JPH0978123A - Heating furnace, heat-storage type combustion device and combustion method - Google Patents

Heating furnace, heat-storage type combustion device and combustion method

Info

Publication number
JPH0978123A
JPH0978123A JP7230183A JP23018395A JPH0978123A JP H0978123 A JPH0978123 A JP H0978123A JP 7230183 A JP7230183 A JP 7230183A JP 23018395 A JP23018395 A JP 23018395A JP H0978123 A JPH0978123 A JP H0978123A
Authority
JP
Japan
Prior art keywords
combustion
furnace
temperature
heating furnace
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP7230183A
Other languages
Japanese (ja)
Other versions
JP3341542B2 (en
Inventor
Taketo Sasaki
健人 佐々木
Shinichiro Fukushima
信一郎 福嶋
Takeshi Tada
健 多田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP23018395A priority Critical patent/JP3341542B2/en
Publication of JPH0978123A publication Critical patent/JPH0978123A/en
Application granted granted Critical
Publication of JP3341542B2 publication Critical patent/JP3341542B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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

Abstract

PROBLEM TO BE SOLVED: To obtain a heating furnace whose temp. distribution can be uniformized and setting place is not restricted, a heat-storage type combustion device and a combustion method. SOLUTION: Nozzles 3 for feeding fuel and heat-storage type alternate combustion burners 4 are arranged at both side walls of a heating furnace 1, and plural air nozzles 5 providing heat-storage bodies 6 are arranged at the upper part 2a and the lower part 2b of the heating furnace 1, and the heat-storage type combustion device, in which supply of the combustion air through the air nozzles 5 and discharge of the combustion exhaust gas are alternately changed over so as to burn the fuel in the heating furnace, is provided. Since the heat-storage bodies are arranged at the upper part 2a and the lower part 2b of the heat furnace 1, this heating furnace has little projection in the side direction of the heat-storage bodies 6 and little restriction of the setting area.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、加熱炉、蓄熱式燃
焼装置及び燃焼方法に関し、詳しくは、鉄鋼業では加熱
炉、均熱炉、熱処理炉、鍛造業では加熱炉、均熱炉、及
び鋳造業では溶解炉などが主に用いられており、これら
の業種に用いられる炉を加熱炉と総称するものとし、加
熱炉とその蓄熱式燃焼装置及びその燃焼方法に係るもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating furnace, a heat storage type combustion apparatus and a combustion method, and more specifically, a heating furnace, a soaking furnace, a heat treatment furnace in the steel industry, a heating furnace, a soaking furnace in the forging industry, and Melting furnaces and the like are mainly used in the casting industry, and the furnaces used in these industries are collectively referred to as heating furnaces, and relate to the heating furnace, its regenerative combustion device, and its combustion method.

【０００２】[0002]

【従来の技術】図９は、従来の蓄熱式交番燃焼バーナ装
置を備える加熱炉の一例について説明する。なお、図９
（ａ），（ｂ）はその加熱炉の縦及び横方向の断面図を
示している。2. Description of the Related Art FIG. 9 illustrates an example of a heating furnace equipped with a conventional regenerative type alternating combustion burner device. Note that FIG.
(A), (b) has shown the cross-sectional view of the vertical and horizontal direction of the heating furnace.

【０００３】図９（ａ），（ｂ）に於いて、加熱炉２０
はその燃焼装置としてバーナと蓄熱体２５とを組み合わ
せた蓄熱式バーナ２１ａ〜２１ｄが用いられ、加熱炉に
蓄熱式バーナが対に設けられ、交互に燃焼と排ガスの排
出がなされ、２３は炎、２４は燃焼排ガスの排出方向を
示し、Ｃは鋼板を示している。蓄熱式交番燃焼バーナ装
置では、一方の蓄熱式バーナ２１ａから外気と燃料を吸
入して炉内に噴射されて燃焼させ、他方の蓄熱式バーナ
２１ｂから高温の燃焼排ガスを排出している。燃焼排ガ
ス２４が蓄熱式バーナ２１ｂの蓄熱体２５を通過する際
に、燃焼排ガスの顕熱を蓄熱体２５に蓄積する。一対の
蓄熱式バーナの一方が約３０秒程度燃焼した後に、燃焼
排ガスを排出していた他方の蓄熱式バーナは燃焼を開始
し、消火した蓄熱式バーナは燃焼排ガスを排出する。こ
のように一対の蓄熱式バーナが燃焼と排ガス排出の動作
を交互に繰り返して高い熱回収率と高温予熱による燃焼
を可能にしている。In FIGS. 9A and 9B, the heating furnace 20 is used.
Is a heat storage type burner 21a to 21d that is a combination of a burner and a heat storage body 25 is used as the combustion device, the heat storage type burner is provided in a pair in the heating furnace, combustion and exhaust gas are alternately emitted, and 23 is a flame, Reference numeral 24 indicates the discharge direction of combustion exhaust gas, and C indicates a steel plate. In the heat storage type alternating combustion burner device, the outside air and the fuel are sucked from one heat storage type burner 21a, injected into the furnace for combustion, and the high temperature combustion exhaust gas is discharged from the other heat storage type burner 21b. When the combustion exhaust gas 24 passes through the heat storage body 25 of the regenerative burner 21b, the sensible heat of the combustion exhaust gas is stored in the heat storage body 25. After one of the pair of heat storage burners burns for about 30 seconds, the other heat storage burner that has discharged the combustion exhaust gas starts combustion, and the extinguished heat storage heat burner discharges the combustion exhaust gas. In this way, the pair of regenerative burners alternately repeat the operations of combustion and exhaust gas discharge to enable combustion with a high heat recovery rate and high temperature preheating.

【０００４】このような加熱炉では、蓄熱体に蓄積され
た熱によって燃焼空気の予熱温度が自然着火温度以上
（例えば、燃焼ガスにより異なるが８００℃以上の温
度）になると、燃料と空気を混合しなくとも燃焼が安定
することが知られている。また、加熱炉では蓄熱式交番
燃焼バーナ装置を導入することにより加熱炉内の温度を
均一化しようとする傾向にある。更に、近年では、燃焼
排ガス中の窒素酸化物（ＮＯ2 ）濃度の低下が要求され
ており、従来の蓄熱式交番燃焼バーナ装置のように燃料
と空気を混合して燃焼を行う方式ではなく、燃料と空気
を分離して供給して燃焼反応を行うことにより、燃焼反
応を遅らせて排ガス中のＮＯ2 濃度を低下させようとす
る傾向にある。しかし、蓄熱式バーナは蓄熱体の容積が
大きく設置場所に制約を受ける場合がある。In such a heating furnace, when the preheating temperature of the combustion air becomes equal to or higher than the spontaneous ignition temperature due to the heat accumulated in the heat storage body (for example, the temperature is 800 ° C. or higher although it depends on the combustion gas), the fuel and air are mixed. It is known that combustion is stable without it. Further, in the heating furnace, there is a tendency to try to make the temperature in the heating furnace uniform by introducing a regenerative alternating combustion burner device. Further, in recent years, it has been required to reduce the concentration of nitrogen oxides (NO 2 ) in the combustion exhaust gas, and it is not a method of performing combustion by mixing fuel and air as in the conventional heat storage type alternating combustion burner device, There is a tendency to delay the combustion reaction and lower the NO 2 concentration in the exhaust gas by separating the fuel and air and supplying them to carry out the combustion reaction. However, the regenerative burner has a large volume of regenerator and may be restricted in its installation location.

【０００５】[0005]

【発明が解決しようとする課題】従来の蓄熱式交番燃焼
バーナ装置を備える加熱炉では、交番燃焼方式であるた
めに、図９（ｂ）から明らかなように、一方のバーナ２
１ａが燃焼状態にある場合、他方のバーナ２１ｂは消火
状態となり、燃焼排ガスを吸引している。従って、加熱
炉に設置された蓄熱式交番燃焼バーナ装置の半分のバー
ナは燃焼しているが、他の半分のバーナは燃焼排ガスの
顕熱を蓄熱体に蓄積して燃焼空気の予熱に寄与するもの
の直接燃焼には関与していないことになる。これは、蓄
熱式交番燃焼バーナ装置の蓄熱式バーナと蓄熱体を具備
しない通常のバーナとを比較した場合、交番燃焼方式に
よる蓄熱式バーナではその蓄熱式バーナと同じ燃焼容量
の通常の燃焼方式によるバーナの２倍以上の設置個数及
び設置場所を必要とすることを意味している。即ち、設
備費の増大をもたらす要因となる欠点がある。また、加
熱炉を設置する場所に物理的な制約がある場合には、加
熱炉に蓄熱式交番燃焼バーナ装置を採用することが困難
になるおそれがある。Since the heating furnace provided with the conventional regenerative type alternating combustion burner device is of the alternating combustion type, as is apparent from FIG. 9B, one burner 2 is used.
When 1a is in a combustion state, the other burner 21b is in a fire extinguishing state and sucks combustion exhaust gas. Therefore, half of the burners of the regenerative alternating combustion burner installed in the heating furnace are burning, but the other half of the burners contribute to the preheating of the combustion air by storing the sensible heat of the flue gas in the heat storage body. It is not involved in the direct burning of things. This is because, when comparing the heat storage type burner of the heat storage type alternating combustion burner device with a normal burner not equipped with a heat storage body, the heat storage type burner of the alternating combustion type has the same combustion capacity as that of the heat storage type burner. This means that more than twice the number of burners and installation locations are required. That is, there is a drawback that causes an increase in equipment cost. Further, if there is a physical restriction on the place where the heating furnace is installed, it may be difficult to adopt the regenerative alternating combustion burner device in the heating furnace.

【０００６】また、交番燃焼方式に限らず蓄熱式バーナ
では、その蓄熱体の占める容積が大きいために蓄熱式バ
ーナを設置する広い場所を必要とする等の欠点がある。
また、バーナの燃焼容量は加熱炉の仕様に定められた加
熱条件の最大容量で設定される。通常の操業状態ではバ
ーナ燃焼容量に余裕のある状態で操業することが多い。
従って、蓄熱式交番燃焼バーナ装置では半数が燃焼状態
となり、燃焼中の蓄熱式バーナも最大６０％程度の能力
で操業されので、燃焼設備としては無駄が多いものとな
る欠点がある。Further, the heat storage type burner is not limited to the alternating combustion type, but has a drawback that a large space for installing the heat storage type burner is required because the volume occupied by the heat storage body is large.
Further, the combustion capacity of the burner is set by the maximum capacity of the heating conditions defined in the specifications of the heating furnace. Under normal operating conditions, the burner combustion capacity is often sufficient.
Therefore, half of the heat-storage type alternating combustion burner is in a combustion state, and the heat-storage type burner during combustion is operated with a maximum capacity of about 60%, which is a waste of combustion equipment.

【０００７】更に、蓄熱式交番燃焼バーナ装置は、燃焼
空気の流速が早いことが炉内温度の均一化に寄与する
が、定常燃焼状態では燃焼量を絞った状態で運転され
る。従って、加熱炉内に燃焼空気の理想的な流速が得ら
れず、炉内温度の均一化に支障を与える欠点がある。ま
た、交番燃焼方式の加熱炉では、燃焼切換時に炉圧変動
が生じる要因となる。即ち、炉圧変動によって加熱炉に
衝撃を与えるので、炉側壁の強度をその衝撃に耐え得る
強度としなければならなく、加熱炉の建設費用を上昇さ
せる欠点がある。Further, the regenerative type alternating combustion burner apparatus is operated in a state where the combustion amount is reduced in the steady combustion state, although the fact that the flow velocity of the combustion air is high contributes to the uniformization of the temperature in the furnace. Therefore, the ideal flow velocity of the combustion air cannot be obtained in the heating furnace, and there is a drawback that it hinders the uniformization of the temperature in the furnace. Further, in the heating furnace of the alternating combustion type, it becomes a factor that the furnace pressure fluctuates when switching the combustion. That is, since the heating furnace is impacted by fluctuations in the furnace pressure, the strength of the furnace side wall has to be high enough to withstand the impact, which has the drawback of increasing the construction cost of the heating furnace.

