Solid material comminution or disintegration – Processes – With application of fluid or lubricant material
Patent
1988-06-20
1989-07-18
Eley, Timothy V.
Solid material comminution or disintegration
Processes
With application of fluid or lubricant material
241 20, 241 21, B02C 1300
Patent
active
048486744
ABSTRACT:
Paper making pulp stock being processed in a pulper is caused to flow through an auxiliary passageway from the main body of the pulper tub and back to the pulper tub at the downstream end of the passageway, propelled solely by the fluid dynamics of the vortical circulation in the pulper. The stock is first caused to flow through a diverging section of the passageway, whereby its velocity along the passageway is caused to decelerate, thence to a section of relatively large cross-section, where the velocity of the stock is low, and gravity classification takes place, and thence to a converging section of the passageway where its velocity is caused to accelerate before re-entering the main pulper tub. In its progress through the auxiliary passageway the fluid energy of the moving pulp stock is converted from largely velocity energy to largely pressure energy, or head, in the diverging section and then from largely pressure energy to largely velocity energy in the converging section of the passageway, according to the well-known Bernouilli equation in fluid mechanics. In the section of large cross-section, the heavy contaminants settle to the bottom, and the light weight contaminants rise to the top. The heavy and light weight contaminants are separately removed. The method may be performed efficiently, both in pulpers having a rotor mounted on a vertical shaft, and in pulpers having a rotor mounted on a horizontal shaft.
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