JPH1061941A - Device and method for alternate combustion control of heat storage type burner - Google Patents
Device and method for alternate combustion control of heat storage type burnerInfo
- Publication number
- JPH1061941A JPH1061941A JP8221384A JP22138496A JPH1061941A JP H1061941 A JPH1061941 A JP H1061941A JP 8221384 A JP8221384 A JP 8221384A JP 22138496 A JP22138496 A JP 22138496A JP H1061941 A JPH1061941 A JP H1061941A
- Authority
- JP
- Japan
- Prior art keywords
- combustion
- temperature
- fuel
- regenerative burner
- valve
- 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.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Regulation And Control Of Combustion (AREA)
- Control Of Combustion (AREA)
- Air Supply (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、蓄熱式バーナの交
番燃焼制御装置及びその方法に関し、詳しくは、蓄熱式
バーナの交番燃焼時に着火不良が発生した際に、着火不
良に対応し得る燃焼制御によって安全性を保つ蓄熱式バ
ーナの交番燃焼制御装置及びその方法に係るものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for alternating combustion of a regenerative burner, and more particularly, to a combustion control capable of coping with an ignition failure when an ignition failure occurs during alternating combustion of a regenerative burner. The present invention relates to an alternating combustion control device for a regenerative burner and a method for maintaining safety by the method.
【０００２】[0002]
【従来の技術】一般に、加熱炉に蓄熱式バーナを用いる
場合、一対の蓄熱式バーナが加熱炉内の炉壁にそれぞれ
互いに向かい合うように配置され、燃焼と燃焼排ガスの
排気（燃焼排ガスの顕熱に蓄積）を交互に行う交番燃焼
による燃焼方法が採られている。2. Description of the Related Art In general, when a regenerative burner is used in a heating furnace, a pair of regenerative burners are arranged on a furnace wall of the heating furnace so as to face each other, and combustion and exhaust of combustion exhaust gas (sensible heat of combustion exhaust gas) are performed. (Accumulation in the gas) is alternately performed.
【０００３】図６は、従来の加熱炉に蓄熱式バーナを用
いた燃焼装置の概要を示している。蓄熱式バーナ３は、
加熱炉１の互いに向かい合う炉壁２にそれぞれ装着され
ている。蓄熱式バーナ３は、炉壁２に設けられたバーナ
タイル３ａと、バーナタイル３ａに設けられた炉内側に
開口する空気ノズル３ｂと、空気ノズル３ｂに開口する
燃料ノズル８と、燃料ノズル８に隣接して設けられるパ
イロットバーナ９と、蓄熱体２０とから構成されてい
る。FIG. 6 shows an outline of a combustion apparatus using a regenerative burner in a conventional heating furnace. The regenerative burner 3
The heating furnace 1 is mounted on furnace walls 2 facing each other. The regenerative burner 3 includes a burner tile 3a provided on the furnace wall 2, an air nozzle 3b provided inside the furnace provided on the burner tile 3a, a fuel nozzle 8 opened on the air nozzle 3b, and a fuel nozzle 8 provided on the burner tile 3a. It is composed of a pilot burner 9 provided adjacently and a heat storage body 20.
【０００４】そして、蓄熱体２０の燃焼排ガスの出側に
温度検知器２１が設けられ、パイロットバーナ９に失火
検知装置１０が設けれている。燃料ノズル８には燃料遮
断弁７が設けられ、蓄熱式バーナ３に接続された配管に
空気遮断弁５及び排ガス遮断弁６が設けられている。空
気遮断弁５，排ガス遮断弁６及び燃料遮断弁７は制御装
置４からの制御信号によって制御されている。制御装置
４は、失火検知装置１０及び温度検知器２１からの出力
が入力されている。なお、空気流量制御弁，排ガス流量
制御弁，燃料流量制御弁は図示を省略した。[0004] A temperature detector 21 is provided on the outlet side of the combustion exhaust gas of the regenerator 20, and a misfire detection device 10 is provided on the pilot burner 9. The fuel nozzle 8 is provided with a fuel cutoff valve 7, and a pipe connected to the regenerative burner 3 is provided with an air cutoff valve 5 and an exhaust gas cutoff valve 6. The air cutoff valve 5, the exhaust gas cutoff valve 6, and the fuel cutoff valve 7 are controlled by control signals from the control device 4. The outputs from the misfire detection device 10 and the temperature detector 21 are input to the control device 4. The illustration of the air flow control valve, the exhaust gas flow control valve, and the fuel flow control valve is omitted.
