CN102268309B - Full liquefaction process for natural gas by using supersonic speed cyclone separator - Google Patents
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Abstract
The invention relates to a full liquefaction process for natural gas by using a supersonic speed cyclone separator. The process comprises the following steps of: inputting purified raw material natural gas into a pre-cooling heat exchanger to pre-cool; inputting pre-cooled natural gas into the supersonic speed cyclone separator to expand, partially liquefy and separate; separating to obtain liquefied natural gas output; reflowing gas-state natural gas to the pre-cooling heat exchanger to recover cold; and finally mixing the gas-state natural gas with the purified raw material natural gas, wherein when the pressure of the raw material natural gas is 3-6MPa, the reflowed gas-state natural gas is compressed and air-cooled, is then mixed with the purified raw material natural gas and is fed into the pre-cooling heat exchanger to be pre-cooled; and when the pressure of the raw material natural gas is 400-1,200kPa, the reflowed gas-state natural gas is firstly mixed with the purified raw material natural gas, is then compressed and air-cooled and is fed into the pre-cooling heat exchanger to be pre-cooled. Through the process provided by the invention, full liquefaction of the natural gas can be realized; and the process has the advantages of simple flow, less equipment and the like.
Description
Technical field
The present invention relates to a kind of full liquefaction process and equipment thereof of Sweet natural gas, relate in particular to a kind of Full liquefaction process for natural gas and equipment thereof that adopts supersonic cyclone separator, belong to the liquefaction Technology of Natural Gas field.
Background technology
Sweet natural gas is a kind of fossil energy of high-quality cleaning, and after the natural gas via liquefaction, it is original 1/625 that its volume is about, thereby be convenient to store and transportation.Compare with pipeline gas, natural gas liquids (LNG) has irreplaceable effect aspect the introduction of the development and use of the utilization of the exploitation in scattered gas field, marginal gas field, coal-seam gas, offshore natural gas and overseas Sweet natural gas.Although China's Large gas field is less, small-sized scattered a lot of with the gas field edge, the cost of long distance pipeline can't be born in these small-sized gas fields and marginal gas field.Natural gas liquids can effectively be developed the resource in scattered gas field and marginal gas field because having little, the flexible advantage of investment.Coal-seam gas, popular name gas is the serious problems that perplex for a long time Safety of Coal Mine Production.Adopt the utilization of the method realization coal-seam gas of liquefaction, not only can solve the coal mine production safety problem, can also improve energy structure, reduce and pollute, and obtain good economic benefit.In addition, liquefaction Technology of Natural Gas at the peak regulation of Sweet natural gas, utilize the storage of floating lng production to unload in the introduction of platform (be LNG FPSO, be also referred to as FLNG) exploitation offshore natural gas resource and overseas Sweet natural gas also to play an important role.
Liquefaction Technology of Natural Gas is the first ring of whole LNG industrial chain, also is a very important ring.Conventional natural gas liquefaction process can be divided three classes: compact cascade type refrigeration techniques, expander refrigeration technique and mix refrigerant circulation technology (MRC).The compact cascade type refrigeration techniques is because unit is many, and flow process is complicated, and facility investment is high, attended operation is inconvenient thereby seldom employing behind the seventies.Conventional natural gas liquefaction process mainly contains MRC and expander cycle two classes.Although wherein MRC technique energy utilization efficiency is very high, general device is more, will repeatedly carry out gas-liquid separation thereby flow process complexity in circulation, and needs the proportioning of control azeotrope.And the employing expander refrigeration, although flow process is simple and technique is less, the band liquid of decompressor expands larger difficulty is arranged technically, and its refrigerating efficiency is generally lower slightly than MRC technique.Above-mentioned two kinds of techniques have adopted respectively J-T valve and decompressor as cooling module, all are conventional refrigeration modes.Supersonic cyclone separator is a kind of novel cooling module, but usually is difficult to the temperature that direct expansion obtains making natural gas liquefaction, and gas products that can only the partial liquefaction entrance.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of Full liquefaction process for natural gas, adopt supersonic cyclone separator to replace throttling valve and decompressor etc. as refrigeration part, realized whole liquefaction of Sweet natural gas.
