JPH04314835A - Melt temperature controlling device for aluminum melting furnace - Google Patents
Melt temperature controlling device for aluminum melting furnaceInfo
- Publication number
- JPH04314835A JPH04314835A JP10861791A JP10861791A JPH04314835A JP H04314835 A JPH04314835 A JP H04314835A JP 10861791 A JP10861791 A JP 10861791A JP 10861791 A JP10861791 A JP 10861791A JP H04314835 A JPH04314835 A JP H04314835A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- hot water
- gas temperature
- furnace
- regulator
- 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.)
- Pending
Links
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 238000002844 melting Methods 0.000 title claims abstract description 11
- 230000008018 melting Effects 0.000 title claims abstract description 11
- 239000000446 fuel Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 239000000155 melt Substances 0.000 abstract 2
- 238000002485 combustion reaction Methods 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- 238000013021 overheating Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Regulation And Control Of Combustion (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明はアルミニウム溶解炉に
おいてアルミニウム溶湯の温度を制御する制御装置に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for controlling the temperature of molten aluminum in an aluminum melting furnace.
【０００２】0002
【従来の技術】一般にアルミニウム溶解炉における溶湯
の温度制御には、図２に示すように、炉体１内の溶湯２
に浸漬した熱電対３により湯温を検出し、湯温調節器４
により、湯温設定器５の設定湯温Ｔ０と検出湯温Ｔ１の
偏差に所定のＰＩＤ演算をおこない、得られた湯温調節
器４の出力信号Ｑを、バ−ナ６の燃焼量を制御する空燃
比制御装置７の流量目標信号とするカスケ−ド制御方法
が採用されている。[Prior Art] Generally, in order to control the temperature of molten metal in an aluminum melting furnace, as shown in FIG.
The hot water temperature is detected by the thermocouple 3 immersed in the hot water temperature regulator 4.
A predetermined PID calculation is performed on the deviation between the set hot water temperature T0 of the hot water temperature setting device 5 and the detected hot water temperature T1, and the resulting output signal Q of the hot water temperature regulator 4 is used to control the combustion amount of the burner 6. A cascade control method is adopted in which the target flow rate signal of the air-fuel ratio control device 7 is used to control the air-fuel ratio.
【０００３】なお１１は燃料配管、１２は燃料流量調節
弁、１３はこの弁の開度を調節して燃料流量を調節する
燃料流量調節器、１４は燃料流量検出器である。また１
５は空気配管、１６は空気流量調節弁、１７はこの弁の
開度を調節して空気流量を調節する空気流量調節器、１
８は空気流量検出器であり、１９は空燃比設定器である
。Note that 11 is a fuel pipe, 12 is a fuel flow rate control valve, 13 is a fuel flow rate regulator that adjusts the opening degree of this valve to control the fuel flow rate, and 14 is a fuel flow rate detector. Also 1
5 is an air pipe; 16 is an air flow rate control valve; 17 is an air flow rate regulator that adjusts the air flow rate by adjusting the opening degree of this valve;
8 is an air flow rate detector, and 19 is an air-fuel ratio setting device.
【０００４】0004
【発明が解決しようとする課題】ところが上記の制御方
法においては、バ−ナ６の燃焼量の変化に対して湯温の
応答が遅いため、湯温が設定湯温に対してオ−バ−シユ
−トすることが多く、湯温制御精度が劣り、溶湯の過熱
により溶湯の酸化損失や炉体耐火物の消耗が多いという
問題があつた。さらに湯温のみにより制御していたため
炉温や排ガス温度が装置限界値まで上昇し、バ−ナの燃
焼を遮断したり低燃焼に切替える緊急燃焼量カツト装置
が作動し、燃焼量の大巾変動により湯温制御精度が悪化
するという問題もあつた。However, in the above control method, the response of the hot water temperature to changes in the combustion amount of the burner 6 is slow, so the hot water temperature may exceed the set hot water temperature. There were problems in that the molten metal often shudded, the hot water temperature control accuracy was poor, and the overheating of the molten metal resulted in oxidation loss of the molten metal and a large amount of wear and tear on the furnace refractories. Furthermore, since the furnace temperature and exhaust gas temperature were controlled only by the hot water temperature, they rose to the device limit, and an emergency combustion amount cut device that shuts off burner combustion or switched to low combustion was activated, causing wide fluctuations in the combustion amount. There was also the problem that the accuracy of hot water temperature control deteriorated.
