CN108661732A - A kind of liquefied natural gas (LNG) production system of combustion gas-supercritical carbon dioxide combined power - Google Patents
A kind of liquefied natural gas (LNG) production system of combustion gas-supercritical carbon dioxide combined power Download PDFInfo
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- CN108661732A CN108661732A CN201810444579.9A CN201810444579A CN108661732A CN 108661732 A CN108661732 A CN 108661732A CN 201810444579 A CN201810444579 A CN 201810444579A CN 108661732 A CN108661732 A CN 108661732A
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- supercritical carbon
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 151
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 90
- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 89
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 75
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000002485 combustion reaction Methods 0.000 title claims description 26
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 213
- 239000003345 natural gas Substances 0.000 claims abstract description 104
- 239000007789 gas Substances 0.000 claims abstract description 42
- 239000000567 combustion gas Substances 0.000 claims abstract description 26
- 239000000446 fuel Substances 0.000 claims abstract description 12
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 48
- 239000012530 fluid Substances 0.000 claims description 36
- 239000007788 liquid Substances 0.000 claims description 26
- 239000001294 propane Substances 0.000 claims description 24
- 230000006835 compression Effects 0.000 claims description 20
- 238000007906 compression Methods 0.000 claims description 20
- 230000008676 import Effects 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 18
- 238000000926 separation method Methods 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 13
- 239000007791 liquid phase Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 239000012071 phase Substances 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 8
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 7
- 239000005977 Ethylene Substances 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 7
- 230000008901 benefit Effects 0.000 claims description 5
- 238000010248 power generation Methods 0.000 claims description 5
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 4
- 238000013459 approach Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000002737 fuel gas Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 238000005057 refrigeration Methods 0.000 description 4
- GCNLQHANGFOQKY-UHFFFAOYSA-N [C+4].[O-2].[O-2].[Ti+4] Chemical compound [C+4].[O-2].[O-2].[Ti+4] GCNLQHANGFOQKY-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 150000001335 aliphatic alkanes Chemical class 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000005183 dynamical system Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241000790917 Dioxys <bee> Species 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 230000005658 nuclear physics Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
-
- 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
-
- 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
- F01K13/00—General layout or general methods of operation of complete plants
-
- 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
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/08—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with working fluid of one cycle heating the fluid in another cycle
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
- F25J1/0095—Oxides of carbon, e.g. CO2
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses a kind of liquefied natural gas (LNG) production systems of combustion gas supercritical carbon dioxide combined power, wherein, middle gas turbine uses natural gas as fuel, for heat source realization combustion gas supercritical carbon dioxide combined cycle of the exhaust as supercritical carbon dioxide Bretton power cycle generating system of gas turbine, and the electric energy needed for the entire liquefied natural gas (LNG) production system of supply of electric power that combustion gas supercritical carbon dioxide combined cycle is produced.The present invention combines gas turbine generating system, supercritical carbon dioxide Bretton power cycle generating system and natural gas liquefaction production system, stable power supply is provided, whole system itself is supplied to use, fuel of the natural gas part for simultaneity factor production as combustion gas supercritical carbon dioxide combined cycle in system, remaining supply output, system whole efficiency is improved, while the production for the utilization of supercritical carbon dioxide Bretton power cycle and liquefied natural gas provides new thinking.
Description
Technical field
The present invention relates to a kind of liquefied natural gas (LNG) production systems of combustion gas-supercritical carbon dioxide combined power.
Background technology
Liquefied natural gas (Liquefied Natural Gas) abbreviation LNG, is a kind of nowadays fastest-rising combustion in the world
Material.LNG refers to liquified natural gas under the conditions of ultralow temperature (- 162 DEG C), low pressure (atmospheric pressure), and component is mainly：First
Alkane (CH4), LNG is colourless, tasteless, nontoxic and non-corrosive, and volume is about the 1/600 of homogenous quantities gaseous natural gas volume,
That is 600 cubic metres of natural gas can be obtained after every cubic metre of LNG gasification.The density of LNG is about the 45% of androgynous ponding.
