JP5404532B2 - Combustion control method of heat storage combustion type heat treatment furnace - Google Patents

Combustion control method of heat storage combustion type heat treatment furnace Download PDF

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JP5404532B2
JP5404532B2 JP2010127569A JP2010127569A JP5404532B2 JP 5404532 B2 JP5404532 B2 JP 5404532B2 JP 2010127569 A JP2010127569 A JP 2010127569A JP 2010127569 A JP2010127569 A JP 2010127569A JP 5404532 B2 JP5404532 B2 JP 5404532B2
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combustion
heat storage
fuel gas
supply pipe
regenerative
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JP2011252669A (en
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康之 木本
秀人 幕谷
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Chugai Ro Co Ltd
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Chugai Ro Co Ltd
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Priority to TW100115903A priority patent/TWI447331B/en
Priority to CN201110150831.3A priority patent/CN102269518B/en
Priority to KR1020110052028A priority patent/KR101430790B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/66—Preheating the combustion air or gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00—Heating of air supplied for combustion
    • F23L15/02—Arrangements of regenerators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2208/00—Control devices associated with burners
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Supply (AREA)
  • Furnace Details (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Combustion (AREA)
  • Gas Burners (AREA)

Description

本発明は、燃料ガス供給管を備えたバーナ部と、蓄熱材を収容させた蓄熱室と、蓄熱室に燃焼用空気を供給する空気供給管と、蓄熱室から燃焼排ガスを排出させる排ガス排出管とを有する少なくとも一対の蓄熱式バーナが設けられ、一方の蓄熱式バーナにおいて、空気供給管から蓄熱室を通して燃焼用空気をバーナ部に導くと共に、このバーナ部における燃料ガス供給管から燃料ガスを噴射させて燃焼動作を行う一方、他方の蓄熱式バーナにおいて、燃焼排ガスを上記の蓄熱室に導いて燃焼排ガスの熱を蓄熱材に蓄熱させて排ガス排出管から排出させる蓄熱動作を行い、この一対の蓄熱式バーナにおける上記の燃焼動作と蓄熱動作とを交互に切り替えるようにした蓄熱燃焼式熱処理炉の燃焼制御方法に関するものである。特に、上記の蓄熱燃焼式熱処理炉において、各蓄熱式バーナにおける燃料ガス供給管から供給される燃料ガスの供給量と、空気供給管から供給される燃焼用空気の供給量とを一定化させて、適切な燃焼が安定して行えるようにした点に特徴を有するものである。   The present invention relates to a burner section provided with a fuel gas supply pipe, a heat storage chamber containing a heat storage material, an air supply pipe for supplying combustion air to the heat storage chamber, and an exhaust gas discharge pipe for discharging combustion exhaust gas from the heat storage chamber And at least one pair of regenerative burners, wherein one of the regenerative burners guides combustion air from the air supply pipe through the heat storage chamber to the burner section and injects fuel gas from the fuel gas supply pipe in the burner section. On the other hand, in the other regenerative burner, the regenerative burner conducts a regenerative operation in which the flue gas is guided to the heat storage chamber and the heat of the flue gas is stored in the heat storage material and discharged from the exhaust gas discharge pipe. The present invention relates to a combustion control method for a heat storage combustion heat treatment furnace in which the above-described combustion operation and heat storage operation in a heat storage burner are alternately switched. In particular, in the above heat storage combustion heat treatment furnace, the supply amount of the fuel gas supplied from the fuel gas supply pipe in each heat storage burner and the supply amount of the combustion air supplied from the air supply pipe are made constant. It is characterized in that appropriate combustion can be performed stably.

従来から、被処理材を熱処理するにあたり、燃料ガス供給管を備えたバーナ部と、蓄熱材を収容させた蓄熱室と、蓄熱室に燃焼用空気を供給する空気供給管と、蓄熱室から燃焼排ガスを排出させる排ガス排出管とを有する少なくとも一対の蓄熱式バーナが設けられた蓄熱燃焼式熱処理炉を用い、一方の蓄熱式バーナにおいて、空気供給管から蓄熱室を通して燃焼用空気をバーナ部に導くと共に、このバーナ部における燃料ガス供給管から燃料ガスを噴射させて燃焼動作を行う一方、他方の蓄熱式バーナにおいて、燃焼排ガスを上記の蓄熱室に導いて、燃焼排ガスの熱を蓄熱材に蓄熱させて排ガス排出管から排出させる蓄熱動作を行い、この一対の蓄熱式バーナにおける上記の燃焼動作と蓄熱動作とを交互に切り替えることが行われている。   Conventionally, when heat treating a material to be treated, a burner unit provided with a fuel gas supply pipe, a heat storage chamber containing a heat storage material, an air supply pipe supplying combustion air to the heat storage chamber, and combustion from the heat storage chamber Using a regenerative combustion heat treatment furnace provided with at least a pair of regenerative burners having exhaust gas discharge pipes for discharging exhaust gas, and in one regenerative burner, the combustion air is led from the air supply pipe to the burner section through the regenerative chamber. At the same time, the combustion operation is performed by injecting fuel gas from the fuel gas supply pipe in the burner section, while in the other heat storage type burner, the combustion exhaust gas is guided to the heat storage chamber, and the heat of the combustion exhaust gas is stored in the heat storage material. Thus, a heat storage operation for discharging from the exhaust gas discharge pipe is performed, and the combustion operation and the heat storage operation in the pair of heat storage burners are alternately switched.

また、上記の蓄熱燃焼式熱処理炉において、被処理材を連続して熱処理するため、上記の熱処理炉に複数対の蓄熱式バーナを設け、各対の蓄熱式バーナにおいて、燃焼動作と蓄熱動作とを切り替えるタイミングを異ならせるようにしたものも用いられている。   Further, in the above heat storage combustion type heat treatment furnace, in order to continuously heat treat the material to be treated, a plurality of pairs of heat storage burners are provided in the heat treatment furnace, and in each pair of heat storage burners, combustion operation and heat storage operation are performed. What changed the timing which switches is also used.

また、上記の蓄熱燃焼式熱処理炉において、上記の各蓄熱式バーナにおける燃料ガス供給管に燃料ガスを供給するにあたり、一定量の燃料ガスを供給する燃料ガス供給装置から各燃料ガス供給管に燃料ガスを供給させることが一般に行われている。   Further, in the above-described heat storage combustion heat treatment furnace, when supplying fuel gas to the fuel gas supply pipe in each of the above heat storage burners, fuel is supplied to each fuel gas supply pipe from a fuel gas supply device that supplies a certain amount of fuel gas. In general, gas is supplied.

ここで、上記のような蓄熱燃焼式熱処理炉において、一対の蓄熱式バーナにおける燃焼動作と蓄熱動作とを交互に切り替えるにあたり、従来においては、特許文献１，２に示されるように、燃焼動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給を停止させた後、空気供給管における燃焼用空気の供給を停止させる一方、蓄熱動作中の蓄熱式バーナにおいて、空気供給管における燃焼用空気の供給を開始させた後、燃料ガス供給管における燃料ガスの供給を開始させるようにしたものが示されている。   Here, in the heat storage combustion type heat treatment furnace as described above, when alternately switching between the combustion operation and the heat storage operation in the pair of heat storage type burners, conventionally, as shown in Patent Documents 1 and 2, during the combustion operation, In the regenerative burner, after stopping the supply of fuel gas in the fuel gas supply pipe, the supply of combustion air in the air supply pipe is stopped, while in the regenerative burner during the heat storage operation, for the combustion in the air supply pipe In the figure, the supply of fuel gas in the fuel gas supply pipe is started after the supply of air is started.