【０００５】この発明は上記従来の問題点を解決するも
ので、湯温制御精度が向上し、溶湯の過熱による酸化損
失や炉体耐火物の消耗を抑制できるアルミニウム溶解炉
の湯温制御装置を提供しようとするものである。The present invention solves the above-mentioned conventional problems, and provides a hot water temperature control device for an aluminum melting furnace that improves hot water temperature control accuracy and suppresses oxidation loss due to overheating of the molten metal and consumption of the furnace refractories. This is what we are trying to provide.
【０００６】[0006]
【課題を解決するための手段】この発明のアルミニウム
溶解炉の湯温制御装置は、バ−ナに供給される燃料と空
気の流量を制御量とする流量調節器をそなえた空燃比制
御装置と、湯温を制御量とする湯温調節器との間に、炉
温（炉内ガス温度）または排ガス温度を制御量とするガ
ス温度調節器を接続し、前記湯温調節器の出力信号を前
記ガス温度調節器の目標値として与えるとともに、前記
ガス温度調節器の出力信号を前記空燃比制御装置の目標
値として与えるようにしたことを特徴とする。[Means for Solving the Problems] The hot water temperature control device for an aluminum melting furnace of the present invention includes an air-fuel ratio control device equipped with a flow rate regulator that controls the flow rates of fuel and air supplied to a burner. , a gas temperature regulator whose controlled variable is the furnace temperature (furnace gas temperature) or exhaust gas temperature is connected between the hot water temperature regulator whose controlled variable is the hot water temperature, and the output signal of the hot water temperature regulator is connected. The gas temperature regulator is provided as a target value, and the output signal of the gas temperature regulator is provided as a target value of the air-fuel ratio control device.
【０００７】この発明においてガス温度調節器の入力部
（制御量入力部）には、炉温検出器または排ガス温度検
出器のいずれか一方を接続して用いてもよいが、炉温検
出器と排ガス温度検出器をハイセレクタを介して前記入
力部に接続し、炉温と排ガス温度のうちの高い方の検出
温度をガス温度調節器に制御量として入力するのが好ま
しい。In the present invention, either a furnace temperature detector or an exhaust gas temperature detector may be connected to the input section (controlled variable input section) of the gas temperature regulator. Preferably, an exhaust gas temperature detector is connected to the input section via a high selector, and the higher detected temperature of the furnace temperature and the exhaust gas temperature is inputted to the gas temperature regulator as a control variable.
【０００８】[0008]
【作用】この発明の湯温制御装置においては、湯温調節
器の出力信号は、ガス温度調節器にガス温度目標値とし
て入力され、ガス温度調節器と空燃比制御装置の制御ル
−プにより、炉温または排ガス温度が前記ガス温度目標
値になるように制御される。空燃比制御装置によるバ−
ナ燃焼量の変化に対し炉温または排ガス温度は迅速に応
答し、検出炉温または排ガス温度とガス温度設定値との
偏差は早期に減少するので、バ−ナによる長時間の過剰
熱量燃焼あるいは不足熱量燃焼に起因する湯温のオ−バ
−シユ−トを防止できる。[Operation] In the hot water temperature control device of the present invention, the output signal of the hot water temperature regulator is inputted to the gas temperature regulator as the gas temperature target value, and is controlled by the control loop of the gas temperature regulator and the air-fuel ratio control device. , the furnace temperature or the exhaust gas temperature is controlled so as to reach the gas temperature target value. bar by air-fuel ratio control device
The furnace temperature or exhaust gas temperature quickly responds to changes in the burner combustion amount, and the deviation between the detected furnace temperature or exhaust gas temperature and the gas temperature set value is quickly reduced. Overshoot of hot water temperature due to insufficient heat combustion can be prevented.
