JPH05118542A - Device to detect abnormality in combustion device - Google Patents
Device to detect abnormality in combustion deviceInfo
- Publication number
- JPH05118542A JPH05118542A JP3280239A JP28023991A JPH05118542A JP H05118542 A JPH05118542 A JP H05118542A JP 3280239 A JP3280239 A JP 3280239A JP 28023991 A JP28023991 A JP 28023991A JP H05118542 A JPH05118542 A JP H05118542A
- Authority
- JP
- Japan
- Prior art keywords
- combustion
- oxygen concentration
- supply amount
- value
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2231/00—Fail safe
- F23N2231/10—Fail safe for component failures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
- F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
Landscapes
- Regulation And Control Of Combustion (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、バーナへの燃料供給量
の増減制御を実行すると共に、排気中の酸素濃度を検出
する検出手段の検出値に基づいて燃焼用の空気供給量の
増減制御とを実行する制御手段が設けられた燃焼装置の
異常検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention executes control for increasing / decreasing the amount of fuel supplied to a burner, and at the same time, increasing / decreasing the amount of air supplied for combustion based on the detection value of a detecting means for detecting the oxygen concentration in exhaust gas. The invention relates to an abnormality detection device for a combustion device, which is provided with control means for executing
【0002】[0002]
【従来の技術】かかる酸素濃度の検出手段として、例え
ば、限界電流型酸素センサ(以下、単に酸素センサとい
う)が用いられる。これは、ディスク状の安定化ジルコ
ニアの両面に設けた電極間に直流電圧を印加したとき
に、酸素イオンをキャリアとして流れる電流が酸素濃度
によって変化することを利用して酸素濃度を検出するも
のである。2. Description of the Related Art For example, a limiting current type oxygen sensor (hereinafter simply referred to as an oxygen sensor) is used as such oxygen concentration detecting means. This is to detect the oxygen concentration by utilizing the fact that when a DC voltage is applied between the electrodes provided on both sides of a disk-shaped stabilized zirconia, the current that flows with oxygen ions as carriers changes depending on the oxygen concentration. is there.
【0003】制御手段は、酸素センサの出力値に基づい
て、排気中の酸素濃度が適正値より低ければ燃焼用空気
が不足していると判断して空気供給量を増加させる。逆
に、適正値より高ければ燃焼用空気が過剰であると判断
して空気供給量を減少させる。又、バーナへの燃料供給
量は、例えば給湯器に用いられる燃焼装置の場合、設定
湯温と検出湯温との偏差を小さくするように増減制御さ
れる。Based on the output value of the oxygen sensor, the control means determines that the combustion air is insufficient if the oxygen concentration in the exhaust gas is lower than an appropriate value, and increases the air supply amount. On the contrary, if it is higher than the proper value, it is judged that the combustion air is excessive and the air supply amount is reduced. Further, the fuel supply amount to the burner is controlled to increase or decrease so as to reduce the deviation between the set hot water temperature and the detected hot water temperature in the case of a combustion device used for a hot water supply device, for example.
【0004】[0004]
【発明が解決しようとする課題】しかし、空気供給量が
適正であるにもかかわらず、バーナの局部変形や局部詰
まり等に起因して燃焼性が悪くなり、排気中に未燃成分
(CO,H2 等)が多量に含まれることがある。そし
て、この未燃成分の影響で酸素センサの出力値(以下、
センサ出力という)が大きくなることがわかっている。
すると、制御手段は、空気供給量が過剰であると誤判断
し空気供給量を減少させるので、ますます不完全燃焼が
進み適切な風量制御ができなくなってしまう。However, although the air supply amount is appropriate, the combustibility deteriorates due to local deformation of the burner, local clogging, etc., and unburned components (CO, CO, H 2 etc.) may be contained in large amounts. The output value of the oxygen sensor (hereinafter,
It is known that the sensor output) will increase.
Then, the control means erroneously determines that the air supply amount is excessive and reduces the air supply amount, so that the incomplete combustion further progresses and it becomes impossible to perform the appropriate air flow control.
