CN202139209U - Direct expansion type natural gas liquefaction device - Google Patents
Direct expansion type natural gas liquefaction device Download PDFInfo
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- CN202139209U CN202139209U CN201120119657U CN201120119657U CN202139209U CN 202139209 U CN202139209 U CN 202139209U CN 201120119657 U CN201120119657 U CN 201120119657U CN 201120119657 U CN201120119657 U CN 201120119657U CN 202139209 U CN202139209 U CN 202139209U
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- 239000003345 natural gas Substances 0.000 title claims abstract description 145
- 239000007789 gas Substances 0.000 claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 238000003860 storage Methods 0.000 claims abstract description 17
- 238000007906 compression Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 235000009508 confectionery Nutrition 0.000 claims description 70
- 239000012530 fluid Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000003750 conditioning Effects 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 18
- 239000003949 liquefied natural gas Substances 0.000 abstract description 13
- 238000005057 refrigeration Methods 0.000 abstract description 11
- 230000000875 corresponding Effects 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 10
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- 241000196324 Embryophyta Species 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 5
- 230000002522 swelling Effects 0.000 description 5
- 239000003921 oil Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 235000010599 Verbascum thapsus Nutrition 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N AI2O3 Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 241000893018 Armeria Species 0.000 description 1
- 210000002832 Shoulder Anatomy 0.000 description 1
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- 230000001808 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 230000002950 deficient Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000003009 desulfurizing Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
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- 239000002808 molecular sieve Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
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Abstract
The utility model relates to a direct expansion type natural gas liquefaction device, which belongs to the fields of energy saving and environmental protection. The liquefaction device consists of a purification pretreatment unit, a compression unit, a precooler, an expansion unit, a splitter, a natural gas subcooler, a gas-liquid separator and a liquid natural gas storage tank. Multi-stage compression intermediate cooling is carried out on the natural gas filtrated and purified by the pretreatment unit completes through the compression unit, and high-pressure normal-temperature natural gas is formed. The high-pressure natural gas is precooled by the precooler to realize temperature reduction and then enters the compression unit, two-stage expansion is carried out on the precooled natural gas so that the precooled natural gas can achieve the intermediate pressure, then the natural gas is split into two parts by the splitter, one part of the natural gas enters an expansion machine to be expanded into low-temperature and low-pressure natural gas so as to form low-temperature refrigeration capacity, and the other part of the natural gas after being split is cooled in the subcooler to be in a liquid state under the pressure corresponding to the splitter by utilizing the low-temperature refrigeration capacity so as to realize the liquefaction of the natural gas. The natural gas liquefaction device has the advantages of simple technological process and high safety, is convenient to operate, is easy in modularization disassembling and assembling and can be widely used for the exploitation of unconventional natural gas such as oil field gas, coal-bed gas and the like in the remote scattered gas field.
Description
Technical field
The direct expanding type liquefying plant of a kind of Sweet natural gas belongs to energy-conservation and environmental protection field, mainly utilizes the pressure of Sweet natural gas can realize the liquefaction of Sweet natural gas, reaches energy-conservation, reduces discharging and reclaim the purpose of useful resources.
The utility model background
Sweet natural gas and coal, oil are also claimed three big pillars of present world primary energy source.Heating value of natural gas is high, and environmental pollution is little, is considered to the high-quality clean energy.In recent years, along with the development of world economy, the environmental pollution that the impact of oil crisis and coal, oil are brought is on the rise, and more and more countries begins to pay attention to the utilization of natural gas source in the world.The consumption ratio of Sweet natural gas in primary energy source rises to present 25% from 10% of the beginning of the fifties in last century.The a plurality of iea predictions in the world, 21 century is the epoch of Sweet natural gas.
At present, China is continuing to increase the energy-saving and emission-reduction dynamics, further promotes the market for natural gas development.In recent years, domestic natural gas consumption amount is with average annual 18% speed increase, 2.5% world average level head and shoulders above.But because domestic natural gas source is deficient relatively, the market requirement of utilizing overseas source of the gas to satisfy domestic quick growth becomes inevitable.The expert estimates that inlet natural gas can account for 20%～30% of China's natural gas total quantity consumed in 2010, and to the year two thousand twenty, this ratio is expected to reach 50%.
