CN102492505A - Two-section type single loop mixed refrigerant natural gas liquefaction process and device - Google Patents
Two-section type single loop mixed refrigerant natural gas liquefaction process and device Download PDFInfo
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Abstract
The invention relates to a two-section type single loop mixed refrigerant natural gas liquefaction process and a device. The process comprises the following steps: conducting two-section compression cooling on mixed refrigerant, enabling the mixed refrigerant to be in gas state after first section compression cooling, conducting first gas-liquid separation after second section compression cooling, obtaining gas state refrigerant and liquid state refrigerant; enabling the liquid state refrigerant to enter an ice chest for cooling and then throttling, cooling and returning to the ice chest for providing cooling amount of a high temperature position; enabling the gas state refrigerant to enter the ice chest for cooling to a low temperature and then throttling, cooling and returning to the ice chest for providing cooling amount of a low temperature position; enabling the gas state refrigerant to be converged with the liquid state refrigerant returning to the ice chest after throttling to improve the cooling amount of the high temperature position; conducting two-section type compression cooling on the mixed refrigerant providing the cooling amount to enter next circulation; enabling natural gas to enter the ice chest for cooling, and then obtaining liquefied natural gas products after throttling. The invention further provides a liquefied natural gas device used in the process. The process is simple in process, and has the advantages of high liquefaction rate, low energy consumption and the like.
Description
Technical field
The present invention relates to a kind of natural gas liquefaction process and equipment, relate in particular to a kind of two-part single loop mix refrigerant natural gas liquefaction process and equipment.
Background technology
Sweet natural gas is the clean fossil energy of a kind of high-quality, and after the natural gas via liquefaction, it is original 1/625 that 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 exploitation in scattered gas field, marginal gas field, the utilization of coal-seam gas, marine Sweet natural gas and overseas Sweet natural gas.
Natural gas liquefaction has compact cascade type refrigeration cycle, mix refrigerant refrigeration cycle and expander refrigeration to circulate three kinds.Wherein mix refrigerant circulation (MRC) flow process is simple relatively, and energy utilization efficiency is high, energy consumption is low, thereby adopts the most general.Especially single loop mix refrigerant liquefaction process (SMR) is used in middle-size and small-size liquefying plant very extensively.But single loop mix refrigerant liquefaction process contains more heavy constituent usually in order to keep higher liquefaction efficiency in its cryogen, thereby when segmentation compression intercooling, has the partially liq cryogen and condense.In order to handle this a part of cryogen, the method that adds cryogenic fluid pump can be adopted, but moving parts can be increased, make technical process become complicated.
BV PRICO technology is a kind of existing liquefaction process; This technology is to adopt two sections compression coolings; Cryogen is a gas-liquid two-phase behind the intercooling; Wherein, vapor phase refrigerant gets into two sections suctions port of compressor, and liquid phase refrigerant then promotes its pressure through a special cryogenic fluid pump that is provided with and mixes again with the cryogen of two sections compressor outlets.Because cooled gas-liquid two-phase cryogen needs to handle respectively between this process section, liquid phase refrigerant needs cryogenic fluid pump to carry its technical process more complicated.
One Chinese patent application 201010252812.7 discloses a kind of method of utilizing the mix refrigerant natural gas liquids, and Chinese utility model patent 200920099685.4 discloses a kind of equipment of mix refrigerant liquefaction flow path of simplification.Aforesaid method and equipment are to adopt two sections compression coolings equally, and cryogen is a gas-liquid two-phase behind the intercooling, and wherein vapor phase refrigerant gets into two sections suctions port of compressor, and liquid phase refrigerant then is provided with an independent runner and gets into ice chest, and through independent J-T valve throttling refrigeration.Simultaneously; In above-mentioned technical scheme; Two sections cooled cryogens of compression of compressor equally also are gas-liquid two-phase; Second knockout drum need be set, and the general liquid phase refrigerant that still needs a less cryogenic fluid pump that second gas-liquid separator is obtained delivers to the ice chest top, its liquefaction process is more complicated also.