Due to place of production difference, the ingredient of LNG can be also slightly changed, and wherein the variation range of methane is 85%~98%.This is just being also not
The different reason with the heating value of liquefied natural gas and rate of gasification in the place of production, density also will appear corresponding fluctuation.
For LNG in production by pretreatment, the content of methane is more than 90%.Its pollutant discharge amount, which has, greatly to drop
It is low.In addition, in city winter gas peak period, LNG can be as the important means of city gas peak shaving, so market is wide
It is wealthy.LNG as motor vehicle fuel, carbon monoxide, soot discharge capacity be greatly lowered, to improve environmental quality will play it is extremely heavy
The effect wanted.National Environment Policy Act is advised and the appearance of automobile exhaust emission standard provides wide hair for LNG development of automobile
Space is opened up, the fast development of auto industry is also promoted.
Basic research is the necessary guarantee of rapid industrial development, and the production domesticization of LNG industry is accelerated to give birth to the LNG for reducing China
Cost is produced, the raising of the LNG technical merits in China is promoted to be of great significance.In addition, LNG industry is one technology-intensive and high
The industry of added value, many equipment productions involved in its industrial chain, domestic industries will be stimulated by developing this industry
It grows rapidly.
Intend critical zone physical property jumping phenomenon using supercritical fluid, compressor set operating point is arranged attached in pseudo-critical temperature
The low density area after pseudo-critical temperature is arranged in heat exchanger operating point by close big density region, can ensure gas cooling
Under the premise of, compression power consumption is reduced, realizes higher efficiency.This property of supercritical fluid makes it as energy transformation working medium
When have apparent advantage.Carbon dioxide (CO2) due to its critical pressure rather moderate (7.38MPa), there is preferable stablize
Property and nuclear physics property, show the property and its nontoxic, rich reserves, day of inert gas within the scope of certain temperature
So characteristics such as presence, it is considered to be most one of the energy transmission of application prospect and energy transformation working medium.Due to overcritical dioxy
Change carbon (S-CO2) density is larger and without phase-change within the scope of certain operating parameter, therefore with S-CO2For working medium compressor set,
The dynamical systems device structure such as gas-turbine is compact, small volume.Each combination can be accounted for Brayton cycle with the electric power of output 20MW
With space, only there are four cubic meters.Supercritical carbon dioxide (S-CO2) Brayton cycle turbine is commonly used in large-scale heating power and core
Can be in terms of power generation, including next-generation power reactor, target be finally replaced steam-powered rankine cycle turbine (efficiency compared with
Low, there are corrosivity for hot conditions, simultaneously because needing very big turbine and condenser to handle extra steam, occupy empty
Between be 30 times).
Invention content
The purpose of the present invention is to provide one kind capable of improving system whole efficiency, while can be supercritical carbon dioxide
(S-CO2) Bretton (Brayton) power cycle with the combustion gas-supercritical carbon dioxide combined power for providing new approaches
Liquefied natural gas (LNG) production system.
