Gas separation: apparatus – With gas and liquid contact apparatus – Having contact liquid level maintaining means
Reexamination Certificate
1997-10-15
2001-07-31
Bushey, C. Scott (Department: 1724)
Gas separation: apparatus
With gas and liquid contact apparatus
Having contact liquid level maintaining means
C096S273000, C096S280000, C096S333000, C096S358000, C261S114300
Reexamination Certificate
active
06267805
ABSTRACT:
The invention relates to an apparatus for scrubbing a flow of gas charged with solid particles.
More particularly, the invention relates to an apparatus for scrubbing with water a flow of gas charged with solid or semi-solid particles.
BACKGROUND OF THE INVENTION
Certain known types of such apparatuses operate on the principle of mixing the gas charged with solid particles with scrubbing water in the form of a spray whose fineness may be varied, so that the solid or semi-solid particles are collected by the droplets of scrubbing water. The scrubbed gas is then exhausted on one side, while the scrubbing water and the collected solid particles are recovered on another side.
A known type of such apparatus includes water-spraying devices situated in or in the vicinity of the flow of gas to be scrubbed, and combined with throat devices such as perforated plates or the like. Mixing of the gas with the scrubbing water is generated by the speed of the gas passing through the throat device. At the periphery of the flow, this speed causes induction of the scrubbing water which is entrained in the downstream flow. Such apparatus generally includes a plurality of scrubbing stages in series so that the head loss of the flow of gas per stage remains acceptable for good mixing. Each stage includes a throat device, e.g. of the perforated plate type, and at least one set of scrubbing water sprayers. The particles collected from the flow of at least partially scrubbed gas are separated from the scrubbing water by inertia. Such an apparatus also includes a closed circuit device for recycling and re-using the scrubbing water. The charged scrubbing water is therefore conveyed from stage to stage towards a settling tank or the like, where it is recycled prior to being sent back to the spray devices.
To ensure that the apparatus is properly effective, the water must be distributed properly by the sprayers, and this means that spray nozzles having small cross-sectional areas must be used. Unfortunately, the recycled scrubbing water is never entirely free of particles, or even large-volume agglomerations of particles that did not settle out during recycling. These impurities are entrained back to the spray devices with the recycled scrubbing water, and they form deposits on the inside of the spray devices, or they even partially or totally block the spray nozzles. Naturally, this reduces the effectiveness of the apparatus.
After the particles have been collected, they form agglomerations which constitute most of the residue obtained by the apparatus. If such agglomerations are not removed as they are formed, they increase in volume, and, when the apparatus is stopped, they are deposited and become stuck inside the scrubbing chambers of each stage. Naturally, the complexity of the return circuit for the scrubbing water charged with agglomerations is increased by the presence of multiple scrubbing stages.
OBJECTS AND SUMMARY OF THE INVENTION
An object of the present invention is to provide an apparatus for scrubbing with water a flow of charged gas that does not require sprayers for the scrubbing water.
Another object of the present invention is to provide an apparatus in which the gas/water mixing is optimized so that only one scrubbing stage is required.
Another object of the present invention is to provide an apparatus that improves removal of the charged scrubbing water, and that feeds the mix with scrubbing water that is cleaner.
To this end, the invention provides an apparatus for scrubbing with water a continuous flow of charged gas that is charged with solid or semi-solid particles, the apparatus including: a scrubbing chamber delimited by a side wall; inlet means via which the scrubbing water is fed into the scrubbing chamber; scrubbing throat means for mixing the scrubbing water with the charged gas in the scrubbing chamber; removal means for removing the scrubbing water and the collected particles; and removal means for removing the continuous flow of at least partially scrubbed gas.
According to the invention, the inlet means for the scrubbing water are means for feeding the scrubbing water into the scrubbing chamber while the water is not in the form of a spray, the scrubbing throat means comprise a bottom plate that is perpendicular to the continuous flow of charged gas, and that is provided with at least one longitudinal slot extended, at least on that side of the plate which is closer to the scrubbing chamber, by two walls forming a longitudinal adjutage, said longitudinal slot constituting an inlet via which the continuous flow of charged gas enters the scrubbing chamber, and wherein the removal means for removing the scrubbing water and the collected particles comprise at least one overflow projecting from the bottom plate towards the scrubbing chamber.
The overflow has an overflow height that is not less than the height of the longitudinal adjutage.
Advantageously, the bottom plate is provided with a plurality of longitudinal slots that are parallel to one another, each of which is extended by a longitudinal adjutage.
In an embodiment of the invention, the longitudinal adjutage has a cross-section in the general shape of a trapezium, with the small base adjoining the plate.
In another embodiment of the invention, the longitudinal adjutage has a cross-section in the general shape of two trapeziums, the small base of the first trapezium adjoining the plate, the second trapezium extending the first trapezium, and the small base of the second trapezium adjoining the large base of the first trapezium.
Advantageously, the scrubbing throat means further include a splitter situated downstream from the longitudinal adjutages and provided with a plurality of through orifices via which a compound continuous flow made up at least of scrubbing water and of the continuous flow of charged gas can pass into the scrubbing chamber.
According to a characteristic of the invention, each longitudinal adjutage is flanked on either side by longitudinal walls projecting from the bottom plate towards the scrubbing chamber. These walls have a height that is greater than the overflow height of the removal means for removing the scrubbing water and the collected particles and are provided with feed openings for feeding the corresponding longitudinal adjutage. These openings are situated in the vicinity of that edge of each of the longitudinal walls which adjoins the bottom plate.
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Cordier Andre
Eyraud Alain
Pierin Christophe
Sedaries Didier
Bushey C. Scott
Societe Anonyme dite Air Industrie Systemes - A.I.S.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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