JPH06174381A - Controlling equipment of atmosphere of furnace - Google Patents
Controlling equipment of atmosphere of furnaceInfo
- Publication number
- JPH06174381A JPH06174381A JP4321875A JP32187592A JPH06174381A JP H06174381 A JPH06174381 A JP H06174381A JP 4321875 A JP4321875 A JP 4321875A JP 32187592 A JP32187592 A JP 32187592A JP H06174381 A JPH06174381 A JP H06174381A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- atmosphere
- gas
- gas pressure
- proportional valve
- 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
- Regulation And Control Of Combustion (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Furnace Details (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、燃焼中に酸化性雰囲気
と還元性雰囲気との切り替えができる炉の雰囲気制御装
置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace atmosphere control device capable of switching between an oxidizing atmosphere and a reducing atmosphere during combustion.
【０００２】[0002]
【従来の技術】陶磁器類の焼成炉では、所定の温度まで
酸化性雰囲気で焼成を行い、その後に還元性雰囲気に切
り替える必要がある場合が多い。このため、従来は出力
に応じて空気／ガス比が変化するバルブをバーナーへの
ガス供給管路と空気供給管路に取り付けておき、ＣＯセ
ンサーにより炉内の雰囲気を監視しつつこのバルブの開
度を調整してバーナーの空気／ガス比を急激に変化さ
せ、還元性雰囲気への切り替えを行っていた。2. Description of the Related Art In a firing furnace for ceramics, it is often necessary to perform firing in a oxidizing atmosphere up to a predetermined temperature and then switch to a reducing atmosphere. For this reason, conventionally, a valve whose air / gas ratio changes according to the output is attached to the gas supply line to the burner and the air supply line, and this valve is opened while monitoring the atmosphere in the furnace with the CO sensor. The air / gas ratio of the burner was rapidly changed by adjusting the degree to switch to the reducing atmosphere.
【０００３】しかしこのような従来の方法では、焼成の
ヒートカーブが変化するとバルブの開度も変える必要が
あるため、それに応じて雰囲気も変化するおそれがあ
り、焼成のヒートカーブと独立させて炉の雰囲気制御を
行うことは容易ではなかった。また従来の方法では精度
の高いＣＯセンサーを使用する必要があり、設備コスト
が高くつくという問題もあった。However, in such a conventional method, since the opening of the valve needs to be changed when the heat curve of firing changes, the atmosphere may change accordingly, and the furnace is independent of the heat curve of firing. It was not easy to control the atmosphere. Further, in the conventional method, it is necessary to use a highly accurate CO sensor, which causes a problem that the equipment cost is high.
【０００４】[0004]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決して、焼成のヒートカーブとは独立させ
て容易に炉の雰囲気制御を行うことができる炉の雰囲気
制御装置を提供するために完成されたものである。SUMMARY OF THE INVENTION The present invention solves the above problems of the prior art and provides a furnace atmosphere control device capable of easily controlling the furnace atmosphere independently of the heat curve of firing. It was completed in order to do.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明は、炉のバーナーへのガス供給管路
と空気供給管路に全出力範囲にわたり空気／ガス比を一
定とする比例バルブをそれぞれ設けるとともに、ガス供
給管路の前記比例バルブより上流側には、出力に応じて
ガス圧を変化させるガス圧設定比例バルブを設けたこと
を特徴とするものである。SUMMARY OF THE INVENTION The present invention, which has been made to solve the above-mentioned problems, makes the air / gas ratio constant in the gas supply line and the air supply line to the burner of the furnace over the entire output range. A proportional valve is provided, and a gas pressure setting proportional valve that changes the gas pressure according to the output is provided upstream of the proportional valve in the gas supply line.
【０００６】[0006]
【実施例】以下に本発明を図示の実施例によって更に詳
細に説明する。図１は請求項１の発明の実施例を示すも
ので、１は炉体、２はバーナー、３はこのバーナー２へ
のガス供給管路、４は空気供給管路である。これらのガ
ス供給管路３と空気供給管路４にはそれぞれ比例バルブ
５、６が設けられている。これらの比例バルブ５、６
は、図２に示すように全出力範囲にわたり空気／ガス比
を一定とする機能を有するものであり、焼成のヒートカ
ーブに応じてバーナーの出力を変えても雰囲気を常に酸
化性雰囲気に維持することができる。The present invention will be described below in more detail with reference to the illustrated embodiments. FIG. 1 shows an embodiment of the invention of claim 1, 1 is a furnace body, 2 is a burner, 3 is a gas supply line to the burner 2, and 4 is an air supply line. Proportional valves 5 and 6 are provided in the gas supply line 3 and the air supply line 4, respectively. These proportional valves 5, 6
Has a function of keeping the air / gas ratio constant over the entire output range as shown in FIG. 2, and maintains the atmosphere always in an oxidizing atmosphere even if the output of the burner is changed according to the heat curve of firing. be able to.