The present invention adopts the following technical scheme that realize：
A kind of liquefied natural gas (LNG) production system of combustion gas-supercritical carbon dioxide combined cycle, including gas turbine power generation
System, supercritical carbon dioxide Bretton power cycle generating system and natural gas liquefaction production system；Wherein,
The gas turbine generating system includes compressor set, the compressed air outlet of compressor set and the pressure of burner
Contracting air intake connects, and the fuel inlet of burner is connected with the outlet of purified natural gas compressibility, purified natural gas pressure
The entrance of compression system and being exported for combustion engine natural gas gas for natural gas dryer connect；The outlet of burner and combustion gas turbine
Import connects, and the outlet of combustion gas turbine is connect with the import of heat exchanger group；
The supercritical carbon dioxide Bretton power cycle generating system includes heat exchanger group, the outlet of heat exchanger group
It is connected with the import of supercritical carbon dioxide turbine, the outlet of supercritical carbon dioxide turbine and the high temperature effluent of high temperature regenerator
Body inlet communication, the high temperature side fluid outlet of high temperature regenerator are connected to the high temperature side fluid inlet of cryogenic regenerator, and low temperature returns
The high temperature side fluid outlet of hot device is divided into two-way, all the way with the inlet communication of forecooler, another way with recompression unit import
Connection, the inlet communication of the outlet and main compressor group of forecooler, the outlet of main compressor group and the low temperature side of cryogenic regenerator
Fluid inlet is connected to, the outlet of the low temperature side fluid outlet of cryogenic regenerator and recompression unit converge afterwards with high temperature regenerator
Low temperature side fluid inlet is connected to, the inlet communication of the low temperature side fluid outlet and heat exchanger group of high temperature regenerator；
The natural gas liquefaction device system includes liquid separation tank, and the outlet of liquid separation tank is connected by pipe-and-filter entrance
It connects, the outlet of filter and de- CO2The import of tower connects, and takes off CO2The outlet of tower and the entrance of natural gas dryer connect, naturally
The outlet of gas dryer is connect with the entrance of middle pressure propane heat exchanger, the outlet of middle pressure propane heat exchanger and low-pressure propane heat exchanger
Entrance connection, low-pressure propane heat exchanger exit connect with the entrance of high-pressure natural gas separator, and high-pressure natural gas separator leads to
Piping is connect with low-pressure propane heat exchanger again, as the channel that liquid phase returns, the outlet of high-pressure natural gas separator and second
The import of alkene heat exchanger connects, and the outlet of ethylene heat exchanger is connect with the import of middle pressure LNG heat exchangers, middle pressure LNG heat exchangers
Outlet is connect with middle pressure natural-gas separator, and middle pressure natural-gas separator is connect with middle pressure LNG heat exchangers again by pipeline, is made
Outlet for the recovery approach of gas phase, middle pressure natural-gas separator is connect with the import of low pressure LNG heat exchangers, low pressure LNG heat exchange
The outlet of device is connect with the import of low pressure natural gas separator, and the outlet of low pressure natural gas separator connects with the import of LNG storage tanks
It connects, low pressure natural gas separator and LNG storage tanks are connect by pipeline with low pressure LNG heat exchangers, and low pressure LNG heat exchangers pass through pipeline
It is connect with middle pressure LNG heat exchangers.
The present invention, which further improves, to be, the combustion in the combustion gas-supercritical carbon dioxide Bretton combined cycle
Gas-turbine electricity generation system is provided with heat exchanger group after combustion gas turbine, realizes that combustion gas recompresses Bretton with supercritical carbon dioxide
Energy transmission between cycle.
The present invention, which further improves, to be, super in the combustion gas-supercritical carbon dioxide Bretton combined cycle
Critical carbon dioxide Bretton power cycle generating system is working medium using supercritical carbon dioxide, and to avoid Brayton cycle
There is folder point in middle heat exchanger, influences to exchange heat, reduction cycle efficieny, in the supercritical carbon dioxide Bretton power cycle in system
Using two regenerators, there is high temperature regenerator and cryogenic regenerator in the circulatory system.
The present invention, which further improves, to be, super in the combustion gas-supercritical carbon dioxide Bretton combined cycle
Critical carbon dioxide Bretton power cycle generating system is working medium using supercritical carbon dioxide, to make full use of carbon dioxide
Supercritical carbon dioxide Bretton power in the advantage that Near The Critical Point density is larger, required work done during compression is smaller, system follows
It is recycled using shunting recompression in ring, there is main compressor group and recompression two compressor group of unit in the circulatory system.
The present invention, which further improves, to be, first is equipped between the low-pressure propane heat exchanger and high-pressure natural gas
Throttle valve, is equipped with second throttle between middle pressure LNG heat exchangers and middle pressure natural-gas separator, low pressure LNG heat exchangers with it is low
Third throttle valve is installed between pressure natural-gas separator, to realize gas-liquid separation.