【０００５】次に、従来の蓄熱式バーナの交番燃焼制御
方法について、図６，図７を参照して説明する。図７の
フローチャート図には、蓄熱式バーナが燃焼異常を発生
した際の燃焼制御方法が示されている。ステップＳ１で
は、一対の蓄熱式バーナ３に点火して交番燃焼を開始し
て、加熱炉１の炉内温度を上昇させる。その後、加熱炉
１は定常運転に移行する。ステップＳ２に進み、交番燃
焼を継続するか否かが判断され、継続しない場合は蓄熱
式バーナ３に供給される燃料を徐々に絞って交番燃焼を
終了させて、加熱炉１の運転を終了させる。交番燃焼を
継続する場合は、ステップＳ３に進む。ステップＳ３で
は、定期的に蓄熱式バーナ３の燃焼異常を監視し、失火
検知装置１０等によって燃焼異常を検出した場合は、ス
テップＳ４に進む。ステップＳ４では、燃焼異常が発生
した蓄熱式バーナ３の空気遮断弁５，排ガス遮断弁６及
び燃料遮断弁７を遮断して加熱炉１内への燃料及び燃焼
用空気の供給を停止する。Next, a conventional method for controlling alternating combustion of a regenerative burner will be described with reference to FIGS. The flowchart of FIG. 7 shows a combustion control method when a regenerative burner generates abnormal combustion. In step S1, the pair of regenerative burners 3 are ignited to start alternating combustion, and the temperature inside the heating furnace 1 is raised. Thereafter, the heating furnace 1 shifts to a steady operation. Proceeding to step S2, it is determined whether or not to continue the alternating combustion. If not, the fuel supplied to the regenerative burner 3 is gradually reduced to terminate the alternating combustion and terminate the operation of the heating furnace 1. . When the alternating combustion is to be continued, the process proceeds to step S3. In step S3, abnormal combustion of the regenerative burner 3 is periodically monitored, and if abnormal combustion is detected by the misfire detection device 10 or the like, the process proceeds to step S4. In step S4, the supply of fuel and combustion air into the heating furnace 1 is stopped by shutting off the air cutoff valve 5, the exhaust gas cutoff valve 6, and the fuel cutoff valve 7 of the regenerative burner 3 in which the combustion abnormality has occurred.
【０００６】次に、従来の蓄熱式バーナの異常燃焼を解
消する燃焼制御装置について、図６に基づき説明する。
先ず、交番燃焼について簡単に説明すると、一方の蓄熱
式バーナ３は、空気遮断弁５と燃料遮断弁７が開放さ
れ、燃料遮断弁７を介して燃料が供給されるとともに、
燃焼用空気が蓄熱体２０を通過する際に予熱されて炉内
に供給されて燃焼する。排ガス遮断弁６は遮断されて、
一定時間燃焼状態を維持する。他方の蓄熱式バーナ３
は、空気遮断弁５と燃料遮断弁７が遮断され、排ガス遮
断弁６は開放されている。排ガスが吸引され、燃焼排ガ
スが一定時間排出状態にあり、燃焼排ガスの顕熱が蓄熱
体２０に蓄積されている。このような状態を交互に繰り
返すことにより、エネルギ回収効率を高められている。Next, a conventional combustion control device for eliminating abnormal combustion of a regenerative burner will be described with reference to FIG.
First, the alternating combustion will be briefly described. In one regenerative burner 3, the air cutoff valve 5 and the fuel cutoff valve 7 are opened, and fuel is supplied via the fuel cutoff valve 7.
The combustion air is preheated when passing through the regenerator 20 and supplied to the furnace for combustion. The exhaust gas shutoff valve 6 is shut off,
Maintain the combustion state for a certain time. The other regenerative burner 3
The air shutoff valve 5 and the fuel shutoff valve 7 are shut off, and the exhaust gas shutoff valve 6 is open. The exhaust gas is sucked, the combustion exhaust gas is in a discharge state for a certain time, and the sensible heat of the combustion exhaust gas is accumulated in the heat storage unit 20. By alternately repeating such a state, the energy recovery efficiency is increased.
【０００７】このような交番燃焼では、一対の蓄熱式バ
ーナを交互に燃焼と排ガスの顕熱の蓄積を繰り返してお
り、炉内温度が、例えば８００℃以下の場合は、燃料と
燃焼用空気とが混合した加熱炉内に供給したとしても自
然着火温度以下であるので自己安定着火ができないため
に、パイロットバーナが必要である。パイロットバーナ
が失火している場合には点火不良が発生して、加熱炉内
に許容以上の未燃焼の燃料ガスが充満したり、燃料ガス
が炉外に排出され、加熱炉内及び外で爆発等による異常
燃焼が発生するおそれがあり、安全上の点で問題が発生
する。従って、加熱炉の炉内温度が自己安定着火温度
（自然着火温度）以下の場合は、失火検知装置の誤動
作、パイロットバーナの失火等によりパイロットバーナ
が使用できない状況下では、安全上の点からその蓄熱式
バーナによる燃焼を中止せざるを得ない。自己安定着火
温度が可能な８００℃以上の炉内温度になるまでは、そ
の蓄熱式バーナの空気遮断弁５、排ガス遮断弁６、燃料
遮断弁７を閉じ、炉内温度が自己安定着火温度以上にな
るまで、燃焼と蓄熱の動作は行われずに運転を停止した
状態となる。In such alternating combustion, a pair of regenerative burners alternately repeats combustion and accumulation of sensible heat of exhaust gas. When the furnace temperature is, for example, 800 ° C. or less, fuel and combustion air are exchanged. Even if the mixture is supplied into the heating furnace in which the gas is mixed, the self-stabilizing ignition cannot be performed because the temperature is lower than the natural ignition temperature, so that a pilot burner is required. If the pilot burner is misfired, ignition failure will occur and the heating furnace will be filled with unburned fuel gas more than allowable, or the fuel gas will be discharged outside the furnace and explode inside and outside the heating furnace. Abnormal combustion may occur due to such factors, and a problem may occur in terms of safety. Therefore, if the temperature inside the heating furnace is lower than the self-stable ignition temperature (spontaneous ignition temperature), if the pilot burner cannot be used due to malfunction of the misfire detection device, misfire of the pilot burner, etc. Combustion by the regenerative burner must be stopped. Until the self-stabilizing ignition temperature reaches the furnace temperature of 800 ° C. or higher, the air shutoff valve 5, exhaust gas shutoff valve 6, and fuel shutoff valve 7 of the regenerative burner are closed, and the furnace temperature is equal to or higher than the self-stabilizing ignition temperature Until the operation of combustion and heat storage is not performed, the operation is stopped.
