Agitating – Having specified feed means – Pump forces material through restriction
Patent
1993-09-09
1994-11-22
Jenkins, Robert W.
Agitating
Having specified feed means
Pump forces material through restriction
366338, B01F 506
Patent
active
053662881
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for mixing a suspension of a cellulosic fibrous material and a fluid, comprising a housing with a center line and inlet and outlet for the fibre suspension, said inlet and outlet being spaced axially from each other with respect to the center line of the housing; inlet means for the supply of said fluid to the fibre suspension; and two cooperating wall means arranged in the housing at a distance from each other, said wall means having sides facing each other which between them define a gap-shaped space through which the fibre suspension shall flow and has an inlet opening and an outlet opening communicating with said inlet and outlet, respectively, for the fibre suspension.
BACKGROUND OF THE INVENTION
Description of the Prior Art
Apparatus for mixing pulp and fluid, e.g. oxygen or ozone, is known through SE 436 652, SE 459 904, SE 462 857, U.S. Pat. No. 3,095,349 and U.S. Pat. No. 4,886,577, for instance. In the known apparatus one of the gap-forming wall elements is arranged to rotate and therefore requires a driving motor and foundation for its installation. These apparatus therefore require relatively much place and the installation is relatively time-consuming. Furthermore, it is impossible to automatically alter the through-flow area of the gap during operation in order to set optimal mixing conditions and capacity or to remove any clogged fibre material without dismantling the apparatus.
When bleaching pulp with ozone, for instance, relatively large amounts of gas containing ozone must be added since the carrier gas can only contain limited quantities of ozone. Furthermore, it must be taken into account that ozone reacts extremely quickly with the pulp and must therefore be mixed with it so that if possible all parts of the pulp are treated with ozone. In the known apparatus as described in the above-mentioned patent specification relating to mixing in ozone, the ozone is supplied to the pulp at one or more points as it flows past the supply points so that certain parts of the pulp are mixed with ozone while other parts are not treated with any ozone, or only with a limited quantity due to insufficient mixing effect in the apparatus and/or because all or almost all the ozone has been consumed when the carrier gas reaches these other parts of the pulp as well.
SUMMARY OF THE INVENTION
The object of the present invention is to greatly reduce the above-mentioned problems and to achieve an improved apparatus for mixing pulp and fluid, which does not have a motor-driven rotating part, so that the apparatus is compact and simple in structure as well as being easy install; which enables large quantities of fluid to be supplied continuously to the pulp so that at least the majority of the pulp is supplied with fluid and this is mixed with the pulp during one and the same brief period of time, e.g. from almost 0 to 2 seconds; and which preferably also enables automatic control of the gap during operation in order to alter the through-flow area of the gap and the flow through the apparatus.
The invention is substantially characterized in that the wall means are arranged concentrically in the housing and are non-rotatable, said opposite sides thereof being arranged to extend around the center line of the housing. spaced therefrom, the gap-shaped space thus acquiring the shape of a concentric annular gap, which annular gap preferably has an extension in excess of 20 mm in the main flow direction of the medium flowing through it, and that the housing includes a distribution chamber communicating with and being arranged axially upstream of the annular gap in order to distribute the fibre suspension uniformly around the entire concentric inlet opening of the annular gap.
The invention will be described further with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side view, partly in section, of an apparatus according to a first embodiment of the invention.
FIG. 2 shows a longitudinal section through parts of the apparatu
REFERENCES:
patent: 4352573 (1982-10-01), Pandolfe
patent: 4660986 (1987-04-01), Leschonski
patent: 4952067 (1990-08-01), Dallas
Dahllof Hakan
Ekholm Rolf
Jansson Ulf
Jenkins Robert W.
Kamyr Aktiebolag
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