Method and apparatus for facilitating the discharge of pulp
AssigneeA. Ahlstrom Corporation
InventorsReponen Voitto, Timperi Jukka, Vesala Reijo, Vikman Vesa
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Abstract
A method of facilitating the discharge of high consistency pulp from a pulp containing space such as a mass towe or the like and for treating pulp therein, includes a rotor (10) arranged in a high consistency pulp containing space (2) for breaking up pulp planks (7) and for homogenizing the pulp thereby facilitating the flow thereof toward the impeller of a pump (5).
Claims25
A method of facilitating the discharge of a high consistency cellulose fiber pulp having a consistency of from about 8% to about 25% from a high consistency pulp containing space, which space constitutes one of a mass tower and a drop leg and for treating said pulp in said space, said method comprising:
- introducing said high consistency pulp including non-homogeneous pieces of pulp having pockets filled with air therebetween into said space in a substantially vertical direction;
- withdrawing said pulp from said space in a direction transverse to said vertical direction of introduction by using a pumping means with a suction opening connected transversely to said space for pumping said pump from within said space, said withdrawing occurring without substantially changing the consistency of said pulp;
- and
- prior to withdrawing said pulp, homogenizing and densifying the high consistency pulp in a substantial portion of said space;
- said homogenizing comprising, at a location remote from said pumping means breaking up the pulp pieces included in the pulp without disintegrating said fibers to substantially eliminate said air pockets and to generate an even downward flow of pulp in said space towards said suction inlet and to prevent arching of the pulp inn front of the pump suction opening.
A method of facilitating the discharge of a high consistency cellulose fiber pulp having a consistency of from about 8% to about 25% from a high consistency pulp-containing space, which space constitutes one of a mass tower and a drop leg, and for treating said pulp in said space, said method comprising:
- introducing a high consistency pulp including non-homogeneous pieces of pulp having pockets filled with air therebetween into said space in a substantially vertical direction;
- withdrawing said pulp from said space in a direction transverse to said vertical direction of pulp introduction by using a pumping means with a suction opening connected transversely to said space for pumping said pulp from within said space, said suction opening being remotely spaced from any means for generating substantial fluidizing of the pulp, said withdrawing occurring without substantially changing the consistency of said pulp;
- and
- prior to withdrawing said pulp, homogenizing and densifying the high consistency pulp in the space;
- said homogenizing comprising, at a location remote from said pumping means, breaking up the pulp planks includes in the pulp to facilitate the flow of pulp in said space towards said suction inlet and to prevent arching of pulp in front of the pump suction opening.
A method of facilitating the discharge of a high consistency cellulose fiber pulp having a consistency of from 8% to about 25% from a high consistency pulp-containing space, which space constitutes one of a mass tower and a drop leg, said method comprising:
- introducing into the space a high consistency pulp including non-homogeneous pieces of pulp;
- and
- withdrawing said pulp from said space without substantially changing the consistency of said pulp;
- said withdrawing comprising pumping said pulp from within said space by a pump in such a manner as to homogenize the high consistency pulp that is so pumped;
- pressurizing the withdrawn pulp;
- and
- further homogenizing and densifying said pulp in said space by recirculating at least a portion of the pressurized, withdrawn pulp back into said pulp-containing space, so as to enhance the efficiency of said discharge.
Dependencies are inferred from the claim text.