JP2006349312A - Safety confirmation method and combustion system for combustion facility - Google Patents

Safety confirmation method and combustion system for combustion facility Download PDF

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JP2006349312A
JP2006349312A JP2005179267A JP2005179267A JP2006349312A JP 2006349312 A JP2006349312 A JP 2006349312A JP 2005179267 A JP2005179267 A JP 2005179267A JP 2005179267 A JP2005179267 A JP 2005179267A JP 2006349312 A JP2006349312 A JP 2006349312A
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air
flow rate
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JP4553255B2 (en
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Kazuo Seki
一夫 関
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Azbil Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety confirmation method capable of acquiring exactly respective operation functions of an air supply system and a fuel gas supply system respectively to confirm safety, in advance to ignition of a combustion facility. <P>SOLUTION: When conducting purge treatment in advance to the ignition of the combustion facility, and when inspecting respectively the respective operation functions of a controller such as a damper and a flow regulating valve provided respectively in the air supply system and the fuel gas supply system to a combustor, during the purge treatment, a fuel gas cut-off valve provided in the fuel gas supply system is opened only for a short time just before starting the purge treatment, or concurrently with the start of the purge treatment, respective flow rates of air and fuel gas supplied respectively to the combustor therein are detected by flowmeters provided respectively in the air supply system and the fuel gas supply system, and normalities of the respective supply systems are inspected respectively based on the flow rates (air flow rate and gas flow rate). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、燃焼設備に組み込まれた燃焼器に空気と燃料ガスとを供給して上記燃料ガスを燃焼させるに先立ち、その空気供給系および燃料ガス供給系の動作機能を確認するに好適な燃焼設備の安全確認方法および安全確認機能を備えた燃焼システムに関する。   The present invention provides a combustion suitable for confirming the operation function of the air supply system and the fuel gas supply system before supplying the air and the fuel gas to the combustor incorporated in the combustion facility and combusting the fuel gas. The present invention relates to a facility safety confirmation method and a combustion system having a safety confirmation function.

ボイラ等の燃焼設備に組み込まれた燃焼器（例えばガスバーナ）に燃料ガスと空気とを供給して上記燃料ガスを燃焼させる場合、その点火に先立って上記燃焼設備内およびその排煙設備内をプリパージし、その安全性を確保することが重要である。ちなみに燃焼設備内に燃料ガスが残存していると、燃焼器の点火時に異常燃焼（例えば爆発）が生じる虞がある。また風量不足等に起因してプリパージが不十分な場合にも、その点火時に異常燃焼が生じる虞がある。   When fuel gas and air are supplied to a combustor (for example, a gas burner) incorporated in a combustion facility such as a boiler to burn the fuel gas, the inside of the combustion facility and the smoke exhausting facility are pre-purged prior to ignition. It is important to ensure the safety. Incidentally, if fuel gas remains in the combustion facility, abnormal combustion (for example, explosion) may occur when the combustor is ignited. Further, even when pre-purge is insufficient due to an insufficient air volume, abnormal combustion may occur during ignition.

そこで従来ではプリパージの実施中に、その風圧からプリパージに必要な最低風量が確保されているか否かを調べることでプリパージ機能の正常性を確認している。またこのプリパージ期間を利用して空気供給系に設けられた風量調整器（風量調整ダンパー）が正常に作動し得るか否か、つまりダンパーが最大開度と最小開度との間で正常に作動するか否かの動作確認を行っている。同時に上記風量調整器に機械的にリンクさせたガス流量調整器（流量調整ダンパー）についても、そのダンパーが正常に作動し得る否かの動作確認を行っている。   Therefore, conventionally, during the pre-purge, the normality of the pre-purge function is confirmed by checking whether or not the minimum air volume necessary for the pre-purge is secured from the wind pressure. Also, whether or not the air flow regulator (air flow adjustment damper) provided in the air supply system can operate normally using this pre-purge period, that is, the damper operates normally between the maximum opening and the minimum opening. Checking whether or not to do so. At the same time, with respect to the gas flow rate regulator (flow rate regulation damper) mechanically linked to the air volume regulator, an operation check is performed to determine whether or not the damper can operate normally.

そしてプリパージ機能が正常に作動し、また空気供給系および燃料ガス供給系にそれぞれ設けられた風量調整ダンパーおよびガス流量（ガス供給量）調整ダンパーが正常に動作することを確認した上で（安全確認）、プリパージの完了後に燃焼ガスの供給を開始し、燃焼器（バーナ）を点火することで燃焼を開始するものとなっている。   After confirming that the pre-purge function operates normally and that the air flow adjustment damper and gas flow rate (gas supply amount) adjustment damper provided in the air supply system and fuel gas supply system operate normally (safety check) ), The supply of combustion gas is started after the completion of the pre-purge, and combustion is started by igniting the combustor (burner).

しかしながらガス流量制御用ダンパーと風量調整ダンパーとを機械的にリンクして構成される燃焼システムの制御系は機械的に複雑であり、その機械的動作の確認に手間が掛かることが否めない。従ってガス流量制御用ダンパーと風量調整ダンパーとを個別に制御し得るようにし、その構成の簡素化を図ることが強く望まれる。しかしその場合、上記各ダンパーの動作確認を含む燃焼系の安全確認を如何にして行うかが大きな問題となる。   However, the control system of the combustion system configured by mechanically linking the gas flow rate control damper and the air volume adjustment damper is mechanically complicated, and it cannot be denied that it takes time to confirm the mechanical operation. Therefore, it is strongly desired to make it possible to individually control the gas flow rate control damper and the air volume adjustment damper and to simplify the configuration. However, in that case, it becomes a big problem how to check the safety of the combustion system including the operation check of each damper.

本発明はこのような事情を考慮してなされたもので、その目的は、燃焼設備に組み込まれた燃焼器に空気と燃料ガスとを供給して上記燃料ガスを燃焼させるに先立ち、その空気供給系および燃料ガス供給系の各動作機能をそれぞれ的確に把握して安全確認することのできる燃焼設備の安全確認方法を提供することにある。
また本発明の別の目的は、上述した安全確認機能を備え、燃焼制御を安全に、しかも空気供給系および燃料ガス供給系の各動作機能状態に応じて的確に実行することのできる簡易で実用性の高い構成の燃焼システムを提供することにある。 The present invention has been made in view of such circumstances, and its purpose is to supply air and fuel gas to a combustor incorporated in a combustion facility and burn the fuel gas before the air is supplied. It is an object of the present invention to provide a combustion facility safety confirmation method capable of accurately grasping each operation function of the fuel system and the fuel gas supply system and confirming safety.
Another object of the present invention is to provide the above-described safety confirmation function, which is simple and practical for performing combustion control safely and accurately depending on the operating function states of the air supply system and the fuel gas supply system. An object of the present invention is to provide a combustion system having a high configuration.

