JP2018155443A - Combustion control device and method - Google Patents

Combustion control device and method Download PDF

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JP2018155443A
JP2018155443A JP2017052495A JP2017052495A JP2018155443A JP 2018155443 A JP2018155443 A JP 2018155443A JP 2017052495 A JP2017052495 A JP 2017052495A JP 2017052495 A JP2017052495 A JP 2017052495A JP 2018155443 A JP2018155443 A JP 2018155443A
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combustion
flame
threshold value
adjustment
sensor
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武志 西山
Takeshi Nishiyama
武志 西山
熊澤　雄一
Yuichi Kumazawa
雄一 熊澤
石井　重樹
Shigeki Ishii
重樹 石井
山田　晃
Akira Yamada
山田　　晃
覚 山岸
Satoru Yamagishi
覚 山岸
知也 中田
tomoya Nakata
知也 中田
加代 鈴木
Kayo Suzuki
加代 鈴木
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Azbil Corp
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Azbil Corp
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Priority to JP2017052495A priority Critical patent/JP2018155443A/en
Priority to US15/922,299 priority patent/US20180266683A1/en
Priority to CN201810219951.6A priority patent/CN108626742A/en
Publication of JP2018155443A publication Critical patent/JP2018155443A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
    • F23N5/082—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M11/00—Safety arrangements
    • F23M11/04—Means for supervising combustion, e.g. windows
    • F23M11/045—Means for supervising combustion, e.g. windows by observing the flame
    • 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
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/02—Starting or ignition cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/12—Burner simulation or checking
    • F23N2227/16—Checking components, e.g. electronic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F23N2229/22—Flame sensors the sensor's sensitivity being variable

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

PROBLEM TO BE SOLVED: To control a combustion facility stably for disturbance light without changing an existing combustion facility.SOLUTION: A flame detection adjustment unit 12 is configured to adjust a preset reference threshold value Hs, based on sensor output S indicating disturbance light, obtained from a flame sensor 20 before ignition trial in a combustion facility 30, and then output the obtained adjustment threshold value H. A combustion flame detection unit 11 is configured to detect the presence/absence of combustion flame in the combustion facility 30, based on the adjustment threshold value H and the sensor output S obtained from the flame sensor 20 during combustion in the combustion facility 30.SELECTED DRAWING: Figure 1

Description

本発明は、火炎センサのセンサ出力に応じて検出した火炎の有無に応じて燃焼を制御する燃焼制御技術に関する。   The present invention relates to a combustion control technique for controlling combustion according to the presence or absence of a flame detected according to the sensor output of a flame sensor.

工業炉、ボイラ、冷暖機器、厨房器、熱交換器などで用いられる燃焼設備では、バーナーでの火炎の光量を検出して電気信号で出力する火炎センサを設け、この火炎センサのセンサ出力と予め設定されているしきい値とに基づいて、燃焼制御装置で火炎の有無を検出し、その検出結果に応じて燃焼を制御するものとなっている。
従来、このような燃焼制御装置では、火炎の揺らぎによる火炎センサの出力変動の影響を抑えるため、着火検出時のセンサ出力である着火検出レベルより低い消炎検出レベルで火炎の消化を検出する、いわゆるヒステリシス特性に基づいて、火炎有無を検出するものとなっている（例えば、特許文献１など参照）。 Combustion equipment used in industrial furnaces, boilers, cooling / heating equipment, kitchen appliances, heat exchangers, etc. is provided with a flame sensor that detects the amount of flame light in the burner and outputs an electrical signal. Based on the set threshold value, the combustion control device detects the presence or absence of flame, and controls combustion according to the detection result.
Conventionally, in such a combustion control device, in order to suppress the influence of the fluctuation of the output of the flame sensor due to the fluctuation of the flame, the so-called flame digestion is detected at a flame extinction detection level lower than the ignition detection level which is the sensor output at the time of ignition detection. Based on the hysteresis characteristics, the presence or absence of a flame is detected (for example, see Patent Document 1).

