JPS6113147A - Diffusion-type combustible gas measuring method - Google Patents
Diffusion-type combustible gas measuring methodInfo
- Publication number
- JPS6113147A JPS6113147A JP13449784A JP13449784A JPS6113147A JP S6113147 A JPS6113147 A JP S6113147A JP 13449784 A JP13449784 A JP 13449784A JP 13449784 A JP13449784 A JP 13449784A JP S6113147 A JPS6113147 A JP S6113147A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- combustible gas
- combustible
- specimen
- hydrogen sulfide
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
- G01N33/0013—Sample conditioning by a chemical reaction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
- G01N33/0014—Sample conditioning by eliminating a gas
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
【発明の詳細な説明】
産−１」二の利 ′
この発明は、可燃ガスと硫化水素ガスとが共存する被検
ガス中に可燃ガスを検出するガスセンサを放置すること
により、自然拡散した被検ガスとガスセンサとを接触さ
せて可燃ガスを測定するようにした拡散式可燃ガス測定
方法に関する。[Detailed Description of the Invention] Product-1' Second Advantages ' This invention detects naturally diffused gas by leaving a gas sensor that detects combustible gas in a sample gas in which combustible gas and hydrogen sulfide gas coexist. The present invention relates to a diffusion type combustible gas measuring method in which combustible gas is measured by bringing a detection gas into contact with a gas sensor.
従」Ｌの」Ｌ術
近年、安全性向上の要請等から、マンホール内などにお
いて可燃ガスの濃度を簡易迅速に測定する必要か生じて
きた。このような場所におけるガスは、可燃ガスの外に
硫化水素ガスも共存していることが多く、このため、可
燃ガスを測定する際に従来の拡散式ガスセンサをそのま
ま使用すると、硫化水素ガスが可燃ガスとともにガス検
出素子に接触して以下のような問題点が発生するのであ
る。第１は、硫化水素ガスが腐食性を有しているため、
ガス検出素子およびその周辺の金属部分が腐食してしま
うという問題点である。第２は、ガス検出素子が接触燃
焼式の素子であると、白金属の触媒を使用していること
が多いが、この触媒の触媒機能が硫化水素ガスとの反応
によって消失してしまうという問題点である。第３は、
ガス検出素子が半導体素子であると、可燃ガスおよび硫
化水素ガスの両方の濃度を検出する場合があり、このよ
うな場合にはいずれのガスを検出しているのか不明であ
るという問題点である。In recent years, due to demands for improved safety, there has been a need to easily and quickly measure the concentration of combustible gas inside manholes and the like. Gases in such places often contain hydrogen sulfide gas in addition to combustible gas, so if you use a conventional diffusion-type gas sensor as is when measuring combustible gas, hydrogen sulfide gas will become flammable. When the gas comes into contact with the gas detection element, the following problems occur. First, because hydrogen sulfide gas is corrosive,
The problem is that the gas detection element and the metal parts around it corrode. The second problem is that when the gas detection element is a catalytic combustion type element, it often uses a platinum metal catalyst, but the catalytic function of this catalyst is lost due to reaction with hydrogen sulfide gas. It is a point. The third is
If the gas detection element is a semiconductor element, it may detect the concentration of both combustible gas and hydrogen sulfide gas, and in such cases, it is unclear which gas is being detected. .
仝（１か 決しようと る間 欝
この発明は、硫化水素ガスによって金属部分か腐食され
たり、触媒機能が消失したり、あるいはいずれのガスを
検出しているか不明であるという従来の問題点を解決す
るものである。This invention solves the conventional problems of metal parts being corroded by hydrogen sulfide gas, catalytic function disappearing, or it being unclear which gas is being detected. It is something to be solved.
問題点−１るための手ｌ：ｎ−
このような問題点は、可燃ガスと硫化水素ガスとが共存
する被検ガス中に可燃ガスを検出するガスセンサを放置
することにより、自然拡散した被検ガスとガスセンサと
を接触させて可燃ガスを測定するようにした拡散式可燃
ガス測定方法であって、前記被検ガスを、ガスセンサの
周囲を囲むよう配置され水酸化第２鉄を含む除去層を通
過させて硫化水素ガスを除去した後、ガスセンサに接触
させることにより解決することができる。Problem 1: Steps to take: n- Such a problem can be solved by leaving a gas sensor that detects combustible gas in a test gas where combustible gas and hydrogen sulfide gas coexist. A diffusion type combustible gas measuring method in which a combustible gas is measured by bringing a test gas into contact with a gas sensor, the test gas being removed by a removal layer containing ferric hydroxide, which is arranged so as to surround the gas sensor. This can be solved by removing the hydrogen sulfide gas by passing it through and then contacting it with the gas sensor.