【０００８】本発明は、上述のような課題に鑑みなされ
たものであり、加熱炉内の温度分布を均一化し得る加熱
炉を提供するとともに、この加熱炉に用いられる蓄熱式
燃焼装置及びその燃焼方法を提供することを目的として
いる。また、本発明は、加熱炉の設置場所の制約を低減
し得る蓄熱式燃焼装置及びその蓄熱式燃焼装置を備える
加熱炉を提供することを目的としている。また、本発明
は、むだが少ない燃焼容量による燃焼装置によって加熱
することができる加熱炉とその蓄熱式燃焼装置及びその
燃焼方法を提供することを目的としている。また、本発
明は、炉圧変動が少ない蓄熱式燃焼装置を備える加熱炉
及びその蓄熱式燃焼装置及びその燃焼方法を提供するこ
とを目的としている。The present invention has been made in view of the above problems, and provides a heating furnace capable of making the temperature distribution in the heating furnace uniform, and a regenerative combustion device used in this heating furnace and its combustion. It is intended to provide a way. Another object of the present invention is to provide a regenerative combustion device that can reduce restrictions on the installation location of the heating furnace and a heating furnace that includes the regenerative combustion device. Another object of the present invention is to provide a heating furnace which can be heated by a combustion device having a small combustion capacity, a heat storage type combustion device thereof, and a combustion method thereof. Another object of the present invention is to provide a heating furnace provided with a heat storage type combustion device having little fluctuation in furnace pressure, a heat storage type combustion device thereof, and a combustion method thereof.

【０００９】[0009]

【課題を解決するための手段】上述の目的を達成するた
めになされたものであり、第１の発明は、加熱炉上部に
蓄熱体を備える空気ノズルを複数設け、前記加熱炉内の
温度を燃料着火温度以上に昇温した後に、炉内への燃料
供給量を増大させるとともに、前記空気ノズルの一方か
ら燃焼量に応じた燃焼空気の全量或いは不足分を炉内に
供給して燃焼させ、前記空気ノズルの他方から燃焼排ガ
スを炉外に排出するようにし、前記空気ノズルによる燃
焼空気の供給と燃焼排ガスの排出を所定の間隔で交互に
切り換えるようにしたことを特徴とする加熱炉であり、
炉内温度を燃料が自然に着火するに十分な温度（燃料着
火温度）以上に達した後に、燃料と燃焼空気を別々に炉
内に供給するようにし、燃焼排ガスが空気ノズルに設け
られた蓄熱体を通過する際に、燃焼排ガスの顕熱をその
蓄熱体に蓄え、切換え後、逆方向燃焼空気を流し燃焼空
気を高温予熱して炉内に供給するようにしたものであ
る。In order to achieve the above-mentioned object, the first invention is to provide a plurality of air nozzles provided with a heat storage body in the upper part of the heating furnace to control the temperature in the heating furnace. After the temperature is raised to the fuel ignition temperature or higher, the fuel supply amount into the furnace is increased, and the total amount or shortage of the combustion air corresponding to the combustion amount is supplied from one of the air nozzles into the furnace for combustion. A heating furnace characterized in that combustion exhaust gas is discharged from the other side of the air nozzle to the outside of the furnace, and supply of combustion air by the air nozzle and discharge of combustion exhaust gas are alternately switched at predetermined intervals. ,
After the temperature in the furnace reaches a temperature (fuel ignition temperature) higher than the temperature at which the fuel spontaneously ignites, the fuel and combustion air are separately supplied into the furnace, and the combustion exhaust gas is the heat storage provided in the air nozzle. When passing through the body, the sensible heat of the combustion exhaust gas is stored in the heat storage body, and after switching, the reverse direction combustion air is caused to flow to preheat the combustion air to a high temperature and then supplied into the furnace.

【００１０】また、第２の発明は、加熱炉本体の側壁に
加熱炉内の温度を昇温するバーナを備え、前記加熱炉上
部に蓄熱体を備える空気ノズルを備え、炉内温度を前記
バーナで燃料着火温度以上に昇温した後に、前記バーナ
から炉内に供給される燃料を増加させるとともに、前記
空気ノズルの半数から燃焼量に応じた燃焼空気を供給し
て燃焼させ、前記空気ノズルの他の半数から燃焼排ガス
を炉外に排出するようにし、前記空気ノズルを所定の間
隔で交互に切り換えて燃焼空気の供給と燃焼排ガスの排
出を行うようにしたことを特徴とする加熱炉であり、バ
ーナで加熱炉内の温度を燃料着火温度以上に昇温した後
に、バーナによる炉内への燃料供給量を増大させ、空気
ノズルから炉内に供給される燃焼空気量を燃焼量に応じ
て供給するようにし、燃焼排ガスが蓄熱体を通過する際
に、燃焼排ガスの顕熱をその蓄熱体に蓄えるようにし、
燃焼空気が蓄熱体を通過する際に、燃焼空気を高温予熱
して炉内に供給するようにしたものである。A second aspect of the present invention is provided with a burner for raising the temperature in the heating furnace on a side wall of the heating furnace main body, and an air nozzle having a heat storage body in the upper part of the heating furnace for controlling the temperature in the furnace by the burner. After increasing the temperature above the fuel ignition temperature with, increase the fuel supplied from the burner into the furnace, and supply combustion air from half of the air nozzles according to the amount of combustion to burn the air nozzles. The heating furnace is characterized in that the combustion exhaust gas is discharged from the other half to the outside of the furnace, and the air nozzles are alternately switched at a predetermined interval to supply the combustion air and discharge the combustion exhaust gas. After increasing the temperature in the heating furnace by the burner to the fuel ignition temperature or higher, increase the fuel supply amount into the furnace by the burner, and change the combustion air amount supplied from the air nozzle into the furnace according to the combustion amount. To supply , When the combustion exhaust gas passes through the regenerator, so store the sensible heat of the combustion exhaust gas to the regenerator,
When the combustion air passes through the heat storage body, the combustion air is preheated to a high temperature and supplied into the furnace.

【００１１】また、第３の発明は、加熱炉本体の側壁に
バーナと燃料投入用ノズルとを備え、且つ、前記加熱炉
上部に蓄熱体を備える空気ノズルを備え、前記バーナに
よって炉内温度を燃料着火温度以上に昇温した後に、前
記燃料投入用ノズルから炉内に燃料を供給するととも
に、前記空気ノズルの一方から供給される燃焼空気によ
って燃焼させ、前記空気ノズルの他方から燃焼排ガスを
炉外に排出するようにし、所定の間隔で前記空気ノズル
を交互に切り換えて燃焼空気の供給と燃焼排ガスの排出
を行うことを特徴とする加熱炉であり、燃料投入用ノズ
ルを設けて燃料を炉内に供給し、燃焼空気は加熱炉の上
部から空気ノズルから供給するようにし、燃焼排ガスを
他の空気ノズルから排出するものである。A third aspect of the invention is to provide a burner and a fuel injection nozzle on a side wall of the heating furnace main body, and an air nozzle equipped with a heat storage body on the upper part of the heating furnace. After the temperature is raised to the fuel ignition temperature or higher, the fuel is supplied from the fuel injection nozzle into the furnace and is burned by the combustion air supplied from one of the air nozzles, and the combustion exhaust gas is discharged from the other of the air nozzles. A heating furnace characterized in that the air is discharged to the outside, and the air nozzles are alternately switched at a predetermined interval to supply combustion air and discharge combustion exhaust gas. The combustion air is supplied to the inside of the heating furnace from the air nozzle, and the combustion exhaust gas is discharged from another air nozzle.

【００１２】また、第４の発明は、加熱炉の炉本体側壁
に設けられた炉内温度を燃料着火温度以上に昇温した
後、燃料のみを増大させるバーナと、前記加熱炉の上部
に設けられた蓄熱体を備える空気ノズルとを具備し、前
記空気ノズルによる燃焼空気の供給と燃焼排ガスの排出
を所定の間隔で交互に切り換えて行うようにしたことを
特徴とする加熱炉であり、バーナで加熱炉内の温度を燃
料着火温度以上に昇温した後に、前記バーナによる炉内
への燃料供給量を増大させ、空気ノズルから供給される
燃焼空気の量を燃焼量に応じて供給するようにし、燃焼
排ガスが蓄熱体を通過する際に、燃焼排ガスの顕熱をそ
の蓄熱体に蓄えるようにし、燃焼空気が蓄熱体を通過す
る際に、燃焼空気を高温予熱して炉内に供給するように
したものである。A fourth aspect of the present invention is a burner provided on the side wall of the furnace body of the heating furnace for increasing only the fuel after raising the temperature inside the furnace to a temperature above the fuel ignition temperature, and a burner provided above the heating furnace. A heating furnace, comprising: an air nozzle having a heat storage body, wherein the supply of combustion air and the discharge of combustion exhaust gas by the air nozzle are alternately switched at a predetermined interval. After increasing the temperature in the heating furnace to a temperature above the fuel ignition temperature by, increase the amount of fuel supplied to the furnace by the burner and supply the amount of combustion air supplied from the air nozzle according to the combustion amount. When the combustion exhaust gas passes through the heat storage body, the sensible heat of the combustion exhaust gas is stored in the heat storage body, and when the combustion air passes through the heat storage body, the combustion air is preheated to a high temperature and supplied into the furnace. It was done like this.

【００１３】また、第５の発明は、加熱炉の本体側壁に
備えられた炉内温度を燃料着火温度以上に昇温するバー
ナまたは蓄熱式交番燃焼バーナと、燃料着火温度以上の
温度に設定した炉内に燃料を噴射する加熱炉側壁に設け
られた燃料投入用ノズルと、前記加熱炉の上部に設けら
れた蓄熱体を備える空気ノズルとを具備し、前記空気ノ
ズルによる燃焼空気の供給と燃焼排ガスの排出を所定の
間隔で交互に切り換えるようにしたことを特徴とする加
熱炉であり、バーナまたは蓄熱式交番燃焼バーナによっ
て炉内温度を燃料着火温度以上に昇温した後、燃料投入
用ノズルから燃料を炉内に供給し、空気ノズルから燃焼
空気を供給し、燃焼排ガスを炉外に排出する際に、燃焼
排ガスの顕熱をその蓄熱体に蓄えるようにし、燃焼空気
が通過する際に、燃焼空気を予熱して炉内に供給するよ
うにしたものである。蓄熱式交番燃焼バーナは加熱炉の
最大設定温度よりも低い温度である燃料が自然着火する
温度に設定するためのものであり、蓄熱式交番燃焼バー
ナの蓄熱体は小型のものでよい。A fifth aspect of the invention is to set a burner or a regenerative alternating combustion burner provided on the side wall of the main body of the heating furnace for raising the temperature in the furnace to a temperature higher than the fuel ignition temperature, and a temperature higher than the fuel ignition temperature. A fuel injection nozzle provided on a side wall of a heating furnace for injecting fuel into the furnace, and an air nozzle provided with a heat storage body provided at an upper portion of the heating furnace, and supply and combustion of combustion air by the air nozzle. A heating furnace characterized in that exhaust gas discharge is alternately switched at predetermined intervals.The fuel injection nozzle is used after the temperature inside the furnace has been raised to a level higher than the fuel ignition temperature by a burner or a regenerative alternating combustion burner. To supply the fuel to the inside of the furnace, to supply the combustion air from the air nozzle, to discharge the combustion exhaust gas to the outside of the furnace, to store the sensible heat of the combustion exhaust gas in its heat storage body, and when the combustion air passes through. , To preheat the baked air is obtained so as to supply into the furnace. The regenerative alternating combustion burner is for setting the temperature lower than the maximum set temperature of the heating furnace to the temperature at which the fuel spontaneously ignites, and the regenerator of the regenerative alternating combustion burner may be small.

