Paper making and fiber liberation – Apparatus – Digester
Patent
1997-04-17
1998-06-09
Silverman, Stanley S.
Paper making and fiber liberation
Apparatus
Digester
162243, 422135, 422270, 96155, D21C 910, D21C 708, B01D 1900
Patent
active
057627606
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a reactor for treating a pulp with a gas, comprising a pressurized vertical vessel and an outlet member at the top of the vessel and comprising a blow line for transferring gas-treated pulp to a blow vessel.
BACKGROUND AND SUMMARY OF THE INVENTION
Pulp is treated in a known manner with a gas in a reactor vessel and is discharged from the top of the reactor vessel to a blow tank, via a blow line provided with a valve, together with high contents of residual gas which usually consists of unreacted treatment gas and possibly carrier gas. A problem which often arises during this discharging from the pressurized reactor vessel is that shocks and vibrations occur in the blow line. The reason is that the pulp and the residual gas are not homogeneously mixed as they pass through the blow line. The drop in pressure across the blow valve for a constant flow is essentially dependent on the ratio between pulp and gas. Since there are instantaneous variations in this ratio, this therefore means that there are instantaneous changes in the flow velocity in the blow line. All such changes in the flow velocity in a pipe system involve changes in the motional impulse of the pulp, which causes so-called pressure shocks.
The object of the present invention is to provide a reactor with outlet member which substantially reduces the abovementioned problems.
The reactor according to the invention is characterized in that the outlet member comprises a cylindrical housing which is in open communication with the vessel and to which the said blow line is connected; a rotor rotating in the housing for separating gas and pulp from each other by means of the rotor being arranged to throw pulp in the direction of the inner side of the housing in order to be discharged to the blow line, while gas accumulates in the centre of the housing; a drive unit for driving the rotor via its rotor shaft; and a gas outlet system which comprises an outlet channel which extends through the rotor shaft from the centre of the rotor, and an outlet line which is in communication with the said outlet channel for removal of gas from the centre of the housing.
BRIEF DESCRIPTION OF THE DRAWING
The invention will be described in greater detail with reference to the drawings.
FIG. 1 is a side view of the upper part of a reactor according to the invention.
FIG. 2 is a sectional view of the outlet member of the reactor shown in FIG. 1 according to a first embodiment.
FIG. 3 is a sectional view of an outlet member according to a second embodiment.
FIG. 4 is a view corresponding to the line IV--IV in FIG. 3.
DETAILED DESCRIPTION
Referring to FIG. 1, the latter shows an upper portion of a reactor which has a vertical vessel 1 and an outlet member 2 which is connected to the top of the vessel and which comprises a blow line 3 which is connected to a blow vessel (not shown). The blow line 3 has a valve 4. The outlet member 2 moreover comprises a cylindrical housing 5 which is securely mounted by means of a lower flange 6 on the top of the reactor vessel 1. As is shown in greater detail in FIG. 2, the housing 5 is mounted in association with an outlet opening 7 in the reactor vessel 1 so that the reactor vessel 1 is in open communication with the housing 5. The outlet member 2 additionally has a drive unit 8, a bearing and sealing unit 9 and a rotor 10 (FIG. 2). The bearing and sealing unit 9 is securely mounted by means of a lower flange 11 on an upper flange 12 of the housing 5. The drive unit 8 is supported by a stand 13 which is connected securely to the lower flange 11 of the bearing and sealing unit 9. The drive unit 8 has an electric motor 14 which does, for example, about 1500 rpm, and a drive shaft 15 which is connected to a shaft 27 of the rotor, which rotor shaft is coaxial with the vertical centre line of the reactor vessel and extends through the bearing and sealing unit 9, through an upper space 16 and through a horizontal partition wall 17 which divides the housing 5 into the said upper space 16 an
REFERENCES:
patent: 4362536 (1982-12-01), Gullichsen
patent: 4410337 (1983-10-01), Gullichsen et al.
Ekholm Rolf
Jansson Ulf
Fasth Rolf
Fortuna Jos'e A.
Kvaerner Pulping AB
Silverman Stanley S.
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