特公平７−１５３２８号公報Japanese Patent Publication No. 7-15328 登録第３９４３４７８号Registration No. 3934478

しかしながら、このような従来技術では、火炎センサのセンサ出力としきい値とを比較することにより火炎有無を検出しているため、外光や迷光などの外乱光の影響で、消炎検出レベル以上で着火検出レベル以下の光量の疑似火炎が存在しているような環境下では、着火後に火炎が失火しても火炎センサのセンサ出力が消炎検出レベルまで低下しなくなるケースも考えられる。したがって、このようなケースでは、失火による消炎を検出できないため、失火後も燃料が放出され続けられることになり、非常に危険な状態となる可能性がある。   However, in such a conventional technique, the presence or absence of a flame is detected by comparing the sensor output of the flame sensor with a threshold value. In an environment where a pseudo flame with a light amount below the detection level exists, there may be a case where the sensor output of the flame sensor does not decrease to the flame extinction detection level even if the flame misfires after ignition. Therefore, in such a case, since extinguishing due to misfire cannot be detected, fuel can continue to be released even after a misfire, which can be extremely dangerous.

このような外乱の影響を抑制するため、バーナー構造を工夫して火炎センサに外乱光が入らないようにした技術が提案されている（例えば、特許文献２など参照）。しかし、どのような対応を行うかは設備メーカーに委ねられており、すべての燃焼装置でこのような対策が確実にとれているとは言い難かった。また、このようなバーナー構造を適用するには既存バーナーの交換など、既存の燃焼設備に対する変更が必要となるため、対策コストが大幅に増大することになる。   In order to suppress the influence of such disturbance, a technique has been proposed in which the burner structure is devised so that disturbance light does not enter the flame sensor (see, for example, Patent Document 2). However, it was left up to the equipment manufacturer to decide what kind of response to take, and it was difficult to say that such measures were taken reliably for all combustion devices. Further, in order to apply such a burner structure, it is necessary to change the existing combustion equipment such as replacement of the existing burner, so that the cost of countermeasures is greatly increased.

本発明はこのような課題を解決するためのものであり、既存の燃焼設備を変更することなく、外乱光に対して安全に燃焼設備を制御することができる燃焼制御技術を提供することを目的としている。   The present invention is for solving such problems, and an object of the present invention is to provide a combustion control technique capable of safely controlling a combustion facility against disturbance light without changing an existing combustion facility. It is said.

このような目的を達成するために、本発明にかかる燃焼制御装置は、火炎センサのセンサ出力から検出した燃焼設備内での燃焼火炎の有無に基づいて、前記燃焼設備での燃焼を制御する燃焼制御装置であって、前記燃焼設備での着火試行前に前記火炎センサから得られた、外乱光を示すセンサ出力に基づいて、予め設定されている基準しきい値を調整し、得られた調整しきい値を出力する火炎検出調整部と、前記燃焼設備での燃焼中に前記火炎センサから得られたセンサ出力と前記調整しきい値とに基づいて、前記燃焼設備内での燃焼火炎の有無を検出する燃焼火炎検出部と、前記燃焼火炎検出部で得られた燃焼火炎検出結果に基づいて、前記燃焼設備での燃焼を制御する燃焼制御部とを備えている。   In order to achieve such an object, a combustion control apparatus according to the present invention controls a combustion in the combustion facility based on the presence or absence of the combustion flame in the combustion facility detected from the sensor output of the flame sensor. A control device that adjusts a preset reference threshold value based on a sensor output indicating ambient light obtained from the flame sensor before an ignition trial in the combustion facility, and obtained adjustment Based on the flame detection adjusting unit for outputting a threshold value, the sensor output obtained from the flame sensor during combustion in the combustion facility and the adjustment threshold value, the presence or absence of a combustion flame in the combustion facility And a combustion control unit that controls combustion in the combustion facility based on a combustion flame detection result obtained by the combustion flame detection unit.

また、本発明にかかる上記燃焼制御装置の一構成例は、前記火炎検出調整部が、前記着火試行前に前記火炎センサから得られた複数のセンサ出力を統計処理することにより外乱光の大きさを示す調整値を算出し、前記基準しきい値に前記調整値を加算することにより前記基準しきい値を調整し、得られた前記調整しきい値を出力するようにしたものである。   Also, in one configuration example of the combustion control device according to the present invention, the flame detection adjusting unit statistically processes a plurality of sensor outputs obtained from the flame sensor before the ignition trial, thereby causing a magnitude of disturbance light. The adjustment threshold value is calculated, the adjustment value is added to the reference threshold value, the reference threshold value is adjusted, and the obtained adjustment threshold value is output.

