US20140318177A1 - Integration of a liquefied natural gas liquefier with the production of liquefied natural gas - Google Patents
Integration of a liquefied natural gas liquefier with the production of liquefied natural gas Download PDFInfo
- Publication number
- US20140318177A1 US20140318177A1 US14/327,739 US201414327739A US2014318177A1 US 20140318177 A1 US20140318177 A1 US 20140318177A1 US 201414327739 A US201414327739 A US 201414327739A US 2014318177 A1 US2014318177 A1 US 2014318177A1
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- US
- United States
- Prior art keywords
- methane
- nitrogen
- feeding
- heat exchanger
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 230000010354 integration Effects 0.000 title description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 194
- 239000007789 gas Substances 0.000 claims abstract description 85
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 80
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 39
- 238000004821 distillation Methods 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000003507 refrigerant Substances 0.000 claims description 18
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 239000003345 natural gas Substances 0.000 abstract description 12
- 229910001873 dinitrogen Inorganic materials 0.000 abstract description 3
- 238000001179 sorption measurement Methods 0.000 description 51
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 43
- 229910002092 carbon dioxide Inorganic materials 0.000 description 22
- 239000001569 carbon dioxide Substances 0.000 description 21
- 239000003463 adsorbent Substances 0.000 description 18
- 239000000356 contaminant Substances 0.000 description 15
- 238000010926 purge Methods 0.000 description 12
- 238000000746 purification Methods 0.000 description 11
- 239000007800 oxidant agent Substances 0.000 description 9
- 239000002912 waste gas Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 229910001868 water Inorganic materials 0.000 description 9
- 239000012535 impurity Substances 0.000 description 8
- 238000003860 storage Methods 0.000 description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 238000011084 recovery Methods 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 239000000446 fuel Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 230000008929 regeneration Effects 0.000 description 6
- 238000011069 regeneration method Methods 0.000 description 6
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 description 4
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 150000003464 sulfur compounds Chemical class 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 3
- -1 methane organic compounds Chemical class 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical class CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical class CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 150000002829 nitrogen Chemical class 0.000 description 1
- 238000004172 nitrogen cycle Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
- F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—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
- F25J1/0212—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 single flow MCR cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—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
- F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
- F25J1/0291—Refrigerant compression by combined gas compression and liquid pumping
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- 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
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
- F25J3/0209—Natural gas or substitute natural gas
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- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
- F25J3/0233—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 1 carbon atom or more
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- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
- F25J3/0257—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of nitrogen
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- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/02—Processes or apparatus using separation by rectification in a single pressure main column system
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- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/70—Refluxing the column with a condensed part of the feed stream, i.e. fractionator top is stripped or self-rectified
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- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
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- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
- F25J2205/66—Regenerating the adsorption vessel, e.g. kind of reactivation gas
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- F25J2210/00—Processes characterised by the type or other details of the feed stream
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- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
- F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
- F25J2220/62—Separating low boiling components, e.g. He, H2, N2, Air
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- F25J2290/32—Details on header or distribution passages of heat exchangers, e.g. of reboiler-condenser or plate heat exchangers
Definitions
- the invention is the integration of a liquefied natural gas (LNG) liquefier system with the production of LNG from biogas or landfill gas.
- LNG liquefied natural gas
- Alternative fuels derived from such sources include liquefied natural gas, liquid to compressed natural gas (LCNG), small-scale hydrogen production form low-grade natural gas and pipeline injection of compressed, purified natural gas.
- the primary natural gas sources of interest are landfill gas and biogas, particularly digester gas, wastewater treatment off-gas, coal seam methane as well as other opportunistic biogas sources.
- Renewable methane can be recovered from a number of sources, such as anaerobic digestion of municipal or industrial waste streams, the degradation of biomass in landfills, the gasification of waste and biomass streams, amongst others. In many instances, this renewable methane require purification before it can be used and/or sold into higher valued markets, such as injection into the pipeline grid, as a feedstock for liquefied natural gas, as a vehicle fuel, or as a feedstock for the production of hydrogen. Further, the energy that is required to purify the renewable methane is significant.
- biogas/landfill gas is both capital and power intensive because it contains a large number of trace and bulk contaminants in fairly large concentrations.
- Various methods are employed to remove these including chilling, cryogenic methods and various adsorption and scrubbing processes. However, these processes can be expensive in both capital and operating costs and it is important to minimize these costs to achieve an economically viable process.
- a typical process for the purification of the methane from biogas/landfill gas requires several steps. Sulfur removal is generally followed by drying by removing water. The dried gas stream is then treated for contaminants such a volatile organic compounds by processes such as adsorption, CO 2 washing or by cryogenic methods. The stream is then treated for bulk carbon dioxide removal by a membrane or adsorption process and then is treated for removal of nitrogen. All these purification steps are necessary before the biogas/landfill gas can be liquefied and stored in anticipation of being dispensed, or directed towards other uses, such as pipeline injection, energy production with fuel cells or small-scale hydrogen production. LNG production is particularly challenging since all condensable contaminants including carbon dioxide must be removed to low ppm levels.
- Inert compounds which can include non-condensable compounds such as hydrogen may be found in landfill gas and other sources of methane. The presence of these compounds makes traditional liquefaction techniques without their removal more difficult and will increase the power costs of the liquefaction process.
- the inventive method provides advantages over other systems such as molecular gate and vacuum swing adsorption systems when hydrogen is present. Molecular gate and vacuum swing adsorption processes do not remove hydrogen so liquefaction systems that depend on these methods for the removal of inert compounds will have additional concerns over increased power consumption.