上述した目的を達成するべく本発明に係る燃焼設備の安全確認方法および燃焼システムは、燃焼設備とその排煙設備をプリパージする際、燃料ガス供給系を介して瞬時的に若干量の燃料ガスを燃焼設備に供給しても上記燃焼設備のプリパージに殆ど影響がないこと、またこのときに供給される燃料ガスの流量を検出すれば、燃料ガス供給系の動作特性（ガス流量制御機能等）を把握し得ることに着目してなされている。   In order to achieve the above-described object, the safety confirmation method and combustion system for a combustion facility according to the present invention, when pre-purging the combustion facility and its smoke exhaust facility, instantaneously generates a small amount of fuel gas via the fuel gas supply system. Supplying to the combustion facility has almost no effect on the pre-purge of the combustion facility, and if the flow rate of the fuel gas supplied at this time is detected, the operating characteristics of the fuel gas supply system (gas flow rate control function, etc.) It is made paying attention to what can be grasped.

そこで本発明に係る燃焼設備の安全確認方法は、燃焼設備に組み込まれた燃焼器に空気と燃料ガスとを供給して上記燃料ガスを燃焼させるに先立って、前記燃焼設備内およびその排煙設備内をパージ処理すると共に、このパージ処理中に前記燃焼器への空気供給系および燃料ガス供給系にそれぞれ設けられたダンパーや流量調整弁等の制御器の各動作機能をそれぞれ検査するに際し、
上記パージ処理の開始直前、または上記パージ処理の開始と同時に前記燃料ガス供給系に設けられた燃料ガス遮断弁を短時間だけ開放し、このときに前記燃焼器にそれぞれ供給される空気および燃料ガスの各流量を上記空気供給系および燃料ガス供給系にそれぞれ設けた流量計にて検出し、その流量（風量およびガス流量）から上記各供給系の正常性をそれぞれ検査することを特徴としている。 In view of this, the safety confirmation method for a combustion facility according to the present invention provides a method for confirming the inside of the combustion facility and its smoke exhausting device before supplying the air and the fuel gas to the combustor incorporated in the combustion facility and combusting the fuel gas. When purging the inside, and inspecting each operation function of a controller such as a damper and a flow rate adjusting valve respectively provided in the air supply system and the fuel gas supply system to the combustor during the purge process,
The fuel gas shut-off valve provided in the fuel gas supply system is opened for a short time immediately before the start of the purge process or simultaneously with the start of the purge process, and the air and the fuel gas respectively supplied to the combustor at this time Each flow rate is detected by a flow meter provided in each of the air supply system and the fuel gas supply system, and the normality of each supply system is inspected from the flow rates (air volume and gas flow rate).

具体的には請求項２に記載するように前記空気供給系に設けられた制御器は風量調整器（例えば風量調整ダンパー）であって、前記燃料ガス供給系に設けられた制御器は前記燃料ガス遮断弁とガス流量調整器（例えば流量調整弁や流量調整ダンパー）とを含み、また前記各供給系にそれぞれ設けられる流量計としては、熱式マイクロフローセンサを用いることが好ましい。また請求項３に記載するように前記各流量計を用いて、前記燃料ガス供給系に設けられた燃料ガス遮断弁を短時間だけ開放した際の最大流量および／または最小流量を求めるようにすれば良い。この際、流量変化の時定数（応答特性）を求めることも有用である。   Specifically, as described in claim 2, the controller provided in the air supply system is an air volume regulator (for example, an air volume adjustment damper), and the controller provided in the fuel gas supply system is the fuel. It is preferable to use a thermal microflow sensor as a flow meter including a gas shut-off valve and a gas flow regulator (for example, a flow regulating valve or a flow regulating damper) and provided in each of the supply systems. According to a third aspect of the present invention, the maximum flow rate and / or the minimum flow rate when the fuel gas shut-off valve provided in the fuel gas supply system is opened for a short time is obtained by using each flow meter. It ’s fine. At this time, it is also useful to obtain a time constant (response characteristic) of the flow rate change.

また本発明に係る燃焼システムは、請求項４に記載するように燃焼設備に組み込まれた燃焼器と、この燃焼器に空気を供給する空気供給系と、上記燃焼器に燃料ガスを供給する燃料ガス供給系とを具備したものであって、
特に上記空気供給系および燃料ガス供給系にそれぞれ組み込まれて空気および燃料ガスの各流量をそれぞれ検出する流量計と、
前記燃焼設備内およびその排煙設備内をパージ処理するに際して、少なくともパージ処理の直前またはパージ処理の開始と同時に前記燃料ガス供給系に設けられた燃料ガス遮断弁を短時間だけ開放すると共に、このときに前記燃焼器にそれぞれ供給される空気および燃料ガスの各流量を前記各流量計にて検出して前記各供給系の正常性をそれぞれ検査する安全確認手段と
を備えたことを特徴としている。 A combustion system according to the present invention includes a combustor incorporated in a combustion facility, an air supply system that supplies air to the combustor, and a fuel that supplies fuel gas to the combustor. A gas supply system,
In particular, a flow meter that is incorporated in the air supply system and the fuel gas supply system, respectively, and detects each flow rate of air and fuel gas, and
When purging the inside of the combustion facility and the smoke exhausting facility, at least immediately before the purge process or simultaneously with the start of the purge process, the fuel gas shut-off valve provided in the fuel gas supply system is opened for a short time, and this And safety confirmation means for detecting the flow rates of air and fuel gas supplied to the combustor from time to time by the flow meters and checking the normality of the supply systems, respectively. .

好ましくは請求項５に記載するように前記各供給系にそれぞれ設けられる流量計は、熱式マイクロフローセンサからなる。また請求項６に記載するように前記安全確認手段は、前記各供給系の正常性をそれぞれ検査した後、前記各供給系に組み込まれた複数の制御器の各動作機能をそれぞれ検査する動作確認機能を備えたものとして実現することが好ましい。   Preferably, the flow meter provided in each of the supply systems includes a thermal microflow sensor. Further, according to a sixth aspect of the present invention, the safety check means checks each operation function of a plurality of controllers incorporated in each supply system after checking the normality of each supply system. It is preferable to realize the function.

