JPH05257544A - Combustion control device for mixed firing furnace - Google Patents
Combustion control device for mixed firing furnaceInfo
- Publication number
- JPH05257544A JPH05257544A JP5778292A JP5778292A JPH05257544A JP H05257544 A JPH05257544 A JP H05257544A JP 5778292 A JP5778292 A JP 5778292A JP 5778292 A JP5778292 A JP 5778292A JP H05257544 A JPH05257544 A JP H05257544A
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- Prior art keywords
- fuel
- flow rate
- furnace
- value
- ratio
- 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.)
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- Control Of Non-Electrical Variables (AREA)
- Control Of Temperature (AREA)
- Feeding And Controlling Fuel (AREA)
- Flow Control (AREA)
Abstract
(57)【要約】
【構成】炉温の測定値と設定値の偏差を０とするような
燃料流量配分調節計１７の出力信号を主燃料流量配分値
とし、この値とトータル燃料流量調節計５の出力値から
燃料流量調節計（主燃料用）７、燃料流量調節計（副燃
料用）８の流量設定値を決めて最終制御量である炉温を
炉温調節計４で制御し混焼炉の運転を行う。
【効果】炉温の測定値と設定値の偏差値により経済的効
率と炉の安定燃焼を考慮して自動的に燃料流量配分の割
合が調整された混焼炉の燃焼制御がおこなわれる。
(57) [Summary] [Structure] The output signal of the fuel flow rate distribution controller 17 that sets the deviation between the measured value of the furnace temperature and the set value to 0 is taken as the main fuel flow rate distribution value, and this value and the total fuel flow rate controller are set. From the output value of 5, the fuel flow rate controller (for the main fuel) 7 and the fuel flow rate controller (for the sub fuel) 8 are set to the flow rate set values, and the furnace temperature, which is the final control amount, is controlled by the furnace temperature controller 4 and mixed combustion Operate the furnace. [Effect] Combustion control of a co-firing furnace is performed in which the ratio of the fuel flow rate distribution is automatically adjusted in consideration of economic efficiency and stable combustion of the furnace by the deviation of the measured value and the set value of the furnace temperature.
Description
【０００１】[0001]
【産業上の利用分野】この発明は混焼炉の燃焼制御装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control device for a mixed firing furnace.
【０００２】[0002]
【従来の技術】二種以上の燃料を混焼するボイラー、加
熱炉などの炉においては、最終制御量（ボイラーの場合
は蒸気圧力、加熱炉の場合は温度）の制御にあたり、各
燃料の流量の割合が予め設定された通りとなるように各
燃料の供給を制御することが行われてる。2. Description of the Related Art In a furnace such as a boiler or a heating furnace that co-fires two or more types of fuels, the flow rate of each fuel is controlled when controlling the final control amount (steam pressure in the case of a boiler, temperature in the case of a heating furnace). The supply of each fuel is controlled so that the ratio is as set in advance.
【０００３】従来技術では、特許公報 昭58−21171号に
あるとおり各燃料の流量の割合が常に固定的に設定され
るような制御装置であり、この割合を調整する必要が発
生した場合は、その都度オペレータによる設定変更作業
が必要であった。In the prior art, as disclosed in Japanese Patent Publication No. 58-21171, the control device is such that the ratio of the flow rate of each fuel is always fixed. If it is necessary to adjust this ratio, Each time, the operator had to change the settings.
【０００４】[0004]
【発明が解決しようとする課題】二種以上の燃料を混焼
するボイラー、加熱炉などの炉において使用される燃料
は、例えば屑炭の様な質は悪いが（比較的燃焼しづらく
単位熱量が小さいか、または単位熱量が不均一な燃料）
安価な主燃料と、例えばＬＰＧのような質は良いが（燃
焼しやすく単位熱量が大きく均一な燃料）高価な副燃料
を混焼する場合が多い。この場合炉の安定な運転を考え
れば、単位熱量が大きく均一な副燃料を多くして運転す
ればよいが、経済的な効率を考慮すれば、安価な主燃料
を多く、高価な副燃料を少なく運転を行った方が効率が
よい。Fuel used in furnaces such as boilers and heating furnaces that co-firing two or more types of fuels is of poor quality such as scrap coal (comparatively difficult to burn and has a unit calorific value). Small or non-uniform fuel quantity)
In many cases, an inexpensive main fuel is mixed with an inexpensive auxiliary fuel, which has a good quality such as LPG (a fuel that is easy to burn and has a large unit heat amount and is uniform), and an expensive auxiliary fuel. In this case, considering stable operation of the furnace, it is sufficient to operate with a large amount of unitary heat and a uniform amount of auxiliary fuel. However, considering economical efficiency, there are many inexpensive main fuels and expensive auxiliary fuels. It is more efficient to drive less.
