JP2941483B2 - Combustion air control device - Google Patents

Combustion air control device

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Publication number
JP2941483B2
JP2941483B2 JP11648491A JP11648491A JP2941483B2 JP 2941483 B2 JP2941483 B2 JP 2941483B2 JP 11648491 A JP11648491 A JP 11648491A JP 11648491 A JP11648491 A JP 11648491A JP 2941483 B2 JP2941483 B2 JP 2941483B2
Authority
JP
Japan
Prior art keywords
oxygen
output
circuit
determination circuit
control
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 - Fee Related
Application number
JP11648491A
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Japanese (ja)
Other versions
JPH04344019A (en
Inventor
隆 白居
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP11648491A priority Critical patent/JP2941483B2/en
Publication of JPH04344019A publication Critical patent/JPH04344019A/en
Application granted granted Critical
Publication of JP2941483B2 publication Critical patent/JP2941483B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Control Of Non-Electrical Variables (AREA)
  • Regulation And Control Of Combustion (AREA)

Description

【発明の詳細な説明】 【０００１】［発明の目的］ 【０００２】 【産業上の利用分野】本発明は加熱炉、ボイラーなどに
用いられる燃焼用空気制御装置に関する。 【０００３】 【従来の技術】従来の技術では酸素制御調節器からの出
力に対し、上段、下段個々の寄与率を設定し、空気過剰
率の補正を行っており、この場合酸素制御調節器の出力
が変化すると上下段の空気過剰が同時に変化しており、
フィードバック制御は実施していない。 【０００４】 【発明が解決しようとする課題】従来の技術では排ガス
の流れは、下段から上段へと流れる為下段の残量酸素は
上段側で燃焼し、省エネ、燃焼効率の向上を実現する為
には下段酸素が上段で燃焼する事を想定して、下段＞上
段に空気過剰率を設定する必要がある。これは、寄与率
を設定する事で可能であるが、従来技術に於いては一定
の差で、追従する為、上段で発生した酸素は無駄な余剰
空気となり、焼燃効率を低下させる要因となっていた。 【０００５】今回の発明では、出来るだけ余剰空気を少
なくし、燃焼効率を向上させ、安定した燃焼用空気制御
装置の提出が実現できる。 【０００６】［発明の構成］ 【０００７】 【課題を解決するための手段】本発明は燃焼装置内の排
ガス中の残存酸素量を制御する酸素制御調節器と、この
酸素制御調節器から出力される制御出力変化量の極性を
判定する極性判定回路と、通風路上流側と通風路下流側
との残存酸素量差が予め定められた範囲にあるか否かを
判定する許容差内判定回路と、この許容差内判定回路の
許容差判定出力及び極性判定回路からの極性判定出力に
よって更新指令を出力する接続判定回路と、この接続判
定回路からの更新指令によって酸素制御調節器からの信
号を更新し保持する保持回路と、この保持回路からの出
力値によって酸素の補正乗算値を変化させる酸素補正乗
算回路と、この酸素補正乗算回路の出力信号によって空
気操作端の弁開閉制御を指令する空気流量調節計とを具
備してなる燃焼用空気制御装置である。 【０００８】 【作用】燃焼制御系の酸素制御に於いて、燃焼装置内の
排ガスの流れを計測し、上流側燃焼装置の残量酸素を下
流側燃焼装置で燃焼させ、総合の排ガス量を一定に保
ち、安定した燃焼を得る。 【０００９】 【実施例】次に本発明の一実施例を説明する。図１は燃
焼装置内の排ガス中の残存酸素量を制御する酸素制御調
節器１と、酸素制御調節器１から出力される制御出力変
化量１ａの極性を判定する極性判定回路６と、通風路上
流側と通風路下流側との残存酸素量差が予め定められた
範囲にあるか否かを判定する許容差内判定回路７と、許
容差内判定回路７の許容差判定出力７ａ及び極性判定回
路６からの極性判定出力によって更新指令３ａ，５ａを
出力する接続判定回路３，５と、接続判定回路３，５か
らの更新指令３ａ，５ａによって酸素制御調節器１から
の信号を更新し保持する保持回路２，４と、この保持回
路２，４からの出力値によって酸素の補正乗算値を変化
させる酸素補正乗算回路９，１１と、酸素補正乗算回路
９，１１の出力信号によって空気操作端１４，１５の弁
開閉制御を指令する空気流量調節計１２，１３とを具備
してなる燃焼用空気制御装置を示している。 【００１０】即ち、本発明は酸素制御調節計１の出力極
性により、下流側、上流側の操作する場所を選択し、空
気過剰率Ｍ1，Ｍ2を変化させ、効率的な燃焼を得る事を
目的とするものであり酸素制御調節器１の制御出力変化
量が＋側（増）か−側（減）方向かを極性判定回路６で
判定し、＋側フラグ、−側フラグを出力し、又、許容差
内判定回路７にて上流側と下流側の差がある一定範囲内
であるか否かを判定し、接続判定回路へ出力する。 【００１１】接続判定回路３，５に於いて極性判定回路
６よりの＋、−信号と許容差内判定回路出力７とから酸
素制御調節器１の出力を更新するか否かを判断し、保持
回路２，４に対し、更新指令を出力し、保持回路２，４
は、接続判定回路３，５の更新指令がＯＮの時、酸素制
御調節器１からの出力を受けデータを更新し、更新指令
がＯＦＦの時は前回データを保持し、空気流量調節計１
２，１３の設定値が保持される。但し、燃料流量が変化
した場合は燃料流量に見合った空気流量Ｘ（空気過剰率
Ｍ1又はＭ2）×（寄与率Ｋ1又はＫ2）×（前回酸素出
力）により変化する。 【００１２】そして、図２の様に調節計出力が増となっ
た時は、許容範囲内であれば下流側の空気流量が増加す
る（上流は保持）。また下流側空気流量の増加分だけで
補正できなくなった場合は、下流側空気流量は保持し、
上流側が増加する。上流側が増加し上流／下流の差が許
容範囲内となった場合は再度上流側は保持し、下流側が
増加する。以後同様に下流側が先行増加し、上流側が後
より増加する動作を繰り返す。 【００１３】次に酸素調節計出力が減となった時は、許
容範囲内であれば、上流側が減少する（下流側は保
持）。上流側空気流量の減少分だけで補正できなくなっ
た場合は上流側空気流量は保持し、下流側が減少する。
下流側が減少し、上流／下流の差が許容範囲内となった
場合は再度下流側は保持し、上流側が減少する。以後同
様に上流側が先行減少し、下流側が後より減少する動作
を繰り返す。 【００１４】尚、図２においてＡは減少、Ｂは増加、ｃ
は許容範囲外を示す。 【００１５】 【発明の効果】本発明により燃焼装置内の残存酸素量を