【００１４】また、第６の発明は、加熱炉の本体側壁に
備えられた炉内温度を燃料着火温度以上に加熱し、前記
炉内温度を燃料着火温度以上の温度に達した後に燃料の
供給量を増大させるバーナと、前記加熱炉上部に設けら
れた燃焼空気の供給と燃焼排ガスの排出を交互に行う蓄
熱体を備える空気ノズルと、前記炉内温度を計測して燃
料着火温度以上であるか否かを検出する検出手段と、
前記検出手段に基づいて前記バーナから供給させる燃料
供給量を増大させる燃焼制御手段と、前記空気ノズルに
よる炉内への燃焼空気の供給と炉外への燃焼排ガスの排
出を交互に切り換える切換制御手段と、を備えることを
特徴とする加熱炉に備えられた蓄熱式燃焼装置であり、
バーナによる燃焼によって炉内温度を燃料着火温度以上
に加熱し、その後、バーナからの燃料供給量を増大させ
て燃焼させるようにし、燃焼空気は空気ノズルから供給
するようにしたものである。Further, a sixth aspect of the invention is to supply the fuel after heating the temperature inside the furnace provided on the side wall of the main body of the heating furnace to a temperature above the fuel ignition temperature, and after the temperature inside the furnace reaches the temperature above the fuel ignition temperature. A burner for increasing the amount, an air nozzle provided at the upper part of the heating furnace, which is provided with a heat storage body for alternately supplying combustion air and discharging combustion exhaust gas, and measuring the in-furnace temperature to be at or above the fuel ignition temperature. Detecting means for detecting whether or not
Combustion control means for increasing the amount of fuel supplied from the burner based on the detection means, and switching control means for alternately switching between the supply of combustion air into the furnace by the air nozzle and the discharge of combustion exhaust gas outside the furnace. And a heat storage type combustion device provided in a heating furnace characterized by comprising:
Combustion by a burner heats the temperature in the furnace to a temperature above the fuel ignition temperature, then increases the amount of fuel supplied from the burner for combustion, and the combustion air is supplied from an air nozzle.

【００１５】また、第７の発明は、加熱炉の本体側壁に
備えられ、炉内温度を燃料着火温度以上の温度に昇温す
るためのバーナと、前記加熱炉内温度が燃料着火温度以
上の温度に達した後に燃料のみを供給する燃料投入用ノ
ズルと、前記加熱炉上部に備えられた前記加熱炉への燃
焼空気の供給と燃焼排ガスの排出を交互になし得る蓄熱
体を備える空気ノズルと、前記炉内温度が燃料着火温度
以上の温度であるか否かを検出する検出手段と、前記検
出手段に基づいて前記バーナから前記燃料投入用ノズル
に切り換えて燃焼させる燃焼制御手段と、前記空気ノズ
ルを介して炉内への燃焼空気の供給と炉外への燃焼排ガ
スの排出を所定の間隔で交互に切り換える切換制御手段
と、を備えること特徴とする加熱炉に備えられた蓄熱式
燃焼装置であり、炉内温度を燃料着火温度以上に昇温す
る際、バーナまたは蓄熱式交番燃焼バーナを用い、燃料
のみを炉内に供給する燃料投入用ノズルを備えており、
蓄熱体を備える空気ノズルによって燃焼空気の供給と燃
焼排ガスの排出を交互に繰り返すようにし、燃焼排ガス
は蓄熱体を通過する際にその顕熱を蓄積し、燃焼空気は
蓄熱体で高温予熱して炉内に供給するようにし、前記炉
内温度を検出して前記バーナから前記燃料投入用ノズル
への切り換えがなされている。A seventh aspect of the present invention is a burner provided on the side wall of the main body of the heating furnace for raising the temperature in the furnace to a temperature above the fuel ignition temperature, and the temperature in the heating furnace above the fuel ignition temperature. A fuel injection nozzle that supplies only fuel after reaching a temperature, and an air nozzle that includes a heat storage body that can alternately supply combustion air and discharge combustion exhaust gas to the heating furnace provided in the upper part of the heating furnace. A detection means for detecting whether or not the temperature in the furnace is a fuel ignition temperature or higher; a combustion control means for switching the burner to the fuel injection nozzle for combustion based on the detection means; A heat storage type combustion apparatus provided in a heating furnace, comprising: a switching control unit that alternately switches supply of combustion air into the furnace and discharge of combustion exhaust gas to the outside of the furnace via a nozzle at predetermined intervals. And When the internal temperature is raised to above the fuel ignition temperature, using a burner or regenerative alternate combustion burner provided with a fuel input nozzle for supplying only the furnace fuel,
The supply of combustion air and the discharge of combustion exhaust gas are alternately repeated by an air nozzle equipped with a heat storage body, the combustion exhaust gas accumulates its sensible heat when passing through the heat storage body, and the combustion air is preheated to a high temperature by the heat storage body. The burner is supplied to the inside of the furnace, the temperature inside the furnace is detected, and the burner is switched to the fuel injection nozzle.

【００１６】また、第８の発明は、加熱炉側壁に設けら
れたバーナによる燃焼によって炉内温度を燃料着火温度
以上の温度に昇温した後、前記バーナから炉内に供給さ
れる燃料を増大させるとともに、前記加熱炉上部に設け
られた蓄熱体を備える空気ノズルを介して燃焼量に応じ
た燃焼空気を供給し、他の蓄熱体を備える空気ノズルか
ら燃焼排ガスを排出するようにし、前記空気ノズルを介
してなされる燃焼空気の炉内への供給と燃焼排ガスの炉
外への排出を所定の間隔で交互に切り換えるようにし
て、炉内温度を制御するようにした特徴とする加熱炉の
燃焼方法であり、蓄熱体を備える空気ノズルを加熱炉の
上部に設け、炉内温度がバーナによって所定の温度に達
すると燃料供給量を増大させ、燃焼空気を空気ノズルが
供給して燃焼させるようにしたものであり、蓄熱式交番
燃焼バーナが加熱炉の側面に設ける必要ない加熱炉であ
る。The eighth aspect of the invention is to increase the amount of fuel supplied from the burner to the inside of the furnace after the temperature inside the furnace is raised to a temperature above the fuel ignition temperature by combustion by a burner provided on the side wall of the heating furnace. While supplying the combustion air according to the amount of combustion through an air nozzle provided with a heat storage body provided in the upper part of the heating furnace, exhaust the combustion exhaust gas from an air nozzle provided with another heat storage body, the air A heating furnace characterized by controlling the temperature inside the furnace by alternately switching the supply of combustion air into the furnace through a nozzle and the discharge of combustion exhaust gas outside the furnace at predetermined intervals. It is a combustion method, an air nozzle equipped with a heat storage body is provided in the upper part of the heating furnace, and when the temperature inside the furnace reaches a predetermined temperature by a burner, the fuel supply amount is increased, and the combustion air is supplied by the air nozzle and burned. Are those were Unishi, regenerative alternate combustion burner is heated furnace needs not be provided on the side surface of the heating furnace.

【００１７】また、第９の発明は、加熱炉側壁に設けら
れたバーナによる燃焼によって炉内温度を燃料着火温度
以上の温度に昇温した後、加熱炉側壁に設けられた燃焼
投入用ノズルから炉内に燃料を供給し、前記加熱炉上部
に設けられた蓄熱体を備える空気ノズルを介して燃焼量
に応じた燃焼空気を供給するとともに、燃焼排ガスを他
の蓄熱体を備える空気ノズルから排出し、前記燃焼空気
の炉内への供給と燃焼排ガスの炉外への排出を所定の間
隔で交互に切り換えるようにして、炉内温度を制御する
ことを特徴とする加熱炉の燃焼方法であり、蓄熱体を備
えるバーナを加熱炉の上部に設けたものであり、バーナ
として蓄熱体を備える蓄熱式交番燃焼バーナが用いられ
たとしてもこのバーナによる設定温度は低いので、蓄熱
式交番燃焼バーナ蓄熱体は小型ものもでよい。炉内温度
が所定の温度に達すると燃料投入用ノズルから燃料を供
給し、燃焼空気を空気ノズルから燃焼空気を供給して燃
焼させるようにしたものである。燃焼空気と燃焼排ガス
は蓄熱体を備える空気ノズルを通してなされている。The ninth aspect of the invention is to increase the temperature inside the furnace to a temperature above the fuel ignition temperature by combustion by a burner provided on the side wall of the heating furnace, and then from a combustion injection nozzle provided on the side wall of the heating furnace. Fuel is supplied into the furnace, and combustion air corresponding to the amount of combustion is supplied through an air nozzle equipped with a heat storage body provided in the upper part of the heating furnace, and combustion exhaust gas is discharged from an air nozzle equipped with another heat storage body. The combustion method of the heating furnace is characterized by controlling the temperature inside the furnace by alternately switching the supply of the combustion air into the furnace and the discharge of the combustion exhaust gas outside the furnace at a predetermined interval. , A burner equipped with a heat storage body is provided in the upper part of the heating furnace, and even if a heat storage type alternating combustion burner equipped with a heat storage body is used as the burner, the set temperature by this burner is low, so the heat storage type alternating combustion burner is Netsutai may a be a small thing. When the temperature in the furnace reaches a predetermined temperature, fuel is supplied from the fuel injection nozzle and combustion air is supplied from the air nozzle to burn the air. Combustion air and combustion exhaust gas are made through an air nozzle having a heat storage body.

【００１８】[0018]

【本発明の実施の形態】以下、本発明の実施の形態にお
ける個々の実施例について図面に基づき説明する。本発
明は、実施の形態の一つは加熱炉であり、また、他の実
施の形態は加熱炉に備える蓄熱式燃焼装置及び蓄熱式燃
焼装置による燃焼方法がある。BEST MODE FOR CARRYING OUT THE INVENTION Each embodiment of the present invention will be described below with reference to the drawings. One of the embodiments of the present invention is a heating furnace, and the other embodiment is a heat storage type combustion apparatus provided in the heating furnace and a combustion method using the heat storage type combustion apparatus.

【００１９】（加熱炉）図１は本発明に係る加熱炉の一
実施例を示し、図１（ａ）は断面図であり、図１（ｂ）
は同図（ａ）のＸ−Ｘ線に沿った断面図である。図１の
加熱炉は一例として連続式加熱炉を示しており、この加
熱炉は鋼材Ｃの加熱仕上温度を１０℃単位で制御して、
圧延鋼材の表面品質の向上を図ったり、歩留りを向上さ
せる目的で、炉側壁からバーナで加熱し、区画された燃
焼帯域毎に燃焼排ガスを炉外に排出するようにしたもの
である。(Heating Furnace) FIG. 1 shows an embodiment of the heating furnace according to the present invention. FIG. 1 (a) is a sectional view and FIG. 1 (b).
FIG. 4B is a sectional view taken along line XX of FIG. The heating furnace of FIG. 1 shows a continuous heating furnace as an example, and this heating furnace controls the heating finishing temperature of the steel material C in units of 10 ° C.,
For the purpose of improving the surface quality of the rolled steel material and improving the yield, it is heated by a burner from the side wall of the furnace and the combustion exhaust gas is discharged to the outside of the furnace in each divided combustion zone.