【０００５】従ってオペレータは、炉の燃焼状態や燃料
の質を見て各燃料の流量の割合を必要に応じて設定変更
する作業が必要となり、煩わしさが残った。本発明は、
かかる欠点に鑑みてなされたものであり、その目的とす
るところは、二種以上の燃料を混焼するボイラー，加熱
炉などの炉において経済的な効率を考慮しつつ安定に炉
の燃焼運転を行なえるよう、各燃料の流量の割合を自動
的に微調整する燃焼制御装置を提供することにある。Therefore, the operator needs to change the ratio of the flow rate of each fuel as necessary, depending on the combustion state of the furnace and the quality of the fuel, which is troublesome. The present invention is
This has been made in view of such drawbacks, and the purpose thereof is to stably perform combustion operation of a furnace in consideration of economical efficiency in a furnace such as a boiler or a heating furnace that co-fires two or more kinds of fuels. Therefore, it is an object of the present invention to provide a combustion control device that automatically finely adjusts the flow rate ratio of each fuel.
【０００６】[0006]
【課題を解決するための手段】本発明は上記目的を達成
するため、最終制御量の、例えば炉温の測定値と設定値
との偏差を演算して、この偏差を０となるようなＰＩＤ
演算出力を行う燃料流量割合調節計を設け、この調節計
の出力、すなわち燃料の流量割合値Ｒ′の値により各燃
料の流量を制御する様にしたものである。In order to achieve the above object, the present invention calculates the deviation between the measured value and the set value of the final controlled variable, for example, the furnace temperature, and determines the deviation to be 0.
A fuel flow rate ratio controller for performing arithmetic output is provided, and the flow rate of each fuel is controlled by the output of this controller, that is, the value of the fuel flow rate ratio value R '.
【０００７】このとき上記偏差がある一定値以内の時
に、はじめて燃料流量割合調節計が制御演算を行う様に
する為の切り替えスイッチと、炉温がある一定値以上の
場合に制御演算を行う様にする為の切り替えスイッチを
もうけ、これらのスイッチが働いていない場合には、前
回の各燃料の流量割合値Ｒ′の値をホールドさせるよう
にすることにより、炉の立ち上げ立ち下げ時及び炉温の
設定値を変更した場合には、本機能が働かないように
し、調整機能が必要なときにだけ調整動作を行う様にし
た。At this time, when the deviation is within a certain value, a changeover switch for causing the fuel flow rate controller to perform the control operation for the first time, and when the furnace temperature exceeds a certain value, the control operation is performed. When these switches are not working, by holding the changeover switches for holding the previous flow rate ratio value R'of each fuel, the start-up and shutdown of the furnace and the furnace This function does not work when the set temperature value is changed, and the adjustment operation is performed only when the adjustment function is required.
【０００８】[0008]
【作用】主燃料と副燃料により混焼運転させる場合、主
燃料の単位発熱量が、低下すると炉温が低下し炉温の測
定値と設定値の差（偏差量）がマイナス値となる。偏差
量がマイナス側になったときに主燃料の占める割合を小
さく、副燃料の占める割合を大きくしてやる様に燃料の
流量の割合を変えれば、燃料のトータル発生熱量は大き
くなり炉温が上昇し、やがて測定値は設定値の偏差量が
プラス値となる。偏差量がプラス側になったときに燃料
量のうちの主燃料の占める割合を大きく、副燃料の占め
る割合を小さくしてやる様に変えれば、燃料のトータル
発生熱量は小さくなり炉温が下がり、やがて測定値は設
定値に一致する。In the co-firing operation with the main fuel and the auxiliary fuel, when the unit calorific value of the main fuel decreases, the furnace temperature decreases and the difference (deviation amount) between the measured value and the set value of the furnace temperature becomes a negative value. If the ratio of the flow rate of the fuel is changed so that the ratio of the main fuel is small and the ratio of the auxiliary fuel is large when the deviation amount becomes negative, the total calorific value of the fuel increases and the furnace temperature rises. Eventually, the measured value becomes the plus value of the deviation of the set value. If the ratio of the main fuel to the fuel amount is large and the ratio of the auxiliary fuel is small when the deviation amount is on the positive side, the total calorific value of the fuel will be small and the furnace temperature will decrease, eventually. The measured value matches the set value.
