Device for introducing a dosed quantity of powder into a carrier

Conveyors: fluid current – With diverse power-driven conveyor – Rotary

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Details

406 66, 406135, 406141, 222331, B65G 5346

Patent

active

047462507

DESCRIPTION:

BRIEF SUMMARY
This invention relates to an apparatus for the dosed incorporation of a dustlike solid substance into a carrier gas stream.
Such an apparatus is known from the German Auslegeschrift No. 27 28 386. This printed matter shows and describes an apparatus in the case of which the dustlike solid is stored in loose form in a reservoir, where it may be loosened, if need be, with gas. A slowly rotating shaft is immersed in the dustlike solid, the shaft carrying a disc thin in comparison with the diameter. In an annular zone relatively far outside, said disc is provided with a rim of small passage holes parallel in axis. Upon rotation of the disc through the dustlike solid, the passage holes are filled therewith. A carrier gas line parallel in axis terminates in at least one point on the disc to permit the carrier gas to blow the dustlike solid out of the passage holes met by the carrier gas stream. In the extension of the carrier gas line, on the other side of the disc, there is provided a discharge line for transporting the carrier gas and the dustlike solid taken up by the carrier gas away. Both lines are sealed against the disc by means of slide ring sealings.
Since the diameter of the passage holes in the disc is very small in comparison with the flow area of the carrier gas and since the passage holes are disposed in close proximity with respect to one another, a non-pulsating conveying is achieved with this apparatus. A disadvantage, though, results from the fact that this apparatus can only be employed in cases where the throughput of solids is small, while greater throughputs of solids are not possible at all. It is true that in order to increase the throughput of solids, the number of disc revolutions can be increased. Up from a particular speed, however, the individual holes are no longer completely filled and finally, a further increase in speed no longer results in a higher throughput of solids at all. A test made by the inventor to increase throughput performance by increasing the thickness of the disc failed, since, as was found, the dustlike solid only enters the individual holes at a limited rate and fills them. Hence, when the thickness of the disc is increased, the speed of the disc is to be reduced accordingly in order to still obtain a sufficient filling of the holes.
It is an object of the present invention to improve an apparatus of the type described hereinbefore such that, related to the same blow-out area, the throughput of solids is increased by many times over, while a nonpulsating operation is maintained.
Compared with the prior known apparatus, there are only a few passage holes disposed in the blow-out area of the apparatus according to the invention, this area being defined at the cross-section, the carrier gas line has at the point of opening in the region of the disc. Despite the reduced number of passage holes located in the blow-out area, a non-pulsating solid incorporation into the carrier gas stream is acquired.
The invention makes use of the knowledge that, when the passage holes are of suitable design and construction, the carrier gas issuing into the respective hole creates a turbulence in said hole as soon as only a fragment of the hole cross-section is exposed to the carrier gas stream. This turbulence results in a uniform blowing out operation of the hole, which is already finished, when only one third of the hydraulic cross-section of the hole is exposed to the blow-out area. The turbulence formation referred to and a stream suited for the blowing out operation, however, can only be achieved when the stagnation pressure of the carrier gas in the passage holes consists in a specific minimum pressure.
A preferred embodiment of the present invention shall now be described in detail with reference to the accompanying drawings, wherein
FIG. 1 is an illustration under report of an apparatus to be used with pulverized coal;
FIG. 2 shows a detail of the apparatus according to FIG. 1 in the region of the disc;
FIG. 3 shows a top view of a sliding sealing ring;
FIGS. 3(A) and 3(B) s

REFERENCES:
patent: 2314031 (1943-03-01), Colburn
patent: 2712963 (1955-07-01), Edwards
patent: 2740672 (1956-04-01), Morrow
patent: 3318641 (1967-05-01), Mommsen
patent: 4200414 (1980-04-01), Link
patent: 4560094 (1985-12-01), Eales
patent: 4646943 (1987-03-01), Hafner
patent: 4661024 (1987-04-01), Hafner

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