WO2017194604A1 - Method for removing water from natural gas - Google Patents

Method for removing water from natural gas Download PDF

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Publication number
WO2017194604A1
WO2017194604A1 PCT/EP2017/061178 EP2017061178W WO2017194604A1 WO 2017194604 A1 WO2017194604 A1 WO 2017194604A1 EP 2017061178 W EP2017061178 W EP 2017061178W WO 2017194604 A1 WO2017194604 A1 WO 2017194604A1
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WIPO (PCT)
Prior art keywords
natural gas
fed
water
bed
expansion turbine
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.)
Ceased
Application number
PCT/EP2017/061178
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French (fr)
Inventor
Theo Martin
Arthur Zhang
Yuwu Wang
Xiangxiang SHAO
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Linde GmbH
Original Assignee
Linde GmbH
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Filing date
Publication date
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Publication of WO2017194604A1 publication Critical patent/WO2017194604A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
    • C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
    • C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
    • C10L3/10—Working-up natural gas or synthetic natural gas
    • C10L3/101—Removal of contaminants
    • C10L3/106—Removal of contaminants of water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
    • B01D53/0462—Temperature swing adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/28—Selection of materials for use as drying agents
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B01D2253/108—Zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/116—Molecular sieves other than zeolites
    • 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
    • F25J2205/60—Processes or apparatus using other separation and/or other processing means using adsorption on solid adsorbents, e.g. by temperature-swing adsorption [TSA] at the hot or cold end
    • 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
    • F25J2220/68—Separating water or hydrates

Definitions

  • the present invention relates to methods for removing water from natural gas. Technological background of the present invention
  • Natural gas is normally transported from supply stations to end users at higher pressures of 50 bar to 100 bar. This higher pressure gas must be depressurized in regulator stations prior to being used by the end users. The energy generated by this pressure release in the regulator stations is normally wasted. If fed to expansion turbines, the energy could be utilized for power generation.
  • the temperature of the gas After expansion of the gas, the temperature of the gas will drop below 0°C. In order to avoid water in the natural gas from icing after expansion, the natural gas needs to be preheated before being fed to the expansion turbines.
  • an object of the present invention is to overcome the limitations and problems that earlier methods have experienced.
  • the present invention basically provides for removing water by feeding the natural gas to at least one molecular sieve prior to the natural gas being fed to the expansion turbines thereby removing the need to preheat the natural gas.
  • This preheating of the natural gas several advantages are realized. With no preheating, thermal energy is saved. The overall economics are improved and the process is less complicated. Further, there is no cold energy captured after expansion.
  • a method for removing water from natural gas is disclosed. Water is removed from the natural gas before it is fed to an expansion turbine, in particular by passing the natural gas through at least one molecular sieve.
  • the energy that results from the expansion of the natural gas can be used in refrigeration or other activity, and the natural gas can be fed to storage or an appropriate end use.
  • a method of feeding natural gas to an expansion turbine to generate energy comprising removing water from the natural gas before the natural gas is fed to the expansion turbine.
  • a method for inhibiting formation of ice in a natural gas stream prior to the natural gas stream being fed to an expansion turbine comprising removing water from the natural gas stream, in particular by feeding the natural gas stream through at least one molecular sieve.
  • the natural gas that is treated may advantageously be at a purity of more than ninety percent methane.
  • the amount of water in the natural gas may expediently range from about 30 mg/m 3 to about 70 mg/m 3 .
  • the molecular sieve material may favourably be any molecular sieve material that can adsorb water.
  • Typical molecular sieve materials may preferably be selected from the group consisting of zeolites such as type 3A, 5A, ZSM-5 and 13X.
  • the molecular sieve may advantageously be contained in an adsorbent bed or adsorption bed which can expediently comprise at least one adsorbent bed, and more preferably two adsorbent beds.
  • This adsorption process can favourably be a cyclical process that is preferably a temperature swing adsorption (TSA) process.
  • TSA temperature swing adsorption
  • the natural gas when fed into the adsorption process may preferably be at a pressure from about 50 bar to about 100 bar.
  • the resulting natural gas which is free from water may typically be at ambient temperature and/or may typically be at a pressure of about 50 bar to about 100 bar.
  • the expansion turbine may advantageously be a typical expansion turbine that will produce energy from a gas feed.
  • the energy generated by the expansion turbine can expediently be fed to a generator where the output of the generator can favourably be used for refrigeration or dry ice production.
  • the natural gas that is recovered from the expansion turbine can preferably be fed its intended to storage depending upon the operator's needs.
  • FIG. 1 shows a schematic of a process of the present invention for removing water from a natural gas stream prior to the natural gas stream being fed to an expansion turbine.
  • FIG. 1 a schematic showing a process for removing water from natural gas prior to it being fed to an expansion turbine, according to the present invention is described.
  • Natural gas which is typically ninety percent methane is fed through line 1 to adsorbent beds A and B.
  • the natural gas stream will typically contain water in an amount ranging from 30 mg/m 3 to 70 mg/ 3 .
  • the natural gas is split between two lines 2 and 3 which feed the natural gas containing the water to the molecular sieve containing beds A and B respectively depending upon the step of the cycle.
  • the molecular sieve material will adsorb water in the beds A and B and the now water-free natural gas will be fed to lines 4 and 5 from beds A and B respectively depending upon the step in the adsorption cycle to line 6.
  • the adsorbent material in the beds A and B will be a zeolite such as a 3A, 5A, ZSM-5 or 13X type zeolite.
  • the preferred adsorption cycle is a temperature swing adsorption (TSA) cycle.
  • TSA temperature swing adsorption
  • the methane gas stream containing the contaminant water is passed through the first bed A through the feed of natural gas 1 to line 2 where water is adsorbed on the adsorbent material present in the bed A.
  • the gas stream being treated is typically at ambient temperatures and will be at a feed pressure of 50 bar to 100 bar.
  • water-free natural gas is fed through line 4 to line 6 for entry into the expansion turbine C.
  • the feed stream of natural gas containing water switches to line 3 and the second bed B where water will be adsorbed on the adsorbent material present therein.
  • bed A will be raised by purging with a hot inert gas stream through line 4. This will desorb water from the adsorbent material in bed A while bed B is undergoing the adsorption step and producing water-free natural gas which is fed through line 5 to line 6 and into the expansion turbine C.
  • bed B When bed B is near breakthrough, feed of the natural gas stream is stopped in line 3 and its flow is diverted into bed A again through line 2 where the adsorption cycle begins anew. Bed B is then subjected to a hot inert gas stream feed through line 5 which will desorb the water from the adsorbent material in bed B and preparing it to again receive natural gas for treatment.
  • the water-free natural gas stream produced by either bed A or bed B which is at a pressure of about 50 bar to about 100 bar and ambient temperature will be fed through line 6 to the expansion turbine C where it will be expanded and the energy produced by this expansion will be captured and fed through line 8 to a generator D.
  • the natural gas can be significantly reduced in temperature without any icing occurring due to the removal of the water by the inventive methods.
  • the natural gas which is now at temperatures as low as -50°C once it has been through the expansion turbine is fed through line 9 to a process requiring natural gas chosen by the operator or to a storage unit.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Separation Of Gases By Adsorption (AREA)

