US20110094261A1 - Natural gas liquefaction core modules, plants including same and related methods - Google Patents
Natural gas liquefaction core modules, plants including same and related methods Download PDFInfo
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- US20110094261A1 US20110094261A1 US12/604,139 US60413909A US2011094261A1 US 20110094261 A1 US20110094261 A1 US 20110094261A1 US 60413909 A US60413909 A US 60413909A US 2011094261 A1 US2011094261 A1 US 2011094261A1
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 350
- 239000003345 natural gas Substances 0.000 title claims abstract description 174
- 238000000034 method Methods 0.000 title claims abstract description 105
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 39
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- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 28
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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
- 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
- F25J1/0032—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"
- F25J1/0035—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 gas expansion with extraction of work
- F25J1/0037—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 gas expansion with extraction of work of a return 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
- F25J1/003—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
- 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
- F25J1/0032—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"
- F25J1/0045—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 vaporising a liquid return 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
- F25J1/0201—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 only internal refrigeration means, i.e. without external refrigeration
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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
- F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
- F25J1/0232—Coupling of the liquefaction unit to other units or processes, so-called integrated processes integration within a pressure letdown station of a high pressure pipeline system
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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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/10—Processes or apparatus using other separation and/or other processing means using combined expansion and separation, e.g. in a vortex tube, "Ranque tube" or a "cyclonic fluid separator", i.e. combination of an isentropic nozzle and a cyclonic separator; Centrifugal separation
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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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/20—Processes or apparatus using other separation and/or other processing means using solidification of components
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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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/84—Processes or apparatus using other separation and/or other processing means using filter
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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
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/06—Splitting of the feed stream, e.g. for treating or cooling in different ways
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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
- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
- F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
- F25J2220/66—Separating acid gases, e.g. CO2, SO2, H2S or RSH
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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
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/60—Processes or apparatus involving steps for increasing the pressure of gaseous process streams the fluid being hydrocarbons or a mixture of hydrocarbons
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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
- F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
- F25J2235/60—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being (a mixture of) hydrocarbons
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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
- F25J2245/00—Processes or apparatus involving steps for recycling of process streams
- F25J2245/90—Processes or apparatus involving steps for recycling of process streams the recycled stream being boil-off gas from storage
Definitions
- the present invention relates generally to the compression and liquefaction of gases and, more particularly, to the partial liquefaction of a gas, such as natural gas, by a modular natural gas liquefaction plant utilizing a core module.
- Natural gas is a known alternative to combustion fuels such as gasoline and diesel. Much effort has gone into the development of natural gas as an alternative combustion fuel in order to combat various drawbacks of gasoline and diesel including production costs and the subsequent emissions created by the use thereof. As is known in the art, natural gas is a cleaner burning fuel than other combustion fuels. Additionally, natural gas is considered to be safer than gasoline or diesel as natural gas will rise in the air and dissipate, rather than settling.
- natural gas also termed “feed gas” herein
- CNG compressed natural gas
- LNG liquid natural gas
- cascade cycle two of the known basic cycles for the liquefaction of natural gases are referred to as the “cascade cycle” and the “expansion cycle.”
- the cascade cycle consists of a series of heat exchanges with the feed gas, each exchange being at successively lower temperatures until liquefaction is accomplished.
- the levels of refrigeration are obtained with different refrigerants or with the same refrigerant at different evaporating pressures.
- the cascade cycle is considered to be very efficient at producing LNG as operating costs are relatively low.
- the efficiency in operation is often seen to be offset by the relatively high investment costs associated with the expensive heat exchange and the compression equipment associated with the refrigerant system.
- a liquefaction plant incorporating such a system may be impractical where physical space is limited, as the physical components used in cascading systems are relatively large.
- gas is conventionally compressed to a selected pressure, cooled, and then allowed to expand through an expansion turbine, thereby producing work as well as reducing the temperature of the feed gas.
- the low temperature feed gas is then heat exchanged to effect liquefaction of the feed gas.
- such a cycle has been seen as being impracticable in the liquefaction of natural gas since there is no provision for handling some of the components present in natural gas which freeze at the temperatures encountered in the heat exchangers, for example, water and carbon dioxide.
- An additional problem with large facilities is the cost associated with storing large amounts of fuel in anticipation of future use and/or transportation. Not only is there a cost associated with building large storage facilities, but there is also an efficiency issue related therewith as stored LNG will tend to warm and vaporize over time creating a loss of the LNG fuel product. Further, safety may become an issue when larger amounts of LNG fuel product are stored.
- small scale LNG plants have been devised to produce LNG at a pressure letdown station, wherein gas from a relatively high pressure transmission line is utilized to produce LNG and tail gases from the liquefaction process are directed into a single lower pressure downstream transmission line.
- gas from a relatively high pressure transmission line is utilized to produce LNG and tail gases from the liquefaction process are directed into a single lower pressure downstream transmission line.
- such plants may only be suitable for pressure let down stations having a relatively high pressure difference between upstream and downstream transmission lines, or may be inefficient at pressure let down stations having relatively low pressure drops.
- the production of LNG at certain existing let down stations may be impractical using existing LNG plants.
- the costs to design, engineer, and manufacture LNG plants for a variety of natural gas source locations which may each supply NG at different gas conditions, such as at various temperatures and pressures, may make it impractical to build an LNG plant for smaller markets.
- a method of natural gas liquefaction may include liquefying natural gas from a first natural gas source with a first core module, and liquefying natural gas from at least a second natural gas source having a gas property different than a gas property of the first natural gas source with at least a second core module substantially identical to the first core module.
- a method of designing a natural gas liquefaction plant may include utilizing a preconfigured core module design for a core module configured to receive source gas at site-independent predetermined input conditions, expel tail gas at site-independent predetermined outlet conditions, and liquefy natural gas.
- the method may further include designing a site-specific inlet module configured to provide source gas from a specific natural gas source to the core module at the fixed predetermined input conditions, and designing a site-specific outlet module configured to convey tail gas from the core module at the predetermined tail gas outlet conditions to a specific tail gas stream.
- a method of distributing liquid natural gas may include providing a plurality of substantially identical core modules to a plurality of gaseous natural gas source locations. The method may further include liquefying at least a portion of the gaseous natural gas from each of the plurality of gaseous natural gas sources with the plurality of substantially identical core modules to provide liquid natural gas at each of the plurality of gaseous natural gas source locations.
- methods of natural gas liquefaction may comprise liquefying gaseous natural gas with a plurality of substantially identical core modules at a single site.
- a modular natural gas liquefaction plant may include a core module, an inlet module and an outlet module.
- the core module may include a processed natural gas inlet configured to receive gaseous natural gas at a site-independent predetermined pressure and temperature, a liquid natural gas outlet, and a tail gas outlet configured to expel a tail gas at a site-independent predetermined pressure and temperature.
- the inlet module may include a natural gas source inlet configured to receive gaseous natural gas at a temperature and pressure of a site-specific natural gas source; and a processed natural gas outlet configured to deliver gaseous natural gas to the processed natural gas inlet of the core module at the site-independent predetermined pressure and temperature.
- the outlet module may include a tail gas inlet configured to receive a tail gas from the tail gas outlet of the core module at the site-independent predetermined pressure and temperature; and a processed tail gas outlet configured to deliver the tail gas to a site-specific location at a site-specific pressure and temperature.
- FIG. 1 is a schematic overview of a core module for a liquefaction plant according to an embodiment of the present invention.
- FIG. 2 is a flow diagram depicting a site having a gas supply pipeline and a tail gas pipeline for a modular type liquefaction plant according to embodiments of the present invention.
- FIG. 3 is a flow diagram depicting another site having a single gas supply pipeline that may be utilized to supply gas to and receive tail gas from a modular type liquefaction plant according to embodiments of the present invention.
- FIG. 1 Illustrated in FIG. 1 is a schematic overview of a core module 2 for natural gas (NG) liquefaction according to an embodiment of the present invention.
- the core module 2 may include a primary gas inlet 4 coupled to a splitter 6 , and a primary gas outlet 8 coupled to a mixer 10 .
- a process stream 12 , a cooling stream 14 , and a transfer motive gas stream 16 may originate from the splitter 6 of the primary gas inlet 4 and the cooing stream 14 , as well as tail streams 26 , 30 , may be combined in the mixer 10 and directed out of the core module 2 through the primary gas outlet 8 .
