JPH0210455Y2 - - Google Patents
Info
- Publication number
- JPH0210455Y2 JPH0210455Y2 JP76482U JP76482U JPH0210455Y2 JP H0210455 Y2 JPH0210455 Y2 JP H0210455Y2 JP 76482 U JP76482 U JP 76482U JP 76482 U JP76482 U JP 76482U JP H0210455 Y2 JPH0210455 Y2 JP H0210455Y2
- Authority
- JP
- Japan
- Prior art keywords
- atmosphere
- furnace
- oxygen concentration
- electrode
- contact
- 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.)
- Expired
Links
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
- 239000001301 oxygen Substances 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 22
- 239000003054 catalyst Substances 0.000 claims description 5
- 229910017052 cobalt Inorganic materials 0.000 claims description 5
- 239000010941 cobalt Substances 0.000 claims description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- 229910052596 spinel Inorganic materials 0.000 claims description 5
- 239000011029 spinel Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 14
- 238000005255 carburizing Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 229910002076 stabilized zirconia Inorganic materials 0.000 description 1
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
Description
【考案の詳細な説明】
本考案は炉内雰囲気の平衡状態からの乖離度を
検出する炉内雰囲気の平衡度検出装置に係り、特
に、ガス浸炭或は浸炭浸窒等の雰囲気熱処理操作
を行つている炉内の雰囲気の平衡状態からの乖離
度を検出するに好適な平衡度検出装置に関する。[Detailed description of the invention] The present invention relates to an apparatus for detecting the degree of equilibrium of the furnace atmosphere, which detects the degree of deviation of the furnace atmosphere from the equilibrium state. The present invention relates to an equilibrium degree detection device suitable for detecting the degree of deviation of the atmosphere in a furnace from an equilibrium state.
ガス浸炭熱処理炉内は、理想的な平衡状態にお
いてはメタンの空気酸化によつて生じたCO，
H2，N2を主成分とする所謂、吸熱型ガス雰囲気
とされ、このCOが
2CO＋Fe＝Fe〔Ｃ〕＋CO2
なる反応を行い、浸炭反応が行われる。 In an ideal equilibrium state, inside the gas carburizing heat treatment furnace, CO generated by air oxidation of methane,
A so-called endothermic gas atmosphere containing H 2 and N 2 as main components is created, and this CO undergoes the reaction 2CO+Fe=Fe[C]+CO 2 , resulting in a carburizing reaction.
そのため、雰囲気中の酸素分圧を検知すること
によつて炉内雰囲気のカーボンポテンシヤル（浸
炭能）を検知することができる。 Therefore, by detecting the oxygen partial pressure in the atmosphere, the carbon potential (carburizing ability) of the atmosphere in the furnace can be detected.
従来このような炉内雰囲気中の酸素分圧を検知
するものとして、ジルコニア固体電解質からなる
酸素濃淡電池が用いられている。これは、安定化
ジルコニアが高温時に酸素濃度による濃淡電池と
して働く特性を利用したものである。 Conventionally, an oxygen concentration battery made of a zirconia solid electrolyte has been used to detect the oxygen partial pressure in the atmosphere inside the furnace. This utilizes the property of stabilized zirconia that acts as a concentration cell depending on the oxygen concentration at high temperatures.
しかるに、実際の操業に際しては、雰囲気のカ
ーボンポテンシヤルを調整するために炉内にエン
リツチガスと称せられるプロパンガス、ブタンガ
ス等の炭化水素ガスが供給される。この場合、エ
ンリツチガスが過剰であると、実際の炉内雰囲気
は非平衡状態となり、
CmHn→mC＋ｎ／２H2
のような炭化水素の直接分解による煤の析出（ス
ーテイング）及び
CmHn＋mFe→mFe〔Ｃ〕＋ｎ／２H2
なる炭化水素による直接浸炭反応が生じる。その
ため上述の平衡状態での浸炭反応を前提とした酸
素濃淡電池による測定方法では、実際の炉内雰囲
気の状態、即ち、直接浸炭反応によるカーボンポ
テンシヤルの上昇及び炭化水素の直接分解による
炉内のスーテイング等が生ずるという非平衡状態
を検知することはできない。 However, during actual operation, a hydrocarbon gas such as propane gas or butane gas, called enrichment gas, is supplied into the furnace in order to adjust the carbon potential of the atmosphere. In this case, if the enrichment gas is excessive, the actual atmosphere in the furnace will be in a non-equilibrium state, resulting in the precipitation of soot (sooting) due to the direct decomposition of hydrocarbons such as CmHn→mC+n/2H 2 and CmHn+mFe→mFe[C]+n /2H 2 direct carburization reaction with hydrocarbons occurs. Therefore, in the measurement method using an oxygen concentration cell that assumes the carburizing reaction in the equilibrium state described above, it is difficult to measure the actual furnace atmosphere, that is, the increase in carbon potential due to the direct carburizing reaction and the sooting in the furnace due to the direct decomposition of hydrocarbons. It is not possible to detect a non-equilibrium state in which
本考案は係る現実に鑑みてなされたものであつ
て、その目的とするところは、炉内雰囲気の平衡
状態からの乖離度を検知することができる炉内雰
囲気の平衡度検出装置を提供するにある。 The present invention has been developed in view of the above circumstances, and its purpose is to provide a device for detecting the equilibrium level of the furnace atmosphere, which can detect the degree of deviation of the furnace atmosphere from the equilibrium state. be.