上述した燃焼設備の安全確認方法によれば、パージ処理の開始直前、または上記パージ処理の開始と同時に燃料ガス供給系に設けられた燃料ガス遮断弁を短時間（例えば１秒程度）だけ開放し、このときに前記燃焼器に燃料ガスの流量を上記燃料ガス供給系に設けた流量計にて検出すれば、これによって燃料ガス供給系を介して供給される燃料ガスの供給量（ガス流量）を検出するとことができる。特に燃料ガス供給系を閉じている（全閉）ときのガス流量と、燃料ガス供給系を開けた（全開）ときのガス流量とからその遮断特性と最大ガス供給量とを把握し、またガス流量の変化特性（変化の時定数）から該燃料ガス供給系の制御器（例えば遮断弁）の制御特性を把握することができる。   According to the safety check method for combustion equipment described above, the fuel gas shut-off valve provided in the fuel gas supply system is opened for a short time (for example, about 1 second) immediately before the start of the purge process or simultaneously with the start of the purge process. At this time, if the flow rate of the fuel gas to the combustor is detected by a flow meter provided in the fuel gas supply system, the supply amount of the fuel gas (gas flow rate) supplied through the fuel gas supply system thereby Can be detected. In particular, the shut-off characteristics and maximum gas supply amount can be determined from the gas flow rate when the fuel gas supply system is closed (fully closed) and the gas flow rate when the fuel gas supply system is opened (fully open). The control characteristic of the controller (for example, a shut-off valve) of the fuel gas supply system can be grasped from the change characteristic of the flow rate (change time constant).

尚、空気供給系を介して燃焼器に供給される空気量については、ブローモータ等の空気供給源の立ち上がりが遅いので、パージ処理の実行期間中に該空気供給系に設けた流量計を用いて検出すれば十分である。このようにして空気供給系に設けられた流量計を用いて検出される風量を検出すれば、その風量からプリパージ機能が正常に働くか否かを的確に判断することができる。また前述したように燃料ガス供給系に設けられた流量計を用いて検出される最大ガス供給量（ガス流量）から、例えば燃料ガス供給に対する遮断弁での遮断特性を的確に把握し、更には擦れ等に起因する遮断弁の緩慢動作に対する故障予知を行って、その正常性を確認することができる。この結果、風量調整機構とガス流量調整機構とを機械的にリンクした構成を採用しなくても、空気供給系および燃料ガス供給系の各動作機能が正常であるか否かを判定し、その安全確認を効果的に行うことができる。特に風量およびガス流量をそれぞれ直接的に検出して送風機（ブロワワモータ）や風量調整ダンパー、更には燃料遮断弁や燃料供給量調節弁等の各機能をそれぞれ確認することができるので、その安全確認の信頼性を十分高くすることができる。   As for the amount of air supplied to the combustor via the air supply system, since the rise of the air supply source such as a blow motor is slow, a flow meter provided in the air supply system is used during the purge processing execution period. Detection is sufficient. Thus, if the air volume detected using the flow meter provided in the air supply system is detected, it can be accurately determined whether or not the pre-purge function works normally from the air volume. Further, as described above, from the maximum gas supply amount (gas flow rate) detected using the flow meter provided in the fuel gas supply system, for example, the shutoff characteristic at the shutoff valve for the fuel gas supply is accurately grasped, and further It is possible to confirm the normality by performing failure prediction for the slow operation of the shutoff valve caused by rubbing or the like. As a result, it is determined whether or not each operation function of the air supply system and the fuel gas supply system is normal without adopting a configuration in which the air volume adjustment mechanism and the gas flow rate adjustment mechanism are mechanically linked. Safety confirmation can be performed effectively. In particular, the air volume and gas flow rate can be detected directly to check the functions of the blower (blower motor), air volume adjustment damper, fuel shut-off valve, fuel supply volume control valve, etc. Reliability can be made sufficiently high.

また本発明に係る燃焼システムによれば、空気供給系および燃料ガス供給系のそれぞれに流量計を備え、プリパージの直前またはプリパージと同時に瞬時的に燃料ガスを供給するだけで上記流量計を用いて検出されるガス流量から前記燃料ガス供給系の動作機能を確認することができるので、空気供給系に設けた流量計により検出される風量から確認されるプリバージ機能の正常性と相俟って、燃焼設備の動作安全性を信頼性良く確認することができる。   Further, according to the combustion system of the present invention, each of the air supply system and the fuel gas supply system is provided with a flow meter, and the fuel gas is instantaneously supplied just before or simultaneously with the pre-purge. Since the operation function of the fuel gas supply system can be confirmed from the detected gas flow rate, combined with the normality of the pre-barge function confirmed from the air volume detected by the flow meter provided in the air supply system, The operational safety of the combustion facility can be confirmed with high reliability.

特に流量計として熱式のマイクロフローメータを用いれば、その動作応答性が高い（早い）ので瞬時的に微少量の燃料ガスを供給するだけで短時間に燃料ガス供給系の動作機能を確認することができる。しかも上記熱式のマイクロフローメータは小型であり、既存の燃焼設備に組み込むことも容易なので、その実用的利点が非常に高い。更には流量計（熱式マイクロフローメータ）にて検出した風量やガス流量をフィードバックして燃焼制御情報として利用することも可能なので、燃焼システムの構成の大幅な簡素化を図り得る等の効果が奏せられる。   In particular, if a thermal micro flow meter is used as a flow meter, its operation response is high (fast), so the operation function of the fuel gas supply system can be confirmed in a short time by supplying a small amount of fuel gas instantaneously. be able to. In addition, the thermal microflow meter is small in size and can be easily incorporated into existing combustion equipment, so its practical advantage is very high. Furthermore, it is also possible to feed back the air volume and gas flow detected by a flow meter (thermal micro flow meter) and use them as combustion control information, so that the configuration of the combustion system can be greatly simplified. Played.

