Gas separation – Deflector – Plural deflectors overlapped and spaced serially in gas flow
Patent
1990-11-26
1992-01-21
Nozick, Bernard
Gas separation
Deflector
Plural deflectors overlapped and spaced serially in gas flow
55DIG37, B01D 4500
Patent
active
050824775
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a separator for separating solids from a gas flow, especially solids in an ascending gas flow from a fluidized bed furnace, that contains solids and ascends in a channel delimited by multiple walls, whereby the separator comprises at least two layers of staggered trapping chutes of an essentially U-shaped cross-section, with the trapping chutes being slanted towards a wall and open against a flow direction of said gas flow and having chute-like pockets provided at the free ends of their inner flanks which guide solids separated by the trapping chutes towards the wall.
Such a separator has been proposed in the German patent application P 36 40 377.6-41, filed Nov. 26, 1986, in which the lower ends of the trapping chutes, which are adjacent to the walls, end in a common collecting or combining funnel or end at the wall. The distributing funnel may be equipped with a downwardly extending recirculating channel. However, the effectiveness of the separator may be reduced by by-pass currents in the recirculating arrangement for the separated solids and/or between the individual trapping chute layers. These by-pass currents may be generated by pressure gradients above the layers of trapping chutes.
It is therefore an object of the present invention to provide a separator of the aforementioned kind in which the removal of the separated dust is improved.
SUMMARY OF THE INVENTION
This object is achieved by providing outlet channel pieces at the lower end of each trapping chute adjacent to the wall with the outlet channel pieces extending to the wall and having a slot-like outlet opening at the wall which opens downward, and by providing, between each outlet channel piece of each layer of trapping chutes, sheet metal deflectors which are spaced from one another and spaced from the wall and delimit between them at least one slot for the passage of gas.
The outlet channel piece ascertains a safe reversal and recombination of the two drainage flows discharged from the chute-like trapping pockets. The possible combination of the two discharge flows into one common discharge flow of a higher concentration in conjunction with the slot-like outlet openings improves the dust recycling against the gas flow ascending along the wall.
Due to at least one slot defined between the sheet metal deflectors, a pressure equilibration between the two individual trapping chute layers is achieved, on the one hand, and, to a large extent, a reduction of the circulation of the by-pass currents in one individual layer is made possible, on the other hand.
Preferably, the edges of the outlet openings of the outlet channel pieces that are adjacent to the wall, and the edges of the sheet metal deflectors are angled downward in order to provide defined stream conditions. The outlet opening of each outlet channel piece may be delimited by the wall, i.e., the wall forms the face of the outlet channel piece. It is also possible, however, to close the end of the outlet channel piece or connecting channel piece that faces the wall with a wear resistant sheet metal face in order to reduce erosion of the wall caused by the recycled solids.
In order to further improve the reversal of the separated solids from the trapping chute in the direction of the wall, it is advantageous to slant the connecting channel piece further downward relative to the trapping chute which is already slanted towards the wall.
To prevent a by-pass current against the transport direction of the solids, which may be caused by the connecting channel piece, it is advantageous, to at least partially close the trapping chute at its end facing the connecting channel piece leaving openings that correspond to the size of the outlet cross-sections of the trapping pockets. Thereby the by-pass current may be adjusted via the degree of closing of the trapping chute.
It is also advantageous that the slant and, if necessary, the position of the sheet metal deflectors, that are arranged spaced from each other, corresponds to the sl
Thielen Walter
Thomas Gerhard
L & C Steinmuller GmbH
Nozick Bernard
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