【００２０】同図に於いて、加熱炉１は、加熱炉本体２
の両側壁に燃料投入用ノズル３と蓄熱式交番燃焼バーナ
４が設けられ、加熱炉１の上部（天井部を含む）２ａと
下部（底部，段差部を含む）２ｂには、燃焼空気吸入用
或いは燃焼排ガス排出用として用いられる空気ノズル５
が複数備えられている。空気ノズル５内にはセラミック
ボードやハニカム構造体等で構成される蓄熱体６が設け
られ、燃焼空気の炉内への供給と燃焼排ガスの炉外への
排出を行うものである。空気ノズル５による燃焼空気の
供給と燃焼排ガスの排出は所定の周期（例えば、３０秒
間隔）で切り換わる。その際、燃焼排ガスＢの顕熱が蓄
熱体６に蓄えられ、次の周期で燃焼空気Ａがその空気ノ
ズルを通過する際に、蓄熱体６に蓄えられた熱によって
燃焼空気Ａを予熱して炉内に供給するようになされた加
熱炉である。In the figure, the heating furnace 1 is a heating furnace body 2
A fuel injection nozzle 3 and a regenerative alternating combustion burner 4 are provided on both side walls of the heating furnace 1, and combustion air suction is provided in an upper portion (including a ceiling portion) 2a and a lower portion (including a bottom portion and a step portion) 2b of the heating furnace 1. Alternatively, an air nozzle 5 used for exhausting combustion exhaust gas
There are multiple. A heat storage body 6 composed of a ceramic board, a honeycomb structure, or the like is provided in the air nozzle 5, and supplies combustion air into the furnace and discharges combustion exhaust gas to the outside of the furnace. The supply of combustion air by the air nozzle 5 and the discharge of combustion exhaust gas are switched at a predetermined cycle (for example, every 30 seconds). At that time, the sensible heat of the combustion exhaust gas B is stored in the heat storage body 6, and when the combustion air A passes through the air nozzle in the next cycle, the combustion air A is preheated by the heat stored in the heat storage body 6. It is a heating furnace designed to be fed into the furnace.

【００２１】燃料投入用ノズル３と蓄熱式交番燃焼バー
ナ４は、図１（ｂ）に示すように、加熱熱炉本体２の両
側壁に交互に配置され、燃料投入用ノズル３と蓄熱式交
番燃焼バーナ４が互いに向かい合うように配置されてい
る。燃焼帯域毎に燃料投入用ノズル３と蓄熱式交番燃焼
バーナ４が両側壁の上下合わせて４箇所設けられてい
る。また、加熱炉１の上部２ａには、図１（ａ）に示す
ように、燃焼空気供給用と燃焼排ガス排出用とを一対と
する空気ノズル５が炉幅方向に二対設けられ、加熱炉１
の下部２ｂにも同様に二対設けられ、合計８個の空気ノ
ズル５が設けられている。なお、加熱炉１の炉幅によっ
ては空気ノズル５が三対設けられる場合もあり、図１
（ａ）の実施例に限定するものではない。As shown in FIG. 1B, the fuel injection nozzles 3 and the heat storage type alternating combustion burners 4 are alternately arranged on both side walls of the heating furnace body 2, and the fuel injection nozzles 3 and the heat storage type alternating burners 4 are alternately arranged. The combustion burners 4 are arranged so as to face each other. A fuel injection nozzle 3 and a heat storage type alternating combustion burner 4 are provided at four locations on both side walls in the vertical direction for each combustion zone. Further, as shown in FIG. 1A, two pairs of air nozzles 5 for supplying combustion air and for discharging combustion exhaust gas are provided in the upper portion 2a of the heating furnace 1 in the furnace width direction. 1
Similarly, two pairs are also provided in the lower portion 2b of the above, and a total of eight air nozzles 5 are provided. Depending on the width of the heating furnace 1, three pairs of air nozzles 5 may be provided.
It is not limited to the example of (a).

【００２２】蓄熱式交番燃焼バーナ４は燃料が自然着火
する温度に達するまで炉内温度を上昇させるために用い
られる。炉内温度が燃料着火温度以上に設定されと燃料
投入用ノズル３から燃料を炉内に噴射して供給し燃料に
着火させ、且つ空気ノズル５から燃焼量に必要な燃焼空
気Ａを炉内に供給して燃焼させる。その燃焼排ガスＢを
他方の空気ノズル５から炉外に排出する。無論、燃焼帯
域毎に４箇所設けられた蓄熱式交番燃焼バーナ４は燃焼
と燃焼排ガスの排出を交互に、例えば３０秒間隔で切り
換えて行う。また、蓄熱式交番燃焼バーナ以外の普通の
バーナを用いてもよい。この蓄熱式交番燃焼バーナ４は
加熱炉１の最大加熱温度より低い温度に設定する燃焼容
量の小さいバーナでよく、従って、その蓄熱体の容積も
小型になる。The regenerative alternating combustion burner 4 is used to raise the temperature in the furnace until the fuel reaches the temperature at which it spontaneously ignites. When the temperature in the furnace is set to be higher than the fuel ignition temperature, the fuel is injected and supplied from the fuel injection nozzle 3 into the furnace to ignite the fuel, and the combustion air A required for the combustion amount is supplied from the air nozzle 5 into the furnace. Supply and burn. The combustion exhaust gas B is discharged from the other air nozzle 5 to the outside of the furnace. Of course, the regenerative alternating combustion burners 4 provided at four locations for each combustion zone alternately perform combustion and exhaust of combustion exhaust gas, for example, at intervals of 30 seconds. Further, an ordinary burner other than the heat storage type alternating combustion burner may be used. The regenerative alternating combustion burner 4 may be a burner with a small combustion capacity set to a temperature lower than the maximum heating temperature of the heating furnace 1, and therefore the volume of the regenerator is also small.

【００２３】次に、本発明に係る加熱炉の他の実施例に
ついて、図２の断面図を参照して示す。図２に於いて、
図１と同一部分には同一符号が付与されている。加熱炉
本体２の側壁には従来式バーナ１５が備えられ、バーナ
１５には燃料と燃焼空気が炉内にそれぞれ供給されるノ
ズルが設けられている。それらのノズルには燃料供給を
制御する制御弁１５ａと燃焼空気を制御する制御弁１５
ｂがそれぞれ備えられている。加熱炉１の上部２ａと下
部２ｂには、図１の加熱炉と同様に蓄熱体６を備える空
気ノズル５が設けられている。また、燃焼空気供給系と
燃焼排ガス排出系は図１と同一であり、図２を参照して
説明する。また、以下に説明するように燃料供給系統は
図１と異なる。Next, another embodiment of the heating furnace according to the present invention will be described with reference to the sectional view of FIG. In FIG.
The same parts as those in FIG. 1 are designated by the same reference numerals. The side wall of the heating furnace main body 2 is provided with a conventional burner 15, and the burner 15 is provided with nozzles for supplying fuel and combustion air into the furnace, respectively. These nozzles have a control valve 15a for controlling fuel supply and a control valve 15 for controlling combustion air.
b are provided respectively. At the upper part 2a and the lower part 2b of the heating furnace 1, air nozzles 5 having a heat storage body 6 are provided as in the heating furnace of FIG. The combustion air supply system and the combustion exhaust gas discharge system are the same as those in FIG. 1, and will be described with reference to FIG. Further, as will be described below, the fuel supply system is different from that shown in FIG.

【００２４】なお、図１，図２の加熱炉は、例えば、均
熱炉であっても適応できることは明らかであり、炉内温
度を燃料着火温度以上に昇温した後に、燃料のみを炉内
に噴射させるバーナのノズルや燃料投入用ノズルによっ
て炉内に噴射させ、且つ炉の天井部（上部）や底部（下
部）に設けられた蓄熱体を備える空気ノズルから燃焼空
気を供給して燃焼させることができることは明らかであ
る。また、図１，図２に於いて、燃料投入ノズルを設け
ない場合は、炉内温度が着火温度以上で、従来式バーナ
の空気供給を削減或いは停止し燃料のみを炉内に供給す
るものである。It is obvious that the heating furnace shown in FIGS. 1 and 2 can be applied to, for example, a soaking furnace, and only the fuel is heated in the furnace after the temperature in the furnace is raised to the fuel ignition temperature or higher. It is injected into the furnace by a burner nozzle or a fuel injection nozzle, and combustion air is supplied and burned from an air nozzle equipped with a heat storage body provided in the ceiling (upper part) or bottom (lower part) of the furnace. It is clear that you can. Further, in FIG. 1 and FIG. 2, when the fuel injection nozzle is not provided, the temperature inside the furnace is higher than the ignition temperature, and the air supply of the conventional burner is reduced or stopped to supply only the fuel into the furnace. is there.

【００２５】また、他の用途の加熱炉では上部（天井
部）のみに蓄熱体を備える空気ノズルが設けられる場合
があり、蓄熱体が加熱炉の側壁方向に突出しない燃焼装
置である。無論、燃焼排ガスは蓄熱体を備える空気ノズ
ルから炉外に排出する際に、燃焼排ガスの顕熱を蓄熱体
に蓄積して、次の周期で燃焼空気をこの空気ノズルの蓄
熱体に蓄積した熱で高温予熱して炉内に供給することに
より、熱回収率の改善に寄与するとともに、空気ノズル
の配置及び空気ノズルによる燃焼空気の供給と燃焼排ガ
スの排出を交互に切り換えて行うことにより炉内温度の
均一化に寄与するものである。In a heating furnace for other uses, an air nozzle having a heat storage body may be provided only in the upper part (ceiling part), and the heat storage body does not project in the side wall direction of the heating furnace. Of course, when the combustion exhaust gas is discharged from the air nozzle equipped with the heat storage body to the outside of the furnace, the sensible heat of the combustion exhaust gas is stored in the heat storage body, and the combustion air is accumulated in the heat storage body of this air nozzle in the next cycle. It contributes to the improvement of the heat recovery rate by preheating at high temperature and supplying it into the furnace, and by alternately arranging the air nozzles and switching the supply of combustion air by the air nozzles and the discharge of combustion exhaust gas. This contributes to uniform temperature.

【００２６】（加熱炉の蓄熱式燃焼装置及びその燃焼方
法）次に、本発明に係る加熱炉の蓄熱式燃焼装置及びそ
の燃焼方法の一実施例について、図３乃至図８を参照し
て説明する。図３は加熱炉に設けられた蓄熱式燃焼装置
及びその燃焼制御系統の一実施例を示し、図１の加熱炉
と同一であり、同一部分には同一符号が付与されてい
る。同図に於いて、加熱炉１の両側壁に向かい合うよう
に燃料投入用ノズル３と蓄熱式交番燃焼バーナ４が両側
壁の上方と下方に配置されている。炉内に供給される燃
焼空気Ａの供給経路は、制御弁８1 〜８4 ，切換制御弁
９1 〜９4 及び空気ノズル（５ａ，５ｃ，５ｆ，５ｈ）
または空気ノズル（５ｂ，５ｄ，５ｅ，５ｇ）の経路か
らなる。燃焼排ガスの排出経路は、空気ノズル（５ａ，
５ｃ，５ｆ，５ｈ）または空気ノズル（５ｂ，５ｄ，５
ｅ，５ｇ），切換制御弁９1 〜９4 ，送風機１１及びダ
クト１２の経路からなる。また、燃料供給系は、制御弁
３ａを介して燃料投入用ノズル３から炉内に供給する経
路と、制御弁４ａを介して燃料と燃焼空気が蓄熱式交番
燃焼バーナ４から炉内に供給する経路からなる。(Heat Storage Regenerative Combustion Device and Combustion Method Thereof) Next, one embodiment of the reheating combustion device for a heating furnace and the combustion method thereof according to the present invention will be described with reference to FIGS. 3 to 8. To do. FIG. 3 shows an embodiment of a heat storage type combustion device provided in a heating furnace and its combustion control system, which is the same as the heating furnace of FIG. 1 and the same parts are designated by the same reference numerals. In the figure, a fuel injection nozzle 3 and a regenerative alternating combustion burner 4 are arranged above and below both side walls so as to face both side walls of the heating furnace 1. The supply path of the combustion air A supplied into the furnace includes control valves 8 1 to 8 4 , switching control valves 9 1 to 9 4 and air nozzles (5a, 5c, 5f, 5h).
Alternatively, it is constituted by a path of air nozzles (5b, 5d, 5e, 5g). The exhaust gas exhaust path is provided with an air nozzle (5a,
5c, 5f, 5h) or air nozzles (5b, 5d, 5)
e, 5g), the switching control valves 9 1 to 9 4 , the blower 11 and the duct 12. In addition, the fuel supply system supplies fuel and combustion air into the furnace from the regenerative alternating combustion burner 4 via the control valve 3a and the fuel injection nozzle 3 into the furnace, and via the control valve 4a. It consists of a route.