【０００７】前記の空気供給管路４は図示しないブロア
に接続されており、常に一定圧力の空気が供給されるよ
うになっている。しかしガス供給管路３には比例バルブ
５よりも上流側にガス圧設定比例バルブ７が設けられて
いる。このガス圧設定比例バルブ７は図３に示すように
出力に比例してガス圧を変化させる機能を有するもの
で、プログラムコントローラ８により制御されるように
なっている。The air supply pipe line 4 is connected to a blower (not shown) so that air of a constant pressure is always supplied. However, a gas pressure setting proportional valve 7 is provided upstream of the proportional valve 5 in the gas supply line 3. The gas pressure setting proportional valve 7 has a function of changing the gas pressure in proportion to the output as shown in FIG. 3, and is controlled by the program controller 8.
【０００８】このように構成された炉では、図４に示す
ようにまずガス圧を一定としたままで比例バルブ５、６
の開度を変えてバーナー２の出力を変化させ、所定のヒ
ートカーブで昇温させる。この間はバーナー２の空気／
ガス比は一定に保たれているので、炉内は常に酸化性雰
囲気に維持されている。In the furnace thus constructed, as shown in FIG. 4, the proportional valves 5 and 6 are first maintained with the gas pressure kept constant.
The output of the burner 2 is changed by changing the opening degree of, and the temperature is raised by a predetermined heat curve. During this time, burner 2 air /
Since the gas ratio is kept constant, the inside of the furnace is always kept in an oxidizing atmosphere.
【０００９】そして所定の時間が経過したとき、プログ
ラムコントローラ８がガス圧設定比例バルブ７に信号を
送り図４に示すようにガス圧を急激に上昇させる。これ
に応じてガス供給管路３からバーナー２に供給されるガ
スの流量は増加するが、ガス供給管路３の比例バルブ５
の開度は一定のままであるために空気供給管路４の比例
バルブ６の開度は変わらない。その結果、炉内は急激に
還元性雰囲気に変化することとなる。しかもそのときの
ＣＯ濃度はガス圧の変化に応じて一定となるため、予め
プログラムコントローラ８によるガス圧設定値を定めて
おけば、厳密に炉内のＣＯ濃度を監視しなくてもＣＯ濃
度を±0.5 ％の精度で制御することができる。When a predetermined time has passed, the program controller 8 sends a signal to the gas pressure setting proportional valve 7 to rapidly increase the gas pressure as shown in FIG. In response to this, the flow rate of the gas supplied from the gas supply pipeline 3 to the burner 2 increases, but the proportional valve 5 of the gas supply pipeline 3 increases.
Since the opening degree of is kept constant, the opening degree of the proportional valve 6 of the air supply line 4 does not change. As a result, the inside of the furnace suddenly changes to a reducing atmosphere. Moreover, the CO concentration at that time becomes constant according to the change in the gas pressure. Therefore, if the gas pressure set value by the program controller 8 is set in advance, the CO concentration can be determined without strictly monitoring the CO concentration in the furnace. It can be controlled with an accuracy of ± 0.5%.
【００１０】図５は請求項２の発明の実施例を示すもの
で、炉体１内の酸素濃度を酸素濃度計９により監視し、
プログラムコントローラ８によるガス圧設定比例バルブ
７の制御にフィードバック制御をかけている。このよう
に構成すると酸素濃度計９が必要となるものの、還元性
雰囲気へ切り替えたときの炉内のＣＯ濃度を±0.2 ％の
精度で制御することができる。FIG. 5 shows an embodiment of the invention of claim 2, in which the oxygen concentration in the furnace body 1 is monitored by an oxygen concentration meter 9,
Feedback control is applied to the control of the gas pressure setting proportional valve 7 by the program controller 8. With this configuration, the oxygen concentration meter 9 is required, but the CO concentration in the furnace when switching to the reducing atmosphere can be controlled with an accuracy of ± 0.2%.
【００１１】[0011]
【発明の効果】以上に説明したように、本発明では炉の
バーナーへのガス供給管路と空気供給管路に全出力範囲
にわたり空気／ガス比を一定とする比例バルブをそれぞ
れ設けたので、雰囲気を酸化性雰囲気に保ったままで自
由に炉内の温度を制御することができ、任意の焼成ヒー
トカーブを得ることができる。またガス供給管路の前記
比例バルブより上流側に出力に応じてガス圧を変化させ
るガス圧設定比例バルブを設けたので、ガス供給管路の
ガス圧を変化させることによって炉内を急激に還元性雰
囲気に変化させることができる。従って本発明によれば
焼成のヒートカーブとは独立させて容易に炉の雰囲気制
御を行うことができることとなる。なお請求項１の発明
の場合には、炉内の雰囲気センサーを必要としないの
で、設備コストを低減できる利点もある。よって本発明
は従来の問題点を解消した炉の雰囲気制御装置として、
業界に寄与するところは極めて大である。As described above, according to the present invention, the gas supply line to the burner of the furnace and the air supply line are provided with the proportional valves for keeping the air / gas ratio constant over the entire output range. The temperature in the furnace can be freely controlled while keeping the atmosphere in an oxidizing atmosphere, and an arbitrary firing heat curve can be obtained. In addition, since a gas pressure setting proportional valve that changes the gas pressure according to the output is installed upstream of the proportional valve in the gas supply line, the gas pressure in the gas supply line is changed to rapidly reduce the inside of the furnace. It can change into a sexual atmosphere. Therefore, according to the present invention, the atmosphere of the furnace can be easily controlled independently of the heat curve of firing. In the case of the first aspect of the present invention, since the atmosphere sensor in the furnace is not required, there is an advantage that the facility cost can be reduced. Therefore, the present invention, as a furnace atmosphere control device to solve the conventional problems,
The contribution to the industry is extremely large.