The present invention also aims to provide a kind of Sweet natural gas full liquefaction device.
For achieving the above object, the present invention at first provides a kind of Full liquefaction process for natural gas, and it may further comprise the steps:
To carry out precooling treatment through the raw natural gas input precool heat exchanger device of purifying treatment;
With the Sweet natural gas after precooling treatment input supersonic cyclone separator expand, partial liquefaction and separating, the natural gas liquids that obtains after the separation (LNG) output, gaseous natural gas is back to the precool heat exchanger device and reclaims cold, and then the raw natural gas with the process purifying treatment mixes;
Wherein, when raw natural gas pressure was 3-6MPa, the gaseous natural gas of backflow carries out first processed compressed and air cooling to be processed, and then mixed with the raw natural gas of process purifying treatment, entered the precool heat exchanger device and carried out precooling treatment;
When raw natural gas pressure is 400-1200kPa (being preferably 400-800kPa), the gaseous natural gas that refluxes mixes with the raw natural gas of process purifying treatment first, then after carrying out the processing of processed compressed and air cooling, enter the precool heat exchanger device and carry out precooling treatment.
Full liquefaction process for natural gas provided by the present invention is an integral body, in technological process, has separated having the portion gas Sweet natural gas after the natural gas liquids and reflux and mix with the raw natural gas of new input, and this is the process of a circulation.The full liquefaction of mentioning among the present invention is for whole technique, because the existence that Sweet natural gas refluxes, the Sweet natural gas that is liquefied in supersonic cyclone separator not necessarily is exactly the raw natural gas of all newly inputting, but, from measuring, the raw natural gas of new input is identical with the rear natural gas liquids that obtains of liquefaction, and the amount of the natural gas liquids that namely obtains after the liquefaction is identical with the amount of the raw natural gas of input, and this raw natural gas that just is equivalent to input all has been liquefied.
In Full liquefaction process for natural gas provided by the invention, preferably provide cold by single loop single-stage compression mix refrigerant circulation device for the precooling treatment in the precool heat exchanger device, in the precool heat exchanger device with the Sweet natural gas (raw natural gas after the purification, the mixture of the raw natural gas after perhaps purifying and the gaseous natural gas of backflow) is chilled in advance certain temperature, and then be transported in the supersonic cyclone separator and realize expanding, partial liquefaction with separate, middle portion at supersonic cyclone separator can obtain the natural gas liquids that pressure is about 400-800kPa, its flow with purify after the flow of Sweet natural gas identical, thereby realized whole liquefaction of raw natural gas.
The Sweet natural gas that is not liquefied in supersonic cyclone separator can leave through its pneumatic outlet, and return the precool heat exchanger device and reclaim cold, then further compression improves pressure and cooling, according to the height of raw natural gas pressure determine before improving pressure or after cooling with purify after raw natural gas mixes, thereby realization circulates.
In Full liquefaction process for natural gas provided by the invention, the mix refrigerant that adopts in the single loop single-stage compression mix refrigerant circulation device can be comprised of methane, carbon two, carbon three and carbon five etc., and its component is suitable for providing extremely-60 ℃ cold of normal temperature.According to concrete technical scheme of the present invention, preferably, above-mentioned mix refrigerant has following molar percentage and forms: methane, 10-15%, ethene, 18-25%, propane, 35-45%, iso-pentane, 22-28%; All form sum is 100%; More preferably, above-mentioned mix refrigerant has following molar percentage composition: methane, 12.29%, ethene, 21.5%, propane, 40.95%, iso-pentane, 25.26%.In above-mentioned single loop single-stage compression mix refrigerant circulation device, can adopt following Recycle design: mix refrigerant at first enters the cryogen compressor and carries out single-stage compression to improve pressure, be chilled in advance-55 ℃ to-65 ℃ by entering the precool heat exchanger device after the air cooler cooling again, then through an expansion valve throttling cooling, low-temperature low-pressure refrigerant after the throttling enters and returns the cryogen compressor after the precool heat exchanger device provides cold, thereby realizes the pre-cooling cycle of mix refrigerant.
