Paper making and fiber liberation – Processes and products
Patent
1986-08-20
1990-10-23
Chin, Peter
Paper making and fiber liberation
Processes and products
162 57, 162380, 137597, 137883, 366150, 366154, 366155, 366156, F16L 5518
Patent
active
049649507
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method and an apparatus for dividing and uniting the flows of high-consistency fibre suspensions.
The pulp industry often requires that fibre suspension is conveyed from a vessel or a pipe continuously or intermittently divided evenly or in a desired manner to several different places, e.g. from a storage tank to two or more processing devices. When the consistency of the suspension is low, i.e. up to approx. 5 per cent, no problems arise, but when the consistency is higher there is little free liquid between the fibres and the fibres form a fibre network the situation is quite different.
When the consistency is high, e.g. from 8 to 15 per cent, the fibre suspension forms a strong fibre network and dividing and uniting fibre suspensions in a pipe line is often impossible without special measures. When a high-consistency fibre suspension arrives at a junction point in the pipe line, the fibre network may be too strong to be dispersed. It is possible that the fibre network sticks to a part of the pipe which results in precipitation and clogging of the pipe line. When one branch of the pipe line is not in use and is closed by a valve, the portion of the pipe preceding the valve is easily clogged and does not open when the valve is opened.
Because of the strong fibre networks, high-consistency pulp flows from branch pipes can not be combined in a pipe line. Without special measures the fibre networks prevent two flows of a smaller diameter from forming a flow with a larger diameter.
The above problems in dividing and uniting the flows are avoided by subjecting the flow to such an intensive field of shear forces that the bonds between the fibres are broken and a turbulent flow is created where no fibre networks preventing the division and combination of the suspensions exist. The shear forces can be created by the geometry of the junction point or by a rotor.
The object of the present invention is to provide a method and an apparatus by which the flow of a fibre suspension of the consistency of 5 to 20 per cent can be divided and united in a controlled manner.
The use of turbulence to disrupt fibre bonds is previously disclosed e.g. in Finnish Patent No. 51116 and Finnish patent application no. 781071.
The former of these publications discloses a pulp distributor connected to a sheet formation device in which the flow is accelerated in a tapering portion of a pipe and is caused to impinge at high speed against a wall which forces the flow radially outwards to the outlets disposed around the impingement area.
The latter of the publications discloses a device for removing pulp from a vessel in which a pump connected to the outlet of the pulp vessel is provided with a rotor extending into the vessel.
The main characteristic feature of the present invention is that the fibre suspension is caused to flow into a space uniting the inlet and the outlet flows in which space a vortex flow is created to prevent a still pocket like state of the suspension.
The vortex flow is preferably created by a rotor.
The apparatus for carrying out the invention is characterized by a vortex chamber provided with inlets and outlets.
The invention is described in detail below with reference to the accompanying drawings which illustrate preferred embodiments of the apparatuses for carrying out the method of the invention.
FIG. 1 is a longitudinal cross section along line B-B of the distributor of FIG. 2.
FIG. 2 is a section along line A--A of FIG. 1.
FIG. 3 is a section along line D--D of FIG. 4 illustrating an other embodiment of a distributor.
FIG. 4 is a section along line C--C of FIG. 3.
FIG. 5 is a section along line F--F of FIG. 6 illustrating a third alternative embodiment of a distributor.
FIG. 6 is a section along line E--E of FIG. 5.
FIG. 7 is a section along line H--H of FIG. 8 illustrating a fourth embodiment of a distributor.
FIG. 8 is a section along line G--G of FIG. 7.
In the distributor 1 illustrated in FIGS. 1 and 2, the numeral 2 refers to a vortex chamber the wall 3 of which is provid
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Niskanen Toivo
Reponen Voitto
A. Ahlstrom Corporation
Chin Peter
Dang Thi
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