CN103983084A - Natural gas pressure energy comprehensive utilization complete equipment - Google Patents
Natural gas pressure energy comprehensive utilization complete equipment Download PDFInfo
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- CN103983084A CN103983084A CN201410207334.6A CN201410207334A CN103983084A CN 103983084 A CN103983084 A CN 103983084A CN 201410207334 A CN201410207334 A CN 201410207334A CN 103983084 A CN103983084 A CN 103983084A
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- Prior art keywords
- natural gas
- heat exchanger
- knockout drum
- pressure energy
- injector
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 198
- 239000003345 natural gas Substances 0.000 title claims abstract description 96
- 238000005057 refrigeration Methods 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 7
- 239000003507 refrigerant Substances 0.000 claims description 5
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N benzene Substances C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 23
- 239000007788 liquid Substances 0.000 abstract description 11
- 238000000926 separation method Methods 0.000 abstract description 11
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000010248 power generation Methods 0.000 abstract description 2
- 239000002826 coolant Substances 0.000 abstract 2
- 230000009977 dual effect Effects 0.000 abstract 1
- 239000003949 liquefied natural gas Substances 0.000 description 23
- 238000000034 method Methods 0.000 description 7
- 230000005611 electricity Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 210000000038 chest Anatomy 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
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- 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
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
- F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
-
- 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
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
- F25J1/0035—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work
- F25J1/0037—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by gas expansion with extraction of work of a return stream
-
- 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
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
- F25J1/0208—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle in combination with an internal quasi-closed refrigeration loop, e.g. with deep flash recycle loop
-
- 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
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
- F25J1/0232—Coupling of the liquefaction unit to other units or processes, so-called integrated processes integration within a pressure letdown station of a high pressure pipeline system
-
- 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
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/06—Splitting of the feed stream, e.g. for treating or cooling in different ways
-
- 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
- F25J2240/00—Processes or apparatus involving steps for expanding of process streams
- F25J2240/60—Expansion by ejector or injector, e.g. "Gasstrahlpumpe", "venturi mixing", "jet pumps"
-
- 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
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
Natural gas pressure energy comprehensive utilization complete equipment comprises a gas inlet, an output port, a first heat exchanger, a second heat exchanger, a first gas liquid separation tank, a second gas liquid separation tank, a third gas liquid separation tank and a fourth gas liquid separation tank; a first ejector is connected onto the passage between the second heat exchanger and the first gas liquid separation tank; a connection passage is formed between the third gas liquid separation tank and the second heat exchanger and is provided with a second ejector; one path of natural gas enters a screw expander and the other path of natural gas enters a boosting compressor of a natural gas liquefying device; the boosting compressor is connected with a circulation compressor in parallel; the natural gas from the boosting compressor and the natural gas from the circulation compressor converge and then enter a precooling heat exchanger; the screw expander is provided with a user interface and a coolant interface; the coolant interface is connected with the precooling heat exchanger. The natural gas pressure energy comprehensive utilization complete equipment has the advantages that the dual functions of power generation and natural gas liquefying are realized, so the comprehensive utilization rate of the natural gas pressure energy is higher, and the equipment can also be used for the peak shaving of a natural gas pipeline network, ensures the stable supply of the natural gas and achieves the aims of energy saving and environment friendliness.
Description
Technical field
The present invention relates to a kind of natural gas liquefaction system technical field; Specifically refer to that a kind of pressure energy of natural gas that utilizes pressure energy in Gas Exploitation gas well and natural gas accumulating to generate electricity and to produce the combined cycle process of liquefied natural gas (LNG) fully utilizes complexes.
Background technology
At present, the pressure of Gas Exploitation gas well is all very high, could accumulating after dedusting, dehydration, step-down and enter Trunk-line from described gas recovery well natural gas; The pressure energy that described step-down process produces has lost in vain, does not obtain up to now effective utilization.
Moreover the gas pressure that described gas trunklines enters urban gate station is 5.5～4MPa, be depressurized to 1.6～2.0MPa through urban gate station, or be down to 0.2～0.4MPa, this part pressure energy has also lost in vain, very unfortunate.This part pressure energy is not nearly all recycled at domestic all natural valves station at present; Thereby this part pressure energy of researches and exploitation is an important topic in current pressure energy of natural gas comprehensive utilization.