【０００９】これらの作用により、主燃料の単位発熱量
が変動しても安定して炉の運転を維持することが出来
る。Due to these effects, the operation of the furnace can be maintained stably even if the unit calorific value of the main fuel fluctuates.
【００１０】[0010]
【実施例】図１は、従来の制御装置のブロック線図を示
す。１は混焼の温度を検出して、これに対応する値を持
つ電気信号を発生する温度変換器。２及び３は燃焼炉に
供給される２種類の燃料の流量をそれぞれ検出して、こ
れに対応する値を持つ電気信号を発生する第一および第
二の流量変換器。４は温度調節計で温度変換器１からの
信号と設定温度信号（Ｔ・ＳＶ）とを入力して、両信号
に差があるとき、炉温が設定温度に達するにはどれだけ
の燃料量が必要であるかを決定し、これに応じた電気信
号を発する。そして６は、第一および第二の流量変換器
からの信号ｆ1，ｆ2を加算演算し、トータル燃料流量を
演算する加算器。５は、この加算器から出力されるトー
タル燃料流量信号を入力信号とし必要トータル燃料流量
を演算するトータル燃料流量調節計。ここで炉温を、設
定温度に一致させるに必要なトータル燃料流量が決定さ
れる。トータル燃料流量調節計からの出力信号は、第
一，第二の掛算器９及び１０に与えられる。１２（Ｒ）
は、トータル燃料流量に対する第一の燃料流量の割合を
設定する設定器であり、０〜Ｒ〜１の範囲であらかじめ
設定されており、このＲに対応する信号が第一の掛算器
９に与えられる。また第二の掛算器１０には関数変換器
１１によりトータル燃料流量に対する第二の燃料流量の
割合（１−Ｒ）が演算されこれに対応する信号が与えら
れる。第一，第二の掛算器では、前記トータル燃料流量
信号と第一，第二の燃料流量の割合信号を掛算され各燃
料量が決定され、これらの信号が７，第一燃料流量調節
計及び８，第二燃料流量調節計の設定値として入力され
る。７，第一燃料流量調節計及び８，第二燃料流量調節
計はこの設定値と、第一および第二の流量変換器からの
流量信号から第一及び第二の燃料の流路に挿入された第
一および第二の燃料調節弁１３，１４の開度を制御す
る。DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a block diagram of a conventional control device. 1 is a temperature converter that detects the temperature of mixed combustion and generates an electric signal having a value corresponding to this. Reference numerals 2 and 3 are first and second flow rate converters that detect the flow rates of the two types of fuel supplied to the combustion furnace and generate an electric signal having a value corresponding to the detected flow rates. Numeral 4 is a temperature controller, which inputs the signal from the temperature converter 1 and the set temperature signal (T / SV), and when there is a difference between the two signals, how much fuel is required for the furnace temperature to reach the set temperature Is required, and an electric signal corresponding to this is emitted. Reference numeral 6 denotes an adder that performs addition calculation of the signals f 1 and f 2 from the first and second flow rate converters to calculate the total fuel flow rate. Reference numeral 5 is a total fuel flow rate controller that calculates the required total fuel flow rate by using the total fuel flow rate signal output from this adder as an input signal. Here, the total fuel flow rate required to match the furnace temperature with the set temperature is determined. The output signal from the total fuel flow rate controller is given to the first and second multipliers 9 and 10. 12 (R)
Is a setter for setting the ratio of the first fuel flow rate to the total fuel flow rate, and is preset in the range of 0 to R to 1. A signal corresponding to this R is given to the first multiplier 9. Be done. The function converter 11 calculates the ratio (1-R) of the second fuel flow rate to the total fuel flow rate, and the second multiplier 10 is provided with a signal corresponding thereto. In the first and second multipliers, the total fuel flow rate signal and the ratio signal of the first and second fuel flow rates are multiplied to determine each fuel amount, and these signals are 7, the first fuel flow rate controller and 8. Input as the set value of the second fuel flow rate controller. 7, the first fuel flow rate controller and 8, the second fuel flow rate controller are inserted into the flow paths of the first and second fuels from this set value and the flow rate signals from the first and second flow rate converters. The opening degree of the first and second fuel control valves 13 and 14 is controlled.
