EP1091812B1 - Verfahren zum reinigen eines ölspeichertanks und gerät zur verwirklichung des verfahrens - Google Patents

Verfahren zum reinigen eines ölspeichertanks und gerät zur verwirklichung des verfahrens Download PDF

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Publication number
EP1091812B1
EP1091812B1 EP97952101A EP97952101A EP1091812B1 EP 1091812 B1 EP1091812 B1 EP 1091812B1 EP 97952101 A EP97952101 A EP 97952101A EP 97952101 A EP97952101 A EP 97952101A EP 1091812 B1 EP1091812 B1 EP 1091812B1
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EP
European Patent Office
Prior art keywords
tank
crude
sediment
nozzles
floating roof
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.)
Expired - Lifetime
Application number
EP97952101A
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English (en)
French (fr)
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EP1091812A1 (de
Inventor
Mike Wartel
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.)
Petrojet International SA
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Petrojet International SA
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Publication date
Application filed by Petrojet International SA filed Critical Petrojet International SA
Publication of EP1091812A1 publication Critical patent/EP1091812A1/de
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Publication of EP1091812B1 publication Critical patent/EP1091812B1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
    • B08B9/0933—Removing sludge or the like from tank bottoms

Definitions

  • the present invention relates to a process for resuspending a sediment which has, by deposition, formed a layer on the bottom of a floating roof tank containing crude oil and has a device for carrying out said process. .
  • the crude oil storage tanks are very generally cylindrical tanks with floating roof.
  • the roof structure is therefore at a higher or lower level relative to the ground depending on the amount of crude oil in the tank.
  • the periphery of the floating roof comprises sealing members to prevent oil from passing to the periphery of the roof. It has been found that in these storage tanks, a sediment consisting for the most part of the heaviest fractions of the stored crude oil, in particular of paraffinic compounds, and of inorganic elements such as water, is gradually deposited on the bottom of the tank. water, sand, rust particles or the like.
  • This sediment is likely to form on the bottom of the tank very thick layers of 1 or 2 meters or more and it is necessary to clean the tanks by removing this sediment. Indeed, if the sediment accumulates on the bottom of the tank and the floating roof descends to the bottom as the emptying of the tank, the risk is to have a contact between the floating roof and a point of the tank. deposition of the sediment, which unbalances the roof and blocks it in an oblique position in the side wall of the tank; However, the weight of a floating roof is several hundred tons, it is conceivable that the repair of such an incident entails considerable costs.
  • the invention is based on the fact that the sediment can be resuspended in the crude oil which overcomes it, provided that turbulence and / or vortices are generated throughout the volume of liquid oil that overcomes the sediment. and to send sufficiently powerful oil jets on the sediment so that it is gradually resuspended and maintained in this state by the turbulence imposed in the liquid crude oil.
  • the layer of sediment disappears little by little and is found inside the liquid crude oil, which enhances the sediment since there is no longer any sedimentary material to evacuate out of the tank to be destroyed.
  • the reinjection into the tank is carried out by rotary lances arranged vertically under the floating roof, these lances being equipped with nozzles which send oil jets in the direction of the sediment layer; the rotation of the lances generates vortices having as axis the axis of the lances and one makes so that these vortices concern the totality of the tank.
  • the crutches of the floating roof are replaced by the lances that reinject the crude oil, the bottom of the lances arriving near the middle plane of the upper face of the sediment layer.
  • the subject of the present invention is therefore a process for resuspending a sediment which has deposited, by deposition, a layer on the bottom of a floating roof tank containing crude oil, according to claim 1.
  • n The choice of the number n that defines the global hourly flow rate sucked back into the tank is a function of the characteristics of the tank to be cleaned by resuspension of the sediment, the physicochemical characteristics of the sediment itself and the immobilization time that we accept to clean the tank.
  • the present invention also relates to a device for implementing the method as defined above according to claim 4.
