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SUBMERGED PLASMA GENERATION DEVICE

外国特許コード F210010390
整理番号 (S2019-0560-N0)
掲載日 2021年5月6日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2020JP025987
国際公開番号 WO 2021039112
国際出願日 令和2年7月2日(2020.7.2)
国際公開日 令和3年3月4日(2021.3.4)
優先権データ
  • 特願2019-153276 (2019.8.23) JP
発明の名称 (英語) SUBMERGED PLASMA GENERATION DEVICE
発明の概要(英語) Provided is a submerged plasma generation device which can stably maintain a uniform and high concentration of plasma in a liquid, is easily capable of scaling up, and is applicable even to large-scale treatment water. The submerged plasma generation device sterilizes the treatment water by means of the plasma generated by applying a voltage between electrodes disposed in the treatment water and is provided with counter electrodes arranged in parallel and opposite to the same direction as the water flow direction of the treatment water.
従来技術、競合技術の概要(英語) BACKGROUND ART
Plasma sterilization, in which plasma is generated to sterilize an object, has diverse applications, and the field of application has continued to expand. Examples of such an application field include water purification treatment. In particular, a plasma generating apparatus capable of decomposing organic matter and the like contained in treated water to be sterilized by plasma is expected.
In conventional water purification treatment, chemical treatment such as hypochlorous acid has been performed. However, although chemical treatment is inexpensive, there is a problem of residual properties after the water purification treatment, and the effect on the health of the human body is regarded as a problem. In addition, the possibility of the generation of chemical-resistant microbes or microbes has also been suggested, and the bactericidal action thereof cannot be said to be permanent.
In this regard, if a plasma in liquid generator capable of plasma sterilization for treated water is realized, the treated water can be strongly sterilized by the sterilizing power of the OH radicals generated by the high reactivity of the plasma, and there is no residual property like chemicals. Therefore, in a case where the in-liquid plasma generator can be applied to the water purification treatment, the in-liquid plasma generator is non-toxic water purification treatment, and thus realization thereof is desired.
However, in order to realize an in-liquid plasma generator, there are essential technical problems. That is, it is difficult to generate plasma in the liquid. It is also not practical to apply a very high voltage to the electrode in the liquid. Therefore, development of a technique capable of easily and efficiently generating plasma in a liquid has been addressed in the related art.
For example, a conventional in-liquid plasma generating apparatus is one in which discharge plasma is generated by applying a high voltage across a counter electrode disposed facing each other in the vicinity of a subsequent stage of cavitation in which cavitation bubbles are generated, A device for purifying water is known in which a counter electrode is disposed along an inner surface of a water passing pipe inside a cavitation generating unit so as to form creepage electrical discharge on a surface of the pipe (Patent Document 1).
In addition, a conventional in-liquid plasma generating apparatus includes: a reactor provided with a water passing pipe line, a nozzle, and a high-pressure-side electrode and a ground-side electrode that form a discharge unit; and a high-voltage power supply connected to the high-pressure-side electrode and the ground-side electrode, wherein the apparatus is configured to supply water to be treated at a fixed pressure to generate microcavitation bubbles and form discharge plasma thereon, A treatment method for decomposing and synthesizing a treated substance such as an organic substance contained in water to be treated, the method comprising the steps of: inserting a high-pressure-side electrode and a ground-side electrode toward a center portion from opposite directions to each other; A configuration is known in which a tip portion of each electrode is disposed so as to protrude to the center portion of the cross-section of the line at a fixed interval in parallel with the tip portion of each electrode being disposed (Patent Document 2).
Furthermore, as a method for replacing the nozzle described above, a conventional plasma in-liquid generator is known in which a gas is supplied to the vicinity of an electrode to generate air bubbles (Patent Document 3 ~ 6).
In addition, a conventional in-liquid plasma generator is known that includes a flow path through which a liquid containing a gas flows, a pair of electrodes that are provided in the flow path and that cause electrical discharge in the liquid, and a turbulent flow generator that generates turbulent flow in the liquid between the pair of electrodes (Patent Document 7).
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • SAGA UNIVERSITY
  • 発明者(英語)
  • IHARA Satoshi
国際特許分類(IPC)
指定国 National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS IT JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN WS ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG
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