CN106524666A - Integral mobile natural gas liquefaction device - Google Patents

Integral mobile natural gas liquefaction device Download PDF

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Publication number
CN106524666A
CN106524666A CN201610960718.4A CN201610960718A CN106524666A CN 106524666 A CN106524666 A CN 106524666A CN 201610960718 A CN201610960718 A CN 201610960718A CN 106524666 A CN106524666 A CN 106524666A
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China
Prior art keywords
unit
heat exchanger
tower
natural gas
molecular sieve
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Granted
Application number
CN201610960718.4A
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Chinese (zh)
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CN106524666B (en
Inventor
龚晓科
穆云飞
赵阳
王安胜
幸涛
陈宏伟
唐刚
杨敏
王婷
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YINCHUAN TIANJIA ENERGY TECHNOLOGY Co Ltd
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YINCHUAN TIANJIA ENERGY TECHNOLOGY Co Ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0211—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
    • F25J1/0214—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/0097—Others, e.g. F-, Cl-, HF-, HClF-, HCl-hydrocarbons etc. or mixtures thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0211—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
    • F25J1/0214—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle
    • F25J1/0215—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle with one SCR cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0259—Modularity and arrangement of parts of the liquefaction unit and in particular of the cold box, e.g. pre-fabrication, assembling and erection, dimensions, horizontal layout "plot"
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0262—Details of the cold heat exchange system
    • F25J1/0264—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams
    • F25J1/0265—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer
    • F25J1/0268—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer using a dedicated refrigeration means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/60—Natural gas or synthetic natural gas [SNG]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/02—Separating impurities in general from the feed stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

The invention discloses an integral mobile natural gas liquefaction device which is assembled in a mobile and integral manner. The device comprises a heavy hydrocarbon removal unit, a decarbonization unit, a dehydration unit, a liquefaction unit, an amine liquid regeneration unit, a cooling unit and a public project. The liquefaction device is characterized in that a mixed refrigerant and R22 are taken as cryogens to provide a refrigerating capacity for natural gas liquefaction; R134a and air cooling are combined to take the place of a traditional water cooling system, so rapid and convenient use of natural gas in areas which have not water supply and lack water becomes possible; and natural gas liquefaction can be achieved basically without pipeline laying on the ground. According to the invention, a sub-set mode is replaced by an integral machine mode, so floor space of equipment is further reduced; operations are more flexible; moving and assembly are convenient; operations and repair are simple; and consumption of manpower and materials is reduced. New technologies are used, so energy consumption is reduced; the degree of automation is greatly increased; the problem of water source lack is solved; and the device is applicable to various nonconventional gases and complicated terrains, so the utilization rate of the nonconventional gases can be increased greatly.

Description

Integral mobile natural gas liquefaction device
Technical field：
The invention belongs to natural gas pretreatment and the device for liquefying, and in particular to a kind of Integral mobile natural gas liquid Makeup is put.
Background technology：
Traditional LNG liquefaction plants establish formality complexity, and cost of investment is high, and the construction period is long, and floor space is big, and technique is multiple Miscellaneous, overall high energy consumption, the scope of application are limited, and are not suitable for being used with gas for the places such as remote mountain areas Gu Jing, individual well.Based on very Rule construction of natural gas fields difficulty is big, geographical position residing for gas well is complicated, laying pipeline is out of reach, at present, of the prior art to set Standby major part is to divide a device into different modules by function, mainly based on Modular moving liquefaction equipment, wherein work of freezing Skill is mainly using the nitrogen expansion process of relative maturity；Absorption tower and regenerator adopt single high tower, and device height is higher, and transport is deposited In limitation.Therefore, it is to solve traditional liquefaction plant floor space greatly, reduction construction period length, cost are big, integrated low, can not The practical problem such as mobile, applicant are developed and a kind of are connected simultaneously to realize what decarburization and amine liquid regenerated using low tower using multitower Purpose gives the Integral mobile natural gas liquefaction equipment of balance to the energy of the whole circulatory system, had both saved equipment and has taken up an area sky Between, and saving energy consumption.
The content of the invention：
For the problem for overcoming prior art to exist, the present invention provides a kind of Unconventional gas that is used for and pre-processes and liquefy Integral mobile device, its simple structure, product purity height, process is simple, low easy to operate, energy consumption, system stability, volume It is little, it is readily transported, realizes Highgrade integration, self-contained, the new breakthrough of convenient transport of one.