Chinese invention patent number 200910103373.0 " a kind of ice chests for natural gas liquefaction system ", comprising precooling unit and the first knockout drum, the second knockout drum, the 3rd knockout drum and the 4th knockout drum of inlet, delivery outlet, First Heat Exchanger, the second heat exchanger and refrigeration machine, on the path between described the second heat exchanger and described the first knockout drum, be connected with the first injector, between described the 3rd knockout drum and described the second heat exchanger, form interface channel, on this interface channel, be provided with the second injector.
The advantage of this patent of invention 200910103373.0 " a kind of ice chest for natural gas liquefaction system " is that structure is comparatively simple, energy consumption is less; But the weak point of this patent of invention is not with respect to the innovation aspect pressure energy of natural gas comprehensive utilization and the economical and technical benefit that may bring thereof.
Summary of the invention
Technical problem to be solved by this invention is the situation for prior art, provides a kind of and has not only had excellent natural gas liquefaction function, but also realizes pressure energy of natural gas and fully utilize the pressure energy of natural gas comprehensive utilization complexes of the economical and technical benefit bringing.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of pressure energy of natural gas comprehensive utilization complexes, comprise inlet, delivery outlet, the first heat exchanger, the precooling unit of the second heat exchanger and refrigeration machine and the first knockout drum, the second knockout drum, the 3rd knockout drum and the 4th knockout drum, on path between described the second heat exchanger and described the first knockout drum, be connected with the first injector, between described the 3rd knockout drum and described the second heat exchanger, form interface channel, on this interface channel, be provided with the second injector, it is characterized in that: described air inlet divides two-way, one tunnel enters screw expander, another road enters the booster compressor of natural gas liquefaction device, this booster compressor recycle compressor that is connected in parallel, the natural gas that described booster compressor is in parallel with recycle compressor after converging enters precooling heat interchanger.
Screw expander drives generator to generate electricity and realizes again the dual-use function of natural gas liquefaction (LNG) simultaneously, thereby the present invention has significant economical and technical benefit.
For the level of purification of natural gas reaches the requirement of liquefaction, described air inlet is by filter, the de-benzene device of dehydration, de-CO
2after device, enter described booster compressor.
In order to make full use of cold, produce to greatest extent liquefied natural gas, described screw expander is provided with user's output interface and refrigerant output interface, and this refrigerant output interface is connected with described precooling heat interchanger.
For the natural gas of realizing after the re-heat of described precooling heat interchanger is directly exported to user, described precooling heat interchanger is connected with described the first heat exchanger; This precooling heat interchanger is also provided with second user's output interface.
Between described precooling heat interchanger and described the first heat exchanger, be connected with dust filter unit; Its effect is the high-pressure natural gas of clean import.
Liquefy in order to enter high-pressure injection natural gas, described the first heat exchanger connects described refrigeration machine, described the second heat exchanger successively; This second heat exchanger outlet be connected in parallel described the first injector and described the second injector; Described the first injector connects described the first knockout drum, and this first knockout drum is connected with described the second heat exchanger, the 3rd knockout drum.
In order to make full use of cold, produce to greatest extent liquefied natural gas, described the first knockout drum top arranges a pipeline and connects the subcooler in described the 3rd knockout drum, and is connected with described the second knockout drum.
Described the second injector is connected with described the 4th knockout drum; The 4th knockout drum is connected with LNG storage tank; Described the second injector is also connected with described the 3rd knockout drum.
In order to control and to regulate described screw expander pressure recovery energy, this screw expander front end is provided with rotating speed control valve, and is connected with generator.