  • each lance has three nozzle levels, a nozzle of the median level generating a substantially horizontal jet whereas the nozzles of the other two levels generate jets whose axis is inclined by 50 to 70 ° with respect to the axis of the nozzle.
  • lance that carries the nozzle It can be provided that each nozzle level has two diametrically opposed nozzles.
  • the lower level nozzle (s) is (are) disposed at a level between 20 and 50 cm above the average level of the sediment layer.
  • the (or) pump (s), which sucks (s) the crude into the tank is (are) volumetric (s); it may be, for example, screw pumps.
  • This type of pump provides a given flow rate and the pressure that is obtained at the outlet of the nozzles is, accordingly, a function of the outlet section of all the nozzles fed by the pump.
  • the volume involved in the turbulence around a lance is obviously all the more important as the ejection pressure of the jet is higher. It is ensured that these volumes, which are substantially cylinders having as their axis the axis of the lances, overlap with the volumes relating to the adjacent lances so that no part of the liquid oil contained in the tank remains outside the turbulence. set created according to the invention.
  • the stirring of the sediment also causes the resuspension of the inorganic elements contained in the sediment.
  • a suction filter pumps to remove these inorganic elements, the parts that pass through the filter is, in any case, ground by the pump screws.
  • the device according to the invention comprises at least two pumps each preceded by at least one filter and each followed by a distributor, each output channel of which delivers on an enclosure which supplies p lances, p being the same. integer for all speakers in the device.
  • the tank 1 has been designated as a whole a crude oil storage tank; the tank 1 consists of a cylindrical side wall 1a, the base 1 b is the bottom of the tank.
  • the tank is equipped with a floating roof 2 whose periphery comprises unrepresented sealing members.
  • the tank 1 is intended for the storage of crude oil, the roof 2 floating on the crude.
  • a tank may have a diameter of about 50 m and a height of 15 m.
  • the crude gradually settles and gives rise to a sediment 3 which constitutes a layer on the bottom of tank 1b , layer that can reach several meters thick; the surface of the layer is relatively irregular.
  • the sediment is usually of a thyxotropic nature.
  • the vessel is partially emptied; if a layer of sediment with an average thickness of 1 m is assumed, about 3 m of crude oil is left in the tank above the sediment, that is, the roof 2 is about 4 m above the bottom of the tank.
  • the floating roof 2 is equipped with 72 crutches which cross the roof by crutch sleeves designated by 4 in Figure 3. These crutches have a length of between 1.8 and 2.2 m and come into support on the tank bottom when the floating roof drops sufficiently low.
  • each lance 5 is a tube that is pivotally placed in a crutch sleeve.
  • the lance 5 is rotated about its axis by an explosion-proof electric motor 6 located at the top of the lance, above the floating roof 2.
  • the crude oil supply of the lance 5 is carried out by a pipe 7.
  • the lance 5 comprises three levels of nozzles for discharging the crude oil brought into the tube which constitutes the lance through the pipe 7. These nozzles direct the exit jets. Each level has two diametrically opposed nozzles on the lance.
  • the two nozzles of the lower level provide jets 8a whose axes are 60 ° with the axis of the lance 5, said jets being oriented towards the tank bottom; the two nozzles of the upper level provide jets 8c whose axes make with the axis of the lance 5 an angle of 60 °, these jets being directed towards the floating roof 2; the two nozzles of the median level form jets 8b whose axes are substantially horizontal.
  • the lower level nozzles are approximately 30 cm above the mean plane of the sediment layer 3; the mid-level nozzles are approximately 60 cm above the lower level and the upper level nozzles are also about 60 cm above the mid-level nozzles.
  • the base of the lances 5 is closed.
  • the motors 6 drive the lances 5 at two revolutions / minute.
  • the pumping in the tank 1 is carried out by means of two pumps 8; the pumps 8 are volumetric screw pumps which each discharge 400 m 3 / h.
  • the pumps 8 are arranged in parallel and, upstream of each pump, a filter 9 has been arranged.
  • the two filters 9 are connected to the outlet of a tank of 2000 liters whose inlet is connected by a pipe 11 to the lower part of the side wall 1a of the vessel 1. the filters 9 are intended to remove inorganic elements found in the pumped oil.
  • Each of the two pumps 8 delivers on a distributor 12.
  • Each distributor 12 has three outputs each of which delivers on a chamber 13 of 200 liters; each enclosure 13 has six outputs equipped with a valve 14 and each connected to a pipe 7 for feeding two lances 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Laser Beam Processing (AREA)
  • General Factory Administration (AREA)

