JP5752156B2 - Combustion control method for combustion apparatus - Google Patents

Combustion control method for combustion apparatus Download PDF

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JP5752156B2
JP5752156B2 JP2013014601A JP2013014601A JP5752156B2 JP 5752156 B2 JP5752156 B2 JP 5752156B2 JP 2013014601 A JP2013014601 A JP 2013014601A JP 2013014601 A JP2013014601 A JP 2013014601A JP 5752156 B2 JP5752156 B2 JP 5752156B2
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combustion
air
fuel
primary
guide pipe
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JP2014145533A (en
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祐作 河本
祐作 河本
北村　和也
和也 北村
智樹 片山
智樹 片山
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Chugai Ro Co Ltd
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Priority to CN201310119635.9A priority patent/CN103968379B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/02—Disposition of air supply not passing through burner
    • 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
    • F23D14/62—Mixing devices; Mixing tubes
    • 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
    • F23D14/84—Flame spreading or otherwise shaping
    • 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
    • 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
    • F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel 
    • F23L9/02—Passages or apertures for delivering secondary air for completing combustion of fuel  by discharging the air above the fire
    • 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)
  • Regulation And Control Of Combustion (AREA)
  • Gas Burners (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)

Description

本発明は、燃焼装置の燃焼制御方法に関するものである。特に、１次燃焼用空気を案内する１次空気案内管と、この１次空気案内管の内周側に設けられて燃料を案内する燃料案内管と、前記の１次空気案内管によって案内された１次燃焼用空気と燃料案内管に案内された燃料とを燃焼させる１次燃焼室と、この１次燃焼室と炉の内部とを連通する第１ノズル部と、蓄熱室において加熱された２次燃焼用空気を案内する２次空気案内管と、この２次空気案内管によって案内された２次燃焼用空気を前記の第１ノズル部の近傍において炉の内部に噴出させる第２ノズル部とを有する燃焼装置に用いた場合において、炉の内部の温度に対応させて燃焼状態を適切に制御し、低温域から高温域において安定した燃焼性能が得られるようにすると共に、高温域におけるＮＯｘの発生を抑制でき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 combustion control method for a combustion apparatus . In particular, a primary air guide pipe that guides the primary combustion air, a fuel guide pipe that is provided on the inner peripheral side of the primary air guide pipe and guides the fuel, and is guided by the primary air guide pipe. The primary combustion chamber for burning the primary combustion air and the fuel guided by the fuel guide tube, the first nozzle portion communicating with the primary combustion chamber and the interior of the furnace, and the heat storage chamber were heated. A secondary air guide pipe for guiding the secondary combustion air, and a second nozzle section for injecting the secondary combustion air guided by the secondary air guide pipe into the furnace in the vicinity of the first nozzle section When the combustion apparatus is used, the combustion state is appropriately controlled according to the temperature inside the furnace, so that stable combustion performance can be obtained from the low temperature range to the high temperature range, and NOx in the high temperature range. To the point that can suppress the occurrence of And it has a butterfly.

被処理材を加熱処理する加熱炉等の各種の工業炉においては、従来より様々な燃焼装置が使用されている。   In various industrial furnaces such as a heating furnace that heat-treats a material to be processed, various combustion apparatuses are conventionally used.

そして、近年においては、特許文献１，２等に示されるように、１次燃焼用空気を案内する１次空気案内管と、この１次空気案内管の内周側に設けられて燃料を案内する燃料案内管とを設け、１次空気案内管によって案内された１次燃焼用空気と燃料案内管に案内された燃料とを１次燃焼させるようにすると共に、炉の内部における燃焼排ガスの熱を蓄熱材に蓄熱させる蓄熱室を設け、この蓄熱材によって２次燃焼用空気を加熱させ、２次空気案内管を通して加熱された２次燃焼用空気を炉内に導き、この２次燃焼用空気と燃料とを炉の内部において２次燃焼させ、燃焼後における燃焼排ガスの熱を有効に利用して、効率のよい燃焼を行うようにしたものが提案されている。   In recent years, as shown in Patent Documents 1 and 2, etc., a primary air guide pipe for guiding the primary combustion air and a fuel provided by being provided on the inner peripheral side of the primary air guide pipe. And the primary combustion air guided by the primary air guide pipe and the fuel guided by the fuel guide pipe are subjected to primary combustion, and the heat of the combustion exhaust gas in the furnace A heat storage chamber is provided for storing heat in the heat storage material, the secondary combustion air is heated by the heat storage material, the secondary combustion air heated through the secondary air guide tube is guided into the furnace, and the secondary combustion air And fuel are subjected to secondary combustion inside the furnace, and the heat of the combustion exhaust gas after combustion is effectively used to perform efficient combustion.