The present invention, which further improves, to be, via the gas fuel of purified natural gas compressibility compression and via pressure
The air of contracting unit compression is mixed and burned in the burner, is formed high-temperature fuel gas and is entered combustion gas turbine acting, drives gas turbine
Generating set generates electricity, and the exhaust of combustion gas turbine enters heat exchanger group and exchanges heat, and the steam exhaust after heat exchange is discharged from chimney；
The high temperature side that the CO 2 fluid of supercritical carbon dioxide turbine outlet is introduced into high temperature regenerator carries out heat release,
The high temperature side for entering cryogenic regenerator afterwards carries out heat exchange, and then, a part of fluid leads directly to recompression unit and compressed；Separately
Enter back into the compression of main compressor group after the first pre-cooled device cooling of a part of fluid, then by cryogenic regenerator backheat to it is direct
It is recompressed slightly the identical temperature of fluid of unit compression, after mixing, passes through high temperature regenerator together, heat exchanger group carries out hot friendship
It changes, finally flows into the acting of supercritical carbon dioxide turbine, realize closed cycle；
Wherein, it after raw natural gas enters natural gas liquefaction device system, initially enters in liquid separation tank removal unstripped gas
Liquid removes the natural gas after liquid and subsequently enters filter and filter out the big liquid and solid of grain size, filtered natural gas
Into de- CO2Tower removes CO with monoethanolamine process2, take off CO2Natural gas afterwards sieves drier with natural gas molecule and carries out at dehydration
Reason, purified natural gas, a part enter purified natural gas by natural gas dryer for the outlet of combustion engine natural gas gas
Compressibility, uses for combustion engine after compression, and rest part sequentially enters the middle pressure propane heat exchanger recycled using propane refrigeration
With low-pressure propane heat exchanger gas-liquid point is carried out into high-pressure natural gas separator then after first throttle valve throttling cooling
From, liquid phase is backflowed, cold recovery, and the gas phase of generation passes through ethylene heat exchanger successively and middle pressure LNG heat exchangers cool down, after cooling,
Throttling cooling is carried out using second throttle, natural-gas separator is pressed in entering after throttling cooling, is detached in middle pressure natural gas
The liquid phase generated in device further enters low pressure natural gas after low pressure LNG heat exchangers are cooling and third throttle valve throttles and detaches
Device, in low pressure natural gas separator, gas phase is backflowed, cold recovery, and liquid phase flows into LNG storage tank storage.
The present invention has following beneficial technique effect：
The present invention uses fuel of the natural gas as gas turbine, for gas turbine exhaust as overcritical titanium dioxide
Carbon (S-CO2) Bretton (Brayton) power cycle generating system power generation heat source realize combustion gas-supercritical carbon dioxide (S-
CO2) Bretton (Brayton) combined cycle, and combustion gas-supercritical carbon dioxide (S-CO2) Bretton (Brayton) combines and follow
The electric energy needed for the entire liquefied natural gas of supply of electric power (LNG) production system that ring is produced.The natural gas that system is produced, one
Fuel of the part as combustion gas-supercritical carbon dioxide combined cycle, uses, remaining natural gas liquid is turned to for system itself
LNG supply outputs, had not only provided stable power supply, but also improve the whole efficiency of system.Combine gas turbine power generation
System, supercritical carbon dioxide (S-CO2) Bretton (Brayton) power cycle generating system and natural gas liquefaction production system
System, provides stable power supply system, and the natural gas part that supply whole system itself is used, while being produced in system as firing
The fuel of gas-Steam Combined Cycle, remaining fluid turn to LNG supply outputs, improve system effectiveness, while being overcritical titanium dioxide
Carbon (S-CO2) utilization of Bretton (Brayton) power cycle and the production of liquefied natural gas provides new thinking.
Description of the drawings
Fig. 1 is schematic structural view of the invention；
In figure：1, compressor set, 2, burner, 3, combustion gas turbine, 4, Gas Turbine Generating Units, 5, heat exchanger group, 6,
High temperature regenerator, 7, cryogenic regenerator, 8, forecooler, 9, main compressor group, 10, recompression unit, 11, supercritical carbon dioxide
Turbine, 12, supercritical carbon dioxide turbine generators, 13, liquid separation tank, 14, filter, 15, de- CO2Tower, 16, natural gas drying
Device, 17, middle pressure propane heat exchanger, 18, low-pressure propane heat exchanger, 19, first throttle valve, 20, high-pressure natural gas separator, 21,
Acetylene heat exchanger, 22, middle pressure LNG heat exchangers, 23, second throttle, 24, middle pressure natural-gas separator, 25, low pressure LNG heat exchange
Device, 26, third throttle valve, 27, low pressure natural gas separator, 28, LNG storage tank, 29, purified natural gas compressibility.
