GB2504765A - Waste heat recovery from micro LNG plant - Google Patents

Waste heat recovery from micro LNG plant Download PDF

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Publication number
GB2504765A
GB2504765A GB201214282A GB201214282A GB2504765A GB 2504765 A GB2504765 A GB 2504765A GB 201214282 A GB201214282 A GB 201214282A GB 201214282 A GB201214282 A GB 201214282A GB 2504765 A GB2504765 A GB 2504765A
Authority
GB
United Kingdom
Prior art keywords
lng
waste heat
production
micro
lng plant
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.)
Withdrawn
Application number
GB201214282A
Other versions
GB201214282D0 (en
Inventor
Kevin Peakman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde AG
Original Assignee
Linde AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Linde AG filed Critical Linde AG
Priority to GB201214282A priority Critical patent/GB2504765A/en
Publication of GB201214282D0 publication Critical patent/GB201214282D0/en
Publication of GB2504765A publication Critical patent/GB2504765A/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022Hydrocarbons, e.g. natural gas
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003Processes 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
    • F25J1/0047Processes 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
    • F25J1/0052Processes 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02Processes 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
    • F25J1/0211Processes 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
    • F25J1/0212Processes 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02Processes 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
    • F25J1/0225Processes 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 other external refrigeration means not provided before, e.g. heat driven absorption chillers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02Processes 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
    • F25J1/0225Processes 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 other external refrigeration means not provided before, e.g. heat driven absorption chillers
    • F25J1/0227Processes 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 other external refrigeration means not provided before, e.g. heat driven absorption chillers within a refrigeration cascade
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02Processes 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
    • F25J1/0228Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0235Heat exchange integration
    • F25J1/0242Waste heat recovery, e.g. from heat of compression
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02Processes 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
    • F25J1/0243Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0262Details of the cold heat exchange system
    • F25J1/0264Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams
    • F25J1/0265Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer
    • F25J1/0268Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer using a dedicated refrigeration means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00Refrigeration techniques used
    • F25J2270/90External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
    • F25J2270/906External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by heat driven absorption chillers

Abstract

The waste heat from a micro LNG plant 20 is collected for use in the LNG production process. The collected waste heat may be coupled with absorption refrigeration equipment 30 to pre-chill or precool the natural gas 10 and the mixed refrigerant gas used in the liquefaction process. By using the waste heat in this manner, the operating costs of the LNG plant 20 can be reduced. The energy consumed for a set level of production is reduced or production can be increased for the same level of energy consumption by using the invention.

Description

Waste Heat Recovery From Micro LNG Plant

FiELD OF THE INVENTION

(001) The invention relates to micro liquefied natural gas (LNG) plants and to the recovery of waste heat from the plant.

BACKGROUND OF THE INVENTION

(002) LNG is predominantly methane that has been converted from gas to liquid form for ease of storage and transportation. This is because LNG takes up about 1/600th the volume of natural gas in the gaseous state.

(003) A typical process for obtaining LNG comprises transporting raw natural gas to the plant where it is processed to remove impurity gases, such as C02, H2S, and condensates such as water, oil, mud, and any trace amounts of mercury. Once purified, the natural gas is S..

cooled down in stages and condensed until liquefied. The resulting LNG is stored in tanks * . " ready for shipment to market S. S * * .* (004) Many LNG plants are very large, processing more than a million tons of LNG per year. These LNG plants are often located in relatively remote area for safety reasons and therefore the cost of transport to and from the plant is significant. Small scale LNG plants (with LNG production of 150 to 500 tons per day) have the advantageous of compact size that enables production of LNG close to the location where it will be used, thus reducing the transportation costs. In addition, small scale LNG plants have the advantage of allowing balancing of the availability of natural gas during high and low periods of dcmand.

(005) Micro LNG plants (with LNG production of less than 100 tons per day and oftcn in the range of 25 to 50 tons per day) provide advantages for smaller scale industrial needs by allowing small scale LNG production on site with the ability to meet variable demand.

(006) . At various stages of the production of LNG, waste heat from the process is vented to the atmosphere, either directly or via cooling towers. This waste heat is generally produced by power generating equipment used in the plant. This practice wastes the potential energy that could be recovered from the heat and that could be used for other purposes.

(007) There is a need in the art for improvements to micro LNO plant design and operation.

SUMMARY OF THE INVENTION

(008) The invention provides a system for recovering waste heat from a micro LNG plant.

BRTEF DESCJP1T ION OF THE DRAWING (009) The drawing figure is a schematic diagram of a micro LNG plant according to the invention. * . . * ..