- the process stream 12 may be directed through a NG inlet 32 from the splitter 6 , and then directed through a primary heat exchanger 34 and an expansion valve 36 .
- the process stream 12 may then be directed though a gas-liquid separation tank 38 , a transfer tank 40 , a hydrocyclone 42 and a filter 44 .
- the process stream 12 may be directed through a splitter 46 , a valve 48 , a storage tank 50 and a liquid natural gas (LNG) outlet 52 .
- LNG liquid natural gas
- the cooling stream 14 may be directed through a cooling fluid inlet 54 from the splitter 6 , and then directed through a turbo compressor 56 , an ambient heat exchanger 58 , the primary heat exchanger 34 , a turbo expander 60 , and finally, through a cooling fluid outlet 62 and into the mixer 10 .
- the transfer motive gas stream 16 may be directed through a transfer fluid inlet 64 from the splitter 6 , and then through an expansion valve 66 to the transfer tank 40 .
- the transfer motive gas stream 16 may originate from other suitable locations of the core module 2 .
- the transfer motive gas stream 16 may also be directed through the primary heat exchanger 34 .
- a first tail gas stream 30 may include a combination of streams from the core module 2 .
- the first tail gas stream 30 may include a carbon dioxide management stream 22 , a separation chamber vent stream 18 , a transfer tank vent stream 20 , and a storage tank vent stream 24 .
- the carbon dioxide management stream 22 may be directed from an underflow outlet 82 of the hydrocyclone 42 , and then may be directed through a sublimation chamber 70 , the primary heat exchanger 34 and finally through a first tail gas outlet 72 into the mixer 10 .
- the separation chamber vent stream 18 may be directed from a gas outlet of the gas liquid separation tank 38
- the transfer tank vent stream 20 may be directed from the transfer tank 40
- a storage tank vent stream 24 may be directed from the storage tank 50 .
- the separation chamber vent stream 18 , the transfer tank vent stream 20 , and the storage tank vent stream 24 may then be directed through a mixer 74 , the heat exchanger 34 , a compressor 76 , and into the sublimation chamber 70 to be mixed with the carbon dioxide management stream 22 to form the first tail gas stream 30 .
- a second tail gas stream 26 may be directed from an outlet of the splitter 46 .
- the second tail gas stream 26 may then be directed through a pump 78 , the heat exchanger 34 , and finally, through a second tail gas outlet 80 into the mixer 10 .
- the pump 78 may not be required and may not be included in the plant 10 .
- sufficient pressure may be imparted to the process stream 12 within the transfer tank 40 by the transfer motive gas stream 16 such that the pump 78 may not be required and may not be included in the core module 2 .
- a gaseous NG may be provided to the core module 2 through the primary gas inlet 4 , which may be divided by the splitter 6 into the cooling stream 14 , the process stream 12 , and the transfer motive stream 16 .
- the cooling stream 14 may be directed from the splitter 6 through the cooling fluid inlet 54 and then directed into the turbo compressor 56 to be compressed.
- the compressed cooling stream 14 may then exit the turbo compressor 56 and be directed into the ambient heat exchanger 58 , which may transfer heat from the cooling stream 14 to ambient air.
- the cooling stream 14 may be directed through a first channel of the primary heat exchanger 34 , where it may be further cooled.
- the primary heat exchanger 34 may comprise a high performance aluminum multi-pass plate and fin type heat exchanger, such as may be purchased from Chart Industries Inc., 1 Infinity Corporate Centre Drive, Suite 300, Garfield, Heights, Ohio 44125, or other well known manufacturers of such equipment.
- the cooling stream 14 may be expanded and cooled in the turbo expander 60 .
- the turbo expander 60 may comprise a turbo expander having a specific design for a mass flow rate, pressure level of gas, and temperature of gas to the inlet, such as may be purchased from GE Oil and Gas, 1333 West Loop South, Houston, Tex. 77027-9116, USA, or other well known manufacturers of such equipment.
- the energy required to drive the turbo compressor 56 may be provided by the turbo expander 60 , such as by the turbo expander 60 being directly connected to the turbo compressor 56 or by the turbo expander 60 driving an electrical generator (not shown) to produce electrical energy to drive an electrical motor (not shown) that may be connected to the turbo compressor 56 .
- the cooled cooling stream 14 may then be directed through a second channel of the primary heat exchanger 34 and then through the cooling fluid outlet 62 into the mixer 10 to be directed out of the core module 2 through the primary gas outlet 8 .
- a gaseous NG stream may be directed from the splitter 6 into the NG inlet 32 to provide the process stream 12 to the core module 2 and the process stream 12 may then be directed through a third channel of the primary heat exchanger 34 .
- Heat from the process stream 12 may be transferred to the cooling stream 14 within the primary heat exchanger 34 and the process stream 12 may exit the primary heat exchanger 34 in a cooled gaseous state.
- the process stream 12 may then be directed through the expansion valve 36 , such as a Joule-Thomson expansion valve, wherein the process stream 12 may be expanded and cooled to form a liquid natural gas (LNG) portion and a gaseous NG portion.
- LNG liquid natural gas
- carbon dioxide (CO 2 ) that may be contained within the process stream 12 may become solidified and suspended within the LNG portion, as carbon dioxide has a higher freezing temperature than methane (CH 4 ), which is the primary component of NG.
- the LNG portion and the gaseous portion may be directed into the gas-liquid separation tank 38 , and the LNG portion may be directed out of the separation tank 38 as a LNG process stream 12 , which may then be directed into the transfer tank 40 .
- a transfer motive gas stream 16 may then be directed through the transfer motive gas inlet 64 from the splitter 6 through the valve 66 , which may be utilized to regulate the pressure of the transfer motive gas stream 16 prior to being directed into the transfer tank 40 .
- the transfer motive gas stream 16 may facilitate the transfer of the liquid NG process stream 12 through the hydrocyclone 42 , such as may be available, for example, from Krebs Engineering of Arlington, Ariz., wherein the solid CO 2 may be separated from the liquid NG process stream 12 .
- a separate transfer tank 40 may not be used and instead a portion of the separation tank 38 may be utilized as a transfer tank to transfer the process stream 12 into the hydrocyclone 42 .
- a pump may be utilized to transfer the process stream from the separation tank 38 into the hydrocyclone.
- a pump may provide certain advantages, as it may provide a constant system flow, when compared to a batch process utilizing a transfer tank.
- a transfer tank configuration such as shown in FIG. 1 , may provide a more reliable process stream 12 flow.
- a plurality of transfer tanks 40 may be utilized; optionally, a plurality of hydrocyclones 42 may also be utilized.
- Such a configuration may improve flow regularity of the process stream 12 through the core module 2 while maintaining a reliable flow of the process stream 12 .
- an accumulator (not shown) may be provided and the transfer motive gas stream 16 may be accumulated in the accumulator prior to being directed into the transfer tank 40 to facilitate an expedient transfer of the process stream 12 out of the transfer tank 40 and through the hydrocyclone 42 .
- a slurry including the solid CO 2 from the LNG process stream 12 may be directed through an underflow outlet 82 and the LNG process stream 12 may be directed through an overflow outlet 84 .
- the LNG process stream 12 may then be directed through the filter 44 , which may remove any remaining CO 2 or other impurities, which may be removed from the system through a filter outlet 86 , such as during a cleaning process.
- the filter 44 may comprise one screen filter or a plurality of screen filters that are placed in parallel.
- a substantially pure LNG process stream 12 such as substantially pure liquid CH4, may then exit the filter 44 and be directed into a LNG process stream 12 and a secondary LNG stream that may form the second tail stream 26 .
- the LNG process stream 12 may be directed through the valve 48 and into the storage tank 50 , wherein it may be withdrawn for use through the LNG outlet 52 , such as to a vehicle which is powered by LNG or into a transport vehicle.
- the CO 2 slurry in the hydrocyclone 42 may be directed through the underflow outlet 82 to form the CO 2 management stream 22 and be directed to the CO 2 sublimation chamber 70 to sublimate the solid CO 2 for removal from the core module 2 .
- the separation chamber vent stream 18 , the transfer tank vent stream 20 and the storage tank vent stream 24 may be combined in the mixer 74 to provide a gas stream 28 that may be used to sublimate the CO 2 management stream 22 .
