US 4,995,991 A · Method and apparatus for improving the operation of a disc filter

Abstract

A disc filter and method of operating same is provided in which a liquid jet is intermittently used to detach pulp cake from the disc filter. In operation, mechanical or electrical means actuate a nozzle to spray pressurized fluid at a portion of the boundary between the surface of each disc filter segment and its associated pulp cake. The nozzle is actuated to begin spraying as respective segments move into register with the nozzle and are cause to discontinue spraying prior to moving out of register when the loosened pulp cake falls from the segments by gravity. the improved control of pulp cake removal reduces use of washing fluid and results in improved pulp cake consistency.

Claims15

Dependent claims

A method of detaching pulp cakes from the surface of a rotating disc filter that is divided into a plurality of segments which are sequentially immersed in a basin containing fiber suspension to pick up said fiber from said suspension to form pulp cakes on said segments, said method comprising:

directing a jet of pressurized fluid at a portion of the boundary between the filter surface and the pulp cake for dislodging said pulp cake from the filter for a time beginning when the leading edge of each of said pulp cakes registers with said jet and discontinuing said jet prior to each of said pulp cakes moving out of register with said jet and allowing the remainder of said pulp cake to fall from the filter by action of gravity.

Dependencies are inferred from the claim text.

Method and apparatus for improving the operation of a disc filter

Life of this patent

Method and apparatus for improving the operation of a disc filter

Life of this patent

Abstract

Claims15