- the invention provides for using purified landfill or biogas to make combinations of liquefied natural gas, liquid to compressed natural gas, renewable hydrogen or renewable natural gas for pipeline injection.
- a liquefier is integrated with a thermosyphon reboiler distillation column, which may be a packed column, for inert gas such as nitrogen removal for small-scale liquefied biogas production. Additionally, excess oxygen may be removed from a methane rich stream.
- the invention may be employed in a variety of liquefaction methods including but not limited to cascade cycles, single stage mixed refrigerant cycles with and without propane/ammonia pre-cooling, multi-stage mixed refrigerant cycles and nitrogen cycles with and without expanders.
- a method for purifying a methane-containing gas comprising the steps of:
- the methane-containing gas is typically biogas or landfill gas but may be other gas mixtures that are predominantly methane in content.
- the methane-containing gas may be compressed and fed to a separator to remove condensates and particles prior to entering the first pressure swing adsorption unit.
- the contaminants that are typically removed by the first pressure swing adsorption unit are selected from the group consisting of hydrogen sulfide, water, non-methane organic compounds (NMOCs) and carbon dioxide.
- the first pressure swing adsorption unit will contain adsorbents to remove these contaminants.
- the contaminants that are separated out in the first pressure swing adsorption unit will be destroyed in a thermal oxidizer.
- the methane-containing gas recovered from the first pressure swing adsorption unit is fed to a guard bed but a portion may be diverted back to the line feeding the methane-containing into the first pressure swing adsorption unit or the feed line entering the thermal oxidizer.
- the guard bed will remove trace contaminants selected from the group consisting of halogenated compounds such as vinyl chloride; volatile sulfur compounds such as carbonyl sulfide (COS) carbon disulfide and mercaptans; volatile oxygenates such as dimethyl ether, alcohols and ketones; aromatic hydrocarbon containing compounds such as benzene; volatile hydrocarbons such as hexanes, pentanes, butane, etc.; siloxanes and mercury from the methane-containing gas.
- COS carbonyl sulfide
- COS carbonyl sulfide
- mercaptans volatile oxygenates
- aromatic hydrocarbon containing compounds such as benzene
- volatile hydrocarbons such as hexanes, pentanes, butane, etc.
- siloxanes and mercury from the methane-containing gas.
- Carbon dioxide that is separated out in the various separation processes may be employed to purge the adsorbent beds in the first pressure swing adsorption unit.
- carbon dioxide from the second pressure swing adsorption unit may be used to purge the adsorbent beds in the first pressure swing adsorption unit.
- the nitrogen from the distillation column may be used to purge the adsorbent beds in the second pressure swing adsorption unit.
- purified natural gas containing mainly methane, nitrogen and small amounts of oxygen at between 6 and 15 bar from a landfill or other source of methane-containing gas is fed to the top of a main heat exchanger and cooled down to about ⁇ 145° C.
- the cooled down natural gas is fed to the reboiler part of a distillation column where it will exchange heat with product liquefied natural gas present in the reboiler and lowering its temperature to about ⁇ 155° C.
- This methane is then fed via a Joule-Thomsen valve to the top of the packed distillation column where the reboiler resides.
- the packed distillation column does not have a condenser.
- the nitrogen rich gas will rise to the top of the packed distillation column while the methane rich liquid is removed from the bottom.
- the nitrogen-rich gas waste gas stream from the top of the column is directed to the main heat exchanger where its cold is recovered before being fed to a cleanup system for purifying the nitrogen gas.
- the product liquefied natural gas is pumped from the bottom of the packed distillation column to vacuum-insulated tanks kept at between 1 and 5 barg.
- a cryogenic pump is used to transport the liquefied natural gas to the storage tanks.
- the purified liquefied natural gas is then available as a fuel for example for heavy-duty trucks, refuse vehicles, buses and other fleet vehicles.
- This integration of the separation systems allows the overall system great efficiency by lowering net power consumption over typical pressure swing adsorption nitrogen recovery units.
- the integration eliminates the need for a vacuum pump and recycle compressors which are also typical of pressure swing adsorption nitrogen recovery units thus lowering capital cost for plant construction.
- the invention may have applicability to other methane sources such as bio-digesters and other opportunistic sources of methane.
- FIG. 1 a is a schematic of an integrated biogas/landfill gas purification system.
- FIG. 1 b is a schematic of an integrated biogas/landfill gas purification system.
- FIG. 2 is a schematic of an integrated mixed refrigerant liquefied natural gas liquefier with a reboiler column for nitrogen removal.
- FIG. 3 is a schematic of an integrated mixed refrigerant liquefied natural gas liquefier with a reboiler column for nitrogen removal.
- FIG. 4 is a schematic of a packed distillation column as used in the invention.
- FIG. 1 a is a schematic of a fully integrated biogas/landfill gas purification system according to the invention.
- Line 1 feeds a biogas or liquefied fuel gas into a feed compressor A which will pressurize the feed gas for entry into the purification system.
- the compressed feed gas will enter an after-cooler B through line 2 and be fed to a separator C where liquid condensate will be separated from the feed gas stream through line 3 as well as heavier volatile organic compounds (VOCs), dust and other particles.
- the feed gas stream will leave the separator C through line 4 and be fed to the first pressure swing adsorption unit D.
- VOCs volatile organic compounds
- the feed gas stream will be separated in the first pressure swing adsorption unit D into a methane gas stream and a stream containing by-products such as hydrogen sulfide, water, carbon dioxide NMOCs and some methane.
