Control of pressurized ozone flow to a pulp delignification...

Details Control of pressurized ozone flow to a pulp delignification... Control of pressurized ozone flow to a pulp delignification...

D - Textiles, Paper

21

C

D21C 3/02 (2006.01) D21C 9/10 (2006.01) D21C 9/153 (2006.01)

Patent

CA 2149404

2149404 9413393 PCTABS00032 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.

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