【０００９】また湯温の制御は、炉温または排ガス温度
を設定ガス温度に制御することによりおこなわれるので
、炉温または排ガス温度を炉体耐火物の寿命等によつて
定められた装置限界値以下に維持することができる。
なお一般に湯温制御をおこなう溶解中期以降は、炉温と
排ガス温度は近い値を示すので、炉温または排ガス温度
の一方を制御することにより炉温および排ガス温度の両
方を装置限界値以下に維持できるのであるが、炉温と排
ガス温度のうちの高い方の検出温度をハイセレクタを介
してガス温度調節器に入力すれば、炉温および排ガス温
度の両方を確実に装置限界値以下に維持できるので好ま
しい。Furthermore, since the hot water temperature is controlled by controlling the furnace temperature or exhaust gas temperature to a set gas temperature, the furnace temperature or exhaust gas temperature is kept at a device limit value determined by the life of the furnace refractories, etc. Can be maintained below. Generally, after the middle stage of melting when the hot water temperature is controlled, the furnace temperature and exhaust gas temperature are close to each other, so by controlling either the furnace temperature or the exhaust gas temperature, both the furnace temperature and the exhaust gas temperature can be maintained below the equipment limit value. However, if the higher detected temperature of the furnace temperature and exhaust gas temperature is input to the gas temperature controller via the high selector, both the furnace temperature and exhaust gas temperature can be reliably maintained below the equipment limit value. Therefore, it is preferable.
【００１０】0010
【実施例】以下図１によりこの発明の一実施例を説明す
る。図中、図２と同一部分には、図２と同一符号を付し
、その詳細な説明は省略する。２１は炉体１の炉頂部１
ａに設けた熱電対で、炉頂部１ａ付近の炉内ガス温度を
検出するためのものである。また２２は炉体１の排ガス
口１ｂ部に設けた排ガス温度検出用の熱電対である。
これら各熱電対２１，２２の出力側は、ハイセレクタ２
３を介してガス温度調節器２４の入力部に接続されてい
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the figure, the same parts as in FIG. 2 are given the same reference numerals as in FIG. 2, and detailed explanation thereof will be omitted. 21 is the furnace top 1 of the furnace body 1
This is a thermocouple installed at the top of the furnace 1a to detect the temperature of the gas in the furnace near the furnace top 1a. Further, 22 is a thermocouple for detecting exhaust gas temperature provided at the exhaust gas port 1b of the furnace body 1. The output side of each of these thermocouples 21 and 22 is connected to the high selector 2.
3 to the input of the gas temperature regulator 24.
【００１１】このガス温度調節器２４の目標値設定部の
入力端子には、湯温調節器４の出力部が接続され、湯温
調節器４の出力信号がガス温度調節器２４の目標値とし
て与えられるようになつている。またガス温度調節器２
４の出力部は、燃料流量調節器１３の設定部の入力端子
に接続されるとともに、空燃比設定器１９を介して空気
流量調節器１７の設定部の入力端子に接続されており、
これによつてガス温度調節器２４の出力信号が空燃比制
御装置７の目標値として与えられるようになつている。The output section of the hot water temperature regulator 4 is connected to the input terminal of the target value setting section of the gas temperature regulator 24, and the output signal of the hot water temperature regulator 4 is used as the target value of the gas temperature regulator 24. It's starting to be given. Also, gas temperature controller 2
The output section of 4 is connected to the input terminal of the setting section of the fuel flow rate regulator 13, and is also connected to the input terminal of the setting section of the air flow rate regulator 17 via the air-fuel ratio setting device 19,
As a result, the output signal of the gas temperature regulator 24 is given as a target value to the air-fuel ratio control device 7.
【００１２】上記構成の装置においては、熱電対３によ
つて検出された湯温Ｔ１ は、湯温設定器５の設定湯温
Ｔ０ と比較され、両湯温の偏差に所定のＰＩＤ演算を
施した出力信号Ｔ２ が、ガス温度調節器２４にガス温
度目標値として入力される。熱電対２１および２２によ
る検出温度のうち高い方の温度がハイセレクタ２３によ
り選択され、ガス温度調節器２４に制御量として入力さ
れるので、ガス温度調節器２４は、この検出温度と前記
ガス温度目標値Ｔ２ との偏差に所定のＰＩＤ演算を施
した出力信号Ｑを、空燃比制御装置７に目標値として与
える。In the apparatus configured as described above, the hot water temperature T1 detected by the thermocouple 3 is compared with the set hot water temperature T0 of the hot water temperature setting device 5, and a predetermined PID calculation is performed on the difference between the two hot water temperatures. The output signal T2 is inputted to the gas temperature regulator 24 as a gas temperature target value. The higher temperature of the temperatures detected by the thermocouples 21 and 22 is selected by the high selector 23 and inputted to the gas temperature regulator 24 as a control amount. An output signal Q obtained by performing a predetermined PID calculation on the deviation from the target value T2 is given to the air-fuel ratio control device 7 as a target value.