しかし、上記のように蓄熱燃焼式熱処理炉に複数対の蓄熱式バーナを設け、各対の蓄熱式バーナにおいて、燃焼動作と蓄熱動作とを切り替えるタイミングを異ならせると共に、燃料ガス供給装置から一定量の燃料ガスを各燃料ガス供給管に供給させるようにした蓄熱燃焼式熱処理炉の場合、燃焼動作と蓄熱動作との切り替えを行う一対の蓄熱式バーナにおいては、上記のように燃料ガス供給管を通してから供給される燃料ガスの量が一時的に停止する結果、燃料ガス供給装置から他の蓄熱式バーナ対における燃料ガス供給管に供給される燃料ガスの量が増加するようになる。このため、他の蓄熱式バーナ対においては、燃焼用空気に対する燃料ガスの比率が高くなって、燃焼状態が変動し、適切な燃焼を安定して行うことができなくなるという問題があった。特に、上記の燃料ガスとして、燃焼性の悪いガス、例えばプロパンガスを使用した場合、燃焼用空気に対するプロパンガスの比率が高くなると、不完全燃焼による黒煙（煤）が発生して、環境上問題が生じたり、被処理材に煤が付着して熱処理が適切に行えなくなったりするという問題があった。   However, as described above, a plurality of pairs of regenerative burners are provided in the regenerative combustion heat treatment furnace, and in each pair of regenerative burners, the timing for switching between the combustion operation and the heat storage operation is different, and a certain amount is supplied from the fuel gas supply device. In the case of a regenerative combustion heat treatment furnace in which the fuel gas is supplied to each fuel gas supply pipe, in a pair of regenerative burners that switch between the combustion operation and the heat storage operation, the fuel gas supply pipe is passed through as described above. As a result of the temporary stop of the amount of fuel gas supplied from the fuel gas supply device, the amount of fuel gas supplied from the fuel gas supply device to the fuel gas supply pipes in the other regenerative burner pairs increases. For this reason, in other regenerative burner pairs, there is a problem that the ratio of the fuel gas to the combustion air increases, the combustion state fluctuates, and appropriate combustion cannot be performed stably. In particular, when a gas with poor flammability, such as propane gas, is used as the above fuel gas, if the ratio of propane gas to combustion air increases, black smoke (soot) is generated due to incomplete combustion, resulting in environmental problems. There has been a problem that a problem arises, or that soot adheres to the material to be treated and heat treatment cannot be performed properly.

特開平１０−１８５１７６号公報JP-A-10-185176 特開平１１−１５９７４４号公報JP 11-159744 A

本発明は、燃料ガス供給管を備えたバーナ部と、蓄熱材を収容させた蓄熱室と、蓄熱室に燃焼用空気を供給する空気供給管と、蓄熱室から燃焼排ガスを排出させる排ガス排出管とを有する少なくとも一対の蓄熱式バーナが設けられ、一方の蓄熱式バーナにおいて、空気供給管から蓄熱室を通して燃焼用空気をバーナ部に導くと共に、このバーナ部における燃料ガス供給管から燃料ガスを噴射させて燃焼動作を行う一方、他方の蓄熱式バーナにおいて、燃焼排ガスを上記の蓄熱室に導いて燃焼排ガスの熱を蓄熱材に蓄熱させて排ガス排出管から排出させる蓄熱動作を行い、この一対の蓄熱式バーナにおける上記の燃焼動作と蓄熱動作とを交互に切り替えるようにした蓄熱燃焼式熱処理炉における上記のような問題を解決することを課題とするものである。   The present invention relates to a burner section provided with a fuel gas supply pipe, a heat storage chamber containing a heat storage material, an air supply pipe for supplying combustion air to the heat storage chamber, and an exhaust gas discharge pipe for discharging combustion exhaust gas from the heat storage chamber And at least one pair of regenerative burners, wherein one of the regenerative burners guides combustion air from the air supply pipe through the heat storage chamber to the burner section and injects fuel gas from the fuel gas supply pipe in the burner section. On the other hand, in the other regenerative burner, the regenerative burner conducts a regenerative operation in which the flue gas is guided to the heat storage chamber and the heat of the flue gas is stored in the heat storage material and discharged from the exhaust gas discharge pipe. It is also an object to solve the above problems in a heat storage combustion heat treatment furnace in which the above combustion operation and heat storage operation in the heat storage burner are alternately switched. It is.

すなわち、本発明においては、一対の蓄熱式バーナにおける上記の燃焼動作と蓄熱動作とを交互に切り替えるにあたり、各蓄熱式バーナにおける燃料ガス供給管から供給される燃料ガスの供給量と、空気供給管から供給される燃焼用空気の供給量とを一定化させて、適切な燃焼が安定して行えるようにすることを課題とするものである。   That is, in the present invention, when the combustion operation and the heat storage operation in the pair of heat storage burners are alternately switched, the supply amount of the fuel gas supplied from the fuel gas supply pipe in each heat storage burner and the air supply pipe An object of the present invention is to stabilize the supply amount of the combustion air supplied from the engine so that appropriate combustion can be stably performed.