【０００８】[0008]
【発明が解決しようとする課題】従来の蓄熱式バーナの
燃焼制御では、炉内温度が自己安定着火温度（例えば、
８００℃）以下の低い温度域にある場合、安全上の観点
から運転を停止する。正常な蓄熱式バーナの連続運転或
いは他の通常バーナによる燃焼によって加熱炉に温度を
上昇させる。異常が発生した蓄熱式バーナは燃焼及び排
ガスの吸引を停止して、蓄熱動作を停止しているため
に、燃焼を停止した蓄熱式バーナの蓄熱体は略常温に近
い温度になる。加熱炉内の温度が８００℃以上になった
時点で通常の交番燃焼を行った場合に、燃焼を停止した
蓄熱式バーナの蓄熱体に、８００℃以上の高温の排ガス
が吸引されるために、その蓄熱体に急峻な温度勾配が生
じて、過大な熱応力が蓄熱体に加わり、蓄熱体に割れを
引き起こす原因になる。In the conventional combustion control of a regenerative burner, the temperature in the furnace is set to a self-stable ignition temperature (for example,
If the temperature is in a low temperature range of 800 ° C. or lower, the operation is stopped from the viewpoint of safety. The temperature of the heating furnace is raised by continuous operation of a normal regenerative burner or combustion by another normal burner. Since the regenerative burner in which the abnormality has occurred stops the combustion and the suction of the exhaust gas, and stops the heat storage operation, the temperature of the regenerator of the regenerative burner in which the combustion is stopped is substantially equal to a normal temperature. When normal alternating combustion is performed when the temperature in the heating furnace becomes 800 ° C. or higher, the high-temperature exhaust gas of 800 ° C. or higher is sucked into the heat storage body of the regenerative burner that has stopped burning. A steep temperature gradient is generated in the heat storage body, and an excessive thermal stress is applied to the heat storage body, which causes a crack in the heat storage body.
【０００９】また、蓄熱体２０に破損が生じた場合、燃
焼用空気と排ガスの流路が狭まり、蓄熱体による圧力損
失が大きくなり、燃焼用空気の供給と排ガスの吸引を行
う吸引ブロアを駆動する電力消費が増大するおそれがあ
る。When the heat storage element 20 is damaged, the flow path of the combustion air and the exhaust gas is narrowed, the pressure loss by the heat storage element is increased, and the suction blower for supplying the combustion air and sucking the exhaust gas is driven. Power consumption may increase.
【００１０】本発明は、上述のような問題に鑑みなされ
たものであり、燃焼異常が発生したとしても安全な燃焼
制御できる蓄熱式バーナの交番燃焼制御装置及びその方
法を提供することを目的とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to provide an alternating combustion control device for a regenerative burner and a method thereof that can perform safe combustion control even if a combustion abnormality occurs. Is what you do.
【００１１】[0011]
【課題を解決するための手段】本発明は、上記課題を達
成するためになされたものであり、図１の機能ブロック
図を参照して説明する。請求項１の発明は、交番燃焼制
御手段２５ａによって蓄熱式バーナを交番燃焼する蓄熱
式バーナの燃焼制御装置に於いて、蓄熱式バーナの失火
を検出する失火検知手段２５ｃと、加熱炉内温度を検出
する温度検出手段２５ｂと、前記温度検出手段２５ｂか
らの出力が燃料の自然着火温度に達しているか否かを判
定する炉内温度判定手段２５ｄと、前記失火検知手段と
前記炉内温度判定手段２５ｄに基づいて、失火対象の蓄
熱式バーナの燃料遮断弁を作動させる燃焼遮断弁駆動手
段２５ｅと、を備えることを特徴とする蓄熱式バーナの
交番燃焼制御装置であり、蓄熱式バーナの失火を失火検
知手段２５ｃで検出して、炉内温度が自然着火温度に達
しているか否かによって失火対象の蓄熱式バーナの燃料
遮断弁１８を制御することにより、加熱炉の安全性を維
持し得る交番燃焼制御装置である。SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and will be described with reference to the functional block diagram of FIG. The invention according to claim 1 is a combustion control device for a regenerative burner that alternately burns a regenerative burner by an alternating combustion control unit 25a, wherein a misfire detection unit 25c for detecting a misfire of the regenerative burner, Temperature detecting means 25b for detecting, an in-furnace temperature determining means 25d for determining whether or not the output from the temperature detecting means 25b has reached a spontaneous ignition temperature of the fuel; the misfire detecting means; and the in-furnace temperature determining means. And a combustion shutoff valve driving means 25e for operating a fuel shutoff valve of the regenerative burner to be misfired on the basis of 25d. By controlling the fuel cutoff valve 18 of the regenerative burner to be misfired by detecting the misfire detection means 25c and determining whether the furnace temperature has reached the spontaneous ignition temperature, the heating furnace It is an alternating combustion control device capable of maintaining safety.