少なくし、安定した焼燃が可能となる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion air control device used for a heating furnace, a boiler and the like. [0003] In the prior art, the contribution from the oxygen control controller is set for each of the upper and lower stages, and the excess air ratio is corrected. When the output changes, the excess air in the upper and lower stages also changes at the same time,
No feedback control is implemented. [0004] In the prior art, the flow of exhaust gas flows from the lower stage to the upper stage, so that the residual oxygen in the lower stage is burned in the upper stage, so that energy saving and improvement in combustion efficiency can be realized. It is necessary to set the excess air ratio in the lower stage> the upper stage, assuming that the lower stage oxygen burns in the upper stage. This can be achieved by setting the contribution ratio.However, in the prior art, the oxygen generated in the upper stage becomes useless surplus air because it follows with a certain difference, which is a factor that reduces the burning efficiency. Had become. According to the present invention, it is possible to reduce the excess air as much as possible, improve the combustion efficiency, and realize a stable combustion air control device. According to the present invention, there is provided an oxygen control regulator for controlling the amount of residual oxygen in exhaust gas in a combustion device, and an output from the oxygen control regulator. A polarity determination circuit that determines the polarity of the control output change amount, and a tolerance difference determination circuit that determines whether a residual oxygen amount difference between the ventilation path upstream and the ventilation path downstream is within a predetermined range. A connection determination circuit that outputs an update command according to the tolerance determination output of the tolerance determination circuit and the polarity determination output from the polarity determination circuit, and updates a signal from the oxygen control controller according to the update command from the connection determination circuit. A holding circuit for holding and holding, an oxygen correction multiplying circuit for changing a correction multiplication value of oxygen according to an output value from the holding circuit, and a command for valve opening / closing control of the air operation end by an output signal of the oxygen correction multiplication circuit. That is a combustion air control device comprising comprising an air flow controller. In the oxygen control of the combustion control system, the flow of the exhaust gas in the combustion device is measured, and the residual oxygen in the upstream combustion device is burned in the downstream combustion device to keep the total exhaust gas amount constant. To obtain stable combustion. Next, an embodiment of the present invention will be described. FIG. 1 shows an oxygen control controller 1 for controlling the amount of residual oxygen in exhaust gas in a combustion device, a polarity determination circuit 6 for determining the polarity of a control output change 1a output from the oxygen control controller 1, and an on-air passage. A tolerance determination circuit 7 for determining whether the residual oxygen amount difference between the flow side and the downstream side of the ventilation path is within a predetermined range; a tolerance determination output 7a of the tolerance determination circuit 7; Connection determination circuits 3 and 5 that output update instructions 3a and 5a based on polarity determination output from circuit 6, and update and maintain signals from oxygen control controller 1 according to update instructions 3a and 5a from connection determination circuits 3 and 5, respectively. Holding circuits 2 and 4 that perform the correction, oxygen correction multiplication circuits 9 and 11 that change the correction multiplication value of oxygen according to the output values from the holding circuits 2 and 4, and the air operation terminals based on the output signals of the oxygen correction multiplication circuits 9 and 11. 