また、本発明にかかる上記燃焼制御装置の一構成例は、前記基準しきい値が、第１の基準しきい値と前記第１の基準しきい値より低い第２の基準しきい値とからなり、前記火炎検出調整部は、前記第１の基準しきい値を調整して得られた第１の調整しきい値と、前記第２の基準しきい値を調整して得られた、前記第１の調整しきい値より低い第２の調整しきい値とを出力し、前記燃焼火炎検出部は、前記燃焼設備での燃焼中に得られた前記火炎センサのセンサ出力が、前記第１の調整しきい値以上となった場合に前記燃焼設備内での燃焼火炎ありを検出し、前記センサ出力が前記第２の調整しきい値以下となった場合に燃焼火炎なしを検出するようにしたものである。   Also, in one configuration example of the combustion control device according to the present invention, the reference threshold value is based on a first reference threshold value and a second reference threshold value lower than the first reference threshold value. The flame detection adjustment unit is obtained by adjusting the first reference threshold value obtained by adjusting the first reference threshold value and the second reference threshold value, A second adjustment threshold value lower than the first adjustment threshold value, and the combustion flame detection unit outputs a sensor output of the flame sensor obtained during combustion in the combustion facility as the first adjustment threshold value. Is detected when there is a combustion flame in the combustion equipment, and when the sensor output is equal to or less than the second adjustment threshold, no combustion flame is detected. It is a thing.

また、本発明にかかる燃焼制御方法は、火炎センサのセンサ出力から検出した燃焼設備内での燃焼火炎の有無に基づいて、前記燃焼設備での燃焼を制御する燃焼制御方法であって、火炎検出調整部が、前記燃焼設備での燃焼中に前記火炎センサから得られたセンサ出力と前記調整しきい値とに基づいて、前記燃焼設備内での燃焼火炎の有無を検出する火炎検出調整ステップと、燃焼火炎検出部が、前記燃焼設備での燃焼中に前記火炎センサから得られたセンサ出力と前記調整しきい値とに基づいて、前記燃焼設備内での燃焼火炎の有無を検出する燃焼火炎検出ステップと、燃焼制御部が、前記燃焼火炎検出ステップで得られた燃焼火炎検出結果に基づいて、前記燃焼設備での燃焼を制御する燃焼制御ステップとを備えている。   Further, the combustion control method according to the present invention is a combustion control method for controlling combustion in the combustion facility based on the presence or absence of the combustion flame in the combustion facility detected from the sensor output of the flame sensor. A flame detection adjustment step in which the adjustment unit detects the presence or absence of a combustion flame in the combustion facility based on a sensor output obtained from the flame sensor and the adjustment threshold value during combustion in the combustion facility; The combustion flame detecting unit detects the presence or absence of the combustion flame in the combustion facility based on the sensor output obtained from the flame sensor and the adjustment threshold value during the combustion in the combustion facility. The detection step and the combustion control unit include a combustion control step of controlling combustion in the combustion facility based on the combustion flame detection result obtained in the combustion flame detection step.

本発明によれば、外乱光の大きさを示す調整値だけ基準しきい値が高めに調整された調整しきい値が、燃焼設備内での燃焼火炎の有無の検出に用いられることになる。このため、外乱光が潜在的に存在しているような場合でも、燃焼火炎有無の検出に対する外乱光の影響を抑制できる。したがって、外乱光に対して安全に燃焼設備を制御することが可能となる。また、燃焼制御装置側で燃焼火炎検出用のしきい値を調整するようにしたので、火炎センサへ外乱光が入らないようにバーナー構造を変える必要はない。これにより、既存バーナーの交換など、既存の燃焼設備に対する変更が不要となるため、対策コストの大幅な増大を抑制することが可能となる。   According to the present invention, the adjustment threshold value adjusted so that the reference threshold value is increased by the adjustment value indicating the magnitude of the disturbance light is used to detect the presence or absence of the combustion flame in the combustion facility. For this reason, even when disturbance light exists potentially, the influence of disturbance light on detection of the presence or absence of a combustion flame can be suppressed. Therefore, the combustion facility can be controlled safely against disturbance light. Further, since the threshold value for detecting the combustion flame is adjusted on the combustion control device side, it is not necessary to change the burner structure so that ambient light does not enter the flame sensor. This eliminates the need to change the existing combustion equipment, such as replacement of the existing burner, so that it is possible to suppress a significant increase in countermeasure costs.