- the pressure swing adsorption unit D contains an adsorbent or adsorbents capable of separating methane from the impurities present in the biogas/landfill feed gas. These may be molecular sieves, Clinoptolites and aluminas which may be mixed or layered into individual beds.
- the by-product gas stream will be fed through line 5 to a blower E to a thermal oxidizer F. Air may be inputted into line 5 through line 5 A prior to entry into the thermal oxidizer F.
- Makeup biogas or landfill gas through line 1 may also be fed into line 5 through line 7 and valve V 1 .
- a portion of the feed gas stream collected from the pressure swing adsorption unit D is fed through line 6 to a DEP recycle unit L and returned to the feed gas line 1 through line 6 A for reentry into the feed compressor A.
- thermal oxidizer F hydrogen sulfide, water, carbon dioxide, non-methane organic compounds (NMOCs) and some methane are destroyed and the relatively benign gas stream is vented through line 8 .
- NMOCs non-methane organic compounds
- Some of the oxidized components are fed through line 11 to a temperature swing adsorption heater J where they provide heat to the heater before being vented through line 12 .
- the methane that is recovered from the first pressure swing adsorption unit D is fed through line 8 A to guard bed G. In the guard bed G, any additional impurities that may be present along with the methane are separated out.
- the methane now of greater purity is fed through line 9 to economizer K before entering the temperature swing adsorption unit H.
- the temperature swing adsorption unit H will separate methane from other impurities, notably carbon dioxide.
- the temperature swing adsorption unit H will contain adsorbent materials capable of separating these components. These adsorbent materials are typically mixed or in layered beds.
- the carbon dioxide that is separated will exit the temperature swing adsorption unit H through line 10 and through blower I will be fed back to the pressure swing adsorption unit D where the carbon dioxide will be used to purge the adsorbent bed during the purge and regeneration steps of the pressure swing adsorption cycle.
- the methane is recovered from the temperature swing adsorption unit and fed through line 14 to economizer K where it will be fed to the liquefier feed (not shown) through line 15 .
- the waste gas stream from a gas separation column (not shown) is fed through line 13 through a temperature swing adsorption heater 13 where it will gain heat and be used during the purge and regeneration steps to purge the adsorbent materials in the temperature swing adsorption unit H.
- FIG. 1 b there is described a fully integrated biogas/landfill gas purification system that uses two pressure swing adsorption beds in the system.
- the biogas/landfill gas feed stream is fed through line 20 to feed compressor M which provides the feed gas to an after-cooler N through line 21 and feed to a separator O where water condensate and other contaminants such as heavier VOCs, dust and particles are removed through line 22 from the feed gas stream.
- the purified feed gas stream is fed from the separator O to the first pressure swing adsorption unit P.
- the pressure swing adsorption unit P contains an adsorbent or adsorbents that are capable of separating methane from other impurities present in the feed gas stream. These adsorbents can be for example, molecular sieves, Clinoptilites and aluminas which can be mixed or layered into individual beds.
- the contaminants separated from the methane leave the first pressure swing adsorption unit P through line 24 and aided by blower Q are fed into thermal oxidizer S. Air may also be fed to line 24 prior to the contaminants entry into the thermal oxidizer S. Some of the contaminants are withdrawn through line 26 and are fed through DEP recycle R back to the feed gas stream 20 prior to entering the feed compressor M.
- the thermal oxidizer S impurities such as hydrogen sulfide, water, carbon dioxide, NMOCs with some methane are destroyed.
- the waste gas stream is vented through line 27 .
- a portion of the waste gas stream is fed through line 28 to a waste heat trim heater U which will recover some heat from the waste gas stream before it is fed back into line 27 for venting.
- the purified methane is fed through line 29 to guard bed T. In this guard bed, additional impurities that may still be present in the methane are separated out.
- the purified methane leaves the guard bed T through line 30 and passes through economizer Y where it will adsorb some heat.
- Line 30 further passes through the waste heat trim heater U where the purified methane will adsorb more heat before entering the second pressure swing adsorption unit V which will operate to separate out carbon dioxide present with the methane.
- the second pressure swing adsorption unit V will contain adsorbent materials that are capable of separating methane from carbon dioxide plus any remaining impurities present with the methane. These adsorbents are mixed or in individual layered beds and comprise MG sieve or 13 ⁇ zeolite sieve material. The separated impurities carbon dioxide, nitrogen, oxygen and some methane are fed through line 34 to vacuum pump W where they are fed back to the first pressure swing adsorption unit P to assist in purging the adsorbent bed during the purge and regeneration steps of the pressure swing adsorption cycle.
- the methane that is separated is fed through line 33 to an economizer where it will be recovered as liquefied natural gas which may be stored or fed to other unit operations as a fuel stock.
- a portion of the methane recovered is fed through a DEP recycle compressor X through line 35 where it is fed to line 30 to increase the methane concentration of the stream containing methane and carbon dioxide that will enter the second pressure swing adsorption unit V.
- a waste gas stream from a gas separation column (not shown) is fed through line 32 to the second pressure swing adsorption unit V where it will be used during the purge and regeneration steps to purge the adsorbent materials in the second pressure swing adsorption unit V.
- Landfill gas was purified and all water, sulfur compounds, NMOCs and carbon dioxide were removed by the pre-purification process shown in FIGS. 1 a and 1 b above.
- the purified gas stream that was fed to the liquefier contained primarily methane, nitrogen and oxygen and had the following composition in Table 1.
- FIG. 2 is a schematic of an integrated mixed refrigerant liquefied natural gas liquefier with a reboiler column for nitrogen removal.