この目的を達成するために、本考案は、炉内雰
囲気の酸素ポテンシヤルを検知する酸素濃淡電池
と、コバルトスピネル系触媒を介して雰囲気と接
触する異なる酸素濃淡電池とを炉内に設け、両者
の電位差により炉内雰囲気の平衡状態からの乖離
度を検出するようにしたものである。 In order to achieve this objective, the present invention provides an oxygen concentration battery that detects the oxygen potential of the atmosphere in the furnace and a different oxygen concentration battery that contacts the atmosphere through a cobalt spinel catalyst. The degree of deviation of the atmosphere in the furnace from the equilibrium state is detected by the potential difference.
以下図面に基づいて本考案の実施例を説明す
る。 Embodiments of the present invention will be described below based on the drawings.
第１図は本考案の実施例に係る検出装置の構成
を示す図である。図において１０は第１の酸素濃
淡電池であつて、一方の電極１２は基準雰囲気
（本実施例においては大気）１３に接し他方の電
極１４は炉内雰囲気１６に接している。又、１８
は第２の酸素濃淡電池であつて、一方の電極２０
は大気に接し、他方の電極２２はコバルトスピネ
ル系触媒２４を介して炉内雰囲気１６に接してい
る。図中２６，２８は酸素濃淡電池を形成する固
体電解質であつて、本実施例においてはイツトリ
アで安定化されたジルコニアが採用されている。
又、電極１２，１４，２０，２２は夫々白金製と
されている。図中V1，V2は電位差計、３０は炉
壁である。 FIG. 1 is a diagram showing the configuration of a detection device according to an embodiment of the present invention. In the figure, reference numeral 10 denotes a first oxygen concentration cell, in which one electrode 12 is in contact with a reference atmosphere (air in this embodiment) 13 and the other electrode 14 is in contact with a furnace atmosphere 16. Also, 18
is a second oxygen concentration battery, in which one electrode 20
is in contact with the atmosphere, and the other electrode 22 is in contact with the furnace atmosphere 16 via a cobalt spinel catalyst 24. In the figure, 26 and 28 are solid electrolytes forming an oxygen concentration battery, and in this embodiment, zirconia stabilized with ittria is used.
Further, the electrodes 12, 14, 20, and 22 are each made of platinum. In the figure, V 1 and V 2 are potentiometers, and 30 is a furnace wall.
このように構成された装置においては、第１の
酸素濃淡電池１０は実際の炉内雰囲気１６中の酸
素分圧（酸素ポテンシヤル）を検出する。又、第
２の酸素濃淡電池１８は、コバルトスピネル系触
媒を介して雰囲気ガス１６と接触しているところ
から、炉内雰囲気１６が平衡状態となつている時
の酸素ポテンシヤルを検出する。そのためV1で
検出される両電池１０，１８の起電力に差は実際
の炉内雰囲気の平衡状態からの乖離度を示すよう
になる。又、V2で検出される電位差は、第１の
酸素濃淡電池１０における起電力を示すものであ
るから、炉内雰囲気のカーボンポテンシヤルを示
すようになる。 In the apparatus configured in this manner, the first oxygen concentration cell 10 detects the actual oxygen partial pressure (oxygen potential) in the furnace atmosphere 16. The second oxygen concentration cell 18 is in contact with the atmospheric gas 16 via a cobalt spinel catalyst, and thus detects the oxygen potential when the furnace atmosphere 16 is in an equilibrium state. Therefore, the difference between the electromotive forces of both batteries 10 and 18 detected at V 1 indicates the degree of deviation of the actual atmosphere in the furnace from the equilibrium state. Further, since the potential difference detected at V 2 indicates the electromotive force in the first oxygen concentration battery 10, it indicates the carbon potential of the atmosphere in the furnace.
そのためV1に示される起電力差を読み取るこ
とによつて、炉内雰囲気１６の平衡状態からの乖
離度を検知することができる。 Therefore, by reading the electromotive force difference shown by V 1 , the degree of deviation of the furnace atmosphere 16 from the equilibrium state can be detected.