本発明においては、上記のような課題を解決するため、燃料ガス供給管を備えたバーナ部と、蓄熱材を収容させた蓄熱室と、蓄熱室に燃焼用空気を供給する空気供給管と、蓄熱室から燃焼排ガスを排出させる排ガス排出管とを有する少なくとも一対の蓄熱式バーナが設けられ、一方の蓄熱式バーナにおいて、空気供給管から蓄熱室を通して燃焼用空気をバーナ部に導くと共に、このバーナ部における燃料ガス供給管から燃料ガスを噴射させて燃焼動作を行う一方、他方の蓄熱式バーナにおいて、燃焼排ガスを上記の蓄熱室に導いて燃焼排ガスの熱を蓄熱材に蓄熱させて排ガス排出管から排出させる蓄熱動作を行い、この一対の蓄熱式バーナにおける上記の燃焼動作と蓄熱動作とを交互に切り替える蓄熱燃焼式熱処理炉の燃焼制御方法において、上記の一対の蓄熱式バーナにおける燃焼動作と蓄熱動作とを切り替えるにあたり、燃焼動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給量と、空気供給管における燃焼用空気の供給量とを定常燃焼状態から減少させる一方、蓄熱動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給量と、空気供給管における燃焼用空気の供給量とを停止状態から増加させ、上記の一対の蓄熱式バーナにおいて、燃料ガス供給管から供給される燃料ガスの供給量と、空気供給管から供給される燃焼用空気の供給量とを一定化させると共に、一定量の燃料ガスを供給する燃料ガス供給装置から、上記の各蓄熱式バーナにおける燃料ガス供給管に燃料ガスを供給させるようにした。
また、本発明においては、上記のような課題を解決するため、燃料ガス供給管を備えたバーナ部と、蓄熱材を収容させた蓄熱室と、蓄熱室に燃焼用空気を供給する空気供給管と、蓄熱室から燃焼排ガスを排出させる排ガス排出管とを有する少なくとも一対の蓄熱式バーナが設けられ、一方の蓄熱式バーナにおいて、空気供給管から蓄熱室を通して燃焼用空気をバーナ部に導くと共に、このバーナ部における燃料ガス供給管から燃料ガスを噴射させて燃焼動作を行う一方、他方の蓄熱式バーナにおいて、燃焼排ガスを上記の蓄熱室に導いて燃焼排ガスの熱を蓄熱材に蓄熱させて排ガス排出管から排出させる蓄熱動作を行い、この一対の蓄熱式バーナにおける上記の燃焼動作と蓄熱動作とを交互に切り替える蓄熱燃焼式熱処理炉の燃焼制御方法において、上記の一対の蓄熱式バーナにおける燃焼動作と蓄熱動作とを切り替えるにあたり、燃焼動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給量と、空気供給管における燃焼用空気の供給量とを定常燃焼状態から減少させる一方、蓄熱動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給量と、空気供給管における燃焼用空気の供給量とを停止状態から増加させ、上記の一対の蓄熱式バーナにおいて、燃料ガス供給管から供給される燃料ガスの供給量と、空気供給管から供給される燃焼用空気の供給量とを一定化させると共に、燃焼動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給と、空気供給管における燃焼用空気の供給を停止させた後、排ガス排出管から燃焼排ガスを排出させる一方、蓄熱動作中の蓄熱式バーナにおいて、排ガス排出管から燃焼排ガスを排出させる操作を停止した後、燃料ガス供給管における燃料ガスの供給と、空気供給管における燃焼用空気の供給とを開始させるようにした。 In the present invention, in order to solve the problems as described above, a burner portion provided with a fuel gas supply pipe, a heat storage chamber containing a heat storage material, an air supply pipe for supplying combustion air to the heat storage chamber, At least a pair of regenerative burners having an exhaust gas discharge pipe for discharging combustion exhaust gas from the heat storage chamber is provided. In one heat storage burner, the combustion air is led from the air supply pipe through the heat storage chamber to the burner section. The fuel gas is injected from the fuel gas supply pipe in the section to perform the combustion operation, while in the other heat storage burner, the combustion exhaust gas is guided to the heat storage chamber, and the heat of the combustion exhaust gas is stored in the heat storage material, and the exhaust gas discharge pipe In a combustion control method for a heat storage combustion heat treatment furnace that performs a heat storage operation to be discharged from the combustion chamber and alternately switches between the combustion operation and the heat storage operation in the pair of heat storage burners. In switching between the combustion operation and the heat storage operation in the pair of heat storage burners, in the heat storage burner during the combustion operation, the supply amount of the fuel gas in the fuel gas supply pipe, the supply amount of the combustion air in the air supply pipe, In the regenerative burner during the heat storage operation, the fuel gas supply amount in the fuel gas supply pipe and the combustion air supply amount in the air supply pipe are increased from the stopped state, In the pair of regenerative burners, the supply amount of fuel gas supplied from the fuel gas supply pipe and the supply quantity of combustion air supplied from the air supply pipe are made constant, and a constant amount of fuel gas is supplied. The fuel gas is supplied from the fuel gas supply device to the fuel gas supply pipe in each of the heat storage burners .
In the present invention, in order to solve the above-described problems, a burner portion provided with a fuel gas supply pipe, a heat storage chamber containing a heat storage material, and an air supply pipe for supplying combustion air to the heat storage chamber And at least a pair of heat storage burners having an exhaust gas discharge pipe for discharging combustion exhaust gas from the heat storage chamber, and in one heat storage burner, the combustion air is led from the air supply pipe through the heat storage chamber to the burner part, The combustion operation is performed by injecting fuel gas from the fuel gas supply pipe in the burner section, while in the other regenerative burner, the combustion exhaust gas is guided to the heat storage chamber and the heat of the combustion exhaust gas is stored in the heat storage material so that the exhaust gas is exhausted. A combustion control method for a heat storage combustion heat treatment furnace that performs a heat storage operation to be discharged from a discharge pipe and alternately switches between the combustion operation and the heat storage operation in the pair of heat storage burners. When the combustion operation and the heat storage operation in the pair of heat storage burners are switched, in the heat storage burner during the combustion operation, the supply amount of the fuel gas in the fuel gas supply pipe and the supply of the combustion air in the air supply pipe In the heat storage burner during the heat storage operation, the amount of fuel gas supplied in the fuel gas supply pipe and the amount of combustion air supplied in the air supply pipe are increased from the stopped state while reducing the amount from the steady combustion state. In the above pair of regenerative burners, the supply amount of fuel gas supplied from the fuel gas supply pipe and the supply amount of combustion air supplied from the air supply pipe are made constant, and the heat storage type during the combustion operation In the burner, after stopping the supply of the fuel gas in the fuel gas supply pipe and the supply of the combustion air in the air supply pipe, the combustion exhaust gas from the exhaust gas discharge pipe On the other hand, after stopping the operation of discharging the combustion exhaust gas from the exhaust gas discharge pipe in the heat storage burner during the heat storage operation, the supply of the fuel gas in the fuel gas supply pipe and the supply of the combustion air in the air supply pipe I started it.

ここで、上記のように一対の蓄熱式バーナにおける燃焼動作と蓄熱動作とを切り替えるにあたり、燃焼動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給量と、空気供給管における燃焼用空気の供給量とを減少させる一方、蓄熱動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給量と、空気供給管における燃焼用空気の供給量とを増加させ、上記の一対の蓄熱式バーナにおいて、燃料ガス供給管から供給される燃料ガスの供給量と、空気供給管から供給される燃焼用空気の供給量とを一定化させると、燃焼動作と蓄熱動作との切り替え時においても、この一対の蓄熱式バーナにより蓄熱燃焼式熱処理炉に供給される燃料ガスの量と燃焼用空気の量及びその割合が一定化して、適切な燃焼が安定して行えるようになる。
また、一定量の燃料ガスを供給する燃料ガス供給装置から、上記の各蓄熱式バーナにおける燃料ガス供給管に燃料ガスを供給させると、上記のように燃焼動作と蓄熱動作との切り替えを行う一対の蓄熱式バーナにおいて、燃料ガス供給管から供給される燃料ガスの供給量と、空気供給管から供給される燃焼用空気の供給量とが一定化されるため、蓄熱燃焼式熱処理炉内に一定した量の燃料ガスと燃焼用空気とが供給されるようになる。
また、一対の蓄熱式バーナにおける燃焼動作と蓄熱動作とを切り替えるにあたり、燃焼動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給と、空気供給管における燃焼用空気の供給を停止させた後、排ガス排出管から燃焼排ガスを排出させる一方、蓄熱動作中の蓄熱式バーナにおいて、排ガス排出管から燃焼排ガスを排出させる操作を停止した後、燃料ガス供給管における燃料ガスの供給と、空気供給管における燃焼用空気の供給とを開始させるようにすると、燃焼動作と蓄熱動作とを切り替える際に、切替弁等による切り替え動作中に、空気供給管から蓄熱室に導かれる燃焼用空気の一部が、蓄熱室に行かずに排ガス排出管を通して排出されるのが確実に防止され、蓄熱燃焼式熱処理炉内に供給される燃料ガスと燃焼用空気との割合がより一定した状態になる。 Here, when switching between the combustion operation and the heat storage operation in the pair of heat storage type burners as described above, in the heat storage type burner during the combustion operation, the fuel gas supply amount in the fuel gas supply pipe and the combustion in the air supply pipe While reducing the supply amount of air, in the regenerative burner during the heat storage operation, the supply amount of fuel gas in the fuel gas supply pipe and the supply amount of combustion air in the air supply pipe are increased. In the regenerative burner, when the supply amount of the fuel gas supplied from the fuel gas supply pipe and the supply amount of the combustion air supplied from the air supply pipe are made constant, at the time of switching between the combustion operation and the heat storage operation However, with this pair of regenerative burners, the amount of fuel gas and the amount of combustion air supplied to the regenerative combustion heat treatment furnace and the ratio thereof are made constant so that proper combustion is stabilized. It obtains as to become.
Further, when the fuel gas is supplied from the fuel gas supply device that supplies a certain amount of fuel gas to the fuel gas supply pipe in each of the heat storage burners, the pair of switching between the combustion operation and the heat storage operation is performed as described above. In this regenerative burner, the supply amount of fuel gas supplied from the fuel gas supply pipe and the supply amount of combustion air supplied from the air supply pipe are made constant. The required amount of fuel gas and combustion air are supplied.
Further, when switching between the combustion operation and the heat storage operation in the pair of heat storage burners, the fuel gas supply in the fuel gas supply pipe and the combustion air supply in the air supply pipe are stopped in the heat storage burner during the combustion operation. After the combustion exhaust gas is discharged from the exhaust gas exhaust pipe, the operation of discharging the combustion exhaust gas from the exhaust gas exhaust pipe in the heat storage burner during the heat storage operation is stopped, and then the supply of the fuel gas in the fuel gas supply pipe and the air When the supply of combustion air in the supply pipe is started, when switching between the combustion operation and the heat storage operation, one of the combustion air guided from the air supply pipe to the heat storage chamber during the switching operation by the switching valve or the like. Is prevented from being discharged through the exhaust gas exhaust pipe without going to the heat storage chamber, and the fuel gas and combustion supplied into the heat storage combustion heat treatment furnace Ratio of the air becomes more constant state.