【００１１】以上によって所定の炉温を保つ様に必要な
燃料量を設定どおりの割合をもって第一，第二の燃料を
炉に供給することが出来るようになる。As described above, it becomes possible to supply the first and second fuels to the furnace at a preset ratio of the amount of fuel required to maintain the predetermined furnace temperature.
【００１２】ところでこの種の制御装置に用いられてい
る燃料流量の割合設定は、図１に示す構成からも明らか
なように２種の燃料流量の割合は、固定でありオペレー
タが炉の状態，燃料の状態を確認して適当と思われる割
合を設定していた。使用する複数の燃料が、いずれも燃
焼しやすく、単位発熱量が一定であるような燃料であれ
ば、何ら問題はないが、使用される燃料が、例えば、屑
炭の様な質は悪いが、（比較的燃焼しづらく単位熱量が
小さいか、または熱量が不均一な燃料）安価な主燃料
と、例えばＬＰＧの様な質は良いが（燃焼しやすく熱量
が大きく均一な燃料）高価な副燃料を混焼する場合燃料
流量の割合が、固定ではとても使いずらい物になる。経
済的な効率を考慮すれば、安価な主燃料を多く、高価な
副燃料を少なく運転を行ないたいが炉の燃焼の安定性は
悪くなる。逆に炉の燃焼の安定性考慮すれば、高価な副
燃料を多く使うこととなり経済的な効率が悪くなる。By the way, in setting the fuel flow rate ratio used in this type of control device, as is apparent from the configuration shown in FIG. 1, the two types of fuel flow rate ratios are fixed and the operator is in a state of the furnace. I checked the fuel condition and set a ratio that seems appropriate. There is no problem if the multiple fuels used are those that burn easily and the unit calorific value is constant, but the quality of the fuel used is, for example, waste coal, but the quality is poor. , (A fuel that is relatively hard to burn and has a small unit calorific value or a non-uniform calorific value), and an inexpensive main fuel, and a good quality such as LPG (a fuel that is easy to burn and has a large calorific value and uniform), an expensive secondary fuel When the fuel is mixed and burned, the fixed fuel flow rate makes it very difficult to use. Considering economical efficiency, it is desirable to operate with a large amount of inexpensive main fuel and a small amount of expensive auxiliary fuel, but the combustion stability of the furnace deteriorates. On the other hand, considering the combustion stability of the furnace, a large amount of expensive auxiliary fuel is used, resulting in poor economic efficiency.
【００１３】従ってオペレータは、炉の燃料状態を見て
各燃料の流量の割合を必要に応じて設定変更する必要が
あり煩わしさが生じる。本発明は、かかる欠点に鑑みて
なされたものであり、その目的とするところは、二種以
上の燃料を混焼するボイラー，加熱炉などの炉において
経済的な効率を考慮しつつ安定に炉の燃焼運転を行える
よう、各燃料の流量の割合を自動的に微調整する燃焼制
御装置を提供することにある。Therefore, the operator needs to change the ratio of the flow rates of the respective fuels as necessary by observing the fuel state of the furnace, which is troublesome. The present invention has been made in view of the above drawbacks, and an object of the present invention is to stably stabilize a furnace in consideration of economical efficiency in a furnace such as a boiler or a heating furnace that co-fires two or more kinds of fuels. An object of the present invention is to provide a combustion control device that automatically finely adjusts the flow rate ratio of each fuel so that combustion operation can be performed.