以下、図面を参照して本発明の一実施形態に係る燃焼システムと、この燃焼システムに適用される燃焼設備の安全確認方法について説明する。
図１はこの実施形態に係る燃焼システムの概略構成を示す図であり、１はボイラ等の燃焼設備に組み込まれた燃焼器としてのガスバーナ（メインバーナ）、２はパイロットバーナ、３は送風機（ブロワモータ）である。また４は燃焼制御および安全確認処理等を実行する制御装置（コントローラ）、５は火炎検知器である。ちなみに上記ガスバーナ１およびパイロットバーナ２には送風機３から空気供給系１０を介してそれぞれ空気Ａが供給されるようになっており、またこれらのガスバーナ１およびパイロットバーナ２には第１および第２の燃料ガス供給系２０,３０をそれぞれ介して燃料ガスＧが供給されるようになっている。 Hereinafter, a combustion system according to an embodiment of the present invention and a combustion facility safety confirmation method applied to the combustion system will be described with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration of a combustion system according to this embodiment. 1 is a gas burner (main burner) as a combustor incorporated in combustion equipment such as a boiler, 2 is a pilot burner, and 3 is a blower (blower motor). ). Further, 4 is a control device (controller) for executing combustion control and safety confirmation processing, and 5 is a flame detector. Incidentally, the gas burner 1 and the pilot burner 2 are each supplied with air A from the blower 3 through the air supply system 10, and the gas burner 1 and the pilot burner 2 are supplied with the first and second air burners. The fuel gas G is supplied through the fuel gas supply systems 20 and 30, respectively.

空気供給系１０には、該空気供給系１０を介して供給される空気の風圧を検出する圧力計１１と圧力スイッチ１２が設けられると共に、その供給路に直列に介挿されて風量調節用ダンパー（コントロールモータ付きバタフライ弁）１３が設けられている。尚、上記圧力スイッチ１２は、送風機３から送り出された空気Ａの圧力（風圧）が予め設定された圧力以下のときにオフ動作する下限値検出用のものからなる。また第１および第２の燃料ガス供給系２０,３０の上流側には、図示しない燃料ガス源から供給される燃料ガスＧの圧力（供給圧）を検出する圧力計２１および圧力スイッチ２２が設けられている。この圧力スイッチ２２も、燃料ガスＧの供給圧力が予め設定された圧力以下のときにオフ動作する下限値検出用のものからなる。   The air supply system 10 is provided with a pressure gauge 11 and a pressure switch 12 for detecting the wind pressure of the air supplied through the air supply system 10, and is inserted in series in the supply path to provide an air volume adjusting damper. (Butterfly valve with control motor) 13 is provided. The pressure switch 12 is for detecting a lower limit value that is turned off when the pressure (wind pressure) of the air A sent out from the blower 3 is equal to or lower than a preset pressure. A pressure gauge 21 and a pressure switch 22 for detecting the pressure (supply pressure) of the fuel gas G supplied from a fuel gas source (not shown) are provided upstream of the first and second fuel gas supply systems 20 and 30. It has been. The pressure switch 22 is also configured for detecting a lower limit value that is turned off when the supply pressure of the fuel gas G is equal to or lower than a preset pressure.

そしてガスバーナ（メインバーナ）１に対して燃料ガスＧを供給する第１の燃料ガス供給系２０には、２段に亘って安全遮断弁２３,２４が直列に介挿され、これらの安全遮断弁２３,２４の下流側に位置して圧力調整器（ガバナ）２５と流量調整用ダンパー（コントロールモータ付きバタフライ弁）２６とが順次直列に介挿されている。尚、上記圧力調整器（ガバナ）２５と流量調整用ダンパー２６との間の流路（燃料ガス管路）には、圧力計２７と圧力スイッチ２８とが設けられている。この圧力スイッチ２８は、燃料ガスＧの圧力が予め設定された圧力以上のときにオン動作する上限値検出用のものからなる。   The first fuel gas supply system 20 that supplies the fuel gas G to the gas burner (main burner) 1 is inserted with safety shut-off valves 23 and 24 in series over two stages. A pressure regulator (governor) 25 and a flow rate adjustment damper (butterfly valve with control motor) 26 are sequentially inserted in series at the downstream side of 23 and 24. A pressure gauge 27 and a pressure switch 28 are provided in a flow path (fuel gas pipe line) between the pressure regulator (governor) 25 and the flow rate adjusting damper 26. The pressure switch 28 is for detecting an upper limit value that is turned on when the pressure of the fuel gas G is equal to or higher than a preset pressure.

またパイロットバーナ２に燃料ガスＧを供給する第２の燃料ガス供給系３０には、第１の燃料ガス供給系２０と同様に２段に亘って安全遮断弁３３,３４が直列に介挿されており、これらの安全遮断弁３３,３４の下流側に位置して圧力調整器（ゼロガバナ）３５が直列に介挿されている。尚、図中３６はパイロットバーナ２の前段に設けられて燃料ガスと空気とを予混合するベンチュリミキサである。   Similarly to the first fuel gas supply system 20, safety shutoff valves 33 and 34 are inserted in series in the second fuel gas supply system 30 that supplies the fuel gas G to the pilot burner 2. A pressure regulator (zero governor) 35 is inserted in series at the downstream side of these safety shut-off valves 33 and 34. In the figure, reference numeral 36 denotes a venturi mixer which is provided in the front stage of the pilot burner 2 and premixes fuel gas and air.

このような風量および燃料ガス量の調整機構に加えてこの実施形態に係る燃焼システムにおいては、前述した空気供給系１０の下流側に該空気供給系１０を介してガスバーナ（メインバーナ）１に供給される空気Ａの流量（風量）を検出する流量計、具体的には熱式のマイクロフローメータ１４が設けられている。また第１および第２の燃料ガス供給系２０,３０にも、これらの各燃料ガス供給系２０,３０をそれぞれ介してガスバーナ１およびパイロットバーナ２に供給される燃料ガスＧの流量（ガス供給量）をそれぞれ検出する為の流量計（熱式マイクロフローメータ）２９,３７が設けられている。   In the combustion system according to this embodiment in addition to the air volume and fuel gas amount adjusting mechanism, the gas burner (main burner) 1 is supplied to the downstream side of the air supply system 10 via the air supply system 10. A flow meter for detecting the flow rate (air volume) of the air A, specifically, a thermal micro flow meter 14 is provided. The first and second fuel gas supply systems 20 and 30 also have a flow rate (gas supply amount) of the fuel gas G supplied to the gas burner 1 and the pilot burner 2 through the fuel gas supply systems 20 and 30, respectively. ) Are respectively provided for detection of flow meters (thermal micro flow meters) 29 and 37.

