D - Textiles – Paper – 21 – D
Patent
D - Textiles, Paper
21
D
92/34
D21D 5/00 (2006.01) B01F 3/12 (2006.01) B01F 7/00 (2006.01) B01F 15/00 (2006.01) D21C 9/00 (2006.01)
Patent
CA 1313325
ABSTRACT The present invention relates to a method and an apparatus for optimizing the control and treatment of fibre suspension flow. The invention is mainly intended to be applied in connection with pumping of high- consistency pulp in pulp and paper industry. There are several earlier known means for controlling the function of the so called MC-pumps. The most usual is either a so called level control in which the level of the pulp container is controlled by throttling the flow leaving the pump to maintain at the desired level, or a constant-flow control, whereby the flow leaving the pump is maintained constant. In both cases the pressure loss in the valve grows high because the pulp proceeding as a plug flow frequently has to be pressed through the throttle opening of the valve. Additionally, there has been a risk that the valve will clog completely, especially with small flow amounts. The said problems are eliminated or minimized by the apparatus (19) according to the invention, in which in close proximity to the flow side surface of the valveelement (19) a fluidizing element (22) is arranged, which fluidizes the pulp to a liquid state so that the pulp can flow through the valve opening (16) and not clog it.
559428
Andritz-Ahlstrom Oy
Gowling Lafleur Henderson Llp
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