【００１２】又、請求項２の発明は、蓄熱式バーナの交
番燃焼制御方法に於いて、加熱炉内温度が燃焼用空気と
混合した燃料の自然着火温度以下であり、且つ失火検知
装置による失火検知又は失火検知装置の誤動作、或いは
パイロットバーナの失火等によって蓄熱式バーナが使用
不能となった場合に、使用不能の蓄熱式バーナの燃料遮
断弁は遮断し、空気遮断弁と排ガス遮断弁は交番燃焼時
と同様に燃焼用空気の供給と燃焼排ガスの吸引を行うよ
うに運転し、加熱炉内温度が自然着火温度以上に達した
時点で遮断状態の前記燃料遮断弁を開いて交番燃焼を行
うようにしたことを特徴とする蓄熱式バーナの交番燃焼
制御方法であり、蓄熱式バーナの失火を失火検知手段で
検出して、炉内温度が自然着火温度に達しているか否か
によって失火対象の蓄熱式バーナの燃料遮断弁を制御し
て、安全性が維持できる燃焼制御方法である。According to a second aspect of the present invention, in the method for controlling alternating combustion of a regenerative burner, the temperature in the heating furnace is equal to or lower than the spontaneous ignition temperature of the fuel mixed with the combustion air, and the misfire is detected by the misfire detection device. If the regenerative burner becomes unusable due to malfunction of the detection or misfire detection device, or misfire of the pilot burner, etc., the fuel shutoff valve of the unusable regenerative burner is shut off, and the air shutoff valve and the exhaust gas shutoff valve are alternated. As in the case of the combustion, the operation is performed so as to supply the combustion air and suck the combustion exhaust gas, and when the temperature in the heating furnace reaches the self-ignition temperature or more, the shut-off fuel cutoff valve is opened to perform the alternating combustion. An alternating combustion control method for a regenerative burner, wherein misfire of a regenerative burner is detected by a misfire detecting means, and a misfire target is determined based on whether or not the furnace temperature has reached a spontaneous ignition temperature. And controls the fuel shut-off valve of regenerative burner, a combustion control method for safety can be maintained.
【００１３】[0013]
【発明の実施の形態】以下、本発明に係る実施形態につ
いて、図面を参照して説明する。図２は、本発明に係る
蓄熱式バーナの交番燃焼制御装置の一実施形態を示す図
である。同図に於いて、加熱炉１の炉壁２に蓄熱体２０
を備える蓄熱式バーナ３が装着されており、通常、蓄熱
式バーナを用いた加熱炉では、一対の蓄熱式バーナを一
単位として燃焼動作を行い、加熱炉内容積に応じて複数
対の蓄熱式バーナが設けられる。蓄熱式バーナ３は、炉
壁２にバーナタイル１１が埋め込まれ、バーナタイル１
１に炉内側に開口する空気ノズル１２が設けられ、空気
ノズル１２内に燃料ノズル１３とパイロットバーナ３０
が開口している。温度検知器２１が燃焼排ガスの出側
と、加熱炉１内に温度検知器２７が設けられている。パ
イロットバーナ３０に隣接して失火検知装置３１が設け
られている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a view showing an embodiment of an alternating combustion control device for a regenerative burner according to the present invention. In the figure, a heat storage body 20 is placed on a furnace wall 2 of a heating furnace 1.
A regenerative burner 3 equipped with a regenerative burner is usually mounted. In a heating furnace using a regenerative burner, a pair of regenerative burners perform a combustion operation as one unit, and a plurality of pairs of regenerative burners are provided in accordance with the inner volume of the heating furnace. A burner is provided. The regenerative burner 3 has a burner tile 11 embedded in a furnace wall 2 and a burner tile 1.
1 is provided with an air nozzle 12 opening inside the furnace, and a fuel nozzle 13 and a pilot burner 30 are provided in the air nozzle 12.
Is open. The temperature detector 21 is provided on the outlet side of the combustion exhaust gas, and a temperature detector 27 is provided in the heating furnace 1. A misfire detection device 31 is provided adjacent to the pilot burner 30.
【００１４】燃料ノズル１３は燃料遮断弁１８に接続さ
れ、燃料流量計２３を介して燃料流量制御弁１９に接続
されている。蓄熱式バーナ３に配管が接続され、分岐し
た配管の一方に空気遮断弁１４が設けられ、分岐した他
方の配管に排ガス遮断弁１６が設けられている。空気遮
断弁１４は空気流量計２２を介して空気流量制御弁１５
が接続され、排ガス遮断弁１６は排ガス流量計２４を介
して排ガス流量制御弁１７が接続され、排ガス吸引ブロ
ワ２６に接続されている。The fuel nozzle 13 is connected to a fuel cutoff valve 18, and is connected to a fuel flow control valve 19 via a fuel flow meter 23. A pipe is connected to the regenerative burner 3, an air cutoff valve 14 is provided on one of the branched pipes, and an exhaust gas cutoff valve 16 is provided on the other branched pipe. The air cutoff valve 14 is connected to the air flow control valve 15 via the air flow meter 22.
