Cleaning and liquid contact with solids – Apparatus – Automatic controls
Patent
1986-10-20
1988-08-02
Coe, Philip R.
Cleaning and liquid contact with solids
Apparatus
Automatic controls
222190, 73302, 366153, B08B 304
Patent
active
047608560
ABSTRACT:
A method and apparatus for conditioning fly ash discharged from a silo to prevent the material from excessively dusting during discharge and transit to a storage or dump site. Apparatus includes a level box flow connected to the outlet of the silo with a modulating valve positioned between the outlet of the silo and the inlet of the level box for controlling the flow rate of material into the level box. The level box is a gas permeable bottom with air under pressure being passed upwardly through the material therein to aerate the material and improve flow characteristics of the material into an ash conditioner which is flow connected to the outlet of the level box. The ash conditioner is a conventional type including a rotating drum with an internal spray system for spraying water onto the ash to wet the ash. Wetted fly ash is relatively dust free when discharged from the conditioner. A bubble tube level sensor in the ash conditioner is used to control the valve controlling feed rate of material from the silo into the level box to maintain a substantially constant level of material in the level box and thus to the ash conditioner. The bubble tube is also used to control the quantity of water sprayed onto the material in the ash conditioner to avoid under or over wetting of the material. The method disclosed includes controlling the quantity of liquid applied to the fly ash as a function of the flow rate of material from the silo into the conditioner.
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Coe Philip R.
Fuller Company
Stinson Frankie L.
Thomson Frank H.
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