B - Operations – Transporting – 03 – C
Patent
B - Operations, Transporting
03
C
317/3
B03C 9/00 (2006.01) B01D 17/06 (2006.01) C10G 33/02 (2006.01)
Patent
CA 1207018
VOLTAGE CONTROL SYSTEM FOR ELECTROSTATIC OIL TREATER Abstract of the Invention An automatic voltage control system controls the firing angle of a solid state switch (20), in turn the voltage applied to the primary winding (12) of a step-up transformer (10), in turn the voltage applied to the grid (38) and in turn the electric field intensity between grid elements (38) in an electrostatic separation process. Two voltage control signals are generated in the control system. The first voltage control signal is a protective control signal generated to maximize the voltage applied to the primary winding under normal operating conditions and to reduce the voltage to zero for a short time period following abnormal operating conditions then to reapply voltage to the primary winding (12) again. The second voltage control signal is a periodic signal of adjustable rate and frequency that functions as a variable upper limit to the magnitude of the first control signal. The first control signal as limited in magnitude by the second control signal controls the firing angle of a solid state switch (20), in turn the voltage applied to primary winding (12) and in turn the electric field intensity between grid elements (38). The electric field intensity increase then decreases periodically to coalesce small droplets of a first fluid dispersed throughout a second fluid into larger droplets. During the increase in electric field intensity, small droplets of the first fluid are coalesced into larger droplets. The decrease in electric field intensity encourages continued coalescence of larger droplets. Any droplets not coalesced during a given cycle of field intensity are subjected to subsequent periodic variations in field intensity as the electrostatic separation process through flow is continuous and the electrostatic field intensity variation is repetitive.
430931
Prestridge Floyd L.
Schuetz Adolph A.
Wheeler Harry L.
Combustion Engineering Inc.
Smart & Biggar
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