Specific implementation mode
Referring to Fig. 1, a kind of liquefied natural gas (LNG) the production system of combustion gas-supercritical carbon dioxide combined power of the present invention
System；
The gas turbine generating system includes compressor set 1, burner 2, combustion gas turbine 3, gas turbine powered generator 4
It is connected to the entrance of burner 2 with the gas vent of 5 groups of heat exchanger, compressor set 1, fuel inlet and the purification day of burner 2
The outlet of right air pressure compression system 29 is connected；Via the fuel of the compression of purified natural gas compressibility 29 and via compressor set 1
The air of compression is mixed and burned in burner 2, and formation high-temperature fuel gas, which enters in combustion gas turbine 3, to do work, and drives gas turbine hair
Motor 4 generates electricity, and the exhaust of combustion gas turbine 3 enters heat exchanger group 5 and exchanges heat, and is discharged from chimney after heat exchange.
Supercritical carbon dioxide (the S-CO2) Bretton (Brayton) power cycle generating system includes heat exchanger
Group 5, high temperature regenerator 6, cryogenic regenerator 7, forecooler 8, main compressor group 9, recompression unit 10, supercritical carbon dioxide are saturating
Put down 11 and supercritical carbon dioxide turbine generators 12, the import of the outlet and supercritical carbon dioxide turbine 11 of heat exchanger group 5
It is connected, the outlet of supercritical carbon dioxide turbine 11 is connected to the high temperature side fluid inlet of high temperature regenerator 6, high temperature regenerator 6
High temperature side fluid outlet be connected to the high temperature side fluid inlet of cryogenic regenerator 7, the high temperature side fluid outlet of cryogenic regenerator 7
Be divided into two-way, all the way with the inlet communication of forecooler 8, another way with recompression unit 10 inlet communication, the outlet of forecooler 8
With the inlet communication of main compressor group 9, the outlet of main compressor group 9 is connected to the low temperature side fluid inlet of cryogenic regenerator 7, low
The low temperature side fluid outlet of warm regenerator 7 and the outlet of recompression unit 10 converge the low temperature side liquid with high temperature regenerator 6 afterwards
Inlet communication, the inlet communication of the low temperature side fluid outlet and heat exchanger 5 of high temperature regenerator 6；Supercritical carbon dioxide (S-CO2)
The high temperature side that the CO 2 fluid that turbine 11 exports is introduced into high temperature regenerator 6 carries out heat release, afterwards into cryogenic regenerator 7
High temperature side carries out heat exchange, and then, a part of fluid leads directly to recompression unit 10 and compressed；Another part fluid first flows into
Forecooler 8 cool down after, enter back into main compressor group 9 and compressed, then by the low temperature side backheat of cryogenic regenerator 7 to it is straight
The identical temperature of fluid for being recompressed slightly the compression of unit 10 is connect, passes through low temperature side, the heat exchange of high temperature regenerator 6 after mixing together
Device group 5 carries out heat exchange, finally flows into supercritical carbon dioxide (S-CO2) acting of turbine 11, supercritical carbon dioxide (S-CO2)
Turbine 11 drives supercritical carbon dioxide turbine generators 12 to generate electricity, and realizes closed cycle.