China's utility model patent 200920092366.0 discloses a kind of three sections hybrid refrigeration natural gas liquefaction devices; This device is to adopt two sections compression coolings equally; Cryogen is a gas-liquid two-phase behind the intercooling; Wherein vapor phase refrigerant gets into two sections suctions port of compressor, and liquid phase refrigerant then is provided with an independent runner and gets into ice chest, and through independent J-T valve throttling refrigeration.Simultaneously in the disclosed technical scheme of this patent; Two sections cooled cryogens of compression of compressor equally also are gas-liquid two-phase, and second knockout drum need be set, and this patent is again that gas, the liquid two phase cryogens that second knockout drum obtains are provided with runner respectively; And adopt independently J-T valve throttling refrigeration respectively; Thereby one have three cryogen runners, three J-T valves, and its technology is more complicated also.
China utility model patent 201020218282.X discloses and has a kind ofly adopted single mixing medium to freeze to come the device of natural gas liquids, and what this device adopted is three grades of compressions, and flow process is complicacy more.
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 natural gas liquefaction process; On the basis that keeps single loop mixed refrigerant process higher-energy level of efficiency, provide a kind of technical process more to simplify, can reduce or eliminate the technical process of gas-liquid two-phase azeotrope assignment of traffic problem.
The present invention also provides a kind of natural gas liquefaction process equipment, adopts aluminum braze welding type plate-fin cryogenic heat exchanger as ice chest, and this equipment can be used in above-mentioned natural gas liquefaction process provided by the present invention.
For achieving the above object, the present invention at first provides a kind of two-part single loop mix refrigerant natural gas liquefaction process, and it may further comprise the steps:
Mix refrigerant is carried out carrying out a gas-liquid separation after two sections compression coolings, obtain vapor phase refrigerant and liquid phase refrigerant, wherein, after first section compression cooling, mix refrigerant is a gaseous state;
Make liquid phase refrigerant get into the throttling cooling of ice chest cooling back, and return the cold that ice chest provides high potential temperature;
Make vapor phase refrigerant get into ice chest and be cooled to throttling cooling behind the low temperature, return the cold that ice chest at first provides low potential temperature, then with throttling after return ice chest liquid phase refrigerant converge, the cold of high potential temperature is provided jointly;
Mix refrigerant after the cold that high potential temperature is provided is carried out two sections compression coolings, carry out next one circulation;
Sweet natural gas obtains liquefied natural gas product through throttling after getting into the ice chest cooling again.
According to concrete technical scheme of the present invention, preferably, above-mentioned natural gas liquefaction process can comprise following concrete steps:
Mix refrigerant is carried out carrying out a gas-liquid separation after two sections compression coolings, obtain vapor phase refrigerant and liquid phase refrigerant, wherein, after first section compression cooling, mix refrigerant is a gaseous state;
Throttling cooling after making liquid phase refrigerant entering ice chest be cooled to-50 ℃ to-65 ℃, and return ice chest, after the vapor phase refrigerant of returning after the throttling is mixed, the cold of high potential temperature section is provided together;
The cold that ice chest at first provides low potential temperature is returned in throttling cooling after making vapor phase refrigerant entering ice chest be cooled to-151 ℃ to-162 ℃, and it, is converged with the liquid phase refrigerant that returns after the throttling after-50 ℃ to-65 ℃ by rewarming, and the cold of high potential temperature is provided jointly;
Mix refrigerant after the cold that high potential temperature is provided is carried out two sections compression coolings, carry out next one circulation;
Sweet natural gas gets into ice chest and is cooled to-151 ℃ or lower temperature, obtains liquefied natural gas product through throttling again.
In above-mentioned natural gas liquefaction process, mix refrigerant provides in ice chest after the cold, promptly accomplishes a refrigeration cycle, carries out two sections next refrigeration cycle of compression beginning then again.Preferably, the molar percentage of the mix refrigerant that is adopted consists of: methane, 16-22%, ethene or ethane, 33-39%, propane, 15-21%, iso-pentane, 12-18%, nitrogen, 8-14%; The molar percentage sum of all components satisfies 100%.More preferably, the molar percentage of said mix refrigerant consists of: methane, 18.89%, ethene or ethane, 36.08%, propane, 18.37%, iso-pentane, 15.42%, nitrogen, 11.24%.According to the difference of the composition of raw natural gas, the composition of mix refrigerant can change in above-mentioned scope.