- the gas stream 28 may be relatively cool upon exiting the mixer 74 and may be directed through a fourth channel of the primary heat exchanger 34 to extract heat from the process stream 12 in the third channel of the primary heat exchanger 34 .
- the gas stream 28 may then be directed through the compressor 76 to further pressurize and warm the gas stream 28 prior to directing the gas stream 28 into the CO 2 sublimation chamber 70 to sublimate the CO 2 of the CO 2 management stream 22 from the underflow outlet 82 of the hydrocyclone 42 .
- a heat exchanger such as described in application Ser. No. 11/855,071, filed Sep. 13, 2007, titled Heat Exchanger and Associated Method, owned by the assignee of the present invention, the disclosure thereof previously incorporated by reference in its entirely herein, may be utilized as the sublimation chamber 70 .
- a portion of the gas stream 28 such as an excess flow portion, may be directed through a tee (not shown) and into the mixer 10 , rather than being directed into the CO 2 sublimation chamber 70 .
- the combined gaseous CO 2 from the CO 2 management stream 22 and the gases from the stream 28 may then exit the sublimation chamber 70 as the first tail gas stream 30 , which may be relatively cool.
- the first tail gas stream 30 may be just above the CO 2 sublimation temperature upon exiting the sublimation chamber 70 .
- the first tail gas stream 30 may then be directed through a fifth channel of the primary heat exchanger 34 to extract heat from the process stream 12 in the third channel prior to entering the mixer 8 through the first tail gas outlet 72 and being directed out of the core module 2 through the primary gas outlet 8 .
- the second tail gas stream 26 which may initially comprise a secondary substantially pure LNG stream from the splitter 46 , may be directed through the pump 78 .
- the pump 78 may not be required and may not be included in the core module 2 .
- sufficient pressure may be imparted to the process stream 12 within the transfer tank 40 by the transfer motive gas stream 16 such that the pump 78 may not be required and may not be included in the core module 2 .
- the second tail gas stream 26 may then be directed through a sixth channel of the primary heat exchanger 34 , where it may extract heat from the process stream 12 in the third channel, and may become vaporized to form gaseous NG.
- the second tail stream 26 may then be directed into the mixer 10 via the second tail gas outlet 80 and out of the core module 2 through the primary gas outlet 8 .
- the process stream 12 may be cooled first by the cooling stream 14 , which may extract about two-thirds (2 ⁇ 3) of the heat to be removed from the process stream 12 within the heat exchanger 34 . Remaining cooling of the process stream 12 within the primary heat exchanger 34 may then be accomplished by the transfer of heat from the process stream 12 to the second tail gas stream 26 . In view of this, the amount of flow that is directed into the second tail gas stream 26 may be regulated to achieve a particular amount of heat extraction from the process stream 12 within the heat exchanger 34 .
- the core module 2 may be configured to utilize a desired site-independent predetermined inlet gas condition, such as a desired site-independent predetermined inlet pressure level and a desired site-independent predetermined inlet temperature level, for the source gas directed into the primary gas inlet 4 .
- a desired site-independent predetermined inlet gas condition such as a desired site-independent predetermined inlet pressure level and a desired site-independent predetermined inlet temperature level
- the core module 2 may be configured to receive a gas into the primary gas inlet 4 at a pressure and temperature level that may each be selected independent of a specific source gas pressure and temperature at a site at which the core module 2 is to be utilized.
- the core module 2 may be configured to utilize a desired site-independent predetermined outlet gas condition, such as a desired site-independent predetermined outlet pressure level and a desired site-independent predetermined outlet temperature level, for the tail gas directed out of the primary gas outlet 8 .
- a desired site-independent predetermined outlet gas condition such as a desired site-independent predetermined outlet pressure level and a desired site-independent predetermined outlet temperature level
- a modular type natural gas liquefaction plant for a specific site 88 may include a customized inlet module 90 and a customized outlet module 92 in addition to the preconfigured core module 2 , as shown in FIGS. 2 and 3 .
- the inlet module 90 may include an inlet 94 to receive a source gas, such as gaseous NG, from the specific site 88 , such as from a NG supply pipeline 96 , into the inlet module 90 .
- a source gas such as gaseous NG
- the source gas may be processed, such as by one or more of compression, expansion, cooling, heating, dehydration, and filtration using conventional methods and devices, to meet the site-independent predetermined inlet gas conditions for the core module 2 .
- the source gas may then be directed into the primary gas inlet 4 of the core module 2 at the site-independent predetermined inlet conditions, such as a site-independent predetermined temperature and pressure.
- the outlet module 92 may be configured to receive the tail gas stream, including the combined first tail gas stream 30 , second tail gas stream 26 , and cooling stream 14 , directed out of the primary gas outlet 8 of the core module 2 .
- the tail gas stream may be processed, such as by one or more of compression, expansion, cooling, and heating using conventional methods and devices, to meet the site 88 specific tail gas requirements.
- the tail gas may then be directed out of an outlet 98 of the outlet module 92 to a site-specific location at a site-specific pressure and temperature.
- a site-specific location for the tail gas may be a relatively low pressure NG pipeline 100 , such as shown in FIG. 2 , and the tail gas may be processed to an appropriate relatively low pressure.
- the site-specific location for the tail gas may be the same NG supply pipeline 96 that provides the NG source gas, such as shown in FIG. 3 , and the tail gases may require compression within the outlet module to provide the tail gas to the supply pipeline 96 at an appropriate pressure.
- the inlet module 90 and the outlet module 92 may be configured to enable a preconfigured core module 2 to operate at any number of specific sites, which may each provide a source gas having different properties, such as gas composition, gas pressure, and gas temperature, and may have unique tail gas requirements.
- one or more of the source gas conditions and the required tail gas conditions for a specific site may coincidentally meet one or more of the site-independent predetermined gas conditions for the primary gas inlet 4 and primary gas outlet 8 of the core module 2 .
- one or more of the inlet module 90 and the outlet module 92 may simply be configured as a gas conduit.
- the inlet module 90 and the outlet module 92 allow a specific site 88 to be adapted to the core module 2 , and the core module 2 may be utilized at any number of sites 88 with minimal or no internal modifications required.
- a core module 2 may be mass produced and then delivered to numerous sites.
- a common design between numerous core modules 2 may not necessarily provide the most energy efficient system at every site, when compared to custom site-specific plants, a common design for core module 2 may result in other efficiencies, improved safety, a reduction in engineering and design cost, a reduction in maintenance cost, improved reliability and a reduction in initial investment cost that may outweigh any inefficiencies that may exist at an individual site.
- the core module 2 may be configured with some flexibility in its mechanical design, such as shown in FIG. 1 , to allow accommodation of somewhat varying input and output temperatures and pressures without necessitating a replacement of any of the physical components of the core module 2 .
- the plant may be designed and configured for specific site-independent predetermined gas conditions for the primary gas inlet 4 and the primary gas outlet 5 selected for efficiency.
- the core module 2 may be configured to utilize an inlet pressure level of about 800 psia and a inlet temperature level of about 50° F. to about 120° F. Extensive modeling has suggested that approximately 800 psia may be the most efficient incoming pressure. Additionally, for example and not limitation, the desired predetermined specified outlet pressure level of the core module 2 may be about 100 psia. In general, the lower the outlet pressure level, the higher the production rate. However, from studying location data the inventors of the present invention have discovered that ideal low pressure lines with enough available flow to accommodate tail gas from the core module 2 are few and may be difficult to access.
- an outlet or exit pressure of about 100 psia may provide efficiencies for the cooling stream 14 of the core module 2 , since a higher gas pressure may result in a lower critical temperature for certain components of the gas, such as CO 2 , which may allow the cooling stream 14 to reach a lower temperature.
- the core module 2 may not include the primary gas inlet 4 , the splitter 6 , the primary gas outlet 8 and the mixer 10 .
- the inlet gas streams 12 , 14 , 16 may be maintained separately and the outlet gas streams 14 , 26 , 30 may also be maintained separately, which may provide a more flexible core module 2 , such as described in U.S. patent application Ser. No. ______, filed on even date herewith, for METHODS OF NATURAL GAS LIQUEFACTION AND NATURAL GAS LIQUEFACTION PLANTS UTILIZING MULTIPLE AND VARYING GAS STREAMS (Attorney Docket No. 2939-9179US (BA-350)), previously incorporated by reference herein in its entirety.