【図１】請求項１の発明の実施例を示す配管系統図であ
る。FIG. 1 is a piping system diagram showing an embodiment of the invention of claim 1.
【図２】比例バルブの出力と空気／ガス比との関係を示
すグラフである。FIG. 2 is a graph showing the relationship between the output of a proportional valve and the air / gas ratio.
【図３】ガス圧設定比例バルブの出力とガス圧との関係
を示すグラフである。FIG. 3 is a graph showing the relationship between the output of a gas pressure setting proportional valve and the gas pressure.
【図４】ガス圧変化と炉内雰囲気変化との関係を示すグ
ラフである。FIG. 4 is a graph showing a relationship between a gas pressure change and a furnace atmosphere change.
【図５】請求項２の発明の実施例を示す配管系統図であ
る。FIG. 5 is a piping system diagram showing an embodiment of the invention of claim 2;
１ 炉体 ２ バーナー ３ ガス供給管路 ４ 空気供給管路 ５ 比例バルブ ６ 比例バルブ ７ ガス圧設定比例バルブ ８ プログラムコントローラ ９ 酸素濃度計 1 Furnace Body 2 Burner 3 Gas Supply Pipeline 4 Air Supply Pipeline 5 Proportional Valve 6 Proportional Valve 7 Gas Pressure Setting Proportional Valve 8 Program Controller 9 Oxygen Analyzer
Claims (2)
給管路に全出力範囲にわたり空気／ガス比を一定とする
比例バルブをそれぞれ設けるとともに、ガス供給管路の
前記比例バルブより上流側には、出力に応じてガス圧を
変化させるガス圧設定比例バルブを設けたことを特徴と
する炉の雰囲気制御装置。1. A proportional valve for maintaining a constant air / gas ratio over the entire output range is provided in each of the gas supply line and the air supply line to the burner of the furnace, and the gas supply line is upstream of the proportional valve. The atmosphere control device for a furnace is provided with a gas pressure setting proportional valve for changing the gas pressure according to the output.
応じて制御する請求項１記載の炉の雰囲気制御装置。2. The furnace atmosphere control device according to claim 1, wherein the gas pressure setting proportional valve is controlled according to the oxygen concentration of the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32187592A JP3187991B2 (en) | 1992-12-01 | 1992-12-01 | Furnace atmosphere control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32187592A JP3187991B2 (en) | 1992-12-01 | 1992-12-01 | Furnace atmosphere control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06174381A true JPH06174381A (en) | 1994-06-24 |
| JP3187991B2 JP3187991B2 (en) | 2001-07-16 |
Family
ID=18137382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32187592A Expired - Fee Related JP3187991B2 (en) | 1992-12-01 | 1992-12-01 | Furnace atmosphere control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3187991B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988004844A1 (en) * | 1986-12-23 | 1988-06-30 | Fanuc Ltd | High-frequency discharge-excited laser unit |
| CN101936667A (en) * | 2010-08-25 | 2011-01-05 | 盐城市康杰机械制造有限公司 | Explosion prevention system for fuel gas aluminum brazing thermal-degreasing furnace |
| KR101419880B1 (en) * | 2012-12-21 | 2014-07-16 | 주식회사 포스코 | Apparatus for manufacturing wire rod having gas booster |
| US8876524B2 (en) | 2012-03-02 | 2014-11-04 | Honeywell International Inc. | Furnace with modulating firing rate adaptation |
| US10094593B2 (en) | 2008-05-27 | 2018-10-09 | Honeywell International Inc. | Combustion blower control for modulating furnace |
-
1992
- 1992-12-01 JP JP32187592A patent/JP3187991B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1988004844A1 (en) * | 1986-12-23 | 1988-06-30 | Fanuc Ltd | High-frequency discharge-excited laser unit |
| US10094593B2 (en) | 2008-05-27 | 2018-10-09 | Honeywell International Inc. | Combustion blower control for modulating furnace |
| CN101936667A (en) * | 2010-08-25 | 2011-01-05 | 盐城市康杰机械制造有限公司 | Explosion prevention system for fuel gas aluminum brazing thermal-degreasing furnace |
| US8876524B2 (en) | 2012-03-02 | 2014-11-04 | Honeywell International Inc. | Furnace with modulating firing rate adaptation |
| KR101419880B1 (en) * | 2012-12-21 | 2014-07-16 | 주식회사 포스코 | Apparatus for manufacturing wire rod having gas booster |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3187991B2 (en) | 2001-07-16 |
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