In Full liquefaction process for natural gas provided by the invention, the compression ratio of the mix refrigerant in the single loop single-stage compression mix refrigerant circulation device may be controlled to 4.5-7, is preferably 5.2-5.8.Only need to adopt single-stage compression to get final product for the compression of mix refrigerant, not need intercooling, in the working cycle of mix refrigerant also without any need for gas-liquid separation.
In Full liquefaction process for natural gas provided by the invention, preferably, the temperature of precooling may be controlled to-50 ℃ to-80 ℃ (being preferably-55 ℃ to-80 ℃, more preferably-55 ℃ to-65 ℃).Will enter the Sweet natural gas precooling of supersonic cyclone separator to above-mentioned temperature, can make supersonic cyclone separator in high efficiency region work, obtain liquefied fraction (be the liquefied fraction in exit herein, it is defined as the molar flow of the liquid that obtains from supersonic cyclone separator outlet and the ratio of the total molar flow of separator inlet gas) and be the LNG product of 0.15-0.25.In supersonic cyclone separator, realized after the gas-liquid separation, natural gas is by carrying out pump around circuit after the diffuser-deceleration supercharging, wherein, the gaseous tension in the exit of supersonic cyclone separator may be controlled to the 1/5-1/2 of ingress gaseous tension, is preferably 1/4-1/3.
The gaseous natural gas that refluxes is after reclaiming cold, mix with the raw natural gas after purifying, wherein: when raw natural gas pressure is 3-6MPa, the gaseous natural gas that refluxes carries out first processed compressed and air cooling to be processed, and then with mix through the raw natural gas of purifying treatment, enter the precool heat exchanger device and carry out precooling treatment; When raw natural gas pressure was 400-800kPa, the gaseous natural gas of backflow mixed with the raw natural gas of process purifying treatment first, then after carrying out the processing of processed compressed and air cooling, enters the precool heat exchanger device and carries out precooling treatment.Through after the precooling treatment, gas enters supersonic cyclone separator and carries out next time processing.In said process, mixed gas flow is about 5-7 times of the raw natural gas flow after the purification.According to concrete technical scheme of the present invention, in above-mentioned treating processes, the compression ratio of processed compressed may be controlled to 2-5, and (when adopting the decomposite processing of first compression cooling, this compression ratio refers to the compression ratio of backflow Sweet natural gas; When adopting the processing that mixes first the recompression cooling, this compression ratio refers to the backflow Sweet natural gas mixes the compression of carrying out afterwards with raw natural gas compression ratio).This compression ratio is lower, therefore, only needs single-stage compression just passable, does not need intercooling, is conducive to simple flow.
The present invention also provides a kind of natural gas liquefaction device for above-mentioned Full liquefaction process for natural gas, and it comprises liquefaction system and chilldown system, wherein,
Liquefaction system comprises one first compressor, one first air cooler, the precool heat exchanger device, supersonic cyclone separator and natural-gas transfer pipeline, be provided with first flow in the precool heat exchanger device, the second runner, the 3rd runner and the 4th runner, supersonic cyclone separator has an entrance, one pneumatic outlet and a liquid exit, and, the first compressor, the first air cooler, the 4th runner of precool heat exchanger device, the entrance of supersonic cyclone separator, the pneumatic outlet of supersonic cyclone separator, the 3rd runner of precool heat exchanger device interconnects and forms the Sweet natural gas loop by pipeline;
The 3rd runner of natural-gas transfer pipeline and precool heat exchanger device and the pipeline communication between the first compressor, be applicable to the lower situation of raw natural gas pressure, perhaps, pipeline communication between the 4th runner of natural-gas transfer pipeline and the first air cooler and precool heat exchanger device is applicable to the higher situation of raw natural gas pressure;
Chilldown system is a single loop single-stage compression mix refrigerant recycle system, it comprises one second compressor, one second air cooler and a J-T valve, and the second runner of the first flow of the second compressor, the second air cooler, precool heat exchanger device, J-T valve and precool heat exchanger device interconnects and forms refrigerant loop by pipeline.