- the core module 2 may have a relatively small physical size and may be readily transported from one geographic location to another. Such a compact design may allow core modules 2 to be mass produced at one or more locations and transported to various sites, such as by conventional rail and roadway transport. Furthermore, the mass production of core modules 2 may allow components to be purchased and manufactured in relatively high numbers, which may reduce the cost of components and may make it economically feasible to design unique and especially efficient components for the core module 2 . Mass production may result in replacement components being relatively inexpensive, resulting in lower maintenance cost. Furthermore, if a core module 2 at a site became damaged and required extensive repair or replacement, the damaged core module 2 could be replaced with another substantially identical core module 2 that is operable relatively quickly and cost effectively. Additional and various other advantages may also result from the mass production of substantially identical core modules 2 .
- Modular LNG plants utilizing substantially identical core modules 2 may also be utilized to more efficiently and cost effectively distribute LNG. It may be relatively expensive to ship LNG from a large plant, such as by truck, to each point-of-use location where it is required. It may also be relatively expensive and difficult to provide infrastructure, such as a LNG pipeline, to transport LNG from a large plant to various distant locations. However, a plurality of modular LNG plants utilizing substantially identical core modules 2 may be located at or near various LNG point-of-use locations, such as LNG vehicle fueling stations, having existing gaseous NG sources, which may have various and different pressures and temperatures, and produce LNG from the gaseous NG sources at or near the LNG point-of-use locations. In view of this, existing gaseous NG infrastructure may be utilized with core modules 2 according to the present invention to distribute LNG in a relatively efficient and cost effective manner.
- the core module 2 may be configured as a “small-scale” natural gas liquefaction core module 2 which is coupled to a source of natural gas such as a pipeline 96 , although other sources, such as a well head, are contemplated as being equally suitable.
- the term “small-scale” is used to differentiate from a larger-scale plant having the capacity of producing, for example 70,000 gallons of LNG or more per day.
- the presently disclosed liquefaction plant may have a capacity of producing, for example, approximately 30,000 gallons of LNG a day but may be scaled for a different output as needed and is not limited to small-scale operations or plants.
- the liquefaction core module 2 of the present invention may be considerably smaller in size than a large-scale plant and may be transported from one site to another, as previously described herein.
- the core module 2 may also be configured as a large-scale plant if desired.
- a core module 2 may also be relatively inexpensive to build and operate, and may be configured to require little or no operator oversight.
- a plurality of core modules 2 may be utilized at a single site, such as at sites that have a relatively large LNG demand, sites having variable demand or at critical demand sites.
- a site having a relatively high LNG demand may include a plurality of core modules 2 , each producing LNG simultaneously to meet the demand.
- a site having a LNG demand of about 120,000 gallons a day may utilize four substantially identical core modules 2 , each configured to produce about 30,000 gallons of LNG a day.
- the site may include one or more additional substantially identical core modules 2 , which may be rotated into use at the site, which may allow individual core modules 2 to be shut down for cleaning, servicing or repairs while backup core modules 2 are utilized to make up for the lost LNG production, thus allowing the LNG demand to be met at all times. If a site has a particularly critical LNG demand, a greater redundancy in core modules 2 , and thus backup LNG production capacity, may be provided. Additionally, if a site has variable demand, as demand increases additional core modules 2 at the site may be activated and utilized to meet the increased demand, likewise, the additional core modules 2 may be deactivated as demand decreases.
- core modules 2 may be designed in several sizes or capacities, and core modules having different sizes and capacities may be combined in various combinations to meet any particular sites LNG demand.
- the core module 2 and methods illustrated and described herein may include the use of any well known apparatus and methods, such as within the inlet module 90 , to remove carbon dioxide, nitrogen, oxygen, ethane, etc. from the natural gas supply before entry into the core module 2 . Additionally, if the source of natural gas has little carbon dioxide, nitrogen, oxygen, ethane, etc., the use of hydrocyclones and carbon dioxide sublimation in the liquefaction process and core module 2 may not be needed and may not be included.
Abstract
Description
- This application is related to U.S. patent application Ser. No. 09/643,420, filed Aug. 23, 2001, for APPARATUS AND PROCESS FOR THE REFRIGERATION, LIQUEFACTION AND SEPARATION OF GASES WITH VARYING LEVELS OF PURITY, now U.S. Pat. No. 6,425,263, issued Jul. 30, 2002, which is a continuation of U.S. patent application Ser. No. 09/212,490, filed Dec. 16, 1998, for APPARATUS AND PROCESS FOR THE REFRIGERATION, LIQUEFACTION AND SEPARATION OF GASES WITH VARYING LEVELS OF PURITY, now U.S. Pat. No. 6,105,390, issued Aug. 22, 2000, which claims the benefit of U.S. Provisional Patent Application Ser. No. 60/069,698 filed Dec. 16, 1997. This application is also related to U.S. patent application Ser. No. 11/381,904, filed May 5, 2006, for APPARATUS FOR THE LIQUEFACTION OF NATURAL GAS AND METHODS RELATING TO SAME; U.S. patent application Ser. No. 11/383,411, filed May 15, 2006, for APPARATUS FOR THE LIQUEFACTION OF NATURAL GAS AND METHODS RELATING TO SAME; U.S. patent application Ser. No. 11/560,682, filed Nov. 16, 2006, for APPARATUS FOR THE LIQUEFACTION OF GAS AND METHODS RELATING TO SAME; U.S. patent application Ser. No. 11/536,477, filed Sep. 28, 2006, for APPARATUS FOR THE LIQUEFACTION OF A GAS AND METHODS RELATING TO SAME; U.S. patent application Ser. No. 11/674,984, filed Feb. 14, 2007, for SYSTEMS AND METHODS FOR DELIVERING HYDROGEN AND SEPARATION OF HYDROGEN FROM A CARRIER MEDIUM, which is a continuation-in-part of U.S. patent application Ser. No. 11/124,589, filed May 5, 2005, for APPARATUS FOR THE LIQUEFACTION OF NATURAL GAS AND METHODS RELATING TO SAME, now U.S. Pat. No. 7,219,512, issued May 22, 2007, which is a continuation of U.S. patent application Ser. No. 10/414,991, filed Apr. 14, 2003, for APPARATUS FOR THE LIQUEFACTION OF NATURAL GAS AND METHODS RELATING TO SAME, now U.S. Pat. No. 6,962,061, issued Nov. 8, 2005, and U.S. patent application Ser. No. 10/414,883, filed Apr. 14, 2003, for APPARATUS FOR THE LIQUEFACTION OF NATURAL GAS AND METHODS RELATING TO SAME, now U.S. Pat. No. 6,886,362, issued May 3, 2005, which is a divisional of U.S. patent application Ser. No. 10/086,066, filed Feb. 27, 2002, for APPARATUS FOR THE LIQUEFACTION OF NATURAL GAS AND METHODS RELATED TO SAME, now U.S. Pat. No. 6,581,409, issued Jun. 24, 2003, and which claims the benefit of U.S. Provisional Patent Application Ser. No. 60/288,985, filed May 4, 2001, for SMALL SCALE NATURAL GAS LIQUEFACTION PLANT. This application is also related to U.S. patent application Ser. No. 11/855,071, filed Sep. 13, 2007, for HEAT EXCHANGER AND ASSOCIATED METHODS; U.S. patent application Ser. No. ______, filed on even date herewith, for COMPLETE LIQUEFACTION METHODS AND APPARATUS (Attorney Docket No. 2939-9177US (BA-347)); and U.S. patent application Ser. No. ______, filed on even date herewith, for METHODS OF NATURAL GAS LIQUEFACTION AND NATURAL GAS LIQUEFACTION PLANTS UTILIZING MULTIPLE AND VARYING GAS STREAMS (Attorney Docket No. 2939-9179US (BA-350)). The disclosure of each of the foregoing documents is hereby incorporated by reference in its entirety.
- This invention was made with government support under Contract Number DE-AC07-05ID14517 awarded by the United States Department of Energy. The government has certain rights in the invention.
