JP2002228615A - Leak detection sensor for hydrogen gas - Google Patents
Leak detection sensor for hydrogen gasInfo
- Publication number
- JP2002228615A JP2002228615A JP2001027994A JP2001027994A JP2002228615A JP 2002228615 A JP2002228615 A JP 2002228615A JP 2001027994 A JP2001027994 A JP 2001027994A JP 2001027994 A JP2001027994 A JP 2001027994A JP 2002228615 A JP2002228615 A JP 2002228615A
- Authority
- JP
- Japan
- Prior art keywords
- platinum
- hydrogen gas
- detection sensor
- hydrogen
- phosphorus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】化石燃料の枯渇に備え、水素燃料
自動車又電池等水素の利用が増す趨勢にあり高温度での
水素雰囲気での使用可能な水素ガス漏洩検知のセンサに
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor for detecting a leak of hydrogen gas which can be used in a hydrogen atmosphere at a high temperature due to an increasing use of hydrogen such as a hydrogen fueled vehicle or a battery in preparation for the depletion of fossil fuels.
【０００２】[0002]
【従来の技術】従来、水素ガスはイオン化してその濃度
を検知する方法はガス・クロマトグラフの検出部又は水
素イオン濃度計等に見られ、他にも拡散膜を透過した水
素ガスを真空チャンバに導いて圧力の変動又は質量分析
する方法等があるが何れも構造が複雑であり、しかも高
温度での使用に耐えるものは無かった。2. Description of the Related Art Conventionally, a method of ionizing hydrogen gas and detecting its concentration can be found in a detecting portion of a gas chromatograph or a hydrogen ion concentration meter. There is a method of conducting pressure fluctuation or mass spectrometry, but none of them has a complicated structure, and none of them can withstand use at a high temperature.
【０００３】[0003]
【発明が解決しようとする課題】水素ガス漏洩検知セン
サとしては構造が簡単であり得ることは小型、軽量にす
ることで自動車への搭載も可能にする又水の電気分解の
逆の作用を利用した燃料電池殊に溶融炭酸塩型及び固体
電解質型の燃料電池にあっては高温度での水素の検出が
求められる。The structure of the hydrogen gas leak detection sensor can be simple. The sensor is small and lightweight, so that it can be mounted on an automobile, and utilizes the reverse effect of water electrolysis. In such fuel cells, particularly in molten carbonate type and solid electrolyte type fuel cells, detection of hydrogen at a high temperature is required.
【０００４】従来、構造が簡単でしかも高温度での使用
に耐える水素ガス漏洩検知センサが無かったので本発明
に於いてはこれらの課題を解決した水素ガス漏洩センサ
を提供するものである。Conventionally, there has been no hydrogen gas leak detection sensor which has a simple structure and can withstand use at a high temperature. Therefore, the present invention provides a hydrogen gas leak sensor which solves these problems.
【０００５】[0005]
【課題を解決するための手段】白金を燐の溶融温度以上
の蒸気と水素ガスと共存させると白金の表面から迅速に
侵食が生じることに着目し、白金が表面から侵食され次
第に内部に及び多孔質となり断面積が細る。Attention was paid to the fact that when platinum coexists with steam and hydrogen gas at a temperature higher than the melting temperature of phosphorus, erosion occurs rapidly from the surface of platinum. Quality and narrow cross-sectional area.
【０００６】導線とする金属の電気抵抗値は該金属線の
断面積に反比例し、長さに比例することから蒸気の如き
高温度で燐及び水素ガスと共存する環境に於いて白金の
断面積が小さくなって電気抵抗値が増すのが認められ
た。The electrical resistance of a metal used as a conductive wire is inversely proportional to the cross-sectional area of the metal wire and proportional to the length thereof. And the electrical resistance increased.
【０００７】ここで、電気抵抗値の迅速な変化は白金線
の比表面積を大きくして侵食の割合を大きくするため出
来るだけ細い線径の白金線を使用することで達せらる、
一つには白金が極めて高価であることもある。Here, a rapid change in the electric resistance value can be achieved by using a platinum wire having a wire diameter as small as possible in order to increase the specific surface area of the platinum wire and increase the erosion rate.
For one thing, platinum can be extremely expensive.
【０００８】さらに上述のように電気抵抗値が長さに比
例するものであるから電気抵抗値が抵抗計で把握出来る
程度の長さを要する。Further, since the electric resistance is proportional to the length as described above, the electric resistance needs to be long enough to be grasped by an ohmmeter.