【0005】以上のように、酸素センサを用いて検出さ
れる排気中の酸素濃度に基づいて燃焼用の空気供給量の
増減制御を実行する場合、一旦不完全燃焼が発生すると
不安定になるおそれがあった。本発明は、かかる実情に
鑑みて為されたものであって、その目的は、不完全燃焼
による酸素センサの誤動作を検出し、燃焼装置の安全性
を高めることにある。As described above, when the increase / decrease control of the air supply amount for combustion is executed based on the oxygen concentration in the exhaust gas detected by using the oxygen sensor, there is a risk that incomplete combustion once becomes unstable. was there. The present invention has been made in view of the above circumstances, and an object thereof is to detect a malfunction of an oxygen sensor due to incomplete combustion and improve the safety of a combustion device.
【0006】[0006]
【課題を解決するための手段】本発明の燃焼装置の異常
検出装置は、バーナへの燃料供給量の増減制御を実行す
ると共に、排気中の酸素濃度を検出する検出手段の検出
値に基づいて燃焼用の空気供給量の増減制御とを実行す
る制御手段が設けられたものであって、その特徴構成
は、前記制御手段が、前記燃料供給量又は前記空気供給
量の変化により前記検出手段の検出値が酸素濃度低下側
に変化することが予測されるときに、実際の検出値が酸
素濃度低下側に変化しなければ異常と判断するように構
成されている点にある。An abnormality detecting device for a combustion apparatus according to the present invention executes an increase / decrease control of a fuel supply amount to a burner and at the same time, based on a detection value of a detecting means for detecting an oxygen concentration in exhaust gas. A control means for executing increase / decrease control of the air supply amount for combustion is provided, and the characteristic configuration is that the control means controls the detection means of the detection means by a change in the fuel supply amount or the air supply amount. When it is predicted that the detected value will change to the oxygen concentration lower side, it is determined to be abnormal if the actual detected value does not change to the oxygen concentration lower side.
【0007】[0007]
【作用】上記の特徴構成によれば、制御手段は、まず燃
料供給量又は前記空気供給量の変化により前記検出手段
の検出値が酸素濃度低下側に変化する場合を予測する。
例えば、給湯器に用いられる燃焼装置において、設定湯
温を上げたり出湯量を増加させた場合に燃料供給量が増
加し、酸素濃度が一時低下することが予測される。或い
は、逆風により空気供給量が低下すると、酸素濃度が一
時低下することが予測される。According to the above characteristic structure, the control means first predicts a case where the detection value of the detection means changes to the oxygen concentration lower side due to the change of the fuel supply amount or the air supply amount.
For example, in a combustion device used for a water heater, when the set hot water temperature is raised or the hot water discharge amount is increased, it is predicted that the fuel supply amount will increase and the oxygen concentration will temporarily decrease. Alternatively, it is expected that the oxygen concentration will temporarily decrease when the air supply amount decreases due to the backwind.
【0008】実際に検出値の酸素濃度低下側への変化が
検出されると、制御手段は、酸素濃度を適正値に戻す方
向に空気供給量を増加させる。しかし、前述したような
理由で不完全燃焼が発生し、未燃成分の影響で酸素濃度
上昇側に変化したり、変化がない場合、即ち予測に反し
て酸素濃度低下側への変化が検出されない場合は異常で
あると判断し、例えば、燃焼停止等の適切な処理を行
う。When a change in the detected value toward the oxygen concentration lower side is actually detected, the control means increases the air supply amount in the direction of returning the oxygen concentration to the proper value. However, if incomplete combustion occurs due to the reasons described above and changes to the oxygen concentration increasing side due to the influence of unburned components, or if there is no change, that is, the change to the oxygen concentration decreasing side is not detected unexpectedly. In this case, it is determined to be abnormal, and appropriate processing such as combustion stop is performed.