In above-mentioned natural gas liquefaction process; Preferably, two sections compression coolings being adopted are meant: mix refrigerant is compressed to 600-1000kPa (being preferably 847kPa), is cooled to 25 ℃-45 ℃ or room temperature again; At this moment; Mix refrigerant all is a gas phase, and second-compressed is cooled to 25 ℃-45 ℃ or room temperature again to 3500-4500kPa (being preferably 4080kPa) then.Mix refrigerant is through two sections compression coolings, and wherein, (first section cooling) cooled off in the centre, and afterwards, mix refrigerant still remains gas phase, need not carry out gas-liquid separation, has also just saved the difficulty that vapor phase refrigerant and liquid phase refrigerant are handled respectively.Simultaneously, in two sections compression process of cooling, the intercooling temperature can be adjusted according to actual condition, can be through the intercooling temperature is adjusted in the control of heat-eliminating medium.When operating mode occurs when unusual; After through first section compression cooling; May produce the liquid phase refrigerant of minute quantity; For this part a spot of liquid phase refrigerant, it is heated make its gasification just passable as long as an electric heater is set, also can draw this part liquid phase refrigerant heated from the vapor phase refrigerant of second compressor outlet and make its gasification lacking part.
In above-mentioned natural gas liquefaction process, preferably, the pressure-controlling of vapor phase refrigerant after throttling is 350-450kPa, more preferably 420kPa.
In above-mentioned natural gas liquefaction process, preferably, Sweet natural gas, vapor phase refrigerant and liquid phase refrigerant all get into from the top of ice chest, in ice chest, flow from top to bottom and temperature reduces gradually.The top of ice chest is high potential temperature (or claiming high potential temperature section), and the bottom is low potential temperature (or claiming low potential temperature section).Sweet natural gas can purify pre-treatment according to the mode of routine before getting into ice chest, remove impurity wherein.
The present invention also provides a kind of natural gas liquefaction device, and it comprises first suction tank, first compressor, first water cooler, second suction tank, second compressor, second water cooler, knockout drum, ice chest, first throttle valve, second throttling valve, wherein,
Above-mentioned ice chest has four runners, is respectively first flow, second runner, the 3rd runner and the 4th runner;
The inlet of the outlet of first suction tank and first compressor passes through pipe connection;
The inlet of the outlet of first compressor and first water cooler passes through pipe connection;
The inlet of the outlet of first water cooler and second suction tank passes through pipe connection;
The inlet of the outlet of second suction tank and second compressor passes through pipe connection;
The inlet of the outlet of second compressor and second water cooler passes through pipe connection;
The outlet of second water cooler and the inlet of knockout drum pass through pipe connection;
The inlet of second runner of the pneumatic outlet of knockout drum and ice chest is through pipe connection, and the inlet of the 3rd runner of the liquid exit of knockout drum and ice chest passes through pipe connection;
The inlet of the outlet of second runner and the 4th flow field end is through pipe connection, and the pipeline between the two is provided with the first throttle valve, and the first throttle valve is positioned at the outside of ice chest;
The inlet at the outlet of the 3rd runner and the 4th runner middle part is through pipe connection, and the pipeline between the two is provided with second throttling valve, and second throttling valve is positioned at the outside of ice chest;
The inlet of the outlet of the 4th runner and first suction tank passes through pipe connection;
The first flow of ice chest is a natural-gas transfer pipeline.
In above-mentioned natural gas liquefaction device, each concrete device can adopt this area the device that usually adopts, wherein, first compressor and first water cooler are used for mix refrigerant is carried out first section compression cooling; Second compressor and second water cooler are used for mix refrigerant is carried out second section compression cooling; Knockout drum is used for carrying out gas-liquid separation through two sections compression refrigerative mix refrigerants; Ice chest is used for the cold and hot exchange of mix refrigerant and Sweet natural gas, so that natural gas liquefaction; The first throttle valve and second throttling valve are respectively applied for vapor phase refrigerant and liquid phase refrigerant are carried out the throttling cooling.