To solve above-mentioned technical problem, the present invention takes technical scheme below：
Integral mobile natural gas liquefaction device, is assembled by the way of removable movement and motor-driven integrative, and which includes de- weight Hydrocarbon unit, decarburization unit, dewatering unit, liquefaction unit, amine liquid regeneration unit, cooling unit, public work.
De- heavy hydrocarbon unit includes active carbon purifying tower A and active carbon purifying tower B, i.e. unstripped gas Jing active carbon purifyings tower A, work Property carbon purifying tower B removing heavy hydrocarbon；
Decarburization unit includes that raw material gas-liquid separator, decarbonizing tower group, dust filter unit I, knockout drum, i.e. unstripped gas enter first Free water and fraction solids impurity are removed in entering raw material gas-liquid separator, the gas of the most of water of removing is introduced into de- heavy hydrocarbon unit Removing heavy hydrocarbon, enters back into decarbonizing tower group removing CO2Afterwards, the activated charcoal solid impurity that the removing of Jing dust filter units I is carried, Ran Houjin Enter knockout drum and separate the liquid wherein carried secretly, finally remove dewatering unit removing moisture；
The decarbonizing tower group is composed in series by several decarbonizing towers, i.e. the gas that the de- heavy hydrocarbons of Jing are processed is Jing into decarbonizing tower The series flow of several towers is crossed, i.e., is entered in tower from the middle and lower part position of each tower, toward the amine that the process and tower top for rising declines Liquid counter current contacting, CO therein2Absorbed；Tower top gas out sequentially enters next tower continuation absorption again and does not wherein remove CO2。
Dewatering unit includes molecular sieve tower I, regeneration Gas Cooler, fuel gas surge tank, dust filter unit II, i.e., from decarburization Unit knockout drum unstripped gas out is entered in tower by the top of molecular sieve tower I, and through molecular sieve, moisture therein is by molecular sieve Absorb, clean unstripped gas is flowed out from I bottom of molecular sieve tower goes to liquefaction unit；When molecular sieve adsorption impurity reaches saturation, High Temperature Gas Jing sequencing valve into reproduced state, i.e. electric heater enters molecular sieve tower I by bottom of towe, will be miscellaneous on molecular sieve in tower Matter is taken away from tower top, then Jing after regeneration Gas Cooler is cooled to normal temperature, goes to fuel gas surge tank；The original of I bottom of molecular sieve tower Material gas removes chalk dust removing through dust filter unit II, becomes clean gas；
Liquefaction unit include the pre- cold compressor of ice chest, R22, air-cooled exchanger, R22 storage tanks, mix refrigerant compressor, one Level oil expeller, R22 precool heat exchanger devices, two grades of oil expellers, three-level oil expeller, molecular sieve towers II, LNG storage tank, i.e., from dewatering unit The process that cooled down in ice chest of the lustration raw material gas that comes of molecular sieve be by cryogenic coolant freon and mix refrigerant Liquid LNG is condensed into, is specifically cooled down in ice chest from the lustration raw material gas that the molecular sieve of dewatering unit comes, from R22 The freon that pre- cold compressor comes is condensed into liquid phase through R22 precool heat exchanger devices, into after R22 storage tanks, enters through choke valve Low-temperature receiver of the row throttling cooling as R22 precool heat exchanger devices；The mix refrigerant come from mix refrigerant compressor is through one-level Oil expeller isolates mix refrigerant and compressor oil, is cooled down in respectively enteing air-cooled exchanger；Compressor oil is from air cooling Heat exchanger is out returned in mix refrigerant compressor, and mix refrigerant after air-cooled exchanger sequentially enters two grades and removes After oily device, three-level oil expeller, molecular sieve tower, dust filter unit, after cooling down in ice chest, into raw material gas-liquid separator, gas After mutually further cooling down in ice chest as low-temperature receiver with liquid phase point two-way, after warp knuckle stream valve carries out throttling cooling, into after ice chest, Return in mix refrigerant compressor；
The ice chest includes precool heat exchanger device, main cold heat exchanger one, main cold heat exchanger two and crosses four heat exchange of cold heat exchanger Device, four heat exchangers are encapsulated in the casing of a sealing, and filling pearlife carries out cold insulation.Wherein, unstripped gas sequentially passes through precooling After heat exchanger, main cold heat exchanger one, into heavy hydrocarbon knockout drum, heavy hydrocarbon is separated, remaining unstripped gas enters the cold heat exchange of master After device two, into knockout drum, wherein gas phase sequentially passes through main cold heat exchanger two, main cold heat exchanger one, pre- as flashed vapour After cold heat exchanger reclaims cold, dewatering unit is removed as reflux gas；Unstripped gas is divided into two-way, and sub-fraction is passed through as cold air is crossed Choke valve throttling cooling after, entered in cold heat exchanger as low-temperature receiver, remaining unstripped gas after cold heat exchanger and choke valve, The LNG product of supercooling is obtained final product, in LNG storage tank.