燃焼制御装置の構成を示すブロック図である。It is a block diagram which shows the structure of a combustion control apparatus. 調整値の算出を示す説明図である。It is explanatory drawing which shows calculation of an adjustment value. しきい値の調整を示す説明図である。It is explanatory drawing which shows adjustment of a threshold value. しきい値調整処理を示すフローチャートである。It is a flowchart which shows a threshold value adjustment process.

次に、本発明の実施の形態について図面を参照して説明する。
［燃焼制御装置］
まず、図１を参照して、本実施の形態にかかる燃焼制御装置１０について説明する。図１は、燃焼制御装置の構成を示すブロック図である。 Next, embodiments of the present invention will be described with reference to the drawings.
[Combustion control device]
First, with reference to FIG. 1, the combustion control apparatus 10 concerning this Embodiment is demonstrated. FIG. 1 is a block diagram showing the configuration of the combustion control device.

この燃焼制御装置１０は、火炎センサ２０からのセンサ出力Ｓに基づいて、燃焼設備３０の燃焼制御を行う装置である。
燃焼設備３０は、工業炉、ボイラ、冷暖機器、厨房器、熱交換器などで用いられる一般的な燃焼設備であり、バーナーで燃料を燃焼させることにより熱エネルギーを発生させる機能を有している。
火炎センサ２０は、燃焼設備３０のバーナーでの火炎の光量を検出して電気変換し、センサ出力Ｓとして燃焼制御装置１０へ出力するセンサである。 The combustion control device 10 is a device that performs combustion control of the combustion facility 30 based on the sensor output S from the flame sensor 20.
The combustion facility 30 is a general combustion facility used in an industrial furnace, a boiler, a cooling / heating device, a kitchen, a heat exchanger, and the like, and has a function of generating thermal energy by burning fuel with a burner. .
The flame sensor 20 is a sensor that detects the amount of flame light in the burner of the combustion facility 30, converts it electrically, and outputs it as a sensor output S to the combustion controller 10.

燃焼制御装置１０には、主な機能部として、燃焼火炎検出部１１、火炎検出調整部１２、および燃焼制御部１３が設けられている。これら機能部は、ＩＣを用いた制御回路で構成してもよく、ＣＰＵとプログラムとを協働させて実現してもよい。   The combustion control device 10 is provided with a combustion flame detection unit 11, a flame detection adjustment unit 12, and a combustion control unit 13 as main functional units. These functional units may be configured by a control circuit using an IC, or may be realized by cooperating a CPU and a program.

燃焼火炎検出部１１は、燃焼設備３０での着火試行前に火炎センサ２０のセンサ出力Ｓを取得し火炎検出調整部１２へ出力する機能と、燃焼設備３０での燃焼中に火炎センサ２０から得られたセンサ出力Ｓと火炎検出調整部１２から出力された調整しきい値Ｈとに基づいて、燃焼設備３０での燃焼火炎の有無を検出する機能とを有している。   The combustion flame detection unit 11 obtains the sensor output S of the flame sensor 20 and outputs it to the flame detection adjustment unit 12 before the ignition trial in the combustion facility 30, and is obtained from the flame sensor 20 during combustion in the combustion facility 30. It has a function of detecting the presence or absence of a combustion flame in the combustion facility 30 based on the sensor output S and the adjustment threshold value H output from the flame detection adjustment unit 12.

火炎検出調整部１２は、燃焼設備３０での着火試行前に燃焼火炎検出部１１から出力された、外乱光を示す火炎センサ２０のセンサ出力Ｓに基づいて、予め設定されている基準しきい値Ｈｓを調整し、得られた調整しきい値Ｈを燃焼火炎検出部１１へ出力する機能を有している。
具体的には、火炎検出調整部１２は、着火試行前に火炎センサ２０から得られた複数のセンサ出力Ｓを統計処理することにより外乱光の大きさを示す調整値Ｐを算出する機能と、基準しきい値Ｈｓに調整値Ｐを加算することにより基準しきい値Ｈｓを調整し、得られた調整しきい値Ｈを出力する。 The flame detection adjustment unit 12 is set in advance based on the sensor output S of the flame sensor 20 indicating disturbance light output from the combustion flame detection unit 11 before the ignition attempt in the combustion facility 30 is attempted. It has a function of adjusting Hs and outputting the obtained adjustment threshold value H to the combustion flame detector 11.
Specifically, the flame detection adjusting unit 12 calculates an adjustment value P indicating the magnitude of disturbance light by statistically processing a plurality of sensor outputs S obtained from the flame sensor 20 before the ignition trial, The reference threshold value Hs is adjusted by adding the adjustment value P to the reference threshold value Hs, and the obtained adjustment threshold value H is output.