Sweet natural gas adopts pipe method in big land extensive conveying more, and the mode of natural gas liquids LNGLiquefied Natural Gas is then generally adopted in the international trade of striding ocean and the conveying of big land small-scale Sweet natural gas away from pipe network.Behind the natural gas via low-temperature liquefaction, reduction in bulk is original about 1/600, can significantly reduce accumulating and construction cost like this, and has removed H contained in the gaseous form
2S, CO
2, N
2With numerous impurity such as Hg, thereby be a kind of clean energy that generally acknowledge in the whole world.Countries nowadays is all promoted LNG as a kind of clean fuel of low emission, LNG has become the fastest field of power supply rate of growth, the world today.The production of global LNG and trade in recent years is active day by day, and LNG has become rare cleaning resource, is becoming the new focus of world's oil and gas industry.
According to statistics; Apparent consumption 875 billion cubic meters of Chinese Sweet natural gas in 2009; In the primary energy source structure of consumer demand, account for 3.7%, and the turnout of China's natural gas in 2009 is merely 830 billion cubic meters, the Sweet natural gas insufficiency of supply-demand reaches billion cubic meter more than 40; This insufficiency of supply-demand is replenished by import volume, and Chinese natural gas liquids import volume was added up data from the BP2010 world energy sources is annual up to 76.4 billion cubic meters in 2009.
" 2009 energy blue Book " according to Chinese Academy of Social Sciences's issue estimates that by 2010 and 2015, the China's natural gas consumption was with reaching respectively about 1200 billion cubic meters and 2000 billion cubic meters; China's natural gas insufficiency of supply-demand in 2010 is the 200-300 billion cubic meter, import accounting about 20%; Breach in 2015 is the 300-700 billion cubic meter, and the year two thousand twenty breach will reach the 700-1000 billion cubic meter, and 2015-2020 import accounting is expected to further be extended to 30%-40%.
But; In fact; China but exists natural gas sources such as the Sweet natural gas, coal-seam gas, associated gas, Water Soluble Gas, landfill gas, biogas, torch gas in a large amount of scattered gas fields and outlying gas field, because the amount of having is little, characteristics such as is difficult to transport; But be not used effectively at present, and annual natural gas consumption breach replenishes by Liquefied Natural Gas Import.Develop small-sized sledge-borne type natural gas liquefaction device, make full use of the existing resource of China, not only can alleviate the present energy shortage present situation of China, also can reduce China's natural gas and consume external interdependency, have crucial meaning for energy security.
Because a variety of causes, the development of China's natural gas liquefaction technology aspect also far lags behind world level.Present domestic almost do not have the liquefaction industry of independent intellectual property right and the LNG device of actual motion.And external natural gas liquefaction technology is externally carried out blockade on new techniques, therefore is necessary deep expansion inflammable gas liquefaction technology research.
At present, the liquefaction process of Sweet natural gas mainly contains three types, is respectively stepwise liquefaction process, mix refrigerant refrigeration techniques and expander refrigeration circulation technology.The stepwise liquefaction process is complicated, and equipment is many, safeguards inconvenience.The mix refrigerant refrigeration techniques is the most normal technology that the most often adopts of at present external LNG device; But the accurate proportioning of mix refrigerant is difficulty relatively; And equipment such as compressor are revealed and are made blending ingredients off-design parameter easily; Cause system efficiency to descend, simultaneously, energy consumption is high by about 20% than height ratio stepwise vaporization cycle.The expander refrigeration circulation is used for the less mini gas liquefaction plant of liquefaction amount more; Its system is simple, and volume is little, and is easy to operate; It is strong that feed gas composition is changed flexibility, and shortcoming is that energy consumption is high higher by about 40% than mix refrigerant refrigeration cycle energy consumption like the nitrogen expansion refrigeration.China began the natural gas liquefaction technology is studied in 20 end of the centurys, started late.Order first three liquefaction flow path technology all has operation in the Chinese large-sized natural gas liquefaction plant, like LNG accident peak regulation station, stepwise refrigeration cycle Shanghai, Central Plains LNG factory, gas field, expander refrigeration circulation northern Shensi natural gas liquids demonstration project and mix refrigerant refrigeration techniques Xinjiang lng plant.Small liquid technology for sledge-borne type is main direction of studying with the decompressor liquefaction flow path mainly then.Mix refrigerant circulates in domestic also do not have proven technique and design, operational management experience, and blind controller system is complicated.Therefore, exploitation expanding type mini gas liquefaction system is fit to the present state of the art of China, helps the deviceization of Rapid Realization liquefaction system.