- The present invention relates generally to the compression and liquefaction of gases and, more particularly, to the partial liquefaction of a gas, such as natural gas, by a modular natural gas liquefaction plant utilizing a core module.
- Natural gas is a known alternative to combustion fuels such as gasoline and diesel. Much effort has gone into the development of natural gas as an alternative combustion fuel in order to combat various drawbacks of gasoline and diesel including production costs and the subsequent emissions created by the use thereof. As is known in the art, natural gas is a cleaner burning fuel than other combustion fuels. Additionally, natural gas is considered to be safer than gasoline or diesel as natural gas will rise in the air and dissipate, rather than settling.
- To be used as an alternative combustion fuel, natural gas (also termed “feed gas” herein) is conventionally converted into compressed natural gas (CNG) or liquified (or liquid) natural gas (LNG) for purposes of storing and transporting the fuel prior to its use. Conventionally, two of the known basic cycles for the liquefaction of natural gases are referred to as the “cascade cycle” and the “expansion cycle.”
- Briefly, the cascade cycle consists of a series of heat exchanges with the feed gas, each exchange being at successively lower temperatures until liquefaction is accomplished. The levels of refrigeration are obtained with different refrigerants or with the same refrigerant at different evaporating pressures. The cascade cycle is considered to be very efficient at producing LNG as operating costs are relatively low. However, the efficiency in operation is often seen to be offset by the relatively high investment costs associated with the expensive heat exchange and the compression equipment associated with the refrigerant system. Additionally, a liquefaction plant incorporating such a system may be impractical where physical space is limited, as the physical components used in cascading systems are relatively large.
- In an expansion cycle, gas is conventionally compressed to a selected pressure, cooled, and then allowed to expand through an expansion turbine, thereby producing work as well as reducing the temperature of the feed gas. The low temperature feed gas is then heat exchanged to effect liquefaction of the feed gas. Conventionally, such a cycle has been seen as being impracticable in the liquefaction of natural gas since there is no provision for handling some of the components present in natural gas which freeze at the temperatures encountered in the heat exchangers, for example, water and carbon dioxide.
- Additionally, to make the operation of conventional systems cost effective, such systems are conventionally built on a large scale to handle large volumes of natural gas. As a result, fewer facilities are built, making it more difficult to provide the raw gas to the liquefaction plant or facility as well as making distribution of the liquefied product an issue. Another major problem with large-scale facilities is the capital and operating expenses associated therewith. For example, a conventional large-scale liquefaction plant, i.e., producing on the order of 70,000 gallons of LNG per day, may cost $16.3 million to $24.5 million, or more, in capital expenses.
- An additional problem with large facilities is the cost associated with storing large amounts of fuel in anticipation of future use and/or transportation. Not only is there a cost associated with building large storage facilities, but there is also an efficiency issue related therewith as stored LNG will tend to warm and vaporize over time creating a loss of the LNG fuel product. Further, safety may become an issue when larger amounts of LNG fuel product are stored.
- In confronting the foregoing issues, various systems have been devised which attempt to produce LNG or CNG from feed gas on a smaller scale, in an effort to eliminate long-term storage issues and to reduce the capital and operating expenses associated with the liquefaction and/or compression of natural gas.
- For example, small scale LNG plants have been devised to produce LNG at a pressure letdown station, wherein gas from a relatively high pressure transmission line is utilized to produce LNG and tail gases from the liquefaction process are directed into a single lower pressure downstream transmission line. However, such plants may only be suitable for pressure let down stations having a relatively high pressure difference between upstream and downstream transmission lines, or may be inefficient at pressure let down stations having relatively low pressure drops. In view of this, the production of LNG at certain existing let down stations may be impractical using existing LNG plants. Furthermore, the costs to design, engineer, and manufacture LNG plants for a variety of natural gas source locations, which may each supply NG at different gas conditions, such as at various temperatures and pressures, may make it impractical to build an LNG plant for smaller markets.
- Additionally, since many sources of natural gas, such as residential or industrial service gas, are considered to be relatively “dirty,” the requirement of providing “clean” or “pre-purified” gas is actually a requirement of implementing expensive and often complex filtration and purification systems prior to the liquefaction process. This requirement simply adds expense and complexity to the construction and operation of such liquefaction plants or facilities.
- In view of the shortcomings in the art, it would be advantageous to provide a process, and a plant for carrying out such a process, of efficiently producing liquefied natural gas, such as on a small scale. More particularly, it would be advantageous to provide a system for producing liquefied natural gas from a source of relatively “dirty” or “unpurified” natural gas at various levels of inlet pressure and inlet temperature and the return of natural gas from the plant. Such a system or process may include various clean-up cycles which are integrated with the liquefaction cycle for purposes of efficiency. Further, it would be advantageous for the process and plant to be readily transportable using available sources of transportation over public roads and highways to other geographic locations. It would be advantageous for the process and plant be capable of being operated in a variety of geographical locations without substantially changing the process and apparatus of the plant.
- It would be additionally advantageous to provide a plant for the liquefaction of natural gas which is relatively inexpensive to build and operate, and which desirably requires little or no operator oversight.
- It would be advantageous to provide a plant for the liquefaction of natural gas which having a core module of substantially standardized components operably coupled in a substantially standardized manner and suitable for use in a wide variety of site conditions with minimal or no internal modification being required of the core module.
- It would be additionally advantageous to provide such a plant which is easily transportable and which may be located and operated at existing sources of natural gas which are within or near populated communities, thus providing easy access for consumers of LNG fuel.
- In some embodiments, a method of natural gas liquefaction may include liquefying natural gas from a first natural gas source with a first core module, and liquefying natural gas from at least a second natural gas source having a gas property different than a gas property of the first natural gas source with at least a second core module substantially identical to the first core module.
- In additional embodiments, a method of designing a natural gas liquefaction plant may include utilizing a preconfigured core module design for a core module configured to receive source gas at site-independent predetermined input conditions, expel tail gas at site-independent predetermined outlet conditions, and liquefy natural gas. The method may further include designing a site-specific inlet module configured to provide source gas from a specific natural gas source to the core module at the fixed predetermined input conditions, and designing a site-specific outlet module configured to convey tail gas from the core module at the predetermined tail gas outlet conditions to a specific tail gas stream.
- In further embodiments, a method of distributing liquid natural gas may include providing a plurality of substantially identical core modules to a plurality of gaseous natural gas source locations. The method may further include liquefying at least a portion of the gaseous natural gas from each of the plurality of gaseous natural gas sources with the plurality of substantially identical core modules to provide liquid natural gas at each of the plurality of gaseous natural gas source locations.
- In additional embodiments, methods of natural gas liquefaction may comprise liquefying gaseous natural gas with a plurality of substantially identical core modules at a single site.
- In yet further embodiments, a modular natural gas liquefaction plant may include a core module, an inlet module and an outlet module. The core module may include a processed natural gas inlet configured to receive gaseous natural gas at a site-independent predetermined pressure and temperature, a liquid natural gas outlet, and a tail gas outlet configured to expel a tail gas at a site-independent predetermined pressure and temperature. The inlet module may include a natural gas source inlet configured to receive gaseous natural gas at a temperature and pressure of a site-specific natural gas source; and a processed natural gas outlet configured to deliver gaseous natural gas to the processed natural gas inlet of the core module at the site-independent predetermined pressure and temperature. Finally, the outlet module may include a tail gas inlet configured to receive a tail gas from the tail gas outlet of the core module at the site-independent predetermined pressure and temperature; and a processed tail gas outlet configured to deliver the tail gas to a site-specific location at a site-specific pressure and temperature.
- The foregoing and other advantages of the invention will become apparent upon reading the following detailed description and upon reference to the drawings.
-
FIG. 1 is a schematic overview of a core module for a liquefaction plant according to an embodiment of the present invention. -
FIG. 2 is a flow diagram depicting a site having a gas supply pipeline and a tail gas pipeline for a modular type liquefaction plant according to embodiments of the present invention. -
FIG. 3 is a flow diagram depicting another site having a single gas supply pipeline that may be utilized to supply gas to and receive tail gas from a modular type liquefaction plant according to embodiments of the present invention. - A modular type liquefaction plant having a core module designed so that it may be used for a variety of site conditions, may be readily transported to site locations, and may be readily manufactured using common, substantially standardized components therein so as to be capable of use at a wide variety of site locations and conditions substantially without modification.