色囲
可燃ガスと硫化水素ガスとが共存する被検ガス中にガス
センサを放置すると、被検ガスは自然拡散しながら除去
層を通過する。この際、被検ガス中の硫化水素ガスが水
酸化第２鉄と以下のように反応して除去される。When a gas sensor is left in a test gas in which combustible gas and hydrogen sulfide gas coexist, the test gas passes through the removal layer while naturally diffusing. At this time, hydrogen sulfide gas in the test gas is removed by reacting with ferric hydroxide as described below.
Ｆｅ２Ｏ，−３Ｈ２Ｏ＋ ３ Ｈ２Ｓ ＝ Ｆｅ介３＋
６ Ｈ２Ｏここで、−１−記反応はその速度か速いた
め、除去層の厚さを薄くすることかできる。このように
して硫化水素ガスが除去された被検ガスがガスセンサに
接触し、被検ガス中の可燃ガスが測定される。Fe2O, -3H2O+ 3 H2S = Fe-mediated 3+
6 H2O Here, since the -1- reaction is fast, the thickness of the removal layer can be made thin. The test gas from which hydrogen sulfide gas has been removed in this way contacts the gas sensor, and the combustible gas in the test gas is measured.
また、前述した反応により生成された硫化鉄は空気中の
水分（湿気）および酸素ガスと以下のように反応し、再
び水酸化第２鉄に再生する。Further, the iron sulfide produced by the above-described reaction reacts with moisture (humidity) in the air and oxygen gas as described below, and is regenerated into ferric hydroxide.
２Ｆｅ２−＋６Ｈ２０＋３０２＝２Ｆｅ２０３・６Ｈ２
０＋ Ｓ
この結果、除去層を交換することなく半永久的に使用す
ることができる。2Fe2-+6H20+302=2Fe203・6H2
0+S As a result, the removal layer can be used semi-permanently without being replaced.
支厘遣
以下、この発明を実施するための装置の一実施例を図面
に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an apparatus for carrying out the present invention will be described below with reference to the drawings.
第１図において、 １は検出部本体であり、この検出部
本体 １はメタン等の可燃ガスおよび硫化水素ガスが共
存する被検ガス中に放置されている。検出部本体１は略
円筒状のボディ ２を有し、このボディ ２には円板状
の基板３か取り付けられている。基板３には互いに平行
な２対のステー４、５か固定され、一方の対をなすステ
ー４間には前記可燃ガスを検出する、例えば接触燃焼式
のガス検出素子８が張り渡されている。前記残りの対を
なすステー５間には可燃ガスに対して不活性のＭ１ｊ償
素子 ７が張り渡されている。 ８、９は基板３に嵌合
ｙれた仕切板であり、これらの仕切板８、９は補償素子
７がガス検出素子６の熱影響を受けるのを阻止する。前
述したステー４、５、・ガス検出素子６、補償素子７は
全体として、自然拡ｎｋ Ｌだ前記被検ガスに接触した
とき可燃ガスを検出してその濃度を測定するガスセンサ
１ｏを構成する。１１は有底円筒状の内カバーであり、
この内カバー１１は防爆のために必す設けられる。この
内力／＜−］１は前記ガスセンサ１ｏの周囲を囲むよう
配置され、通気性の良好な焼結金属から構成されている
。１２は内方、＜−１１の周囲を囲むよう配置さ゛れた
有底円筒状の外カバーであり、この外カバー１２は前記
内カバー１１の破損防止のために必ず設けられている。In FIG. 1, reference numeral 1 denotes a detection unit main body, and this detection unit main body 1 is left in a sample gas in which combustible gas such as methane and hydrogen sulfide gas coexist. The detection unit main body 1 has a substantially cylindrical body 2, and a disc-shaped substrate 3 is attached to the body 2. Two pairs of stays 4 and 5 parallel to each other are fixed to the substrate 3, and a gas detection element 8 of, for example, a catalytic combustion type, for detecting the combustible gas is stretched between one pair of the stays 4. . An M1j compensation element 7, which is inert to combustible gas, is stretched between the remaining pairs of stays 5. Reference numerals 8 and 9 denote partition plates fitted into the substrate 3, and these partition plates 8 and 9 prevent the compensation element 7 from being affected by the heat of the gas detection element 6. The stays 4, 5, gas detection element 6, and compensation element 7 described above collectively constitute a gas sensor 1o that detects combustible gas and measures its concentration when it comes into contact with the natural expansion test gas. 11 is a bottomed cylindrical inner cover;
This inner cover 11 is indispensably provided for explosion protection. This internal force /<-]1 is arranged so as to surround the gas sensor 1o, and is made of sintered metal with good air permeability. Reference numeral 12 denotes a bottomed cylindrical outer cover disposed so as to surround <-11 on the inside, and this outer cover 12 is always provided to prevent the inner cover 11 from being damaged.