* DETAILED DESC RIPTION OF THE INVENTION * .. * S S

* : (010) The invention is directed to improvements to micro LNG plants. Micro scale LNG *.

plants are important production tools for industry in providing on demand, on site LNG while *.j" minimizing distribution costs. As noted, waste heat from the micro LNG plant is vented *:i either directly to the atmosphere or through cooling towers, thus wasting the potential energy available from such waste heat. The invention overcomes this disadvantage by providing means to recover the heat that then use the captured heat for LNG production processes. In particular, heat recovery equipment is used to recover the waste heat and may be coupled with absorption refrigeration equipment to pre-chill the natural gas and the mixed refrigerant gas used in the liqucfaction proccss. This use of waste heat provides a reduction of operating costs for the same through put of natural gas or for increased production of LNG for the same energy input. In other words, the specific power need for producing LNG is reduced by the invention.

(011) The invention will be described in greater detail with reference to the drawing figure.

In the figure, natural gas is provided from a natural gas source 10 to LNG processing equipment 20, such as an amine and dryer unit. Waste heat generated by the processing equipment 20 is captured and routed through an absorption refrigeration unit 30 that can be used to pre-chull a cold box 40 used in the LNG production. LNG that is produced in the plant can be stored in LNG storage tank 50. Alternatively, the absorption refrigeration unit 30 can be used to pre-chill the natural gas supply and thereby offset a reduction in natural gas supply pressure while maintaining production output.

(012) The invention provides significant advantages for micro LNG plants. The energy consumed for a set level of production is reduced or production can be increased.for the same level of energy consumption. This leads of overall reduction of plant operating costs.

(013) While the invention has been described with reference to the recovery of waste heat from a micro LNG plant, the invention is applicable to other cryogenic production plants that use turbo compressors or power generation equipment that exhaust waste hcat.

(014) It will be understood that the embodiments described herein are merely exemplary and :.: that one skilled in the art may make variations and modifications without departing from the : spirit and scope of the present invention. All such variations and modifications are intended to be included within the scope of the invention as described above. Further, all embodiments * disclosed are not necessarily in the alternative, as various embodiments of the invention may be combined to provide the desired result. *.* *... * * * * "

GB201214282A 2012-08-09 2012-08-09 Waste heat recovery from micro LNG plant Withdrawn GB2504765A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB201214282A GB2504765A (en) 2012-08-09 2012-08-09 Waste heat recovery from micro LNG plant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB201214282A GB2504765A (en) 2012-08-09 2012-08-09 Waste heat recovery from micro LNG plant

Publications (2)

Publication Number Publication Date
GB201214282D0 GB201214282D0 (en) 2012-09-26
GB2504765A true GB2504765A (en) 2014-02-12

Family

ID=46981340

Family Applications (1)

Application Number Title Priority Date Filing Date
GB201214282A Withdrawn GB2504765A (en) 2012-08-09 2012-08-09 Waste heat recovery from micro LNG plant

Country Status (1)

Country Link
GB (1) GB2504765A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188408A (en) * 1986-03-24 1987-09-30 Air Prod & Chem Low pressure process for c3-c5 liquid hydrocarbons recovery from process product gas
EP0360229A2 (en) * 1988-09-23 1990-03-28 Air Products And Chemicals, Inc. Natural gas liquefaction process using low level, high level and absorption refrigeration cycles
EP1205721A1 (en) * 2000-11-02 2002-05-15 Air Products And Chemicals, Inc. A process and apparatus for the production of a liquid cryogen
EP1813889A1 (en) * 2004-11-15 2007-08-01 Mayekawa Mfg. Co., Ltd. Cryogenic liquefying refrigerating method and device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188408A (en) * 1986-03-24 1987-09-30 Air Prod & Chem Low pressure process for c3-c5 liquid hydrocarbons recovery from process product gas
EP0360229A2 (en) * 1988-09-23 1990-03-28 Air Products And Chemicals, Inc. Natural gas liquefaction process using low level, high level and absorption refrigeration cycles
EP1205721A1 (en) * 2000-11-02 2002-05-15 Air Products And Chemicals, Inc. A process and apparatus for the production of a liquid cryogen
EP1813889A1 (en) * 2004-11-15 2007-08-01 Mayekawa Mfg. Co., Ltd. Cryogenic liquefying refrigerating method and device

Also Published As

Publication number Publication date
GB201214282D0 (en) 2012-09-26

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