【００２７】制御部１３は炉内に設けられた温度センサ
１０からの出力が入力され、制御部１３で演算処理して
炉内温度が所定の値であるか否かを判断して、制御弁８
1 〜８4 ，切換制御弁９1 〜９4 ，制御弁３ａ，４ａを
操作して炉内温度を制御している。制御部１３には燃焼
制御プログラムが読み込まれた記憶装置が設けられてお
り、温度センサ１０によって加熱炉内温度を計測して炉
内温度が燃料着火温度以上であるか否かを検出する検出
手段と、この検出手段によって炉内温度が所定の値（燃
料着火温度）に達したか否かを判断して、通常方式のバ
ーナや蓄熱式交番燃焼バーナ４から燃料投入用バーナ３
に切り換える燃焼制御手段と、切換制御弁９1 〜９4 の
ダンパ９ａを切り換えることにより、空気ノズル５の燃
焼空気の供給と燃焼排ガスの排出を所定の周期（例え
ば、３０秒間隔）で交互に切り換える切換制御手段とを
備えている。An output from the temperature sensor 10 provided in the furnace is input to the control unit 13, and the control unit 13 performs arithmetic processing to determine whether or not the temperature in the furnace is a predetermined value, and the control valve 8
1-8 4, switching control valve 9 to 93 4, the control valve 3a, and controls the furnace temperature by operating the 4a. The control unit 13 is provided with a storage device in which the combustion control program is read, and a detection unit that measures the temperature inside the heating furnace by the temperature sensor 10 and detects whether the temperature inside the furnace is equal to or higher than the fuel ignition temperature. Then, it is judged by this detecting means whether or not the temperature in the furnace has reached a predetermined value (fuel ignition temperature), and the burner 3 for the normal system or the regenerative alternating combustion burner 4 to the fuel injection burner 3 is used.
A combustion control means for switching the, by switching the damper 9a of the switching control valve 91 to 93 4, alternately discharge and supply the combustion exhaust gas of the combustion air in the air nozzle 5 at a predetermined period (e.g., 30 seconds) And switching control means for switching.

【００２８】一方、燃焼空気Ａが空気ノズル５ｂ，５
ｄ，５ｅ，５ｇを通過する際に、燃焼空気Ａの顕熱は蓄
熱体６ｂ，６ｄ，６ｅ，６ｇに蓄積される。切換制御弁
９1 〜９4 のダンパ９ａを制御部１３からの制御信号に
基づいて約３０秒間隔で切り換えがなされ、ダンパ９ａ
は点線の位置に切り換わる。即ち、燃焼空気Ａの顕熱に
よって蓄熱体６ｂ，６ｄ，６ｅ，６ｇに蓄積された熱
は、切換制御弁９1 〜９4が切り換えられると燃焼空気
Ａが空気ノズル５ｂ，５ｄ，５ｅ，５ｇを通過する際
に、蓄熱体６ｂ，６ｄ，６ｅ，６ｇによる熱によって燃
焼空気Ａを高温予熱して炉内に供給される。On the other hand, the combustion air A is supplied to the air nozzles 5b, 5
When passing through d, 5e and 5g, the sensible heat of the combustion air A is accumulated in the heat storage bodies 6b, 6d, 6e and 6g. The dampers 9a of the switching control valves 9 1 to 9 4 are switched at intervals of about 30 seconds based on a control signal from the control unit 13, and the dampers 9a
Switches to the dotted position. That is, the regenerator 6b by sensible heat of the combustion air A, 6d, 6e, the heat accumulated in the 6 g, the switching control valve 9 to 93 4 is switched combustion air A air nozzles 5b, 5d, 5e, 5 g When passing through, the combustion air A is preheated to a high temperature by the heat of the heat storage bodies 6b, 6d, 6e, 6g and supplied into the furnace.

【００２９】先ず、燃料と空気が制御弁４ａを介して蓄
熱式交番燃焼バーナ４を介して炉内に供給されて燃焼
し、炉内温度は上昇する。炉内温度が燃料着火温度に達
するまで燃焼が継続され、制御部１３によって炉内温度
が燃料着火温度に達したことを検出すると、制御部１３
からの制御信号によって制御弁４ａを閉じるとともに、
制御弁３ａを開いて燃料投入用ノズル３から燃料を炉内
に噴射される。燃料投入用ノズル３から炉内に供給され
る燃料と空気ノズル５から供給される燃焼空気によっ
て、炉内温度が設定温度まで燃焼が継続される。制御部
１３で炉内温度が設定温度に達したことを検出すると、
制御弁４ａを絞り、燃料供給量を減少させて、炉内温度
が一定に制御される。First, fuel and air are supplied into the furnace through the regenerative alternating combustion burner 4 via the control valve 4a and burned, so that the temperature inside the furnace rises. The combustion is continued until the temperature in the furnace reaches the fuel ignition temperature, and when the controller 13 detects that the temperature in the furnace reaches the fuel ignition temperature, the controller 13
While closing the control valve 4a by the control signal from
The control valve 3a is opened and fuel is injected from the fuel injection nozzle 3 into the furnace. With the fuel supplied from the fuel injection nozzle 3 into the furnace and the combustion air supplied from the air nozzle 5, the combustion is continued to the preset temperature. When the control unit 13 detects that the temperature inside the furnace has reached the set temperature,
The control valve 4a is throttled to reduce the fuel supply amount and the furnace temperature is controlled to be constant.

【００３０】一方、燃焼空気Ａは制御弁８1 〜８4 を介
して切換制御弁９1 〜９4 に供給され、切換制御弁９1
〜９4 で選択した空気ノズル５ａ，５ｃ，５ｆ，５ｈか
ら炉内に供給される。炉内の燃料排ガスＢは空気ノズル
５ｂ，５ｄ，５ｅ，５ｇを介して切換制御弁９1 〜９4
から送風機１１に引き込まれてダクト１２を介して炉外
に排出される。燃焼空気Ａは空気ノズル５ｂ，５ｄ，５
ｅ，５ｇを通過する際に、燃焼空気Ａの顕熱が蓄熱体６
ｂ，６ｄ，６ｅ，６ｇに蓄積される。切換制御弁９1 〜
９4 のそれぞれダンパ９ａが点線の位置に切り換えがな
されると、蓄熱された蓄熱体６ｂ，６ｄ，６ｅ，６ｇに
燃焼空気Ａが通過して燃焼空気Ａを高温予熱して炉内に
供給される。On the other hand, the combustion air A is supplied to the switching control valves 9 1 to 9 4 via the control valves 8 1 to 8 4 , and the switching control valve 9 1
-9 4 air nozzles 5a selected by, 5c, 5f, supplied from 5h into the furnace. The fuel exhaust gas B in the furnace is passed through the air nozzles 5b, 5d, 5e and 5g to switch control valves 9 1 to 9 4
Is drawn into the blower 11 and discharged from the furnace through the duct 12. Combustion air A is air nozzles 5b, 5d, 5
When passing e, 5g, the sensible heat of the combustion air A is transferred to the heat storage body 6
It is accumulated in b, 6d, 6e and 6g. Switching control valve 9 1 ~
When each of the dampers 9a of 9 4 is switched to the position indicated by the dotted line, the combustion air A passes through the stored heat storage bodies 6b, 6d, 6e, 6g to preheat the combustion air A to a high temperature and supply it to the furnace. It

【００３１】次に、図４乃至図８を参照して加熱炉の蓄
熱式燃焼装置及びその燃焼方法について説明する。図４
（ａ），（ｂ）は図１に示した加熱炉の燃焼状態を示
し、Ｆ１，Ｆ２が炎、Ｂが燃焼排ガスの排出方向を示し
ている。図４（ａ）は炉内温度を燃料が自然着火する温
度以上（燃料着火温度）に昇温する燃焼状態を示し、図
４（ｂ）が炉内温度が燃料着火温度以上に達すると、燃
料投入用ノズル３1 〜３6 から燃料を炉内に噴射させる
燃焼状態を示している。Next, a heat storage type combustion apparatus for a heating furnace and a combustion method thereof will be described with reference to FIGS. FIG.
(A), (b) shows the combustion state of the heating furnace shown in FIG. 1, F1, F2 are flames, B has shown the discharge direction of combustion exhaust gas. FIG. 4 (a) shows a combustion state in which the temperature in the furnace rises above the temperature at which the fuel spontaneously ignites (fuel ignition temperature), and FIG. 4 (b) shows that when the temperature in the furnace reaches the temperature above the fuel ignition temperature, the fuel shows a combustion state for injecting fuel into the furnace from the feeding nozzle 3 1 to 3 6.

【００３２】また、図５は加熱炉の炉内温度Ｔの状態と
燃料供給制御Ｐの制御状態を示している。同図に於い
て、第１燃焼領域（ｔ0 〜ｔ1 ），第２燃焼領域（ｔ1
〜ｔ2）及び第３燃焼領域（ｔ2 〜ｔ3 ) からなり、第
１燃焼領域は図４（ａ）による燃焼状態であり、第２燃
焼領域（ｔ1 〜ｔ2 ）は図４（ｂ）に示した燃焼状態で
あり、定常運転状態を示している。第１燃焼領域は、炉
内温度が燃料を着火するに十分な温度に達するまで炉内
温度を昇温する燃焼領域であり、この燃料着火温度以上
に達すると、燃料投入用ノズルから燃料が供給される第
２燃焼領域に進む。また、図２に示した加熱炉では、第
２燃焼領域ではバーナ１５から燃料の供給量を増大させ
て燃焼させる。燃焼を停止する場合は、燃料投入用ノズ
ル３とバーナ１５の燃焼供給量を減衰して燃焼停止させ
る。FIG. 5 shows the state of the furnace temperature T of the heating furnace and the control state of the fuel supply control P. In the figure, the first combustion region (t 0 to t 1 ) and the second combustion region (t 1
˜t 2 ) and a third combustion zone (t 2 ˜t 3 ), the first combustion zone is the combustion state according to FIG. 4 (a), and the second combustion zone (t 1 ˜t 2 ) is shown in FIG. It is the combustion state shown in b) and shows the steady operation state. The first combustion region is a combustion region in which the temperature inside the furnace is raised until the temperature inside the furnace reaches a temperature sufficient to ignite the fuel. When the temperature reaches or exceeds this fuel ignition temperature, fuel is supplied from the fuel injection nozzle. And proceed to the second combustion zone. Further, in the heating furnace shown in FIG. 2, the amount of fuel supplied from the burner 15 is increased in the second combustion region for combustion. When stopping the combustion, the combustion supply amount of the fuel injection nozzle 3 and the burner 15 is attenuated to stop the combustion.