- Clean biogas as liquefier feed is fed through line 40 where it passes through the main heat exchanger AA.
- the warmer biogas will enter through open valve V 7 a distillation column with reboiler AB where it will be subjected to distillation.
- the natural gas is recovered through the bottom of the column and heat exchanger through line 41 where it will be fed to a storage tank AC.
- the stored liquefied natural gas may be recovered through open valve V 2 and line 41 A.
- liquefied natural gas is vented from storage tank AC through line 42 as natural gas.
- This vented natural gas will join with the gas stream coming off the top of the distillation column with reboiler AB.
- This waste gas stream is primarily nitrogen and is fed through the main heat exchanger AA to exchange its colder temperature before being recovered as a waste gas steam for regeneration of adsorption beds or for use in power generation.
- a separator AD provides mixed refrigerant to the main heat exchanger AA through line 44 where is will be cooled and fed through line 45 to inlet separator AE.
- the inlet separator separates the eventual mixed refrigerant liquid residual from cold box outlet to avoid liquid at compressor suction and feeds through line 46 to a refrigerant compressor AF.
- the resulting mixed refrigerant is fed through line 47 to a coalescing filter AG where assist in oil droplet removal from the mixed refrigerant.
- the mixed refrigerant free of the oil droplets is fed through line 48 to a cooler AH where the cooled mixed refrigerant is fed through line 49 to a separator AI.
- the bottoms from the separator AI are fed through line 4541 and open valve V 4 through a pump AJ and line 52 where it will join line 50 in the main heat exchanger AA. A portion of the bottoms is fed through line 54 and open valve V 5 back to the separator AI.
- the tops from the separator AI are fed through line 50 back through the main heat exchanger AA.
- a line 53 and open valve V 3 will bypass a portion of the hot gas back to line 45 t before entering inlet separator AE.
- Line 50 which contains the nitrogen from the top of separator AI will collect heat from the main heat exchanger AA and after passing through open valve V 6 enter separator AD before entering the main heat exchanger AA through line 44 to cool down.
- FIG. 3 the same legends and numbers are used as were used to describe FIG. 2 except for the inclusion of a pump between the distillation column with reboiler AB and storage tank AC.
- the pump AK is employed to assist removing liquefied natural gas from the bottom of the distillation column with reboiler AB through line 60 and directing through line 61 the liquefied natural gas into the storage tank AC.
- FIG. 4 describes in greater detail the distillation column with reboiler as detailed in FIGS. 2 and 3 .
- the numbering system as used for FIG. 3 is also employed in describing FIG. 4 .
- the packed distillation column with reboiler AB receives the biogas or landfill gas from a liquefier (not shown) through line 40 . This feed gas stream will pass some heat to the reboiler portion of the distillation column and reboiler AB before passing through a Joule-Thomson valve and entering the top of the packed distillation column and reboiler AB.
- the distillation column and reboiler AB is packed with the appropriate packing or plates to separate nitrogen from the methane.
- the nitrogen gas will be vented from the top of the packed distillation column and reboiler AB through line 43 and fed back to the main heat exchanger AA referred to in FIG. 3 to provide some cold to the main heat exchanger AA.
- the liquefied natural gas is recovered through the reboiler portion of the distillation column and reboiler through line 60 and optional cryogenic pump AK to line 61 for delivery to the storage tank AC as depicted in the description of FIG. 3 .
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Abstract
A method for integrating a liquefied natural gas liquefier system with production of liquefied natural gas from a methane-containing gas stream. The liquefied natural gas is produced by feeding a methane-containing gas stream through a heat exchanger to a distillation column and liquefying the natural gas while capturing the gaseous nitrogen. The liquefied natural gas is captured and the nitrogen gas is recovered, fed through the heat exchanger to recover cold.
Description
- This application claims priority from U.S. patent application Ser. No. 13/626,133 filed Sep. 25, 2012 and U.S. Provisional Patent Application Ser. No. 61/543,863 filed Oct. 6, 2011.
- The invention is the integration of a liquefied natural gas (LNG) liquefier system with the production of LNG from biogas or landfill gas.
- Production of alternative fuels from low-grade methane opportunity sources, such as biogas and landfill gas, is challenging but has great value. Alternative fuels derived from such sources include liquefied natural gas, liquid to compressed natural gas (LCNG), small-scale hydrogen production form low-grade natural gas and pipeline injection of compressed, purified natural gas. The primary natural gas sources of interest are landfill gas and biogas, particularly digester gas, wastewater treatment off-gas, coal seam methane as well as other opportunistic biogas sources.
- Renewable methane can be recovered from a number of sources, such as anaerobic digestion of municipal or industrial waste streams, the degradation of biomass in landfills, the gasification of waste and biomass streams, amongst others. In many instances, this renewable methane require purification before it can be used and/or sold into higher valued markets, such as injection into the pipeline grid, as a feedstock for liquefied natural gas, as a vehicle fuel, or as a feedstock for the production of hydrogen. Further, the energy that is required to purify the renewable methane is significant.
- The cleanup of biogas/landfill gas is both capital and power intensive because it contains a large number of trace and bulk contaminants in fairly large concentrations. Various methods are employed to remove these including chilling, cryogenic methods and various adsorption and scrubbing processes. However, these processes can be expensive in both capital and operating costs and it is important to minimize these costs to achieve an economically viable process.