尚、これらの熱式マイクロフローメータ１４,２９,３７は、例えば特開２００４−１７０１１３号公報に開示されるように、半導体基板上に発熱素子Ｒhを挟んで一対の温度センサ（感温抵抗）Ｒu,Ｒdを設け、上記半導体基板の表面に沿って流れる流体によって生じ温度分布の変化を上記温度センサＲu,Ｒdにより検出される流体の流れに沿った温度差として捉えることで、上記流体の流れの向きとその質量流量とを求めるようなものからなる。ちなみにこの種のマイクロフローセンサの応答速度は、例えば略２０ｍ秒程度と高速である。従って第１の燃料ガス供給系２０の安全遮断弁２３,２４を全閉状態から全開状態へ、更に全閉状態へと１秒程度だけ開閉して燃料ガスＧを瞬間的に供給しても、これに伴って第１の燃料ガス供給系２０を流れる燃料ガスＧの流量を確実に検出することができる。しかも流量の変化を時々刻々捉えることで、その変化の様子、ひいては上記安全遮断弁２３,２４の動作応答特性をモニタすることも可能である。   These thermal microflow meters 14, 29, and 37 are, for example, a pair of temperature sensors (temperature sensitive resistors) with a heating element Rh sandwiched on a semiconductor substrate as disclosed in Japanese Patent Application Laid-Open No. 2004-170113. By providing Ru and Rd, the change in temperature distribution caused by the fluid flowing along the surface of the semiconductor substrate is regarded as the temperature difference along the fluid flow detected by the temperature sensors Ru and Rd, thereby allowing the flow of the fluid. The direction and the mass flow rate are obtained. Incidentally, the response speed of this type of microflow sensor is as high as about 20 milliseconds, for example. Accordingly, even if the safety gas shutoff valves 23 and 24 of the first fuel gas supply system 20 are opened and closed for about 1 second from the fully closed state to the fully open state and further to the fully closed state, Accordingly, the flow rate of the fuel gas G flowing through the first fuel gas supply system 20 can be reliably detected. Moreover, it is possible to monitor the change of the flow rate and the operational response characteristics of the safety shut-off valves 23 and 24 by monitoring the change of the flow rate every moment.

例えばマイクロプロセッサによって構成される制御装置（コントローラ）４は、基本的には図示しない操作卓からの指令に基づいて前述した送風機１１の運転、安全遮断弁２３,２４等の開閉制御、流量調整用ダンパー２６におけるガス供給量の制御、更にはガスバーナ（メインバーナ）１およびパイロットバーナ２の点火／消化制御等を実行し、該燃焼設備における燃焼を制御するものである。特に制御装置４は、ガスバーナ１による燃焼指示が与えられたとき、ガスバーナ１の点火に先立って前記安全遮断弁２３,２４等を全閉状態に保って燃料ガスＧの供給を遮断した状態で送風機３だけを作動させ、ガスバーナ１が設けられた燃焼設備（燃焼室）内およびその煙道設備内をプリパージする機能を備えている。尚、このプリパージについては、煙道設備に組み込まれた排煙設備（図示せず）を併用して行われることもある。   For example, the control device (controller) 4 constituted by a microprocessor is basically used for the above-described operation of the blower 11, opening / closing control of the safety shut-off valves 23, 24, and flow rate adjustment based on a command from a console (not shown). Control of the gas supply amount in the damper 26 and ignition / digestion control of the gas burner (main burner) 1 and the pilot burner 2 are executed to control the combustion in the combustion facility. In particular, when the combustion instruction by the gas burner 1 is given, the control device 4 keeps the safety shut-off valves 23, 24, etc. in a fully closed state before the gas burner 1 is ignited and shuts off the supply of the fuel gas G. 3 is operated, and the inside of the combustion equipment (combustion chamber) in which the gas burner 1 is provided and the function of pre-purging the inside of the flue equipment are provided. Note that this pre-purge may be performed in combination with a flue gas facility (not shown) incorporated in the flue facility.

そして制御装置４は上記プリパージ処理に要する期間を利用して、例えば前記風量調節用ダンパー（コントロールモータ付きバタフライ弁）１３が正常に作動するか否かの動作確認を行うと共に、流量調整用ダンパー（コントロールモータ付きバタフライ弁）２６が正常に作動するか否かの動作確認を行う等、空気供給系１０および燃料ガス供給系２０,３０のそれぞれに組み込まれた制御器（ダンパー等）の動作確認を実行する。   Then, the control device 4 makes use of the period required for the pre-purge process, for example, confirms whether or not the air volume adjusting damper (butterfly valve with control motor) 13 operates normally, and also controls the flow rate adjusting damper ( Confirm the operation of the controller (damper, etc.) incorporated in each of the air supply system 10 and the fuel gas supply systems 20 and 30, such as confirming whether or not the butterfly valve with control motor 26 operates normally. Execute.

特にこの燃焼制御システムにおいては、前記制御装置４はプリパージを実行する直前、またはプリパージの開始と同時に前記第１の燃料ガス供給系２０における安全遮断弁２３,２４を全閉状態から全開状態へ、更にこの全開状態から全閉状態へと１秒程度だけ開閉し、これによって燃料ガスＧを瞬間的にガスバーナ１に供給するものとなっている。また上記安全遮断弁２３,２４の開閉制御と同時に第２の燃料ガス供給系３０における安全遮断弁３３,３４を同様に開閉し、これによって燃料ガスＧを瞬間的にパイロットバーナ２に供給するものとなっている。そしてこのときに前記第１および第２の燃料ガス供給系２０,３０にそれぞれ流れる燃料ガスＧの流量を前述した流量計（熱式マイクロフローメータ）２９,３７にてそれぞれ検出し、検出したガス流量から上記安全遮断弁２３,２４,３３,３４の動作機能を確認するものとなっている。   Particularly in this combustion control system, the control device 4 changes the safety shut-off valves 23 and 24 in the first fuel gas supply system 20 from a fully closed state to a fully opened state immediately before executing pre-purge or simultaneously with the start of pre-purge. Further, the fuel gas G is instantaneously supplied to the gas burner 1 by opening and closing for about one second from the fully open state to the fully closed state. Simultaneously with the opening / closing control of the safety shut-off valves 23, 24, the safety shut-off valves 33, 34 in the second fuel gas supply system 30 are similarly opened / closed, whereby the fuel gas G is instantaneously supplied to the pilot burner 2. It has become. At this time, the flow rates of the fuel gas G flowing in the first and second fuel gas supply systems 20 and 30 are detected by the flow meters (thermal micro flow meters) 29 and 37, respectively, and the detected gas is detected. The operation function of the safety shut-off valves 23, 24, 33, 34 is confirmed from the flow rate.

