Liquid purification or separation – Electrical insulating or electricity discharging
Patent
1998-07-17
2000-03-07
Simmons, David A.
Liquid purification or separation
Electrical insulating or electricity discharging
422186, 42218604, 96 24, 96 82, 361225, B03C 368, B60H 306
Patent
active
060335653
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a system for treating gases or liquids by means of corona discharge, comprising:
a) a corona discharge space through which the gases or fluids to be treated are guided,
b) a corona wire inside the corona discharge space,
c) a source for generating a high voltage, the output of said source being connected to the corona wire,
d) control electronics for controlling the operation of the high voltage generating source based on at least one parameter related to the corona discharge space.
BACKGROUND OF THE INVENTION
A system of this type is known from U.S. Pat. No. 4,779,182. In this prior art system the corona discharge space is used to scrub a waste gas of foreign matter. The high voltage generating source supplies a high DC voltage to the corona wire inside the corona discharge space. The control electronics for controlling the operation of the high voltage generating source receives a signal from a measuring circuit measuring the high voltage supplied to the corona wire and receives furthermore signals indicating the amount of foreign matter in the gas to be treated at the input of the corona discharge space and at the output of the corona discharge space.
If this type of system has to be used on an industrial scale in general a high processing capacity is desirable. To obtain a high processing capacity in general a large electrical power has to be dissipated inside the corona discharge space. To restrict the current supplied to the corona wire the only way to increase the dissipated power is to increase the voltage level of the high voltage generating source. Very high voltages and still restricted power levels can only be obtained if, instead of a DC voltage, voltage pulses are supplied. The use of voltage pulses for powering a corona discharge space is known as such, see for instance U.S. Pat. No. 4,919,690 and U.S. Pat. No. 4,695,358.
A significant disadvantage of the use of high voltage pulses is the disturbing effect thereof.
SUMMARY OF THE INVENTION
A first object of the invention is now to provide proper shielding measures which will allow the use of high voltage pulses instead of DC because they effectively inhibit the transmission of very broad spectra of disturbing energy.
In agreement with said object the system as defined in the first paragraph is characterized in that the high voltage generating source generates high voltage pulses, and that the system comprises furthermore
e) an electromagnetically compatible case formed by one or more housings of electrically good conducting material, each completely closed or closed to a large extent, whereby enclosures, enclosures, whereby the enclosures are mutually connected in a well conducting manner and whereby signal conduits, high voltage conduits and supply conduits extending between the mutual enclosure as well as between said enclosures and the outside world comprise at least two parallel conductors, of which at least one conductor at the in/output in/out an enclosure is connected electrically conducting to the wall of said enclosure and surrounds thereby the other conductor completely.
It is remarked that electromagnetic shielding is of course known as such. An example thereof in combination with a high voltage source for supplying a high DC voltage to a corona discharge space is described in GB-2265557. However, the shielding in this prior art system does not fulfil the requirements as indicated above by the invention, and is certainly unsuited if a pulsating voltage would be fed to the corona discharge space.
Although as such sensors for measuring a parameter related to the corona discharge space are known from for instance U.S. Pat. No. 4,779,182 in the form of gas contents measurement probes, in many industrial applications it is preferred not to control the high voltage generating source on the basis of the parameters of the gases or liquids to be treated, but to control the high voltage generating source on the basis of the electrical parameters of the discharge phenomena inside the cor
REFERENCES:
patent: 4592763 (1986-06-01), Dietz et al.
patent: 4695358 (1987-09-01), Mizuno et al.
patent: 4779182 (1988-10-01), Mickal et al.
patent: 4909812 (1990-03-01), Shapenko et al.
patent: 4919690 (1990-04-01), Lovelock
patent: 5053914 (1991-10-01), Wessel et al.
patent: 5644079 (1997-07-01), Rilling et al.
Lemmens Robertus Hendricus Petrus
Smulders Hendriekus Wilhelmus Maria
Van Der Laan Pieter Cornelis Tobias
Van Heesch Egbertus Johannes Maria
Lawrence Frank M.
Simmons David A.
Stichting voor de Technische Weteschappen
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