In above-mentioned natural gas liquefaction device; Preferably, the ingress of the first flow of ice chest is connected with the Sweet natural gas input channel, and; This Sweet natural gas input channel is provided with purifying device for natural gas and the 3rd throttling valve; The exit of the first flow of ice chest is connected with the Sweet natural gas output channel, and this Sweet natural gas output channel is provided with the product valve.
In above-mentioned natural gas liquefaction device, preferably, the ice chest that is adopted is the plate-fin ice chest, and the core component of this plate-fin ice chest is an aluminum braze welding type plate-fin cryogenic heat exchanger.Two-part single loop mix refrigerant natural gas liquefaction process provided by the present invention and equipment are suitable for adopting the plate-fin ice chest, but also can adopt the ice chest of other structural shape.
In above-mentioned natural gas liquefaction device, preferably, the compressor that is adopted (first compressor, second compressor) is the centrifugal mix refrigerant compressor of compression.
In above-mentioned natural gas liquefaction device, preferably, the water cooler that is adopted (first water cooler, second water cooler) is air-cooler and/or watercooler etc.
In above-mentioned natural gas liquefaction device; Preferably; Ice chest is divided into high potential temperature section and low potential temperature section, and first flow, second runner and the 4th runner have distribution in high potential temperature section and low potential temperature Duan Jun, and the 3rd runner only is distributed in high potential temperature section; It is terminal that the end outlet of the 4th runner is positioned at low potential temperature section, and the centre entrance of the 4th runner is between low potential temperature section and high potential temperature section.High potential temperature section is positioned at the top of ice chest, and in this zone, the temperature of Sweet natural gas is higher.Low potential temperature section is positioned at the bottom of ice chest, and in this zone, the temperature relatively-high temperature position section of Sweet natural gas decreases.The high temperature of high potential temperature section is that in fact, two sections temperature is all below normal temperature for the low temperature of low potential temperature section.
In above-mentioned natural gas liquefaction device; Preferably; This natural gas liquefaction device also comprises a cryogen reservoir, and it is connected on the pipeline between the inlet of outlet and first suction tank of the 4th runner, and this cryogen reservoir is used for adding or additional mix refrigerant to equipment.
Under nominal situation, be pure vapor phase refrigerant through first section compression refrigerative mix refrigerant.In order to prevent that a spot of liquid that produces under the unusual service condition from getting into second compressor of mix refrigerant and compressor is produced damage here, second suction tank that is provided with herein can separate small amount of liquid, and whole Processes and apparatus is protected; Flow process and circulation need be set for liquid refrigerant is extra again in the technical process, a small-sized electric heater only be set at the bottom of this second suction tank jar or the less pipeline of a diameter is set and the second compressor outlet place pyritous vapor phase refrigerant is fed the liquid cryogen gasification that makes the minute quantity that produces under the abnormal conditions get final product.Promptly in above-mentioned natural gas liquefaction device; Preferably; Second suction tank is provided with an electric heater, when having liquid phase refrigerant to gather in second suction tank, is used for its heating is made its gasification, perhaps; Second suction tank is connected with the outlet of said second compressor through pipeline, when having liquid phase refrigerant to gather in second suction tank, is used for introducing a small amount of vapor phase refrigerant of leaving the second compressor outlet place and is used for liquid phase refrigerant to second suction tank and heats and make its gasification.
After two sections cooled vapor phase refrigerant of compression and the gas-liquid separation of liquid phase refrigerant process; Be delivered to the corresponding runner inlet at ice chest top respectively; And adopt two throttle valve control respectively, so both avoided the employing cryogenic fluid pump to carry liquid phase refrigerant, meanwhile; Only adopt two sections refrigerative flow processs; Only adopt a gas-liquid separation just can be divided into two strands of refrigeration agents, compare with the liquefaction process and the syllogic single loop mix refrigerant liquefaction process of twice gas-liquid separation of existing needs, its energy consumption level quite and technical process is simpler.
The flow process of natural gas liquefaction process provided by the present invention and equipment is fairly simple, and output investment ratio is lower, has liquefied fraction height, low power consumption and other advantages simultaneously.
Description of drawings
The structural representation of the natural gas liquefaction device that Fig. 1 provides for embodiment 1.
