Paper making and fiber liberation – Apparatus – Digester
Patent
1992-12-07
1994-11-15
Alvo, Steve
Paper making and fiber liberation
Apparatus
Digester
162 49, 162 62, 162 65, 162263, 42218614, D21C 712, D21C 9153
Patent
active
053645057
ABSTRACT:
A method and apparatus supply ozone containing gas under superatmospheric pressure to an ozone delignification device. The speed of a water ring compressor is controlled so that it compresses as much ozone gas per unit time at desired superatmospheric pressure as the ozone delignification unit utilizes, with essentially no excess. The ozone containing gas is fed from the water ring compressor through a separator buffer tank which levels out pressure pulses and separates cooling water from compressed ozone gas prior to the gas entering the ozone delignification unit. The gas passes through a control valve controlled by a mass flowmeter which senses the amount of cellulose pulp fed to the ozone delignification unit. The speed control of the compressor may be provided by a differential pressure controller connected across the control valve.
REFERENCES:
patent: 3549528 (1970-12-01), Armstrong
patent: 4255257 (1981-03-01), Greiner et al.
patent: 4279694 (1981-07-01), Fritvold et al.
patent: 4902381 (1990-02-01), Meredith
patent: 4978508 (1990-12-01), Hansen et al.
patent: 5133946 (1992-07-01), Schwarlz
Dunn Stephen J.
Funk Erwin D.
Henricson Kaj
Alvo Steve
Kamyr Inc.
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