Method and apparatus for pumping cellulose pulp
AssigneeA. Ahlstrom Corporation
InventorJukka Timperi
Life of this patent
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Abstract
Pumping of medium consistency cellulose pulp is effected from stand pipes or like small sized pulp vessels to which pulp is normally discharged from storage towers, treatment towers, washers, filters, presses, thickeners, or the like, particularly pumping of high temperature pulps from said stand pipes. A pump inlet is attached to a discharge opening of a stand pipe, pressurizing cellulose pulp in said stand pipe by closing the stand pipe off from the atmosphere, maintaining a superatmospheric pressure in the stand pipe, allowing the cellulose pulp to flow into the pump through the pump inlet, and pumping the cellulose pulp further using the pump.
Claims12
A method of pumping cellulose pulp having a consistency of between about 8-18% by utilizing a pump having a pump inlet and a stand pipe with a discharge opening, comprising the steps of:
- (a) attaching the pump inlet to the discharge opening of the stand pipe;
- (b) closing the stand pipe from the atmosphere;
- (c) pressurizing cellulose pulp having a consistency of between about 8-18% and feeding the pulp at a consistency of 8-18% under pressure into the stand pipe to establish a level of pulp in the stand pipe and a gas space above the pulp level, and maintaining a superatmospheric pressure in the stand pipe gas space;
- (d) causing the cellulose pulp to flow into the pump through the pump inlet;
- and
- (e) pumping the cellulose pulp, at substantially the same consistency between about 8-18% as the pulp feed into the stand pipe in step (d), away from the stand pipe using the pump.
A method of pumping cellulose pulp having a consistency of between about 8-18% by utilizing a pump having a pump inlet and a stand pipe with a discharge opening, comprising the steps of:
- (a) attaching the pump inlet to the discharge opening of the stand pipe;
- (b) closing the stand pipe from the atmosphere;
- (c) establishing a level of pulp in the stand pipe, and a gas space above the level of pulp;
- (d) causing the cellulose pulp to flow into he pump through the pump inlet;
- (e) pumping the cellulose pulp away from the stand pipe using the pump;
- (f) separating gas from the pulp in the pump;
- and
- (g) introducing the separated gas from the pump to the gas space in the stand pipe to at least assist in maintaining a superatmospheric pressure in the stand pipe so as to minimize the amount of steam created by action of the pump on the pulp.
Dependencies are inferred from the claim text.