Main drawing reference numeral explanation:
First suction tank, 1 first compressor, 2 first water coolers 3
Second suction tank, 4 second compressors, 5 second water coolers 6
Knockout drum 7 plate-fin ice chests 8 first throttle valves 9
Second throttling valve, 10 cleaners 11 the 3rd throttling valve 12
Product valve 13 holders 14
Embodiment
To understand in order technical characterictic of the present invention, purpose and beneficial effect being had more clearly, technical scheme of the present invention is carried out following detailed description, but but can not be interpreted as qualification at present practical range of the present invention.
Embodiment 1
Present embodiment provides a kind of two-part single loop mix refrigerant natural gas liquefaction device; Its structure is as shown in Figure 1; This natural gas liquefaction device comprises: first suction tank 1, first compressor 2, first water cooler 3, second suction tank 4, second compressor 5, second water cooler 6, knockout drum 7, plate-fin ice chest 8, first throttle valve 9, second throttling valve 10, wherein:
Plate-fin ice chest 8 adopts aluminum braze welding type plate-fin cryogenic heat exchanger, and it is provided with four runners, and is as shown in Figure 1, and the leftmost side is first flow (natural-gas transfer pipeline), is followed successively by second runner, the 3rd runner, the 4th runner then from left to right;
First compressor 2 and second compressor 5 all adopt two sections centrifugal hybrid refrigeration machine compressors of compression;
First water cooler 3 and second water cooler 6 all adopt air cooler;
The inlet of the outlet of first suction tank 1 and first compressor 2 passes through pipe connection;
The inlet of the outlet of first compressor 2 and first water cooler 3 passes through pipe connection;
The inlet of the outlet of first water cooler 3 and second suction tank 4 passes through pipe connection;
The inlet of the outlet of second suction tank 4 and second compressor 5 passes through pipe connection;
The inlet of the outlet of second compressor 5 and second water cooler 6 passes through pipe connection;
The inlet of the outlet of second water cooler 6 and knockout drum 7 passes through pipe connection;
The inlet of second runner of the pneumatic outlet of knockout drum 7 and plate-fin ice chest 8 is through pipe connection, and the inlet of the 3rd runner of the liquid exit of knockout drum 7 and plate-fin ice chest 8 passes through pipe connection;
The inlet of the outlet of second runner and the 4th flow field end is through pipe connection, and the pipeline between the two is provided with first throttle valve 9, and first throttle valve 9 is positioned at the outside of plate-fin ice chest 8;
The inlet at the outlet of the 3rd runner and the 4th runner middle part is through pipe connection, and the pipeline between the two is provided with the outside that second throttling valve, 10, the second throttling valve 10 are positioned at plate-fin ice chest 8;
The inlet of the outlet of the 4th runner and first suction tank 1 passes through pipe connection;
The ingress of the first flow of plate-fin ice chest 8 is connected with the Sweet natural gas input channel; And; This Sweet natural gas input channel is provided with natural gas conditioning device 11 and the 3rd throttling valve 12; The exit of the first flow of plate-fin ice chest 8 is connected with the Sweet natural gas output channel, and this Sweet natural gas output channel is provided with product valve 13 and holder 14.