図２は、調整値の算出を示す説明図である。ここでは、燃焼設備３０での着火試行前の時刻Ｔ０から時刻Ｔ１までを検出期間ＴＰとして予め設定し、この検出期間ＴＰに火炎センサ２０から得られた複数のセンサ出力Ｓを統計処理することにより、外光や迷光などの外乱光の大きさを示す調整値Ｐを算出する。調整値Ｐの具体例としては、これら複数のセンサ出力Ｓの平均値、最大値、最小値、中央値など、これら複数のセンサ出力Ｓの代表値を算出する一般的な統計処理で求めればよい。   FIG. 2 is an explanatory diagram illustrating calculation of the adjustment value. Here, from the time T0 to the time T1 before the ignition trial in the combustion facility 30 is set in advance as the detection period TP, and a plurality of sensor outputs S obtained from the flame sensor 20 are statistically processed in the detection period TP. Then, an adjustment value P indicating the magnitude of disturbance light such as external light or stray light is calculated. As a specific example of the adjustment value P, a general statistical process for calculating a representative value of the plurality of sensor outputs S such as an average value, maximum value, minimum value, and median value of the plurality of sensor outputs S may be obtained. .

図３は、しきい値の調整を示す説明図である。基準しきい値Ｈｓは、ヒステリシス特性を有しており、第１の基準しきい値Ｈｓ１（着火検出レベル）とこのＨｓより低い第２の基準しきい値Ｈｓ２（消炎検出レベル）とから構成されている。火炎検出調整部１２は、これらＨｓ１，Ｈｓ２に調整値Ｐを加算することにより、第１の調整しきい値Ｈ１（着火検出レベル）とＨ１より低い第２の調整しきい値Ｈ２（消炎検出レベル）とをそれぞれ計算する。   FIG. 3 is an explanatory diagram showing threshold adjustment. The reference threshold value Hs has a hysteresis characteristic, and includes a first reference threshold value Hs1 (ignition detection level) and a second reference threshold value Hs2 (extinguishing detection level) lower than this Hs. ing. The flame detection adjustment unit 12 adds the adjustment value P to these Hs1 and Hs2, thereby providing a first adjustment threshold value H1 (ignition detection level) and a second adjustment threshold value H2 (flame detection level) lower than H1. ) And respectively.

これにより、外乱光の大きさを示す調整値Ｐだけ基準しきい値Ｈｓが高めにシフト調整されたものが調整しきい値Ｈとして燃焼火炎検出部１１に出力されることになる。なお、外乱光が存在しない場合、調整値Ｐはゼロを示すことになり、基準しきい値Ｈｓと等しい調整しきい値Ｈが燃焼火炎検出部１１に出力される。   As a result, the reference threshold value Hs that has been shift-adjusted by the adjustment value P indicating the magnitude of the disturbance light is output to the combustion flame detector 11 as the adjustment threshold value H. When disturbance light does not exist, the adjustment value P indicates zero, and the adjustment threshold value H equal to the reference threshold value Hs is output to the combustion flame detection unit 11.

したがって、燃焼火炎検出部１１は、燃焼設備３０での燃焼中に得られた火炎センサ２０のセンサ出力Ｓが、第１の調整しきい値Ｈ１（着火検出レベル）以上となった場合に燃焼設備３０内での燃焼火炎ありＢｏｎを検出し、センサ出力Ｓが第２の調整しきい値Ｈ２（消炎検出レベル）以下となった場合に燃焼火炎なしＢｏｆｆを検出し、これらを燃焼火炎検出結果Ｂとして燃焼制御部１３に出力することになる。   Therefore, the combustion flame detection unit 11 is configured to combust the combustion equipment when the sensor output S of the flame sensor 20 obtained during the combustion in the combustion equipment 30 is equal to or higher than the first adjustment threshold value H1 (ignition detection level). When Bon with combustion flame within 30 is detected and the sensor output S is below the second adjustment threshold value H2 (extinguishing detection level), Boff without combustion flame is detected, and these are detected as combustion flame detection result B. Is output to the combustion controller 13.