具体的には制御装置４は、安全遮断弁２３,２４,３３,３４を瞬間的に開閉したときの最低流量と最大流量とをそれぞれ求めると共にその流量の変化特性を調べている。そして上記最低流量がゼロ（０）で燃料ガスの供給を確実に遮断し、またその最大流量がガスバーナ１およびパイロットバーナ２のそれぞれに要求されている最大ガス供給量であるか否かを確認することで前記安全遮断弁２３,２４,３３,３４がそれぞれ正常に動作するか否かを確認している。更に上記流量の変化特性、即ち、ガス流量が最小流量から最大流量に変化するまでの時間経過（時定数）、およびガス流量が最大流量から最小流量に変化するまでの時間経過（時定数）から前記各安全遮断弁２３,２４,３３,３４の動作応答特性を求めている。その後、制御装置４はプリパージ処理の実行期間を利用して、前述したように流量調整用ダンパー（コントロールモータ付きバタフライ弁）２６が正常に動作するか否か等の動作確認を行うものとなっている。   Specifically, the control device 4 obtains the minimum flow rate and the maximum flow rate when the safety shut-off valves 23, 24, 33, and 34 are opened and closed instantaneously, and examines the change characteristics of the flow rates. Then, the fuel gas supply is surely shut off when the minimum flow rate is zero (0), and whether the maximum flow rate is the maximum gas supply amount required for each of the gas burner 1 and the pilot burner 2 is confirmed. Thus, it is confirmed whether or not the safety shut-off valves 23, 24, 33, and 34 operate normally. Furthermore, from the above flow rate change characteristics, that is, the time lapse (time constant) until the gas flow rate changes from the minimum flow rate to the maximum flow rate, and the time lapse (time constant) until the gas flow rate changes from the maximum flow rate to the minimum flow rate. The operation response characteristics of the safety shut-off valves 23, 24, 33, and 34 are obtained. Thereafter, the control device 4 uses the pre-purge process execution period to confirm the operation of whether or not the flow rate adjusting damper (butterfly valve with control motor) 26 operates normally, as described above. Yes.

即ち、図２に燃焼システムにおける空気供給系１０および燃料ガス供給系２０,３０の動作安全確認の為の概略的な制御の流れを示し、また図３に制御動作の概略的なタイミング図を示すように、制御装置４においては燃焼起動指示が与えられたとき、先ずブロワモータ（送風機）３を起動する［ステップＳ１］。そしてブロワモータ３の作動後、プリパージを開始するに先立って、或いはプリパージの開始と同時に燃焼ガス供給系２０,３０を介して供給される燃料ガスＧの供給量（ガス流量）をチェックする［ステップＳ２］。この燃料ガス供給量（ガス流量）のチェックは、前述したように安全遮断弁２３,２４,３３,３４を瞬間的に開閉し［ステップＳ２ａ］、これによって通流するガス流量を検出し［ステップＳ２ｂ］、安全遮断弁２３,２４,３３,３４が正常に開閉動作して燃料ガスＧの供給遮断機能を確実に呈するか否かを確認する［ステップＳ２ｃ］。   That is, FIG. 2 shows a schematic control flow for confirming the operational safety of the air supply system 10 and the fuel gas supply systems 20 and 30 in the combustion system, and FIG. 3 shows a schematic timing chart of the control operation. Thus, in the control device 4, when the combustion start instruction is given, the blower motor (blower) 3 is first started [step S1]. Then, after the operation of the blower motor 3, before the start of the pre-purge or simultaneously with the start of the pre-purge, the supply amount (gas flow rate) of the fuel gas G supplied through the combustion gas supply systems 20 and 30 is checked [Step S2 ]. As described above, the fuel gas supply amount (gas flow rate) is checked by opening and closing the safety shut-off valves 23, 24, 33, and 34 instantaneously [Step S2a], thereby detecting the flow rate of gas flowing through [Step S2a]. S2b], it is confirmed whether or not the safety shut-off valves 23, 24, 33, and 34 are normally opened and closed to reliably exhibit the fuel gas G supply shut-off function [step S2c].

そしてプリパージを開始したならば［ステップＳ３］、先ず空気供給系１０を介して供給される空気Ａの供給量（風量）をチェックしてブロワモータ３の機能、ひいてはプリパージ機能の正常性を確認する［ステップＳ４］。そしてそのプリパージ処理が完了するまで［ステップＳ５］、このプリパージ期間を利用して前記空気供給系１０および燃料ガス供給系２０,３０にそれぞれ組み込まれた前述した流量調整用ダンパー２６等の各制御器の動作をそれぞれ確認する［ステップＳ６］。流量調整用ダンパー２６等の動作確認は、その駆動モータを作動させることによってダンパー弁が最小開度から最大開度まで可変制御されるか否かを調べることによってなされる。そしてこれらの各制御器の動作の正常性が確認された後、バーナ１を点火して燃焼制御を実行する［ステップＳ６］。この燃焼制御については、例えば特開平１０−１９２５３号公報等にて提唱されている制御手法を使えば十分である。またこのとき、例えば特開平１０−１９２５３号公報に開示されるように弁開度と検出ガス流量との関係をモニタする等して流量計２９,３４自体の機能を自己診断し、その正常性を確認することも有用である。   When the pre-purge is started [step S3], first, the supply amount (air volume) of the air A supplied via the air supply system 10 is checked to confirm the function of the blower motor 3, and thus the normality of the pre-purge function [ Step S4]. Until the pre-purge process is completed [step S5], each controller such as the above-described flow rate adjusting damper 26 incorporated in the air supply system 10 and the fuel gas supply systems 20 and 30, respectively, using this pre-purge period. Each operation is confirmed [step S6]. The operation of the flow adjusting damper 26 and the like is confirmed by examining whether or not the damper valve is variably controlled from the minimum opening to the maximum opening by operating the drive motor. After the normality of the operation of each controller is confirmed, the burner 1 is ignited and combustion control is executed [step S6]. For this combustion control, it is sufficient to use a control method proposed in, for example, Japanese Patent Laid-Open No. 10-19253. Further, at this time, as disclosed in, for example, Japanese Patent Laid-Open No. 10-19253, the function of the flow meters 29 and 34 themselves is self-diagnosed by monitoring the relationship between the valve opening degree and the detected gas flow rate, and the normality thereof. It is also useful to confirm.