ここで、特許文献１に示されるものにおいては、燃料案内管に１次火炎ノズルとメイン火炎ノズルとを設け、１次火炎ノズルから吐出される燃料と１次燃焼用空気とを混合させて、スパークプラグで点火することにより１次火炎を形成すると共に、メイン火炎ノズルから吐出される燃料と１次燃焼用空気とを混合させ、前記の１次火炎から火移りさせてメイン火炎を炉の内部に形成し、さらに蓄熱室において加熱された２次燃焼用空気を前記の２次空気案内管によって案内し、この２次燃焼用空気を炉の内部に形成された前記のメイン火炎に向けて噴出させてメイン拡散火炎を形成するようにしている。   Here, in what is shown in Patent Document 1, the fuel guide pipe is provided with a primary flame nozzle and a main flame nozzle, and the fuel discharged from the primary flame nozzle and the primary combustion air are mixed, A primary flame is formed by igniting with a spark plug, and the fuel discharged from the main flame nozzle and the primary combustion air are mixed and transferred from the primary flame to dispose the main flame inside the furnace. And the secondary combustion air heated in the heat storage chamber is guided by the secondary air guide tube, and the secondary combustion air is ejected toward the main flame formed in the furnace. The main diffusion flame is formed.

しかし、特許文献１に示されるものにおいて、前記のメイン火炎だけで炉の内部を速やかに均一に加熱させることは困難であり、また炉の内部の温度が十分に上昇されておらず、燃料が自然着火しない状態で、前記のように２次燃焼用空気をメイン火炎に向けて噴出させると、燃料が十分に燃焼されず、メイン拡散火炎が適切に形成されず、燃焼が不安定になると共に、その排ガス中に未燃焼の燃料成分が残る等の問題があった。   However, in the one shown in Patent Document 1, it is difficult to quickly and uniformly heat the inside of the furnace with only the main flame, and the temperature inside the furnace is not sufficiently raised, If the secondary combustion air is jetted toward the main flame as described above in a state where no spontaneous ignition occurs, the fuel is not sufficiently burned, the main diffusion flame is not properly formed, and the combustion becomes unstable. There are problems such as unburned fuel components remaining in the exhaust gas.

また、特許文献２に示されるものにおいては、主燃焼室となる炉の内部に開口する１次燃焼室を設け、この１次燃焼室に燃料を噴出する燃料ノズルと、燃料ノズルの周囲に１次空気を供給する１次空気供給路と、１次燃焼室の近傍から主燃焼室に加熱された２次空気を噴射させる２次空気供給路とを設け、主燃焼室の温度が低い時には、１次空気と２次空気の全体量に対する１次空気の割合を高くして、噴霧された燃料を１次空気で取り囲み、燃焼が不完全な燃料が炉壁に付着するのを防止し、特に１次燃焼室の内壁にカーボンが付着したりするのを防止する一方、主燃焼室の温度が高い時には、１次空気と２次空気の全体量に対する１次空気の割合を低くして、ＮＯｘの発生を低減させるようにしている。   Moreover, in what is shown by patent document 2, the primary combustion chamber opened inside the furnace used as a main combustion chamber is provided, the fuel nozzle which injects a fuel into this primary combustion chamber, and 1 around the fuel nozzle. A primary air supply path for supplying secondary air and a secondary air supply path for injecting heated secondary air from the vicinity of the primary combustion chamber to the main combustion chamber are provided, and when the temperature of the main combustion chamber is low, Increase the ratio of primary air to the total amount of primary air and secondary air to surround the sprayed fuel with the primary air and prevent incomplete combustion from adhering to the furnace wall, especially While preventing the carbon from adhering to the inner wall of the primary combustion chamber, when the temperature of the main combustion chamber is high, the ratio of primary air to the total amount of primary air and secondary air is reduced to reduce NOx. The occurrence of this is reduced.

しかし、特許文献２に示されるものにおいては、上記の１次燃焼室において、燃料ノズルから噴出される燃料の周囲に１次空気供給路により導かれた１次空気を供給して１次燃焼させるだけであるため、主燃焼室全体の温度を速やかに均一に上昇させることは困難であり、主燃焼室に温度むらが生じ、前記のように２次空気供給路を通して、１次燃焼室の近傍から主燃焼室に２次空気を噴射させて燃焼させる場合に、温度の低い部分では、前記の燃料が十分に燃焼されず、その排ガス中に燃焼されない燃料成分が残りやすくなり、燃焼が不安定になる等の問題があった。   However, in the one disclosed in Patent Document 2, primary combustion is performed by supplying primary air guided by a primary air supply path around the fuel ejected from the fuel nozzle in the primary combustion chamber. Therefore, it is difficult to quickly and uniformly raise the temperature of the entire main combustion chamber, resulting in uneven temperature in the main combustion chamber and through the secondary air supply path as described above, in the vicinity of the primary combustion chamber. When the secondary air is injected into the main combustion chamber from the main combustion chamber and burned, the fuel is not burned sufficiently in the low temperature part, and the fuel components that are not burned easily remain in the exhaust gas, and the combustion is unstable. There were problems such as becoming.

