| 摘要 |
A pair of strainer systems in parallel provide continuous filtration of solids from an influent stream. In influent strikes a filtration medium in the form of a porous membrane at an angle other than the perpendicular to create a washing action to remove filtrate from the surface of the porous membrane. As filtrate builds up on the surface of the porous membrane, the pressure differential across the strainer increases to a first setpoint which activates a motor which drives a wiper blade to scrub filtrate off the surface of the porous membrane. Ultimately, solids build up within the pores of the porous membrane to a point where the wiper blade is no longer effective to lower the differential pressure across the strainer to an acceptable level. When this happens, a differential pressure signal isolates the operations strainer and places the standby, parallel strainer in service. Filtrate scrubbed from the surface of the porous membrane is collected in a sump and occasionally drained or flushed from the system.
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