The exhaust gas cutoff valve 16 is connected to an exhaust gas flow control valve 17 via an exhaust gas flow meter 24, and is connected to an exhaust gas suction blower 26.
【００１５】制御装置２５には、演算手段と制御手段と
制御プログラムが書き込まれた記憶装置とが設けられて
いる。制御装置２５には加熱炉１内の温度を検出する温
度検知器２７、蓄熱式バーナ３の燃焼排ガスの出側の温
度を測定する温度検知器２１、空気流量計２２、燃料流
量計２３、及び排ガス流量計２４からの出力が入力さ
れ、且つ、制御装置２５からの制御信号に基づいて、空
気遮断弁１４、空気流量制御弁１５、排ガス遮断弁１
６、排ガス流量制御弁１７、燃料遮断弁１８、及び燃料
流量制御弁１９が制御されている。The control device 25 is provided with arithmetic means, control means, and a storage device in which a control program is written. The control device 25 includes a temperature detector 27 for detecting the temperature in the heating furnace 1, a temperature detector 21 for measuring the temperature of the outlet side of the combustion exhaust gas of the regenerative burner 3, an air flow meter 22, a fuel flow meter 23, and An output from the exhaust gas flow meter 24 is input, and based on a control signal from the control device 25, the air cutoff valve 14, the air flow control valve 15, the exhaust gas cutoff valve 1
6. The exhaust gas flow control valve 17, the fuel cutoff valve 18, and the fuel flow control valve 19 are controlled.
【００１６】次に、本発明に係る交番燃焼制御方法の実
施形態について、図３のフローチャート図に基づいて説
明する。同図に於いて、ステップＳ１は加熱炉１に設け
られた一対の蓄熱式バーナ３を交番燃焼させる工程であ
り、一対の蓄熱式バーナ３が制御装置２５の記憶装置に
書き込まれた制御プログラムに基づいて交番燃焼させる
工程である。先に説明したが、交番燃焼は一方の蓄熱式
バーナを燃焼状態にし、他方の蓄熱式バーナを排ガスの
排出、すなわち、排ガスによる顕熱によって蓄熱体を予
熱しながら排ガスを炉外に排出する状態とする。これら
の状態を一定時間で交互に切り換えながら繰り返す燃焼
方法である。Next, an embodiment of an alternating combustion control method according to the present invention will be described with reference to the flowchart of FIG. In this figure, step S1 is a step of alternatingly burning a pair of regenerative burners 3 provided in the heating furnace 1. The pair of regenerative burners 3 is stored in a storage device of the control device 25 according to a control program. This is a step of performing alternating combustion based on the above. As described above, in the alternating combustion, one regenerative burner is set to a combustion state, and the other regenerative burner discharges exhaust gas, that is, exhaust gas is discharged outside the furnace while preheating the regenerator by sensible heat of the exhaust gas. And This is a combustion method in which these states are repeated while being alternately switched over a certain period of time.
【００１７】ステップＳ２は、交番燃焼を継続するか否
かを判断する工程であり、加熱炉１の運転を中止する場
合は、燃料流量制御弁１９を作動させて、燃料供給量を
絞りながら交番燃焼を終了させる。一方、交番燃焼を継
続する場合は、ステップＳ３に進み、蓄熱式バーナが失
火等の燃焼異常を発生しているか否かを判断して、燃焼
異常が発生していない場合は、ステップＳ１に戻り、燃
焼異常が発生した場合は、ステップＳ４に進む。ステッ
プＳ４では、炉内温度が燃料と燃焼用空気との混合ガス
が自然着火する温度（自然着火温度又は自己安定着火温
度）に達しているか否かを判断する。炉内温度と自然着
火温度とが、炉内温度≦自然着火温度の関係にある場合
は、ステップＳ５に進み、異常が発生した蓄熱式バーナ
の燃料遮断弁１８を遮断する。一方、異常が発生した蓄
熱式バーナの空気遮断弁１４、排ガス遮断弁１６は交番
燃焼のサイクルで開閉動作を継続する。Step S2 is a step of judging whether or not to continue the alternating combustion. When the operation of the heating furnace 1 is stopped, the fuel flow control valve 19 is operated to reduce the fuel supply amount. Terminate combustion. On the other hand, if the alternating combustion is to be continued, the process proceeds to step S3, where it is determined whether or not the regenerative burner has caused a combustion abnormality such as misfire. If no combustion abnormality has occurred, the process returns to step S1. If a combustion abnormality has occurred, the process proceeds to step S4. In step S4, it is determined whether or not the furnace temperature has reached the temperature at which the mixed gas of the fuel and the combustion air spontaneously ignites (natural ignition temperature or self-stable ignition temperature). If the furnace temperature and the spontaneous ignition temperature have a relationship of furnace temperature ≦ spontaneous ignition temperature, the process proceeds to step S5, and the fuel shut-off valve 18 of the regenerative burner in which the abnormality has occurred is shut off. On the other hand, the air shutoff valve 14 and the exhaust gas shutoff valve 16 of the regenerative burner in which an abnormality has occurred continue to open and close in an alternating combustion cycle.