第２図は、本実施例装置を用いてガス浸炭熱処
理炉内雰囲気を測定した結果の一例である。即
ち、吸熱型ガスにC4H10ガスをエンリツチガスと
して供給し、この添加量を０〜1.2（対吸熱型ガス
比）％の範囲で調整しながらV1で示される起電
力差（ミリボルト）を測定した。第２図に示され
るように、C4H10エンリツチガス供給量を増すに
つれ、実際の起電力差は次第に大きくなり平衡状
態からの乖離度が大きくなるが、起電力差が一定
値を超えると炉内にスーテイングが生じる。その
ため本装置を炉内スーテイング検出装置として用
いることもできることが認められた。 FIG. 2 is an example of the results of measuring the atmosphere inside the gas carburizing heat treatment furnace using the apparatus of this embodiment. That is, C 4 H 10 gas is supplied to the endothermic gas as an enrichment gas, and while adjusting the addition amount in the range of 0 to 1.2% (ratio to the endothermic gas), the electromotive force difference (millivolts) indicated by V 1 is increased. It was measured. As shown in Figure 2, as the C 4 H 10 enriched gas supply amount increases, the actual electromotive force difference gradually increases and the degree of deviation from the equilibrium state increases, but when the electromotive force difference exceeds a certain value, the furnace Sooting occurs within the body. Therefore, it was recognized that this device can also be used as an in-furnace sooting detection device.
以上の通り本考案の炉内雰囲気の平衡度検出装
置によれば、炉内雰囲気の平衡状態からの乖離度
を検出することができる。又、炉内スーテイング
等の異常状態を検知することができる。さらに炉
内のカーボンポテンシヤルを正確に測定し、これ
に基いて制御することができるようになり、均一
な熱処理等の操作を行うことが可能とされる。 As described above, according to the apparatus for detecting the balance of the furnace atmosphere according to the present invention, it is possible to detect the degree of deviation of the furnace atmosphere from the equilibrium state. Additionally, abnormal conditions such as sooting in the furnace can be detected. Furthermore, it becomes possible to accurately measure the carbon potential in the furnace and control it based on this, making it possible to perform operations such as uniform heat treatment.
第１図は本考案の実施例に係る検出装置の構成
を示す図、第２図は第１図の装置を用いた測定結
果の一例を示す図である。
１０……第１の酸素濃淡電池、１８……第２の
酸素濃淡電池、１２，１４，２０，２２……電
極、２４……コバルトスピネル系触媒。
FIG. 1 is a diagram showing the configuration of a detection device according to an embodiment of the present invention, and FIG. 2 is a diagram showing an example of measurement results using the device of FIG. 1. 10... First oxygen concentration battery, 18... Second oxygen concentration battery, 12, 14, 20, 22... Electrode, 24... Cobalt spinel catalyst.
Claims (1)
炉内雰囲気に接する第１の酸素濃淡電池と、一
方の電極は基準雰囲気に接し他方の電極はコバ
ルトスピネル系触媒を介して炉内雰囲気に接す
る第２の酸素濃淡電池と、該第１及び第２の酸
素濃淡電池の起電力の差を検出する電位差計と
を備えてなる炉内雰囲気の平衡度検出装置。 (2) 前記基準雰囲気は大気であることを特徴とす
る実用新案登録請求の範囲第１項記載の炉内雰
囲気の平衡度検出装置。[Claims for Utility Model Registration] (1) A first oxygen concentration battery in which one electrode is in contact with the reference atmosphere and the other electrode is in contact with the furnace atmosphere; one electrode is in contact with the reference atmosphere and the other electrode is made of cobalt spinel; Detecting the balance of the furnace atmosphere, comprising: a second oxygen concentration battery that is in contact with the furnace atmosphere via a system catalyst; and a potentiometer that detects the difference in electromotive force between the first and second oxygen concentration batteries. Device. (2) The apparatus for detecting the balance of the furnace atmosphere according to claim 1, wherein the reference atmosphere is the atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP76482U JPS58103366U (en) | 1982-01-07 | 1982-01-07 | Furnace atmosphere balance detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP76482U JPS58103366U (en) | 1982-01-07 | 1982-01-07 | Furnace atmosphere balance detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58103366U JPS58103366U (en) | 1983-07-14 |
| JPH0210455Y2 true JPH0210455Y2 (en) | 1990-03-15 |
Family
ID=30013822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP76482U Granted JPS58103366U (en) | 1982-01-07 | 1982-01-07 | Furnace atmosphere balance detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58103366U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016151517A (en) * | 2015-02-18 | 2016-08-22 | 新栄熱計装株式会社 | Carbon potential calculation device |
-
1982
- 1982-01-07 JP JP76482U patent/JPS58103366U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58103366U (en) | 1983-07-14 |
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