Claims (8)

  1. Verfahren zur Wiedersuspendierung eines Sediments (3), das durch Ablagerung eine Schicht auf dem Grund eines Rohöltanks (1) mit Schwimmdach (2) gebildet hat, wobei besagtes Schwimmdach (2) viele, gleichmäßig auf der Oberfläche verteilte Stützenlöcher (4) aufweist, wobei besagte Löcher (4) die Befestigung der Stützen, die das Dach (2) durch Auflage auf dem Tankboden (1b) tragen sollen, mit dem Dach (2) ermöglichen, wenn die Füllhöhe des Rohöls im Tank (1) niedriger ist, als die Länge der Stützen, bei dem:
    - man den Tank (1) bis zu einer bestimmten Höhe, in einer bestimmten Entfernung von der maximalen Höhe des Sediments (3) auf dem Tankboden (1b) entfernt mit Rohöl füllt,
    - man das Rohöl durch mindestens eine Pumpe (8) mit einer Gesamtstundenleistung von V/n in den Tank (1) saugt, wobei V das im Tank (1) verbleibende Volumen unter dem Schwimmdach (2) ist,
    - man das gepumpte Rohöl durch Einspritzen mittels Strahlrohren (5), die durch die Schwimmdächer (2) getragen und im Tank (1) senkrecht über dem Sediment (3) eingesetzt werden, in den Tank (1) leitet, wobei jedes der Strahlrohre (5) unter dem Schwimmdach (2) eine Länge aufweist, die kleiner ist als die festgelegte Entfernung, und um seine Achse in einer Drehbewegung angetrieben wird, an seinem unteren Ende verschlossen ist und eine Vielzahl an Düsen aufweist, die sich in Bezug auf den Tankboden (1b) in unterschiedlicher Höhe befinden, wobei der Strahl (8a) der unteren Düsen auf den Tankboden (1b) gerichtet wird und der Austrittsquerschnitt eines Strahlrohrs (5) so klein ist, dass der durch die Leistung der Pumpe(n) (8) entstehende Austrittsdruck des Rohölstrahls so stark ist, dass sich das durch ein Strahlrohr (5) entstehende Wirbelvolumen mit den Wirbelvolumen der danebenliegenden Strahlrohre (5) überschneidet.
    - man das Verfahren so lange fortsetzt, bis die Dichte des gepumpten Rohöls einen Wert erreicht hat, bei dem das Sediment (3) fast vollständig wiedersuspendiert wird, dadurch gekennzeichnet, dass besagte festgelegte Entfernung ungefähr 2 bis 5 Meter beträgt, wobei die Anzahl n ungefähr zwischen 8 und 15 liegt, und dadurch, dass die Strahlrohre (5) bei einer Geschwindigkeit zwischen 0,25 und 4 Umdrehungen/Minute in einer Drehbewegung angetrieben werden.
  2. Verfahren gemäß Patentanspruch 1, dadurch gekennzeichnet, dass das (oder die) unteren Düsen jedes Strahlrohrs in Höhe 20 bis 50 cm Höhe über der durchschnittlichen Höhe der Sedimentschicht (3) angeordnet sind.
  3. Verfahren nach Patentanspruch 1 oder 2, dadurch gekennzeichnet, dass man auf jedem Strahlrohr (5) auf der gesamten Länge verteilt mehrere Düsen anordnet, damit die gesamte Höhe der flüssigen Rohölschicht im Tank (1) durch das von einem Strahlrohr (5) erzeugte Wirbelvolumen erreicht wird.