燃焼制御部１３は、燃焼設備３０での燃焼中には燃焼火炎検出部１１からの燃焼火炎検出結果Ｂに基づいて燃焼設備３０での燃焼を制御する機能を有している。ここでの燃焼制御では、従来と同様であり、例えば、燃焼火炎検出結果Ｂが燃焼火炎ありＢｏｎを示す場合には、バーナーに対する燃料供給を指示する制御信号Ｃを燃焼設備３０に出力し、燃焼火炎検出結果Ｂが燃焼火炎なしＢｏｆｆを示す場合には、バーナーに対する燃料供給を停止を指示する制御信号Ｃを燃焼設備３０に出力する。   The combustion control unit 13 has a function of controlling combustion in the combustion facility 30 based on the combustion flame detection result B from the combustion flame detection unit 11 during combustion in the combustion facility 30. The combustion control here is the same as in the prior art. For example, when the combustion flame detection result B indicates Bon with a combustion flame, a control signal C instructing fuel supply to the burner is output to the combustion facility 30 and the combustion is performed. When the flame detection result B indicates Boff without combustion flame, a control signal C instructing to stop the fuel supply to the burner is output to the combustion facility 30.

なお、燃焼火炎検出部１１や火炎検出調整部１２については、燃焼制御装置１０ではなく火炎センサ２０に搭載してもよい。また、調整値Ｐについては、統計処理で求めるのではなく機械学習で学習した値を用いてもよい。   Note that the combustion flame detection unit 11 and the flame detection adjustment unit 12 may be mounted not on the combustion control device 10 but on the flame sensor 20. The adjustment value P may be a value learned by machine learning instead of being obtained by statistical processing.

［本実施の形態の動作］
次に、図４を参照して、本実施の形態にかかる燃焼制御装置１０の動作について説明する。図４は、しきい値調整処理を示すフローチャートである。
燃焼制御部１３は、燃焼設備３０での着火試行を開始する前に、図４のしきい値調整処理を実行する。 [Operation of this embodiment]
Next, the operation of the combustion control apparatus 10 according to the present embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing threshold adjustment processing.
The combustion control unit 13 executes the threshold adjustment process of FIG. 4 before starting the ignition trial in the combustion facility 30.

まず、火炎検出調整部１２は、燃焼設備３０での着火試行前に燃焼火炎検出部１１から出力された、外乱光を示す火炎センサ２０のセンサ出力Ｓを取得する（ステップ１００）。この際、センサ出力Ｓは、燃焼火炎検出部１１経由ではなく火炎センサ２０から直接取得してもよい。
次に、火炎検出調整部１２は、予め設定されている検出期間ＴＰに含まれる複数のセンサ出力Ｓを統計処理することにより、外光や迷光などの外乱光の大きさを示す調整値Ｐを算出する（ステップ１０１）。 First, the flame detection adjustment unit 12 acquires the sensor output S of the flame sensor 20 indicating disturbance light output from the combustion flame detection unit 11 before the ignition trial in the combustion facility 30 (step 100). At this time, the sensor output S may be acquired directly from the flame sensor 20 instead of via the combustion flame detector 11.
Next, the flame detection adjustment unit 12 statistically processes the plurality of sensor outputs S included in the preset detection period TP, thereby obtaining an adjustment value P indicating the magnitude of disturbance light such as external light and stray light. Calculate (step 101).

続いて、火炎検出調整部１２は、予め設定されている基準しきい値Ｈｓ１，Ｈｓ２に調整値Ｐをそれぞれ加算することにより、調整しきい値Ｈ１，Ｈ２を計算し（ステップ１０２）、得られた調整しきい値Ｈ１，Ｈ２を燃焼火炎検出部１１に出力して（ステップ１０３）、一連のしきい値調整処理を終了する。
［本実施の形態の効果］
このように、本実施の形態は、火炎検出調整部１２が、燃焼設備３０での着火試行前に火炎センサ２０から得られた、外乱光を示すセンサ出力Ｓに基づいて、予め設定されている基準しきい値Ｈｓを調整し、得られた調整しきい値Ｈを出力し、燃焼火炎検出部１１が、燃焼設備３０での燃焼中に火炎センサ２０から得られたセンサ出力Ｓと調整しきい値Ｈとに基づいて、燃焼設備３０内での燃焼火炎の有無を検出するようにしたものである。 Subsequently, the flame detection adjustment unit 12 calculates the adjustment threshold values H1 and H2 by adding the adjustment value P to the preset reference threshold values Hs1 and Hs2, respectively (step 102). The adjusted threshold values H1 and H2 are output to the combustion flame detector 11 (step 103), and the series of threshold value adjusting processes is terminated.
[Effects of the present embodiment]
As described above, in the present embodiment, the flame detection adjustment unit 12 is preset based on the sensor output S indicating the disturbance light obtained from the flame sensor 20 before the ignition trial in the combustion facility 30. The reference threshold value Hs is adjusted, the obtained adjusted threshold value H is output, and the combustion flame detection unit 11 adjusts the sensor output S obtained from the flame sensor 20 during combustion in the combustion facility 30 to the adjustment threshold value. Based on the value H, the presence or absence of a combustion flame in the combustion facility 30 is detected.