【0009】[0009]
【発明の効果】従って、本発明によれば、不完全燃焼に
よる酸素センサの誤動作を検出し、制御手段による誤制
御を防止できるので、燃焼装置をより安全なものとする
ことができるようになった。As described above, according to the present invention, since the malfunction of the oxygen sensor due to the incomplete combustion can be detected and the erroneous control by the control means can be prevented, the combustion device can be made safer. It was
【0010】[0010]
【実施例】以下、本発明を給湯器に適用した実施例を図
面に基づいて説明する。本実施例の給湯器は図1に示す
ように構成されている。筒状ケース1内にバーナ2を備
える燃焼部3とその高温排気により水を加熱するフィン
チューブ型の熱交換器4が設けられている。筒状ケース
1の下端には燃焼部3に燃焼用空気を供給する通風手段
としてのファン5の吐出側が接続され、筒状ケース1の
上端には排気路6が接続されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a water heater will be described below with reference to the drawings. The water heater of this embodiment is configured as shown in FIG. A combustion unit 3 having a burner 2 and a fin-tube type heat exchanger 4 for heating water by its high temperature exhaust are provided in a cylindrical case 1. A discharge side of a fan 5 as a ventilation means for supplying combustion air to the combustion section 3 is connected to the lower end of the cylindrical case 1, and an exhaust passage 6 is connected to the upper end of the cylindrical case 1.
【0011】バーナ2への燃料供給路7には燃料供給量
を調節するためのガス比例弁8が設けられている。ガス
比例弁8は、マイクロコンピュータを利用した燃焼コン
トローラ9によって、その開度が制御される。つまり、
燃焼コントローラ9内の比例弁制御回路9aが、設定手
段Rによって設定された設定湯温と湯温検出手段Sによ
って検出される湯温との偏差を小さくするようにガス比
例弁8の励磁電流を制御し、もって燃料供給量を制御す
る。The fuel supply passage 7 to the burner 2 is provided with a gas proportional valve 8 for adjusting the fuel supply amount. The opening of the gas proportional valve 8 is controlled by a combustion controller 9 using a microcomputer. That is,
The proportional valve control circuit 9a in the combustion controller 9 controls the exciting current of the gas proportional valve 8 so as to reduce the deviation between the hot water temperature set by the setting means R and the hot water temperature detected by the hot water temperature detecting means S. Control, and thus the amount of fuel supply.
【0012】湯温を制御するには、バーナ2への燃料供
給量のみならず、燃焼部3への燃焼用空気の供給量をも
適切に制御する必要がある。そこで、燃焼コントローラ
9は、ファン5の送風量、即ち回転数をも制御する。そ
して、燃焼部3への空気供給量が適正であるかどうかを
監視すべく、排気中の酸素濃度を検出する検出手段とし
ての限界電流型酸素センサ(以下、単に酸素センサとい
う)10が排気路6に設けられている。つまり、排気中
の酸素濃度が適正値より大きければ、空気供給量が過剰
気味であると判断し、適正値より小さければ空気供給量
が不足気味であると判断することができる。In order to control the hot water temperature, it is necessary to appropriately control not only the fuel supply amount to the burner 2 but also the combustion air supply amount to the combustion section 3. Therefore, the combustion controller 9 also controls the blowing amount of the fan 5, that is, the rotation speed. Then, in order to monitor whether or not the amount of air supplied to the combustion section 3 is proper, a limiting current type oxygen sensor (hereinafter, simply referred to as an oxygen sensor) 10 as a detection means for detecting the oxygen concentration in the exhaust gas is provided in the exhaust passage. 6 is provided. That is, if the oxygen concentration in the exhaust gas is higher than the proper value, it can be determined that the air supply amount is excessive, and if it is smaller than the proper value, the air supply amount can be determined to be insufficient.
【0013】酸素センサ10は、図2に示すように、セ
ンサエレメント11、端子12、端子台13、メッシュ
カバー14からなる。センサエレメント11は、図3に
示すように、ディスク状の安定化ジルコニア11aの両
側に白金電極11bを形成し、その片側に小孔11cが
設けられたキャップ11dを接合して構成されている。
両電極11b間に電圧を印加すると、ポンピング作用に
より酸素イオンをキャリアとする電流が流れる。As shown in FIG. 2, the oxygen sensor 10 comprises a sensor element 11, a terminal 12, a terminal block 13 and a mesh cover 14. As shown in FIG. 3, the sensor element 11 is constructed by forming platinum electrodes 11b on both sides of a disk-shaped stabilized zirconia 11a and joining a cap 11d having a small hole 11c on one side thereof.