【００１８】本実施形態に蓄熱式バーナの交番燃焼制御
装置及びその方法では、加熱炉内に２個以上の蓄熱式バ
ーナが配置されており、加熱炉の炉内温度（炉温）が燃
焼用空気と混合した燃料の自然着火温度（自己安定着火
温度）以下、例えば８００℃以下の温度域において、失
火検知装置３１による失火検出及び失火検知装置３１の
誤動作、パイロットバーナが使用できなる等の蓄熱式バ
ーナ及びその周辺機器の異常が発生した場合、安全上の
点から燃焼用空気と混合した燃料が自己安定着火が可能
な８００℃以上の炉温になるまで蓄熱式バーナ３の燃料
遮断弁１８を閉じて燃料の供給を遮断して非燃焼状態と
する。燃焼用空気と炉内の排ガスの炉外への吸引は、他
の正常な蓄熱式バーナと同様に実施する。それによっ
て、蓄熱体２０は排ガスの顕熱が蓄積され、燃焼を停止
した蓄熱式バーナ３の蓄熱体２０は熱せられている。炉
温が自己安定着火温度以上となった時点で、燃料遮断弁
１８を開放して、正常な交番燃焼を開始した際に、蓄熱
体２０は熱せられており、急激な温度勾配が発生するの
を防止し得るので、蓄熱体２０が急激な熱応力による熱
衝撃によって割れが発生するのを防止することができ
る。In the alternating-current combustion control apparatus and method for a regenerative burner according to the present embodiment, two or more regenerative burners are arranged in a heating furnace, and the temperature (furnace temperature) in the furnace of the heating furnace is set to a value for combustion. Heat storage such as misfire detection by the misfire detection device 31, malfunction of the misfire detection device 31, and failure to use the pilot burner in a temperature range of not more than a natural ignition temperature (self-stable ignition temperature) of fuel mixed with air, for example, 800 ° C or less. When an abnormality occurs in the burner and its peripheral devices, the fuel shut-off valve 18 of the regenerative burner 3 is operated from the point of safety until the fuel mixed with the combustion air reaches a furnace temperature of 800 ° C. or higher at which self-stabilization ignition is possible. Is closed to shut off the supply of fuel to bring it into a non-combustion state. The suction of the combustion air and the exhaust gas from the furnace to the outside of the furnace is performed in the same manner as other normal regenerative burners. Thereby, the heat storage body 20 stores the sensible heat of the exhaust gas, and the heat storage body 20 of the heat storage type burner 3 that has stopped burning is heated. At the time when the furnace temperature becomes equal to or higher than the self-stable ignition temperature, when the fuel cutoff valve 18 is opened to start normal alternating combustion, the heat storage body 20 is heated, and a sharp temperature gradient occurs. Therefore, it is possible to prevent the heat storage body 20 from cracking due to thermal shock due to rapid thermal stress.
【００１９】次に、図４，図５を参照して、従来例と本
発明と交番燃焼制御による相違を示した図ある。図４
（ａ）は本発明による効果を検証するための蓄熱体の温
度測定点を示す図であり、図４（ｂ）は蓄熱体の表層部
温度と時間の関係を示している。図５（ａ）は本発明に
よる効果を検証するための蓄熱体の燃焼排ガスの入出力
側の温度測定点を示す図であり、図５（ｂ）は蓄熱体の
表層部温度勾配と時間の関係を示している。Next, with reference to FIGS. 4 and 5, there is shown a difference between the conventional example, the present invention, and the alternating combustion control. FIG.
(A) is a diagram showing the temperature measurement points of the heat storage body for verifying the effect of the present invention, and FIG. 4 (b) shows the relationship between the surface layer temperature of the heat storage body and time. FIG. 5 (a) is a diagram showing temperature measurement points on the input and output sides of the combustion exhaust gas of the regenerator for verifying the effect of the present invention, and FIG. 5 (b) shows the temperature gradient of the surface layer of the regenerator and the time. Shows the relationship.
【００２０】図４の（イ）は従来の蓄熱体の表層部温度
の変化を示し、（ロ）は本発明の蓄熱体の表層部温度の
変化を示している。図４の（イ）では炉温が８００℃に
達した時点で空気遮断弁１４、排ガス遮断弁１６、及び
燃料遮断弁１８を作動させた場合であり、蓄熱体表層部
の急激な温度上昇があることを示しており、それに対し
て、（ロ）は燃料遮断弁１のみを遮断した本実施形態の
場合であり、燃料遮断弁１８が遮断した状態であっても
温度上昇が滑らかな温度上昇カーブとなっており、炉温
が８００℃以上になった時点で燃料遮断弁１８を開放し
て自然着火温度による燃焼を開始したとしても急激な温
度変動は発生しないので蓄熱体２０に急激な熱応力が加
わらないことを示している。FIG. 4A shows a change in the surface layer temperature of the conventional heat storage element, and FIG. 4B shows a change in the surface layer temperature of the heat storage element of the present invention. FIG. 4A shows a case in which the air shutoff valve 14, the exhaust gas shutoff valve 16, and the fuel shutoff valve 18 are operated when the furnace temperature reaches 800 ° C. In contrast, (b) shows the case of the present embodiment in which only the fuel cutoff valve 1 is shut off, and the temperature rise is smooth even when the fuel cutoff valve 18 is shut off. Even if the fuel cut-off valve 18 is opened to start combustion at the spontaneous ignition temperature when the furnace temperature reaches 800 ° C. or higher, no rapid temperature fluctuation occurs, This indicates that no stress is applied.