Natural gas liquefaction process provided by the present invention and equipment adopt supersonic cyclone separator to replace throttling valve and decompressor as refrigeration part, by the pre-cold-peace exit gas backflow of inlet gas recompression, in the situation of the maintenance energy consumption level suitable with MRC technique, realize whole liquefaction of Sweet natural gas, and had the advantages such as flow process is simple, equipment is few.Compression process at gas does not need intercooling and gas-liquid separation, does not need the cryogen storage tank yet, has avoided the storage of a large amount of liquid refrigerants, unloads in the platform particularly applicable in the storage of small-scaled natural gas liquification device especially floating lng production.
Description of drawings
The following drawings only is intended to the present invention done and schematically illustrates and explain, not delimit the scope of the invention.Wherein:
The structural representation of the natural gas liquefaction device that Fig. 1 provides for embodiment 1;
The structural representation of the natural gas liquefaction device that Fig. 2 provides for embodiment 3.
The drawing reference numeral explanation:
The first compressor 1 first air cooler 2 precool heat exchanger devices 3 supersonic cyclone separators 4 natural-gas transfer pipelines 5 second compressors 6 second air coolers 7 J-T valves 8 entrances 401 pneumatic outlets 402 liquid exits 403
Embodiment
Understand for technical characterictic of the present invention, purpose and beneficial effect being had more clearly, referring now to Figure of description technical scheme of the present invention is carried out following detailed description, but but can not be interpreted as restriction to practical range of the present invention.
Embodiment 1
Present embodiment provides a kind of natural gas liquefaction device, and as shown in Figure 1, this natural gas liquefaction device comprises a liquefaction system and a chilldown system, wherein,
Liquefaction system comprises one first compressor 1, one first air cooler 2, precool heat exchanger device 3, supersonic cyclone separator 4 and natural-gas transfer pipeline 5;
In the precool heat exchanger device 3 from top to bottom four runners arranged side by side be respectively first flow, the second runner, the 3rd runner and the 4th runner;
Supersonic cyclone separator 4 has an entrance 401, a pneumatic outlet 402 and a liquid exit 403;
The 4th runner of the first compressor 1, the first air cooler 2, precool heat exchanger device 3, the entrance 401 of supersonic cyclone separator 4, the pneumatic outlet 402 of supersonic cyclone separator 4, the 3rd runner of precool heat exchanger device 3 interconnect by pipeline, form the Sweet natural gas loop;
Natural-gas transfer pipeline 5 is for delivery of the raw natural gas through purifying, itself and the 3rd runner of precool heat exchanger device 3 and the pipeline communication between the first compressor 1;
Chilldown system is a single loop single-stage compression mix refrigerant recycle system, comprises one second compressor 6, the second air cooler 7 and a J-T valve 8;
The second runner of first flow, J-T valve 8 and the precool heat exchanger device 3 of the second compressor 6, the second air cooler 7, precool heat exchanger device 3 interconnects by pipeline, forms the refrigerator loop.
