| 摘要 |
<p>The screens (114) of a pulp treating vessel (110), such as a paper pulp thickener, or diffuser, are back flushed in a simple yet effective manner. The screens are mounted to a supporting conduit (116) within a vertical vessel, and a cylinder (42) is connected at one open end (43) to the conduit, and the other open end (44) is disposed within the pulp inside the vessel. A piston (46) is mounted within the cylinder and relative movement between the piston and cylinder is effected periodically in order to force liquid from within the cylinder into the conduit and out the screens, backflushing the screens and preventing clogging. Since no additional volume of liquid is added to the vessel during backflushing, no surge occurs in the vessel. Conventional accumulators, on/off valves, and the like can be eliminated while -- in the case of diffusion washing -- efficiency can be increased as much as 20-30%, and capacity increased as much as about 15%.</p> |