When a voltage is applied between both electrodes 11b, a current using oxygen ions as carriers flows due to the pumping action.
【0014】キャップ11d内への空気の流入が小孔1
1cによって制限されることから電圧の所定領域で電流
がほぼ一定(限界電流)になる。そして、この限界電流
は空気中の酸素濃度に比例して変化するので、一定電圧
(監視電圧)を両電極11b間に印加しておき、そのと
きの電流値から酸素濃度を検出することができる。又、
上記ポンピング作用は、高温(500℃程度)において
発生するするので、キャップ11d上部にヒータ11e
を一体に形成し、ヒータ11eへの通電によりセンサエ
レメント11を加熱するように構成している。The inflow of air into the cap 11d is caused by the small hole 1
Since it is limited by 1c, the current becomes almost constant (limit current) in a predetermined voltage range. Since this limiting current changes in proportion to the oxygen concentration in the air, a constant voltage (monitoring voltage) is applied between both electrodes 11b, and the oxygen concentration can be detected from the current value at that time. . or,
Since the pumping action occurs at a high temperature (about 500 ° C.), the heater 11e is provided above the cap 11d.
Is integrally formed, and the sensor element 11 is heated by energizing the heater 11e.
【0015】酸素センサ10の検出値(電流値)は燃焼
コントローラ9に入力され、燃焼コントローラ9は、そ
の検出値がバーナ2への燃料供給量に応じて定められた
適正値(酸素濃度目標値)に維持されるようにファン5
の回転数を制御し、燃焼部3への空気供給量を調節して
いる。この酸素濃度目標値と燃料供給量との関係は、予
め実験により求められたものであって、例えば図6に示
すようになる。尚、ファン5の回転数の制御は、燃焼コ
ントローラ9内のファン制御回路9bがファンモータへ
の印加電圧を変えることによって行っている。The detected value (current value) of the oxygen sensor 10 is input to the combustion controller 9, and the detected value of the combustion controller 9 is an appropriate value (oxygen concentration target value) determined according to the fuel supply amount to the burner 2. ) Fan 5 to be maintained in
Is controlled to control the amount of air supplied to the combustion unit 3. The relationship between the target oxygen concentration value and the fuel supply amount is obtained in advance by experiments, and is as shown in FIG. 6, for example. The rotation speed of the fan 5 is controlled by the fan control circuit 9b in the combustion controller 9 by changing the voltage applied to the fan motor.
【0016】次に、燃焼開始から停止までの燃焼コント
ローラ9による制御の概略について、図4及び図5の流
れ図に基づいて説明する。図4に示すように、給湯栓
(図示せず)が開かれ水流スイッチ15がオンになる
と、先ず、ファン5が駆動されプリパージが行われる。
しばらくして、ガス比例弁8等が開成されバーナ2が点
火される。Next, the outline of the control by the combustion controller 9 from the start of combustion to the stop will be described based on the flow charts of FIGS. 4 and 5. As shown in FIG. 4, when the hot water supply plug (not shown) is opened and the water flow switch 15 is turned on, first, the fan 5 is driven to perform pre-purge.
After a while, the gas proportional valve 8 and the like are opened and the burner 2 is ignited.
【0017】次に、燃焼制御・異常検出の処理が行われ
る。この処理については後述するが、異常検出の結果、
異常が検出された場合(異常フラグがセットされている
場合)には、設定手段Rに設けられた異常ランプ(燃焼
ランプと兼用)16を点滅させて燃焼を強制的に停止さ
せる。異常が検出されなかった場合は水流スイッチ15
がオフになるまで、燃焼制御・異常検出の処理が繰り返
される。つまり、給湯栓が閉じられ、水流スイッチ15
がオフになると、ガス比例弁8等を閉成して燃焼を停止
し、ファン5を数分間のポストパージの後に停止する。Next, a combustion control / abnormality detection process is performed. This process will be described later, but as a result of the abnormality detection,
When an abnormality is detected (when the abnormality flag is set), the abnormality lamp (also used as the combustion lamp) 16 provided in the setting means R is blinked to compulsorily stop the combustion. If no abnormality is detected, the water flow switch 15
The combustion control / abnormality detection process is repeated until is turned off. That is, the hot water tap is closed and the water flow switch 15
Is turned off, the gas proportional valve 8 and the like are closed to stop combustion, and the fan 5 is stopped after a few minutes of post-purge.