Embodiment 2
Present embodiment provides a kind of Full liquefaction process for natural gas, and it is that the full liquefaction device that adopts embodiment 1 to provide realizes that the higher situation of raw natural gas pressure after being applicable to purify when for example raw natural gas pressure is 3-6MPa, specifically may further comprise the steps:
By the raw natural gas of natural-gas transfer pipeline 5 inputs through purifying;
Make the raw natural gas after the purification mix (pressure-controlling is 3-6MPa, and temperature is controlled to be 30-45 ℃) with Sweet natural gas through overdraft and cooled backflow, obtain mixed gas;
Make mixed gas at first in the 4th runner of precool heat exchanger device 3 as hot-fluid by precooling, generally be pre-chilled to-50 to-80 ℃ (being preferably-55 to-65 ℃), then make the mixed gas after the precooling enter supersonic cyclone separator 4 by entrance 401, in the De Laval noz(zle) of supersonic cyclone separator 4, be expanded to supersonic speed, pressure is reduced to 600-1000kPa, temperature reduces and makes a part of gas be condensed into liquid, liquid is separated from the gas in the cyclonic separation section, the centre may have a small amount of liquid and again gasify, separating the liquid that obtains exports by liquid exit 403, be the LNG product, this partial liquefaction gas accounts for the ratio (mol ratio) between 10-25% of mixed gas, be that liquefied fraction is 0.1-0.25, and its flow with purify after gas discharge equate, the LNG product that obtains adopts the mode of storage with pressure to store, and realizes whole liquefaction of Sweet natural gas;
The gas that does not liquefy in supersonic cyclone separator 4 is through diffusor, Speed Reduction and pressure raise, and leave from the pneumatic outlet 402 of supersonic cyclone separator 4, its temperature still is lower than envrionment temperature, generally between-60 to-80 ℃, and pressure is about the 1/2-1/5 of entrance mixed gas, this part gas is at first got back in the 3rd runner of precool heat exchanger device 3 as cold fluid and is reclaimed cold, out utilize afterwards the first compressor 1 that it is compressed to the pressure of the ingress mixed gas of supersonic cyclone separator 3 from precool heat exchanger device 3, recycling the first air cooler 2 is cooled to it near envrionment temperature, then with purify after Sweet natural gas mix (this moment, two portions gaseous tension was identical), finish open cycle;
In order to realize the precooling of mixed gas in precool heat exchanger device 3, adopt the single compression of simple single-stage MRC circulation that cold is provided: azeotrope is comprised of methane, ethene, propane and four kinds of components of iso-pentane, and its molar constituent is methane 12.29%, ethene 21.5%, propane 40.95% and iso-pentane 25.26%.In working cycle, azeotrope at first is compressed to 1200-1800kPa (being preferably compressed to 1400-1600kPa) by the second compressor 6, then utilizes the second air cooler 7 to be cooled near envrionment temperature 30 ℃ to 45 ℃; Cooled azeotrope at first is chilled to-40 ℃ to 60 ℃ (being preferably-50 ℃) in advance as the first flow that hot-fluid enters precool heat exchanger device 3, then by 8 throttling expansions of J-T valve to 200-350kPa (being preferably 260-290kPa), and the compression ratio of the second compressor 6 remains about 4.5-7 (being preferably 5.2-5.8); The azeotrope of the low temperature after the throttling is (generally at-55 to-85 ℃, being preferably-70 ℃) the second runner of entering precool heat exchanger device 3 as cold fluid provides cold, out gaseous state cryogen reenters the second compressor 6 from the second road, finishes the mixed once refrigerant circulation and begins new circulation.
Embodiment 3
Present embodiment provides a kind of natural gas liquefaction device, as shown in Figure 2, pipeline communication between the 4th runner of the natural-gas transfer pipeline 5 of this natural gas liquefaction device and the first air cooler 8 and precool heat exchanger device 3, other structures are identical with the natural gas liquefaction device that embodiment 1 provides.