ここで、上記の蓄熱燃焼式熱処理炉としては、複数対の蓄熱式バーナを設け、各対の蓄熱式バーナにおいて、燃焼動作と蓄熱動作とを切り替えるタイミングを異ならせるようにしたものを用いることもできる。   Here, as the heat storage combustion type heat treatment furnace, a plurality of pairs of heat storage type burners may be provided, and in each pair of heat storage type burners, the timing for switching between the combustion operation and the heat storage operation may be different. it can.

また、上記のように蓄熱燃焼式熱処理炉に複数対の蓄熱式バーナを設け、各対の蓄熱式バーナにおいて、燃焼動作と蓄熱動作とを切り替えるタイミングを異ならせた場合においても、上記のように燃焼動作と蓄熱動作との切り替えを行う一対の蓄熱式バーナにおいて、一定した量の燃料ガスと燃焼用空気とが供給される結果、上記の燃料ガス供給装置から他の蓄熱式バーナ対における燃料ガス供給管に供給される燃料ガスの量が増加するということがなく、他の蓄熱式バーナ対においても、燃焼用空気に対する燃料ガスの比率が一定に保たれるようになる。   Also, as described above, even when multiple pairs of regenerative burners are provided in the regenerative combustion heat treatment furnace as described above and the timing for switching between the combustion operation and the heat storage operation is different in each pair of regenerative burners, as described above. In a pair of regenerative burners that switch between combustion operation and regenerative operation, a constant amount of fuel gas and combustion air are supplied, so that the fuel gas in the other regenerative burner pair is supplied from the fuel gas supply device. The amount of the fuel gas supplied to the supply pipe does not increase, and the ratio of the fuel gas to the combustion air is kept constant also in other heat storage burner pairs.

本発明における蓄熱燃焼式熱処理炉の燃焼制御方法においては、上記のように一対の蓄熱式バーナにおける燃焼動作と蓄熱動作とを切り替えるにあたり、燃焼動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給量と、空気供給管における燃焼用空気の供給量とを減少させる一方、蓄熱動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給量と、空気供給管における燃焼用空気の供給量とを増加させ、上記の一対の蓄熱式バーナ全体において、燃料ガス供給管から供給される燃料ガスの供給量と、空気供給管から供給される燃焼用空気の供給量とを一定化させるようにしたため、燃焼動作と蓄熱動作との切り替え時においても、蓄熱燃焼式熱処理炉内に一定した量の燃料ガスと燃焼用空気とが供給されるようになる。   In the combustion control method of the heat storage combustion heat treatment furnace according to the present invention, when switching between the combustion operation and the heat storage operation in the pair of heat storage burners as described above, in the heat storage burner during the combustion operation, the fuel in the fuel gas supply pipe While reducing the gas supply amount and the combustion air supply amount in the air supply pipe, in the heat storage burner during the heat storage operation, the fuel gas supply amount in the fuel gas supply pipe and the combustion air in the air supply pipe The amount of fuel gas supplied from the fuel gas supply pipe and the amount of combustion air supplied from the air supply pipe are made constant throughout the pair of regenerative burners. Therefore, even when switching between the combustion operation and the heat storage operation, a constant amount of fuel gas and combustion air are supplied into the heat storage combustion heat treatment furnace. So as to.

この結果、一対の蓄熱式バーナにおける燃焼動作と蓄熱動作とを切り替える際においても、蓄熱燃焼式熱処理炉において燃焼状態が変化するのが抑制され、適切な燃焼が安定して行えるようになる。   As a result, even when switching between the combustion operation and the heat storage operation in the pair of heat storage burners, the change of the combustion state in the heat storage combustion heat treatment furnace is suppressed, and appropriate combustion can be stably performed.

また、一定量の燃料ガスを供給する燃料ガス供給装置から各蓄熱式バーナにおける燃料ガス供給管に燃料ガスを供給させる場合においても、上記のように燃焼動作と蓄熱動作との切り替えを行う一対の蓄熱式バーナにおいて、一定した量の燃料ガスと燃焼用空気とが蓄熱燃焼式熱処理炉内に供給されるため、燃料ガス供給装置から各蓄熱式バーナに供給される燃料ガスの合計量が変動するということなく、適切な燃焼が安定して行えるようになる。   In addition, when fuel gas is supplied from a fuel gas supply device that supplies a certain amount of fuel gas to a fuel gas supply pipe in each regenerative burner, a pair of switching between combustion operation and heat storage operation as described above is performed. In the regenerative burner, since a constant amount of fuel gas and combustion air are supplied into the regenerative combustion heat treatment furnace, the total amount of fuel gas supplied from the fuel gas supply device to each regenerative burner varies. Rather, proper combustion can be performed stably.

また、蓄熱燃焼式熱処理炉に複数対の蓄熱式バーナを設け、各対の蓄熱式バーナにおいて、燃焼動作と蓄熱動作とを切り替えるタイミングを異ならせた場合においても、上記のように燃料ガス供給装置から他の蓄熱式バーナ対における燃料ガス供給管に供給される燃料ガスの量が増加するということがなく、他の蓄熱式バーナ対においても、燃焼用空気に対する燃料ガスの比率が一定に保たれて、適切な燃焼が安定して行えるようになる。このため、燃料ガス供給管から供給させる燃料ガスに燃焼性の悪いプロパンガス等を用いた場合にも、黒煙（煤）が発生するのが防止され、環境上問題が生じたり、被処理材に煤が付着したりするということがなくなる。   Further, even when a plurality of pairs of regenerative burners are provided in the regenerative combustion heat treatment furnace and the timing for switching between the combustion operation and the heat storage operation is different in each pair of regenerative burners, the fuel gas supply device as described above Therefore, the amount of fuel gas supplied to the fuel gas supply pipe in the other regenerative burner pair is not increased, and the ratio of the fuel gas to the combustion air is kept constant in the other regenerative burner pair. Thus, proper combustion can be stably performed. For this reason, even when propane gas or the like having poor flammability is used as the fuel gas supplied from the fuel gas supply pipe, black smoke (soot) is prevented from being generated, causing environmental problems, No wrinkles are attached to the surface.