The utility model content
The purpose of the utility model is to propose a kind of mini gas direct expansion formula liquefaction flow path; This flow system utilizes the pressure of Sweet natural gas can realize the liquefaction of Sweet natural gas; The liquefaction of natural gas sources such as the Sweet natural gas in scattered gas field that is present in China in a large number and outlying gas field, coal-seam gas, associated gas, Water Soluble Gas, landfill gas, biogas, torch gas is utilized again; Practiced thrift the energy, reduced present simultaneously because of the air environmental pollution that directly burns or discharging causes.
For achieving the above object, the low temperature that this liquifying method provides a kind of compression-expansion of utilizing HPG to produce is realized the device of natural gas liquefaction, and it contains natural gas conditioning pretreatment unit 1; Compressed element 2; Pre-cooler 3, Sweet natural gas expansion cell 4, splitter 5; Supercooler 6, the storage tank 8 of Sweet natural gas gas-liquid separator 7 and natural gas liquids; It is characterized in that:
Above-mentioned each device all is reserved with the import and export that fluid passes through, and interconnects through pipeline.
Natural gas conditioning pretreatment unit 1 can be removed through moisture, sour gas and other impurity in its gas;
Sweet natural gas compression unit 2, its inlet links to each other with the outlet of natural gas conditioning pretreatment unit 1; Compressed element is by multiple compressors 2-1,2-2, and 2-3 and water cooler 2-4,2-5,2-6 connects to form successively, and every compressor is arranged a water cooler at the back
Sweet natural gas pre-cooler 3 comprises a plurality of fluids import and export, and one of which fluid streams inlet links to each other with compressed element 2 outlets, and the inlet of another fluid streams links to each other with the outlet of supercooler 6;
Sweet natural gas expansion cell 4, its inlet links to each other with the outlet of pre-cooler, by many decompressor 4-1,4-2,4-3 is connected to form successively, and the gas pressure through it is reduced, and temperature reduces;
Splitter 5 comprises 1 inlet and a plurality of outlet, and the outlet of a certain decompressor links to each other in its inlet and the expansion cell 4, and an one of which outlet links to each other with supercooler 6, and another exports then to enter the mouth with next decompressor and links to each other.
Supercooler 6 comprises a plurality of fluids import and export, and one fluidic import links to each other with splitter 5 a certain outlets, and outlet links to each other with gas-liquid separator 7; Another fluid streams inlet links to each other with next above-mentioned decompressor outlet, and its outlet links to each other with the inlet of pre-cooler 3;
Sweet natural gas gas-liquid separator 7 comprises 1 inlet and a plurality of outlet, and separating liquid is from the storage tank 8 of lower part outlet entering natural gas liquids, and the gas of separating is discharged from top exit.
Described natural gas conditioning pretreatment unit 1 adopts absorption method to realize the purification functions such as dehydration, desulfurization and depickling of Sweet natural gas, and sorbent material can be an activated alumina, also can be silica gel, can also be molecular sieve.
Described compressed element is by stage compression, intercooling, or is made up of the mode of single-stage compression postcooling, and used compressor is a radial compressor, or reciprocating compressor, or screw-type compressor, and the compressor pressure ratio is 3～20.
Described decompressor is a turbo-expander, or piston expansion engine, or the screw decompressor, and described decompressor can replace with throttling valve.
Described Sweet natural gas water cooler 2-4,2-5,2-6 are water cooling heat exchanger, or the air cooling interchanger, water cooler can be integrated in compressor inside, or external outside compressor separately.
The driven compressor power of described compressed element 2 is gas engine or phonomoter, compressor can coaxial arrangement by a gas engine or direct motor drive, also can arrange separately, by power wheel drive separately.
Described Sweet natural gas pre-cooler 3 and the reduction of supercooler 6 through interchanger completion natural gas temperature, said interchanger can be bifilar stream interchanger, also can be the multiple flow interchanger, the interchanger form is tube and shell heat exchanger or plate-type heat exchanger.