【００３３】以下、図６〜図８のフローチャートに基づ
いて燃焼方法について説明する。図６は蓄熱式交番燃焼
バーナと燃料投入用バーナによる燃焼方法（図１の実
施）、図７はバーナと燃料投入用バーナによる燃焼方法
（図１の変形実施例）、図８はバーナのみによる燃焼方
法を示している（図２の実施例）。The combustion method will be described below with reference to the flow charts of FIGS. 6 is a combustion method using a regenerative alternating combustion burner and a fuel charging burner (implementation of FIG. 1), FIG. 7 is a combustion method using a burner and a fuel charging burner (variant embodiment of FIG. 1), and FIG. 8 is only a burner. The combustion method is shown (the example of FIG. 2).

【００３４】図６の燃焼制御方式は、図１，図２に示す
加熱炉の燃焼制御方法であり、蓄熱式交番燃焼バーナ４
と燃料投入用ノズル３を備える加熱炉である。ステップ
Ｓ１〜Ｓ３は加熱炉１の炉内温度を燃料着火温度に達す
るまで燃料を供給して昇温するステップである。蓄熱式
交番燃焼バーナ４に点火して、蓄熱式交番燃焼バーナ４
の燃焼量を増大させて、燃料着火温度に達するまで燃料
供給量を段階的に増大させる。炉内温度が燃料着火温度
以上に達すると、ステップＳ４に進む。このステップで
は、温度センサ１０によって炉内温度を検出してその出
力を制御部１３に入力し、制御部１３の検出手段によっ
て炉内温度が燃料着火温度以上であるか否かを検出し
て、炉内温度が燃料着火温度以上であることを検出する
と、ステップＳ４では蓄熱式交番燃焼バーナ４による燃
焼から燃料投入用バーナ３に切り換え、燃料投入用バー
ナから燃料が供給されるとともに、加熱炉１の上部２
ａ，下部２ｂに設けられた空気ノズル５から燃焼量に応
じた燃焼空気が供給される。ステップＳ５に進み、燃料
が供給され、空気ノズルから燃焼排ガスの排出と燃焼空
気の供給が交互に切り換えながら燃焼を継続する。ステ
ップＳ６に進み、加熱炉内温度が設定温度に達したか否
かを判断し、設定温度に達すると、ステップＳ７に進
み、炉内温度を設定温度に維持するように燃焼を継続す
る。加熱炉１の燃焼を停止するか否かは、ステップＳ８
で判断し、燃焼を終了する場合は、ステップＳ９に進
み、燃料投入用バーナ３の燃料供給量を徐々に削減して
燃焼を停止する。The combustion control method of FIG. 6 is the combustion control method of the heating furnace shown in FIGS. 1 and 2, and the heat storage type alternating combustion burner 4 is used.
And a heating furnace equipped with a fuel injection nozzle 3. Steps S1 to S3 are steps in which the temperature inside the heating furnace 1 is increased by supplying fuel until the temperature reaches the fuel ignition temperature. The regenerative alternating combustion burner 4 is ignited to generate the regenerative alternating combustion burner 4
The fuel supply amount is increased stepwise until the fuel ignition temperature is reached. When the temperature in the furnace reaches or exceeds the fuel ignition temperature, the process proceeds to step S4. In this step, the temperature sensor 10 detects the temperature in the furnace and inputs the output to the control unit 13, and the detection means of the control unit 13 detects whether the temperature in the furnace is the fuel ignition temperature or higher, When it is detected that the temperature inside the furnace is equal to or higher than the fuel ignition temperature, in step S4, the combustion by the regenerative alternating combustion burner 4 is switched to the fuel input burner 3, fuel is supplied from the fuel input burner, and the heating furnace 1 Upper part 2
Combustion air according to the amount of combustion is supplied from the air nozzles 5 provided on the a and lower portions 2b. In step S5, the fuel is supplied, and combustion is continued while alternately switching the discharge of combustion exhaust gas and the supply of combustion air from the air nozzle. In step S6, it is determined whether or not the temperature in the heating furnace has reached the set temperature. When the temperature has reached the set temperature, the process proceeds to step S7, in which combustion is continued to maintain the temperature in the furnace at the set temperature. Whether to stop the combustion of the heating furnace 1 is determined in step S8.
If the combustion is to be ended, the process proceeds to step S9 to gradually reduce the fuel supply amount of the fuel charging burner 3 and stop the combustion.

【００３５】図７の加熱炉の燃焼方法について、図１，
図２の変形実施例であり、蓄熱式交番燃焼バーナ４に代
えて通常方式のバーナを用いた加熱炉である（図３を参
照して説明する）。同図に於いて、ステップＳ１０〜Ｓ
１２は加熱炉１の炉内温度を燃料着火温度に達するまで
燃料を供給して昇温するステップである。通常方式の燃
焼空気と燃料を混合して炉内に供給して燃焼させるバー
ナであり、バーナに点火し、バーナに燃焼空気と燃料を
供給して燃焼させて加熱炉１の炉内温度を昇温し、燃料
着火温度に達するまで燃料供給量を段階的に増大させ
る。炉内温度が燃料着火温度以上に達すると、ステップ
Ｓ１３に進む。炉内温度の検出は、温度センサ１０から
の出力を制御部１３に入力し、制御部１３によって炉内
温度が燃料着火温度以上であるか否かを判断し、炉内温
度が燃料着火温度以上であることを検出すると、ステッ
プＳ１３では通常方式のバーナによる燃焼から燃料投入
用バーナ３に切り換える。ステップＳ１４に進み、燃料
投入用バーナ３から燃料が供給され、加熱炉１の上部２
ａ，下部２ｂに設けられた空気ノズル５から燃焼量に応
じた燃焼空気が供給される。また、他方の空気ノズル５
から燃焼排ガスが排出される。空気ノズル５による燃焼
空気Ａの供給と燃焼排ガスＢの排出が交互に切り換えな
がら燃焼を継続する。ステップＳ１５に進み、炉内温度
が設定温度以上（燃料着火温度以上）に達したか否かを
制御部１３で判断し、設定温度以上に達したことを検出
した場合は、ステップＳ１６に進み、加熱炉１の設定温
度を維持するように制御する。加熱炉１の燃焼を停止す
るか否かは、ステップＳ１７で判定し、燃焼停止の場合
は、ステップＳ１８に進み、燃料投入用バーナの燃料供
給量を徐々に削減して燃焼を停止する。Regarding the combustion method of the heating furnace of FIG. 7, FIG.
It is a modified example of FIG. 2 and is a heating furnace in which a normal type burner is used instead of the regenerative alternating combustion burner 4 (described with reference to FIG. 3). In the figure, steps S10 to S
Reference numeral 12 is a step of supplying the fuel to raise the temperature inside the heating furnace 1 until the temperature reaches the fuel ignition temperature. It is a burner that mixes combustion air and fuel of a normal system and supplies them to the inside of the furnace for combustion. The burner is ignited, and the combustion air and fuel are supplied to the burner and burned to raise the temperature inside the heating furnace 1. It is heated and the fuel supply amount is increased stepwise until the fuel ignition temperature is reached. When the in-furnace temperature reaches or exceeds the fuel ignition temperature, the process proceeds to step S13. To detect the furnace temperature, the output from the temperature sensor 10 is input to the control unit 13, and the control unit 13 determines whether the furnace temperature is the fuel ignition temperature or higher, and the furnace temperature is the fuel ignition temperature or higher. When it is detected, in step S13, the combustion by the normal type burner is switched to the fuel charging burner 3. In step S14, the fuel is supplied from the fuel charging burner 3 and the upper portion 2 of the heating furnace 1
Combustion air according to the amount of combustion is supplied from the air nozzles 5 provided on the a and lower portions 2b. Also, the other air nozzle 5
The combustion exhaust gas is discharged from the. The combustion is continued while the supply of the combustion air A and the discharge of the combustion exhaust gas B by the air nozzle 5 are alternately switched. In step S15, the control unit 13 determines whether or not the furnace temperature has reached the set temperature or higher (fuel ignition temperature or higher), and if it is detected that the set temperature or higher has been reached, the process proceeds to step S16. The heating furnace 1 is controlled to maintain the set temperature. Whether or not to stop the combustion of the heating furnace 1 is determined in step S17. When the combustion is stopped, the process proceeds to step S18, and the fuel supply amount of the fuel charging burner is gradually reduced to stop the combustion.

【００３６】図８は、図２に示す加熱炉の燃焼制御方法
であり、従来式バーナ１５による加熱炉である。バーナ
１５は、燃料供給系と燃焼空気供給系からなり、制御弁
１５ａ，１５ｂが設けられている。同図に於いて、ステ
ップＳ２０乃至Ｓ２２は、バーナ１５を燃焼させて加熱
炉内温度を燃料着火温度以上にするためのステップであ
る。ステップＳ２２で燃料着火温度以上に達すると、ス
テップＳ２３に進み、バーナ１５の制御弁１５ａをより
開いて燃料供給量を増大させる。同時に空気ノズルから
燃焼量に応じて燃焼空気を供給するとともに、他方の空
気ノズルから燃焼排ガスを排出する。この空気ノズルに
よる燃焼空気を供給と燃焼排ガスを排出を交互に切り換
えて行う。ステップＳ２４に進み、制御弁１５ａの一層
開いて燃料の供給量を増加させ燃焼空気量も増大させ
る。ステップＳ２５に進み、炉内温度が所定の値に達し
たか否かを制御部で判断する。ステップＳ２６に進み、
炉内温度を設定温度に維持するように燃焼を継続し、ス
テップＳ２７に進む。ステップＳ２７で燃焼終了しない
場合は、ステップＳ２６に進み、燃焼終了である場合
は、ステップＳ２８に進む。ステップＳ２８では燃料供
給量を徐々に削減をして燃焼を終了して停止する。FIG. 8 shows a combustion control method for the heating furnace shown in FIG. 2, which is a heating furnace using the conventional burner 15. The burner 15 is composed of a fuel supply system and a combustion air supply system, and is provided with control valves 15a and 15b. In the figure, steps S20 to S22 are steps for burning the burner 15 to raise the temperature in the heating furnace to the fuel ignition temperature or higher. When the temperature reaches the fuel ignition temperature or higher in step S22, the process proceeds to step S23, and the control valve 15a of the burner 15 is further opened to increase the fuel supply amount. At the same time, the combustion air is supplied from the air nozzle according to the amount of combustion, and the combustion exhaust gas is discharged from the other air nozzle. The supply of combustion air and the discharge of combustion exhaust gas by this air nozzle are alternately switched. In step S24, the control valve 15a is further opened to increase the fuel supply amount and the combustion air amount. In step S25, the control unit determines whether the furnace temperature has reached a predetermined value. Go to step S26,
Combustion is continued so as to maintain the temperature in the furnace at the set temperature, and the process proceeds to step S27. If the combustion is not ended in step S27, the process proceeds to step S26, and if the combustion is ended, the process proceeds to step S28. In step S28, the fuel supply amount is gradually reduced to end combustion and stop.