Amine liquid regeneration unit include regenerator, amine liquid filter, lean solution cooler, lean pump, amine liquid storage tank, reboiler, CO2Discharge gas condenser, discharge gas-liquid separator, i.e. the amine liquid from decarbonizing tower bottom out must go to regeneration, and regenerative process is right Amine liquid is heated so as in CO2The physical process for being desorbed out.From decarbonizing tower bottom amine liquid out through regenerator solution After suction, Jing amine liquid filters reclaim its heat, then Jing lean solution coolers are cooled to normal temperature, most after Jing lean pumps return in decarbonizing tower Absorb CO2；Regeneration tower bottom amine liquid out enters amine liquid storage tank, and bottom and the reboiler of amine liquid storage tank are connected；From regeneration Tower CO out2Carry substantial amounts of vapor, first Jing CO secretly2Discharge gas condenser by condensate moisture therein into liquid, subsequently into Discharge gas-liquid separator, isolates moisture, CO2Discharge system, moisture are returned in system；
The regenerator is in series by regenerator A, regenerator B, regenerator C, i.e. the amine liquid Jing from decarbonizing tower bottom out Heat exchanger process after by the top of regenerator A enter tower in, amine liquid by bottom of towe Jing connection pump squeeze in regenerator B towers, again and steam Vapour counter current contacting continues desorption CO therein2。
Cooling unit includes that R134a surge tanks, R134a compressors, condensing heat exchanger, fluid reservoir, i.e. cooling unit are to adopt With R134a and the air-cooled cooling procedure for combining, i.e., the R134a for coming from R134a surge tanks enters R134a compressors, Jing pressures After preliminary oil removing is carried out into secondary oil point after contracting, condensed into condensing heat exchanger, condensed R134a enters fluid reservoir Discharge Gas Cooler is entered as cryogen after warp knuckle stream to cool down medium, gas phase R134a come is returned and is returned to R134a bufferings Tank；
Public work includes heat-conducting oil furnace, regeneration hot-air heater, air compressor machine, i.e., conduction oil is carried out adding by heat-conducting oil furnace Heat, the conduction oil of heat are carried out to amine liquid and regeneration gas into reboiler, regeneration hot-air heater A, regeneration hot-air heater B as thermal source Heating；Air compressor machine is carried out to air after purification compression, used as the source of the gas of pneumatic control valve.
The Integral mobile natural gas liquefaction device of the present invention adopts mix refrigerant and R22 as cryogen for natural gas Liquefaction provides refrigerating capacity, instead of traditional water-cooling system with air-cooled combining using R134a, enables the area of anhydrous water shortage fast Victory is convenient to use natural gas and is possibly realized, and can just make natural gas liquefaction without ground laying pipeline substantially.
Extension set group pattern is changed to all-in-one pattern by the Integral mobile natural gas liquefaction device of the present invention, accounts for equipment Ground area further reduces, while more flexibly, being moved easily and assembling.Also improve to some extent on liquefaction process, i.e., by original Water-cooled innovation it is cold with the air-cooled refrigeration modes for combining for R134a, directly using air-cooled, high temperature section is first with wind for low-temperature zone It is cold, recycle R134a coolings to reach the refrigerating capacity of technological requirement, operation maintenance is easy, uses manpower and material resources sparingly；Adopt new technology section Energy consumption is saved, automaticity is increased substantially.
In sum, the beneficial effect of the Integral mobile natural gas liquefaction device is：(1) reduce and invest into This, using water wisely；(2) floor space reduces；(3) construction period shortening, saves for 1/3rd time；(4) solve nothing Water resources problem, is applicable to various unconventional gases, and complicated landform greatly promotes the utilization rate of unconventional gas.
Description of the drawings：
Fig. 1 is the floor plan of Integral mobile natural gas liquefaction device of the present invention；
In figure：1- active carbon purifying tower A, 2- active carbon purifying tower B, 3- raw material gas-liquid separators, 4- decarbonizing tower groups, 5- powder Dirt filter, I A of 6- molecular sieves tower, I B of 7- molecular sieves tower, 8- ice chests, the pre- cold compressors of 9-R22,10- air-cooled exchangers, 11- are mixed Close coolant compressor, 12- one-level oil expellers, 13-R22 precool heat exchanger devices, bis- grades of oil expellers of 14-, 15- three-level oil expellers, 16- Molecular sieve tower II, 17- amine liquid filters, 18- lean solution coolers, 19- amine liquid storage tanks, 20-CO2Discharge gas condenser, 21- discharges Gas-liquid separator, 22- regenerator A, 23- regenerator B, 24- regenerator C, 25-R134a compressors, 26- regeneration hot-air heaters.