【００１３】空燃比制御装置７はこの目標値のもとで燃
料および空気の流量を制御してバ−ナ６の燃焼量を制御
し、バ−ナ６の燃焼量の変動は、炉温および排ガス温度
の変動として迅速に熱電対２１および２２により検出さ
れてガス温度調節器２４にフイ−ドバツクされ、ガス温
度調節器２４の出力信号Ｑを減少させ、湯温のオ−バ−
シユ−トを防止する。また溶湯２の温度制御は、ガス温
度調節器２４によつて炉温と排ガス温度の高い方の温度
を介しておこなわれるので、炉温および排ガス温度は、
いずれも装置限界値に達することはなく、緊急燃焼量カ
ツト装置の作動による湯温制御不良をおこすこともない
。The air-fuel ratio control device 7 controls the amount of combustion of the burner 6 by controlling the flow rates of fuel and air based on this target value, and fluctuations in the amount of combustion of the burner 6 are determined by the furnace temperature and the amount of combustion of the burner 6. Fluctuations in the exhaust gas temperature are quickly detected by the thermocouples 21 and 22 and fed back to the gas temperature regulator 24, reducing the output signal Q of the gas temperature regulator 24 and preventing the hot water temperature from overshooting.
Prevents shoots. Furthermore, the temperature of the molten metal 2 is controlled by the gas temperature controller 24 using the higher of the furnace temperature and the exhaust gas temperature, so the furnace temperature and the exhaust gas temperature are
In either case, the device limit value is not reached, and hot water temperature control failure due to the operation of the emergency combustion amount cut device does not occur.
【００１４】この発明は上記実施例に限定されるもので
はなく、たとえば上記実施例では炉温および排ガス温度
のうち高い方の検出温度をガス温度調節器２４の制御量
としたが、炉の特性等に応じて、ハイセレクタ２３を省
略して炉温または排ガス温度のいずれか一方のみをガス
温度調節器２４の制御量としてもよい。また空燃比制御
装置７としては、たとえばクロスリミツト燃料制御方式
など、各種の制御方式の装置を用いることができる。The present invention is not limited to the embodiment described above; for example, in the embodiment described above, the higher detected temperature of the furnace temperature and the exhaust gas temperature is used as the control variable of the gas temperature controller 24; Depending on the situation, the high selector 23 may be omitted and only either the furnace temperature or the exhaust gas temperature may be used as the control amount of the gas temperature regulator 24. Furthermore, as the air-fuel ratio control device 7, devices using various control methods, such as a cross-limit fuel control method, can be used.
【００１５】[0015]
【発明の効果】以上説明したようにこの発明によれば、
湯温のオ−バ−シユ−トが防止されるとともに、炉内ガ
スおよび排ガスの過熱が防止され、湯温制御精度が向上
し、溶湯の酸化損失や炉体耐火物の消耗を抑制できる。[Effects of the Invention] As explained above, according to the present invention,
Overshoot of the hot water temperature is prevented, overheating of the furnace gas and exhaust gas is prevented, the hot water temperature control accuracy is improved, and oxidation loss of the molten metal and consumption of the furnace refractories can be suppressed.
【図１】この発明の一実施例を示すアルミニウム溶解炉
の湯温制御装置の制御系統図である。FIG. 1 is a control system diagram of a hot water temperature control device for an aluminum melting furnace showing an embodiment of the present invention.
【図２】従来のアルミニウム溶解炉の湯温制御装置の一
例を示す制御系統図である。FIG. 2 is a control system diagram showing an example of a conventional hot water temperature control device for an aluminum melting furnace.
