Abstract:
Apparatus for treating a fluid having an ioniser (1) with one or more outlets connected to a chamber (7) having one or more inlets and one or more outlets. The chamber has a maximum cross-section transverse to a direction of flow between the/or each inlet and the/or each outlet and the cross-section of the/or each outlet is smaller than the maximum cross-section. A gas flow means is arranged, in use, to cause a gas to flow via the ioniser and the chamber and combine ionised gas with a fluid to be treated thereby to introduce hydroxyl radicals into the fluid, and so treat the fluid. Fluids, especially liquids containing water, are treated by the introduction of hydroxyl radicals generated by ionising a gas, especially air. The ioniser may be a dielectric barrier discharge device having a tubular dielectric (14) surrounding an electrode (15) and, in turn, surrounded by an electrically conductive sleeve (16), the ends of which may be flared, rounded or turned back. Air may be caused to flow through the device by a pump, blower or venturi device (9).
Abstract:
A nozzle for a plasma generator. The nozzle comprises a body (1) defining a plasma generating chamber (25) having a gas inlet (12) at one end and plasma outlet (10) at the opposite end defining a flow direction from the inlet to the outlet. An inner electrode (20) is positioned around an inner wall of the body. An outer earthed electrode (22) is provided around an outer wall of the body. The inner (20) and outer (22) electrodes overlap one another in the flow direction.
Abstract:
액체 플라즈마 토치 발생장치가 개시된다. 본 발명의 실시예에 따른 액체 플라즈마 토치 발생장치는 제1전극; 제2전극; 상기 제1전극과 상기 제2전극 사이에 위치하는 제1유전체; 및 상기 제1전극, 상기 제2전극 및 상기 제1유전체를 관통하는 유로를 포함하고, 상기 제1전극과 상기 제2전극에 전압이 인가되는 경우 상기 유로를 통과하는 전도성 액체를 기초로하여 플라즈마를 발생시킨다.
Abstract:
Plasma processing of powder particles is performed by supplying a first gas stream, containing particle material to be processed, and a second gas stream comprising a plasma carrier gas. The first gas stream is supplied from an inlet pipe into a dielectric pipe. The dielectric pipe coaxially surrounds the inlet pipe, and extends beyond a downstream end of the inlet pipe. The second gas stream is supplied into a space between the inlet pipe and the dielectric pipe and from there into the dielectric pipe beyond a downstream end of the inlet pipe. A surface dielectric barrier plasma discharge is generated along the inner surface of the dielectric pipe at least on a part of the dielectric pipe upstream of the downstream end of the inlet pipe.
Abstract:
Die Erfindung betrifft eine Vorrichtung zur Erzeugung eines Plasma-Jets mit mindestens einem Entladungsrohr, durch das ein Prozessgas hindurchströmt. Erfindungsgemäß ist an mindestens einem Entladungsrohr ein elektrisch leitender Entladungsschutz vorgesehen. Die Vorteile der Erfindung bestehen insbesondere darin, dass parasitäre Entladungen unterdrückt werden und die thermischen Belastungen der einzelnen Bauteile der Vorrichtung und des Substrates reduziert werden.
Abstract:
The present invention relates to a method and a device for manufacturing optical preforms, in which one or more layers of glass, doped or undoped, are deposited onto the internal surface of a hollow substrate tube, which deposition is effected by supplying one or more reactive gas mixtures of glass-forming compounds tot the interior of the hollow substrate tube and subsequently generating a non-isothermal plasma in the hollow substrate tube, after which the preform is subjected to a contraction process for the purpose of forming a massive rod, from which optical fibres are drawn.
Abstract:
A sterilization and decontamination system in which a non-thermal plasma discharge device is disposed upstream of a suspension media (e.g., a filter, electrostatic precipitator, carbon bed). The plasma discharge device generates a plasma that is emitted through apertures (e.g., capillaries or slits) in the primary dielectric. Plasma generated active sterilizing species when exposed to contaminants or undesirable particulate matter is able to deactivate or reduce such matter in contaminated fluid stream and/or on objects. Thus, the undesirable contaminants in the fluid to be treated are first reduced during their exposure to the plasma generated active sterilizing species in the plasma region of the discharge device. Furthermore, the plasma generated active sterilizing species are carried downstream to suspension media and upon contact therewith deactivate the contaminants collected on the suspension media itself. Advantageously, the suspension media may be cleansed in situ. To increase the sterilization efficicency an additive, free or carrier gas (e.g., alcohol, water, dry air) may be injected into the apertures defined in the primary dielectric. These additives increase the concentration of plasma generated active sterilizing agents while reducing the byproduct of generated undesirable ozone pollutants. Downstream of the filter the fluid stream may be further treated by being exposed to a catalyst media or additional suspension media to further reduce the amount of undesirable particulate matter.
Abstract:
A plasma reactor (100) including a first dielectric (115) having at least one capillary (146) defined therethrough, and a segmented electrode (140) including a plurality of electrode segments (140), each electrode segment (140) is disposed proximate an associated capillary (146). The reactor (100) may include a second electrode (120) and dielectric with the first and second dielectrics (115) separated by a predetermined distance to form a channel (125) therebetween into which the plasma exiting from the capillaries (146) in the first dielectric (115) is discharged. The fluid to be treated is passed through the channel (125) and exposed to the plasma discharge. The fluid to be treated may be exposed to the plasma discharge both in the capillaries (146) as well as in the channel (125) between the two dielectrics (115). The plasma reactor (100) has a wide range of application, such as the destruction of pollutants in a fluid, the generation of ozone, the pretreatment of air for modifying or improving combustion, and the destruction of various organic compounds, and surface cleaning of objects.
Abstract:
Tracer gas sensing device comprising a gas discharge cell (12) having cell walls (14) defining a discharge volume (30) and a tracer gas inlet (16) into the discharge volume (30), an optical spectrometer arrangement having a radiation source (26) on a first side of the discharge cell for emitting radiation into the discharge cell and a radiation detector (28) on a second side of the discharge cell opposite to the first side for detecting radiation which was emitted by the radiation source (26) through the discharge volume (30), and electrodes (32) on opposing sides of the discharge cell for generating a plasma within the discharge cell, said electrodes (32) being unexposed plasma electrodes (32). The discharge cell may be a dielectric barrier discharge cell and the electrodes may be powered by an AC power source. Furthermore, at least one magnet may be positioned behind each electrode to minimize losses of plasma electrons on the discharge cell walls. Either tracer or buffer gas may be helium, hydrogen, oxygen, neon, nitrogen or combinations thereof.