Specific embodiment：
Below in conjunction with the accompanying drawings and specific embodiment is described in detail to technical scheme.
As shown in figure 1, Integral mobile natural gas liquefaction device, by de- heavy hydrocarbon list by the way of removable movement and motor-driven integrative Unit, decarburization unit, dewatering unit, liquefaction unit, amine liquid regeneration unit, cooling unit and public work are constituted, wherein：
De- heavy hydrocarbon unit includes that active carbon purifying tower A1 and active carbon purifying tower B2, active carbon purifying tower A1 are net with activated carbon Change tower B2 to be connected；
Decarburization unit includes raw material gas-liquid separator 3, decarbonizing tower group 4, dust filter unit 5 and knockout drum, raw material gas-liquid point It is connected with decarbonizing tower group 4 from device 3, the bottom of towe of decarbonizing tower group 4 is connected on dust filter unit 5, dust filter unit 5 and knockout drum phase Even；Decarbonizing tower group 4 is composed in series by several decarbonizing towers；
Dewatering unit includes molecular sieve tower I, regeneration Gas Cooler, fuel gas surge tank, and molecular sieve tower I is by molecular sieve tower I A6 and I B7 of molecular sieve tower are composed in series, and the tower top of I B7 of I A6 of molecular sieve tower and molecular sieve tower is sequentially connected regeneration Gas Cooler, then Angry cooler is connected with fuel gas surge tank；The bottom of towe of I B7 of I A6 of molecular sieve tower and molecular sieve tower is connected in decarburization unit On dust filter unit 5；
Liquefaction unit includes the pre- cold compressor 9 of ice chest 8, R22, air-cooled exchanger 10, R22 storage tanks, mix refrigerant compression Machine 11, one-level oil expeller 12, R22 precool heat exchangers device 13, two grades of oil expellers 14, three-level oil expeller 15, molecular sieve towers II 16, LNG Storage tank, ice chest 8 are connected with the molecular sieve tower I in dewatering unit, and the pre- cold compressors of R22 9 are connected with R22 precool heat exchangers device 13, R22 Precool heat exchanger device 13 is connected with R22 storage tanks；Mix refrigerant compressor 11 is sequentially connected to one-level oil expeller 12, air-cooled exchanger 10th, on the dust filter unit 5 in two grades of oil expellers 14, three-level oil expeller 15, molecular sieve tower II 16 and decarburization units；LNG storage tank It is connected with ice chest 8；Ice chest 8 includes precool heat exchanger device, main cold heat exchanger one, main cold heat exchanger two and crosses cold heat exchanger, and precooling is changed Hot device, main cold heat exchanger one, main cold heat exchanger two and cold heat exchanger excessively are arranged in the casing of sealing, and pearlife is filled in its gap Carry out cold insulation；Precool heat exchanger device and one one end of main cold heat exchanger are connected on heavy hydrocarbon knockout drum, two one end of main cold heat exchanger It is connected on knockout drum, main cold heat exchanger two, main cold heat exchanger one, the other end of precool heat exchanger device are connected to dewatering unit In；Cross cold heat exchanger to be connected in LNG storage tank；
Amine liquid regeneration unit includes regenerator, amine liquid filter 17, lean solution cooler 18, lean pump, amine liquid storage tank 19, again Boiling device, CO2Discharge gas condenser 20, discharge gas-liquid separator 21, regenerator are connected to the decarbonizing tower bottom of towe in decarburization unit, amine Liquid filter 17 is connected with regenerator, lean solution cooler 18, and lean solution cooler 18 is connected with lean pump；Amine liquid storage tank 19 is connected to The bottom of regenerator, bottom and the reboiler of amine liquid storage tank 19 are connected；CO2Discharge gas condenser 20 and regenerator, discharge gas Liquid/gas separator 21 is connected；Regenerator is in series by regenerator A22, regenerator B23, regenerator C24；
Cooling unit includes R134a surge tanks, R134a compressors 25, condensing heat exchanger, fluid reservoir, discharge Gas Cooler, R134a surge tanks are connected with R134a compressors 25, and R134a compressors 25 are connected with condensing heat exchanger, and condensing heat exchanger is connected to On fluid reservoir；Fluid reservoir is connected with discharge Gas Cooler；
Public work include heat-conducting oil furnace, regeneration hot-air heater 26, air compressor machine, heat-conducting oil furnace successively with amine liquid regeneration unit In reboiler, regeneration hot-air heater 26 connect；Air compressor machine is carried out to air after purification compression, used as the gas of pneumatic control valve Source.