【００１４】図２はこの発明の実施例を示す。尚、図１
と同じ符号を附した部分は同一又は対応部分を示す。図
の実施例ではトータル燃料流量調節計に温度調節計およ
び加算器からの信号を受けて設定温度に対するトータル
燃料流量を決定する方式は図１の構成と同じであるが２
種類の燃料流量の割合値は、固定値ではなく燃料流量配
分調節計１７より演算され出力された値が用いられる。
燃料流量配分調節計１７は温度変換器１からの信号と設
定温度信号（ＴＳＶ）との差を引算器１５で偏差を演算
してこれを入力値とし、この値がゼロ（炉温が設定温度
と同じ状態）となるように制御するようにする。つまり
炉温が設定温度より高くなると主燃料の単位熱量が上が
ったことと見なし、主燃料の流量割合を高めてもよいと
判断し燃料流量配分調節計１７の出力値は、大きくなる
方向へ、逆に炉温が設定温度より低くなると主燃料の単
位熱量が下がったことと見なし、副燃料の流量割合を高
めなければならないと判断し燃料流量配分調節計１７の
出力値は、小さくなる方向へ、制御する事となる。この
燃料流量配分調節計１７の出力値Ｒ′に対応する信号が
第一の掛算器９に与えられる。また第二の掛算器１０に
は１１に関数変換器によりトータル燃料流量に対する第
二の燃料流量の割合（１−Ｒ′）が演算されこれに対応
する信号が与えられる。第一，第二の掛算器では、前記
トータル燃料流量信号と第一，第二の燃料流量の割合信
号を掛算され各燃料量が決定され、これらの信号が、第
一燃料流量調節計７及び第二燃料流量調節計８の設定値
として入力される。第一燃料流量調節計７及び第二燃料
流量調節計８の設定値と、第一および第二の流量変換器
からの流量信号から第一および第二の燃料の流路に挿入
された第一および第二燃料調節弁１３，１４の開度を制
御する。FIG. 2 shows an embodiment of the present invention. Incidentally, FIG.
The parts given the same reference numerals as in the above indicate the same or corresponding parts. In the embodiment shown in the figure, the method of receiving the signals from the temperature controller and the adder to the total fuel flow rate controller to determine the total fuel flow rate with respect to the set temperature is the same as the configuration of FIG.
The ratio value of the fuel flow rate of each type is not a fixed value, but a value calculated and output from the fuel flow rate distribution controller 17 is used.
In the fuel flow rate distribution controller 17, the difference between the signal from the temperature converter 1 and the set temperature signal (TSV) is calculated by the subtractor 15 and the deviation is used as an input value. This value is zero (the furnace temperature is set). Control so that the temperature is the same). That is, when the furnace temperature becomes higher than the set temperature, it is considered that the unit heat quantity of the main fuel has increased, and it is determined that the flow rate ratio of the main fuel may be increased, and the output value of the fuel flow distribution controller 17 increases in the direction of increasing. On the contrary, when the furnace temperature becomes lower than the set temperature, it is considered that the unit heat quantity of the main fuel has decreased, and it is judged that the flow rate ratio of the auxiliary fuel must be increased, and the output value of the fuel flow rate distribution controller 17 decreases , Will be controlled. A signal corresponding to the output value R ′ of the fuel flow rate distribution controller 17 is given to the first multiplier 9. Further, in the second multiplier 10, the ratio (1-R ') of the second fuel flow rate to the total fuel flow rate is calculated by the function converter in 11 and a signal corresponding thereto is given. In the first and second multipliers, the total fuel flow rate signal and the ratio signal of the first and second fuel flow rates are multiplied to determine each fuel amount, and these signals are used as the first fuel flow rate controller 7 and It is input as a set value of the second fuel flow rate controller 8. From the set values of the first fuel flow rate controller 7 and the second fuel flow rate controller 8 and the flow rate signals from the first and second flow rate converters, the first inserted into the flow paths of the first and second fuels. And the opening degree of the second fuel control valves 13 and 14 is controlled.