14, 15 valve opening / closing control Shows the combustion air control device comprising comprising an air flow rate adjusting meter 12, 13 which direct. That is, according to the present invention, the operation places on the downstream side and the upstream side are selected according to the output polarity of the oxygen control controller 1, and the excess air ratios M 1 and M 2 are changed to obtain efficient combustion. The polarity determination circuit 6 determines whether the control output change amount of the oxygen control controller 1 is in the positive (increase) or negative (decrease) direction, and outputs a positive flag and a negative flag. The in-tolerance determination circuit 7 determines whether the difference between the upstream side and the downstream side is within a certain range, and outputs the result to the connection determination circuit. In the connection determination circuits 3 and 5, it is determined whether or not the output of the oxygen control controller 1 is to be updated based on the + and-signals from the polarity determination circuit 6 and the within-tolerance determination circuit output 7 and held. An update command is output to the circuits 2 and 4, and the holding circuits 2 and 4
When the update command of the connection determination circuits 3 and 5 is ON, the data is updated by receiving the output from the oxygen control controller 1, and when the update command is OFF, the previous data is held and the air flow controller 1
The set values of 2 and 13 are held. However, when the fuel flow rate changes, it changes according to the air flow rate X (excess air rate M 1 or M 2 ) × (contribution rate K 1 or K 2 ) × (previous oxygen output) corresponding to the fuel flow rate. When the output of the controller is increased as shown in FIG. 2, the air flow on the downstream side is increased (upstream is maintained) within the allowable range. If the correction cannot be made only by the increase in the downstream air flow, the downstream air flow is maintained,
The upstream side increases. If the upstream side increases and the difference between upstream and downstream falls within the allowable range, the upstream side is held again and the downstream side increases. Thereafter, similarly, the downstream side repeats the operation of leading increase and the upstream side increasing later. Next, when the output of the oxygen controller decreases, if it is within the allowable range, the upstream side decreases (the downstream side is held). If the correction cannot be performed only by the decrease in the upstream air flow rate, the upstream air flow rate is maintained and the downstream air flow rate decreases.
When the downstream side decreases and the upstream / downstream difference falls within the allowable range, the downstream side is held again and the upstream side decreases. Thereafter, the upstream side repeats the operation of decreasing in advance and the downstream side decreasing in number later. In FIG. 2 , A is decreased, B is increased, c
Indicates out of the allowable range. According to the present invention, the amount of oxygen remaining in the combustion apparatus can be reduced, and stable combustion can be achieved.