【００２１】又、図５の（イ）は従来の蓄熱体の表層部
温度勾配と時間の関係を示し、同図の（ロ）は本発明の
蓄熱体の表層部温度勾配と時間の関係を示し、温度勾配
は流体の流れる方向の蓄熱体の長さをＸとし、その単位
長さ（１／ｍ）をｄＸとして温度勾配を示した。同図の
（イ）では炉温度が８００℃で達した時点で空気遮断弁
１４、排ガス遮断弁１６、及び燃料遮断弁１８を作動さ
せて交番燃焼を開始した場合であり、蓄熱体表層部の温
度勾配が急峻であるのに対して、本実施形態では、異常
時に燃料遮断弁１のみを遮断した交番燃焼させた場合で
あり、炉温が８００℃になった時点で、燃料遮断弁１８
を開放して交番燃焼を開始した場合は、（ロ）に示すよ
うに、温度勾配が滑らかであり、異常な熱応力が蓄熱体
に加わらないことを示している。FIG. 5 (a) shows the relationship between the surface layer temperature gradient of the conventional heat storage element and time, and FIG. 5 (b) shows the relation between the surface layer temperature gradient and time of the heat storage element of the present invention. The temperature gradient was represented by X, where X is the length of the heat storage body in the direction in which the fluid flows, and dX is the unit length (1 / m). FIG. 5A shows a case in which the air shutoff valve 14, the exhaust gas shutoff valve 16, and the fuel shutoff valve 18 are operated to start alternating combustion when the furnace temperature reaches 800 ° C. In contrast to the steep temperature gradient, the present embodiment is a case where the fuel is alternately burned with only the fuel cutoff valve 1 shut off at the time of abnormality, and when the furnace temperature reaches 800 ° C., the fuel cutoff valve 18
In the case of starting the alternating combustion by opening the heat storage, as shown in (b), the temperature gradient is smooth, indicating that abnormal thermal stress is not applied to the heat storage body.
【００２２】無論、炉内温度は、加熱炉内に設けた温度
検出器で検出してもよいが、蓄熱式バーナの排ガス出側
に設けた温度検出器によって炉内温度を想定してもよい
ことは明らかである。Of course, the furnace temperature may be detected by a temperature detector provided in the heating furnace, but the furnace temperature may be assumed by a temperature detector provided on the exhaust gas discharge side of the regenerative burner. It is clear.
【００２３】[0023]
【発明の効果】以上説明したように、本発明によれば、
蓄熱式バーナの交番燃焼では安全のために停止した蓄熱
式バーナを、加熱炉の炉内温度が自然着火温度に達した
時点で燃料を供給して交番燃焼を開始したとしても、蓄
熱体の割れの発生を防止することができる利点がある。As described above, according to the present invention,
Even if the regenerative burner, which was stopped for safety in the alternating combustion of the regenerative burner, was supplied for fuel when the furnace temperature of the heating furnace reached the spontaneous ignition temperature to start the alternating combustion, even if the regenerative burner started There is an advantage that the occurrence of the occurrence can be prevented.
【００２４】又、本発明によれば、蓄熱体の長寿命化が
図られるので、コスト低減がなし得る。更に、蓄熱体の
割れによる燃焼用空気及び排ガス通過時の圧力損失の増
加に伴う吸引ブロワの電力損失の増加を防止できるとと
もに、加熱炉のエネルギ回収の高効率維持に寄与する利
点がある。Further, according to the present invention, the life of the heat storage body can be extended, so that the cost can be reduced. Further, there is an advantage that it is possible to prevent an increase in power loss of the suction blower due to an increase in pressure loss when the combustion air and the exhaust gas pass due to cracks in the heat storage body, and to contribute to maintaining high efficiency of energy recovery of the heating furnace.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明に係る蓄熱式バーナの交番燃焼装置の機
能ブロック図である。FIG. 1 is a functional block diagram of an alternating combustion device of a regenerative burner according to the present invention.
【図２】本発明に係る蓄熱式バーナの交番燃焼装置の一
実施形態を示す図である。FIG. 2 is a view showing an embodiment of an alternating combustion device for a regenerative burner according to the present invention.
【図３】本発明に係る蓄熱式バーナの燃焼制御方法の一
実施形態を示すフローチャート図である。FIG. 3 is a flowchart illustrating an embodiment of a combustion control method for a regenerative burner according to the present invention.
【図４】本発明と従来例の蓄熱体の表層部温度の変化を
比較して示した図である。FIG. 4 is a diagram showing a comparison between changes in the surface layer temperature of a heat storage body of the present invention and a conventional heat storage body.
【図５】本発明と従来例の蓄熱体の表層部温度勾配の変
化を示す図である。FIG. 5 is a diagram showing a change in a surface layer temperature gradient of a heat storage body according to the present invention and a conventional example.
【図６】従来の蓄熱式バーナの交番燃焼装置の一例を示
す図である。FIG. 6 is a view showing an example of a conventional regenerative burner alternating combustion device.