The Integral mobile natural gas liquefaction device is used in Unconventional gas preprocessing process, and each unit is concrete Operation is as follows：
De- heavy hydrocarbon unit be unstripped gas Jing this module remove contain carbon dioxide, water, heavy hydrocarbon, the impurity such as mercury, to reach Go the index of later liquefaction module.I.e. unstripped gas Jing water jackets stove heat first, carries out reducing pressure by regulating flow after having heated, drops to 40bar, removes free water and some solid impurities subsequently into raw material gas-liquid separator 3.The gas of the most of water of removing is entered Active carbon purifying tower A1 and active carbon purifying tower B2 removing heavy hydrocarbon, then Jing dust filter units 5 removing carry activated charcoal solid it is miscellaneous Matter.
Decarburization unit is 4 carbon dioxide removal of decarbonizing tower group that the gas that the de- heavy hydrocarbons of Jing are processed goes that six towers are connected.Using MDEA amine liquid goes to absorb CO2, raw gas flow 2100Nm3/ h, amine flow quantity 12m3/ h, i.e. unstripped gas are from the middle and lower part of each tower Position is entered in tower, toward the amine liquid counter current contacting that the process and tower top for rising declines, CO therein2Absorbed；Tower top gas out Body sequentially enters next tower again to be continued to absorb the CO wherein not removed2.Whole process gas is series flow through six towers, But the amine liquid that each tower top stream is entered is that by six roots of sensation arm, stream enters in each tower respectively from house steward, then each bottom of towe stream of Jing After going out, house steward is pooled to, after going to regeneration unit removing carbon dioxide therein, is recycled back continuation and absorbs.From last Unstripped gas at the top of individual decarbonizing tower out removes knockout drum, separates the liquid wherein carried secretly, then removes dewatering unit removing moisture, takes off The sour gas such as the hydrogen sulfide in unstripped gas are also removed by the process of removing carbon dioxide in the lump.
Dewatering unit is using the moisture in molecular sieve adsorption unstripped gas.Capital equipment is by I A6 of molecular sieve tower and molecular sieve I B7 of tower is constituted.From the 40bar that decarburization unit knockout drum comes, the unstripped gas of normal temperature is entered in tower by the top of molecular sieve tower I, Through molecular sieve, moisture therein is absorbed by molecular sieve, and clean unstripped gas is flowed out from molecular sieve tower bottom goes to liquefaction unit.
After molecular sieve adsorption impurity reaches saturation, absorption cannot be just further continued for, it is necessary to which entering regeneration link will be therein Impurity is sloughed, and can be come into operation again.Regenerating the lustration raw material gas returned using later liquefaction operation (needs to be heated To 260 DEG C) go to blow down the impurity of the inside.The molecular sieve of imurity-removal is due to being haveed broken up for a period of time, in height by 260 DEG C of High Temperature Gas Temperature state, it is impossible to adsorption moisture again of directly taking away, it is necessary to cool to normal temperature, cooling uses the return of later liquefaction module Lustration raw material gas (normal temperature) be passed through in tower molecular sieve blown into cold.Therefore, molecular sieve tower has three kinds of working conditions, is respectively：Work Make, regenerate, blowing cold.
The unstripped gas of normal temperature is entered in tower from I A6 bottoms of molecular sieve tower, is flowed out from tower top.Now I A6 of molecular sieve tower is in Working condition；After the I A6 adsorption saturations of molecular sieve tower, immediately into reproduced state；Now come from electric heater 260 DEG C, The High Temperature Gas Jing sequencing valve of 2bar enters I A6 of molecular sieve tower by bottom of towe, by impurity such as the moisture on molecular sieve in tower from tower top band Walk, this strand of gas will go to the combustion that fuel gas surge tank does the equipment such as boiler, gas electricity generator to after normal temperature Jing regeneration Gas Cooler Material.Need to drop to normal temperature after I A regeneration endings of molecular sieve tower, the 2bar returned by liquefaction unit, normal temperature lustration raw material gas is by bottom of towe Into in tower, molecular sieve is carried out blowing cold.Electric heater is entered back into from the lustration raw material gas of tower top heat out and is heated to 260 I B7 of molecular sieve tower is regenerated into I B7 of molecular sieve tower after DEG C, now I A6 of molecular sieve tower is in running order, by program control The switching of valve control tower state, makes each two tower for one group in work>Regeneration>Blow cold>Workplace is constantly followed Ring.The clean gas of liquefaction ice chest is out gone to from molecular sieve tower bottom, needs dividing for possible entrainment to be removed through dust filter unit 5 Son sieve dust, prevents ice chest to be below blocked.So far, unstripped gas has completed purification process, becomes clean gas, and reaching will into ice chest Ask.