  4. Vorrichtung mit Tank (1) mit Schwimmdach (2) zur Wiedersuspendierung eines Sediments für den Einsatz eines Verfahrens nach Patentanspruch 1 bis 3, wobei das Sediment (3) durch Ablagerung auf dem Boden des Tanks (1) eine Rohöl enthaltende Schicht gebildet hat, wobei besagtes Schwimmdach (2) viele, gleichmäßig auf ihrer Fläche verteilte Stützenlöcher (4) aufweist, wobei besagte Löcher (4) die Befestigung der Stützen, die das Dach (2) tragen sollen, am Dach (2) durch Auflage auf dem Tankboden (1b) ermöglicht, wenn die Füllhöhe des Rohöls im Tank (1) niedriger ist, als die Länge der Stützen, wobei die Vorrichtung ferner mindestens eine Pumpe (8) zum Ansaugen des Rohöls in den Tank umfasst, Strahlrohre (5), die vom Schwimmdach (2) getragen und senkrecht in den Tank (1) eingesetzt werden, um das gepumpte Rohöl wieder in den Tank zu füllen, wobei jedes Strahlrohr (5) in einer Drehbewegung um seine Achse mit einer Geschwindigkeit zwischen 0,25 und 4 Umdrehungen/Minute angetrieben wird, an seinem unteren Ende verschlossen ist und mehrere Düsen aufweist, die sich in Bezug auf den Tankboden (1b) in unterschiedlicher Höhe befinden, wobei der Strahl (8a) der oberen Düsen zum Schwimmdach (2) gerichtet wird und die Strahlrohre (5) an Stelle der Stützen in den Muffen der Stützenlöcher (4) des Schwimmdachs (2) des Behälters (1) angeordnet sind.
  5. Vorrichtung nach Patentanspruch 4, dadurch gekennzeichnet, dass jedes Strahlrohr (5) drei Düsenhöhen aufweisen, wobei eine Düse in mittlerer Höhe einen deutlich waagrechten Strahl (8b) erzeugt, wohingegen die oberen und unteren Düsen in Bezug auf die Achse des die Düse tragenden Strahlrohrs (5) einen 50° bis 70° geneigten Strahl (8a, 8c) erzeugen.
  6. Vorrichtung nach Patentanspruch 5, dadurch gekennzeichnet, dass in jeder Düsenhöhe zwei Düsen diametral einander gegenüberliegen.
  7. Vorrichtung nach Patentanspruch 4 bis 6, dadurch gekennzeichnet, dass die Pumpe(n), die das Rohöl in den Tank (1) saugt (saugen) (nt), volumetrisch ist (sind).
  8. Vorrichtung nach Patentanspruch 7, dadurch gekennzeichnet, dass sie mindestens zwei Pumpen (8) umfasst, vor denen sich mindestens ein Filter (9) und hinter denen sich jeweils ein Verteiler (12) befindet, die die Flüssigkeit über ihre Austrittskanäle zu einem Behälter (13) pumpen, der p Strahlrohre (5) versorgt, wobei p für alle Behälter (13) der Vorrichtung die gleiche ganze Zahl ist.
EP97952101A 1997-12-15 1997-12-18 Verfahren zum reinigen eines ölspeichertanks und gerät zur verwirklichung des verfahrens Expired - Lifetime EP1091812B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU90183A LU90183B1 (fr) 1997-12-15 1997-12-15 Procédé de nettoyage d'une cuve de pétrole et dispositif pour la mise en oeuvre dudit procédé
PCT/FR1997/002347 WO1999032238A1 (fr) 1997-12-15 1997-12-18 Procede de nettoyage d'une cuve de petrole et dispositif pour la mise en oeuvre dudit procede

Publications (2)

