Dispensing – Fluid flow discharge – From movable trap chamber
Patent
1988-07-20
1990-03-27
Shaver, Kevin P.
Dispensing
Fluid flow discharge
From movable trap chamber
222264, 222368, 222148, 406 52, 239555, G01F 1100
Patent
active
049113402
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement of the type as defined in the appended main claim.
An injection mechanism usually comprises at least one chamber which serves as a dosing unit and which is arranged in conjunction with a member movable relative to an adjacent member. The chamber is adapted to be alternately connected to (a) a vacuum source for evacuation of the air, (b) a supply of powder to be injected, and (c) both a pressure gas source and an outlet duct.
The vacuum is used for filling the chamber with powder which, in a subsequent step, is ejected by pressure gas.
Injection mechanisms of this type are much used for the dosing of powders. One application is the injection of solid fuel powder into Otto engines, diesel engines, gas turbines, furnaces and other combustion units.
Injection mechanisms can also be used for injection of adsorbing or absorbing powders into air or gases, e.g. adsorbing powder into air mixed with solvents, the powder consisting of activated carbon or zeolites. In combustion units, lime powder can be injected to bind SO.sub.2. If the combustion gases can be cooled to 40.degree. C. and lower, even NO.sub.x and polyaromatic hydrocarbons can be adsorbed by activated carbon powder.
One problem with powder having a small particle size is its tendency to agglomerate. An injection mechanism providing a pulsating flow eliminates this tendency, and it has been shown that by choosing a suitable pulse repetition frequency, a complete separation of the powder grains or particles can be achieved. For example, for lime powder having a particle size of 0-10.mu., the pulse repetition frequency should be 55 Hz.
An injection mechanism of the above type is disclosed in Swedish patent 386,955. Powders of solid substances, such as wood, peat, coal and brown coal, used as fuel, cause heavy wear, and this applies to an even higher extent also to powder of activated carbon, zeolites and lime intended for other purposes.
The object of this invention is to provide an arrangement which eliminates not only the wearing effect of the powder passing through, but also the problem of establishing a reliable seal between mutually movable parts.
The characteristic features of the arrangement according to the invention are stated in the appended claims.
Thus, the basic idea of the invention resides in the provision of gaps of adjustable and controllable width between mutually movable parts, i.e. a rotatable intermediate disc and, on both sides thereof, fixed discs.
One embodiment of the arrangement according to the invention will be described in greater detail below, reference being had to the accompanying schematic drawings in which:
FIG. 1 is an axial cross-section of the main components of the injection mechanism;
FIG. 2 shows a stationary upper disc included therein, as seen from below;
FIG. 3 is a cross-section of the same disc along line B--B in FIG. 2;
FIG. 4 is a top plan view of a rotatable intermediate disc;
FIG. 5 is a cross-section of the same disc along line C--C in FIG. 4;
FIG. 6 is a top plan view of a stationary lower disc, and
FIG. 7 is a cross-section of the same disc along line A--A in FIG. 6.
The drawing merely shows the components which are necessary for the understanding of the invention, and any auxiliary equipment, such as the driving gear, the apparatus housing and the like, has been omitted. The pipes etc. connected to the injection mechanism have been indicated schematically only.
The main components of the injection mechanism are three discs, an upper disc I, an intermediate disc II and a lower disc III, all of which have a number of throughholes disposed along the same circular arc, which causes the holes to overlap each other in their different turning positions. The upper disc I comprises four such holes, of which two opposing holes 1 are connected to pipes 1A for feeding powder from a suitable powder container, and two holes 2 are connected to one or more injection nozzles or the like via pipes 2A.
The lower disc III has six holes opposing each other in pairs, of which t
REFERENCES:
patent: 1994239 (1935-03-01), Beekhuis
patent: 3126132 (1964-03-01), Lyon et al.
patent: 3964513 (1976-06-01), Molner
patent: 4227835 (1980-10-01), Nussbaum
patent: 4463736 (1984-08-01), Hayward, Jr.
Bengt Gunnar Tornqvist
Reiss Kevin P.
Shaver Kevin P.
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