【0018】燃焼制御・異常検出の処理は、例えば図5
に示すサブルーチンのようになる。先ず、設定手段Rに
よって設定された設定湯温と湯温検出手段Sによって検
出される検出湯温とを読み込む。そして、設定湯温と検
出湯温との偏差に基づいて燃料供給量(即ちガス比例弁
8の操作量)を決定する(処理(イ))。The combustion control / abnormality detection process is performed, for example, in FIG.
It becomes like the subroutine shown in. First, the set hot water temperature set by the setting means R and the detected hot water temperature detected by the hot water temperature detecting means S are read. Then, the fuel supply amount (that is, the operation amount of the gas proportional valve 8) is determined based on the deviation between the set hot water temperature and the detected hot water temperature (process (a)).
【0019】この燃料供給量(操作量)は、燃焼コント
ローラ9内のメモリに記憶されると共に、前回値と比較
される。その結果、燃料供給量が増加している場合は、
それに応じて排気中の酸素濃度が低下することが予測さ
れるので、予想フラグをセットする。燃料供給量が減少
しているか変化がない場合は予想フラグをリセットす
る。この予想フラグは、後述する異常検出処理に用いら
れる。This fuel supply amount (manipulation amount) is stored in the memory in the combustion controller 9 and compared with the previous value. As a result, if the fuel supply is increasing,
Since it is predicted that the oxygen concentration in the exhaust gas will decrease accordingly, the prediction flag is set. If the fuel supply amount is decreasing or there is no change, the prediction flag is reset. This prediction flag is used in the abnormality detection process described later.
【0020】上記燃料供給量(操作量)に応じた励磁電
流でガス比例弁8が駆動され、次に、前述した酸素濃度
目標値と燃料供給量との関係(図6参照)から酸素濃度
目標値が決定される(処理(ロ))。一方、酸素センサ
10の検出値が読み込まれ、排気中の実際の酸素濃度が
検出される。The gas proportional valve 8 is driven by the exciting current corresponding to the fuel supply amount (operation amount), and then the oxygen concentration target is calculated from the relationship between the oxygen concentration target value and the fuel supply amount (see FIG. 6). The value is determined (process (b)). On the other hand, the detection value of the oxygen sensor 10 is read and the actual oxygen concentration in the exhaust gas is detected.
【0021】そして、前述の予想フラグがセットされて
いるとき、即ち燃料供給量の変化より排気中の酸素濃度
の低下が予測されたときに実際の酸素センサ10の検出
値が低下(正確には、酸素濃度低下側に変化)している
かどうかをチェックする。検出値が低下していない場合
は不完全燃焼が発生して、未燃成分により酸素センサ1
0が誤動作していると考えられるので異常フラグをセッ
トして図4のメインルーチンに戻る。Then, when the above-mentioned prediction flag is set, that is, when the decrease in the oxygen concentration in the exhaust gas is predicted due to the change in the fuel supply amount, the actual detection value of the oxygen sensor 10 decreases (to be exact, , The oxygen concentration is decreasing). If the detected value does not decrease, incomplete combustion occurs and the oxygen sensor 1
Since 0 is considered to be malfunctioning, an abnormality flag is set and the process returns to the main routine of FIG.
【0022】酸素センサ10の検出値が低下している場
合は正常であるので、酸素濃度目標値と検出値との偏差
に基づいて空気供給量(ファン5の操作量)を決定す
る。そして、この空気供給量(操作量)に応じた電圧で
ファン5が駆動される。以上の処理が終了するとメイン
ルーチンに戻る。Since it is normal when the detected value of the oxygen sensor 10 is lowered, the air supply amount (the operation amount of the fan 5) is determined based on the deviation between the oxygen concentration target value and the detected value. Then, the fan 5 is driven at a voltage corresponding to the air supply amount (operation amount). When the above process ends, the process returns to the main routine.