そして、この外カバー１２には複数の貫通孔１３が形成
されている。前記内カバー１１と外カバー１２との間に
は空隙が生しており、この空隙内にはガスセンサ１０の
周囲を囲む除去層１４が収納されている。この除去層１
４は、例えばグラスウールにグリセリンを含浸させ、さ
らに水酸化第２鉄の粉末をこれらの表面に刺着させたも
のが使用されている。なお、この発明においては前記グ
ラスウールの代わりに、不織布、石綿、スポンジ等の通
気性の良好なものを用いてもよい。また、前記グリセリ
ンは吸湿性を有しているため、グラスウールの表面か湿
潤状態となって水酸化第２鉄の粉末の付着性が良好とな
るとともに、水酸化第２鉄と硫化水素ガスとの反応の際
に使用される水分を補給する。前記除去層１４中の水酸
化第２鉄は。A plurality of through holes 13 are formed in this outer cover 12. A gap is formed between the inner cover 11 and the outer cover 12, and a removal layer 14 surrounding the gas sensor 10 is housed in the gap. This removal layer 1
4 is made by impregnating glass wool with glycerin and further adhering ferric hydroxide powder to the surface thereof. In this invention, instead of the glass wool, a material with good air permeability such as nonwoven fabric, asbestos, or sponge may be used. In addition, since the glycerin has hygroscopic properties, the surface of the glass wool becomes wet and the ferric hydroxide powder adheres well, and the ferric hydroxide and hydrogen sulfide gas Replenishes the water used during the reaction. The ferric hydroxide in the removal layer 14 is.
この除去層１４を被検ガスが通過する際、被検ガス中の
硫化水素ガスと反応してガスセンサ１０に悪影響を与え
る硫化水素ガスを除去する。このように、除去層】４を
従来から存在していた内力／＜ １１と外カバー１２
との間の空隙に収納するようにしているので、構造が簡
単になるとともに安価に製作できる。前記ガス検出素子
６および補償素子７は、第２図に示すように直列に接続
されて第１の直列２辺１５を構成するとともに、２個の
抵抗素子１６．１７が直列に接続されて第２の直列２辺
１８を構成し、これら第１、第２の直列２辺１５．１８
が並列接続されてブリッジ回路１９が構成されている。When the test gas passes through this removal layer 14, the hydrogen sulfide gas that reacts with the hydrogen sulfide gas in the test gas and adversely affects the gas sensor 10 is removed. In this way, the removed layer】4 is replaced by the conventionally existing internal force/<11 and the outer cover 12
Since it is housed in the space between the two, the structure is simple and it can be manufactured at low cost. The gas detection element 6 and the compensation element 7 are connected in series to form two first series sides 15, as shown in FIG. 2, and these first and second two serial sides 15.18
are connected in parallel to form a bridge circuit 19.
前記接続点は入力端子２０．２１を構成し、これら入力
端子２０．２１には直流電源２２が接続されている。一
方、前記第１、第２の直列２辺１５．１８の中間接続点
は出力端子２３．２４を構成し、これらの出力端子２３
．２４には表示器２５が接続されている。The connection points constitute input terminals 20.21, to which a DC power supply 22 is connected. On the other hand, the intermediate connection point between the first and second series sides 15.18 constitutes an output terminal 23.24, and these output terminals 23
．． A display 25 is connected to 24.