Described gas-liquid separator 7 has gas-liquid separating function, also can not have gas-liquid separating function.
For pre-cooler 3 and supercooler 6 provide the cryogen of cold, behind released cold quantity, the inlet of the compressed element 2 that can backflow is compressed processing again, also can not backflow directly to get into gas engine, for compressed element provides power.
When treating that natural gas liquids is HPG, described system can not contain compressed element 2, and splitter 5 can be arranged in pre-cooler 3 inlets; The cold fluid that gets into pre-cooler 3 and supercooler 6 can export from the decompressor of expansion cell, also can be from the cryogenic natural gas of gas-liquid separator top exit discharge.
Natural gas liquefaction that the utility model proposed and device, when pending Sweet natural gas was HPG, compressed element can save, and directly to the HPG cooling of expanding, realized the liquefaction of Sweet natural gas.This liquefaction flow path is through parameter regulation, and liquefied rate is 10～100% at present.
Description of drawings
Fig. 1. three grades of zone of swelling of three grades of compressions force down mini gas direct expansion formula liquifying method and the device synoptic diagram that stores;
Fig. 2. three grades of zone of swelling of three grades of compressions force down mini gas direct expansion formula liquifying method and the device synoptic diagram that storage belt backflows;
Fig. 3. three grades of zone of swelling of three grades of compressions are pressed the mini gas direct expansion formula liquifying method and the device synoptic diagram 1 of high-pressure storage;
Fig. 4. three grades of zone of swelling of three grades of compressions are pressed the mini gas direct expansion formula liquifying method and the device synoptic diagram 2 of high-pressure storage;
Fig. 5. three grades of zone of swelling of three grades of compressions force down mini gas direct expansion formula natural gas liquefaction and the device synoptic diagram that stores;
Fig. 6. mini gas direct expansion formula liquifying method that three grades of expansion normal pressure storage belts of three grades of compressions backflow and device synoptic diagram 1;
Fig. 7. mini gas direct expansion formula liquefaction flow path that three grades of expansion normal pressure storage belts of three grades of compressions backflow and device synoptic diagram 2;
Fig. 8. mini gas direct expansion formula liquifying method that HPG double expansion normal pressure storage belt backflows and device synoptic diagram;
Fig. 9. mini gas direct expansion formula liquifying method that HPG double expansion normal pressure storage belt backflows and device synoptic diagram 1;
Figure 10. mini gas direct expansion formula natural gas liquefaction that two stages of compression double expansion normal pressure storage belt backflows and device synoptic diagram 2;
Among the figure, 1, clean unit, 2, compressed element, 3, pre-cooler, 4, expansion cell; 5, splitter, 6, supercooler, 7, gas-liquid separator, 8, the LNG storage tank, 9, gas engine or phonomoter; 10, throttling valve, 2-1,2-2, represents three compressors, 2-4 respectively at 2-3; 2-5, represents three side coolers respectively at 2-6,4-1, and 4-2, represents three decompressors respectively at 4-3
Embodiment
Embodiment 1
As shown in Figure 1, present embodiment is to carry out liquefaction processing to the non-pressurized natural gas liquids of treating, the normal pressure Sweet natural gas is removed impurity and moisture in the Sweet natural gas through after purifying pretreatment unit 1 purifying treatment; After reaching the liquefaction standard, get into compressed element 2, compressed element is by three compressor 2-1; 2-2,2-3, three side cooler 2-4; 2-5,2-6 constitutes, and compressed element compresses Sweet natural gas to 29.4MPa and gets into expansion cell 4; Through two single-screw expander 4-1,4-2 reduces to natural gas temperature-115.6 ℃ earlier, and pressure is reduced to 6 normal atmosphere; Sweet natural gas after dividing cell 5 will expand cooling is divided into two strands then, and one continuation is expanded to normal pressure through screw expander ,-145 ℃; Utilize another strand cryogenic natural gas this low temperature cools off shunting in supercooler 6 after, its temperature is reduced to below the corresponding condensing temperature-133 of 6 normal atmosphere ℃, make its whole liquefaction.The Sweet natural gas Yin Wendu that comes out from supercooler 6 is lower, gets into pre-cooler 3, and the Sweet natural gas after the compression is carried out precooling, makes its precooling after.Sweet natural gas after the liquefaction gets into storage tank 8 and stores as ready.