【図面の簡単な説明】 【図１】 本発明の一実施例を示す燃焼用空気制御装置
の構成図である。 【図２】 図１の作図を示す説明図である。 【符号の説明】 １…酸素制御調節器 ２…保持回路 ３…接続判定回路 ６…極性判定回路 ７…許容差内判定回路 ９…酸素補正乗算回路 １２…空気流量調節計BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of a combustion air control device showing one embodiment of the present invention. FIG. 2 is an explanatory diagram showing the drawing of FIG. 1; [Description of Signs] 1 ... Oxygen control controller 2 ... Holding circuit 3 ... Connection determination circuit 6 ... Polarity determination circuit 7 ... Intra-tolerance determination circuit 9 ... Oxygen correction multiplication circuit 12 ... Air flow controller

フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) F23N 5/00 F23N 3/06 G05D 11/13 Continuation of the front page (58) Field surveyed (Int. Cl. 6 , DB name) F23N 5/00 F23N 3/06 G05D 11/13

Claims (1)

(57)【特許請求の範囲】 燃焼装置内の排ガス中の残存酸素量を制御する酸素制御
調節器と、この酸素制御調節器から出力される制御出力
変化量の極性を判定する極性判定回路と、通風路上流側
と通風路下流側との残存酸素量差が予め定められた範囲
にあるか否かを判定する許容差内判定回路と、この許容
差内判定回路の許容差判定出力及び前記極性判定回路か
らの極性判定出力によって更新指令を出力する接続判定
回路と、この接続判定回路からの前記更新指令によって
前記酸素制御調節器からの信号を更新し保持する保持回
路と、この保持回路からの出力値によって酸素の補正乗
算値を変化させる酸素補正乗算回路と、この酸素補正乗
算回路の出力信号によって空気操作端の弁開閉制御を指
令する空気流量調節計とからなる燃焼用空気制御装置に
おいて、燃料流量の上流側理論値または下流側理論値に
基づいて前記酸素補正乗算回路に設定値を供給する空気
量算出乗算回路を具えたことを特徴とする燃焼用空気制
御装置。(57) [Claims] An oxygen control regulator for controlling an amount of residual oxygen in exhaust gas in a combustion device, and a polarity determination circuit for determining the polarity of a control output change amount output from the oxygen control regulator. A tolerance determination circuit for determining whether the residual oxygen amount difference between the upstream side of the ventilation path and the downstream side of the ventilation path is within a predetermined range, a tolerance determination output of the tolerance determination circuit, A connection determination circuit that outputs an update command according to a polarity determination output from a polarity determination circuit, a holding circuit that updates and holds a signal from the oxygen control controller according to the update command from the connection determination circuit, and oxygen correction multiplier circuit for changing the correction multiplication value of the oxygen by the output value of the air flow controllers and the combustion air control consisting of commanding the valve opening and closing control of the air operation terminal by the output signal of the oxygen correction multiplier circuit To location
To the upstream theoretical value or the downstream theoretical value of the fuel flow rate.
Air for supplying a set value to the oxygen correction multiplication circuit based on
A combustion air control device comprising a quantity calculation multiplication circuit .
JP11648491A 1991-05-22 1991-05-22 Combustion air control device Expired - Fee Related JP2941483B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11648491A JP2941483B2 (en) 1991-05-22 1991-05-22 Combustion air control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11648491A JP2941483B2 (en) 1991-05-22 1991-05-22 Combustion air control device

Publications (2)

Publication Number Publication Date
JPH04344019A JPH04344019A (en) 1992-11-30
JP2941483B2 true JP2941483B2 (en) 1999-08-25

Family

ID=14688257

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11648491A Expired - Fee Related JP2941483B2 (en) 1991-05-22 1991-05-22 Combustion air control device

Country Status (1)

Country Link
JP (1) JP2941483B2 (en)

Also Published As

Publication number Publication date
JPH04344019A (en) 1992-11-30

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