The present invention compared with prior art, its advantage is: one, there is natural gas liquefaction and the dual-use function that utilizes pressure energy of natural gas generating, be that the present invention makes full use of the lower natural gas of temperature after expansion power generation, as the precooling source of the gas of natural gas liquefaction device, screw expander drives generator generating to realize the dual-use function of natural gas liquefaction (LNG) by high pressure supersonic injectors again simultaneously, thereby economical and technical benefit is better; Its two, meanwhile, the natural gas temperature after expanding by screw expander is again lower, as the precooling source of the gas of natural gas liquefaction device, form generating, liquefaction complexes combined cycle process, the comprehensive utilization to pressure energy of natural gas effectively; Its three, this liquefied natural gas (LNG) can also be used for the peak regulation of gas distributing system, guarantees natural gas stable supplying, when fully meeting consumers' demand, has reached again energy-conservation and environmental protection object.
Brief description of the drawings
Fig. 1 is system diagram of the present invention;
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
Fig. 1 illustrates the embodiment of the present invention as an example of the comprehensive utilization of natural valve station pressure energy example, and it comprises the air inlet 33 from this natural valve station, and its pressure is P
1=4.1MPa, flow are 50000Nm
3/ h, temperature are 25 DEG C; The high-pressure natural gas of this air inlet divides two-way; The first via 31 enters the TRT of screw expander, and the second tunnel 32 enters high pressure supersonic injectors natural gas liquefaction device;
The first via 31: enter screw expander (flow 45000Nm by rotating speed control valve 3 from natural valve station
3/ h, accounts for 90%) acting of expanding;
Screw expander 2 drives generator 1 to generate electricity; Gas pressure after expansion is down to P
2=2.1MPa, temperature are down to-10 DEG C of left and right; Now can reclaim mechanical energy 450KW.
The second tunnel 32: (flow is 5000Nm to enter liquefying plant from natural valve station
3/ h, accounts for 10%) realize the full liquefaction of natural gas;
The liquefied gas on this second tunnel enters filter 4, the de-benzene device 5 of dehydration, de-CO from natural valve station
2device 6, the purification of this natural gas reaches after the requirement of liquefaction, enter booster compressor 7, the pressure of this natural gas rises to 12MPa, converging with the natural gas that is 12MPa from the pressure of recycle compressor 8, enter precooling heat interchanger 9, and be that 2.1MPa, temperature are carried out heat exchange for-10 DEG C of natural gases with exporting from decompressor 2 pressure coming, temperature drops to 0 DEG C of left and right, then enters dust filter unit 10;
The above-mentioned clean natural gas that there is no impurity, pressure is that 12MPa, temperature are 0 DEG C of left and right, enters high-pressure injection natural gas liquefaction device; First through the first heat exchanger 11 and refrigeration machine 20, finally by cross the second heat exchanger 12 cooling after, temperature reaches-65 DEG C, a point following two-way enters first and second two injectors;
One tunnel enters the first injector 18, in the mixing chamber of this first injector, by expand after pressure be 0.6MPa, temperature be-134 DEG C natural gas some be liquefied;
Due to this first injector ejector action, the prevention of natural gas ejected that is 0.45MPa the pressure coming from the second knockout drum 15 enters the mixing chamber of this first injector, in this mixing chamber, makes its liquefaction;
Diffuser pipe in the first injector 18 rises to 0.65MPa the pressure of natural gas, and now, gas-liquid two-phase natural gas enters the first knockout drum 19 and separates; Gaseous natural gas after separation is as low-temperature receiver, enter the second heat exchanger 12 and First Heat Exchanger 11 from the top of the first knockout drum 19, cooling precooling heat interchanger 9 and dust filter unit 10 natural gas out of passing through again of this gaseous natural gas as low-temperature receiver from booster compressor 7 and recycle compressor 8 converge; Liquified natural gas after separation Pressure Drop after the choke valve throttling of the first knockout drum 19 bottoms, to 0.45MPa, enters the 3rd knockout drum 15;
Above the first knockout drum 19, a pipeline being also set, is that 0.65MPa, temperature are that the natural gas of-134 DEG C is introduced in the subcooler of the 3rd knockout drum 15 and carried out heat exchange pressure, now in pipe, form the natural gas of gas-liquid two-phase, entering the second knockout drum 17 separates again, gaseous natural gas after separation is as low-temperature receiver, enter the second heat exchanger 12, the cooling natural gas that natural gas is 12MPa by precooling heat interchanger 9 and dust filter unit 10 pressure out again that converges from booster compressor 7 and recycle compressor 8 of First Heat Exchanger 11, liquified natural gas after separation after the choke valve throttling of the second knockout drum 17 bottoms Pressure Drop to 0.45MPa, enter the 3rd knockout drum 15. and can make full use of like this cold, produce to greatest extent liquefied natural gas (LNG).