Embodiment 2
Present embodiment provides a kind of two-part single loop mix refrigerant natural gas liquefaction process, and the technology that its equipment that is employing embodiment 1 provides carries out natural gas liquefaction comprises following concrete steps:
Be that the mix refrigerant of 350kPa to 450kPa (being preferably 420kPa) is compressed in 600kPa to the 1000kPa scope by first compressor 2 and (is preferably 847kPa) with pressure; Be cooled to 25 ℃ to 45 ℃ (relevant) by first water cooler 3 again with envrionment temperature; Suck by second suction tank 4 again; Get into second compressor 5 then and be compressed to 3500kPa to 4500kPa (being preferably 4080kPa), be cooled to 25 ℃ to 45 ℃ (relevant) by second water cooler 6 again with envrionment temperature;
This moment, mix refrigerant was a gas-liquid two-phase; After input knockout drum 7 carries out gas-liquid separation, obtain vapor phase refrigerant and liquid phase refrigerant, the two is handled respectively: liquid phase refrigerant gets in the plate-fin ice chest 8 through the 3rd runner of plate-fin ice chest 8; And after precooling is to-50 ℃ to-65 ℃, leave plate-fin ice chest 8; Through returning plate-fin ice chest 8 after second throttling valve, the 10 throttlings cooling, after the vapor phase refrigerant of returning after the throttling is mixed, the cold of high potential temperature section is provided together; Vapor phase refrigerant is after leaving knockout drum 8; Second runner through plate-fin ice chest 8 gets in the plate-fin ice chest 8, and leaves plate-fin ice chest 8 after being cooled to-151 ℃ to-162 ℃, after first throttle valve 9 throttlings cooling; Returning plate-fin ice chest 8 provides the cold of low potential temperature section; Self is converged with the liquid phase refrigerant that returns after the throttling by rewarming to the temperature identical with the liquid phase refrigerant precooling temperature (in 50 ℃ to-65 ℃ scopes), and the cold of high potential temperature section is provided jointly;
Mix refrigerant behind the rewarming returns first suction tank 1, accomplishes one time refrigeration cycle, and begins to get into refrigeration cycle next time;
Virgin gas cleaner 11 purify remove impurity and through the 3rd throttling valve 12 after; First flow through plate-fin ice chest 8 gets into plate-fin ice chest 8; With the refrigeration agent heat exchange, virgin gas is cooled to-151 ℃ to-162 ℃ and liquefaction, through obtaining the LNG product after 13 throttlings of product valve; Get into holder (for example LNG basin) 14, accomplish gas deliquescence process.
In above-mentioned technology; The molar percentage of the mix refrigerant that is adopted consists of: methane, 16-22% (being preferably 18.89%); Ethene or ethane, 3-39% (being preferably 36.08%); Propane, 15-21% (being preferably 18.37%), iso-pentane, 12-18% (being preferably 15.42%), nitrogen, 8-14% (being preferably 11.24%).
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; And be not used in qualification protection scope of the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. two-part single loop mix refrigerant natural gas liquefaction process, it may further comprise the steps:
Mix refrigerant is carried out carrying out a gas-liquid separation after two sections compression coolings, obtain vapor phase refrigerant and liquid phase refrigerant, wherein, after first section compression cooling, mix refrigerant is a gaseous state;
Make liquid phase refrigerant get into the throttling cooling of ice chest cooling back, and return the cold that ice chest provides high potential temperature;
Make vapor phase refrigerant get into ice chest and be cooled to throttling cooling behind the low temperature, return the cold that ice chest at first provides low potential temperature, then with throttling after return ice chest liquid phase refrigerant converge, the cold of high potential temperature is provided jointly;
Mix refrigerant after the cold that high potential temperature is provided is carried out two sections compression coolings, carry out next one circulation;
Sweet natural gas obtains liquefied natural gas product through throttling after getting into the ice chest cooling again;
Wherein, the molar percentage of said mix refrigerant consists of: methane, 16-22%, and ethene or ethane, 33-39%, propane, 15-21%, iso-pentane, 12-18%, nitrogen, 8-14%, the molar percentage sum of all components satisfies 100%;
Said two sections compression coolings are meant: mix refrigerant is compressed to 600-1000kPa, is cooled to 25 ℃-45 ℃ or room temperature again, second-compressed is cooled to 25 ℃-45 ℃ or room temperature again to 3500-4500kPa then.
2. natural gas liquefaction process according to claim 1, wherein, this technology may further comprise the steps:
After mix refrigerant carried out two sections compression coolings, carry out a gas-liquid separation, obtain vapor phase refrigerant and liquid phase refrigerant, wherein, after first section compression cooling, mix refrigerant is a gaseous state;
Throttling cooling after making liquid phase refrigerant entering ice chest be cooled to-50 ℃ to-65 ℃, and return ice chest, after the vapor phase refrigerant of returning after the throttling is mixed, the cold of high potential temperature section is provided together;
The cold that ice chest at first provides low potential temperature is returned in throttling cooling after making vapor phase refrigerant entering ice chest be cooled to-151 ℃ to-162 ℃, and it, is converged with the liquid phase refrigerant that returns after the throttling after-50 ℃ to-65 ℃ by rewarming, and the cold of high potential temperature is provided jointly;
Mix refrigerant after the cold that high potential temperature is provided is carried out two sections compression coolings, carry out next one circulation;
Sweet natural gas gets into ice chest and is cooled to-151 ℃ or lower temperature, obtains liquefied natural gas product through throttling again.
