Method and device for liquefaction of sediments of thickened...

B - Operations – Transporting – 08 – B

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B08B 9/093 (2006.01) B01F 5/02 (2006.01) B01F 5/10 (2006.01)

Patent

CA 2253554

The inventive method and the inventive device serve for liquefaction of sludgy to compact sediments (3) in vessels (1) in which crude oil (2) is stored and/or transported, whereby a liquid is injected above the sediment surface via nozzles (11) under the effect of which liquid the sediment (3) is at least partly liquefied or dissolved in the liquid such that it can be removed from the vessel (1) together with the liquid. For this purpose a substantially horizontally flowing liquid current which is possibly closed in itself is created above the sediment surface by directing the injection through all nozzles (11) such that the injection direction has a horizontal component which is orientated tangentially to a current line of the liquid current to be created and is orientated in flowing direction. The injected liquid is crude oil or a refinery product and differs from the lowest levels above the sediment in that it comprises a smaller share of heavy components.

L'invention concerne un procédé et un dispositif approprié permettant de liquéfier des sédiments (3) boueux à épais provenant de contenants (1) où du pétrole brut (2) a été stocké et/ou transporté. Selon le procédé, un liquide est injecté au-dessus de la surface des sédiments par des injecteurs (11) et entraîne une liquéfaction au moins partielle des sédiments (3) ou ledit sédiment se dissout dans le liquide, de manière à pouvoir être extrait du contenant (1) conjointement avec le liquide. A cette fin, un flux de liquide sensiblement horizontal, fermé dans certaines circonstances, est produit, du fait que le sens d'injection de tous les injecteurs (11) est orienté de manière à avoir une composante horizontale, dirigée de manière tangentielle par rapport à une ligne d'écoulement du flux de liquide à produire et dans le sens d'écoulement. Le liquide injecté est du pétrole brut ou un produit de raffinerie et se différencie des couches de liquide situées le plus bas sur les sédiments, en ce qu'il contient une proportion plus réduite de constituants lourds.

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