本発明の一実施形態に係る蓄熱燃焼式熱処理炉の燃焼制御方法において、蓄熱燃焼式熱処理炉の内部状態を示した概略断面図である。In the combustion control method of the regenerative combustion type heat treatment furnace according to one embodiment of the present invention, it is a schematic sectional view showing the internal state of the regenerative combustion type heat treatment furnace. 同実施形態において、上記の蓄熱燃焼式熱処理炉の概略平面図である。In the same embodiment, it is a schematic plan view of said regenerative combustion heat treatment furnace. 同実施形態において、一対の蓄熱式バーナにおける一方の蓄熱式バーナで燃焼動作を行う一方、他方の蓄熱式バーナで蓄熱動作を行う状態を示した概略説明図である。In the embodiment, it is the schematic explanatory drawing which showed the state which performs a combustion operation | movement with one heat storage type burner in a pair of heat storage type burners, and performs a heat storage operation | movement with the other heat storage type burner. 同実施形態において、各対の蓄熱式バーナにおけるそれぞれの蓄熱式バーナにおいて燃焼動作と蓄熱動作とを切り替える動作を示したタイムチャートである。In the same embodiment, it is the time chart which showed the operation | movement which switches combustion operation | movement and heat storage operation | movement in each heat storage type burner in each pair of heat storage type burners.

以下、本発明の実施形態に係る蓄熱燃焼式熱処理炉の燃焼制御方法を添付図面に基づいて具体的に説明する。なお、本発明に係る蓄熱燃焼式熱処理炉の燃焼制御方法は、特に下記の実施形態に示したものに限定されず、発明の要旨を変更しない範囲において、適宜変更して実施できるものである。   Hereinafter, a combustion control method for a regenerative combustion heat treatment furnace according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. In addition, the combustion control method for the regenerative combustion heat treatment furnace according to the present invention is not particularly limited to the one shown in the following embodiment, and can be implemented with appropriate modifications within a range not changing the gist of the invention.

ここで、この実施形態においては、図１に示すように、蓄熱燃焼式熱処理炉１０の入口１１から蓄熱燃焼式熱処理炉１０内に導かれた鋼材からなる被処理材１を、ウォーキングビーム２により蓄熱燃焼式熱処理炉１０内において搬送させて熱処理し、このように熱処理された被処理材１を蓄熱燃焼式熱処理炉１０の出口１２を通して蓄熱燃焼式熱処理炉１０から取り出すようにしている。   Here, in this embodiment, as shown in FIG. 1, the workpiece 1 made of steel led from the inlet 11 of the regenerative combustion heat treatment furnace 10 into the regenerative combustion heat treatment furnace 10 is moved by the walking beam 2. The heat treatment material 10 is conveyed and heat-treated in the regenerative combustion heat treatment furnace 10, and the material 1 thus heat treated is taken out from the regenerative combustion heat treatment furnace 10 through the outlet 12 of the regenerative combustion heat treatment furnace 10.

そして、この実施形態においては、図２に示すように、上記の蓄熱燃焼式熱処理炉１０において、バーナ部２１と蓄熱室２２とを有する一対の蓄熱式バーナ２０が対向するようにして、上記の被処理材１の移動方向に沿って蓄熱燃焼式熱処理炉１０に４対の蓄熱式バーナ２０を設けると共に、一定量の燃料ガスを供給する燃料ガス供給装置３０から各蓄熱式バーナ２０におけるバーナ部２１に対して燃料ガスを供給するようにしている。   In this embodiment, as shown in FIG. 2, in the above-described heat storage combustion heat treatment furnace 10, the pair of heat storage burners 20 having the burner portion 21 and the heat storage chamber 22 are opposed to each other. 4 pairs of regenerative burners 20 are provided in the regenerative combustion heat treatment furnace 10 along the moving direction of the workpiece 1 and a burner section in each regenerative burner 20 from a fuel gas supply device 30 that supplies a certain amount of fuel gas. The fuel gas is supplied to 21.

ここで、上記の一対の蓄熱式バーナ２０においては、図３に示すように、一方の蓄熱式バーナ２０ａにおいて、蓄熱材２３ａが収容された蓄熱室２２ａに燃焼用空気を供給する空気供給管２４ａに設けられた空気供給用バルブ２５ａを開く一方、蓄熱室２２ａを通して燃焼排ガスを排出する排ガス排出管２６ａに設けられたガス排出用バルブ２７ａを閉じ、上記の空気供給管２４ａを通して蓄熱室２２ａ内に導いた燃焼用空気をこの蓄熱室２２ａ内に収容された蓄熱材２３ａによって加熱させる。   Here, in the pair of heat storage burners 20, as shown in FIG. 3, in one heat storage burner 20a, an air supply pipe 24a that supplies combustion air to the heat storage chamber 22a in which the heat storage material 23a is accommodated. Open the air supply valve 25a provided in the exhaust gas, close the gas discharge valve 27a provided in the exhaust gas discharge pipe 26a for discharging the combustion exhaust gas through the heat storage chamber 22a, and enter the heat storage chamber 22a through the air supply pipe 24a. The guided combustion air is heated by the heat storage material 23a accommodated in the heat storage chamber 22a.

そして、このように加熱された燃焼用空気をバーナ部２１ａに供給すると共に、このバーナ部２１ａの中心に設けられた燃料ガス供給管２８ａに燃料ガスを導くガス供給バルブ２９ａを開けて、上記の燃料ガス供給装置３０から供給された燃料ガスをこの燃料ガス供給管２８ａから噴射させて、この燃料ガスを蓄熱燃焼式熱処理炉１０内において燃焼させる燃焼動作を行うようにする。   Then, the combustion air heated in this way is supplied to the burner portion 21a, and the gas supply valve 29a for introducing the fuel gas to the fuel gas supply pipe 28a provided at the center of the burner portion 21a is opened, and the above-mentioned The fuel gas supplied from the fuel gas supply device 30 is injected from the fuel gas supply pipe 28a, and the combustion operation for burning the fuel gas in the regenerative combustion heat treatment furnace 10 is performed.

一方、他方の蓄熱式バーナ２０ｂにおいては、燃料ガス供給管２８ｂに燃料ガスを供給するガス供給バルブ２９ｂ及び空気供給管２４ｂに設けられた空気供給用バルブ２５ｂを閉じて燃焼を行わないようにする一方、蓄熱室２２ｂを通して燃焼排ガスを排出する排ガス排出管２６ｂに設けられたガス排出用バルブ２７ｂを開くようにする。   On the other hand, in the other regenerative burner 20b, the gas supply valve 29b for supplying the fuel gas to the fuel gas supply pipe 28b and the air supply valve 25b provided in the air supply pipe 24b are closed to prevent combustion. On the other hand, the gas discharge valve 27b provided in the exhaust gas discharge pipe 26b for discharging the combustion exhaust gas through the heat storage chamber 22b is opened.

そして、上記のように蓄熱燃焼式熱処理炉１０内において燃焼された後の燃焼排ガスを蓄熱室２２ｂに導き、この蓄熱室２２ｂに収容された蓄熱材２３ｂに燃焼排ガスの熱を蓄熱させ、その後、この燃焼排ガスを上記の排ガス排出管２６ｂを通して外部に排出させる蓄熱動作を行うようにする。   Then, the combustion exhaust gas after being burned in the heat storage combustion heat treatment furnace 10 as described above is led to the heat storage chamber 22b, and the heat storage material 23b accommodated in the heat storage chamber 22b is used to store the heat of the combustion exhaust gas, A heat storage operation for discharging the combustion exhaust gas to the outside through the exhaust gas exhaust pipe 26b is performed.