Amine liquid regeneration unit is from decarbonizing tower bottom amine liquid out (because rich in CO2It is referred to as rich solution), it is necessary to go regeneration.Regeneration Process is that amine liquid is heated so as in CO2The physical process for being desorbed out.Rich solution Jing CO2Discharge 20 He of gas condenser Lean solution cooler 18 obtains the heat that a part carrys out self-heating lean solution, after by entering at the top of regenerator A22 in tower, come on tower bottom Steam heating, CO therein2Steam from tower top with part moisture.Amine liquid is squeezed in regenerator B23 again by bottom of towe Jing connection pump, Continue desorption CO therein with steam counter-flow contact again2.Sequentially pass through three towers, three desorptions, CO therein2Being removed to will After below refinement degree, due to containing CO2Content is very low, is referred to as lean solution.Lean liquid temp now still has about 100 DEG C, is not suitable for straight Connect and make absorbent, it is necessary to remove CO2Discharge gas condenser 20 reclaims its heat, leaves CO2Discharge gas condenser 20, temperature is dropped to about 60 DEG C, then Jing lean solution coolers 18 are cooled to normal temperature, most after Jing lean pumps return decarbonizing tower group 4 in absorb CO2.Regenerator C24 Bottom lean solution Jing regenerator amine liquid pump out enters amine liquid storage tank 19, and all thus steam is carried all heats needed for regenerative process For.The steam heating amine liquid of 8bar produces a large amount of steam, is regenerated from bottom of towe sidepiece into three by tri- arms of house steward Jing respectively In tower, heat to declining amine liquid in tower, promote amine lyolysis therein to suck out.From three regenerators CO out2Entrainment Condensate moisture therein into liquid, is isolated moisture into knockout drum by substantial amounts of vapor, first Jing lean solution coolers 18 afterwards, CO2Discharge system, moisture are returned in system.
The lustration raw material gas that liquefaction unit comes from molecular sieve is entered in ice chest, by the cryogenic coolant (freon in ice chest And mix refrigerant) it is condensed into liquid LNG.The freon come from the pre- cold compressors of R22 9 after air-cooled exchanger 10, Total condensation is entered after R22 storage tanks, after choke valve carries out throttling cooling, as the cold of R22 precool heat exchangers device 13 into liquid phase Source, cools down to mix refrigerant and unstripped gas.The mix refrigerant come from mix refrigerant compressor 11 is through one-level Oil expeller 12, isolates mix refrigerant and compressor oil, is cooled down in respectively enteing corresponding heat exchanger, compressor oil from R22 precool heat exchangers device 13 out after, return in the pre- cold compressors of R22 9, and mix refrigerant be through air-cooled exchanger 10 Afterwards, two grades of oil expellers 14, three-level oil expeller 15, molecular sieve tower II 16, after dust filter unit 5, into precool heat exchanger are sequentially entered Device carries out precooling, and after main cold heat exchanger is further cooled down, warp knuckle stream valve carries out throttling cooling, afterwards into gas-liquid separator, Gas phase and liquid phase point two-way enter main cold heat exchanger two as low-temperature receiver, after main cold heat exchanger one, return to mix refrigerant compression In machine 11.
Unstripped gas then sequentially passes through precool heat exchanger device, after main cold heat exchanger one, into heavy hydrocarbon knockout drum, heavy hydrocarbon is isolated Come, after remaining unstripped gas enters main cold heat exchanger two, into knockout drum, wherein gas phase sequentially passes through master as flashed vapour Cold heat exchanger two, main cold heat exchanger one, after precool heat exchanger device reclaims cold, remove dewatering unit as reflux gas.Unstripped gas point Into two-way, sub-fraction was entered in cold heat exchanger as low-temperature receiver as cold air is crossed after choke valve throttling cooling, and remaining Unstripped gas passed through cold heat exchanger, and choke valve after, obtain be subcooled LNG product, in LNG storage tank.
