.5-0.8MPa, while air themperature also correspondinglys increase, and send after being cooled down by liquid nitrogen-air heat exchanger (10)
Enter air separation unit (1) and carry out air separation, obtain liquid oxygen and liquid nitrogen, liquid oxygen pump (13) the pressurization liquid oxygen of 1.5Mpa or more is used for cigarette
The heat exchange of gas and combustion of natural gas power generation, liquid nitrogen pump (14) pressurization liquid nitrogen pass through liquid nitrogen-air heat exchanger (10) and liquid nitrogen-cigarette
The heat exchange of gas heat exchanger, expansion vaporization push outlet after nitrogen turbine generator (11) power generation；High-pressure vaporization oxygen and recirculated water steam
The natural gas that gas and gas pressure tank (2) spray into is mixed and burned in the combustion chamber of gas turbine (9), and then high temperature and pressure is burnt
Flue gas enters back into expansion work in turbine, pushes turbine that compressor (3) and generator (5) is driven to rotate together at high speed, and realizes
The chemical energy of natural gas is partially converted into mechanical work, and exports electric work；High-temp combustion flue gas passes through waste heat boiler (4) heat exchange again
Water vapour is generated, part vapor is partially used for vapor heat supply as circulation vapor；Low-temperature flue gas passes through liquid again after heat exchange
Oxygen heat exchanger (6) and liquid nitrogen-flue gas heat-exchange unit (7) and liquid oxygen and liquid nitrogen, which are classified cooling and are dehydrated and distill by destilling tower (12), to be divided
From CO2, partially deviate from water by high-pressure hydraulic pump (8) pressurization and obtain high pressure water return generation high-pressure water vapor, remaining water outlet.
Air separation is cryogenic air separation unit, pressure-variable adsorption separates step space division, UF membrane and the deep cooling combined with cryogenic separation
Separate combined one of step space division.
The mass ratio of oxygen and circulation vapor is 1:5-30.
According to Aspen analog result, the Natural Gas Co-generation electrification technique of zero carbon emission combines hair with conventional natural gas
Power technology is compared, and compressor compression ratio is higher, and new process advantage is more obvious.
The Natural Gas Co-generation electrification technique of zero carbon emission provided by the present invention passes through sky by Aspen analog result
Current compressor compression ratio is dropped to 5-8 by 15-28 or so by separating device liquid oxygen liquid nitrogen low energy consumption pumping pressurization, makes Natural Gas
Energy consumption of the turbine for compressor falls below 10% or so by 1/2-2/3；Natural gas and high-pressure steam mixing, oxygen help
Combustion power generation, flue gas specific volume increase, gas turbine power generation efficiency and the opposite raising of power；High-temperature flue gas heat exchange generates vapor and is used for
Circulating temperature-regulating power generation and heat supply, exhaust gas temperature drop to 60 DEG C or so by current 140 DEG C or so, and energy recovery rate greatly improves, cigarette
Gas is easy to low cost and is dehydrated isolated CO2, CO2Trapping energy consumption is greatly lowered；Burning generates water section circulation and is used for combustion gas wheel
Machine temperature control and cogeneration use high pressure water closed cycle to dissolve the highly water intensive problem of natural gas power, are particularly suitable for northwest water shortage
Area；Gas turbine comburant oxygen and water steam temperature control avoid the NOx emission, substantially of current Natural Gas Power Plant flue gas
Degree reduces the discharge of flue dust, realizes the power generation of zero carbon emission of natural gas clean and effective；Nitrogen vaporized expanding turbine generation simultaneously
Machine generates electricity and is used for space division air cooling, and water circulation and the pumping pressurization of liquid oxygen liquid nitrogen, considerably reduce internal system in addition
Energy consumption, system net generating efficiency are greater than 60%, and it is 0-50% that heat supply ratio, which is expanded, and investment is sent out with conventional natural gas-Steam Combined
Electric installation is compared to 20% or more reduction.
Claims (3)
1. the Natural Gas Co-generation electrification technique of zero carbon emission, technical characteristic is that sky is inhaled from the outside atmospheric environment in compressor
Gas, and be allowed to be pressurized to 0.5-0.8MPa by axial-flow compressor step by step compression, while air themperature is also correspondinglyd increase and is used for
Pressurization liquid oxygen or liquid nitrogen preheating；Change it is cold after 0.5-0.8MPa forced air enter air separation unit carry out air separation, obtain liquid
The pumping pressurization liquid oxygen of oxygen and liquid nitrogen, 1.5Mpa or more is natural by being used for after low-temperature flue gas or/and forced air heat exchange vaporization
The pressurization liquid nitrogen of gas combustion power generation, pumping pushes nitrogen turbine hair by low-temperature flue gas or/and forced air heat exchange expansion vaporization
Electric power generation；High-pressure vaporization oxygen and circulation vapor and the natural gas of penetrating are mixed and burned in the combustion chamber of gas turbine, so
High temperature and pressure combustion product gases enter back into expansion work in turbine afterwards, and turbine is pushed to drive compressor and the rotation of one superhigh speed of generator
Turn, the chemical energy for realizing natural gas is partially converted into mechanical work, and exports electric work；High-temp combustion flue gas passes through waste heat boiler again
Water vapour is generated, part vapor is partially used for vapor heat supply as circulation vapor；After heat exchange low-temperature flue gas again with liquid oxygen
With liquid nitrogen classification cooled dehydrated and distillation separation CO2, part deviates from water and pressurizes to obtain high pressure water return generation high pressure by water pump
Water vapour, remaining water outlet.
2. the Natural Gas Co-generation electrification technique of zero carbon emission according to claim 1, it is characterised in that air separation
For the step sky that cryogenic air separation unit, pressure-variable adsorption separate the step space division combined with cryogenic separation, UF membrane is combined with cryogenic separation
One of point.
3. the Natural Gas Co-generation electrification technique of zero carbon emission according to claim 1, it is characterised in that oxygen with follow
The mass ratio of ring vapor is 1:5-30.
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| CN201910034254.8A CN109578098A (en) | 2019-01-15 | 2019-01-15 | The Natural Gas Co-generation electrification technique of zero carbon emission |
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| CN201910034254.8A CN109578098A (en) | 2019-01-15 | 2019-01-15 | The Natural Gas Co-generation electrification technique of zero carbon emission |
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Cited By (2)
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| CN111894735A (en) * | 2020-07-08 | 2020-11-06 | 南京工程学院 | No-NO (nitric oxide)xDischarged hydrogen gas turbine combined cycle poly-generation method |
| CN113137294A (en) * | 2021-04-25 | 2021-07-20 | 广州市深发机电实业发展有限公司 | Integrated multifunctional integrated gas power generation system |
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