Embodiment 4
Present embodiment provides a kind of Full liquefaction process for natural gas, it is that the full liquefaction device that adopts embodiment 2 to provide is realized, the lower situation of raw natural gas pressure after being applicable to purify when for example raw natural gas pressure is 400-800kPa, specifically may further comprise the steps:
By the raw natural gas of natural-gas transfer pipeline 5 inputs through purifying;
Raw natural gas after the purification at first with from precool heat exchanger device 3 the 3rd runner backflow Sweet natural gas out mixes, and obtains mixed gas;
Then utilize the first compressor 1 that mixed gas is compressed to 3-6MPa, recycle the first air cooler 2 it is cooled near envrionment temperature (temperature is generally 30-45 ℃);
Cooled mixed gas at first enters in the 4th runner of precool heat exchanger device 3, is pre-chilled to-50 to-80 ℃ (being preferably-65 ℃) as hot-fluid;
Mixed gas after the precooling enters supersonic cyclone separator 4 by entrance 401, in the De Laval noz(zle) of supersonic cyclone separator 4, be expanded to supersonic speed, pressure is reduced to 600-1000kPa, temperature reduces and makes a part of gas be condensed into liquid, the gas of liquefaction is separated from the gas in the cyclonic separation section, the centre may have a small amount of liquid and again gasify, separate the liquid that obtains and be the LNG product by liquid exit 403 outputs, this partial liquefaction gas accounts for the ratio of mixed gas between 10-25%, be that liquefied fraction is 0.1-0.25, and its flow with purify after gas discharge equate, the LNG product that obtains adopts the mode of storage with pressure to store, and realizes whole liquefaction of Sweet natural gas;
The gas that does not liquefy in supersonic cyclone separator 4 is through diffusor, Speed Reduction and pressure raise, and leave from the pneumatic outlet 402 of supersonic cyclone separator 4, its temperature still is lower than envrionment temperature, generally between-60 to-80 ℃, and pressure is about the 1/2-1/5 of entrance mixed gas, this part gas is at first got back in the 3rd runner of precool heat exchanger device 3 as cold fluid and is reclaimed cold, out utilize afterwards the first compressor 1 that it is compressed to the pressure of the ingress mixed gas of supersonic cyclone separator 4 from precool heat exchanger device 3, recycling the first air cooler 2 is cooled to it near envrionment temperature, then with purify after Sweet natural gas mix (this moment, two portions gaseous tension was identical), finish open cycle;
In order to realize the precooling of mixed gas in the precool heat exchanger device, adopt the single compression of simple single-stage MRC circulation that cold is provided: azeotrope is comprised of methane, ethene, propane and four kinds of components of iso-pentane, and its molar constituent is methane 12.29%, ethene 21.5%, propane 40.95% and iso-pentane 25.26%.In working cycle, azeotrope at first is compressed to 1200-1800kPa (being preferably compressed to 1400-1600kPa) by the second compressor 6, then utilizes the second air cooler 7 to be cooled near envrionment temperature 30 ℃ to 45 ℃; Cooled azeotrope at first is chilled to-40 ℃ to 60 ℃ (being preferably-50 ℃) in advance as the first flow that hot-fluid enters precool heat exchanger device 3, then by 8 throttling expansions of J-T valve to 200-350kPa (being preferably 260-290kPa), and the compression ratio of the second compressor 6 remains about 4.5-7 (being preferably 5.2-5.8); The azeotrope of the low temperature after the throttling is (generally at-55 to-85 ℃, being preferably-70 ℃) the second runner of entering precool heat exchanger device 3 as cold fluid provides cold, out gaseous state cryogen reenters the second compressor 6 from the second road, finishes the mixed once refrigerant circulation and begins new circulation.
Above embodiment only is used for technical scheme of the present invention is described and unrestricted, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (11)
1. Full liquefaction process for natural gas, it may further comprise the steps:
The raw natural gas input precool heat exchanger device that will be through the pressure of purifying treatment 3-6MPa carries out precooling treatment, with the Sweet natural gas after precooling treatment input supersonic cyclone separator expand, partial liquefaction and separating, the natural gas liquids output that obtains after the separation, gaseous natural gas is back to the precool heat exchanger device and reclaims cold, carrying out processed compressed and air cooling processes again, then the raw natural gas with the process purifying treatment mixes, and enters the precool heat exchanger device and carries out precooling treatment.