- A typical process for the purification of the methane from biogas/landfill gas requires several steps. Sulfur removal is generally followed by drying by removing water. The dried gas stream is then treated for contaminants such a volatile organic compounds by processes such as adsorption, CO2 washing or by cryogenic methods. The stream is then treated for bulk carbon dioxide removal by a membrane or adsorption process and then is treated for removal of nitrogen. All these purification steps are necessary before the biogas/landfill gas can be liquefied and stored in anticipation of being dispensed, or directed towards other uses, such as pipeline injection, energy production with fuel cells or small-scale hydrogen production. LNG production is particularly challenging since all condensable contaminants including carbon dioxide must be removed to low ppm levels.
- Inert compounds which can include non-condensable compounds such as hydrogen may be found in landfill gas and other sources of methane. The presence of these compounds makes traditional liquefaction techniques without their removal more difficult and will increase the power costs of the liquefaction process. The inventive method provides advantages over other systems such as molecular gate and vacuum swing adsorption systems when hydrogen is present. Molecular gate and vacuum swing adsorption processes do not remove hydrogen so liquefaction systems that depend on these methods for the removal of inert compounds will have additional concerns over increased power consumption.
- The invention provides for using purified landfill or biogas to make combinations of liquefied natural gas, liquid to compressed natural gas, renewable hydrogen or renewable natural gas for pipeline injection. A liquefier is integrated with a thermosyphon reboiler distillation column, which may be a packed column, for inert gas such as nitrogen removal for small-scale liquefied biogas production. Additionally, excess oxygen may be removed from a methane rich stream.
- The invention may be employed in a variety of liquefaction methods including but not limited to cascade cycles, single stage mixed refrigerant cycles with and without propane/ammonia pre-cooling, multi-stage mixed refrigerant cycles and nitrogen cycles with and without expanders.
- In one embodiment of the invention, there is disclosed a method for purifying a methane-containing gas comprising the steps of:
- a) feeding a feedstream of methane-containing gas to a first pressure swing adsorption unit to remove contaminants from the biogas or landfill gas;
b) feeding the methane-containing gas to a guard bed wherein further contaminants are removed from the methane-containing gas;
c) feeding the methane-containing gas to a temperature swing adsorption unit to remove carbon dioxide; and
d) recovering purified biogas or landfill gas. - In a further embodiment of the invention, there is disclosed a method for purifying a methane-containing gas comprising the steps of:
- a) feeding a feedstream of methane-containing gas to a first pressure swing adsorption unit to remove contaminants from the methane-containing gas;
b) feeding the methane-containing gas to a guard bed wherein further contaminants are removed from the methane-containing gas;
c) feeding the methane-containing gas to a second pressure swing adsorption unit to remove carbon dioxide; and
d) recovering purified methane-containing gas. - The methane-containing gas is typically biogas or landfill gas but may be other gas mixtures that are predominantly methane in content. The methane-containing gas may be compressed and fed to a separator to remove condensates and particles prior to entering the first pressure swing adsorption unit. The contaminants that are typically removed by the first pressure swing adsorption unit are selected from the group consisting of hydrogen sulfide, water, non-methane organic compounds (NMOCs) and carbon dioxide. The first pressure swing adsorption unit will contain adsorbents to remove these contaminants. The contaminants that are separated out in the first pressure swing adsorption unit will be destroyed in a thermal oxidizer.
- The methane-containing gas recovered from the first pressure swing adsorption unit is fed to a guard bed but a portion may be diverted back to the line feeding the methane-containing into the first pressure swing adsorption unit or the feed line entering the thermal oxidizer.
- The guard bed will remove trace contaminants selected from the group consisting of halogenated compounds such as vinyl chloride; volatile sulfur compounds such as carbonyl sulfide (COS) carbon disulfide and mercaptans; volatile oxygenates such as dimethyl ether, alcohols and ketones; aromatic hydrocarbon containing compounds such as benzene; volatile hydrocarbons such as hexanes, pentanes, butane, etc.; siloxanes and mercury from the methane-containing gas. Carbon dioxide that is separated out in the various separation processes may be employed to purge the adsorbent beds in the first pressure swing adsorption unit. Nitrogen from the distillation column may be used to purge the adsorbent beds in the temperature swing adsorption unit. This nitrogen may be heated by vent gas from the thermal oxidizer prior to it entering the temperature swing adsorption unit.
- In the embodiment that employs a first and a second pressure swing adsorption unit, carbon dioxide from the second pressure swing adsorption unit may be used to purge the adsorbent beds in the first pressure swing adsorption unit. The nitrogen from the distillation column may be used to purge the adsorbent beds in the second pressure swing adsorption unit.
- In a further embodiment of the invention, there is disclosed a method for producing liquefied natural gas comprising the steps of:
- a) feeding a methane-containing gas stream to a heat exchanger, wherein the methane-containing gas stream will be cooled by the heat exchanger;
b) feeding the methane-containing gas to a reboiler of a distillation column, wherein the distillation column can be packed or contain sieve trays;
c) feeding the methane containing gas to a valve where part of the methane containing gas is vaporized and its temperature is decreased due to Joule Thompson effect;
d) feeding the methane containing gas to the top of a packed distillation column:
e) removing methane from the bottom of the packed distillation column as liquefied natural gas;
f) recovering nitrogen; and
g) feeding the recovered nitrogen through the heat exchanger. - In typical operation, purified natural gas containing mainly methane, nitrogen and small amounts of oxygen at between 6 and 15 bar from a landfill or other source of methane-containing gas is fed to the top of a main heat exchanger and cooled down to about −145° C. The cooled down natural gas is fed to the reboiler part of a distillation column where it will exchange heat with product liquefied natural gas present in the reboiler and lowering its temperature to about −155° C. This methane is then fed via a Joule-Thomsen valve to the top of the packed distillation column where the reboiler resides. Typically the packed distillation column does not have a condenser. The nitrogen rich gas will rise to the top of the packed distillation column while the methane rich liquid is removed from the bottom.