次に、この発明の一実施例の作用について説明する。Next, the operation of one embodiment of the present invention will be explained.
今、第１図に示すような検出部本体 １が、可燃ガスお
よび硫化水素ガスが共存する被検ガス中に放置されてい
るとする。このとき、被検ガスは自然拡散して貫通孔１
３．除去層１４、内カバー１１を通過して、ガスセンサ
１０に到達する。このとき、被検ガス中の硫化水素ガス
は、除去層１４中の水酸化第２鉄と以下のように反応し
除去される。Now, it is assumed that the detection unit main body 1 as shown in FIG. 1 is left in a sample gas in which combustible gas and hydrogen sulfide gas coexist. At this time, the test gas naturally diffuses into the through hole 1.
3. It passes through the removal layer 14 and the inner cover 11 and reaches the gas sensor 10. At this time, hydrogen sulfide gas in the test gas reacts with ferric hydroxide in the removal layer 14 as follows and is removed.
Ｆｅ２０９・３Ｈ２０＋３Ｈ２Ｓ−Ｆｅ２ｓＢ＋６Ｈ２
０この結果、ガス検出素子６に白金属の触媒を使用して
いても、その触媒機能が低下することはなく、また、ス
テー４．５、仕切板８等の金属部分が腐食されるような
こともない。そして、被検ガス中の可燃ガスはガス検出
素子６に接触したとき、ガス検出素子６の表面で燃焼す
る。これにより、ガス検出素子８か加熱されてその抵抗
値が大きくなる。一方、補償素子７の表面においては可
燃ガスは燃焼しないので、その抵抗値は変化せず、この
結果、ブリッジ回路１８のバランスが崩れて可燃ガスの
濃度に対応した電流が表示器２５に送られ、可燃ガスの
濃度が測定される。この可燃ガスの濃度測定によって、
除去層１４中の水酸化第２鉄は前述のように硫化鉄とな
るが、この検出部本体１を硫化水素ガスから遠ざけてや
れば、前記硫化鉄は空気中の水分（湿気）および酸素と
以下のように反応して再び水酸化第２鉄に再生する。Fe209・3H20+3H2S-Fe2sB+6H2
0 As a result, even if a platinum metal catalyst is used in the gas detection element 6, its catalytic function will not deteriorate, and metal parts such as the stay 4.5 and the partition plate 8 will not be corroded. Not at all. When the combustible gas in the test gas comes into contact with the gas detection element 6, it burns on the surface of the gas detection element 6. This heats the gas detection element 8 and increases its resistance value. On the other hand, since the combustible gas does not burn on the surface of the compensation element 7, its resistance value does not change, and as a result, the bridge circuit 18 becomes unbalanced and a current corresponding to the concentration of combustible gas is sent to the indicator 25. , the concentration of combustible gas is measured. By measuring the concentration of this combustible gas,
The ferric hydroxide in the removal layer 14 turns into iron sulfide as described above, but if the main body 1 of the detection section is moved away from the hydrogen sulfide gas, the iron sulfide is converted to moisture (humidity) and oxygen in the air. It is regenerated into ferric hydroxide through the following reaction.
２Ｆｅ２Ｓ３＋６Ｈ２０＋３０２−２Ｆｅ２０３・６Ｈ
２０＋ Ｓ
この結果、除去層１４を交換しなくても継続使用するこ
とができ、メンテナンスフリーとなる。2Fe2S3+6H20+302-2Fe203・6H
20+S As a result, the removal layer 14 can be used continuously without being replaced, and maintenance is free.
なお、前述の実施例においては、接触燃焼式のガスセン
サを用いて可燃ガスを測定する場合について説明したが
、この発明においては、半導体式のガスセンサを用いて
測定するようにしてもよい。In the above-mentioned embodiment, a case has been described in which combustible gas is measured using a catalytic combustion type gas sensor, but in the present invention, a semiconductor type gas sensor may be used for measurement.
介」ＬＱｊ「釆
以」二説明したように、この発明によれば、硫化水素ガ
スをガスセンサの直前で除去できるので、金属部分の腐
食、触媒機能の消失を防止できるとともに可燃ガスのみ
を検出することができる。As explained above, according to the present invention, hydrogen sulfide gas can be removed immediately before the gas sensor, thereby preventing corrosion of metal parts and loss of catalytic function, and detecting only combustible gas. be able to.
