Showing papers by "Young I. Cho published in 1996"

Electronic scale reduction technique

Abstract: For producing controlled precipitation in fluid flowing through a pipe, a coil of electric wire, of flat, generally rectangular spiral shape, is sandwiched between flexible cover sheets. The resulting assembly is applied to the outer circumference of the pipe, with the lengthwise dimension of the coil extending perpendicularly to the flow inside the pipe. A time-varying electric current is applied to the coil to produce a corresponding magnetic field. This, in turn, causes induction which produces the controlled precipitation.

Electronic scale reduction by eccentrically positioned coils

Abstract: For producing controlled precipitation in fluid flowing through a pipe, a coil of electric wire is applied to the pipe segment in which this controlled precipitation is to be produced. This coil may be in the form of an induction coil wrapped around the pipe. Or the coil may be of a flat, rectangular spiral form. In any case, the coil is applied in such a way that the center of its curvature does not coincide with the pipe axis. Instead, this center of coil curvature is offset from the pipe axis. Preferably, this offset is approximately equal to the radius of the pipe.

Corrosion free electronic descaling technology

Abstract: A method for minimizing localized corrosion of fluid containers that occurs as a consequence of most non-chemical procedures for removing scale deposits is described. It counteracts the unavoidable side-effect of the lowering of the local pH in the vicinity of the bubbles of CO2 that are generated during an electromagnetically-induced controlled precipitation procedure (17). The method is a simple and facile procedure for curbing the localized corrosion occurring as a result of most nonchemical procedures for removing scales. The method is desirably performed by an induction coil (20) wrapped around a fluid container such as a pipe encrusted with scale through which hard water is flowing (18). A pulsing electrical current (22A) is successively applied, a transitory induced electric current is generated in the solution, and scale encrusted on the fluid container dissolves in the solution. When the pulsing is stopped, the induced electric current in the solution ceases and so the scale stops dissolving, allowing a protective layer of scale to form over potential points of corrosion. Optionally permanent magnets may be used in the process, alone or with an induction coil.

Improved current driver for electronic descaling

Abstract: An electronic descaling system to prevent or remove mineral deposits by exposing moving fluids to magnetic and electric fields includes an improved power supply. In particular, the power supply adapts to the varying length, diameter and impedance of attached coil (20) and cable combinations, and still provides the proper current and power levels to effectuate electronic descaling. A constant current D.C. power supply (10) having a regulated D.C. current output level is provided. The substantially constant D.C. current output is then switched in a switching circuit (12) responsive to a switching control signal to provide a bi-directional current through the coil (20) in one direction and then switched to conduct current through the coil (20) in the other direction. The switching frequency of the switching control signal is time variable or constant. The present improved current driver adapts for such varying frequencies while providing a substantially constant D.C. current output level as the frequency of switching control signal varies. The descaling coil (20) provides the proper induced electric and magnetic fields, and the resulting induced electromotive force, for different switching frequencies and for cables with varying lengths and coils with varying diameters.