The natural gas liquefaction device system includes sequentially connected liquid separation tank 13, filter 14, de- CO2Tower 15, day
Right gas dryer 16, middle pressure propane heat exchanger 17, low-pressure propane heat exchanger 18, high-pressure natural gas separator 20, ethylene heat exchanger
21, middle pressure LNG heat exchangers 22, middle pressure natural-gas separator 24, low pressure LNG heat exchangers 25, low pressure natural gas separator 27 and LNG
Storage tank 28；After raw natural gas enters natural gas liquefaction device system, the liquid in the removal unstripped gas of liquid separation tank 13 is initially entered,
Natural gas after removal liquid filters out the big liquid and solid of grain size subsequently into filter 14, and filtered natural gas enters
De- CO2Tower 15 removes CO with monoethanolamine (MEA) method2, take off CO2Natural gas afterwards sieves drier 16 with natural gas molecule and is taken off
Water process.Purified natural gas, a part, which is exported by natural gas dryer 16 for combustion engine natural gas gas, enters purification
Opening natural gas compression system 29, uses for combustion engine after compression, and rest part sequentially enters the middle pressure third recycled using propane refrigeration
Alkane heat exchanger 17 and low-pressure propane heat exchanger 18, then after the throttling cooling of first throttle valve 19, into high-pressure natural gas point
Gas-liquid separation is carried out from device 20, liquid phase is backflowed, cold recovery, and the gas phase of generation passes through ethylene heat exchanger 21 and middle pressure LNG successively
Heat exchanger 22 cools down, and after cooling, carry out throttling cooling using second throttle 23, natural qi leel is pressed in entering after throttling cooling
From device 24, the liquid phase generated in middle pressure natural-gas separator 24 is further through the cooling of low pressure LNG heat exchangers 25 and third section
It flows after valve 26 throttles and enters low pressure natural gas separator 27, in low pressure natural gas separator 27, gas phase is backflowed cold recovery, liquid
LNG storage tank 28 is mutually flowed into store.
Supercritical carbon dioxide (the S-CO of the present invention2) in Bretton (Brayton) power cycle generating system, due to super
Critical carbon dioxide (S-CO2) density is larger and without phase-change within the scope of certain operating parameter, therefore with overcritical titanium dioxide
Carbon (S-CO2) be working medium the dynamical systems device structure such as compressor set, gas-turbine is compact, small volume, it is not only cost-effective, but also
Save space.
Supercritical carbon dioxide (S-CO2) in Bretton (Brayton) circulatory system, due to using improved recompression
Brayton cycle avoids the heat exchange folder point that simple Bretton (Brayton) cycle occurs, reduces showing for cycle efficieny in this way
As taking full advantage of supercritical carbon dioxide in its advantage that Near The Critical Point density is larger, required work done during compression is smaller.
In natural gas liquefaction device system, the characteristics of natural gas well itself high pressure can be made full use of (12MPa), with gas
Body pressure is energy, takes separation, dehydration, de- CO2, after the pretreatments such as de- heavy hydrocarbon, by classification refrigeration, partial liquefaction technique,
Make natural gas liquefaction.The technique has yield compared with " nitrogen+methane " hybrid refrigeration cycle technique of external generally use
Height, the features such as small investment, low energy consumption, operating cost is low, reliable for operation.