【図７】従来の蓄熱式バーナの交番燃焼方法の一例を示
すフローチャート図である。FIG. 7 is a flowchart showing an example of a conventional regenerative burner alternating combustion method.
１ 加熱炉 ２ 炉壁 ３ 蓄熱式バーナ １１ バーナタイル １２ 空気ノズル １３ 燃料ノズル １４ 空気遮断弁 １５ 空気流量制御弁 １６ 排ガス遮断弁 １７ 排ガス流量制御弁 １８ 燃料遮断弁 １９ 燃料流量制御弁 ２０ 蓄熱体 ２１，２７ 温度検知器 ２２ 空気流量計 ２３ 燃料流量計 ２４ 排ガス流量計 ２５ 制御装置 ２６ 排ガス吸引ブロワ ３０ パイロットバーナ ３１ 失火検知装置 Reference Signs List 1 heating furnace 2 furnace wall 3 regenerative burner 11 burner tile 12 air nozzle 13 fuel nozzle 14 air cutoff valve 15 air flow control valve 16 exhaust gas cutoff valve 17 exhaust gas flow control valve 18 fuel cutoff valve 19 fuel flow control valve 20 heat storage element 21 , 27 Temperature detector 22 Air flow meter 23 Fuel flow meter 24 Exhaust gas flow meter 25 Controller 26 Exhaust gas suction blower 30 Pilot burner 31 Misfire detector
Claims (2)
て、 蓄熱式バーナの失火を検出する失火検知手段と、 加熱炉内温度を検出する温度検出手段と、 前記温度検出手段からの出力が燃料の自然着火温度に達
しているか否かを判定する炉内温度判定手段と、 前記失火検知手段と前記炉内温度判定手段に基づいて、
失火対象の蓄熱式バーナの燃料遮断弁を作動させる燃焼
遮断弁駆動手段と、 を備えることを特徴とする蓄熱式バーナの交番燃焼制御
装置。1. An alternating combustion control device for a regenerative burner, wherein misfire detecting means for detecting misfire of the regenerative burner, temperature detecting means for detecting a temperature in the heating furnace, and an output from the temperature detecting means. A furnace temperature determining unit for determining whether or not a spontaneous ignition temperature of the fuel has been reached, based on the misfire detecting unit and the furnace temperature determining unit,
A combustion shutoff valve driving means for operating a fuel shutoff valve of the regenerative burner to be misfired; and an alternating combustion control device for the regenerative burner.
て、 加熱炉内温度が燃焼用空気と混合した燃料の自然着火温
度以下であり、且つ失火検知装置による失火検知又は失
火検知装置の誤動作、或いはパイロットバーナの失火等
によって蓄熱式バーナが使用不能となった場合に、使用
不能の蓄熱式バーナの燃料遮断弁は遮断し、空気遮断弁
と排ガス遮断弁は交番燃焼時と同様に燃焼用空気の供給
と燃焼排ガスの吸引を行うように運転し、加熱炉内温度
が自然着火温度以上に達した時点で遮断状態の前記燃料
遮断弁を開いて交番燃焼を行うようにしたことを特徴と
する蓄熱式バーナの交番燃焼制御方法。2. A method for controlling alternating combustion in a regenerative burner, wherein the temperature in the heating furnace is equal to or lower than the spontaneous ignition temperature of fuel mixed with combustion air, and misfire detection by the misfire detection device or malfunction of the misfire detection device. If the regenerative burner becomes unusable due to misfire of the pilot burner, etc., the fuel shut-off valve of the unusable regenerative burner is shut off, and the air shut-off valve and the exhaust gas shut-off valve are used for combustion in the same manner as during alternating combustion. It is operated so as to supply air and suck combustion exhaust gas, and at the time when the temperature in the heating furnace reaches the self-ignition temperature or more, the fuel cutoff valve in a shut-off state is opened to perform alternating combustion. Combustion control method for regenerative burners.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8221384A JPH1061941A (en) | 1996-08-22 | 1996-08-22 | Device and method for alternate combustion control of heat storage type burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8221384A JPH1061941A (en) | 1996-08-22 | 1996-08-22 | Device and method for alternate combustion control of heat storage type burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1061941A true JPH1061941A (en) | 1998-03-06 |
Family
ID=16765939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8221384A Pending JPH1061941A (en) | 1996-08-22 | 1996-08-22 | Device and method for alternate combustion control of heat storage type burner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1061941A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006284154A (en) * | 2005-04-05 | 2006-10-19 | Nippon Steel Corp | Combustion-zone combustion control method for heating furnace with heat storage combustion burner |
| CN100454182C (en) * | 2006-06-13 | 2009-01-21 | 中铁宝桥股份有限公司 | High manganese steel frog heat treating system and heat treating process |
-
1996
- 1996-08-22 JP JP8221384A patent/JPH1061941A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006284154A (en) * | 2005-04-05 | 2006-10-19 | Nippon Steel Corp | Combustion-zone combustion control method for heating furnace with heat storage combustion burner |
| CN100454182C (en) * | 2006-06-13 | 2009-01-21 | 中铁宝桥股份有限公司 | High manganese steel frog heat treating system and heat treating process |
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