Publication Number Publication Date
EP1091812A1 EP1091812A1 (de) 2001-04-18
EP1091812B1 true EP1091812B1 (de) 2007-08-22

Family

ID=26233352

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97952101A Expired - Lifetime EP1091812B1 (de) 1997-12-15 1997-12-18 Verfahren zum reinigen eines ölspeichertanks und gerät zur verwirklichung des verfahrens

Country Status (14)

Country Link
EP (1) EP1091812B1 (de)
AT (1) ATE370801T1 (de)
AU (1) AU5564598A (de)
BR (1) BR9714913A (de)
DE (1) DE69738052T2 (de)
DK (1) DK1091812T3 (de)
EA (1) EA003659B1 (de)
ES (1) ES2293666T3 (de)
HK (1) HK1035509A1 (de)
LU (1) LU90183B1 (de)
NO (1) NO322452B1 (de)
PT (2) PT1091812E (de)
UA (1) UA68367C2 (de)
WO (1) WO1999032238A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100475172B1 (ko) * 2001-02-20 2005-03-08 에스케이 주식회사 원유탱크 내의 슬러지 제거 및 오일유분의 회수방법
GB0116579D0 (en) * 2001-07-06 2001-08-29 Mackrill David Cleaning apparatus and method
GB2397996B (en) * 2003-02-07 2005-01-19 Willacy Oil Services Ltd Sludge dispersal/inhibition in floating roof storage tanks
BRPI0621632A2 (pt) * 2006-05-15 2011-12-13 Petrojet Internat sistema e processo de recolocação em suspensão de um sedimento e sistema de filtração
US8931948B2 (en) 2008-10-01 2015-01-13 Bp Corporation North America Inc. Process and apparatus for mixing a fluid within a vessel
RU2443483C2 (ru) * 2010-03-26 2012-02-27 Александр Фёдорович Луцык Способ размыва донных отложений в резервуаре
BR102012015763A2 (pt) * 2012-06-26 2014-12-02 Joel Ligiero Junior Vargas Método para a limpeza de um tanque de armazenamento utilizando skimmer e uso de skimmer.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3584789D1 (de) * 1984-03-13 1992-01-16 Fiprosa Holding Verfahren zur rueckgewinnung von rohoel oder raffinerieprodukten aus zu schlammigem verdicktem bis kompaktem, sedimentiertem rohoel oder raffinerieprodukten, sowie vorrichtung zur durchfuehrung des verfahrens.
US4828625A (en) * 1987-03-09 1989-05-09 Nalco Chemical Company Apparatus and method for removal of sludge from tanks
DE4101184C2 (de) * 1991-01-17 1994-07-14 Sobinger Dietrich Verfahren und Anlage zum Reinigen von Schwimmdachtanks zum Lagern von Rohöl
US5087294A (en) * 1991-04-02 1992-02-11 Allen Rechtzigel Method and apparatus for cleaning a petroleum products storage tank
GB9508257D0 (en) * 1995-04-24 1995-06-14 British Nuclear Fuels Plc Removing liquids from tanks

Also Published As

Publication number Publication date
PT1091812E (pt) 2007-12-03
DE69738052T2 (de) 2008-05-15
UA68367C2 (en) 2004-08-16
AU5564598A (en) 1999-07-12
BR9714913A (pt) 2002-05-07
PT975148E (pt) 2007-02-28
DK1091812T3 (da) 2008-01-28
NO322452B1 (no) 2006-10-09
HK1035509A1 (en) 2001-11-30
NO20003169L (no) 2000-08-11
ES2293666T3 (es) 2008-03-16
NO20003169D0 (no) 2000-06-19
EA003659B1 (ru) 2003-08-28
WO1999032238A1 (fr) 1999-07-01
EA200000668A1 (ru) 2000-12-25
LU90183B1 (fr) 1998-04-06
DE69738052D1 (de) 2007-10-04
EP1091812A1 (de) 2001-04-18
ATE370801T1 (de) 2007-09-15

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