Bleaching and dyeing; fluid treatment and chemical modification – Fluid treatment – Special forms and forming
Patent
1991-04-09
1992-07-14
Coe, Philip R.
Bleaching and dyeing; fluid treatment and chemical modification
Fluid treatment
Special forms and forming
68181R, D21D 502
Patent
active
051291193
ABSTRACT:
The efficiency of a diffuser, for washing or bleaching paper pulp, is enhanced by taking steps to ensure that the approximate upstroke speed is only slightly faster than the pulp upflow velocity, to provide an early warning indication of the tendency of the diffuser screens to plug, and to prevent upward movement of the screen, after completion of a downstroke, uncontrolled by the hydraulic system designed to effect movement. The pressure under the annular screen is sensed and compared to normal static pressure at the elevation of the screen by a D/P cell in a leg, and a computer controls the hydraulic system so that the screen upstroke speed is only slightly faster than the pulp upward speed. Early detection of a tendency to plug is provided by a pressure sensor within the hollow interior of the screen spaced from the screen orifices. To prevent gas from pushing the screen upwardly, during an initial part of an upstroke, the hydraulic system is operated to effect quick upward movement a small predetermined distance before continuous, smooth movement is effected.
REFERENCES:
patent: 3729961 (1973-05-01), Leffler
patent: 4908896 (1990-03-01), Jacobsen et al.
patent: 5020178 (1991-06-01), Jacobsen
Coe Philip R.
Glentech Inc.
LandOfFree
Diffuser efficiency does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Diffuser efficiency, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diffuser efficiency will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-327768