これにより、外乱光の大きさを示す調整値Ｐだけ基準しきい値Ｈｓが高めに調整された調整しきい値Ｈが、燃焼設備３０内での燃焼火炎の有無の検出に用いられることになる。このため、外乱光が潜在的に存在しているような場合でも、燃焼火炎有無の検出に対する外乱光の影響を抑制できる。したがって、外乱光に対して安全に燃焼設備３０を制御することが可能となる。また、燃焼制御装置１０側で燃焼火炎検出用のしきい値を調整するようにしたので、火炎センサ２０へ外乱光が入らないようにバーナー構造を変える必要はない。これにより、既存バーナーの交換など、既存の燃焼設備３０に対する変更が不要となるため、対策コストの大幅な増大を抑制することが可能となる。   As a result, the adjustment threshold value H adjusted so that the reference threshold value Hs is increased by the adjustment value P indicating the magnitude of the disturbance light is used to detect the presence or absence of the combustion flame in the combustion facility 30. . For this reason, even when disturbance light exists potentially, the influence of disturbance light on detection of the presence or absence of a combustion flame can be suppressed. Therefore, it is possible to control the combustion facility 30 safely against disturbance light. Further, since the threshold value for detecting the combustion flame is adjusted on the combustion control device 10 side, it is not necessary to change the burner structure so that ambient light does not enter the flame sensor 20. Thereby, since the change with respect to the existing combustion equipment 30, such as replacement | exchange of the existing burner, becomes unnecessary, it becomes possible to suppress the significant increase in countermeasure cost.

［実施の形態の拡張］
以上、実施形態を参照して本発明を説明したが、本発明は上記実施形態に限定されるものではない。本発明の構成や詳細には、本発明のスコープ内で当業者が理解しうる様々な変更をすることができる。 [Extended embodiment]
The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

１０…燃焼制御装置、１１…燃焼火炎検出部、１２…火炎検出調整部、１３…燃焼制御部、２０…火炎センサ、３０…燃焼設備、Ｓ…センサ出力、Ｈ…調整しきい値、Ｈ１…第１の調整しきい値、Ｈ２…第２の調整しきい値、Ｈｓ…基準しきい値、Ｈｓ１…第１の基準しきい値、Ｈｓ２…第２の基準しきい値、Ｂ…燃焼火炎検出結果、Ｐ…代表値、Ｃ…制御信号。   DESCRIPTION OF SYMBOLS 10 ... Combustion control apparatus, 11 ... Combustion flame detection part, 12 ... Flame detection adjustment part, 13 ... Combustion control part, 20 ... Flame sensor, 30 ... Combustion equipment, S ... Sensor output, H ... Adjustment threshold value, H1 ... First adjustment threshold, H2 ... second adjustment threshold, Hs ... reference threshold, Hs1 ... first reference threshold, Hs2 ... second reference threshold, B ... combustion flame detection Result: P ... representative value, C ... control signal.

Claims (4)