Claims (6)
1. a kind of liquefied natural gas (LNG) production system of combustion gas-supercritical carbon dioxide combined cycle, which is characterized in that including combustion gas
Turbine electricity generation system, supercritical carbon dioxide Bretton power cycle generating system and natural gas liquefaction production system；Wherein,
The gas turbine generating system includes compressor set (1), the compressed air outlet and burner of compressor set (1)
(2) compressed air inlet connection, the fuel inlet of burner (2) are connected with the outlet of purified natural gas compressibility (29)
It connects, the entrance of purified natural gas compressibility (29), which is exported with natural gas dryer (16) for combustion engine natural gas gas, to be connected；
The outlet of burner (2) is connect with the import of combustion gas turbine (3), and the outlet of combustion gas turbine (3) connects with the import of heat exchanger group (5)
It connects；
The supercritical carbon dioxide Bretton power cycle generating system includes heat exchanger group (5), and heat exchanger group (5) go out
Mouth is connected with the import of supercritical carbon dioxide turbine (11), outlet and the high temperature regenerator of supercritical carbon dioxide turbine (11)
(6) high temperature side fluid inlet connection, the high temperature side of the high temperature side fluid outlet and cryogenic regenerator (7) of high temperature regenerator (6)
Fluid inlet is connected to, and the high temperature side fluid outlet of cryogenic regenerator (7) is divided into two-way, all the way with the inlet communication of forecooler (8),
The inlet communication of another way and recompression unit (10), the inlet communication of the outlet and main compressor group (9) of forecooler (8) are main
The outlet of compressor set (9) is connected to the low temperature side fluid inlet of cryogenic regenerator (7), the low temperature effluent of cryogenic regenerator (7)
Body outlet is connected to after converging with the outlet of recompression unit (10) with the low temperature side fluid inlet of high temperature regenerator (6), and high temperature returns
The inlet communication of the low temperature side fluid outlet and heat exchanger group (5) of hot device (6)；
The natural gas liquefaction device system includes liquid separation tank (13), and the outlet of liquid separation tank (13) passes through pipe-and-filter
(14) entrance connects, outlet and the de- CO of filter (14)2The import of tower (15) connects, and takes off CO2The outlet of tower (15) and natural gas
The entrance of drier (16) connects, and the outlet of natural gas dryer (16) is connect with the entrance of middle pressure propane heat exchanger (17), in
Pressure propane heat exchanger (17) outlet connect with the entrance of low-pressure propane heat exchanger (18), low-pressure propane heat exchanger (18) export and
The entrance of high-pressure natural gas separator (20) connects, and high-pressure natural gas separator (20) is exchanged heat with low-pressure propane again by pipeline
Device (18) connects, as the channel that liquid phase returns, the outlet of high-pressure natural gas separator (20) and ethylene heat exchanger (21) into
Mouth connection, the outlet of ethylene heat exchanger (21) are connect with the import of middle pressure LNG heat exchangers (22), middle pressure LNG heat exchangers (22)
Outlet is connect with middle pressure natural-gas separator (24), and middle pressure natural-gas separator (24) is exchanged heat with middle pressure LNG again by pipeline
Device (22) connects, as the recovery approach of gas phase, outlet and the low pressure LNG heat exchangers (25) of middle pressure natural-gas separator (24)
Import connects, and the outlet of low pressure LNG heat exchangers (25) is connect with the import of low pressure natural gas separator (27), low pressure natural gas point
Outlet from device (27) is connect with the import of LNG storage tanks (28), and low pressure natural gas separator (27) and LNG storage tanks (28) pass through pipe
Road is connect with low pressure LNG heat exchangers (25), and low pressure LNG heat exchangers (25) are connect by pipeline with middle pressure LNG heat exchangers (22).
2. the liquefied natural gas (LNG) production system of combustion gas according to claim 1-supercritical carbon dioxide combined cycle, special
Sign is, the gas turbine generating system in the combustion gas-supercritical carbon dioxide Bretton combined cycle, after combustion gas turbine
It is provided with heat exchanger group (5), realizes the energy transmission between combustion gas and supercritical carbon dioxide recompression Brayton cycle.
3. the liquefied natural gas (LNG) production system of combustion gas according to claim 1-supercritical carbon dioxide combined cycle, special
Sign is that the supercritical carbon dioxide Bretton power in the combustion gas-supercritical carbon dioxide Bretton combined cycle follows
Ring electricity generation system is working medium using supercritical carbon dioxide, and to avoid heat exchanger in Brayton cycle from folder point occur, influences to change
Heat reduces cycle efficieny, two regenerators, the circulatory system is used in the supercritical carbon dioxide Bretton power cycle in system
In have high temperature regenerator (6) and cryogenic regenerator (7).
4. the liquefied natural gas (LNG) production system of combustion gas according to claim 1-supercritical carbon dioxide combined cycle, special
Sign is that the supercritical carbon dioxide Bretton power in the combustion gas-supercritical carbon dioxide Bretton combined cycle follows
Ring electricity generation system is working medium using supercritical carbon dioxide, to make full use of carbon dioxide Near The Critical Point density is larger, institute
The advantage that work done during compression is smaller is needed, is recycled using shunting recompression in the supercritical carbon dioxide Bretton power cycle in system,
There is main compressor group (9) and recompression (10) two compressor group of unit in the circulatory system.