【００３７】[0037]

【発明の効果】以上説明したように、本発明は、燃焼空
気の供給系と燃焼排ガスの排出系を燃料供給系統とは分
離し、燃焼空気の供給経路と燃焼排ガスの排出経路の空
気ノズルに蓄熱体が設けられている。炉内温度を燃料着
火温度以上にした後に、燃料供給系統から燃料と空気ノ
ズルからの燃焼空気とを燃焼させ、空気ノズルによる燃
焼空気供給と燃焼排ガス排出を交互に切り換えて、燃焼
排ガスの顕熱を空気ノズルの蓄熱体に蓄積し、燃焼空気
を供給する際、蓄熱体に蓄積された熱によって燃焼空気
を高温予熱して炉内に供給する蓄熱式交番燃焼装置を備
える加熱炉であり、加熱炉の熱回収率を改善できるとと
もに、空気ノズルは加熱炉の天井部（上部）や底部（下
部，段部）に設けられているので、加熱炉の横方向の拡
張が防止でき、加熱炉の設置場所に制約を与えない効果
を有し、且つ燃焼空気が上方や下方から供給されるの
で、炉内温度の均一化に効果的である。As described above, according to the present invention, the combustion air supply system and the combustion exhaust gas discharge system are separated from the fuel supply system, and the air nozzles are provided in the combustion air supply path and the combustion exhaust gas discharge path. A heat storage body is provided. After raising the temperature in the furnace to the fuel ignition temperature or higher, burn the fuel from the fuel supply system and the combustion air from the air nozzle, and alternately switch the combustion air supply from the air nozzle and the exhaust gas discharge to sensible heat of the combustion exhaust gas. Is stored in the heat storage body of the air nozzle, and when supplying combustion air, it is a heating furnace equipped with a regenerative alternating combustion device that preheats the combustion air to a high temperature by the heat accumulated in the heat storage body and supplies it to the furnace. The heat recovery rate of the furnace can be improved, and since the air nozzles are installed at the ceiling (upper part) and bottom (lower part, step) of the heating furnace, lateral expansion of the heating furnace can be prevented and This has the effect of not limiting the installation location, and since combustion air is supplied from above and below, it is effective in making the temperature inside the furnace uniform.

【００３８】また、本発明によれば、通常方式のバーナ
や小型の蓄熱式交番燃焼バーナによって加熱炉を燃焼着
火温度に設定した後に、燃料投入用ノズルによって燃料
を供給する燃焼方式であり、加熱炉の側壁面に設けられ
る蓄熱式交番燃焼バーナの蓄熱体を小型にできるので、
この燃焼方式による加熱炉は、その設置場所に制約を与
えない利点がある。Further, according to the present invention, the combustion system is a combustion system in which the fuel is supplied by the fuel injection nozzle after the heating furnace is set to the combustion ignition temperature by the normal system burner or the small regenerative alternating combustion burner. Since the heat storage body of the heat storage type alternating combustion burner provided on the side wall surface of the furnace can be downsized,
The heating furnace based on this combustion method has an advantage of not restricting its installation place.

【００３９】また、本発明によれば、バーナによって加
熱炉を燃焼着火温度以上に設定した後に、バーナからの
燃料供給量を増大させ、且つ空気ノズルから燃焼空気を
供給して燃焼させて炉内温度を所定の値にする加熱炉で
あり、加熱炉の設置場所の制約が少なくなる利点があ
り、燃焼装置の無駄が極めて少ない利点があり、しかも
安価な加熱炉を提供できる利点がある。Further, according to the present invention, after the heating furnace is set to the combustion ignition temperature or higher by the burner, the fuel supply amount from the burner is increased, and the combustion air is supplied from the air nozzle to burn the inside of the furnace. It is a heating furnace that brings the temperature to a predetermined value, and there are advantages that there are less restrictions on the installation location of the heating furnace, that there is less waste of the combustion device, and that there is an advantage that an inexpensive heating furnace can be provided.

【００４０】また、本発明によれば、燃焼が自然着火す
る温度である燃焼着火温度以上に加熱炉を昇温した後
に、燃料を噴射して供給する加熱炉であり、燃焼空気と
燃料を別に供給するものであるので、比較的大型の蓄熱
式交番燃焼バーナ装置を設ける必要がなく、炉圧変動が
少ないので加熱炉側壁の強度を必要以上に厚くする必要
がなく、加熱炉の建設コストが安価もなのとなる効果を
有する。Further, according to the present invention, the heating furnace is heated to a temperature higher than the combustion ignition temperature, which is the temperature at which the combustion spontaneously ignites, and then the fuel is injected and supplied, and the combustion air and the fuel are separately supplied. Since it is supplied, it is not necessary to install a relatively large heat storage type alternating combustion burner device, and since there is little fluctuation in the furnace pressure, it is not necessary to increase the strength of the heating furnace side wall more than necessary, and the heating furnace construction cost is reduced. It also has the effect of being inexpensive.

【００４１】更に、本発明によれば、炉幅を極力小さく
し得ない場合や被加熱物が炉幅方向に長い場合に炉幅方
向の燃焼機器の寸法を最小にできるので設備設置上、極
めて効果的である。また、被加熱物が長い時は、天井に
設けた空気口の配置や燃焼用通気の吹込量を炉幅方向に
調節することで火炎長を自由に調節でき、被加熱物の全
長に渡って均一な加熱が可能となる利点がある。また、
長い炉幅の炉で片側に短い被加熱物を置いて加熱する時
は片側の炉壁からのみ燃料を投入し、その天井から燃焼
空気を送って運転することも可能であり、被加熱物の幅
に依存することなく、均一な加熱が可能である。Furthermore, according to the present invention, when the furnace width cannot be made as small as possible or when the object to be heated is long in the furnace width direction, the size of the combustion equipment in the furnace width direction can be minimized. It is effective. When the object to be heated is long, the flame length can be freely adjusted by adjusting the arrangement of the air ports provided on the ceiling and the blowing amount of combustion ventilation in the furnace width direction, and There is an advantage that uniform heating is possible. Also,
When heating a short object to be heated on one side in a furnace with a long furnace width, it is also possible to put fuel only from the furnace wall on one side and to operate by sending combustion air from its ceiling. Uniform heating is possible without depending on the width.

【図面の簡単な説明】[Brief description of drawings]

【図１】（ａ）は本発明に係る加熱炉の一実施例の縦方
向断面図、（ｂ）はその横方向断面図である。1A is a longitudinal sectional view of an embodiment of a heating furnace according to the present invention, and FIG. 1B is a lateral sectional view thereof.

【図２】本発明に係る加熱炉の断面図である。FIG. 2 is a sectional view of a heating furnace according to the present invention.

【図３】本発明の蓄熱式燃焼装置を備える加熱図であ
り、その制御系を示すブロック図を備えたものである。FIG. 3 is a heating diagram provided with the heat storage type combustion device of the present invention, and is provided with a block diagram showing a control system thereof.

【図４】（ａ），（ｂ）は燃焼状態を説明するための説
明図である。4A and 4B are explanatory diagrams for explaining a combustion state.

【図５】燃焼状態を説明するための図である。FIG. 5 is a diagram for explaining a combustion state.

【図６】本発明の加熱炉の燃焼制御方法を示す図であ
る。FIG. 6 is a diagram showing a combustion control method for a heating furnace according to the present invention.

【図７】本発明の加熱炉の燃焼制御方法を示す図であ
る。FIG. 7 is a diagram showing a combustion control method for a heating furnace according to the present invention.

【図８】本発明の加熱炉の燃焼制御方法を示す図であ
る。FIG. 8 is a diagram showing a combustion control method for a heating furnace according to the present invention.

【図９】（ａ），（ｂ）は従来の加熱炉の一例を示す図
である。9 (a) and 9 (b) are diagrams showing an example of a conventional heating furnace.

【符号の説明】[Explanation of symbols]

１ 加熱炉 ２ 加熱炉本体 ２ａ 天井部（上部） ２ｂ 底部（段差部，下部） ３ 燃料投入用ノズル ３ａ 制御弁 ４ 蓄熱式交番燃焼バーナ ５ 空気ノズル ６ 蓄熱体 ８1 〜８4 制御弁 ９1 〜９4 切換制御弁 １０ 温度センサ １１ フアン １２ ダクト １３ 制御部 １５ 従来式バーナ １５ａ 制御弁 １５ｂ 制御弁First heating furnace 2 furnace body 2a ceiling (top) 2b bottom (stepped portion, bottom) 3 fuel input nozzle 3a control valve 4 regenerative alternate combustion burner 5 air nozzles 6 regenerator 8 1-8 4 control valve 9 1 -9 4 Switching control valve 10 Temperature sensor 11 Fan 12 Duct 13 Control unit 15 Conventional burner 15a Control valve 15b Control valve

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ２７Ｄ 17/00 １０１ Ｆ２７Ｄ 17/00 １０１Ａ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location F27D 17/00 101 F27D 17/00 101A

Claims (9)