１ 炉体 １ａ 炉頂部 １ｂ 排ガス口 ２ 溶湯 ３ 熱電対 ４ 湯温調節器 ５ 湯温設定器 ６ バ−ナ ７ 空燃比制御装置 １１ 燃料配管 １３ 燃料流量調節器 １５ 空気配管 １７ 空気流量調節器 １９ 空燃比設定器 ２１ 熱電対 ２２ 熱電対 ２３ ハイセレクタ ２４ ガス温度調節器 1 Furnace body 1a Furnace top 1b Exhaust gas port 2 Molten metal 3 Thermocouple 4 Water temperature regulator 5 Water temperature setting device 6 Burner 7 Air-fuel ratio control device 11 Fuel piping 13 Fuel flow regulator 15 Air piping 17 Air flow regulator 19 Air fuel ratio setting device 21 Thermocouple 22 Thermocouple 23 High selector 24 Gas temperature controller
Claims (2)
を制御量とする流量調節器をそなえた空燃比制御装置と
、湯温を制御量とする湯温調節器との間に、炉温または
排ガス温度を制御量とするガス温度調節器を接続し、前
記湯温調節器の出力信号を前記ガス温度調節器の目標値
として与えるとともに、前記ガス温度調節器の出力信号
を前記空燃比制御装置の目標値として与えるようにした
ことを特徴とするアルミニウム溶解炉の湯温制御装置。Claim 1: Between an air-fuel ratio control device including a flow rate regulator that uses the flow rate of fuel and air supplied to the burner as a controlled variable, and a hot water temperature regulator that uses the hot water temperature as a controlled variable, A gas temperature regulator whose control variable is the furnace temperature or exhaust gas temperature is connected, and the output signal of the hot water temperature regulator is given as the target value of the gas temperature regulator, and the output signal of the gas temperature regulator is applied to the air temperature regulator. A hot water temperature control device for an aluminum melting furnace, characterized in that the temperature is given as a target value of a fuel ratio control device.
セレクタを介してガス温度調節器の入力部に接続され、
炉温と排ガス温度のうち高い方の検出温度がガス温度調
節器に制御量として入力されるようになつている請求項
１記載のアルミニウム溶解炉の湯温制御装置。2. A furnace temperature detector and an exhaust gas temperature detector are connected to an input part of a gas temperature controller via a high selector,
2. The hot water temperature control device for an aluminum melting furnace according to claim 1, wherein the higher detected temperature of the furnace temperature and the exhaust gas temperature is inputted to the gas temperature controller as a control variable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10861791A JPH04314835A (en) | 1991-04-11 | 1991-04-11 | Melt temperature controlling device for aluminum melting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10861791A JPH04314835A (en) | 1991-04-11 | 1991-04-11 | Melt temperature controlling device for aluminum melting furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04314835A true JPH04314835A (en) | 1992-11-06 |
Family
ID=14489340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10861791A Pending JPH04314835A (en) | 1991-04-11 | 1991-04-11 | Melt temperature controlling device for aluminum melting furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04314835A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2832732A1 (en) * | 2001-11-29 | 2003-05-30 | Air Liquide | Aluminum melting process controlled as a function of the formation of aluminum oxides, deduced by monitoring the variations in carbon monoxide concentration and the temperature of the fumes leaving the furnace |
| WO2004083469A1 (en) * | 2003-03-21 | 2004-09-30 | L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process for melting an aluminum charge containing organic material |
| ES2326935A1 (en) * | 2005-05-18 | 2009-10-21 | Al Air Liquide España, S.A. | Procedure for the fusion of metals. (Machine-translation by Google Translate, not legally binding) |
-
1991
- 1991-04-11 JP JP10861791A patent/JPH04314835A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2832732A1 (en) * | 2001-11-29 | 2003-05-30 | Air Liquide | Aluminum melting process controlled as a function of the formation of aluminum oxides, deduced by monitoring the variations in carbon monoxide concentration and the temperature of the fumes leaving the furnace |
| WO2003056044A1 (en) * | 2001-11-29 | 2003-07-10 | L'air Liquide, Societe Anonyme A Directoire Et Co Nseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude | Aluminium melting method using analysis of fumes coming from the furnace |
| JP2005513272A (en) * | 2001-11-29 | 2005-05-12 | レール・リキード−ソシエテ・アノニム・ア・ディレクトワール・エ・コンセイユ・ドゥ・スールベイランス・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード | Aluminum melting method using analysis of flue gas exiting furnace |
| WO2004083469A1 (en) * | 2003-03-21 | 2004-09-30 | L'air Liquide, Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process for melting an aluminum charge containing organic material |
| ES2326935A1 (en) * | 2005-05-18 | 2009-10-21 | Al Air Liquide España, S.A. | Procedure for the fusion of metals. (Machine-translation by Google Translate, not legally binding) |
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