- Illustrated in
FIG. 1 is a schematic overview of acore module 2 for natural gas (NG) liquefaction according to an embodiment of the present invention. Thecore module 2 may include aprimary gas inlet 4 coupled to asplitter 6, and aprimary gas outlet 8 coupled to amixer 10. Aprocess stream 12, acooling stream 14, and a transfermotive gas stream 16 may originate from thesplitter 6 of theprimary gas inlet 4 and the cooingstream 14, as well as tail streams 26, 30, may be combined in themixer 10 and directed out of thecore module 2 through theprimary gas outlet 8. - As shown in
FIG. 1 , theprocess stream 12 may be directed through aNG inlet 32 from thesplitter 6, and then directed through aprimary heat exchanger 34 and anexpansion valve 36. Theprocess stream 12 may then be directed though a gas-liquid separation tank 38, atransfer tank 40, ahydrocyclone 42 and afilter 44. Finally, theprocess stream 12 may be directed through asplitter 46, avalve 48, astorage tank 50 and a liquid natural gas (LNG)outlet 52. - As further shown in
FIG. 1 , the coolingstream 14 may be directed through a coolingfluid inlet 54 from thesplitter 6, and then directed through aturbo compressor 56, anambient heat exchanger 58, theprimary heat exchanger 34, aturbo expander 60, and finally, through a coolingfluid outlet 62 and into themixer 10. Additionally, the transfermotive gas stream 16 may be directed through atransfer fluid inlet 64 from thesplitter 6, and then through anexpansion valve 66 to thetransfer tank 40. In additional embodiments, the transfermotive gas stream 16 may originate from other suitable locations of thecore module 2. Optionally, the transfermotive gas stream 16 may also be directed through theprimary heat exchanger 34. - A first
tail gas stream 30 may include a combination of streams from thecore module 2. For example, as shown inFIG. 1 , the firsttail gas stream 30 may include a carbondioxide management stream 22, a separationchamber vent stream 18, a transfertank vent stream 20, and a storagetank vent stream 24. The carbondioxide management stream 22 may be directed from anunderflow outlet 82 of thehydrocyclone 42, and then may be directed through asublimation chamber 70, theprimary heat exchanger 34 and finally through a firsttail gas outlet 72 into themixer 10. Additionally, the separationchamber vent stream 18 may be directed from a gas outlet of the gasliquid separation tank 38, the transfertank vent stream 20 may be directed from thetransfer tank 40, and a storagetank vent stream 24 may be directed from thestorage tank 50. The separationchamber vent stream 18, the transfertank vent stream 20, and the storagetank vent stream 24 may then be directed through amixer 74, theheat exchanger 34, acompressor 76, and into thesublimation chamber 70 to be mixed with the carbondioxide management stream 22 to form the firsttail gas stream 30. - Finally, as shown in
FIG. 1 , a secondtail gas stream 26 may be directed from an outlet of thesplitter 46. The secondtail gas stream 26 may then be directed through apump 78, theheat exchanger 34, and finally, through a secondtail gas outlet 80 into themixer 10. In additional embodiments, thepump 78 may not be required and may not be included in theplant 10. For example, sufficient pressure may be imparted to theprocess stream 12 within thetransfer tank 40 by the transfermotive gas stream 16 such that thepump 78 may not be required and may not be included in thecore module 2. - In operation, a gaseous NG may be provided to the
core module 2 through theprimary gas inlet 4, which may be divided by thesplitter 6 into thecooling stream 14, theprocess stream 12, and thetransfer motive stream 16. Thecooling stream 14 may be directed from thesplitter 6 through the coolingfluid inlet 54 and then directed into theturbo compressor 56 to be compressed. Thecompressed cooling stream 14 may then exit theturbo compressor 56 and be directed into theambient heat exchanger 58, which may transfer heat from the coolingstream 14 to ambient air. Additionally, the coolingstream 14 may be directed through a first channel of theprimary heat exchanger 34, where it may be further cooled. - In some embodiments, the
primary heat exchanger 34 may comprise a high performance aluminum multi-pass plate and fin type heat exchanger, such as may be purchased from Chart Industries Inc., 1 Infinity Corporate Centre Drive, Suite 300, Garfield, Heights, Ohio 44125, or other well known manufacturers of such equipment. - After passing through the
primary heat exchanger 34, the coolingstream 14 may be expanded and cooled in theturbo expander 60. For example, theturbo expander 60 may comprise a turbo expander having a specific design for a mass flow rate, pressure level of gas, and temperature of gas to the inlet, such as may be purchased from GE Oil and Gas, 1333 West Loop South, Houston, Tex. 77027-9116, USA, or other well known manufacturers of such equipment. Additionally, the energy required to drive theturbo compressor 56 may be provided by theturbo expander 60, such as by theturbo expander 60 being directly connected to theturbo compressor 56 or by theturbo expander 60 driving an electrical generator (not shown) to produce electrical energy to drive an electrical motor (not shown) that may be connected to theturbo compressor 56. The cooledcooling stream 14 may then be directed through a second channel of theprimary heat exchanger 34 and then through the coolingfluid outlet 62 into themixer 10 to be directed out of thecore module 2 through theprimary gas outlet 8. - Meanwhile, a gaseous NG stream may be directed from the
splitter 6 into theNG inlet 32 to provide theprocess stream 12 to thecore module 2 and theprocess stream 12 may then be directed through a third channel of theprimary heat exchanger 34. Heat from theprocess stream 12 may be transferred to thecooling stream 14 within theprimary heat exchanger 34 and theprocess stream 12 may exit theprimary heat exchanger 34 in a cooled gaseous state. Theprocess stream 12 may then be directed through theexpansion valve 36, such as a Joule-Thomson expansion valve, wherein theprocess stream 12 may be expanded and cooled to form a liquid natural gas (LNG) portion and a gaseous NG portion. Additionally, carbon dioxide (CO2) that may be contained within theprocess stream 12 may become solidified and suspended within the LNG portion, as carbon dioxide has a higher freezing temperature than methane (CH4), which is the primary component of NG. The LNG portion and the gaseous portion may be directed into the gas-liquid separation tank 38, and the LNG portion may be directed out of theseparation tank 38 as aLNG process stream 12, which may then be directed into thetransfer tank 40. A transfermotive gas stream 16 may then be directed through the transfermotive gas inlet 64 from thesplitter 6 through thevalve 66, which may be utilized to regulate the pressure of the transfermotive gas stream 16 prior to being directed into thetransfer tank 40. The transfermotive gas stream 16 may facilitate the transfer of the liquidNG process stream 12 through thehydrocyclone 42, such as may be available, for example, from Krebs Engineering of Tucson, Ariz., wherein the solid CO2 may be separated from the liquidNG process stream 12. - Optionally, a
separate transfer tank 40 may not be used and instead a portion of theseparation tank 38 may be utilized as a transfer tank to transfer theprocess stream 12 into thehydrocyclone 42. In additional embodiments, a pump may be utilized to transfer the process stream from theseparation tank 38 into the hydrocyclone. A pump may provide certain advantages, as it may provide a constant system flow, when compared to a batch process utilizing a transfer tank. However, a transfer tank configuration, such as shown inFIG. 1 , may provide a morereliable process stream 12 flow. In yet further embodiments, a plurality oftransfer tanks 40 may be utilized; optionally, a plurality ofhydrocyclones 42 may also be utilized. Such a configuration may improve flow regularity of theprocess stream 12 through thecore module 2 while maintaining a reliable flow of theprocess stream 12. Additionally, an accumulator (not shown) may be provided and the transfermotive gas stream 16 may be accumulated in the accumulator prior to being directed into thetransfer tank 40 to facilitate an expedient transfer of theprocess stream 12 out of thetransfer tank 40 and through thehydrocyclone 42. - In the
hydrocyclone 42, a slurry including the solid CO2 from theLNG process stream 12 may be directed through anunderflow outlet 82 and theLNG process stream 12 may be directed through anoverflow outlet 84. TheLNG process stream 12 may then be directed through thefilter 44, which may remove any remaining CO2 or other impurities, which may be removed from the system through afilter outlet 86, such as during a cleaning process. In some embodiments, thefilter 44 may comprise one screen filter or a plurality of screen filters that are placed in parallel. A substantially pureLNG process stream 12, such as substantially pure liquid CH4, may then exit thefilter 44 and be directed into aLNG process stream 12 and a secondary LNG stream that may form thesecond tail stream 26. TheLNG process stream 12 may be directed through thevalve 48 and into thestorage tank 50, wherein it may be withdrawn for use through theLNG outlet 52, such as to a vehicle which is powered by LNG or into a transport vehicle. - Additionally, the CO2 slurry in the
