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A method of controlling the amount of a liquid shower flow introduced onto a slurry mat such as a pulp mat which is undergoing incomplete liquid separation on a vacuum filter drum. The flow rate of the liquid being discharged with the slurry mat is determined by a capacitance measurement which is ta

A method of controlling the amount of a liquid shower flow introduced onto a slurry mat such as a pulp mat which is undergoing incomplete liquid separation on a vacuum filter drum. The flow rate of the liquid being discharged with the slurry mat is determined by a capacitance measurement which is taken after the slurry mat has passed to a point on the filter means where liquid separation no longer occurs. The shower flow is controlled by a correlation of the flow rate of the liquid in the slurry mat with the rate of slurry mat transfer from the vacuum filter drum and the necessary liquid shower flow as expressed by a dilution factor. The present control system may be combined with secondary apparatus to measure the flow rate and thickness of the total slurry mat in order to determine by correlation the slurry mat consistency, the rate of solid material production from the slurry mat and the amount of air contained in the slurry mat.

대표청구항 ▼

A process for controlling the flow rate of a liquid shower for a desired dilution factor in a countercurrent pulp washing operation in which the shower is applied to a slurry mat consisting of a mixture of a liquid and a solid material which rotates on the surface of a rotary drum vacuum filter wher

A process for controlling the flow rate of a liquid shower for a desired dilution factor in a countercurrent pulp washing operation in which the shower is applied to a slurry mat consisting of a mixture of a liquid and a solid material which rotates on the surface of a rotary drum vacuum filter wherein the liquid content per unit area of the slurry mat is determined by directly measuring the dielectric properties of the slurry mat after it has passed over a vacuum break and before it is discharged from the vacuum filter and the flow rate of the liquid shower is controlled in relation to said measured liquid content per unit area of the slurry mat with the surface area and the rotational speed of the rotary drum vacuum filter and said dilution factor.