Another road enters the second injector 16, and in the mixing chamber of this second injector 16, after expanding, it is some liquefaction of natural gas of-141 DEG C that pressure is reduced to 0.4MPa, temperature; Owing to spraying ejector action, the natural gas that is 0.25MPa the pressure coming from the 4th knockout drum 14 and LNG storage tank 13 sucks the second injector mixing chamber; In this mixing chamber, make its liquefaction; Diffuser pipe in the second injector 16 rises to 0.45MPa the pressure of natural gas, and gas-liquid two-phase natural gas enters in the 3rd knockout drum 15, carries out gas-liquid separation.Liquid is after the choke valve throttling of the 3rd knockout drum 15 bottoms, and Pressure Drop, to 0.25MPa, enters the 4th knockout drum 14, then enters LNG storage tank 13.
In the 4th knockout drum 14 and LNG storage tank 13, the gas pressure of gasification is that 0.25MPa, temperature are-149 DEG C, make its liquefaction because the ejector action of the second injector 16 is inhaled in the mixing chamber of the second injector 16, so just realized the full liquefaction of natural gas.
After natural gas of the present invention is compressed by compressor, through from the lower heat exchange gas of the next temperature of decompressor, enter dust filter unit 10, again enter the first heat exchanger 11, refrigeration machine 20 and the second heat exchanger 12 cooling after, temperature reaches-65 DEG C, then divides two-way to enter respectively the first injector 18 and the second injector 16; Be the injection of 12MPa～8MPa natural gas injector at mixing chamber by pressure, produce low temperature and make natural gas liquefaction; Simultaneously can also injection, the mixing chamber that the natural gas in the lower knockout drum of pressure enters injector makes its liquefaction; Then after raising pressure 0.05MPa～0.1MPa, the diffuser of injector enters knockout drum; Isolated liquefied natural gas (LNG) enters LNG storage tank 13, isolated cryogenic natural gas from knockout drum jacking enter the second heat exchanger 12 and the first heat exchanger 11 as low-temperature receiver cooling from booster compressor 7 natural gas that natural gas is 12MPa by precooling heat interchanger 9 and dust filter unit 10 pressure out again that converges with recycle compressor 8; This part natural gas after re-heat enters recycle compressor, after pressure is risen to and converged with the natural gas of booster compressor after 12MPa～8MPa, enters together precooling heat interchanger, starts again new one and takes turns steam ejection liquefaction circulation.
DEG C left and right, natural gas-10 after the present invention is expanded by screw expander, as refrigerant precooling methane, make the methane of its pressure 12MPa, 0 DEG C of left and right of temperature enter the first heat exchanger and refrigeration machine, finally by crossing after the second cools down, temperature reaches-65 DEG C and enters injector.One time liquefied fraction can reach more than 35%, and the pressure of methane that enters ice chest only needs 12MPa.
The present invention utilizes pressure energy in natural gas storage and transport process, adopt screw expander to drive generator generating, and the energy of temperature gap in natural gas storage and transport process, with the natural gas liquefaction device of high pressure supersonic injectors, produce liquefied natural gas (LNG).
The present invention is applicable to the gas well of natural gas, and---mother station---substation----Men energy of pressure and temperature gap in each link storage and transport process of standing is realized generating and natural gas liquefaction, and the amount of natural gas of its output of process remains unchanged substantially; Thereby there is more significant economic benefit.
For example, flow is 50000Nm
3/ h, pressure are the electricity that the natural gas of 4MPa (G) can send 500KWh, can also produce 80 tons of left and right of liquefied natural gas (LNG) every day.
