Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1974-08-28
1977-02-08
Nozick, Bernard
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34168, 55 96, 55 98, 55282, 55479, F26B 300
Patent
active
040065332
ABSTRACT:
There is provided a puffback technique for cleaning a panel bed contactor suitable for chemical or physical treatment of gas and granular material. Free surfaces for entry of gas are supported cooperatively by louvers. A puffback technique is provided for cleaning the gas entry surfaces to rid them of granular material "spent" by the treatment, including accumulated dust if the treatment includes filtration to remove dust from a gas. The puffback consists of a reverse transient flow across the panel bed of an intensity moderated so that the reverse pressure differential exceeds a first critical minimum for a time interval between about 5 and 150 milliseconds (preferably less than 50 milliseconds if the treatment includes filtration) and achieves a top value beyond a second critical minimum. After the panel bed is first filled with a granular gas-treating material, the bed is preferably loosened before treating operations begin, and the loosening can be accomplished by discharging a controlled quantity of material from the bottom of the bed.
REFERENCES:
patent: 3296775 (1967-01-01), Squires
patent: 3410055 (1968-11-01), Zenz
patent: 3912466 (1975-10-01), Zenz
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