Self-cleaning mechanism for oxidation chamber

B - Operations – Transporting – 01 – J

Patent

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B01J 19/08 (2006.01) A23L 3/28 (2006.01) B01J 19/12 (2006.01) C02F 1/32 (2006.01) G21K 5/02 (2006.01)

Patent

CA 2093018

An oxidation chamber used for irradiating an incoming liquid containing unwanted organic pollutants has a structure that facilitates self-cleaning at intervals. A modular construction is used, and three basic types of modules (12, 14, and 16) are employed. One of the modules (16) is a TEFLON ? lined carbon steel pipe through which a shuttling scraper is forced at intervals. The shuttling scraper includes an annular wiper (60) that simultaneously cleans the inside surface of the surrounding tubular module (16) as well as the ouside surface of enclosed quartz tube (36). The annular wiper sealingly engages the quartz tube and the tubular module so that it is driven like a piston by the full pressure of the liquid. When the shuttling scraper has reached the end of the tubular module, it parks itself in a position that causes only minimal pressure drop. This automatic self-cleaning feature of the oxidation chamber overcomes one of the most serious problems encountered with this type of equipment, namely the tendency of a slime to form on the UV lamps and on the normally reflective walls of the chamber, thereby reducing the amount of UV radiation reaching the liquid. When this occurred in prior art apparatus, it was necessary to shutdown the operation and to dismantle the oxidation chamber to clean the lamps and chamber walls.

nceinte d'irradiation pour l'oxydation de liquides contaminés par des polluants organiques, de construction permettant l'auto-nettoyage périodique. La construction, de type modulaire, comporte trois principaux types de modules (12, 14 et 16). Un des modules (16) est un tube en acier au carbone à revêtement intérieur en TEFLON ? dans lequel se déplace un racleur. Ce dernier est muni d'une lame annulaire (60) servant à nettoyer en même temps la paroi interne du module tubulaire (16) et la surface externe d'un tube de quartz (36) logé dans ledit module. La lame annulaire est en contact intime avec la paroi du module tubulaire et la surface du tube de quartz, de sorte que le racleur est actionné à la manière d'un piston par la pression du liquide dans le module tubulaire. Lorsque le racleur atteint l'extrémité du module tubulaire, il s'immobilise dans une position qui n'a que peu d'effet sur la pression à l'intérieur du module. Cette fonction d'auto-nettoyage automatique apporte une solution à l'un des problèmes majeurs que pose ce type d'appareils, soit la formation d'un film visqueux sur les lampes UV et les parois généralement réfléchissantes de l'enceinte, qui nuit à la transmission des UV. Lorsqu'un tel film se forme dans les appareils d'oxydation existants, il est nécessaire d'arrêter l'appareil et de démonter l'enceinte d'oxydation pour en nettoyer les parois et les lampes.

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