かくしてこのように構成された燃焼システムによれば、プリパージの直前、またはプリパージの開始と同時に安全遮断弁２３,２４,３３,３４を短時間だけ開けて燃料ガス供給系２０,３０に燃料ガスＧを供給し、このときの燃料ガスＧの流量を燃料ガス供給系２０,３０にそれぞれ設けた流量計２９,３７にて検出することで、空気供給系１０とは独立に燃料ガス供給系２０,３０の動作安全性を確認することができる。従って従来のようにガス流量制御用ダンパーと風量調整ダンパーとを機械的にリンクした構成を採用しなくても燃焼開始に先立ってその動作安全確認を確実に、且つ的確に行うことができる。これ故、燃焼システムの構成の大幅な簡素化を図り得る等の効果が奏せられる。   Thus, according to the combustion system configured as described above, the safety shut-off valves 23, 24, 33, 34 are opened for a short time immediately before the pre-purge or simultaneously with the start of the pre-purge, and the fuel gas G is supplied to the fuel gas supply systems 20, 30. , And the flow rate of the fuel gas G at this time is detected by flow meters 29 and 37 provided in the fuel gas supply systems 20 and 30, respectively, so that the fuel gas supply system 20 and 30 operational safety can be confirmed. Therefore, it is possible to reliably and accurately check the operational safety prior to the start of combustion without adopting a configuration in which the gas flow rate control damper and the air volume adjustment damper are mechanically linked as in the prior art. For this reason, effects such as significant simplification of the configuration of the combustion system can be achieved.

また上述したようにプリパージの直前、またはプリパージの開始と同時に短時間だけ燃料ガスＧを供給しても、その微少量の燃料ガスＧはプリパージにより排気されるので、その後の燃焼動作の安全性に危惧を及ぼす虞がない。しかも燃料ガス供給系２０,３０に極短時間だけ微少量の燃料ガスＧを実際に流すことで、その動作確認を直接的に行うので信頼性の高い安全確認を行うことができる等、従来には全く期待することのできない効果が奏せられる。特に流路障害等に起因して燃料ガスＧの流れが悪くなっている状態等をも容易に検出することが可能となり、更には故障発生の予知を行うことも可能となる。   Further, as described above, even if the fuel gas G is supplied just for a short time immediately before the pre-purge or simultaneously with the start of the pre-purge, the minute amount of the fuel gas G is exhausted by the pre-purge. There is no risk of danger. In addition, since a small amount of fuel gas G is actually allowed to flow through the fuel gas supply systems 20 and 30 for a very short time, the operation can be confirmed directly, so that a highly reliable safety check can be performed. Can have effects you can't expect at all. In particular, it is possible to easily detect a state where the flow of the fuel gas G is deteriorated due to a flow path failure or the like, and it is possible to predict the occurrence of a failure.

尚、前述したように空気供給系１０および燃料ガス供給系２０,３０にそれぞれ流量計１４,２９,３７を組み込んで空気量（風量）およびガス供給量をそれぞれ検出する構成としておけば、その検出結果を利用して点火後の空気量とガス量とを比例制御した燃焼制御を安定に行うことも可能となる。また燃焼開始（点火）に伴う安全確認動作時毎に得られる検出データを集計すれば、燃料ガス源から供給される燃料ガスＧの供給圧力変動を監視することも可能となり、その情報を燃焼制御の校正データとして用いることも可能となる等の効果が奏せられる。更には複数の燃料ガス供給系のそれぞれを個別に安全確認することができるので、複数のメインバーナを備えた燃焼システムの安全確認に容易に適用することが可能となる。   As described above, if the air supply system 10 and the fuel gas supply systems 20 and 30 are respectively incorporated with the flow meters 14, 29 and 37 to detect the air amount (air amount) and the gas supply amount, respectively, the detection is performed. Using the result, it is possible to stably perform combustion control in which the amount of air and the amount of gas after ignition are proportionally controlled. If the detection data obtained at the time of the safety confirmation operation at the start of ignition (ignition) is totaled, it becomes possible to monitor the supply pressure fluctuation of the fuel gas G supplied from the fuel gas source, and this information is used for combustion control. It is possible to use it as calibration data for the above. Furthermore, since each of the plurality of fuel gas supply systems can be individually confirmed for safety, it can be easily applied to the safety confirmation of a combustion system including a plurality of main burners.

尚、本発明は上述した実施形態に限定されるものではない。例えば流量計としては熱式マイクロフローメータ以外のものを用いることも可能であるが、燃料ガスＧを短時間しか流さないので、その時間内に最大流量と最小流量とを略リアルタイムに計測が可能な高速タイプのものを用いることが望ましい。また実施形態として例示したコントロール弁リンケージ方式の燃焼設備だけではなく、図４(ａ)(ｂ)(ｃ)にそれぞれ示すようなブンゼンバーナ方式の燃焼設備、ベンチュリ方式の燃焼設備、均圧弁方式の燃焼設備にも同様に適用することができる。その他、本発明はその要旨を逸脱しない範囲で種々変形して実施することができる。   The present invention is not limited to the embodiment described above. For example, it is possible to use a flow meter other than a thermal micro flow meter. However, since the fuel gas G is allowed to flow for only a short time, the maximum flow rate and the minimum flow rate can be measured in that time. It is desirable to use a high-speed type. In addition to the control valve linkage type combustion facility exemplified as the embodiment, the Bunsen burner type combustion facility, the venturi type combustion facility, and the pressure equalizing valve type as shown in FIGS. 4 (a), (b) and (c), respectively. The same applies to combustion equipment. In addition, the present invention can be variously modified and implemented without departing from the scope of the invention.

本発明の一実施形態に係る燃焼システムの概略構成図。1 is a schematic configuration diagram of a combustion system according to an embodiment of the present invention. 図１に示す燃焼システムに適用して実施される燃焼設備の安全確認方法の概略的な処理手順を示す図。The figure which shows the rough process sequence of the safety confirmation method of the combustion installation implemented by applying to the combustion system shown in FIG. 図２に示す燃焼設備の安全確認方法の具体的な実施形態を示すタイミング図。The timing diagram which shows specific embodiment of the safety confirmation method of the combustion equipment shown in FIG. 本発明が適用可能な他の燃焼設備の例を示す図。The figure which shows the example of the other combustion equipment which can apply this invention.

