Reduction of fouling in heat exchangers

F - Mech Eng,Light,Heat,Weapons – 28 – F

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F28F 19/02 (2006.01) F28G 7/00 (2006.01)

Patent

CA 2655295

A method for reducing the formation of deposits on the inner walls of a tubular heat exchanger through which a petroleum-based liquid is flowing comprises applying one of fluid pressure pulsations to the liquid flowing through the tubes of the exchanger and vibration to the heat exchanger to effect a reduction of the viscous boundary layer adjacent the inner walls of the tubular heat exchange surfaces. Reduction of the viscous boundary layer at the tube walls not only reduces the incidence of fouling with its consequential beneficial effect on equipment life but it also has the desirable effect of promoting heat transfer from the tube wall to the liquid in the tubes. Fouling and corrosion are further reduced by the use of a coating on the inner wall surfaces of the exchanger tubes.

L'invention concerne un procédé de réduction de formation de dépôts sur les parois intérieures d'un échangeur de chaleur tubulaire dans lequel circule un liquide à base de pétrole. Ledit procédé consiste à appliquer des pulsations de pression au liquide circulant dans les tubes de l'échangeur ou une vibration sur l'échangeur de chaleur afin d'obtenir une réduction de la couche limite, visqueuse, adjacente aux parois intérieures des surfaces d'échange de chaleur tubulaires. La réduction de la couche limite, visqueuse, sur les parois de tubes réduit non seulement l'incidence d'un encrassement avec par conséquent un effet bénéfique sur la durée de vie de l'équipement mais elle présente également l'effet souhaité de promouvoir le transfert de chaleur de la paroi de tube vers le liquide circulant dans les tubes. L'encrassement et la corrosion sont également réduits par l'utilisation d'un revêtement sur les surfaces de parois intérieures des tubes échangeurs.

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