3. natural gas liquefaction process according to claim 1 and 2, wherein, the pressure-controlling of said vapor phase refrigerant after throttling is 350-450kPa.
4. natural gas liquefaction process according to claim 1 and 2, wherein, said Sweet natural gas, said vapor phase refrigerant and said liquid phase refrigerant all get into from the top of said ice chest, in said ice chest, flow from top to bottom and temperature reduces gradually.
5. natural gas liquefaction device, it comprises first suction tank, first compressor, first water cooler, second suction tank, second compressor, second water cooler, knockout drum, ice chest, first throttle valve, second throttling valve, wherein,
Said ice chest has four runners, is respectively first flow, second runner, the 3rd runner and the 4th runner;
The inlet of the outlet of said first suction tank and said first compressor passes through pipe connection;
The inlet of the outlet of said first compressor and said first water cooler passes through pipe connection;
The inlet of the outlet of said first water cooler and said second suction tank passes through pipe connection;
The inlet of the outlet of said second suction tank and said second compressor passes through pipe connection;
The inlet of the outlet of said second compressor and said second water cooler passes through pipe connection;
The outlet of said second water cooler and the inlet of said knockout drum pass through pipe connection;
The inlet of second runner of the pneumatic outlet of said knockout drum and said ice chest is through pipe connection, and the inlet of the 3rd runner of the liquid exit of said knockout drum and said ice chest passes through pipe connection;
The inlet of the outlet of said second runner and said the 4th flow field end is through pipe connection, and the pipeline between the two is provided with the first throttle valve, and said first throttle valve is positioned at the outside of said ice chest;
The inlet at the outlet of said the 3rd runner and said the 4th runner middle part is through pipe connection, and the pipeline between the two is provided with second throttling valve, and said second throttling valve is positioned at the outside of said ice chest;
The inlet of the outlet of said the 4th runner and said first suction tank passes through pipe connection;
The first flow of said ice chest is a natural-gas transfer pipeline.
6. natural gas liquefaction device according to claim 5; Wherein, the ingress of the first flow of said ice chest is connected with the Sweet natural gas input channel, and; This Sweet natural gas input channel is provided with purifying device for natural gas and the 3rd throttling valve; The exit of the first flow of said ice chest is connected with the Sweet natural gas output channel, and this Sweet natural gas output channel is provided with the product valve.
7. natural gas liquefaction device according to claim 5; Wherein, Said ice chest is divided into high potential temperature section and low potential temperature section, and said first flow, second runner and the 4th runner have distribution in said high potential temperature section and low potential temperature Duan Jun, and said the 3rd runner only is distributed in said high potential temperature section; It is terminal that the end outlet of said the 4th runner is positioned at low potential temperature section, and the centre entrance of said the 4th runner is between said low potential temperature section and high potential temperature section.
8. natural gas liquefaction device according to claim 5; Wherein, Said ice chest is the plate-fin ice chest; The core component of this plate-fin ice chest is an aluminum braze welding type plate-fin cryogenic heat exchanger, and said compressor is the centrifugal mix refrigerant compressor of compression, and said water cooler is air-cooler or watercooler.
9. natural gas liquefaction device according to claim 5, wherein, this natural gas liquefaction device also comprises a cryogen reservoir, it is connected on the pipeline between the inlet of outlet and said first suction tank of said the 4th runner.
