Abstract:
Ozone is generated from an oxygen-containing gas utilizing a tube-type ozone generator at significantly greater power efficiency. The oxygen is introduced into the annular passageway between the electrodes of the tube-type ozone generator at an angle (e.g. about 45-90 DEG ) so that it swirls in a cyclonic flow path as it travels from one end of the annular passageway to the other. The amount of power consumed to produce a gas having about 8 % ozone is roughly half of the power needed if the same conditions are applied but the oxygen gas is introduced conventionally (without swirling action, so that it travels along the dimension of elongation of the passageway). The swirling action also allows a higher concentration of ozone (e.g. 10 % or more) to be achieved in the product gas compared to the same conditions when no swirling is employed. Cooling fluid, such as nitrogen gas, may be passed through an interior passageway and outside the outer electrode either co-current or countercurrent to the general direction of oxygen gas flow.
Abstract:
Ozonizer (10) which supplies a feed gas to ozone generating cell (11) under application of a high voltage and which delivers an ozone gas through an ozone gas transport path (consisting of pipes (14) and (15)) as it has been generated in said ozone generating cell (11) is characterized in that the ozone gas transport path is furnished with means for removing at least one of NOx, HF and SOx (in the drawings, the means is for removing NOx) and that the ozone gas from the ozone generating cell (11) is passed through said removing means, whereby at least one of NOx, HF and SOx in said ozone gas is removed before it is delivered to a subsequent stage. The product ozone is not contaminated with Cr compounds at all or insufficiently contaminated to cause any practical problems in the fabrication of highly integrated semiconductor devices. Alternatively, ozonizer (10) which comprises an ozone generating cell (11) having an inlet (8) for supplying a feed gas, high voltage applying means (35) and an outlet (29) for discharging the ozone generated, and ozone delivery paths (30) and (31) for delivering the generated ozone is characterized in that oxygen (1) supplemented with 10 - 20 vol% of carbon dioxide and/or carbon monoxide (2) is used as the feed gas. The thus produced ozone is significantly low in the level of Cr compounds and, hence, can suitably be used in the formation of metal oxides, in particular, silicon oxide.
Abstract:
There is provided a highly efficient and compact ozone generating apparatus in which a very short air gap (5) of about 0.2 mm is formed at high accuracy. Non-discharge portions are dispersed and disposed to cover an entire discharge space, or a spacer (61) is provided to form the non-discharge portion. Further, an elastic body is mounted on a back face of an electrode, thereby enhancing an air gap accuracy of the discharge space.
Abstract:
PROBLEM TO BE SOLVED: To obtain a nitrogen suppression ozone generator which promotes an ozone production reaction by adding a micro amount of nitrogen gas. SOLUTION: A photocatalytic substance having a band gap of 2.0-3.6 eV is prepared in a dielectric or an electrode of a discharge region, and ozone gas is generated by applying an AC voltage from a power source and injecting discharge electric power to the discharge region, supplying oxygen gas to the discharge region together with nitrogen gas which is supplied to the oxygen gas for promoting an ozone production reaction in the range of 10-500 ppm, dissociating the oxygen gas which passes through the discharge region into oxygen atoms by the interaction between discharge light having a light wavelength of at least 344-620 nm which is emitted by an electric discharge and the photocatalytic substance, and bonding the oxygen gas with the dissociated oxygen atoms. COPYRIGHT: (C)2011,JPO&INPIT