US20110315687A1 - Method and system for reducing and preventing emissions from liquid storage tanks - Google Patents

Method and system for reducing and preventing emissions from liquid storage tanks Download PDF

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Publication number
US20110315687A1
US20110315687A1 US13/060,846 US200913060846A US2011315687A1 US 20110315687 A1 US20110315687 A1 US 20110315687A1 US 200913060846 A US200913060846 A US 200913060846A US 2011315687 A1 US2011315687 A1 US 2011315687A1
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US
United States
Prior art keywords
liquid
storage tank
inflatable element
liquid holder
holder
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.)
Abandoned
Application number
US13/060,846
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English (en)
Inventor
Erik Jeroen Eenkhoorn
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.)
Accede BV
Original Assignee
Accede BV
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 Accede BV filed Critical Accede BV
Assigned to ACCEDE B.V. reassignment ACCEDE B.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EENKHOORN, ERIK JEROEN
Publication of US20110315687A1 publication Critical patent/US20110315687A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets
    • B65D88/40—Large containers having floating covers, e.g. floating roofs or blankets with support for aground cover
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/02—Wall construction
    • B65D90/04—Linings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/02—Wall construction
    • B65D90/04—Linings
    • B65D90/046—Flexible liners, e.g. loosely positioned in the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/22—Safety features
    • B65D90/38—Means for reducing the vapour space or for reducing the formation of vapour within containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2590/00—Component parts, details or accessories for large containers
    • B65D2590/02—Wall construction
    • B65D2590/04—Linings
    • B65D2590/043—Flexible liners
    • B65D2590/046—Bladders