Cooling unit is entered using R134a and the air-cooled cooling technique for combining, i.e., the R134a for coming from R134a surge tanks Enter R134a compressors 25, it is compressed after, carry out preliminary oil removing into secondary oil, condensed into condensing heat exchanger afterwards. Condensed R134a enters fluid reservoir, enters discharge Gas Cooler as cryogen and medium is cooled down, return and after warp knuckle stream Gas phase R134a return to R134 surge tanks.
Public work heat-conducting oil furnace is heated to conduction oil, and the conduction oil of heat enters reboiler, regeneration gas as thermal source Heater 26, regeneration hot-air heater 26 are heated to amine liquid and regeneration gas；Air compressor machine is carried out to air after purification compression, as The source of the gas of pneumatic control valve.
Integral mobile natural gas liquefaction device equipment composition is more and complicated, only main equipment just have 87 it It is many, wherein dynamic equipment includes R22 compressors, R134a compressors, mix refrigerant compressor, lean pump, amine liquid connection pump, sky Press, vavuum pump etc., and static equipment includes all kinds of rectifying columns, storage tank, reactor, reboiler etc..Although equipment is more, multiple It is miscellaneous, but integrated mobile liquefaction be equipped in equipment it is so many in the case of, Highgrade integration, one self-contained, convenient transport, make Natural gas liquefaction device goes on a new high degree.Complete equipment only one of which skid unit, it is long 30 meters, wide 13 meters, high 3.2 meters. Floor space is less, and the investment construction cycle is shorter, and either energy consumption or water consume all greatly reduce.The equipment is using mixed Close cold-producing medium and R22 and provide refrigerating capacity for natural gas liquefaction as cryogen, using R134a with it is air-cooled combine instead of it is traditional Water-cooling system, enables the area of anhydrous water shortage to be fast and easily possibly realized using natural gas, and basic without ground laying Pipeline can just make natural gas liquefaction.
The characteristic of Integral mobile natural gas liquefaction device of the present invention：
(1) flexibility：Can move at any time, be moved to different sources of the gas place by Automobile Transportation and produced；
(2) stability：Technical maturity reliability, Standardization instrument production；
(3) convenience：Device all completes scheduling and planning in factory, and source of the gas scene is put into operation by only needing to simple connection；
(4) space province：Single unit system floor space is little, it is only necessary to 180 square metres；
(5) economy：Investment is significantly less than the fixed factory of same production capacity, and investment reduction is up to 30%；
(6) short time limit：Device is delivered for use for 3 months, relative to fixed factory is built, shortens for about 2/3rds cycle.
It is advantageous that：
(1) device is highly intelligent and integrated；
(2) the purification technique innovated, energy consumption are lower, equipment smallerization；
(3) public work modularization, container-type control；
(4) each module is by PLC controls, PLC with communicated with host computer by ICP/IP protocol, reduce instrument wiring；
(5) perfect control program, easy to operate, stable performance；
(6) various unconventional gas comprehensive reutilizations are realized；
(7) large number of ground facility and pipeline investment are avoided using live liquefaction mode,
(8) purified treatment is carried out to unstripped gas using new type purification method, purification process is simple to operate, and energy consumption is low, is suitable for Scope is wide, can be equally applicable to various unconventional gases with suitable for various common natural air-air sources, and complicated landform makes non- The utilization rate of conventional gas is greatly promoted.

Claims (8)

1. Integral mobile natural gas liquefaction device, including de- heavy hydrocarbon unit, decarburization unit, dewatering unit, liquefaction unit, amine Liquid regeneration unit, cooling unit and public work, it is characterised in that：The natural gas liquefaction device is using removable movement and motor-driven integrative Mode assembles.