【０００９】以上の如く本発明に於いては白金線が水素
ガスと燐の蒸気が共存する雰囲気で白金線が侵食されて
断面積が減ずることで電気抵抗値が増す、この電気抵抗
値の変化を知ることで水素ガスの漏洩、漏出を検知する
方法及び装置を提供するものである。As described above, in the present invention, the platinum wire is eroded in an atmosphere in which hydrogen gas and phosphorus vapor coexist and the cross-sectional area is reduced, thereby increasing the electric resistance. And a method and an apparatus for detecting leakage and leakage of hydrogen gas by knowing the same.
【００１０】[0010]
【発明の実施の態様】本発明に於いては、上述の電気抵
抗値の変化を敏感に捕捉するようにφ１０μｍ〜２５μ
ｍの極めて細い白金線をφ２．０〜６．０ｍｍのアルミ
ナを焼結して成形した巻枠に等間隔に捲き着けるか、該
巻枠上に白金を真空蒸着して薄膜を形成した帯状の抵抗
体に微小な電流を通じて抵抗値の変化を検出して、水素
ガスの漏出、漏洩を検知する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a diameter of 10 .mu.m to 25 .mu.
A very thin platinum wire having a diameter of 2.0 m is wound around a winding frame formed by sintering alumina having a diameter of 2.0 to 6.0 mm, or a strip-shaped thin film is formed by vacuum-depositing platinum on the winding frame. A leak of hydrogen gas is detected by detecting a change in resistance value through a minute current through the resistor.
【００１１】以上の如き構造を以ってすれば３００℃以
上の高温の雰囲気でも使用を可能にする水素検知センサ
を提供することが出来る。With the above structure, it is possible to provide a hydrogen detection sensor that can be used even in a high-temperature atmosphere of 300 ° C. or more.
【００１２】本発明の特徴の一つである水素ガスの検知
を敏感に検出するために、白金線の水素ガスによる侵食
を促すものとして燐との共存させる方法として、φ３．
２〜６．４ｍｍ程度の肉厚の薄い耐熱、耐食性を有する
金属管中に該検知センサを収容することとし、白金の細
線を巻回した検知部又は白金薄膜の検知部と前記収容の
鞘とする金属管との間の空隙に燐粉末を混じたセメント
を充填する。In order to detect hydrogen gas, which is one of the features of the present invention, sensitively, the method of coexisting with phosphorus to promote the erosion of platinum wire by hydrogen gas is described as follows.
The detection sensor is housed in a thin metal tube having a thickness of about 2 to 6.4 mm and having heat resistance and corrosion resistance, and a detection section having a platinum thin wire wound thereon or a detection section of a platinum thin film and a sheath of the housing. Is filled with cement mixed with phosphorus powder.
【００１３】[0013]
【実施例】本発明の実施例を添付した図面に従って説明
する。白金の検知部１．を収容する鞘としては０．７ｍ
ｍの肉厚，外径６．４ｍｍ，内径５．０ｍｍＳＵＳ３１
６ステンレス鋼管２．中に収容し、燐の粉末をアルミナ
・セメント内に１％以下の量を混ぜて、前記白金の検知
部１．とステンレス鋼管２．との空隙に充填して充填層
３．となし、検知部１．にあってはφ２５μｍの白金の
細線１２０ｃｍ長さのものをアルミナ成形、焼結して作
ったφ３ｍｍ×３０ｍｍＬの巻枠に線同志が接触しない
ように巻き着け、該白金線の両端は各々導線４．に接続
して電源５．及び抵抗計６．に至る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the accompanying drawings. Platinum detector 0.7m as a sheath to accommodate
m thickness, outer diameter 6.4mm, inner diameter 5.0mm SUS31
6 stainless steel pipe And the phosphorous powder is mixed in an alumina cement in an amount of 1% or less in the alumina cement. And stainless steel pipe And filling the gap with the filling layer. Detector 1. In this method, a platinum wire having a length of φ25 μm and having a length of 120 cm is wound around a winding frame of φ3 mm × 30 mmL formed by alumina molding and sintering so that the wires do not come into contact with each other. . 4. Connect to power supply And resistance meter 6. Leads to.
【００１４】前記電源５．より１mAの電流を印加して検
出部１．に於ける白金線の抵抗を抵抗計で見ることが出
来、又抵抗に変化があった時には警報装置を介して知る
ことが出来た。The power supply 5. A current of 1 mA is applied to the detection unit 1. The resistance of the platinum wire at the above can be seen with a resistance meter, and when there was a change in the resistance, it could be known through an alarm device.