hydrocyclone 42 may be directed through theunderflow outlet 82 to form the CO2 management stream 22 and be directed to the CO2 sublimation chamber 70 to sublimate the solid CO2 for removal from thecore module 2. Additionally, the separationchamber vent stream 18, the transfertank vent stream 20 and the storagetank vent stream 24 may be combined in themixer 74 to provide agas stream 28 that may be used to sublimate the CO2 management stream 22. Thegas stream 28 may be relatively cool upon exiting themixer 74 and may be directed through a fourth channel of theprimary heat exchanger 34 to extract heat from theprocess stream 12 in the third channel of theprimary heat exchanger 34. Thegas stream 28 may then be directed through thecompressor 76 to further pressurize and warm thegas stream 28 prior to directing thegas stream 28 into the CO2 sublimation chamber 70 to sublimate the CO2 of the CO2 management stream 22 from theunderflow outlet 82 of thehydrocyclone 42. In some embodiments, a heat exchanger, such as described in application Ser. No. 11/855,071, filed Sep. 13, 2007, titled Heat Exchanger and Associated Method, owned by the assignee of the present invention, the disclosure thereof previously incorporated by reference in its entirely herein, may be utilized as thesublimation chamber 70. In further embodiments, a portion of thegas stream 28, such as an excess flow portion, may be directed through a tee (not shown) and into themixer 10, rather than being directed into the CO2 sublimation chamber 70. - The combined gaseous CO2 from the CO2 management stream 22 and the gases from the
stream 28 may then exit thesublimation chamber 70 as the firsttail gas stream 30, which may be relatively cool. For example, the firsttail gas stream 30 may be just above the CO2 sublimation temperature upon exiting thesublimation chamber 70. The firsttail gas stream 30 may then be directed through a fifth channel of theprimary heat exchanger 34 to extract heat from theprocess stream 12 in the third channel prior to entering themixer 8 through the firsttail gas outlet 72 and being directed out of thecore module 2 through theprimary gas outlet 8. - Finally, the second
tail gas stream 26, which may initially comprise a secondary substantially pure LNG stream from thesplitter 46, may be directed through thepump 78. In additional embodiments, thepump 78 may not be required and may not be included in thecore module 2. For example, sufficient pressure may be imparted to theprocess stream 12 within thetransfer tank 40 by the transfermotive gas stream 16 such that thepump 78 may not be required and may not be included in thecore module 2. The secondtail gas stream 26 may then be directed through a sixth channel of theprimary heat exchanger 34, where it may extract heat from theprocess stream 12 in the third channel, and may become vaporized to form gaseous NG. Thesecond tail stream 26 may then be directed into themixer 10 via the secondtail gas outlet 80 and out of thecore module 2 through theprimary gas outlet 8. - In some embodiments, as the
process stream 12 progresses through theprimary heat exchanger 34, theprocess stream 12 may be cooled first by the coolingstream 14, which may extract about two-thirds (⅔) of the heat to be removed from theprocess stream 12 within theheat exchanger 34. Remaining cooling of theprocess stream 12 within theprimary heat exchanger 34 may then be accomplished by the transfer of heat from theprocess stream 12 to the secondtail gas stream 26. In view of this, the amount of flow that is directed into the secondtail gas stream 26 may be regulated to achieve a particular amount of heat extraction from theprocess stream 12 within theheat exchanger 34. - In some embodiments, the
core module 2 may be configured to utilize a desired site-independent predetermined inlet gas condition, such as a desired site-independent predetermined inlet pressure level and a desired site-independent predetermined inlet temperature level, for the source gas directed into theprimary gas inlet 4. In other words, thecore module 2 may be configured to receive a gas into theprimary gas inlet 4 at a pressure and temperature level that may each be selected independent of a specific source gas pressure and temperature at a site at which thecore module 2 is to be utilized. Additionally, thecore module 2 may be configured to utilize a desired site-independent predetermined outlet gas condition, such as a desired site-independent predetermined outlet pressure level and a desired site-independent predetermined outlet temperature level, for the tail gas directed out of theprimary gas outlet 8. - As the
core module 2 may be designed and manufactured independent of aspecific site 88, a modular type natural gas liquefaction plant for aspecific site 88 may include a customizedinlet module 90 and a customizedoutlet module 92 in addition to thepreconfigured core module 2, as shown inFIGS. 2 and 3 . Theinlet module 90 may include aninlet 94 to receive a source gas, such as gaseous NG, from thespecific site 88, such as from aNG supply pipeline 96, into theinlet module 90. Upon entering theinlet module 90 the source gas may be processed, such as by one or more of compression, expansion, cooling, heating, dehydration, and filtration using conventional methods and devices, to meet the site-independent predetermined inlet gas conditions for thecore module 2. The source gas may then be directed into theprimary gas inlet 4 of thecore module 2 at the site-independent predetermined inlet conditions, such as a site-independent predetermined temperature and pressure. - Additionally, the
outlet module 92 may be configured to receive the tail gas stream, including the combined firsttail gas stream 30, secondtail gas stream 26, and coolingstream 14, directed out of theprimary gas outlet 8 of thecore module 2. Upon entering theoutlet module 92 the tail gas stream may be processed, such as by one or more of compression, expansion, cooling, and heating using conventional methods and devices, to meet thesite 88 specific tail gas requirements. The tail gas may then be directed out of anoutlet 98 of theoutlet module 92 to a site-specific location at a site-specific pressure and temperature. For example, a site-specific location for the tail gas may be a relatively lowpressure NG pipeline 100, such as shown inFIG. 2 , and the tail gas may be processed to an appropriate relatively low pressure. For another example, the site-specific location for the tail gas may be the sameNG supply pipeline 96 that provides the NG source gas, such as shown inFIG. 3 , and the tail gases may require compression within the outlet module to provide the tail gas to thesupply pipeline 96 at an appropriate pressure. - In view of this approach to plant design and configuration, the
inlet module 90 and theoutlet module 92 may be configured to enable apreconfigured core module 2 to operate at any number of specific sites, which may each provide a source gas having different properties, such as gas composition, gas pressure, and gas temperature, and may have unique tail gas requirements. In some cases, one or more of the source gas conditions and the required tail gas conditions for a specific site may coincidentally meet one or more of the site-independent predetermined gas conditions for theprimary gas inlet 4 andprimary gas outlet 8 of thecore module 2. In such a case, one or more of theinlet module 90 and theoutlet module 92 may simply be configured as a gas conduit. - The
inlet module 90 and theoutlet module 92, allow aspecific site 88 to be adapted to thecore module 2, and thecore module 2 may be utilized at any number ofsites 88 with minimal or no internal modifications required. In view of the foregoing, acore module 2 may be mass produced and then delivered to numerous sites. - Although a common design between numerous
core modules 2 may not necessarily provide the most energy efficient system at every site, when compared to custom site-specific plants, a common design forcore module 2 may result in other efficiencies, improved safety, a reduction in engineering and design cost, a reduction in maintenance cost, improved reliability and a reduction in initial investment cost that may outweigh any inefficiencies that may exist at an individual site. - The
core module 2 may be configured with some flexibility in its mechanical design, such as shown inFIG. 1 , to allow accommodation of somewhat varying input and output temperatures and pressures without necessitating a replacement of any of the physical components of thecore module 2. However, the plant may be designed and configured for specific site-independent predetermined gas conditions for theprimary gas inlet 4 and the primary gas outlet 5 selected for efficiency. - Provided for example and not limitation, the
core module 2 may be configured to utilize an inlet pressure level of about 800 psia and a inlet temperature level of about 50° F. to about 120° F. Extensive modeling has suggested that approximately 800 psia may be the most efficient incoming pressure. Additionally, for example and not limitation, the desired predetermined specified outlet pressure level of thecore module 2 may be about 100 psia. In general, the lower the outlet pressure level, the higher the production rate. However, from studying location data the inventors of the present invention have discovered that ideal low pressure lines with enough available flow to accommodate tail gas from thecore module 2 are few and may be difficult to access. In view of this, as the designed tail gas outlet pressure of thecore module 2 is increased, more potential natural gas liquefaction plant sites become available. It is believed at the present time that selection of a 100 psia outlet pressure may be a good compromise between the relatively few sites with available lower pressure pipelines and the more readily available sites with available higher pressure pipelines. This may also be a good outlet pressure to provide to anoutlet module 92 having a compressor to increase the gas pressure for a higher pressure pipeline, as it may result in a relatively low compression ratio. Lower compression ratios require less power and may be more economical. Furthermore, an outlet or exit pressure of about 100 psia may provide efficiencies for thecooling stream 14 of thecore module 2, since a higher gas pressure may result in a lower critical temperature for certain components of the gas, such as CO2, which may allow thecooling stream 14 to reach a lower temperature. - While these may be desired pressure levels and temperature levels for the