第１図はこの発明を実施するための装置の一実施例を示
す一部破断側面図、第２図はその回路図である。
２・・・ボディ ｌＯ・・・ガスセンサ１１・
・・内カバー １２・・・外力へ−１４・・・除
去層FIG. 1 is a partially cutaway side view showing an embodiment of an apparatus for carrying out the present invention, and FIG. 2 is a circuit diagram thereof. 2...Body lO...Gas sensor 11.
... Inner cover 12 ... To external force -14 ... Removal layer
Claims (1)
ガスを検出するガスセンサを放置することにより、自然
拡散した被検ガスとガスセンサとを接触させて可燃ガス
を測定するようにした拡散式可燃ガス測定方法であって
、前記被検ガスを、ガスセンサの周囲を囲むよう配置さ
れ水酸化第２鉄を含む除去層を通過させて硫化水素ガス
を除去した後、ガスセンサに接触させるようにしたこと
を特徴とする拡散式可燃ガス測定方法。A diffusion method that measures combustible gas by leaving a gas sensor that detects combustible gas in a test gas where combustible gas and hydrogen sulfide gas coexist, and then bringing the naturally diffused test gas into contact with the gas sensor. In the combustible gas measuring method, the test gas is passed through a removal layer containing ferric hydroxide and placed around a gas sensor to remove hydrogen sulfide gas, and then brought into contact with the gas sensor. A diffusion-type combustible gas measurement method characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13449784A JPS6113147A (en) | 1984-06-29 | 1984-06-29 | Diffusion-type combustible gas measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13449784A JPS6113147A (en) | 1984-06-29 | 1984-06-29 | Diffusion-type combustible gas measuring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6113147A true JPS6113147A (en) | 1986-01-21 |
| JPH0360385B2 JPH0360385B2 (en) | 1991-09-13 |
Family
ID=15129699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13449784A Granted JPS6113147A (en) | 1984-06-29 | 1984-06-29 | Diffusion-type combustible gas measuring method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6113147A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0432962A2 (en) * | 1989-12-13 | 1991-06-19 | The Governor And Company Of The Bank Of Scotland | Flammable gas detection |
| EP0656538A1 (en) * | 1993-11-22 | 1995-06-07 | Siemens Aktiengesellschaft | Gas sensor |
| EP0837324A2 (en) * | 1996-10-17 | 1998-04-22 | Denso Corporation | Gas concentration detecting device |
| CN105675660A (en) * | 2016-04-29 | 2016-06-15 | 国网上海市电力公司 | Bridge compensating circuit of insulating gas feature sensor |
| JP2019015687A (en) * | 2017-07-10 | 2019-01-31 | 新コスモス電機株式会社 | Contact combustion-type gas sensor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5871448A (en) * | 1981-10-23 | 1983-04-28 | Fuigaro Giken Kk | Gas detecting element for combustion apparatus |
-
1984
- 1984-06-29 JP JP13449784A patent/JPS6113147A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5871448A (en) * | 1981-10-23 | 1983-04-28 | Fuigaro Giken Kk | Gas detecting element for combustion apparatus |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0432962A2 (en) * | 1989-12-13 | 1991-06-19 | The Governor And Company Of The Bank Of Scotland | Flammable gas detection |
| EP0656538A1 (en) * | 1993-11-22 | 1995-06-07 | Siemens Aktiengesellschaft | Gas sensor |
| EP0837324A2 (en) * | 1996-10-17 | 1998-04-22 | Denso Corporation | Gas concentration detecting device |
| EP0837324A3 (en) * | 1996-10-17 | 2000-08-16 | Denso Corporation | Gas concentration detecting device |
| US6202469B1 (en) | 1996-10-17 | 2001-03-20 | Denso Corporation | Gas concentration detecting device |
| CN105675660A (en) * | 2016-04-29 | 2016-06-15 | 国网上海市电力公司 | Bridge compensating circuit of insulating gas feature sensor |
| JP2019015687A (en) * | 2017-07-10 | 2019-01-31 | 新コスモス電機株式会社 | Contact combustion-type gas sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0360385B2 (en) | 1991-09-13 |
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