B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
182/19
B01D 35/00 (2006.01) B01D 24/00 (2006.01)
Patent
CA 1073366
ABSTRACT OF THE DISCLOSURE A method and apparatus for controlling the operation of gravity or pressure filters in a filtration system. A bank of filter beds are provided for removing suspended solids from the fluid medium which are fed to the filters via a common inlet conduit. Each of the filters has an associated effluent conduit which, in turn, has a throttling device positioned therein controlling the rate of flow of the fluid medium through the respective filter. A differential pressure trans- mitter is provided for each filter bed to measure the differ- ential fluid pressure thereacross and to provide an output analog signal proportional thereto. A control device generates a control signal in response to the output from the differential pressure transmitter and a set point signal representing the desired differential pressure. The control signal is utilized to vary the throttling device in the effluent conduit and, consequently, to bring the measured differential pressure across the filter bed in line with the desired differential pressure. A common set point signal is provided for the entire bank of filters by means of a level or pressure sensor posi- tioned in the common inlet conduit. In this manner, each filter operates at a different flow rate but at the same differential pressure across the filter and responds to both varying influent flows and effluent flows so as to minimize the differential pressure loss thereacross.
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