2. Integral mobile natural gas liquefaction device according to claim 1, it is characterised in that：The integrated mobile Formula natural gas liquefaction device is by de- heavy hydrocarbon unit, decarburization unit, dewatering unit, liquefaction unit, amine liquid regeneration unit, cooling unit Constitute with public work, wherein：
The de- heavy hydrocarbon unit includes active carbon purifying tower A (1) and active carbon purifying tower B (2), active carbon purifying tower A (1) and work Property carbon purifying tower B (2) be connected；
The decarburization unit includes raw material gas-liquid separator (3), decarbonizing tower group (4), dust filter unit (5) and knockout drum, raw material Gas-liquid separator (3) is connected with decarbonizing tower group (4), and the bottom of towe of decarbonizing tower group (4) is connected on dust filter unit (5), dust mistake Filter (5) is connected with knockout drum；
The dewatering unit includes molecular sieve tower I, regeneration Gas Cooler, fuel gas surge tank, and molecular sieve tower I is by I A of molecular sieve tower (6) it is composed in series with I B of molecular sieve tower (7), the tower top of I A of molecular sieve tower (6) and I B of molecular sieve tower (7) is sequentially connected regeneration air cooling But device, is regenerated Gas Cooler and is connected with fuel gas surge tank；The bottom of towe of I A of molecular sieve tower (6) and I B of molecular sieve tower (7) is connected to On dust filter unit (5) in decarburization unit；
The liquefaction unit includes ice chest (8), the pre- cold compressors of R22 (9), air-cooled exchanger (10), R22 storage tanks, hybrid refrigeration Agent compressor (11), one-level oil expeller (12), R22 precool heat exchanger devices (13), two grades of oil expellers (14), three-level oil expeller (15), Molecular sieve tower II (16), LNG storage tank, ice chest (8) are connected with the molecular sieve tower I in dewatering unit, the pre- cold compressors of R22 (9) with R22 precool heat exchanger devices (13) is connected, and R22 precool heat exchanger devices (13) is connected with R22 storage tanks；Mix refrigerant compressor (11) is successively It is connected to one-level oil expeller (12), air-cooled exchanger (10), two grades of oil expellers (14), three-level oil expeller (15), molecular sieve towers II (16) on the dust filter unit (5) and in decarburization unit；LNG storage tank is connected with ice chest (8)；
The amine liquid regeneration unit includes regenerator, amine liquid filter (17), lean solution cooler (18), lean pump, amine liquid storage tank (19), reboiler, CO2Discharge gas condenser (20), discharge gas-liquid separator (21), regenerator are connected to de- in decarburization unit Carbon tower bottom of towe, amine liquid filter (17) are connected with regenerator, lean solution cooler (18), lean solution cooler (18) and lean pump phase Even；Amine liquid storage tank (19) is connected to the bottom of regenerator, and the bottom of amine liquid storage tank (19) is connected with reboiler；CO2Discharge gas Condenser (20) is connected with regenerator, discharge gas-liquid separator (21)；
The cooling unit includes R134a surge tanks, R134a compressors (25), condensing heat exchanger, fluid reservoir, discharge air cooling Device, R134a surge tanks are connected with R134a compressors (25), and R134a compressors (25) are connected with condensing heat exchanger, condensing heat-exchange Device is connected on fluid reservoir；Fluid reservoir is connected with discharge Gas Cooler；
The public work includes heat-conducting oil furnace, regeneration hot-air heater (26), air compressor machine, and heat-conducting oil furnace is single with the regeneration of amine liquid successively Reboiler, regeneration hot-air heater (26) connection in unit；Air compressor machine is carried out after purification compression, as pneumatic control valve to air Source of the gas.
3. Integral mobile natural gas liquefaction device according to claim 2, it is characterised in that：The decarbonizing tower group (4) it is composed in series by several decarbonizing towers.
4. Integral mobile natural gas liquefaction device according to claim 2, it is characterised in that：Ice chest (8) bag Include precool heat exchanger device, main cold heat exchanger one, main cold heat exchanger two and cross cold heat exchanger, precool heat exchanger device, main cold heat exchanger one, master Cold heat exchanger two is arranged in the casing of sealing with cold heat exchanger is crossed, and its gap filling pearlife carries out cold insulation.
5. Integral mobile natural gas liquefaction device according to claim 4, it is characterised in that：The precool heat exchanger device It is connected on heavy hydrocarbon knockout drum with one one end of main cold heat exchanger, two one end of main cold heat exchanger is connected on knockout drum, Main cold heat exchanger two, main cold heat exchanger one, the other end of precool heat exchanger device are connected in dewatering unit；Cross cold heat exchanger to be connected to In LNG storage tank.
6. Integral mobile natural gas liquefaction device according to claim 2, it is characterised in that：The regenerator is by again Raw tower A (22), regenerator B (23), regenerator C (24) are in series.
7. the Integral mobile natural gas liquefaction device according to any claim in claim 1 to 6, its feature exist In：The Integral mobile natural gas liquefaction device is to adopt cryogenic coolant and R22 to provide for natural gas liquefaction as cryogen Refrigerating capacity, carries out natural gas liquefaction with the air-cooled water-cooling system for combining using R134a.
8. Integral mobile natural gas liquefaction device according to claim 7, it is characterised in that：The cryogenic coolant is adopted With freon and mix refrigerant.
CN201610960718.4A 2016-10-28 2016-10-28 Integrated mobile natural gas liquefaction device Active CN106524666B (en)

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