Liquid purification or separation – With means to add treating material – Directly applied to separator
Patent
1975-07-11
1977-02-15
Hart, Charles N.
Liquid purification or separation
With means to add treating material
Directly applied to separator
210456, 239145, B01D 3306
Patent
active
040081540
ABSTRACT:
A wash liquid distributor for a rotary drum filter which distributes liquid uniformly across the filter cake and provides very effective washing. The distributor apparatus in its preferred embodiment comprises an elongated hollow pipe, one or more being used in parallel operation, each pipe having a multiplicity of evenly spaced and axially aligned small holes. Each hole imposes a substantial pressure drop on the fluid passing therethrough and creates a uniform distribution of the wash liquid along the distributor pipe. To avoid damage to the filter cake from the jets of liquid produced, a diffusion channel is provided which damps the kinetic energy of the jets and subdivides the liquid entering the channel. Upon leaving the diffusion channel the liquid is collected and redistributed from drip points spaced at intervals which are generally narrower than those of the holes in the distributor pipe. In the preferred embodiment such drip points are provided by helical overwrap of wire which serves both to collect liquid leaving the diffusion channel and to redistribute it onto the filter cake. The three-step procedure of the distributor creates a multiplicity of narrow pools of liquid on the filter cake which provide efficient washing when drawn through the cake by vacuum inside the drum and avoiding channeling through the cake or blinding of its passages.
REFERENCES:
patent: 3215277 (1965-11-01), Miles, Jr.
patent: 3302408 (1967-02-01), Schmid
patent: 3777987 (1973-12-01), Allport
Richards John F.
Tripp Robert G.
Exxon Research and Engineering Company
Hart Charles N.
Mukai R. G.
Paris F. Donald
Wells H. N.
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