【0023】尚、実際の処理においては、燃料供給量の
増加により排気中の酸素濃度が低下するまでの遅延時
間、及び空気供給量が増加するまでの制御遅れを考慮し
て、適切に酸素濃度の低下を検出できるように予想フラ
グのセット/リセットに関して遅延時間を設けている。In the actual process, the oxygen concentration is properly adjusted in consideration of the delay time until the oxygen concentration in the exhaust gas decreases due to the increase in the fuel supply amount and the control delay until the air supply amount increases. A delay time is set for the set / reset of the anticipation flag so that the decrease of the can be detected.
【0024】以下に別実施例について列記する。 上記実施例においては、異常検出に際し、燃焼制御
の中で無作為に発生する燃料供給量の変化から排気中の
酸素濃度の低下を予測したが、燃焼制御とは別に、定期
的に又は特定の操作によって燃料供給量を変化させて排
気中の酸素濃度の低下が予測される状態を一時的に発生
させ、酸素センサの誤動作チェックを行うように構成し
てもよい。Other examples will be listed below. In the above-mentioned embodiment, when abnormality is detected, the decrease in the oxygen concentration in the exhaust gas is predicted from the change in the fuel supply amount that occurs randomly during the combustion control. The fuel supply amount may be changed by an operation to temporarily generate a state in which a decrease in the oxygen concentration in the exhaust gas is predicted, and the malfunction check of the oxygen sensor may be performed.
【0025】 排気中の酸素濃度の低下を予測できる
のは、燃料供給量が変化した場合に限らず、燃焼用空気
の供給量の変化から酸素濃度の低下を予測することもで
きる。例えば、燃料供給量が一定の時に不完全燃焼が発
生しない範囲でファンの駆動電圧を一時的に少し下げて
空気供給量を減らせば、当然排気中の酸素濃度の低下が
予測されるので、実際の酸素センサの検出値をチェック
して誤動作がないかどうかを判断することができる。The decrease of the oxygen concentration in the exhaust gas can be predicted not only when the fuel supply amount changes, but also the decrease of the oxygen concentration can be predicted from the change of the combustion air supply amount. For example, if the fan drive voltage is temporarily lowered slightly to reduce the air supply amount within the range where incomplete combustion does not occur when the fuel supply amount is constant, naturally the decrease in the oxygen concentration in the exhaust gas is predicted. It is possible to determine whether or not there is a malfunction by checking the detection value of the oxygen sensor of.
【0026】 又、少し複雑になるが、燃料供給量と
空気供給量の両方の変化より排気中の酸素濃度の低下を
予測することも可能である。Although slightly complicated, it is also possible to predict a decrease in oxygen concentration in exhaust gas from changes in both the fuel supply amount and the air supply amount.
【0027】尚、特許請求の範囲の項に図面との対照を
便利にするために符号を記すが、該記入により本発明は
添付図面の構成に限定されるものではない。It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.
【図1】本発明の実施例に係る湯沸器の構成図FIG. 1 is a configuration diagram of a water heater according to an embodiment of the present invention.
【図2】限界電流型酸素センサの断面図FIG. 2 is a sectional view of a limiting current type oxygen sensor.
【図3】センサユニットの断面図FIG. 3 is a sectional view of a sensor unit.
【図4】燃焼コントローラ(制御手段)の処理を示す流
れ図FIG. 4 is a flowchart showing a process of a combustion controller (control means).
【図5】燃焼制御・異常検出の処理を示す流れ図FIG. 5 is a flowchart showing a process of combustion control / abnormality detection.
【図6】燃料供給量と酸素濃度目標値との関係を示すグ
ラフFIG. 6 is a graph showing the relationship between the fuel supply amount and the oxygen concentration target value.