- The nitrogen-rich gas waste gas stream from the top of the column is directed to the main heat exchanger where its cold is recovered before being fed to a cleanup system for purifying the nitrogen gas. The product liquefied natural gas is pumped from the bottom of the packed distillation column to vacuum-insulated tanks kept at between 1 and 5 barg. A cryogenic pump is used to transport the liquefied natural gas to the storage tanks. The purified liquefied natural gas is then available as a fuel for example for heavy-duty trucks, refuse vehicles, buses and other fleet vehicles.
- This integration of the separation systems allows the overall system great efficiency by lowering net power consumption over typical pressure swing adsorption nitrogen recovery units. The integration eliminates the need for a vacuum pump and recycle compressors which are also typical of pressure swing adsorption nitrogen recovery units thus lowering capital cost for plant construction. Indeed, the invention may have applicability to other methane sources such as bio-digesters and other opportunistic sources of methane.
-
FIG. 1 a is a schematic of an integrated biogas/landfill gas purification system. -
FIG. 1 b is a schematic of an integrated biogas/landfill gas purification system. -
FIG. 2 is a schematic of an integrated mixed refrigerant liquefied natural gas liquefier with a reboiler column for nitrogen removal. -
FIG. 3 is a schematic of an integrated mixed refrigerant liquefied natural gas liquefier with a reboiler column for nitrogen removal. -
FIG. 4 is a schematic of a packed distillation column as used in the invention. -
FIG. 1 a is a schematic of a fully integrated biogas/landfill gas purification system according to the invention.Line 1 feeds a biogas or liquefied fuel gas into a feed compressor A which will pressurize the feed gas for entry into the purification system. The compressed feed gas will enter an after-cooler B throughline 2 and be fed to a separator C where liquid condensate will be separated from the feed gas stream through line 3 as well as heavier volatile organic compounds (VOCs), dust and other particles. The feed gas stream will leave the separator C through line 4 and be fed to the first pressure swing adsorption unit D. - The feed gas stream will be separated in the first pressure swing adsorption unit D into a methane gas stream and a stream containing by-products such as hydrogen sulfide, water, carbon dioxide NMOCs and some methane. The pressure swing adsorption unit D contains an adsorbent or adsorbents capable of separating methane from the impurities present in the biogas/landfill feed gas. These may be molecular sieves, Clinoptolites and aluminas which may be mixed or layered into individual beds. The by-product gas stream will be fed through line 5 to a blower E to a thermal oxidizer F. Air may be inputted into line 5 through line 5A prior to entry into the thermal oxidizer F. Makeup biogas or landfill gas through
line 1 may also be fed into line 5 through line 7 and valve V1. A portion of the feed gas stream collected from the pressure swing adsorption unit D is fed throughline 6 to a DEP recycle unit L and returned to thefeed gas line 1 through line 6A for reentry into the feed compressor A. - In the thermal oxidizer F, hydrogen sulfide, water, carbon dioxide, non-methane organic compounds (NMOCs) and some methane are destroyed and the relatively benign gas stream is vented through
line 8. Some of the oxidized components are fed throughline 11 to a temperature swing adsorption heater J where they provide heat to the heater before being vented throughline 12. - The methane that is recovered from the first pressure swing adsorption unit D is fed through line 8A to guard bed G. In the guard bed G, any additional impurities that may be present along with the methane are separated out. The methane now of greater purity is fed through
line 9 to economizer K before entering the temperature swing adsorption unit H. The temperature swing adsorption unit H will separate methane from other impurities, notably carbon dioxide. The temperature swing adsorption unit H will contain adsorbent materials capable of separating these components. These adsorbent materials are typically mixed or in layered beds. The carbon dioxide that is separated will exit the temperature swing adsorption unit H throughline 10 and through blower I will be fed back to the pressure swing adsorption unit D where the carbon dioxide will be used to purge the adsorbent bed during the purge and regeneration steps of the pressure swing adsorption cycle. - The methane is recovered from the temperature swing adsorption unit and fed through line 14 to economizer K where it will be fed to the liquefier feed (not shown) through
line 15. - The waste gas stream from a gas separation column (not shown) is fed through
line 13 through a temperatureswing adsorption heater 13 where it will gain heat and be used during the purge and regeneration steps to purge the adsorbent materials in the temperature swing adsorption unit H. - Turning to
FIG. 1 b, there is described a fully integrated biogas/landfill gas purification system that uses two pressure swing adsorption beds in the system. The biogas/landfill gas feed stream is fed throughline 20 to feed compressor M which provides the feed gas to an after-cooler N through line 21 and feed to a separator O where water condensate and other contaminants such as heavier VOCs, dust and particles are removed throughline 22 from the feed gas stream. - The purified feed gas stream is fed from the separator O to the first pressure swing adsorption unit P. The pressure swing adsorption unit P contains an adsorbent or adsorbents that are capable of separating methane from other impurities present in the feed gas stream. These adsorbents can be for example, molecular sieves, Clinoptilites and aluminas which can be mixed or layered into individual beds. The contaminants separated from the methane leave the first pressure swing adsorption unit P through
line 24 and aided by blower Q are fed into thermal oxidizer S. Air may also be fed toline 24 prior to the contaminants entry into the thermal oxidizer S. Some of the contaminants are withdrawn throughline 26 and are fed through DEP recycle R back to thefeed gas stream 20 prior to entering the feed compressor M. - In the thermal oxidizer S, impurities such as hydrogen sulfide, water, carbon dioxide, NMOCs with some methane are destroyed. The waste gas stream is vented through
line 27. A portion of the waste gas stream is fed throughline 28 to a waste heat trim heater U which will recover some heat from the waste gas stream before it is fed back intoline 27 for venting. - The purified methane is fed through line 29 to guard bed T. In this guard bed, additional impurities that may still be present in the methane are separated out. The purified methane leaves the guard bed T through line 30 and passes through economizer Y where it will adsorb some heat. Line 30 further passes through the waste heat trim heater U where the purified methane will adsorb more heat before entering the second pressure swing adsorption unit V which will operate to separate out carbon dioxide present with the methane.