In the present embodiment; The driving of compressor machine is to utilize gas engine 9 coaxial drive three compressors to realize the compression of Sweet natural gas; Amount of consumed gas is 18kg/h; The liquefied rate of this flow process is 33%, the having a daily output of 1.82t/ days of natural gas liquids, and natural gas liquids is 18.6kwh/kmol than power consumption.
Embodiment 2
As shown in Figure 2, the practical implementation process is with embodiment 1, and different is to backflow from the Sweet natural gas that pre-cooler 3 comes out to get into compressed element 2 inlets, and processed compressed realizes the liquefaction of Sweet natural gas again.
Embodiment 3
As shown in Figure 3; The practical implementation process is with embodiment 1, and the HPG that different is comes out from compressed element gets into dividing cell 5 and is divided into two strands behind one-level expansion 4-1; One continues through double expansion to atmospheric low-temperature; Cool off another strand HPG, its temperature is reduced to below the condensing temperature under the corresponding pressure of one-level expansion back, realize the liquefaction of Sweet natural gas.
Embodiment 4
As shown in Figure 4; The practical implementation process is with embodiment 3, and different is that the HPG pressure that comes out from compressed element is higher, behind one-level expansion 4-1; Obtain the elevated pressures Sweet natural gas; The natural gas liquefaction temperature is higher under this pressure, can not need the Sweet natural gas pre-cooler, can realize the liquefaction of Sweet natural gas equally.
Embodiment 5
As shown in Figure 5; The practical implementation process is with embodiment 1, and different is that compressed element 2 is by two compressor 2-1,2-2 and two side cooler 2-4; 2-5 constitutes the compression that realizes Sweet natural gas; Expansion cell then is by two decompressor 4-1, and 4-2 constitutes, and promptly two stages of compression and double expansion are realized the liquefaction of Sweet natural gas.
Embodiment 6
As shown in Figure 6, the practical implementation process is with embodiment 1, and different is, and natural gas liquids saves as normal pressure stores, and the gas-liquid separation tank top has the Sweet natural gas of not liquefaction to separate, utilize this not natural gas liquids for pre-cooler and supercooler cold is provided.In order to carry out the cold coupling with the Sweet natural gas that backflows, the HPG that comes out from compressed element gets into single-screw expander 4-1,4-2, and before the 4-3, at first through supercooler 3-1,3-2,3-3 cools.Finally make Sweet natural gas reach normal pressure, low-temperature condition, the cooled Sweet natural gas that expands gets into gas-liquid separator 7, and liquify natural gas gets into storage tank 8 storages, as ready, and do not backflow in natural gas via gas-liquid separator 7 tops of liquefaction.
Embodiment 7
As shown in Figure 7, the practical implementation process is with embodiment 6, and different is the Sweet natural gas that backflows from gas-liquid separator 7 tops, and behind pre-cooler 3 released cold quantities, backflowing gets into compressed element inlet, processed compressed again.
Embodiment 8
As shown in Figure 8, pending Sweet natural gas is a HPG, the liquefaction cold of this Sweet natural gas cold that expansion cell 4 expands cold that the back produces and the not natural gas liquids that backflows from gas-liquid separator 7 tops provides of hanging oneself.HPG reaches the standard of liquefaction after cleaner is handled, after splitter 5 is divided into 2 strands, and two decompressor 4-1 of a stock-traders' know-how; 4-2 expansion step-down, cooling, generation cryogenic natural gas are that the liquefaction of second strand of HPG provides cold, the Sweet natural gas after pre-cooler 3 and supercooler 6 are lowered the temperature; Through throttling valve 10; Pressure is reduced to 1 normal atmosphere, and temperature further reduces, and normal pressure, cryogenic natural gas are realized gas-liquid separation in gas-liquid separator 7; Liquify natural gas gets into LNG storage tank 8 and stores as readies, and the gaseous natural gas that does not liquefy in the top then backflows provides cold for Sweet natural gas pre-cooler and supercooler.
Embodiment 9
As shown in Figure 9, practical implementation process and embodiment 8 are similar, and different is that throttling valve 10 usefulness single-screw expanders replace.