Definitions

  • the invention relates to a system for use interiorly in a storage tank, said storage tank being suitable for storing a liquid load, the system comprising: at least one flexible liquid holder for containing the liquid load.
  • the “fixed roof” storage tanks have a fixed interior volume.
  • Said storage tanks may be located upon solid base ground like in a storage yard or may be located upon a floating device like a ship, which is arranged for transportation of liquids; or like a tanker; or like a so-called FPSO (Floating Production, Storage and Offloading) provided with storage compartments.
  • the tank volume is partially filled with a liquid product, the remaining part of the volume being filled with ambient air. This ambient air will saturate with vapour resulting from the liquid, until the vapour pressure, corresponding to the temperature in the tank, is reached.
  • evaporation is determined by the so-called breathing of the tank, whereby saturated vapour is discharged out of the tank and clean air from outside is drawn in into the tank. While filling this type of storage tanks containing liquid products, the air present in the tank, comprising vapour from the liquid, will be vented from the tank and emitted to the ambient air, unless suctioned in and recycled.
  • the “floating roof” storage tanks have a variable volume.
  • the roof of the tank floats upon the liquid contained in the tank, so that usually, as a result, no free space is present within this type of tank.
  • the roof will move down until it reaches a mechanically determined minimum height; usually about 1,5 meter above the base floor of the tank, whereby the roof is supported upon legs mounted onto the underside the roof.
  • the free space between the roof, supported on its legs, and the liquid is filled with ambient air. This air will also get saturated with vapour resulting from the liquid until the vapour pressure, corresponding to the temperature in the tank, is reached.
  • vapour-air mixture generally has a higher specific weight than ambient air and remains therefore usually within the cylindrically shaped upright wall, which e.g. may lead to so-called “rim fires”: fires originating from lightning strokes on the tank, thereby causing ignition of said vapour-air mixture.
  • vapour-phase emissions also emissions of the liquid products from both type of tanks may occur.
  • these emissions are caused by small scale leakages like e.g. not thoroughly closed flanged connections or leaking valves.
  • the liquid losses caused by small leakages generally disappear into the base ground nearby the tank. Large losses will occur as a result of the failure of the wall of the tank.
  • Each tank is therefore surrounded by a so-called “bundwall”. This is a dike around the tank, whereby the height of the dike and the interior surface are such dimensioned in that the holding capacity for the amount of liquid corresponds to the maximum tank volume.
  • the remaining liquids are lost during cleaning of the tank.
  • the flexible liquid holder is further inflated by the gas or the vapour phase, so that after draining the liquid holder by removal of the liquid phase, a substantial amount of gas or vapour is retained within the flexible holder which may contaminate the next liquid charge or may lead to undesired emissions and/or loss of product or to costs for cleaning.
  • an inflatable element for use interiorly in a holder, the holder being suitable for storing and/or transporting of a liquid load, in particular for a holder of a transport or storage device like a tank lorry, a tank container or a storage tank.
  • the inflatable element may be adjusted to the free space above the liquid in the holder, so that both an anti-slosh device and a reduction of the vapour space is realized.
  • the storage tank may be operated in such a way that vapour or gas formation in the liquid holders, located inside the storage tank, is avoided.
  • the object of the invention is therefore to provide a system whereby vapour and gas formation by liquids present in the tank, vapour and gas emissions to the environment and also uncontrollably and undesirably expelling of liquids from the tank during filling and emptying is prevented, and whereby the risk of fire and/or an explosion is reduced and a dike or ‘bundwall’ is superfluous for retaining the liquid product or liquid load in case of failure of the storage tank wall or of failure of the holder of the liquid products.
  • a system according to the preamble further comprises: at least one inflatable element, suitable for containing an inflating gas.
  • the gas and vapour formation is reduced, formation of a gas or vapour phase in the liquid holder is prevented as a result of inflating the inflatable element by means of the inflating gas.
  • the inflatable element is provided with an accordion wall or otherwise extendable or unfoldable wall or walls, which unfold or fold up respectively by supplying or discharging inflating gas.
  • the flexible liquid holder comprises flexible walls and/or is provided with an accordion wall or otherwise extendable or unfoldable wall or walls, which unfold or fold up respectively by supplying or discharging the liquid load.
  • the inflatable element and/or the liquid holder are configured out of two or more elements or are provided with two or more compartments. As a result thereof large elements or holders for large storage tanks may be manufactured easily and at low costs.
  • the invention also provides for an inflatable support element provided interiorly within the liquid holder, which support element, in its inflated use position, being suitable as support for the roof of the storage tank or as support for the inflatable element.
  • These inflatable support elements provided inside the liquid holder, occupy a portion of the liquid holder so that the roof or an inflatable element located upon the liquid holder, may be supported and inflow of ambient air is prevented or strongly reduced.
  • liquid holder positioned within the storage tank, on its upper side is not provided with a wall, so that as a result the inflatable element rests upon the liquid surface of the liquid load.
  • the liquid holder being open at the upper side and whereby the upper side is covered by the inflatable element, the free space above the liquid—and therewith the formation of vapour and gas—is reduced by the inflatable element.
  • the means are selected from: vacuum en overpressure means; a pressure or level controlled air system with air pump or compressor or other overpressure air system; safety, warning or registration system for liquid present between the flexible liquid holder and the wall of the storage tank.
  • vapour and gas in the liquid holder is decreased and vapour emissions and uncontrollable and undesirable expelling of liquids from the storage tank, during filling and draining, is prevented.
  • the roof of the storage tank is a floating roof, and that the inflatable element, at its roof side, is provided with a shape corresponding to the interior shape of the roof.
  • the inflatable element with the therein contained inflating gas, is mounted upon the upper side of the flexible liquid holder such that in the use position within the storage tank essentially the inflatable element abuts against het roof of the holder and the flexible liquid holder essentially abuts against the base of the storage tank.
  • the inflatable elements closely adjacently link up against the roof in order to prevent vapour and gas formation, while the liquid holder closely abuts against the base preventing emission and leakage of liquid.
  • connection means such as inflow en outflow means, with which inflating gas and liquid load respectively, without contacting the storage tank or the tank wall, are supplied in or out of the storage tank.
  • the inflatable element only occupies a portion of the volume difference between the volume of the storage tank and the volume of the liquid holder.
  • connection means By means of the connection means the liquid holder and the inflatable element may be filled and drained independently with respect to each other.
  • the system may be operated in such a way, that the liquid holder and the inflatable element together will not completely fill up the entire volume of the storage tank.
  • the invention also relates to a method for supplying and discharging of liquid load to a storage tank which is provided with a system according to the invention comprising the following steps:
  • the invention also provides for an optional addition, which measures, registers or reports the possible presence of liquid between the flexible liquid holder and the tank wall.
  • This addition may optionally be connected to a safety or warning system of the tank terminal, where the storage tank is a part of.