【特許請求の範囲】[Claims] 【請求項１】 加熱炉上部に蓄熱体を備える空気ノズル
を複数設け、前記加熱炉内の温度を燃料着火温度以上に
昇温した後に、炉内への燃料供給量を増大させるととも
に、前記空気ノズルの一方から燃焼量に応じた燃焼空気
を炉内に供給して燃焼させ、前記空気ノズルの他方から
燃焼排ガスを炉外に排出するようにし、前記空気ノズル
による燃焼空気の供給と燃焼排ガスの排出を所定の間隔
で交互に切り換えるようにしたことを特徴とする加熱
炉。1. A plurality of air nozzles provided with a heat storage material are provided in the upper part of a heating furnace, and after the temperature inside the heating furnace is raised to a fuel ignition temperature or higher, the fuel supply amount into the furnace is increased and the air is supplied. The combustion air corresponding to the combustion amount is supplied from one of the nozzles to the inside of the furnace for combustion, and the combustion exhaust gas is discharged to the outside of the furnace from the other of the air nozzles. A heating furnace characterized in that discharge is alternately switched at predetermined intervals. 【請求項２】 加熱炉本体の側壁に加熱炉内の温度を昇
温するバーナを備え、前記加熱炉上部に蓄熱体を備える
空気ノズルを備え、炉内温度を前記バーナで燃料着火温
度以上に昇温した後に、前記バーナから炉内に供給され
る燃料を増加させるとともに、前記空気ノズルの半数か
ら燃焼量に応じた燃焼空気を供給して燃焼させ、前記空
気ノズルの他の半数から燃焼排ガスを炉外に排出するよ
うにし、前記空気ノズルを所定の間隔で交互に切り換え
て燃焼空気の供給と燃焼排ガスの排出を行うようにした
ことを特徴とする加熱炉。2. A burner for raising the temperature in the heating furnace is provided on a side wall of the heating furnace body, an air nozzle provided with a heat storage body is provided in an upper portion of the heating furnace, and the temperature in the furnace is set to a fuel ignition temperature or higher by the burner. After increasing the temperature, the fuel supplied from the burner into the furnace is increased, and the combustion air corresponding to the combustion amount is supplied from the half of the air nozzles to burn, and the combustion exhaust gas is discharged from the other half of the air nozzles. Is discharged to the outside of the furnace, and the air nozzles are alternately switched at predetermined intervals to supply combustion air and discharge combustion exhaust gas. 【請求項３】 加熱炉本体の側壁にバーナと燃料投入用
ノズルとを備え、且つ、前記加熱炉上部に蓄熱体を備え
る空気ノズルを備え、前記バーナによって炉内温度を燃
料着火温度以上に昇温した後に、前記燃料投入用ノズル
から炉内に燃料を供給するとともに、前記空気ノズルの
一方から供給される燃焼空気によって燃焼させ、前記空
気ノズルの他方から燃焼排ガスを炉外に排出するように
し、所定の間隔で前記空気ノズルを交互に切り換えて燃
焼空気の供給と燃焼排ガスの排出を行うことを特徴とす
る加熱炉。3. A burner and a fuel injection nozzle are provided on a side wall of the heating furnace main body, and an air nozzle having a heat storage body is provided on an upper portion of the heating furnace, and the burner raises the temperature in the furnace to a temperature higher than a fuel ignition temperature. After heating, the fuel is supplied from the fuel injection nozzle into the furnace, and is burned by the combustion air supplied from one of the air nozzles, and the flue gas is discharged from the other of the air nozzles to the outside of the furnace. A heating furnace characterized by alternately switching the air nozzles at predetermined intervals to supply combustion air and discharge combustion exhaust gas. 【請求項４】 加熱炉の炉本体側壁に設けられた炉内温
度を燃料着火温度以上に昇温した後、燃料のみを増大さ
せるバーナと、 前記加熱炉の上部に設けられた蓄熱体を備える空気ノズ
ルとを具備し、 前記空気ノズルによる燃焼空気の供給と燃焼排ガスの排
出を所定の間隔で交互に切り換えて行うようにしたこと
を特徴とする加熱炉。4. A burner provided on the side wall of the furnace body of the heating furnace to increase only the fuel after raising the temperature inside the furnace to a temperature higher than the fuel ignition temperature, and a heat storage body provided at the upper part of the heating furnace. A heating furnace comprising an air nozzle, wherein the supply of combustion air and the discharge of combustion exhaust gas by the air nozzle are alternately switched at predetermined intervals. 【請求項５】 加熱炉の側壁に設けられている炉内温度
を燃料着火温度以上に昇温するバーナまたは蓄熱式交番
燃焼バーナと、 燃料着火温度以上の温度に設定された炉内に燃料を噴射
する加熱炉側壁に設けられた燃料投入用ノズルと、 前記加熱炉の上部に設けられた蓄熱体を備える空気ノズ
ルとを具備し、 前記空気ノズルによる燃焼空気の供給と燃焼排ガスの排
出を所定の間隔で交互に切り換えるようにしたことを特
徴とする加熱炉。5. A burner or a regenerative alternating combustion burner provided on the side wall of the heating furnace for raising the temperature in the furnace to a fuel ignition temperature or higher, and a fuel set in the furnace set to a temperature higher than the fuel ignition temperature. A fuel injection nozzle provided on the side wall of the heating furnace for injection, and an air nozzle provided with a heat storage body provided at the upper part of the heating furnace are provided, and the supply of combustion air and the discharge of combustion exhaust gas by the air nozzle are predetermined. A heating furnace characterized by being switched alternately at intervals of. 【請求項６】 加熱炉の本体側壁に備えられた炉内温度
を燃料着火温度以上に昇温し、前記炉内温度が燃料着火
温度以上の温度に達した後に燃料の供給量を増大させる
バーナと、 前記加熱炉上部に設けられ、燃焼空気の供給と燃焼排ガ
スの排出を交互に行う蓄熱体を備える空気ノズルと、 前記炉内温度を計測して燃料着火温度以上であるか否か
を検出する検出手段と、 前記検出手段に基づいて前記バーナから供給させる燃料
供給量を増大させる燃焼制御手段と、 前記空気ノズルによる炉内への燃焼空気の供給と炉外へ
の燃焼排ガスの排出を交互に切り換える切換制御手段
と、を備えることを特徴とする加熱炉に備えられた蓄熱
式燃焼装置。6. A burner for increasing a temperature of a furnace provided on a side wall of a main body of a heating furnace to a fuel ignition temperature or higher and increasing a fuel supply amount after the furnace temperature reaches a temperature of the fuel ignition temperature or higher. An air nozzle provided in the upper part of the heating furnace, the air nozzle having a heat storage body that alternately supplies the combustion air and discharges the combustion exhaust gas, and measures whether or not the temperature in the furnace is equal to or higher than the fuel ignition temperature. Detecting means, combustion control means for increasing the fuel supply amount supplied from the burner based on the detecting means, and supply of combustion air into the furnace by the air nozzle and discharge of combustion exhaust gas to the outside of the furnace And a switching control means for switching to the heat storage type combustion apparatus provided in the heating furnace. 【請求項７】 加熱炉の本体側壁に備えられ、炉内温度
を燃料着火温度以上の温度に昇温するバーナと、 前記加熱炉内温度が燃料着火温度以上の温度に達した後
に燃料のみを供給する燃料投入用ノズルと、 前記加熱炉上部に備えられた前記加熱炉への燃焼空気の
供給と燃焼排ガスの排出を交互になし得る蓄熱体を備え
る空気ノズルと、 前記炉内温度が燃料着火温度以上の温度であるか否かを
検出する検出手段と、 前記検出手段に基づいて前記バーナから前記燃料投入用
ノズルに切り換えて燃焼させる燃焼制御手段と、 前記空気ノズルを介して炉内への燃焼空気の供給と炉外
への燃焼排ガスの排出を所定の間隔で交互に切り換える
切換制御手段と、を備えること特徴とする加熱炉に備え
られた蓄熱式燃焼装置。7. A burner provided on the side wall of the main body of the heating furnace for raising the temperature inside the furnace to a temperature above the fuel ignition temperature; and only the fuel after the temperature inside the heating furnace reaches a temperature above the fuel ignition temperature. A fuel injection nozzle to be supplied, an air nozzle provided with a heat storage body that can alternately supply the combustion air to the heating furnace and discharge the combustion exhaust gas provided in the upper part of the heating furnace, and the temperature in the furnace is fuel ignition. Detection means for detecting whether or not the temperature is equal to or higher than the temperature, combustion control means for switching from the burner to the fuel injection nozzle for combustion based on the detection means, and into the furnace through the air nozzle. A heat storage type combustion apparatus provided in a heating furnace, comprising: a switching control unit that alternately switches supply of combustion air and discharge of combustion exhaust gas to the outside of the furnace at predetermined intervals. 【請求項８】 加熱炉側壁に設けられたバーナによる燃
焼によって炉内温度を燃料着火温度以上の温度に昇温し
た後、前記バーナから炉内に供給される燃料を増大させ
るとともに、前記加熱炉上部に設けられた蓄熱体を備え
る空気ノズルを介して燃焼量に応じた燃焼空気を供給
し、他の蓄熱体を備える空気ノズルから燃焼排ガスを排
出するようにし、前記空気ノズルを介してなされる燃焼
空気の炉内への供給と燃焼排ガスの炉外への排出を所定
の間隔で交互に切り換えるようにして、炉内温度を制御
することを特徴とする加熱炉の燃焼方法。8. The fuel supplied to the furnace from the burner is increased after the temperature inside the furnace is raised to a temperature above the fuel ignition temperature by combustion by a burner provided on the side wall of the furnace, and the furnace is heated. Combustion air according to the amount of combustion is supplied through an air nozzle provided with a heat storage body provided in the upper part, and combustion exhaust gas is discharged from an air nozzle provided with another heat storage body, which is performed through the air nozzle. A combustion method for a heating furnace, characterized in that the temperature in the furnace is controlled by alternately switching supply of combustion air into the furnace and discharge of combustion exhaust gas to the outside of the furnace at predetermined intervals. 【請求項９】 加熱炉側壁に設けられたバーナによる燃
焼によって炉内温度を燃料着火温度以上の温度に昇温し
た後、加熱炉側壁に設けられた燃焼投入用ノズルから炉
内に燃料を供給し、前記加熱炉上部に設けられた蓄熱体
を備える空気ノズルを介して燃焼量に応じた燃焼空気を
供給するとともに、燃焼排ガスを他の蓄熱体を備える空
気ノズルから排出し、前記燃焼空気の炉内への供給と燃
焼排ガスの炉外への排出を所定の間隔で交互に切り換え
るようにして、炉内温度を制御することを特徴とする加
熱炉の燃焼方法。9. A fuel is supplied into the furnace from a combustion injection nozzle provided on the side wall of the heating furnace after the temperature inside the furnace is raised to a temperature higher than a fuel ignition temperature by combustion by a burner provided on the side wall of the heating furnace. Then, while supplying combustion air according to the amount of combustion through an air nozzle provided with a heat storage body provided in the heating furnace upper part, the combustion exhaust gas is discharged from an air nozzle provided with another heat storage body, and the combustion air A combustion method for a heating furnace, characterized in that the temperature inside the furnace is controlled by alternately switching supply and discharge of combustion exhaust gas to the outside of the furnace at predetermined intervals.
JP23018395A 1995-09-07 1995-09-07 Heating furnace, regenerative combustion device and combustion method Expired - Fee Related JP3341542B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23018395A JP3341542B2 (en) 1995-09-07 1995-09-07 Heating furnace, regenerative combustion device and combustion method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23018395A JP3341542B2 (en) 1995-09-07 1995-09-07 Heating furnace, regenerative combustion device and combustion method

Publications (2)

Publication Number Publication Date
JPH0978123A true JPH0978123A (en) 1997-03-25
JP3341542B2 JP3341542B2 (en) 2002-11-05

Family

ID=16903906

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23018395A Expired - Fee Related JP3341542B2 (en) 1995-09-07 1995-09-07 Heating furnace, regenerative combustion device and combustion method

Country Status (1)

Country Link
JP (1) JP3341542B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101320406B1 (en) * 2013-01-17 2013-10-23 한국기계연구원 Superlow-nox combustion apparatus using high temperature fgr and coanda effect
CN104748568A (en) * 2015-04-03 2015-07-01 首钢总公司 Heating method and system based on steel rolling heating furnace
CN109210952A (en) * 2017-07-07 2019-01-15 中外炉工业株式会社 Heat-treatment furnace

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101320406B1 (en) * 2013-01-17 2013-10-23 한국기계연구원 Superlow-nox combustion apparatus using high temperature fgr and coanda effect
WO2014112725A1 (en) * 2013-01-17 2014-07-24 한국기계연구원 High-temperature fgr ultra-low nox combustor using coanda effect
JP2015510577A (en) * 2013-01-17 2015-04-09 コリア インスティテュート オブ マシーナリィ アンド マテリアルズ High temperature FGR ultra-low NOx combustion system using Coanda effect
CN105209825A (en) * 2013-01-17 2015-12-30 韩国机械研究院 Superlow-Nox combustion apparatus using high temperature FGR and Coanda effect
CN105209825B (en) * 2013-01-17 2017-03-29 韩国机械研究院 Using high temperature FGR and the super low NOx combustion apparatus of Coanda effect
CN104748568A (en) * 2015-04-03 2015-07-01 首钢总公司 Heating method and system based on steel rolling heating furnace
CN109210952A (en) * 2017-07-07 2019-01-15 中外炉工业株式会社 Heat-treatment furnace
CN109210952B (en) * 2017-07-07 2021-08-31 中外炉工业株式会社 Heat treatment furnace

Also Published As

Publication number Publication date
JP3341542B2 (en) 2002-11-05

Similar Documents

Publication Publication Date Title
JP3282944B2 (en) Low NOx burner
JPH05118764A (en) Steel heating furnace
JP3341542B2 (en) Heating furnace, regenerative combustion device and combustion method
JP3267140B2 (en) Heating furnace, combustion control method thereof, and combustion control device
JP3396922B2 (en) Continuous heating furnace and combustion method thereof
TW200506303A (en) Process for controlling the temperature homogeneity of the products in an iron and steelworks reheat furnace, and reheat furnace
JP3095964B2 (en) Combustion control method for regenerative combustion burner system
JP3149666B2 (en) Radiant heating device and combustion method thereof
JP3419917B2 (en) Continuous heating device
JPH07120171A (en) Method of operating heating oven including heat storage alternate combustion burner system
JP3799841B2 (en) Operating method of heating furnace
JP2985602B2 (en) Heating furnace with regenerative alternating combustion burner system
JPH09111350A (en) Continuous heating furnace and operation thereof
JPH06200329A (en) Operation of continuous heating furnace having regenerative type burner
JP3425705B2 (en) Method of controlling regenerative burner group
US3331594A (en) Method and apparatus for scale free heating of metals
JP3414942B2 (en) heating furnace
EP0696707A2 (en) A regenerative burner, a combustion system and a method of burning
JP2894174B2 (en) Combustion control method for continuous heating furnace
JP3007275B2 (en) NOx control method for regenerative combustion burner system
JPH08159448A (en) Nox-restraining method of regenerative combustion burner system
JPH07280258A (en) Combustion controlling method for burner of industrial kiln
JP3656930B2 (en) Industrial furnace
JPH07118753A (en) Heating method of heating furnace
JP2001183071A (en) Thyristor-controlled smokeless kerosene furnace

Legal Events

Date Code Title Description
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20020723

LAPS Cancellation because of no payment of annual fees