2. Full liquefaction process for natural gas, it may further comprise the steps:
To be through the pressure of purifying treatment the raw natural gas of 400-1200kPa carry out processed compressed and air cooling process after input precool heat exchanger device carry out precooling treatment, with the Sweet natural gas after precooling treatment input supersonic cyclone separator expand, partial liquefaction and separating, the natural gas liquids output that obtains after the separation, gaseous natural gas is back to the precool heat exchanger device and reclaims cold, then the raw natural gas with the process purifying treatment mixes, then after carrying out the processing of processed compressed and air cooling, enter the precool heat exchanger device and carry out precooling treatment.
3. Full liquefaction process for natural gas as claimed in claim 1 or 2 wherein, provides cold by single loop single-stage compression mix refrigerant circulation device for the precooling treatment in the described precool heat exchanger device.
4. Full liquefaction process for natural gas as claimed in claim 3, wherein, described mix refrigerant has following molar percentage and forms:
Methane, 10-15%, ethene, 18-25%, propane, 35-45%, iso-pentane, 22-28%, all form sum is 100%.
5. Full liquefaction process for natural gas as claimed in claim 4, wherein, described mix refrigerant has following molar percentage and forms:
Methane, 12.29%, ethene, 21.5%, propane, 40.95%, iso-pentane, 25.26%.
6. Full liquefaction process for natural gas as claimed in claim 3, wherein, the compression ratio of controlling the mix refrigerant in the described single loop single-stage compression mix refrigerant circulation device is 4.5-7.
7. Full liquefaction process for natural gas as claimed in claim 1 or 2, wherein, the temperature of controlling described precooling is-50 ℃ to-80 ℃.
8. Full liquefaction process for natural gas as claimed in claim 3, wherein, the temperature of controlling described precooling is-50 ℃ to-80 ℃.
9. Full liquefaction process for natural gas as claimed in claim 1 or 2, wherein, the compression ratio of controlling described processed compressed is 2-5.
10. Full liquefaction process for natural gas as claimed in claim 1 or 2, wherein, the gas outlet pressure of described supersonic cyclone separator is controlled to be the 1/5-1/2 of inlet pressure.
11. a natural gas liquefaction device that is used for each described Full liquefaction process for natural gas of claim 1-10, it comprises liquefaction system and chilldown system, wherein,
Described liquefaction system comprises one first compressor, one first air cooler, the precool heat exchanger device, supersonic cyclone separator and natural-gas transfer pipeline, be provided with first flow in the described precool heat exchanger device, the second runner, the 3rd runner and the 4th runner, described supersonic cyclone separator has an entrance, one pneumatic outlet and a liquid exit, and, described the first compressor, the first air cooler, the 4th runner of precool heat exchanger device, the entrance of supersonic cyclone separator, the pneumatic outlet of supersonic cyclone separator, the 3rd runner of precool heat exchanger device interconnects and forms the Sweet natural gas loop by pipeline;
Pipeline communication between the 3rd runner of described natural-gas transfer pipeline and described precool heat exchanger device and described the first compressor, perhaps, the pipeline communication between the 4th runner of described natural-gas transfer pipeline and described the first air cooler and described precool heat exchanger device;
Described chilldown system is a single loop single-stage compression mix refrigerant recycle system, it comprises one second compressor, one second air cooler and a J-T valve, and the second runner of the first flow of described the second compressor, the second air cooler, precool heat exchanger device, J-T valve and precool heat exchanger device interconnects and forms refrigerant loop by pipeline.
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| CN101745246B (en) * | 2009-10-30 | 2014-11-19 | 文闯 | Ultrasonic gas cyclone condensing and separating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107560317A (en) * | 2016-06-30 | 2018-01-09 | 通用电气公司 | System and method for producing liquefied natural gas |
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