Impeller-type paper pulp sparger at bottom of upward flow bleaching tower

Abstract

The present invention discloses impeller-type paper pulp sparger at bottom of upward flow bleaching tower, including impeller, conic node, feed compartment, upper bearing, impeller shaft, lower bearing, coupling and variable frequency motor; the impeller shaft is connected with the variable frequency motor via the coupling, the impeller is composed of blades that is smooth and evasive, without edge angle and semi-propeller shaped; a plurality of blades monoque composes the smooth flat upper surface, of which the central position is connected with the conic node; lower surface of the impeller that composed of a plurality of blades is divided into a plurality of semi-propeller shaped stock flow admission channels, of which the outermost end is stock outlet; the impeller shaft is connected with the conic node; peak of the conic node shapes sphere and harmonious in the whole. The invention employs variable frequency motor to control impeller rotation, making the paper pulp centrifuge in channels of the impeller, catching energy when centrifugation out and give the feed solution driving force again; and the paper pulp is distributed more uniformly through the helical flow channels without phenomenon of channeling, refluxing and fluid separation.

Description

technical field [0001] The invention relates to a pulp distributor in pulping and papermaking, in particular to an impeller type pulp distributor at the bottom of an upflow bleaching tower. Background technique [0002] At present, my country's up-flow bleaching tower bottom distributors are mainly divided into two types: those with a pulp distributor at the bottom of the tower and those without a pulp distributor at the bottom of the tower. The tower bottom slurry distributor is used on the spherical head or the oval head. There is no slurry distributor at the bottom of the tower, and a conical head is used at the bottom of the tower. For bleaching towers with a diameter of less than 2.0m to 2.5m, in order to save the investment of the pulp distributor and reduce the operating cost, a bleaching tower without a pulp distributor is usually used. The semi-cone angle of the head cannot exceed 30°, otherwise the phenomenon of backflow and fluid separation in the head will be s...

AI Technical Summary

Problems solved by technology

However, domestic pulp distributors generally have the following disadvantages: (1) Since the pulp enters from a fixed location, the distribution area of ​​the pulp is very limited; (2) Since the pulp changes from one large pulp pipe to multiple Small pulp tube, the diameter of the tube is reduced more, which is easy to cause material plugging

(3) This fixed-site feeding method will produce channeling phenomenon

4) Due to gravity and other reasons, backflow and fluid separation may occur

This kind of pulp distributor at the bottom of the bleaching tower makes the pulp distribution more uniform and does not cause channeling, but the energy consumption is relatively large

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