火炎センサのセンサ出力から検出した燃焼設備内での燃焼火炎の有無に基づいて、前記燃焼設備での燃焼を制御する燃焼制御装置であって、
前記燃焼設備での着火試行前に前記火炎センサから得られた、外乱光を示すセンサ出力に基づいて、予め設定されている基準しきい値を調整し、得られた調整しきい値を出力する火炎検出調整部と、
前記燃焼設備での燃焼中に前記火炎センサから得られたセンサ出力と前記調整しきい値とに基づいて、前記燃焼設備内での燃焼火炎の有無を検出する燃焼火炎検出部と、
前記燃焼火炎検出部で得られた燃焼火炎検出結果に基づいて、前記燃焼設備での燃焼を制御する燃焼制御部と
を備えることを特徴とする燃焼制御装置。 A combustion control device that controls combustion in the combustion facility based on the presence or absence of a combustion flame in the combustion facility detected from the sensor output of the flame sensor,
Based on the sensor output indicating ambient light obtained from the flame sensor before the ignition trial in the combustion facility, a preset reference threshold value is adjusted, and the obtained adjusted threshold value is output. A flame detection adjustment unit;
A combustion flame detector for detecting the presence or absence of a combustion flame in the combustion facility based on the sensor output obtained from the flame sensor and the adjustment threshold value during combustion in the combustion facility;
A combustion control device comprising: a combustion control unit that controls combustion in the combustion facility based on a combustion flame detection result obtained by the combustion flame detection unit. 請求項１に記載の燃焼制御装置において、
前記火炎検出調整部は、前記着火試行前に前記火炎センサから得られた複数のセンサ出力を統計処理することにより外乱光の大きさを示す調整値を算出し、前記基準しきい値に前記調整値を加算することにより前記基準しきい値を調整し、得られた前記調整しきい値を出力することを特徴とする燃焼制御装置。 The combustion control device according to claim 1,
The flame detection adjustment unit calculates an adjustment value indicating a magnitude of disturbance light by statistically processing a plurality of sensor outputs obtained from the flame sensor before the ignition trial, and sets the adjustment to the reference threshold value. A combustion control apparatus characterized by adjusting the reference threshold value by adding a value and outputting the obtained adjusted threshold value. 請求項１に記載の燃焼制御装置において、
前記基準しきい値は、第１の基準しきい値と前記第１の基準しきい値より低い第２の基準しきい値とからなり、
前記火炎検出調整部は、前記第１の基準しきい値を調整して得られた第１の調整しきい値と、前記第２の基準しきい値を調整して得られた、前記第１の調整しきい値より低い第２の調整しきい値とを出力し、
前記燃焼火炎検出部は、前記燃焼設備での燃焼中に得られた前記火炎センサのセンサ出力が、前記第１の調整しきい値以上となった場合に前記燃焼設備内での燃焼火炎ありを検出し、前記センサ出力が前記第２の調整しきい値以下となった場合に燃焼火炎なしを検出する
ことを特徴とする燃焼制御装置。 The combustion control device according to claim 1,
The reference threshold value includes a first reference threshold value and a second reference threshold value lower than the first reference threshold value;
The flame detection adjustment unit is configured to adjust the first reference threshold value obtained by adjusting the first reference threshold value and the first reference threshold value obtained by adjusting the second reference threshold value. And a second adjustment threshold value lower than the adjustment threshold value of
The combustion flame detection unit detects that there is a combustion flame in the combustion facility when the sensor output of the flame sensor obtained during combustion in the combustion facility is equal to or greater than the first adjustment threshold value. A combustion control device that detects and detects no combustion flame when the sensor output becomes equal to or less than the second adjustment threshold value. 火炎センサのセンサ出力から検出した燃焼設備内での燃焼火炎の有無に基づいて、前記燃焼設備での燃焼を制御する燃焼制御方法であって、
火炎検出調整部が、前記燃焼設備での燃焼中に前記火炎センサから得られたセンサ出力と前記調整しきい値とに基づいて、前記燃焼設備内での燃焼火炎の有無を検出する火炎検出調整ステップと、
燃焼火炎検出部が、前記燃焼設備での燃焼中に前記火炎センサから得られたセンサ出力と前記調整しきい値とに基づいて、前記燃焼設備内での燃焼火炎の有無を検出する燃焼火炎検出ステップと、
燃焼制御部が、前記燃焼火炎検出ステップで得られた燃焼火炎検出結果に基づいて、前記燃焼設備での燃焼を制御する燃焼制御ステップと
を備えることを特徴とする燃焼制御方法。 A combustion control method for controlling combustion in the combustion facility based on the presence or absence of a combustion flame in the combustion facility detected from the sensor output of the flame sensor,
A flame detection adjustment unit detects the presence or absence of a combustion flame in the combustion facility based on a sensor output obtained from the flame sensor and the adjustment threshold value during combustion in the combustion facility. Steps,
A combustion flame detection unit detects the presence or absence of a combustion flame in the combustion facility based on a sensor output obtained from the flame sensor and the adjustment threshold during combustion in the combustion facility. Steps,
And a combustion control step for controlling combustion in the combustion facility based on a combustion flame detection result obtained in the combustion flame detection step.
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