  • the invention also provides for the possibility to let the upper side of the inflatable element function as the roof of the tank, such that this upper side of the inflatable element is always retained at the same position, identical to the roof of a “fixed roof” tank and in which the remaining part of the inflatable element is adaptable to a variety of shapes so that free air is not available in the tank, or in other words, the entire volume of the tank is filled by the liquid and the inflatable element.
  • the invention takes care for both considerably decreasing the possibility of the creation and the consequences of a fire or an explosion and for an alternative configuration during a catastrophe with two independently functioning flexible holders within the storage tank: an inflatable element and a liquid holder, whereby the current storage tank outside wall constitutes the outer boundary.
  • FIG. 1 shows a perspective view of a storage tank having a “floating roof”, provided with a system according to the invention
  • FIG. 2 shows a perspective view of a storage tank with a “fixed roof” provided with the system according to the invention
  • FIG. 3 shows a perspective view of an “open” storage tank provided with the system according to the invention.
  • FIG. 1 shows a storage tank 2 with a roof 6 , which may vertically displace within the storage tank (floating roof), provided with inflatable support elements 10 within the liquid holder 1 .
  • a roof 6 On the right side of the storage tank 2 is shown liquid holder 1 wherein liquid load 3 is contained.
  • the liquid holder 1 may be provided with a flexible wall 8 and/of an accordion wall 7 or otherwise extendable or unfoldable wall so that the volume of the liquid holder may be easily, without the need of applying a high internal pressure, be enlarged or made smaller when the liquid load 3 is introduced into or out of the liquid holder, respectively.
  • the roof 6 will move downwards.
  • inflatable support elements 10 are provided within the liquid holder 1 .
  • the liquid holder 1 is omitted so that the inflatable support elements 10 are visible as support of the roof 6 .
  • the inflatable support elements 10 may also be used as support for an inflatable element 11 (see FIG. 2 ) which is mounted on top of the liquid holder 1 .
  • FIG. 2 shows a storage tank 2 , having a roof 6 ′ which cannot be vertically displaced within the storage tank (fixed roof), provided with an inflatable element 11 and a liquid holder 1 according to the invention.
  • the liquid holder 1 may be open on its upper side or constitute a completely enclosed space.
  • Both the liquid holder 1 and the inflatable element 11 may be provided with an accordion wall 7 respectively 12 .
  • the inflatable element 11 and/or the liquid holder 1 may each comprise one space, but may also be formed from two or more elements and/or be provided with two or more compartments. In order to prevent formation of vapour or gas within the storage tank 2 and/or within the liquid holder 1 , the inflatable element 11 and the liquid holder 1 together are exactly filling up the internal volume of the storage tank 2 .
  • the system according to the invention provides for means by which the volume of the inflatable element 11 may be changed oppositely, when the volume of the flexible liquid holder 1 changes. These means may be a warning or registration system, whereby for example the pressure in the liquid holder 1 and/or the inflating element 11 is measured.
  • Suitable measurement methods are: a level measurement or a weight measurement of the liquid load or a pressure measurement of the walls with a resistance strain gauge or similar. Furthermore a flow-measurement may be provided at the connection means 9 , 17 .
  • the control part of the system will charge or discharge inflating gas 13 to or from the inflatable element 11 , such that the volume change within the liquid holder will be compensated.
  • the charging or discharging may be executed by means of a feedback loop, but may also be executed by means of a calculation of a certain amount of required volume.
  • control part of the system may be set up in such a way, that the volume of the storage tank 2 is continuously completely filled up, but if required may also be set up, such that the liquid holder 1 and the inflatable element 11 only occupy a portion of the volume of the storage tank 2 .
  • the system may comprise vacuum or overpressure facilities and an air system comprising an air pump or compressor 15 .
  • the inflatable element 11 on its upper or roof side is provided with a shape corresponding to the interior shape of the roof.
  • both the roof 6 ′ and the inflatable element 11 are provided with a conical shape.
  • the inflatable element 11 closely links up with the roof 6 ′ so that deformation of the inflatable element 11 or creation of free spaces between the inflatable element 11 and the roof 6 ′ is prevented.
  • the corresponding shape of a roof 6 (like in FIG. 1 ) has the advantageous effect of a uniform distribution of the forces acting upon the roof, so that the inflatable element 11 has a small chance on deformation and/or leakage and moreover the roof will be uniformly supported over its entire surface and can be moved vertically.
  • the liquid holder 1 in FIG. 2 may be open at its upper side, so that the inflatable element 11 rests upon or is supported by the liquid surface of the liquid load 3 .
  • the liquid holder rests upon or is supported by the base ground 16 of the holder 2 . Because the inflatable element 11 is in contact with the liquid load 3 the vapour and gas formation above the liquid is prevented.
  • the liquid holder 1 is a completely enclosed space so that as a result the liquid load 3 does not come in contact with the walls of the storage tank 2 and the walls of the inflatable element 11 so that contamination of the inflatable element 11 and/or the walls may not occur.
  • the system is provided with a supply system 15 , 17 for a gaseous product (also inflating gas 13 ), usually ambient air, which is available at the storage tank 2 location by means of an air or gaseous supply system, or otherwise by means of a facility directly coupled with inflating element 11 like an air or gas compressor or pump 15 or a high pressure storage vessel.
  • the supply system consists of a discharge system for the gaseous product comprising a direct exhaust facility when applying ambient air or comprising a system wherein cleaning facilities or other possibilities are provided for reuse or another responsible method for removal of the gaseous product. In its basic configuration the system is pressure controlled.
  • the pressure within the inflatable element 11 When filling the storage tank 2 or the holder with the liquid load 3 by means of connection 9 the pressure within the inflatable element 11 will rise so that the pressure controlled system, comprising the inflatable element 11 , will discharge gaseous filling out of the inflatable element 11 by means of connection 17 in such a way that the otherwise resulting pressure increase is neutralised.
  • the pressure within the inflatable element 11 will decrease so that the pressure controlled system, comprising the inflatable system 11 , will supply gaseous product into the inflatable element 11 in such a way that the otherwise resulting pressure drop is counter acted and neutralized.
  • the pressure within the inflatable element—for the reduction of the formation of this vapour or gas formation— is set up at a small overpressure, for example between 0-1 bar overpressure and preferably the pressure is selected from the range 0-0.2 bar overpressure.
  • FIG. 3 shows a storage tank 2 without roof having an inflatable element 11 .
  • the inflatable element 11 functions as the roof of the ‘open’ storage tank 2 .
  • an “open” liquid holder 1 the bottom side 18 of the inflatable element rests upon the liquid surface of the liquid load 3 .
  • a closed liquid holder 1 is provided whereby the bottom side of the inflatable element also rests upon the upper side of the liquid holder 1 .
  • the inflatable element of the liquid holder may be manufactured from (a combination of) a suitable material like a plastic or metal.
  • the storage tank may be positioned upon a solid base ground, but may also be part of a floating object like a tanker of a floating storage tank.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
US13/060,846 2008-08-26 2009-08-26 Method and system for reducing and preventing emissions from liquid storage tanks Abandoned US20110315687A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL1035869A NL1035869C (nl) 2008-08-26 2008-08-26 Werkwijze en systeem voor het beperken en voorkomen van emissies van opslagtanks voor vloeibare producten.
NL1035869 2008-08-26
PCT/NL2009/000163 WO2010024662A1 (en) 2008-08-26 2009-08-26 Method and system for reducing and preventing emissions from liquid storage tanks