【００１５】[0015]
【発明の効果】本発明に於ける水素ガス検知センサを使
用してアンモニア分解水素還元炉中に挿入して実験を繰
り返すなどしたところ１，０５０〜１，１５０℃の高温
度に耐えて、しかも高温、高濃度であるほどに鋭敏に検
知することが分かった。The hydrogen gas detection sensor according to the present invention was inserted into an ammonia decomposition hydrogen reduction furnace, and the experiment was repeated. As a result, it could withstand a high temperature of 1,050 to 1,150 ° C. It was found that the higher the temperature and the higher the concentration, the more sensitive the detection.
【図１】本水素ガス漏洩検出センサの横断面図をしめ
す。FIG. 1 shows a cross-sectional view of the present hydrogen gas leak detection sensor.
１ アルミナ焼結基盤 ２ 白金線又は白金蒸着薄膜 ３ 燐又は燐酸化物を混入したセメントの充填層 ４ 導線 ５ ステンレス・パイプ DESCRIPTION OF SYMBOLS 1 Alumina sintering base 2 Platinum wire or platinum vapor-deposited thin film 3 Filling layer of cement mixed with phosphorus or phosphor oxide 4 Conductor 5 Stainless steel pipe
Claims (2)
度で水素に侵食されて電気抵抗値が増すことを利用して
白金又は白金の蒸着薄膜の電気抵抗値の変化を捕捉して
水素ガスの漏洩を検知することを特徴とする水素ガス漏
洩検知センサThe present invention relates to a hydrogen gas detection sensor, in which platinum is eroded by hydrogen at a high temperature to increase the electric resistance value, and the change in the electric resistance value of platinum or a vapor-deposited thin film of platinum is captured to generate hydrogen gas. Gas leak detection sensor for detecting hydrogen leakage
って検知部を埋設、充填する無機絶縁材中に燐又は燐の
酸化物を0.5％〜２％混在させ白金と燐を反応させて検
知部とする白金線を侵食させ白金線の抵抗値に変化を与
えることを特徴とする検知センサ。2. The hydrogen gas leak detection sensor according to claim 1, wherein the detection portion is embedded and mixed with 0.5% to 2% of phosphorus or an oxide of phosphorus in the inorganic insulating material to be filled and reacted by platinum and phosphorus. A detection sensor characterized by eroding a platinum wire serving as a part to change the resistance value of the platinum wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001027994A JP3913990B2 (en) | 2001-02-05 | 2001-02-05 | Hydrogen gas leak detection sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001027994A JP3913990B2 (en) | 2001-02-05 | 2001-02-05 | Hydrogen gas leak detection sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002228615A true JP2002228615A (en) | 2002-08-14 |
| JP3913990B2 JP3913990B2 (en) | 2007-05-09 |
Family
ID=18892563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001027994A Expired - Fee Related JP3913990B2 (en) | 2001-02-05 | 2001-02-05 | Hydrogen gas leak detection sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3913990B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005331284A (en) * | 2004-05-18 | 2005-12-02 | Kobe Steel Ltd | Hydrogen gas detecting agent and hydrogen gas detecting device |
| JP2007178377A (en) * | 2005-12-28 | 2007-07-12 | Showa Denko Kk | Gas sensor, reactive gas leak detector, and detection method |
| JP2008537719A (en) * | 2005-04-08 | 2008-09-25 | エア プロダクツ アンド ケミカルズ インコーポレイテッド | Method and system for supply and delivery of products contained in a carrier |
| JP2009133782A (en) * | 2007-11-30 | 2009-06-18 | Seiko Instruments Inc | Hydrogen sensor |
-
2001
- 2001-02-05 JP JP2001027994A patent/JP3913990B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005331284A (en) * | 2004-05-18 | 2005-12-02 | Kobe Steel Ltd | Hydrogen gas detecting agent and hydrogen gas detecting device |
| JP2008537719A (en) * | 2005-04-08 | 2008-09-25 | エア プロダクツ アンド ケミカルズ インコーポレイテッド | Method and system for supply and delivery of products contained in a carrier |
| JP2007178377A (en) * | 2005-12-28 | 2007-07-12 | Showa Denko Kk | Gas sensor, reactive gas leak detector, and detection method |
| JP2009133782A (en) * | 2007-11-30 | 2009-06-18 | Seiko Instruments Inc | Hydrogen sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3913990B2 (en) | 2007-05-09 |
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Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20061115 |
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