【００１５】上下限検出器２２は、燃料流量の割合を微
調整する範囲を決定するためにあり、温度変換器１から
の信号と設定温度信号（Ｔ・ＳＶ）との偏差がある一定
値以内に入っていることを検出して、切り替え器１９を
ＯＮ側にセットするようにする。The upper and lower limit detector 22 is for determining the range for finely adjusting the ratio of the fuel flow rate, and there is a deviation between the signal from the temperature converter 1 and the set temperature signal (T / SV) within a certain fixed value. It is detected that the switch is on, and the switch 19 is set to the ON side.
【００１６】偏差がある一定値以内に入らない場合は、
燃料流量の割合を微調整する範囲を越えたと判断し、切
り替え器１９をＯＦＦ側にセットするようにする。この
機能により、偏差が十分大きければ、燃料流量の割合を
微調整せず二種の燃料の流量割合を現状のままに保ち温
度調節計４の制御機能によりトータル燃料流量を操作す
る様制御する。トータル燃料流量を操作することにより
炉温が変わり偏差がある一定値以内に入ってから燃料流
量の割合を微調整する様制御することとなる。偏差があ
る一定値以内に入らず切り替え器１９がＯＦＦ側にセッ
トされている間燃料流量配分調節計１７の積分演算は、
リセットし再度切り替え器１９がＯＮ側に切り替わった
ときに切り替わる直前の値から制御を開始させるための
最終選択燃料割合値１８をフィードバックさせるように
する。これにより切り替え器１９がＯＮ／ＯＦＦしても
燃料流量割合がステップ状に変化せずスムーズに切り替
えることができる。If the deviation does not fall within a certain value,
It is judged that the ratio of the fuel flow rate has exceeded the range for fine adjustment, and the switch 19 is set to the OFF side. With this function, if the deviation is sufficiently large, the ratio of the fuel flow rates is not finely adjusted, and the flow rate ratios of the two types of fuel are maintained as they are, and the total fuel flow rate is controlled by the control function of the temperature controller 4. By controlling the total fuel flow rate, the furnace temperature changes, and after the deviation falls within a certain value, control is performed so as to finely adjust the fuel flow rate. While the deviation does not fall within a certain value and the switch 19 is set to the OFF side, the integral calculation of the fuel flow distribution controller 17 is
When the switch 19 is reset and switched to the ON side again, the final selected fuel ratio value 18 for starting the control is fed back from the value immediately before the switching. As a result, even if the switch 19 is turned ON / OFF, the fuel flow rate does not change stepwise and can be switched smoothly.
【００１７】下限検出器２３は、炉の立ち上げ時など炉
温が低いときには燃料流量の微調整を行なわず、初期燃
料流量割合値１２をセットするためにあり、温度変換器
１からの信号がある一定値以上であることを検出して、
切り替え器２１をＯＮ側にセットするようにする。The lower limit detector 23 is provided for setting the initial fuel flow rate ratio value 12 without finely adjusting the fuel flow rate when the furnace temperature is low such as when the furnace is started up. Detecting that it is above a certain value,
The switch 21 is set to the ON side.
【００１８】燃料流量割合がステップ状に変化せずスム
ーズに切り替える機能に関しては、切り替え器１９の場
合と同様である。初期燃料流量割合値１２はあらかじめ
オペレータにより設定される値であり、燃料流量割合を
微調整するための基準値となる。上下限リミッタ２０
は、燃料流量配分調節計１７の出力値が常に制御上好ま
しいある一定の範囲内にあるようにするためのものであ
り、燃料の割合が、どちらか一方に片寄り過ぎないよう
にする目的で用いられる。ここで、主燃料と副燃料の流
量の割合がどの様な割合であればよいのかは、炉の経済
効率，燃料の単位発熱量などから割りだすことができ
る。また、燃料流量の微調整をどの温度以上で行うか、
炉温と炉温設定値の偏差で何度以内の時微調整を行う
か、に関しても炉の目的，使用燃料から決定することが
できる。The function of smoothly switching the fuel flow rate ratio without changing stepwise is the same as that of the switcher 19. The initial fuel flow rate ratio value 12 is a value set in advance by the operator and serves as a reference value for finely adjusting the fuel flow rate ratio. Upper and lower limit limiter 20
Is for ensuring that the output value of the fuel flow rate distribution controller 17 is always within a certain range that is preferable for control, and for the purpose of preventing the fuel ratio from deviating to either one side too much. Used. Here, what kind of ratio the flow rates of the main fuel and the auxiliary fuel should be, can be determined from the economic efficiency of the furnace, the unit calorific value of the fuel, and the like. In addition, at what temperature or more should the fine adjustment of the fuel flow rate be performed,
The number of times of fine adjustment based on the deviation between the furnace temperature and the set value of the furnace temperature can be determined from the purpose of the furnace and the fuel used.
