US 12,668,920 B2Granted

Accept tank mixing arrangement

AssigneeAndritz Inc.

InventorKimmo Vanhala

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Abstract

An accept tank arrangement for mixing of pulped fiber suspension including sidewalls (3,4) including opposite arched ends (2) and an elongated section (1) between the arched ends (2). The accept tank has mixers (10) each located within one of the arched ends (2). The mixers (10) have axles (11) on which are mounted propellers (12). The mixers (10) are aligned horizontally and each axle points to a respective point on the elongated section (1) of the sidewall (3) which away from an end of the elongate section by at least 25% of the length of the elongated section (1). The propellers (12) are symmetrically positioned with respect to a center-point of the accept tank. Within the center of the elongated section is an elongated centerpiece (6) having rounded ends. The accept tank has a substantially flat bottom at least at the elongated section (1) of the accept tank.

Claims20

Dependent claims

An accept tank arrangement for mixing of pulped fiber suspension, the accept tank arrangement comprising:

an accept tank configured to receive the pulped fiber suspension and the accept tank comprises sidewalls including a first elongated sidewall and a second elongated sidewall on an opposite side of the accept tank from the first elongated sidewall, and a first arched sidewall end and a second arched sidewall end;
an accept outlet in one of the first and second elongated sidewalls, wherein the accept outlet is configured to discharge accepts from the pulped fiber suspension,
a first mixer configured to mix the pulped fiber suspension in the accept tank and the first mixer including a first axle driving a first propeller in a region within the tank boarded by the first arched sidewall end, wherein a first axis of the first axle projects through a first point on the first elongated sidewall no less than twenty-five percent (25%) of a length of the first elongated sidewall away from the first arched sidewall end,
a second mixer configured to mix the pulped fiber suspension in the accept tank and the first mixer including a second axle driving a second propeller in a region within the tank boarded by the second arched sidewall end, wherein a second axis of the second axle projects through a second point on the second elongated sidewall no less than twenty-five percent (25%) of a length of the second elongated sidewall away from the second arched sidewall end, and
a reject outlet configured to discharge rejects from the pulped fiber suspension from the accept tank and the reject outlet is proximate a bottom of the accept tank,
wherein the first arched sidewall end is joined to first ends of each of the first and second elongated sidewalls,
wherein the second arched sidewall end is jointed to second ends of each of the first and second elongate sidewalls, and the second ends are opposite to the first ends, and
wherein the first and second arched sidewall ends each have a curvature greater than any curvature of the first and second elongated sidewalls.

5 more elements

An accept tank assembly for mixing of pulped fiber suspension, the accept tank comprising:

an accept tank with a bottom, wherein the accept tank is configured to receive the pulped fiber suspension;
sidewalls of the accept tank extending around a periphery of the bottom, the sidewalls including a first elongated sidewall, a second elongated sidewall opposite to the first elongated sidewall, a first arched sidewall end at first ends of the first and second elongated sidewalls and a second arched sidewall end at second ends of the first elongated sidewall and the second elongated sidewall,
an accept outlet for the accept tank, wherein the accept outlet is configured to discharge accepts from the pulped fiber suspension in the accept tank;
a first mixer configured to mix the pulped fiber suspension in the accept tank and the first mixer includes a first axle driving a first propeller boarded by the first arched sidewall end, wherein a first axis of the first axle projects through a first point on the first elongated sidewall at least twenty-five percent (25%) of a total length of the first elongated sidewall away from the first arched sidewall end, and
a second mixer configured to mix the pulped fiber suspension in the accept tank and the first mixer includes a second axle driving a second propeller in a region within the tank boarded by the second arched sidewall end, wherein a second axis of the second axle projects through a second point on the second elongated sidewall at least twenty-five percent (25%) of a total length of the second elongated sidewall away from the second arched sidewall end, and
a reject outlet configured to discharge rejects from the pulped fiber suspension in the accept tank, wherein the reject outlet is at least partially in an end section of the bottom
wherein the first and second arched sidewall ends each have a curvature greater than any curvature of the first and second elongated sidewalls.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/563,701Filed 20 May 2022
Priority: FI 2021561525 May 2021
Published: US 2024/0229352 A111 Jul 2024
Granted: 30 Jun 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

D21B 1/342
Kneading or mixing; Pulpers: mixing apparatus
B01F 27/71
With stirrers rotating about a horizontal or inclined axis: with propellers
B01F 35/50
Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application: mixing receptacles
D21B 1/34
Defibrating by other means: kneading or mixing; Pulpers