Abstract

In order to overcome the limitations and problems that earlier methods have experienced a method of feeding natural gas to an expansion turbine (C) to generate energy is proposed, said method comprising removing water from the natural gas before the natural gas is fed to the expansion turbine (C). A corresponding method for inhibiting formation of ice in a natural gas stream prior to the natural gas stream being fed to an expansion turbine (C) is also proposed, said method comprising removing water from the natural gas stream.

Description

M E T H O D F O R R E M O V I N G W A T E R F R O M N A T U R A L G A S
Technical field of the present invention
The present invention relates to methods for removing water from natural gas. Technological background of the present invention
Natural gas is normally transported from supply stations to end users at higher pressures of 50 bar to 100 bar. This higher pressure gas must be depressurized in regulator stations prior to being used by the end users. The energy generated by this pressure release in the regulator stations is normally wasted. If fed to expansion turbines, the energy could be utilized for power generation.
After expansion of the gas, the temperature of the gas will drop below 0°C. In order to avoid water in the natural gas from icing after expansion, the natural gas needs to be preheated before being fed to the expansion turbines.
Disclosure of the present invention: object, solution, advantages
Starting from the disadvantages and shortcomings as described above as well as taking the prior art as discussed into account, an object of the present invention is to overcome the limitations and problems that earlier methods have experienced.
These objects are accomplished by a method comprising the features of claim 1 as well as by a method comprising the features of claim 5. Advantageous embodiments and expedient improvements of the present invention are disclosed in the respective dependent claims.
The present invention basically provides for removing water by feeding the natural gas to at least one molecular sieve prior to the natural gas being fed to the expansion turbines thereby removing the need to preheat the natural gas. By avoiding this preheating of the natural gas, several advantages are realized. With no preheating, thermal energy is saved. The overall economics are improved and the process is less complicated. Further, there is no cold energy captured after expansion.
Basically, a method for removing water from natural gas is disclosed. Water is removed from the natural gas before it is fed to an expansion turbine, in particular by passing the natural gas through at least one molecular sieve.
This will inhibit ice formation in the natural gas stream after it has been expanded in the expansion turbine so that additional heat need not be applied.
The energy that results from the expansion of the natural gas can be used in refrigeration or other activity, and the natural gas can be fed to storage or an appropriate end use.
In one embodiment of the present invention, there is disclosed a method of feeding natural gas to an expansion turbine to generate energy comprising removing water from the natural gas before the natural gas is fed to the expansion turbine.
In a second embodiment of the present invention, there is disclosed a method for inhibiting formation of ice in a natural gas stream prior to the natural gas stream being fed to an expansion turbine comprising removing water from the natural gas stream, in particular by feeding the natural gas stream through at least one molecular sieve.
The natural gas that is treated may advantageously be at a purity of more than ninety percent methane.
The amount of water in the natural gas may expediently range from about 30 mg/m3 to about 70 mg/m3.
The molecular sieve material may favourably be any molecular sieve material that can adsorb water. Typical molecular sieve materials may preferably be selected from the group consisting of zeolites such as type 3A, 5A, ZSM-5 and 13X.
The molecular sieve may advantageously be contained in an adsorbent bed or adsorption bed which can expediently comprise at least one adsorbent bed, and more preferably two adsorbent beds. This adsorption process can favourably be a cyclical process that is preferably a temperature swing adsorption (TSA) process.
The natural gas when fed into the adsorption process may preferably be at a pressure from about 50 bar to about 100 bar.
After the natural gas has been subjected to the adsorption process, the resulting natural gas which is free from water may typically be at ambient temperature and/or may typically be at a pressure of about 50 bar to about 100 bar.
The expansion turbine may advantageously be a typical expansion turbine that will produce energy from a gas feed. The energy generated by the expansion turbine can expediently be fed to a generator where the output of the generator can favourably be used for refrigeration or dry ice production. The natural gas that is recovered from the expansion turbine can preferably be fed its intended to storage depending upon the operator's needs. Brief description of the drawing
For a more complete understanding of the present inventive embodiment disclosures and as already discussed above, there are several options to embody as well as to improve the teaching of the present invention in an advantageous manner. To this aim, reference may be made to the claims dependent on claim 1 and on claim 5; further improvements, features and advantages of the present invention are explained below in more detail with reference to the following description of a preferred embodiment by way of non-limiting example and to the appended drawing figure taken in conjunction with the description of the embodiments, of which: FIG. 1 shows a schematic of a process of the present invention for removing water from a natural gas stream prior to the natural gas stream being fed to an expansion turbine.
Detailed description of the drawings; best way of embodying the present invention
Before explaining the present inventive embodiment in detail, it is to be understood that the embodiment is not limited in its application to the details of construction and arrangement of parts illustrated in the accompanying drawing, since the present invention is capable of other embodiments and of being practiced or carried out in various ways. Also, it is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation.
In the following description, terms such a horizontal, upright, vertical, above, below, beneath and the like, are used solely for the purpose of clarity illustrating the invention and should not be taken as words of limitation. The drawings are for the purpose of illustrating the invention and are not intended to be to scale.
Turning to FIG. 1 , a schematic showing a process for removing water from natural gas prior to it being fed to an expansion turbine, according to the present invention is described.
Natural gas which is typically ninety percent methane is fed through line 1 to adsorbent beds A and B. The natural gas stream will typically contain water in an amount ranging from 30 mg/m3 to 70 mg/3.
The natural gas is split between two lines 2 and 3 which feed the natural gas containing the water to the molecular sieve containing beds A and B respectively depending upon the step of the cycle.
The molecular sieve material will adsorb water in the beds A and B and the now water-free natural gas will be fed to lines 4 and 5 from beds A and B respectively depending upon the step in the adsorption cycle to line 6. Typically the adsorbent material in the beds A and B will be a zeolite such as a 3A, 5A, ZSM-5 or 13X type zeolite.
The preferred adsorption cycle is a temperature swing adsorption (TSA) cycle. Typically the methane gas stream containing the contaminant water is passed through the first bed A through the feed of natural gas 1 to line 2 where water is adsorbed on the adsorbent material present in the bed A. The gas stream being treated is typically at ambient temperatures and will be at a feed pressure of 50 bar to 100 bar.
Once adsorption is complete as determined by measuring breakthrough, water-free natural gas is fed through line 4 to line 6 for entry into the expansion turbine C. The feed stream of natural gas containing water switches to line 3 and the second bed B where water will be adsorbed on the adsorbent material present therein.
The temperature of bed A will be raised by purging with a hot inert gas stream through line 4. This will desorb water from the adsorbent material in bed A while bed B is undergoing the adsorption step and producing water-free natural gas which is fed through line 5 to line 6 and into the expansion turbine C.
When bed B is near breakthrough, feed of the natural gas stream is stopped in line 3 and its flow is diverted into bed A again through line 2 where the adsorption cycle begins anew. Bed B is then subjected to a hot inert gas stream feed through line 5 which will desorb the water from the adsorbent material in bed B and preparing it to again receive natural gas for treatment.
The water-free natural gas stream produced by either bed A or bed B which is at a pressure of about 50 bar to about 100 bar and ambient temperature will be fed through line 6 to the expansion turbine C where it will be expanded and the energy produced by this expansion will be captured and fed through line 8 to a generator D. The natural gas can be significantly reduced in temperature without any icing occurring due to the removal of the water by the inventive methods.
The natural gas which is now at temperatures as low as -50°C once it has been through the expansion turbine is fed through line 9 to a process requiring natural gas chosen by the operator or to a storage unit.
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 invention. All such variations and modifications are intended to be included within the scope of the invention as described and claimed herein. Further, all embodiments disclosed are not necessarily in the alternative, as various embodiments of the invention may be combined to provide the desired result. List of reference signs
1 line for water-containing natural gas
2 line for water-containing natural gas to adsorbent bed or adsorption bed A
3 line for water-containing natural gas to second adsorbent bed or adsorption bed B
4 line for water-free natural gas from adsorbent bed or adsorption bed A
5 line for water-free natural gas from second adsorbent bed or adsorption bed B
6 line for water-free natural gas to expansion turbine C
8 line for energy from expansion turbine C to generator D
9 line for natural gas from expansion turbine C
A adsorbent bed or adsorption bed, in particular first adsorbent bed or first adsorption bed, of molecular sieve or molecule sieve
B second adsorbent bed or second adsorption bed, of molecular sieve or molecule sieve
C expansion turbine
D generator

Claims

Claims
1. A method of feeding natural gas to an expansion turbine (C) to generate energy, said method comprising removing water from the natural gas before the natural gas is fed to the expansion turbine (C).
The method according to claim 1 wherein the energy generated is fed to a generator (D).
The method according to claim 2 wherein power is created by the generator (D) and is used for refrigeration or dry ice production.
The method according to at least one of claims 1 to 3 wherein the water is removed using at least one molecular sieve.
A method for inhibiting formation of ice in a natural gas stream prior to the natural gas stream being fed to an expansion turbine (C), said method comprising removing water from the natural gas stream.
6. The method according to claim 5 wherein energy created by the expansion turbine (C) is fed to a generator (D).
7. The method according to claim 6 wherein power is created by the generator (D) and is used for refrigeration or dry ice production.
8. The method according to at least one of claims 5 to 7 wherein the water is removed by feeding the natural gas stream through at least one molecular sieve.
9. The method according to claim 4 or 8 wherein the at least one molecular sieve is selected from the group consisting of zeolite type 3A, 5A, ZSM-5 and 13X.
10. The method according to claim 4 or 8 or 9 wherein the at least one molecular sieve is present in at least one adsorbent bed or adsorption bed (A, B) or wherein the at least one molecular sieve contains at least one adsorbent bed or adsorption bed (A, B).
1 1. The method according to claim 10 wherein the at least one adsorbent bed or absorption bed (A, B) is used in a cyclical process.
12. The method according to claim 1 1 wherein the cyclical process is a temperature swing adsorption (TSA) process.
13. The method according to at least one of claims 10 to 12 wherein the natural gas is fed to the at least one adsorption bed (A, B) at a pressure of about 50 bar to about 100 bar.
14. The method according to at least one of claims 1 to 13 wherein the natural gas comprises more than ninety percent methane.
15. The method according to at least one of claims 1 to 14 wherein the water ranges from about 30 mg/m3 to about 70 mg/m3 in the natural gas.
PCT/EP2017/061178 2016-05-10 2017-05-10 Method for removing water from natural gas Ceased WO2017194604A1 (en)

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CN201610304278.7A CN107353954A (en) 2016-05-10 2016-05-10 The method that water removal is gone from natural gas

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CN113310281A (en) * 2021-06-15 2021-08-27 中国科学院理化技术研究所 Liquid air production device utilizing LNG cold energy
CN114791087A (en) * 2022-05-20 2022-07-26 大庆高浮科技开发有限公司 Natural gas pressure regulating system

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