5. the liquefied natural gas (LNG) production system of combustion gas according to claim 1-supercritical carbon dioxide combined cycle, special
Sign is, first throttle valve (19), middle pressure are equipped between the low-pressure propane heat exchanger (18) and high-pressure natural gas (20)
Second throttle (23), low pressure LNG heat exchangers (25) are installed between LNG heat exchangers (22) and middle pressure natural-gas separator (24)
Third throttle valve (26) is installed between low pressure natural gas separator (27), to realize gas-liquid separation.
6. the liquefied natural gas (LNG) production system of combustion gas according to claim 5-supercritical carbon dioxide combined cycle, special
Sign is, the gas fuel via purified natural gas compressibility (29) compression and the air that is compressed via compressor set (1)
It is mixed and burned in burner (2), forms high-temperature fuel gas and enter combustion gas turbine (3) acting, drive Gas Turbine Generating Units (4)
Power generation, the exhaust of combustion gas turbine (3) enter heat exchanger group (5) and exchange heat, and the steam exhaust after heat exchange is discharged from chimney；
The high temperature side that the CO 2 fluid of supercritical carbon dioxide turbine (11) outlet is introduced into high temperature regenerator (6) is put
Heat, the high temperature side for entering cryogenic regenerator (7) afterwards carry out heat exchange, and then, a part of fluid leads directly to recompression unit
(10) it is compressed；Another part fluid enters back into main compressor group (9) compression after first pre-cooled device (8) is cooling, then by low
Warm regenerator (7) backheat after mixing, passes through together to temperature identical with the fluid for being directly recompressed slightly unit (10) compression
High temperature regenerator (6), heat exchanger group (5) carry out heat exchange, finally flow into supercritical carbon dioxide turbine (11) and do work, realization is closed
Formula recycles；
Wherein, it after raw natural gas enters natural gas liquefaction device system, initially enters in liquid separation tank (13) removal unstripped gas
Liquid removes the natural gas after liquid and subsequently enters filter (14) and filter out the big liquid and solid of grain size, filtered day
Right gas, which enters, takes off CO2Tower (15) removes CO with monoethanolamine process2, take off CO2Natural gas afterwards sieves drier with natural gas molecule
(16) it is carried out dehydrating, purified natural gas, a part is by natural gas dryer (16) for combustion engine natural gas gas
Outlet enters purified natural gas compressibility (29), is used after compression for combustion engine, rest part, which sequentially enters, utilizes propane system
The middle pressure propane heat exchanger (17) of SAPMAC method and low-pressure propane heat exchanger (18) then pass through first throttle valve (19) throttling cooling
Afterwards, gas-liquid separation is carried out into high-pressure natural gas separator (20), liquid phase is backflowed, and the gas phase of cold recovery, generation is passed through successively
Ethylene heat exchanger (21) and middle pressure LNG heat exchangers (22) are cooling, and after cooling, throttling drop is carried out using second throttle (23)
Temperature, pressure natural-gas separator (24) in entering after throttling cooling press the middle liquid phase generated of natural-gas separator (24) into one middle
Step enters low pressure natural gas separator (27) after low pressure LNG heat exchangers (25) are cooling and third throttle valve (26) throttles,
In low pressure natural gas separator (27), gas phase is backflowed, cold recovery, and liquid phase flows into LNG storage tank (28) and stores.
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| CN111577414A (en) * | 2020-05-19 | 2020-08-25 | 西安石油大学 | Supercritical CO coupling separation of LNG light hydrocarbon2Recompression brayton/kalina combined cycle power generation system |
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| CN113586187A (en) * | 2021-06-07 | 2021-11-02 | 浙江大学 | Rankine cycle system and Rankine cycle method |
| WO2023024962A1 (en) * | 2021-08-26 | 2023-03-02 | 比亚迪股份有限公司 | Supercritical carbon dioxide cycle based power generation-brine lithium extraction coupling system |
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