- The second pressure swing adsorption unit V will contain adsorbent materials that are capable of separating methane from carbon dioxide plus any remaining impurities present with the methane. These adsorbents are mixed or in individual layered beds and comprise MG sieve or 13× zeolite sieve material. The separated impurities carbon dioxide, nitrogen, oxygen and some methane are fed through
line 34 to vacuum pump W where they are fed back to the first pressure swing adsorption unit P to assist in purging the adsorbent bed during the purge and regeneration steps of the pressure swing adsorption cycle. - The methane that is separated is fed through
line 33 to an economizer where it will be recovered as liquefied natural gas which may be stored or fed to other unit operations as a fuel stock. A portion of the methane recovered is fed through a DEP recycle compressor X throughline 35 where it is fed to line 30 to increase the methane concentration of the stream containing methane and carbon dioxide that will enter the second pressure swing adsorption unit V. - A waste gas stream from a gas separation column (not shown) is fed through
line 32 to the second pressure swing adsorption unit V where it will be used during the purge and regeneration steps to purge the adsorbent materials in the second pressure swing adsorption unit V. - Landfill gas was purified and all water, sulfur compounds, NMOCs and carbon dioxide were removed by the pre-purification process shown in
FIGS. 1 a and 1 b above. The purified gas stream that was fed to the liquefier contained primarily methane, nitrogen and oxygen and had the following composition in Table 1. -
TABLE 1 Specie Mole Fraction Carbon dioxide <50 ppm Nitrogen 0.19 Methane >0.79 Oxygen <0.03 - In real world applications for liquefied natural gas the required purity is a maximum mole percentage of 4% for oxygen and nitrogen.
- Three cases were considered. In the first, 21 metric tons per day of liquefied natural gas produced from landfill gas by purification to remove all NMOCs, water, sulfur compounds and carbon dioxide followed by cryogenic separation of the nitrogen and methane in an integrated distillation column with a reboiler and no condenser. The column operated at 15 prig (2.05 bar) and the liquefied natural gas was sent to storage at this pressure using a cryogenic pump.
- In the second case, 21 metric tons per day of liquefied natural gas produced from landfill gas by purification to remove all NMOCs, water, sulfur compounds and carbon dioxide, as well as most inerts resulting in a feed gas stream that contains 96 mole % methane. This feed is liquefied in the main heat exchanger and sent to storage at a pressure of 3.08 bar.
- The results of the simulation as detailed are presented below in Table 2.
-
TABLE 2 Base case Case 2 (Case 1) LMTD, C 4.86 4.69 UA kJ/C-s 358.80 368.13 Hot Pinch, F −200.84 −136.32 Cold Pinch, F −203.65 −140.49 Min Approach, C 1.56 2.32 Exchanger Cold duty, kW 1745 1726 LNG temp, C −156.25 Compressor power, kW 490 493 Methane Recovery, % 91.82 Column pressure, psig 15 14.3 LNG production, tpd 21.0 21.0 - Both the heat exchanger area and the liquefaction power are similar for the two cases. The methane produced in
case 2 is 91.82% purity which is acceptable for the production of liquefied natural gas from biogas. The waste gas is used for regeneration of the cleanup PSA/TSA and is eventually flared or used to generate power in an engine or turbine. -
FIG. 2 is a schematic of an integrated mixed refrigerant liquefied natural gas liquefier with a reboiler column for nitrogen removal. Clean biogas as liquefier feed is fed throughline 40 where it passes through the main heat exchanger AA. The warmer biogas will enter through open valve V7 a distillation column with reboiler AB where it will be subjected to distillation. The natural gas is recovered through the bottom of the column and heat exchanger through line 41 where it will be fed to a storage tank AC. The stored liquefied natural gas may be recovered through open valve V2 andline 41A. - Some of the liquefied natural gas is vented from storage tank AC through
line 42 as natural gas. This vented natural gas will join with the gas stream coming off the top of the distillation column with reboiler AB. This waste gas stream is primarily nitrogen and is fed through the main heat exchanger AA to exchange its colder temperature before being recovered as a waste gas steam for regeneration of adsorption beds or for use in power generation. - A separator AD provides mixed refrigerant to the main heat exchanger AA through
line 44 where is will be cooled and fed throughline 45 to inlet separator AE. The inlet separator separates the eventual mixed refrigerant liquid residual from cold box outlet to avoid liquid at compressor suction and feeds through line 46 to a refrigerant compressor AF. The resulting mixed refrigerant is fed throughline 47 to a coalescing filter AG where assist in oil droplet removal from the mixed refrigerant. The mixed refrigerant free of the oil droplets is fed throughline 48 to a cooler AH where the cooled mixed refrigerant is fed throughline 49 to a separator AI. The bottoms from the separator AI are fed through line 4541 and open valve V4 through a pump AJ and line 52 where it will joinline 50 in the main heat exchanger AA. A portion of the bottoms is fed through line 54 and open valve V5 back to the separator AI. - The tops from the separator AI are fed through
line 50 back through the main heat exchanger AA. Aline 53 and open valve V3 will bypass a portion of the hot gas back to line 45 t before entering inlet separator AE.Line 50 which contains the nitrogen from the top of separator AI will collect heat from the main heat exchanger AA and after passing through open valve V6 enter separator AD before entering the main heat exchanger AA throughline 44 to cool down. - A heat and mass balance simulation was performed according to the method described for