そして、上記の一対の蓄熱式バーナ２０ａ，２０ｂにおいて、上記のような燃焼動作と蓄熱動作とを交互に切り替えて行うようにする。   In the pair of heat storage burners 20a and 20b, the combustion operation and the heat storage operation as described above are alternately switched.

また、各対の蓄熱式バーナ２０においても、上記のようにそれぞれ一対の蓄熱式バーナ２０ａ，２０ｂにおいて、上記の燃焼動作と蓄熱動作とを交互に切り替えて行うようにすると共に、各対の蓄熱式バーナ２０において、燃焼動作と蓄熱動作とを切り替えるタイミングを異ならせるようにしている。   Also, in each pair of regenerative burners 20, as described above, in each pair of regenerative burners 20a and 20b, the combustion operation and the regenerative operation are alternately switched, and each pair of regenerative burners 20 In the type burner 20, the timing for switching between the combustion operation and the heat storage operation is made different.

次に、上記の各対の蓄熱式バーナ２０において、それぞれ一対の蓄熱式バーナ２０ａ，２０ｂにおける燃焼動作と蓄熱動作とを切り替える動作を、図４に示すタイムチャートに基づいて説明する。   Next, an operation of switching between the combustion operation and the heat storage operation in each of the pair of heat storage burners 20a and 20b in each pair of the heat storage burners 20 will be described based on the time chart shown in FIG.

ここで、燃焼動作と蓄熱動作とを切り替えるにあたり、燃焼動作を行っていた蓄熱式バーナ２０ａにおいては、開いた状態にある空気供給用バルブ２５ａとガス供給バルブ２９ａとを閉じる操作を開始して、空気供給管２４ａから蓄熱室２２ａを通してバーナ部２１ａに供給する燃焼用空気の量を徐々に減少させると共に、燃料ガス供給管２８ａから噴射させる燃料ガスの量を徐々に減少させる。   Here, in switching between the combustion operation and the heat storage operation, in the heat storage burner 20a that was performing the combustion operation, an operation of closing the air supply valve 25a and the gas supply valve 29a in an open state is started, The amount of combustion air supplied from the air supply pipe 24a to the burner portion 21a through the heat storage chamber 22a is gradually reduced, and the amount of fuel gas injected from the fuel gas supply pipe 28a is gradually reduced.

そして、空気供給用バルブ２５ａとガス供給バルブ２９ａとが閉じられ、燃焼用空気と燃料ガスとが供給されなくなって燃焼が停止した時点で、閉じられた状態にあるガス排出用バルブ２７ａを開け、蓄熱室２２ａに導かれた燃焼排ガスの熱をこの蓄熱室２２ａに収容された蓄熱材２３ａに蓄熱させた後、この燃焼排ガスを上記の排ガス排出管２６ａを通して外部に排出させるようにする。   Then, when the air supply valve 25a and the gas supply valve 29a are closed and the combustion air and the fuel gas are not supplied and the combustion is stopped, the closed gas discharge valve 27a is opened, After the heat of the combustion exhaust gas guided to the heat storage chamber 22a is stored in the heat storage material 23a accommodated in the heat storage chamber 22a, the combustion exhaust gas is discharged to the outside through the exhaust gas discharge pipe 26a.

一方、蓄熱動作を行っていた蓄熱式バーナ２０ｂにおいては、開いた状態にあるガス排出用バルブ２７ｂを閉じて、排ガス排出管２６ｂを通して燃焼排ガスを外部に排出させる動作を停止させた後、上記の蓄熱式バーナ２０ａにおける空気供給用バルブ２５ａとガス供給バルブ２９ａとを閉じる操作の開始させるのと同期させて、閉じた状態にある空気供給用バルブ２５ｂとガス供給バルブ２９ｂとを開ける操作を開始し、空気供給管２４ｂから蓄熱室２２ｂを通してバーナ部２１ｂに供給させる燃焼用空気の量を徐々に増加させると共に、燃料ガス供給管２８ｂから噴射させる燃料ガスの量を徐々に増加させて、燃焼を開始させるようにする。   On the other hand, in the regenerative burner 20b that has been performing the heat accumulating operation, the gas exhaust valve 27b in the opened state is closed and the operation of exhausting the combustion exhaust gas to the outside through the exhaust gas exhaust pipe 26b is stopped, and then the above-mentioned The operation of opening the air supply valve 25b and the gas supply valve 29b in the closed state is started in synchronization with the start of the operation of closing the air supply valve 25a and the gas supply valve 29a in the heat storage burner 20a. The combustion air supplied from the air supply pipe 24b to the burner portion 21b through the heat storage chamber 22b is gradually increased and the amount of fuel gas injected from the fuel gas supply pipe 28b is gradually increased to start combustion. I will let you.

ここで、上記の各空気供給用バルブ２５ａ，２５ｂや各ガス供給バルブ２９ａ，２９ｂの開閉動作には、通常、数秒間を要するので、その間は、燃焼動作を行っていた蓄熱式バーナ２０ａにおける燃焼用空気や燃料ガスの減少量と、蓄熱動作を行っていた蓄熱式バーナ２０ｂにおける燃焼用空気や燃料ガスの増加量を、常に等しくする制御が必要になる。そして、この実施例においては、図４に示すように、一方の空気供給用バルブ２５ａ及びガス供給バルブ２９ａを閉じる動作と、他方の空気供給用バルブ２５ｂ及びガス供給バルブ２９ｂを開ける動作とを同時に開始し、同じ時間をかけて動作させるようにしている。   Here, since the opening and closing operations of the air supply valves 25a and 25b and the gas supply valves 29a and 29b usually require several seconds, the combustion in the regenerative burner 20a during which the combustion operation was performed during that time. It is necessary to control to always make the amount of decrease in the combustion air and fuel gas equal to the amount of increase in the combustion air and fuel gas in the heat storage burner 20b that has been performing the heat storage operation. In this embodiment, as shown in FIG. 4, the operation of closing one air supply valve 25a and the gas supply valve 29a and the operation of opening the other air supply valve 25b and the gas supply valve 29b are performed simultaneously. Start and let it work over the same time.

ここで、この一対の蓄熱式バーナ２０ａ，２０ｂにおいては、上記のように各燃料ガス供給管２８ａ，２８ｂから供給される燃料ガス全体の供給量と、空気供給管２４ａ，２４ｂから供給される燃焼用空気全体の供給量とが変化しないようにし、一定した量の燃料ガスと燃焼用空気とが供給されるようにしている。   Here, in this pair of regenerative burners 20a and 20b, the supply amount of the entire fuel gas supplied from the fuel gas supply pipes 28a and 28b and the combustion supplied from the air supply pipes 24a and 24b as described above. The supply amount of the entire working air is not changed, and a constant amount of fuel gas and combustion air are supplied.

このようにすると、一対の蓄熱式バーナ２０ａ，２０ｂにおける燃焼動作と蓄熱動作との切り替え時においても、蓄熱燃焼式熱処理炉１０に供給される燃料ガスの量と燃焼用空気の量及びその割合が一定化し、適切な燃焼が安定して行えるようになる。   In this way, even when switching between the combustion operation and the heat storage operation in the pair of heat storage burners 20a and 20b, the amount of fuel gas supplied to the heat storage combustion heat treatment furnace 10, the amount of combustion air, and the ratio thereof are It stabilizes and proper combustion can be performed stably.