Embodiment 10
Shown in figure 10; Practical implementation process and embodiment 8 are similar; Different is from the Sweet natural gas that expansion cell 4 comes out is after pre-cooler 3 provides cold; Be compressed to high pressure through compressed element 2, and carry out liquefaction processing again after HPG after the purifying treatment mixes, this compressed element is the compression that is realized Sweet natural gases by two piston compressors.
Claims (8)
1. direct expanding type liquefying plant of Sweet natural gas, it is characterized in that: it contains natural gas conditioning pretreatment unit (1), compressed element (2); Pre-cooler (3), Sweet natural gas expansion cell (4), splitter (5); Supercooler (6), the storage tank (8) of Sweet natural gas gas-liquid separator (7) and natural gas liquids; It is characterized in that:
Above-mentioned each device all is reserved with the import and export that fluid passes through, and interconnects through pipeline.
Natural gas conditioning pretreatment unit (1) can be removed through moisture, sour gas and other impurity in its gas;
Sweet natural gas compression unit (2), its inlet links to each other with the outlet of natural gas conditioning pretreatment unit (1); Compressed element by multiple compressors (2-1,2-2,2-3) and water cooler (2-4,2-5 2-6) connect to form successively, and every compressor is arranged a water cooler at the back
Sweet natural gas pre-cooler (3) comprises a plurality of fluids import and export, and one of which fluid streams inlet links to each other with compressed element (2) outlet, and the inlet of another fluid streams links to each other with the outlet of supercooler (6);
Sweet natural gas expansion cell (4), its inlet links to each other with the outlet of pre-cooler, and (4-1,4-2 4-3) are connected to form successively, and the gas pressure through it is reduced, and temperature reduces by many decompressors;
Splitter (5) comprises 1 inlet and a plurality of outlet, and the outlet of a certain decompressor links to each other in its inlet and the expansion cell (4), and an one of which outlet links to each other with supercooler (6), and another exports then to enter the mouth with next decompressor and links to each other.
Supercooler (6) comprises a plurality of fluids import and export, and one fluidic import links to each other with a certain outlet of splitter (5), and outlet links to each other with gas-liquid separator (7); Another fluid streams inlet links to each other with next above-mentioned decompressor outlet, and its outlet links to each other with the inlet of pre-cooler (3);
Sweet natural gas gas-liquid separator (7) comprises 1 inlet and a plurality of outlet, and separating liquid is from the storage tank (8) of lower part outlet entering natural gas liquids, and the gas of separating is discharged from top exit.
2. the direct expanding type liquefying plant of a kind of Sweet natural gas according to claim 1; It is characterized in that: described compressed element is by stage compression, intercooling; Or form by the mode of single-stage compression postcooling, used compressor is a radial compressor, or reciprocating compressor; Or screw-type compressor, the compressor pressure ratio is 3～20.
3. the direct expanding type liquefying plant of a kind of Sweet natural gas according to claim 1 is characterized in that: described decompressor is a turbo-expander, or piston expansion engine, or the screw decompressor, and described decompressor can replace with throttling valve.
4. the direct expanding type liquefying plant of a kind of Sweet natural gas according to claim 1 is characterized in that: described Sweet natural gas water cooler (2-4,2-5; 2-6) be water cooling heat exchanger; Or the air cooling interchanger, water cooler can be integrated in compressor inside, or external outside compressor separately.
5. the direct expanding type liquefying plant of a kind of Sweet natural gas according to claim 1; It is characterized in that: the driven compressor power of described compressed element (2) is gas engine or phonomoter; Compressor can coaxial arrangement by a gas engine or direct motor drive; Also can arrange separately, by power wheel drive separately.
6. the direct expanding type liquefying plant of a kind of Sweet natural gas according to claim 1; It is characterized in that: described Sweet natural gas pre-cooler (3) and supercooler (6) are accomplished the reduction of natural gas temperature through interchanger; Said interchanger can be bifilar stream interchanger; Also can be the multiple flow interchanger, the interchanger form is tube and shell heat exchanger or plate-type heat exchanger.
7. the direct expanding type liquefying plant of a kind of Sweet natural gas according to claim 1; It is characterized in that: the cryogen that cold is provided for pre-cooler (3) and supercooler (6); Behind released cold quantity, the inlet of compressed element (2) of can backflowing is compressed processing again; Also can not backflow directly gets into gas engine, for compressed element provides power.
