Cleaning using welding lances and blasting media

B - Operations – Transporting – 08 – B

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B08B 5/02 (2006.01) F27D 25/00 (2010.01) B08B 9/093 (2006.01) F23J 1/00 (2006.01) F23J 3/00 (2006.01) F28G 1/12 (2006.01) F27D 3/16 (2006.01) F27D 9/00 (2006.01)

Patent

CA 2361705

It is possible to clean high temperature (over 400, e.g. over 1000, degrees F) surfaces in a time and cost efficient manner by using a liquid-cooled ceramic welding lance (11) to direct (at super-atmospheric pressure) a blasting media at the surfaces to be cleaned. The blasting media (23) is preferably combustible at the temperature of the environment surrounding the surfaces, and may include one or more organic agricultural abrasive materials (preferably black walnut shells) as the sole or primary constituent. Blasting may be practiced by directing the media at the surfaces to be cleaned (15) at a pressure of between about 40-100 psi, for example continuously for as long as is necessary (e.g. more than 30 minutes), without any need to remove the lance (11) from the environment. The method is desirably practiced to clean, while in operation or in situ, metal surfaces having scale buildup which adversely affects the ability of the metal surfaces to transfer heat, reheat tubes, process tubes, furnace surfaces, or the like.

Il est possible de nettoyer des surfaces à température élevée (400-1000 degrés F) de façon rapide et efficace au moyen d'une lance (11) servant à souder la céramique et refroidie par un liquide afin de diriger (à une pression sub-atmosphérique) un agent décapant (23) vers les surfaces à nettoyer. Cet agent décapant (23) est, de préférence, combustible à la température de l'environnement entourant ces surfaces et peut comprendre un ou plusieurs matériaux abrasifs organiques agricoles (de préférence, des coques de noix noires) en tant que seul constituant ou constituant de base. Le décapage peut consister à diriger l'agent décapant vers les surfaces à nettoyer (15) à une pression située entre 40-100 psi, pendant, par exemple, une durée aussi longue que nécessaire (supérieure à 30 minutes) sans enlever la lance (11) de l'environnement. Ce procédé sert à nettoyer, de manière avantageuse, des surfaces métalliques, montées ou démontées, présentant une accumulation de dépôts exerçant un effet négatif sur leur capacité de transfert de chaleur, des conduits de réchauffement ou des canalisations de traitement.

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