Publications (1)

Publication Number Publication Date
US20110315687A1 true US20110315687A1 (en) 2011-12-29

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ID=40487446

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Application Number Title Priority Date Filing Date
US13/060,846 Abandoned US20110315687A1 (en) 2008-08-26 2009-08-26 Method and system for reducing and preventing emissions from liquid storage tanks

Country Status (12)

Country Link
US (1) US20110315687A1 (de)
EP (1) EP2318289B1 (de)
JP (1) JP2012501415A (de)
KR (1) KR20110056390A (de)
CN (1) CN102186750B (de)
AU (1) AU2009286233B2 (de)
BR (1) BRPI0913139A2 (de)
CA (1) CA2734719A1 (de)
EA (1) EA201100237A1 (de)
MY (1) MY153991A (de)
NL (1) NL1035869C (de)
WO (1) WO2010024662A1 (de)

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CN108316731A (zh) * 2018-04-16 2018-07-24 长春市中源泵业有限公司 一种用于油田的超大型组装式蓄液池

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NL2008902C2 (nl) * 2012-05-30 2013-12-04 Wiefferink B V Container voor het bevatten van een gas bevattende en/of gas producerende substantie, afdekfolie voor het afdekken van een substantie in een dergelijke container, en werkwijze voor het aanbrengen van een dergelijke afdekfolie in een container.
NL1040611C2 (nl) * 2014-01-17 2015-07-20 Accede B V Inwendige vloeistofhouders welke langdurig toegepast kunnen worden in vormvaste opslagtanks voor het, zonder beperkingen voor de operationele en veiligheidseisen, verbeteren van de kwaliteit van het opslaan van vloeistoffen in tanks.
CN104139931B (zh) * 2014-08-09 2016-08-17 威特龙消防安全集团股份公司 一种外浮顶石油储罐一、二次密封空间防燃爆安全装置
CN104787505B (zh) * 2015-04-20 2017-06-30 中国石油化工股份有限公司青岛安全工程研究院 用于浮顶储罐的安全防护方法
NL1041307B1 (en) * 2015-05-13 2017-01-19 Accede B V A large rigid liquid containment system with internal non-rigid flexible multiple liquid holders, in order to store, possibly different, liquids separately and simultaneously, and allow for volume mutations independently of each stored liquid without operational and safety restrictions.
CN116658795B (zh) * 2023-07-24 2023-11-14 中国电建集团华东勘测设计研究院有限公司 一种压缩二氧化碳储能系统大容积承压储气装置

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Also Published As

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NL1035869C (nl) 2010-03-11
MY153991A (en) 2015-04-30
CA2734719A1 (en) 2010-03-04
JP2012501415A (ja) 2012-01-19
EP2318289A1 (de) 2011-05-11
AU2009286233A1 (en) 2010-03-04
KR20110056390A (ko) 2011-05-27
WO2010024662A1 (en) 2010-03-04
BRPI0913139A2 (pt) 2016-07-26
CN102186750A (zh) 2011-09-14
EP2318289B1 (de) 2016-07-13
AU2009286233B2 (en) 2014-06-12
CN102186750B (zh) 2014-04-09
EA201100237A1 (ru) 2011-10-31

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