core module 2, such may vary without substantially impacting the operation of thecore module 2 because thecore module 2 described herein has the flexibility to accommodate such varying conditions of inlet gas pressure level and temperature level as well as outlet gas pressure level therefrom. - In additional embodiments, the
core module 2 may not include theprimary gas inlet 4, thesplitter 6, theprimary gas outlet 8 and themixer 10. Instead, the inlet gas streams 12, 14, 16 may be maintained separately and the outlet gas streams 14, 26, 30 may also be maintained separately, which may provide a moreflexible core module 2, such as described in U.S. patent application Ser. No. ______, filed on even date herewith, for METHODS OF NATURAL GAS LIQUEFACTION AND NATURAL GAS LIQUEFACTION PLANTS UTILIZING MULTIPLE AND VARYING GAS STREAMS (Attorney Docket No. 2939-9179US (BA-350)), previously incorporated by reference herein in its entirety. - The
core module 2 may have a relatively small physical size and may be readily transported from one geographic location to another. Such a compact design may allowcore modules 2 to be mass produced at one or more locations and transported to various sites, such as by conventional rail and roadway transport. Furthermore, the mass production ofcore modules 2 may allow components to be purchased and manufactured in relatively high numbers, which may reduce the cost of components and may make it economically feasible to design unique and especially efficient components for thecore module 2. Mass production may result in replacement components being relatively inexpensive, resulting in lower maintenance cost. Furthermore, if acore module 2 at a site became damaged and required extensive repair or replacement, the damagedcore module 2 could be replaced with another substantiallyidentical core module 2 that is operable relatively quickly and cost effectively. Additional and various other advantages may also result from the mass production of substantiallyidentical core modules 2. - Modular LNG plants utilizing substantially
identical core modules 2 may also be utilized to more efficiently and cost effectively distribute LNG. It may be relatively expensive to ship LNG from a large plant, such as by truck, to each point-of-use location where it is required. It may also be relatively expensive and difficult to provide infrastructure, such as a LNG pipeline, to transport LNG from a large plant to various distant locations. However, a plurality of modular LNG plants utilizing substantiallyidentical core modules 2 may be located at or near various LNG point-of-use locations, such as LNG vehicle fueling stations, having existing gaseous NG sources, which may have various and different pressures and temperatures, and produce LNG from the gaseous NG sources at or near the LNG point-of-use locations. In view of this, existing gaseous NG infrastructure may be utilized withcore modules 2 according to the present invention to distribute LNG in a relatively efficient and cost effective manner. - In some embodiments, the
core module 2 may be configured as a “small-scale” natural gasliquefaction core module 2 which is coupled to a source of natural gas such as apipeline 96, although other sources, such as a well head, are contemplated as being equally suitable. The term “small-scale” is used to differentiate from a larger-scale plant having the capacity of producing, for example 70,000 gallons of LNG or more per day. In comparison, the presently disclosed liquefaction plant may have a capacity of producing, for example, approximately 30,000 gallons of LNG a day but may be scaled for a different output as needed and is not limited to small-scale operations or plants. Additionally, theliquefaction core module 2 of the present invention may be considerably smaller in size than a large-scale plant and may be transported from one site to another, as previously described herein. However, thecore module 2 may also be configured as a large-scale plant if desired. Acore module 2 may also be relatively inexpensive to build and operate, and may be configured to require little or no operator oversight. - In further embodiments, a plurality of
core modules 2 may be utilized at a single site, such as at sites that have a relatively large LNG demand, sites having variable demand or at critical demand sites. In some embodiments, a site having a relatively high LNG demand may include a plurality ofcore modules 2, each producing LNG simultaneously to meet the demand. Provided for example and not limitation, a site having a LNG demand of about 120,000 gallons a day may utilize four substantiallyidentical core modules 2, each configured to produce about 30,000 gallons of LNG a day. Additionally, the site may include one or more additional substantiallyidentical core modules 2, which may be rotated into use at the site, which may allowindividual core modules 2 to be shut down for cleaning, servicing or repairs whilebackup core modules 2 are utilized to make up for the lost LNG production, thus allowing the LNG demand to be met at all times. If a site has a particularly critical LNG demand, a greater redundancy incore modules 2, and thus backup LNG production capacity, may be provided. Additionally, if a site has variable demand, as demand increasesadditional core modules 2 at the site may be activated and utilized to meet the increased demand, likewise, theadditional core modules 2 may be deactivated as demand decreases. - In additional embodiments,
core modules 2 may be designed in several sizes or capacities, and core modules having different sizes and capacities may be combined in various combinations to meet any particular sites LNG demand. - The
core module 2 and methods illustrated and described herein may include the use of any well known apparatus and methods, such as within theinlet module 90, to remove carbon dioxide, nitrogen, oxygen, ethane, etc. from the natural gas supply before entry into thecore module 2. Additionally, if the source of natural gas has little carbon dioxide, nitrogen, oxygen, ethane, etc., the use of hydrocyclones and carbon dioxide sublimation in the liquefaction process andcore module 2 may not be needed and may not be included. - While the invention may be susceptible to various modifications and alternative forms, specific embodiments have been shown by way of example in the drawings and have been described in detail herein. However, it should be understood that the invention is not intended to be limited to the particular forms disclosed. Rather, the invention includes all modifications, equivalents, and alternatives falling within the scope of the invention as defined by the following appended claims.
Claims (23)
Priority Applications (5)
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US12/604,139 US20110094261A1 (en) | 2009-10-22 | 2009-10-22 | Natural gas liquefaction core modules, plants including same and related methods |
CN2010800479410A CN102667380A (en) | 2009-10-22 | 2010-08-12 | Natural gas liquefaction core modules, plants including same and related methods |
PCT/US2010/045332 WO2011049665A1 (en) | 2009-10-22 | 2010-08-12 | Natural gas liquefaction core modules, plants including same and related methods |
MX2012003663A MX2012003663A (en) | 2009-10-22 | 2010-08-12 | Natural gas liquefaction core modules, plants including same and related methods. |
CA2775450A CA2775450A1 (en) | 2009-10-22 | 2010-08-12 | Natural gas liquefaction core modules, plants including same and related methods |
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US12/604,139 US20110094261A1 (en) | 2009-10-22 | 2009-10-22 | Natural gas liquefaction core modules, plants including same and related methods |
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US12/604,139 Abandoned US20110094261A1 (en) | 2009-10-22 | 2009-10-22 | Natural gas liquefaction core modules, plants including same and related methods |
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US (1) | US20110094261A1 (en) |
CN (1) | CN102667380A (en) |
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US10655911B2 (en) | 2012-06-20 | 2020-05-19 | Battelle Energy Alliance, Llc | Natural gas liquefaction employing independent refrigerant path |
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WO2018096187A2 (en) | 2017-02-14 | 2018-05-31 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Lng production system equipped with recondenser |
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US11911732B2 (en) | 2020-04-03 | 2024-02-27 | Nublu Innovations, Llc | Oilfield deep well processing and injection facility and methods |
Also Published As
Publication number | Publication date |
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CN102667380A (en) | 2012-09-12 |
WO2011049665A1 (en) | 2011-04-28 |
CA2775450A1 (en) | 2011-04-28 |
MX2012003663A (en) | 2012-05-08 |
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