また、上記のように蓄熱燃焼式熱処理炉１０に複数対の蓄熱式バーナ２０を設け、一定量の燃料ガスを供給する燃料ガス供給装置３０から各対の蓄熱式バーナ２０における各燃料ガス供給管２８ａ，２８ｂに燃料ガスを供給させる場合において、上記のように一対の蓄熱式バーナ２０ａ，２０ｂにおける燃焼動作と蓄熱動作との切り替え時においても、この一対の蓄熱式バーナ２０ａ，２０ｂ全体において、燃料ガス供給管２８ａ，２８ｂから供給される燃料ガスの供給量が変化しないようにすると、上記の燃料ガス供給装置３０から他の蓄熱式バーナ２０における各燃料ガス供給管２８ａ，２８ｂに供給される燃料ガスの量が変化するということもなくなる。   Further, as described above, a plurality of pairs of regenerative burners 20 are provided in the regenerative combustion heat treatment furnace 10, and each fuel gas supply pipe in each pair of regenerative burners 20 from a fuel gas supply device 30 that supplies a certain amount of fuel gas. When supplying fuel gas to 28a and 28b, even when switching between the combustion operation and the heat storage operation in the pair of heat storage burners 20a and 20b as described above, the fuel in the entire pair of heat storage burners 20a and 20b If the supply amount of the fuel gas supplied from the gas supply pipes 28a and 28b is not changed, the fuel supplied from the fuel gas supply apparatus 30 to the fuel gas supply pipes 28a and 28b in the other regenerative burner 20 will be described. The amount of gas does not change.

このため、一対の蓄熱式バーナ２０ａ，２０ｂにおける燃焼動作と蓄熱動作との切り替え時に、他の蓄熱式バーナ２０において、燃焼用空気に対する燃料ガスの割合が増加して燃焼状態が変化するということがなく、燃料ガスに燃焼性の悪いプロパンガス等を使用した場合においても、従来のように、不完全燃焼による黒煙（煤）が発生して、環境上問題が生じたり、被処理材に煤が付着して熱処理が適切に行えなくなったりするということがなく、適切な燃焼が安定して行えるようになる。   For this reason, at the time of switching between the combustion operation and the heat storage operation in the pair of heat storage burners 20a and 20b, the ratio of the fuel gas to the combustion air increases in the other heat storage burners 20 and the combustion state changes. However, even when propane gas with poor flammability is used as fuel gas, black smoke (soot) is generated due to incomplete combustion as in the past, causing environmental problems and Therefore, proper combustion can be stably performed without causing the heat treatment to be appropriately performed.

また、燃焼動作を行っていた蓄熱式バーナ２０ａにおいて、上記のように空気供給用バルブ２５ａとガス供給バルブ２９ａとが閉じられ、燃焼用空気と燃料ガスとが供給されなくなって燃焼が停止した時点で、閉じられた状態にあるガス排出用バルブ２７ａを開けるようにすると、空気供給管２４ａから蓄熱室２２ａに導かれる燃焼用空気の一部が、蓄熱室２２ａに行かずにバイパスして排ガス排出管２６ａを通して排出されるのが防止されるようになる。   Further, in the regenerative burner 20a that was performing the combustion operation, when the air supply valve 25a and the gas supply valve 29a are closed as described above, the combustion air and the fuel gas are not supplied, and the combustion is stopped. When the gas discharge valve 27a in the closed state is opened, a part of the combustion air led from the air supply pipe 24a to the heat storage chamber 22a bypasses the heat storage chamber 22a and is exhausted. It is prevented from being discharged through the pipe 26a.

また、蓄熱動作を行っていた蓄熱式バーナ２０ｂにおいて、上記のように開いた状態にあるガス排出用バルブ２７ｂを閉じた後、閉じた状態にある空気供給用バルブ２５ｂとガス供給バルブ２９ｂとを開けるようにすると、空気供給管２４ｂから蓄熱室２２ｂに導かれる燃焼用空気の一部が、蓄熱室２２ｂに行かずにバイパスして排ガス排出管２６ｂを通して排出されるのが防止されるようになる。   Further, in the regenerative burner 20b that has been performing the heat storage operation, after the gas discharge valve 27b in the open state is closed as described above, the air supply valve 25b and the gas supply valve 29b in the closed state are closed. When opened, a part of the combustion air guided from the air supply pipe 24b to the heat storage chamber 22b is prevented from being bypassed and exhausted through the exhaust gas discharge pipe 26b without going to the heat storage chamber 22b. .

この結果、蓄熱燃焼式熱処理炉１０内に供給される燃焼用空気の割合が減少するのが防止され、蓄熱燃焼式熱処理炉１０内に供給される燃料ガスと燃焼用空気との割合がより一定した状態になって、より適切な燃焼が安定して行えるようになる。   As a result, the ratio of the combustion air supplied into the heat storage combustion heat treatment furnace 10 is prevented from decreasing, and the ratio of the fuel gas and the combustion air supplied into the heat storage combustion heat treatment furnace 10 is more constant. As a result, more appropriate combustion can be stably performed.

１ 被処理材
２ ウォーキングビーム
１０ 蓄熱燃焼式熱処理炉
１１ 入口
１２ 出口
２０，２０ａ，２０ｂ 蓄熱式バーナ
２１，２１ａ，２１ｂ バーナ部
２２，２２ａ，２２ｂ 蓄熱室
２３ａ，２３ｂ 蓄熱材
２４ａ，２４ｂ 空気供給管
２５ａ，２５ｂ 空気供給用バルブ
２６ａ，２６ｂ 排ガス排出管
２７ａ，２７ｂ ガス排出用バルブ
２８ａ，２８ｂ 燃料ガス供給管
２９ａ，２９ｂ ガス供給バルブ
３０ 燃料ガス供給装置 DESCRIPTION OF SYMBOLS 1 Material to be processed 2 Walking beam 10 Thermal storage combustion type heat treatment furnace 11 Inlet 12 Outlet 20, 20a, 20b Thermal storage burner 21, 21a, 21b Burner part 22, 22a, 22b Thermal storage chamber 23a, 23b Thermal storage material 24a, 24b Air supply pipe 25a, 25b Air supply valve 26a, 26b Exhaust gas discharge pipe 27a, 27b Gas discharge valve 28a, 28b Fuel gas supply pipe 29a, 29b Gas supply valve 30 Fuel gas supply device

Claims (4)