10. natural gas liquefaction device according to claim 5; Wherein, Said second suction tank is provided with an electric heater; When having liquid phase refrigerant to gather in second suction tank, be used for its heating is made its gasification; Perhaps, said second suction tank is connected with the outlet of said second compressor through pipeline, when having liquid phase refrigerant to gather in second suction tank, is used for introducing a small amount of vapor phase refrigerant of leaving the second compressor outlet place and is used for liquid phase refrigerant to second suction tank and heats and make its gasification.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103411337A (en) * | 2013-08-02 | 2013-11-27 | 北京麦科直通石化工程设计有限公司 | System and method for improving refrigerating capacity of olefin separating device |
| CN103673501A (en) * | 2013-12-11 | 2014-03-26 | 辽宁哈深冷气体液化设备有限公司 | Efficient multistage throttling LNG device and method for producing LNG |
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| CN105066584A (en) * | 2015-07-31 | 2015-11-18 | 华南理工大学 | Single-stage mixed refrigerant natural gas liquefaction flow operation regulation system and method |
| CN105157289A (en) * | 2015-10-10 | 2015-12-16 | 税建平 | Filling method of composite refrigerant for MRC refrigeration cycle |
| CN105674686A (en) * | 2016-01-15 | 2016-06-15 | 成都赛普瑞兴科技有限公司 | Method and device for liquefying methane-rich gas through expansion refrigeration |
| CN106766670A (en) * | 2017-01-06 | 2017-05-31 | 四川杰瑞恒日天然气工程有限公司 | natural gas refrigeration system and method |
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| CN117759344A (en) * | 2023-12-13 | 2024-03-26 | 北京恒泰洁能科技有限公司 | Device and method for LNG cold energy power generation through DMRC circulation |
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| CN103411337A (en) * | 2013-08-02 | 2013-11-27 | 北京麦科直通石化工程设计有限公司 | System and method for improving refrigerating capacity of olefin separating device |
| CN103673501A (en) * | 2013-12-11 | 2014-03-26 | 辽宁哈深冷气体液化设备有限公司 | Efficient multistage throttling LNG device and method for producing LNG |
| CN104089463A (en) * | 2014-07-16 | 2014-10-08 | 北京安珂罗工程技术有限公司 | Mixed refrigerant gas-liquid separating type throttling and refrigerating method and system |
| CN104089463B (en) * | 2014-07-16 | 2017-11-17 | 北京安珂罗工程技术有限公司 | A kind of method and system of azeotrope gas-liquid separating throttling refrigeration |
| CN105066584A (en) * | 2015-07-31 | 2015-11-18 | 华南理工大学 | Single-stage mixed refrigerant natural gas liquefaction flow operation regulation system and method |
| CN105157289A (en) * | 2015-10-10 | 2015-12-16 | 税建平 | Filling method of composite refrigerant for MRC refrigeration cycle |
| CN105674686B (en) * | 2016-01-15 | 2018-09-14 | 成都赛普瑞兴科技有限公司 | A kind of liquefied method and device of swell refrigeration high methane gas |
| CN105674686A (en) * | 2016-01-15 | 2016-06-15 | 成都赛普瑞兴科技有限公司 | Method and device for liquefying methane-rich gas through expansion refrigeration |
| CN107556969A (en) * | 2016-06-30 | 2018-01-09 | 中石化洛阳工程有限公司 | A kind of working medium to be generated electricity for cold energy of liquefied natural gas organic Rankine bottoming cycle |
| CN107556969B (en) * | 2016-06-30 | 2020-09-08 | 中石化洛阳工程有限公司 | Working medium for liquefied natural gas cold energy organic Rankine cycle power generation |
| CN106766670A (en) * | 2017-01-06 | 2017-05-31 | 四川杰瑞恒日天然气工程有限公司 | natural gas refrigeration system and method |
| CN107917578B (en) * | 2017-11-13 | 2019-10-25 | 益通天然气股份有限公司 | A kind of mixed-refrigerant cycle liquefied natural gas self-purifying system |
| CN107917578A (en) * | 2017-11-13 | 2018-04-17 | 益通天然气股份有限公司 | A kind of mixed-refrigerant cycle liquefied natural gas self-purifying system |
| CN117759344A (en) * | 2023-12-13 | 2024-03-26 | 北京恒泰洁能科技有限公司 | Device and method for LNG cold energy power generation through DMRC circulation |
| CN117759344B (en) * | 2023-12-13 | 2024-06-21 | 北京恒泰洁能科技有限公司 | Device and method for LNG cold energy power generation through DMRC circulation |
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