FIG. 2 for an integrated nitrogen recovery unit and distillation versus just a nitrogen recovery unit. Table 3 below shows a greater recovery of methane using less energy for the inventive method. -
TABLE 3 NRU distillation change methane recovery 83% 90% +8,4% specific consumption 0,63 0,58 −8,6% (kW/kg LNG) - In
FIG. 3 , the same legends and numbers are used as were used to describeFIG. 2 except for the inclusion of a pump between the distillation column with reboiler AB and storage tank AC. The pump AK is employed to assist removing liquefied natural gas from the bottom of the distillation column with reboiler AB through line 60 and directing throughline 61 the liquefied natural gas into the storage tank AC. -
FIG. 4 describes in greater detail the distillation column with reboiler as detailed inFIGS. 2 and 3 . The numbering system as used forFIG. 3 is also employed in describingFIG. 4 . The packed distillation column with reboiler AB receives the biogas or landfill gas from a liquefier (not shown) throughline 40. This feed gas stream will pass some heat to the reboiler portion of the distillation column and reboiler AB before passing through a Joule-Thomson valve and entering the top of the packed distillation column and reboiler AB. - The distillation column and reboiler AB is packed with the appropriate packing or plates to separate nitrogen from the methane. The nitrogen gas will be vented from the top of the packed distillation column and reboiler AB through
line 43 and fed back to the main heat exchanger AA referred to inFIG. 3 to provide some cold to the main heat exchanger AA. The liquefied natural gas is recovered through the reboiler portion of the distillation column and reboiler through line 60 and optional cryogenic pump AK to line 61 for delivery to the storage tank AC as depicted in the description ofFIG. 3 . - While this invention has been described with respect to particular embodiments thereof, it is apparent that numerous other forms and modifications of the invention will be obvious to those skilled in the art. The appended claims in this invention generally should be construed to cover all such obvious forms and modifications which are within the true spirit and scope of the invention.
Claims (11)
1. A method for producing liquefied natural gas comprising the steps of:
a) feeding a methane-containing gas stream to a heat exchanger, wherein the methane-containing gas stream will be cooled by the heat exchanger;
b) feeding the methane-containing gas to a reboiler of a distillation column, wherein the distillation column can be packed or contain sieve trays;
c) feeding the methane containing gas to a valve where part of the methane containing gas is vaporized and its temperature is decreased due to Joule Thompson effect;
d) feeding the methane containing gas to the top of a packed distillation column;
e) removing methane from the bottom of the packed distillation column as liquefied natural gas;
f) recovering nitrogen; and
g) feeding the recovered nitrogen through the heat exchanger.
2. The method as claimed in claim 1 wherein nitrogen is collected from the top of the packed distillation column and fed through a heat exchanger to recover cold.
3. The method as claimed in claim 1 wherein said methane-containing gas stream is selected from the group consisting of biogas and landfill gas.
4. The method as claimed in claim 1 wherein nitrogen from a mixed refrigerant source is fed through the heat exchanger to a first separator.
5. The method as claimed in claim 1 wherein the first separator feeds the nitrogen back through the heat exchanger.
6. The method as claimed in claim 1 wherein the nitrogen is purified by passing through a second separator.
7. The method as claimed in claim 6 wherein the purifying further comprises a step of compressing and coalescing the nitrogen.
8. The method as claimed in claim 1 wherein purifying the nitrogen comprises the steps of feeding nitrogen through the heat exchanger to the first separator; feeding the nitrogen to an inlet separator; feeding the nitrogen to a refrigerant compressor, wherein a mixed refrigerant is formed; feeding the mixed refrigerant to a coalescing filter; feeding the mixed refrigerant to a cooler; feeding the mixed refrigerant to the second separator wherein nitrogen is separated and fed through the heat exchanger to the first separator.
9. The method as claimed in claim 1 wherein the purified nitrogen provides cold to the heat exchanger.
10. The method as claimed in claim 1 wherein the methane-containing gas is at a pressure of 6 to 15 bar.
11. The method as claimed in claim 1 wherein the cooled methane-containing gas of step a) is at a temperature of about −145° C.
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US201161543863P | 2011-10-06 | 2011-10-06 | |
US13/626,133 US20130205828A1 (en) | 2011-10-06 | 2012-09-25 | Integration of a liquefied natural gas liquefier with the production of liquefied natural gas |
US14/327,739 US20140318177A1 (en) | 2011-10-06 | 2014-07-10 | Integration of a liquefied natural gas liquefier with the production of liquefied natural gas |
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US20220127211A1 (en) * | 2019-09-27 | 2022-04-28 | Wm Intellectual Property Holdings, L.L.C. | System and process for recovering methane and carbon dioxide from biogas and reducing greenhouse gas emissions |
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US11708313B2 (en) * | 2019-09-27 | 2023-07-25 | Wm Intellectual Property Holdings, L.L.C. | System and process for recovering methane and carbon dioxide from biogas and reducing greenhouse gas emissions |
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