符号の説明Explanation of symbols

１ メインバーナ
２ パイロットバーナ
３ 送風機（ブロワモータ）
４ 制御装置（コントローラ）
５ 火炎検知器
１０ 空気供給系
２０ 第１の燃料ガス供給系（メインバーナ用）
３０ 第２の燃料ガス供給系（パイロットバーナ用）
１３,２６ 流量調整用ダンパー
２３,２４,３３,３４ 安全遮断弁
１４,２９,３７ 流量計（マイクロフローメータ） 1 Main burner 2 Pilot burner 3 Blower (blower motor)
4 Controller (Controller)
5 Flame detector 10 Air supply system 20 First fuel gas supply system (for main burner)
30 Second fuel gas supply system (for pilot burner)
13,26 Damper for flow adjustment 23,24,33,34 Safety shut-off valve 14,29,37 Flow meter (micro flow meter)

Claims (6)

燃焼設備に組み込まれた燃焼器に空気と燃料ガスとを供給して上記燃料ガスを燃焼させるに先立って、前記燃焼設備内およびその排煙設備内をパージ処理すると共に、このパージ処理中に前記燃焼器への空気供給系および燃料ガス供給系にそれぞれ設けられた制御器の各動作機能をそれぞれ検査するに際し、
上記パージ処理の開始直前、または上記パージ処理の開始と同時に前記燃料ガス供給系に設けられた燃料ガス遮断弁を短時間だけ開放し、このときに前記燃焼器にそれぞれ供給される空気および燃料ガスの各流量を上記空気供給系および燃料ガス供給系にそれぞれ設けた流量計にて検出して上記各供給系の正常性をそれぞれ検査することを特徴とする燃焼設備の安全確認方法。 Prior to supplying air and fuel gas to a combustor incorporated in a combustion facility to burn the fuel gas, the inside of the combustion facility and the inside of the flue gas facility are purged. When inspecting each operation function of the controller respectively provided in the air supply system and the fuel gas supply system to the combustor,
The fuel gas shut-off valve provided in the fuel gas supply system is opened for a short time immediately before the start of the purge process or simultaneously with the start of the purge process, and the air and the fuel gas respectively supplied to the combustor at this time A method for confirming safety of a combustion facility, wherein each flow rate is detected by a flow meter provided in each of the air supply system and the fuel gas supply system, and the normality of each supply system is checked. 前記空気供給系に設けられた制御器は風量調整器であって、前記燃料ガス供給系に設けられた制御器は前記燃料ガス遮断弁とガス流量調整器とを含み、
前記各供給系にそれぞれ設けられる流量計は熱式マイクロフローセンサからなる請求項１に記載の燃焼設備の安全確認方法。 The controller provided in the air supply system is an air flow regulator, and the controller provided in the fuel gas supply system includes the fuel gas cutoff valve and a gas flow rate regulator,
The method for confirming safety of a combustion facility according to claim 1, wherein the flow meters provided in the respective supply systems are each composed of a thermal microflow sensor. 前記各流量計は、前記燃料ガス供給系に設けられた燃料ガス遮断弁を短時間だけ開放した際の最大流量および／または最小流量を求めるものである請求項１に記載の燃焼設備の安全確認方法。   2. The combustion facility safety check according to claim 1, wherein each of the flow meters obtains a maximum flow rate and / or a minimum flow rate when a fuel gas shut-off valve provided in the fuel gas supply system is opened for only a short time. Method. 燃焼設備に組み込まれた燃焼器と、この燃焼器に空気を供給する空気供給系と、上記燃焼器に燃料ガスを供給する燃料ガス供給系とを具備した燃焼システムであって、
上記空気供給系および燃料ガス供給系にそれぞれ組み込まれて空気および燃料ガスの各流量をそれぞれ検出する流量計と、
前記燃焼設備内およびその排煙設備内をパージ処理するに際して、少なくともパージ処理の直前またはパージ処理の開始と同時に前記燃料ガス供給系に設けられた燃料ガス遮断弁を短時間だけ開放すると共に、このときに前記燃焼器にそれぞれ供給される空気および燃料ガスの各流量を前記各流量計にて検出して前記各供給系の正常性をそれぞれ検査する安全確認手段と
を備えたことを特徴とする燃焼システム。 A combustion system comprising a combustor incorporated in a combustion facility, an air supply system for supplying air to the combustor, and a fuel gas supply system for supplying fuel gas to the combustor,
A flow meter that is incorporated in the air supply system and the fuel gas supply system, respectively, and detects each flow rate of air and fuel gas;
When purging the inside of the combustion facility and the smoke exhausting facility, at least immediately before the purge process or simultaneously with the start of the purge process, the fuel gas shut-off valve provided in the fuel gas supply system is opened for a short time, and this And safety confirmation means for detecting the flow rates of air and fuel gas supplied to the combustor from time to time by the flow meters and checking the normality of the supply systems, respectively. Combustion system. 前記各供給系にそれぞれ設けられる流量計は、熱式マイクロフローセンサからなる請求項４に記載の燃焼システム。   The combustion system according to claim 4, wherein each of the flow meters provided in each of the supply systems includes a thermal microflow sensor. 前記安全確認手段は、前記各供給系の正常性をそれぞれ検査した後、前記各供給系に組み込まれた複数の制御器の各動作機能をそれぞれ検査する動作確認機能を備えたものである請求項４に記載の燃焼システム。   The safety check means includes an operation check function for checking each operation function of a plurality of controllers incorporated in each supply system after checking the normality of each supply system. 5. The combustion system according to 4.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011094906A (en) * 2009-10-30 2011-05-12 Kobe Steel Ltd Device and method for monitoring combustion of heating furnace and combustion control system
JP2015129613A (en) * 2014-01-08 2015-07-16 アズビル株式会社 combustion control device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50157744U (en) * 1974-06-13 1975-12-26
JPH11351444A (en) * 1998-06-10 1999-12-24 Yamatake Corp Leakage of gas control valve inspection method and device
JP2001235146A (en) * 2000-02-22 2001-08-31 Yamatake Corp Combustion-controlling device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50157744U (en) * 1974-06-13 1975-12-26
JPH11351444A (en) * 1998-06-10 1999-12-24 Yamatake Corp Leakage of gas control valve inspection method and device
JP2001235146A (en) * 2000-02-22 2001-08-31 Yamatake Corp Combustion-controlling device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011094906A (en) * 2009-10-30 2011-05-12 Kobe Steel Ltd Device and method for monitoring combustion of heating furnace and combustion control system
JP2015129613A (en) * 2014-01-08 2015-07-16 アズビル株式会社 combustion control device

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