8. the direct expanding type liquefying plant of a kind of Sweet natural gas according to claim 1 is characterized in that: when treating that natural gas liquids is HPG, described system can not contain compressed element (2), and splitter (5) can be arranged in pre-cooler (3) inlet; The cold fluid that gets into pre-cooler (3) and supercooler (6) can export from the decompressor of expansion cell, also can be from the cryogenic natural gas of gas-liquid separator top exit discharge.
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| CN201120119657U CN202139209U (en) | 2011-04-21 | 2011-04-21 | Direct expansion type natural gas liquefaction device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102206520A (en) * | 2011-04-21 | 2011-10-05 | 北京工业大学 | Direct expansion type liquefaction method and device for natural gas |
| CN103017480A (en) * | 2012-12-07 | 2013-04-03 | 中国科学院理化技术研究所 | Liquefaction system for producing LNG (Liquefied Natural Gas) by using pressure energy of pipeline |
| CN103292574A (en) * | 2013-05-02 | 2013-09-11 | 上海交通大学 | Device and method for direct liquification of pipeline gas by utilizing expansion machine |
| CN103398545A (en) * | 2013-07-29 | 2013-11-20 | 中国科学院理化技术研究所 | System for producing liquefied natural gas from raw gas by means of multi-stage pressure throttling |
| CN103968639A (en) * | 2014-05-15 | 2014-08-06 | 南通天源气体有限公司 | Preparing method of liquid gas |
| CN104930815A (en) * | 2015-06-16 | 2015-09-23 | 上海交通大学 | Marine natural gas liquefaction and NGL recycling system and application |
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2011
- 2011-04-21 CN CN201120119657U patent/CN202139209U/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102206520B (en) * | 2011-04-21 | 2013-11-06 | 北京工业大学 | Direct expansion type liquefaction method and device for natural gas |
| CN102206520A (en) * | 2011-04-21 | 2011-10-05 | 北京工业大学 | Direct expansion type liquefaction method and device for natural gas |
| CN103017480B (en) * | 2012-12-07 | 2015-05-06 | 中国科学院理化技术研究所 | Liquefaction system for producing LNG (Liquefied Natural Gas) by using pressure energy of pipeline |
| CN103017480A (en) * | 2012-12-07 | 2013-04-03 | 中国科学院理化技术研究所 | Liquefaction system for producing LNG (Liquefied Natural Gas) by using pressure energy of pipeline |
| CN103292574A (en) * | 2013-05-02 | 2013-09-11 | 上海交通大学 | Device and method for direct liquification of pipeline gas by utilizing expansion machine |
| CN103292574B (en) * | 2013-05-02 | 2016-03-02 | 上海交通大学 | Utilize the device and method of decompressor direct liquefaction pipe natural gas |
| CN103398545A (en) * | 2013-07-29 | 2013-11-20 | 中国科学院理化技术研究所 | System for producing liquefied natural gas from raw gas by means of multi-stage pressure throttling |
| CN103398545B (en) * | 2013-07-29 | 2015-06-10 | 中国科学院理化技术研究所 | System for producing liquefied natural gas from raw gas by means of multi-stage pressure throttling |
| CN103968639A (en) * | 2014-05-15 | 2014-08-06 | 南通天源气体有限公司 | Preparing method of liquid gas |
| CN103968639B (en) * | 2014-05-15 | 2016-05-11 | 南通天源气体有限公司 | A kind of preparation method of liquid gas |
| CN104930815A (en) * | 2015-06-16 | 2015-09-23 | 上海交通大学 | Marine natural gas liquefaction and NGL recycling system and application |
| CN107314234A (en) * | 2017-06-30 | 2017-11-03 | 中海石油气电集团有限责任公司 | A kind of use LNG hydraulic turbines solve the processing system and method for LNG losses |
| CN107314234B (en) * | 2017-06-30 | 2019-04-23 | 中海石油气电集团有限责任公司 | A kind of processing system and method solving LNG loss with LNG hydraulic turbine |
| CN108955085A (en) * | 2017-12-26 | 2018-12-07 | 西安交通大学 | A kind of small-sized skid-mounted type coal gas gasification system and method |
| CN112796982A (en) * | 2021-03-24 | 2021-05-14 | 刘沿霏 | Natural gas compression equipment |
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