【００１９】[0019]
【発明の効果】以上のようにして燃料流量配分調節計の
制御出力で、主燃料と副燃料の流量配分を制御すること
により、これがフィードバックされ良好なる燃焼状態が
維持されることとなる。上述した説明から明らかなよう
に本発明によれば、炉温の温度を所望の温度に保持し
得、複数の燃料の流量配分を炉温の測定値と設定温度の
偏差により自動調整するものであるので固定配分率方式
に比べて副燃料の過使用がなく、その分、省エネルギー
が実現される。また炉の燃焼状態や主燃料の質を見て、
その都度オペレータによる流量配分率の調整変更を不要
のものとした。As described above, by controlling the flow rate distribution of the main fuel and the auxiliary fuel by the control output of the fuel flow rate distribution controller, this is fed back and a good combustion state is maintained. As is clear from the above description, according to the present invention, the temperature of the furnace temperature can be maintained at a desired temperature, and the flow rate distribution of a plurality of fuels is automatically adjusted by the deviation between the measured value of the furnace temperature and the set temperature. Because of this, compared to the fixed allocation ratio method, there is less overuse of secondary fuel, and energy saving is realized accordingly. In addition, looking at the combustion state of the furnace and the quality of the main fuel,
It is no longer necessary for the operator to change the flow rate distribution rate each time.
【図１】複数の燃料を混焼する混焼炉における従来の燃
焼制御装置のブロック線図である。FIG. 1 is a block diagram of a conventional combustion control device in a co-firing furnace for co-firing a plurality of fuels.
【図２】複数の燃料を混焼する混焼炉における本発明に
よる燃焼制御装置のブロック線図である。FIG. 2 is a block diagram of a combustion control device according to the present invention in a co-firing furnace for co-firing a plurality of fuels.
１…温度変換器、２…流量変換器（主燃料用）、３…流
量変換器（副燃料用）、４…炉温温度調節計、５…トー
タル燃料流量調節計、６…加算器、７…燃料流量調節計
（主燃料用）、８…燃料流量調節計（副燃料用）、９，
１０…掛算器、１１…関数変換器、１２…主燃料流量割
合設定値、１３…燃料流量調節弁（主燃料用）、１４…
燃料流量調節弁（副燃料用）、１５…引算器、１７…燃
料流量配分調節計、１８…最終選択燃料割合値、１９，
２１…切り替え器、２０…上下限リミッタ、２２…上下
限検出器、２３…下限検出器。DESCRIPTION OF SYMBOLS 1 ... Temperature converter, 2 ... Flow rate converter (for main fuel), 3 ... Flow rate converter (for sub fuel), 4 ... Reactor temperature controller, 5 ... Total fuel flow controller, 6 ... Adder, 7 ... Fuel flow rate controller (for main fuel), 8 ... Fuel flow rate controller (for auxiliary fuel), 9,
10 ... Multiplier, 11 ... Function converter, 12 ... Main fuel flow rate ratio set value, 13 ... Fuel flow rate control valve (for main fuel), 14 ...
Fuel flow rate control valve (for secondary fuel), 15 ... Subtractor, 17 ... Fuel flow rate distribution controller, 18 ... Final selected fuel ratio value, 19,
21 ... Switching device, 20 ... Upper / lower limit limiter, 22 ... Upper / lower limit detector, 23 ... Lower limit detector.
