Controlling the supply of bodyfeed to a filter
AssigneeCarlton and United Breweries Limited
InventorsMichael A. Pecar, Michael J. Lees, Duncan A. Campbell
Life of this patent
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Abstract
The invention features a control system for controlling the supply of bodyfeed to a filter for removing solids from a beer stream is described. By applying the bodyfeed at an appropriate rate and hence achieving appropriate effective bed voidage it is possible to maintain beer clarity while minimizing filter aid usage. The control system includes a means for determining turbidity of the liquid stream upstream of the filter, a means for determining the rate of pressure drop change across the filter, and a controller for altering the supply of bodyfeed to the filter in accordance with a calculated dose change.
Claims16
A control system for controlling the supply of bodyfeed to a filter for removing solids from a liquid stream, including:
- turbidity determining means for determining turbidity of the liquid stream upstream of the filter;
- pressure drop change determining means for determining the rate of pressure drop change across the filter and trend of pressure drop change rate;
- and
- a controller having dose change calculation means for calculating one of an unchanged dose, a small dose change, and a dose change from a determined turbidity and a determined rate of pressure drop change, and trend of pressure drop change rate and altering means for altering the supply of bodyfeed to the filter in accordance with a calculated dose change.
A method for controlling supply of bodyfeed to a filter for removing solids from a liquid stream, including:
- determining turbidity of the liquid stream upstream of the filter;
- determining the rate of pressure drop change across the filter and trend of pressure drop change rate;
- and
- calculating one of an unchanged dose, a small dose change, and a large dose change from the determined turbidity and the determined rate of pressure drop change, and trend of pressure drop change rate and altering the supply of body feed to the filter in accordance with the calculated dose change.
Dependencies are inferred from the claim text.