Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture
Patent
1997-01-03
1998-10-13
Tran, Hien
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
4232453, 422171, 422173, 422175, 422177, 422181, 422209, 110235, 110236, 165 5, 165 6, 165 8, 165 9, 165 10, 432180, B01J 800, F01J 310
Patent
active
058208364
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an improved rotating transfer device for gaseous effluents, suited for working as a heat exchanger and as a thermal and/or catalytic effect cleaner.
The invention notably applies to heat exchange systems or to systems suited for cleaning air loaded with substances such as volatile organic compounds (VOC), that can be oxidized and eliminated by thermal or catalytic incineration.
The claimant's patent application Ser. No. 94/06,282 describes a heat exchange and thermal and/or catalytic effect cleaning device for polluted gases such as VOCs. It comprises a housing or cage, a crown containing a load of solid particulate materials selected because they exhibit a large heat exchange surface (silica, granite or lighter materials such as metallic honeycomb structures or others, or cryogenic nodules for negative temperatures, etc) that is placed in the depth of the cage. The crown is split up into several parts by an inner separation or, in some cases, it serves as a support for a certain number of baskets. Motive means are used for driving the crown and the cage into a rotating motion in relation to one another about a vertical axis (either the crown rotates, the cage being stationary, or the crown is stationary and the cage rotates about it).
The prior device comprises a pipe for delivering effluents into the cage and a pipe for discharging effluents out of the cage. The crown comprises a first sector for communicating continually the delivery pipe with the central part of the cage where a first heat exchange occurs between the effluents and the load in the crown. By means of a second sector of the crown where a second heat exchange takes place between effluents and the load in the crown, the central part of the cage communicates continually with the discharge pipe.
This prior device can be used only as a simple heat exchanger or for a combined use as a heat exchanger and as an incinerator for polluted effluents. In this case, the delivery pipe receives effluents containing polluting substances. The first sector and the second sector communicate directly with one another by means of the central part of the cage. A thermal reactor possibly provided with a catalytic bed selected to bring about an exothermic reaction in the presence of the polluting substances is placed in this central part in order to bum the polluting substances in the effluents channelled by the first angular sector.
With this layout, the crown rotates between two stationary parts: the central reactor and the housing. In order to prevent leaks due to the bypassing of the central zone reactor, it is necessary to provide a double annular seal. This is obtained by imposing tight shape and concentricity tolerances during the manufacturing stage as well as during the mounting stage.
The rotating catalytic cleaning device for polluted gaseous effluents according to the invention comprises a housing or cage, a crown placed in the cage, and motive means for driving the crown into a continuous rotating motion with respect to the cage about a vertical axis, at least one pipe for delivering effluents into the cage and at least one pipe for discharging effluents out of the cage, the crown comprising at least a first sector for communicating continually the delivery pipe with the central part of the cage, and at least a second sector for communicating continually the central part of the cage with the discharge circuits and a catalytic cleaning reactor for burning the polluting substances mixed with the effluents channelled by the first angular sector.
The device is characterized in that it comprises in combination at least an annular catalytic bed arranged in the inner part of the crown over the total circumference thereof and a load of a material exhibiting a large heat exchange surface arranged in the crown, outside the catalytic bed.
With this layout, the polluted effluents (possibly preheated in an outer exchanger), after heating up in contact with the thermal mass in the outer part of the first angular sector of the crown, are cl
REFERENCES:
patent: 3870474 (1975-03-01), Houston
patent: 4310046 (1982-01-01), Michalak
patent: 4699206 (1987-10-01), Kirchmeier
patent: 5362449 (1994-11-01), Hedenhag
patent: 5643538 (1997-07-01), Morlec et al.
Bourcier Jacques
Morlec Jean
Bourcier Jacques
Institute Francais du Petrole
Tran Hien
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