If China's natural gas output in 2012 is 1077 billion cubic meters, if wherein have 70% to enter gas trunklines pipe network, entering tolerance is 753.9 billion cubic meters; Above-mentioned entering in tolerance 753.9 billion cubic meters, if with the present invention's 6.6 hundred million degree electricity that can generate electricity, can also produce 5,020,000 tons of liquefied natural gas (LNG).
Claims (10)
1. pressure energy of natural gas comprehensive utilization complexes, comprise inlet, delivery outlet, the first heat exchanger, the precooling unit of the second heat exchanger and refrigeration machine and the first knockout drum, the second knockout drum, the 3rd knockout drum and the 4th knockout drum, on path between described the second heat exchanger and described the first knockout drum, be connected with the first injector, between described the 3rd knockout drum and described the second heat exchanger, form interface channel, on this interface channel, be provided with the second injector, it is characterized in that: described air inlet (33) point two-way, one tunnel enters screw expander (2), another road enters the booster compressor (7) of natural gas liquefaction device, this booster compressor recycle compressor (8) that is connected in parallel, described supercharger (7) enters precooling heat interchanger (9) with the natural gas after in parallel converging of recycle compressor (8).
2. pressure energy of natural gas fully utilizes complexes according to claim 1, it is characterized in that: described air inlet (33) is by filter (4), the de-benzene device (5) of dehydration, de-CO
2after device (6), enter described booster compressor (7).
3. pressure energy of natural gas fully utilizes complexes according to claim 1, it is characterized in that: described screw expander (2) is provided with user's output interface (34) and refrigerant output interface (35), and this refrigerant output interface (35) is connected with described precooling heat interchanger (9).
4. pressure energy of natural gas fully utilizes complexes according to claim 3, it is characterized in that: described precooling heat interchanger (9) is connected with described the first heat exchanger (11); This precooling heat interchanger is also provided with second user's output interface (36).
5. pressure energy of natural gas fully utilizes complexes according to claim 4, it is characterized in that: between described precooling heat interchanger (9) and described the first heat exchanger (11), be connected with dust filter unit (10).
6. pressure energy of natural gas fully utilizes complexes according to claim 5, it is characterized in that: described the first heat exchanger (11) connects described refrigeration machine (20), described the second heat exchanger (12) successively; The outlet of this second heat exchanger (12) be connected in parallel described the first injector (18) and described the second injector (16).
7. pressure energy of natural gas fully utilizes complexes according to claim 6, it is characterized in that: described the first injector (18) connects described the first knockout drum (19), this first knockout drum is connected with described the second heat exchanger (12), the 3rd knockout drum (15).
8. pressure energy of natural gas fully utilizes complexes according to claim 7, it is characterized in that: described the first knockout drum (19) top arranges a pipeline and connects the subcooler in described the 3rd knockout drum (15), and is connected with described the second knockout drum (17).
9. pressure energy of natural gas fully utilizes complexes according to claim 6, it is characterized in that: described the second injector (16) is connected with described the 4th knockout drum (14); The 4th knockout drum is connected with LNG storage tank (13); Described the second injector (16) is also connected with described the 3rd knockout drum (15).
10. pressure energy of natural gas fully utilizes complexes according to claim 1, it is characterized in that: described screw expander (2) front end is provided with rotating speed control valve (3), and is connected with generator (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410207334.6A CN103983084A (en) | 2014-05-03 | 2014-05-03 | Natural gas pressure energy comprehensive utilization complete equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410207334.6A CN103983084A (en) | 2014-05-03 | 2014-05-03 | Natural gas pressure energy comprehensive utilization complete equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103983084A true CN103983084A (en) | 2014-08-13 |
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Cited By (2)
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| CN107990630A (en) * | 2017-11-17 | 2018-05-04 | 国鸿液化气机械工程（大连）有限公司 | Natural gas liquefaction system, the method for reducing compressor power consumption and the application in re-liquefied |
| CN112577261A (en) * | 2020-12-21 | 2021-03-30 | 襄阳航力机电技术发展有限公司 | Novel natural gas pressure reduction power generation system and extraction method of liquefied natural gas |
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Application publication date: 20140813 |