燃料ガス供給管を備えたバーナ部と、蓄熱材を収容させた蓄熱室と、蓄熱室に燃焼用空気を供給する空気供給管と、蓄熱室から燃焼排ガスを排出させる排ガス排出管とを有する少なくとも一対の蓄熱式バーナが設けられ、一方の蓄熱式バーナにおいて、空気供給管から蓄熱室を通して燃焼用空気をバーナ部に導くと共に、このバーナ部における燃料ガス供給管から燃料ガスを噴射させて燃焼動作を行う一方、他方の蓄熱式バーナにおいて、燃焼排ガスを上記の蓄熱室に導いて燃焼排ガスの熱を蓄熱材に蓄熱させて排ガス排出管から排出させる蓄熱動作を行い、この一対の蓄熱式バーナにおける上記の燃焼動作と蓄熱動作とを交互に切り替える蓄熱燃焼式熱処理炉の燃焼制御方法において、上記の一対の蓄熱式バーナにおける燃焼動作と蓄熱動作とを切り替えるにあたり、燃焼動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給量と、空気供給管における燃焼用空気の供給量とを定常燃焼状態から減少させる一方、蓄熱動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給量と、空気供給管における燃焼用空気の供給量とを停止状態から増加させ、上記の一対の蓄熱式バーナにおいて、燃料ガス供給管から供給される燃料ガスの供給量と、空気供給管から供給される燃焼用空気の供給量とを一定化させると共に、一定量の燃料ガスを供給する燃料ガス供給装置から、上記の各蓄熱式バーナにおける燃料ガス供給管に燃料ガスを供給させることを特徴とする蓄熱燃焼式熱処理炉の燃焼制御方法。 At least a burner section provided with a fuel gas supply pipe, a heat storage chamber containing a heat storage material, an air supply pipe for supplying combustion air to the heat storage chamber, and an exhaust gas discharge pipe for discharging combustion exhaust gas from the heat storage chamber A pair of regenerative burners is provided, and in one regenerative burner, combustion air is guided from the air supply pipe through the heat storage chamber to the burner section, and fuel gas is injected from the fuel gas supply pipe in the burner section to perform combustion operation On the other hand, in the other regenerative burner, the combustion exhaust gas is led to the heat storage chamber, the heat of the combustion exhaust gas is stored in the heat storage material and discharged from the exhaust gas discharge pipe, and the heat storage operation is performed. In the combustion control method of a regenerative combustion heat treatment furnace that alternately switches between the combustion operation and the heat storage operation, the combustion operation and the heat storage operation in the pair of regenerative burners described above In the regenerative burner during the combustion operation, the supply amount of the fuel gas in the fuel gas supply pipe and the supply amount of the combustion air in the air supply pipe are reduced from the steady combustion state while the heat storage operation is being performed. In the regenerative burner, the supply amount of the fuel gas in the fuel gas supply pipe and the supply amount of the combustion air in the air supply pipe are increased from the stopped state and supplied from the fuel gas supply pipe in the pair of regenerative burners. The fuel gas supply device and the combustion air supply amount supplied from the air supply pipe are made constant, and a fuel gas supply device for supplying a constant amount of fuel gas is used in each of the regenerative burners. A combustion control method for a regenerative combustion heat treatment furnace, characterized in that fuel gas is supplied to a fuel gas supply pipe . 燃料ガス供給管を備えたバーナ部と、蓄熱材を収容させた蓄熱室と、蓄熱室に燃焼用空気を供給する空気供給管と、蓄熱室から燃焼排ガスを排出させる排ガス排出管とを有する少なくとも一対の蓄熱式バーナが設けられ、一方の蓄熱式バーナにおいて、空気供給管から蓄熱室を通して燃焼用空気をバーナ部に導くと共に、このバーナ部における燃料ガス供給管から燃料ガスを噴射させて燃焼動作を行う一方、他方の蓄熱式バーナにおいて、燃焼排ガスを上記の蓄熱室に導いて燃焼排ガスの熱を蓄熱材に蓄熱させて排ガス排出管から排出させる蓄熱動作を行い、この一対の蓄熱式バーナにおける上記の燃焼動作と蓄熱動作とを交互に切り替える蓄熱燃焼式熱処理炉の燃焼制御方法において、上記の一対の蓄熱式バーナにおける燃焼動作と蓄熱動作とを切り替えるにあたり、燃焼動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給量と、空気供給管における燃焼用空気の供給量とを定常燃焼状態から減少させる一方、蓄熱動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給量と、空気供給管における燃焼用空気の供給量とを停止状態から増加させ、上記の一対の蓄熱式バーナにおいて、燃料ガス供給管から供給される燃料ガスの供給量と、空気供給管から供給される燃焼用空気の供給量とを一定化させると共に、燃焼動作中の蓄熱式バーナにおいて、燃料ガス供給管における燃料ガスの供給と、空気供給管における燃焼用空気の供給を停止させた後、排ガス排出管から燃焼排ガスを排出させる一方、蓄熱動作中の蓄熱式バーナにおいて、排ガス排出管から燃焼排ガスを排出させる操作を停止した後、燃料ガス供給管における燃料ガスの供給と、空気供給管における燃焼用空気の供給とを開始させることを特徴とする蓄熱燃焼式熱処理炉の燃焼制御方法。 At least a burner section provided with a fuel gas supply pipe, a heat storage chamber containing a heat storage material, an air supply pipe for supplying combustion air to the heat storage chamber, and an exhaust gas discharge pipe for discharging combustion exhaust gas from the heat storage chamber A pair of regenerative burners is provided, and in one regenerative burner, combustion air is guided from the air supply pipe through the heat storage chamber to the burner section, and fuel gas is injected from the fuel gas supply pipe in the burner section to perform combustion operation On the other hand, in the other heat storage type burner, the heat storage operation is performed in which the combustion exhaust gas is guided to the heat storage chamber and the heat of the combustion exhaust gas is stored in the heat storage material and discharged from the exhaust gas discharge pipe. In the combustion control method of a regenerative combustion heat treatment furnace that alternately switches between the combustion operation and the heat storage operation, the combustion operation and the heat storage operation in the pair of regenerative burners described above In the regenerative burner during the combustion operation, the supply amount of the fuel gas in the fuel gas supply pipe and the supply amount of the combustion air in the air supply pipe are reduced from the steady combustion state while the heat storage operation is being performed. In the regenerative burner, the supply amount of the fuel gas in the fuel gas supply pipe and the supply amount of the combustion air in the air supply pipe are increased from the stopped state and supplied from the fuel gas supply pipe in the pair of regenerative burners. The fuel gas supply amount and the combustion air supply amount supplied from the air supply pipe are made constant, and in the regenerative burner during the combustion operation, the fuel gas supply in the fuel gas supply pipe and the air After the supply of combustion air in the supply pipe is stopped, the combustion exhaust gas is discharged from the exhaust gas discharge pipe, while the exhaust gas is discharged from the heat storage burner during the heat storage operation. After stopping the operation for discharging the combustion exhaust gas from the exhaust pipe, and the supply of the fuel gas in the fuel gas supply pipe, the combustion of the regenerative-combustion heat treat furnace, characterized in that to start the supply of combustion air in the air supply pipe Control method. 請求項２に記載の蓄熱燃焼式熱処理炉の燃焼制御方法において、一定量の燃料ガスを供給する燃料ガス供給装置から、上記の各蓄熱式バーナにおける燃料ガス供給管に燃料ガスを供給させることを特徴とする蓄熱燃焼式熱処理炉の燃焼制御方法。 3. The combustion control method for a regenerative heat treatment furnace according to claim 2, wherein a fuel gas is supplied from a fuel gas supply device that supplies a constant amount of fuel gas to a fuel gas supply pipe in each of the regenerative burners. A combustion control method for a heat storage combustion heat treatment furnace. 請求項１〜請求項３の何れか１項に記載の蓄熱燃焼式熱処理炉の燃焼制御方法において、上記の蓄熱燃焼式熱処理炉に複数対の蓄熱式バーナが設けられ、各対の蓄熱式バーナにおいて、燃焼動作と蓄熱動作とを切り替えるタイミングが異なっていることを特徴とする蓄熱燃焼式熱処理炉の燃焼制御方法。 The combustion control method for a regenerative combustion heat treatment furnace according to any one of claims 1 to 3, wherein the regenerative combustion heat treatment furnace is provided with a plurality of pairs of regenerative burners, and each pair of regenerative burners. The combustion control method for a heat storage combustion heat treatment furnace is characterized in that the timing for switching between the combustion operation and the heat storage operation is different.
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