2 バーナ 9 制御手段 10 検出手段 2 burner 9 control means 10 detection means
Claims (1)
を実行すると共に、排気中の酸素濃度を検出する検出手
段(10)の検出値に基づいて燃焼用の空気供給量の増
減制御を実行する制御手段(9)が設けられた燃焼装置
の異常検出装置であって、前記制御手段(9)が、前記
燃料供給量又は前記空気供給量の変化により前記検出手
段(10)の検出値が酸素濃度低下側に変化することが
予測されるときに、実際の検出値が酸素濃度低下側に変
化しなければ異常と判断するように構成されている燃焼
装置の異常検出装置。1. An increase / decrease control of a fuel supply amount to a burner (2), and an increase / decrease control of a combustion air supply amount based on a detection value of a detection means (10) for detecting an oxygen concentration in exhaust gas. An abnormality detection device for a combustion apparatus, which is provided with control means (9) for executing the above, wherein the control means (9) detects the detection means (10) based on a change in the fuel supply amount or the air supply amount. An abnormality detection device for a combustion device, which is configured to determine that the value is abnormal if the actual detected value does not change to the oxygen concentration lower side when the value is predicted to change to the oxygen concentration lower side.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3280239A JP2922686B2 (en) | 1991-10-28 | 1991-10-28 | Combustion device abnormality detection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3280239A JP2922686B2 (en) | 1991-10-28 | 1991-10-28 | Combustion device abnormality detection device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05118542A true JPH05118542A (en) | 1993-05-14 |
JP2922686B2 JP2922686B2 (en) | 1999-07-26 |
Family
ID=17622242
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3280239A Expired - Fee Related JP2922686B2 (en) | 1991-10-28 | 1991-10-28 | Combustion device abnormality detection device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2922686B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0697564A1 (en) * | 1994-08-16 | 1996-02-21 | ABB Research Ltd. | Method for controlling and monitoring |
US20150260398A1 (en) * | 2013-11-12 | 2015-09-17 | SYNCRUDE CANADA LTD. in trust for the owners of the Syncrude Project, as such owners exist now and | Furnace combustion cross limit control with real-time diagnostic features |
-
1991
- 1991-10-28 JP JP3280239A patent/JP2922686B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0697564A1 (en) * | 1994-08-16 | 1996-02-21 | ABB Research Ltd. | Method for controlling and monitoring |
US20150260398A1 (en) * | 2013-11-12 | 2015-09-17 | SYNCRUDE CANADA LTD. in trust for the owners of the Syncrude Project, as such owners exist now and | Furnace combustion cross limit control with real-time diagnostic features |
Also Published As
Publication number | Publication date |
---|---|
JP2922686B2 (en) | 1999-07-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPH08152131A (en) | Combistion device | |
JP2922686B2 (en) | Combustion device abnormality detection device | |
JPH06242066A (en) | Method and equipment for detecting deterioration of oxygen sensor | |
JP2909425B2 (en) | Calibration device for unburned component concentration detector of combustion equipment | |
JP3364506B2 (en) | Combustion equipment | |
JP2825212B2 (en) | Combustion equipment | |
JPH06265140A (en) | Combustion apparatus | |
JP2001215213A (en) | Detector for combustion exhaust gas | |
JPH09287737A (en) | Combustion apparatus | |
JP2002071615A (en) | Gas concentration detector | |
JP2669771B2 (en) | Combustion equipment | |
JP2825213B2 (en) | Combustion equipment | |
JP3143259B2 (en) | Combustion device abnormality detection device | |
JP2968100B2 (en) | Combustion equipment | |
JP2825211B2 (en) | Combustion equipment | |
JP3884873B2 (en) | Incomplete combustion detector for combustion equipment | |
JP3312052B2 (en) | Combustion control device | |
JPS6045324B2 (en) | Combustion control device | |
JPH05119018A (en) | Combustion device | |
JPH0676861B2 (en) | Control device for hot air heater | |
KR940005117B1 (en) | Combustion control method for combustion device | |
JP3012497B2 (en) | Combustion equipment | |
JPH1114049A (en) | Gas combustion controller | |
JPH1114050A (en) | Gas combustion controller | |
JPH08121754A (en) | Device for detecting concentration of unburnt component of combustion equipment |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |