WO2017053385A1 - A method of gas recovery from gas vents - Google Patents

A method of gas recovery from gas vents Download PDF

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Publication number
WO2017053385A1
WO2017053385A1 PCT/US2016/052818 US2016052818W WO2017053385A1 WO 2017053385 A1 WO2017053385 A1 WO 2017053385A1 US 2016052818 W US2016052818 W US 2016052818W WO 2017053385 A1 WO2017053385 A1 WO 2017053385A1
Authority
WO
WIPO (PCT)
Prior art keywords
vapor recovery
gas
phase fluid
gas stream
compressed gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2016/052818
Other languages
French (fr)
Inventor
Rozalia PAPP
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Air Liquide Industrial US LP
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Air Liquide Industrial US LP
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 Air Liquide SA, LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude, Air Liquide Industrial US LP filed Critical Air Liquide SA
Priority to JP2018513632A priority Critical patent/JP2018532959A/en
Publication of WO2017053385A1 publication Critical patent/WO2017053385A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0036—Flash degasification
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0068—General arrangements, e.g. flowsheets
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B21/00—Nitrogen; Compounds thereof
    • C01B21/04—Purification or separation of nitrogen
    • C01B21/0405—Purification or separation processes
    • C01B21/0433—Physical processing only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/08—Pipe-line systems for liquids or viscous products
    • F17D1/082—Pipe-line systems for liquids or viscous products for cold fluids, e.g. liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0012—Primary atmospheric gases, e.g. air
    • F25J1/0015—Nitrogen
    • 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
    • F25J1/0012—Primary atmospheric gases, e.g. air
    • F25J1/0017—Oxygen
    • 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
    • F25J1/0012—Primary atmospheric gases, e.g. air
    • F25J1/002—Argon
    • 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
    • F25J1/0027—Oxides of carbon, e.g. CO2

Definitions

  • cryovents keep-full, keep-cold, gas vents, or vapor vents. In this document, these devices will be referred to as vapor vents.
  • vapor vents are mechanical venting mechanisms that have a mechanical float that allows gas to exit when the liquid level drops. If these vapor vents are properly located, and properly functioning, they will maintain a liquid fluid flow through the pipeline.
  • the vapor that is released from these vapor vents is simply vented to the atmosphere. In some cases, it is desirable to capture and possibly recirculate this vapor.
  • a method of vapor recovery includes providing a combined gas phase and liquid phase fluid, by way of a pipe, wherein the pipe comprises a gas vent. Then removing at least a portion of the gas phase fluid with the gas vent. Then compressing the removed portion of gas phase fluid, thereby forming compressed gas stream. And finally accumulating the compressed gas stream in a storage tank downstream of the compressor.
  • FIG. 1 is a schematic representation in accordance with one embodiment of the present invention Description of Preferred Embodiments
  • the gas vent also known as cryovents, keep-full, keep-cold, or vapor vents are well known to one of ordinary skill in the art. These gas vents, are typically designed with a small reservoir that is connected to the fluid handling pipeline. The gas vent may be situated at high points along the pipeline, or anywhere that the skilled artisan would know is an appropriate location. If only liquid is present in the pipeline at that location, the reservoir will thus contain only liquid.
  • the gas vent will typically have a mechanical float that operates a vent valve. As vapor becomes present in the pipeline at this location, if properly designed and installed, this vapor will accumulate in the reservoir. This will cause the mechanical float to move and this will eventually open the vent valve, thereby allowing the vapor to leave the pipeline system.
  • One embodiment of the method of vapor recovery 100 includes providing a combined gas phase and liquid phase fluid 103, by way of a pipe 101 , wherein the pipe 101 comprises a gas vent 102. Then removing at least a portion of the gas phase fluid 104 with the gas vent 102. Then compressing the removed portion of gas phase fluid 104, thereby forming compressed gas stream 106. And finally accumulating the compressed gas stream 106 in a storage tank
  • the combined gas phase and liquid phase fluid 103 may be a cryogenic fluid.
  • the combined gas phase and liquid phase fluid 103 may be selected from the group consisting of nitrogen, argon, oxygen, carbon dioxide, and combinations thereof.
  • the combined gas phase and liquid phase fluid 103 may be at a pressure 5 psig or less.
  • the compressor 105 may be configured to compress the removed portion of the gas phase fluid up to 50 psig.
  • the compressor 105 may be configured to compress the removed portion of the gas phase from between 25 psig and 45 psig.
  • the method of vapor recovery 100 includes providing at least a portion of the compressed gas stream 109 to an on-site user 109 downstream of the compressor 105.
  • the method of vapor recovery 100 includes providing at least a portion of the compressed gas stream 109 to an on-site user

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Emergency Medicine (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

A method of vapor recovery is provided. One embodiment of the method of vapor recovery includes providing a combined gas phase and liquid phase fluid, by way of a pipe, wherein the pipe comprises a gas vent. Then removing at least a portion of the gas phase fluid with the gas vent. Then compressing the removed portion of gas phase fluid, thereby forming compressed gas stream. And finally accumulating the compressed gas stream in a storage tank downstream of the compressor.

Description

A METHOD OF GAS RECOVERY FROM GAS VENTS
Cross Reference to Related Applications
The present application claims the benefit of U.S. Provisional Application
No. 62/232,665 filed September 25, 2015 and U.S. Nonprovisional Application No. 15/170,614 filed June 1 , 2016, herein incorporated by reference in their entirety for all purposes. Background
When a cryogenic liquid flows through pipes in an industrial complex, it is common for some of the liquid to vaporize, causing a, typically undesirable, two- phase flow. This flashing may occur due to heat transfer through the pipe, or simply due to the inevitable pressure drop as the liquid travels through the piping system. It is a common practice for there to be periodic vapor removal devices, referred to as cryovents, keep-full, keep-cold, gas vents, or vapor vents. In this document, these devices will be referred to as vapor vents.
These vapor vents are mechanical venting mechanisms that have a mechanical float that allows gas to exit when the liquid level drops. If these vapor vents are properly located, and properly functioning, they will maintain a liquid fluid flow through the pipeline.
Typically, the vapor that is released from these vapor vents is simply vented to the atmosphere. In some cases, it is desirable to capture and possibly recirculate this vapor. A need exists in the industry for a means of capturing, storing, and possibly reusing the vent vapor from a vapor vent.
Summary
A method of vapor recovery is provided. One embodiment of the method of vapor recovery includes providing a combined gas phase and liquid phase fluid, by way of a pipe, wherein the pipe comprises a gas vent. Then removing at least a portion of the gas phase fluid with the gas vent. Then compressing the removed portion of gas phase fluid, thereby forming compressed gas stream. And finally accumulating the compressed gas stream in a storage tank downstream of the compressor. Brief Description of the Figures
Figure 1 is a schematic representation in accordance with one embodiment of the present invention Description of Preferred Embodiments
Illustrative embodiments of the invention are described below. While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the drawing and are herein described in detail. It should be understood, however, that the description herein of specific embodiments is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure
The gas vent, also known as cryovents, keep-full, keep-cold, or vapor vents are well known to one of ordinary skill in the art. These gas vents, are typically designed with a small reservoir that is connected to the fluid handling pipeline. The gas vent may be situated at high points along the pipeline, or anywhere that the skilled artisan would know is an appropriate location. If only liquid is present in the pipeline at that location, the reservoir will thus contain only liquid. The gas vent will typically have a mechanical float that operates a vent valve. As vapor becomes present in the pipeline at this location, if properly designed and installed, this vapor will accumulate in the reservoir. This will cause the mechanical float to move and this will eventually open the vent valve, thereby allowing the vapor to leave the pipeline system.
Referring to Figure 1 , the sole figure in this application, a method of vapor recovery 100 is described. One embodiment of the method of vapor recovery 100 includes providing a combined gas phase and liquid phase fluid 103, by way of a pipe 101 , wherein the pipe 101 comprises a gas vent 102. Then removing at least a portion of the gas phase fluid 104 with the gas vent 102. Then compressing the removed portion of gas phase fluid 104, thereby forming compressed gas stream 106. And finally accumulating the compressed gas stream 106 in a storage tank
107 downstream of the compressor 105.
The combined gas phase and liquid phase fluid 103 may be a cryogenic fluid. The combined gas phase and liquid phase fluid 103 may be selected from the group consisting of nitrogen, argon, oxygen, carbon dioxide, and combinations thereof. The combined gas phase and liquid phase fluid 103 may be at a pressure 5 psig or less. The compressor 105 may be configured to compress the removed portion of the gas phase fluid up to 50 psig. The compressor 105 may be configured to compress the removed portion of the gas phase from between 25 psig and 45 psig.
In another embodiment, the method of vapor recovery 100 includes providing at least a portion of the compressed gas stream 109 to an on-site user 109 downstream of the compressor 105.
In another embodiment, the method of vapor recovery 100 includes providing at least a portion of the compressed gas stream 109 to an on-site user
108 downstream of the storage tank 107.

Claims

Claims:
1 . A method of vapor recovery, comprising;
• providing a combined gas phase and liquid phase fluid (103), by way of a pipe (101 ), wherein the pipe (101 )( comprises a gas vent (102),
• removing at least a portion of the gas phase fluid (104) with the gas vent (102),
• compressing the removed portion of gas phase fluid (104), thereby forming compressed gas stream (106);
• accumulating the compressed gas stream (106) in a storage tank (107) downstream of the compressor (105).
2. The method of vapor recovery of claim 1 , wherein the combined gas phase and liquid phase fluid (103) is a cryogenic fluid.
3. The method of vapor recovery of claim 1 , wherein the combined gas phase and liquid phase fluid (103) is selected from the group consisting of nitrogen, argon, oxygen, carbon dioxide, and combinations thereof.
4. The method of vapor recovery of any of the above claims, further comprising:
• vaporizing any liquid phase fluid that is entrained in compressed gas stream (106) in a vaporizer (108) downstream of the gas vent (102) and upstream of the compressor (105).
5. The method of vapor recovery of claim 4, wherein the vaporizer (108) heats the compressed gas stream (106) to ambient temperature.
6. The method of vapor recovery of any of the above claims, wherein the combined gas phase and liquid phase fluid (103) is at a pressure 5 psig or less.
7. The method of vapor recovery of any of the above claims, wherein compressed gas stream (106), is compressed to a pressure to a maximum pressure of 50 psig.
8. The method of vapor recovery of any of the above claims, wherein compressed gas stream (106), is compressed to a pressure of between 25 psig and 45 psig.
9. The method of vapor recovery of any of the above claims, further comprising:
• providing at least a portion of the compressed gas stream (109) to an on-site user (109) downstream of the compressor (105).
10. The method of vapor recovery of any of the above claims, further comprising:
• providing at least a portion of the compressed gas stream (109) to an on-site user (108) downstream of the storage tank (107).
PCT/US2016/052818 2015-09-25 2016-09-21 A method of gas recovery from gas vents Ceased WO2017053385A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2018513632A JP2018532959A (en) 2015-09-25 2016-09-21 Gas recovery method from gas vent

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201562232665P 2015-09-25 2015-09-25
US62/232,665 2015-09-25
US15/170,614 US20170089636A1 (en) 2015-09-25 2016-06-01 Method of nitrogen gas recovery from gas vents
US15/170,614 2016-06-01

Publications (1)

Publication Number Publication Date
WO2017053385A1 true WO2017053385A1 (en) 2017-03-30

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PCT/US2016/052818 Ceased WO2017053385A1 (en) 2015-09-25 2016-09-21 A method of gas recovery from gas vents

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US (1) US20170089636A1 (en)
JP (1) JP2018532959A (en)
WO (1) WO2017053385A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1409013A (en) * 1963-12-26 1965-08-20 Method and installation for transporting gases such as natural gas over long distances
DE4337900A1 (en) * 1993-11-08 1995-05-11 Oberzom Anstalt Process and apparatus for delivering gas-charged liquid media in pipelines
US20020043289A1 (en) * 2000-04-18 2002-04-18 Goodyear Mark A. Eductor system and method for vapor recovery

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1472533A (en) * 1973-06-27 1977-05-04 Petrocarbon Dev Ltd Reliquefaction of boil-off gas from a ships cargo of liquefied natural gas
CA2653643C (en) * 2009-02-26 2010-08-31 Westport Power Inc. Pressure control system and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1409013A (en) * 1963-12-26 1965-08-20 Method and installation for transporting gases such as natural gas over long distances
DE4337900A1 (en) * 1993-11-08 1995-05-11 Oberzom Anstalt Process and apparatus for delivering gas-charged liquid media in pipelines
US20020043289A1 (en) * 2000-04-18 2002-04-18 Goodyear Mark A. Eductor system and method for vapor recovery

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US20170089636A1 (en) 2017-03-30
JP2018532959A (en) 2018-11-08

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