Claims (1)
て、前記第一及び第二の各燃料の量を検出する第一及び
第二の流量変換器と、前記流量変換器の出力から、前記
第一及び第二の燃料の量の和に対する前記第一の燃料の
量の割合を演算する除算器と、炉の燃焼状態からリアル
タイムに演算して求められた前記第一及び第二の燃料の
量の和に対する第一の燃料の量の割合Ｒ′に対応する設
定信号と前記除算器からの演算値とが与えられてあり、
前記割合Ｒ′を前記演算値により補正して前記第一及び
第二の燃料の量の和に対する前記第一の燃料の量の割合
がＲ′となるような前記第一の燃料のための第一の調節
弁の開度を定める出力を行う調節器と、前記割合Ｒ′を
前記演算値により補正して前記第一及び第二の燃料の量
の和に対する前記第二の燃料の量の割合が（１−Ｒ′）
となるような前記第二の燃料のための第二の調節弁の開
度を定める出力を行う調節器と、前記第一の調節弁およ
び第二の調節弁を流れる各燃料の量の割合がＲ′および
（１−Ｒ′）となるように前記各調節弁の各開度を決定
する信号分配用の掛算器とを備えていることを特徴とす
る混焼炉の燃焼制御装置。1. A first and second flow rate converter for detecting the amount of each of the first and second fuels in a co-firing furnace for mixing a first fuel and a second fuel; A divider that calculates the ratio of the amount of the first fuel to the sum of the amounts of the first and second fuels from the output, and the first and the second obtained by calculating in real time from the combustion state of the furnace. A set signal corresponding to a ratio R'of the amount of the first fuel to the sum of the amounts of the two fuels and a calculated value from the divider are given,
The first fuel for the first fuel is corrected so that the ratio of the amount of the first fuel to the sum of the amounts of the first and second fuels is R'corrected by the calculated value. A controller for performing an output that determines the opening of one control valve, and a ratio of the amount of the second fuel to a sum of the amounts of the first and second fuels by correcting the ratio R'by the calculated value. Is (1-R ')
And a controller that performs an output that determines the opening degree of the second control valve for the second fuel such that the ratio of the amount of each fuel flowing through the first control valve and the second control valve is A combustion control device for a mixed combustion furnace, comprising: a multiplier for signal distribution that determines each opening of each control valve so that R'and (1-R ').
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5778292A JPH05257544A (en) | 1992-03-16 | 1992-03-16 | Combustion control device for mixed firing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5778292A JPH05257544A (en) | 1992-03-16 | 1992-03-16 | Combustion control device for mixed firing furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05257544A true JPH05257544A (en) | 1993-10-08 |
Family
ID=13065450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5778292A Pending JPH05257544A (en) | 1992-03-16 | 1992-03-16 | Combustion control device for mixed firing furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05257544A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002249820A (en) * | 2001-02-21 | 2002-09-06 | Nippon Steel Corp | Furnace temperature control method of heating furnace |
| US7870854B2 (en) * | 2007-03-12 | 2011-01-18 | FPI Fireplace Products International Ltd | Closed-loop control system for heating systems |
| CN102968132A (en) * | 2012-11-28 | 2013-03-13 | 重庆赛联自动化工程技术有限公司 | High-precision large-flow gas control method for bottom blowing system of revolving furnace |
| EP4585857A1 (en) * | 2024-01-10 | 2025-07-16 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Safety guard process for a combustion process |
-
1992
- 1992-03-16 JP JP5778292A patent/JPH05257544A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002249820A (en) * | 2001-02-21 | 2002-09-06 | Nippon Steel Corp | Furnace temperature control method of heating furnace |
| US7870854B2 (en) * | 2007-03-12 | 2011-01-18 | FPI Fireplace Products International Ltd | Closed-loop control system for heating systems |
| US20110073101A1 (en) * | 2007-03-12 | 2011-03-31 | Fpi Fireplace Products International, Ltd. | Control system for heating systems |
| CN102968132A (en) * | 2012-11-28 | 2013-03-13 | 重庆赛联自动化工程技术有限公司 | High-precision large-flow gas control method for bottom blowing system of revolving furnace |
| EP4585857A1 (en) * | 2024-01-10 | 2025-07-16 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Safety guard process for a combustion process |
| WO2025149197A1 (en) * | 2024-01-10 | 2025-07-17 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Safety guard process for a combustion process |
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