特開２００７−２４３３５号公報JP 2007-24335 A 特開２０１０−１２７５２５号公報JP 2010-127525 A

本発明は、燃焼装置における前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。   An object of the present invention is to solve the above-described problems in a combustion apparatus.

すなわち、本発明においては、１次燃焼用空気を案内する１次空気案内管と、この１次空気案内管の内周側に設けられて燃料を案内する燃料案内管と、前記の１次空気案内管によって案内された１次燃焼用空気と燃料案内管に案内された燃料とを燃焼させる１次燃焼室と、この１次燃焼室と炉の内部とを連通する第１ノズル部と、蓄熱室において加熱された２次燃焼用空気を案内する２次空気案内管と、この２次空気案内管によって案内された２次燃焼用空気を前記の第１ノズル部の近傍において炉の内部に噴出させる第２ノズル部とを有する燃焼装置に用いた場合において、炉の内部の温度に対応させて燃焼状態を適切に制御し、低温域から高温域において安定した燃焼性能が得られるようにすると共に、高温域におけるＮＯｘの発生を抑制でき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, a primary air guide pipe that guides primary combustion air, a fuel guide pipe that is provided on the inner peripheral side of the primary air guide pipe and guides fuel, and the primary air A primary combustion chamber for combusting the primary combustion air guided by the guide tube and the fuel guided by the fuel guide tube; a first nozzle portion communicating the primary combustion chamber and the interior of the furnace; A secondary air guide pipe for guiding the secondary combustion air heated in the chamber, and the secondary combustion air guided by the secondary air guide pipe is jetted into the furnace in the vicinity of the first nozzle portion. When used in a combustion apparatus having a second nozzle section, the combustion state is appropriately controlled in accordance with the temperature inside the furnace so that stable combustion performance can be obtained from a low temperature range to a high temperature range. Suppresses the generation of NOx at high temperatures It is an object thereof to allow.

本発明に係る燃焼装置の燃焼制御方法においては、上記のような課題を解決するため、１次燃焼用空気を案内する１次空気案内管と、この１次空気案内管の内周側に設けられて燃料を案内する燃料案内管と、前記の１次空気案内管によって案内された１次燃焼用空気と燃料案内管によって案内された燃料とを燃焼させる１次燃焼室と、この１次燃焼室と炉の内部とを連通する第１ノズル部と、蓄熱室において加熱された２次燃焼用空気を案内する２次空気案内管と、この２次空気案内管によって案内された２次燃焼用空気を前記の第１ノズル部の近傍において炉の内部に噴出させる第２ノズル部とを有する燃焼装置に、前記の１次空気案内管による１次燃焼用空気の案内を制御する１次空気制御手段と、前記の燃料案内管による燃料の案内を制御する燃料制御手段と、前記の２次空気案内管による２次燃焼用空気の案内を制御する２次空気制御手段とを設け、前記の第１ノズル部を１次燃焼室から炉の内部に向けて収縮させ、前記の１次燃焼室において１次燃焼用空気と燃料とを燃焼させた燃焼排ガスを、前記の第１ノズル部を通して高速で炉の内部に噴出させる燃焼装置を用い、
炉の内部の温度が低い第１温度領域において、前記の１次空気制御手段によって１次空気案内管を通して案内される１次燃焼用空気と、前記の燃料制御手段によって燃料案内管を通して案内される燃料とを、前記の１次燃焼室において燃焼させて、この燃焼排ガスを前記の第１ノズル部を通して高速で炉の内部に噴出させる第１燃焼状態と、
炉の内部の温度が前記の第１温度領域より高くなった第２温度領域において、前記の燃料制御手段によって燃料案内管を通して案内される燃料の量を前記の第１燃焼状態よりも増加させると共に、前記の２次空気制御手段によって前記の２次空気案内管を通して案内される前記の２次燃焼用空気を前記の第２ノズル部から炉の内部に噴出させ、１次空気案内管を通して案内される１次燃焼用空気と燃料案内管を通して案内される燃料とを１次燃焼室において燃焼させて、この燃焼排ガスを前記の第１ノズル部を通して高速で炉の内部に噴出させると共に、炉の内部において、前記の２次燃焼用空気と前記の燃焼排ガスに含まれる未燃焼の燃料とを燃焼させる第２燃焼状態と、
炉の内部の温度が前記の第２温度領域より高くなった第３温度領域において、前記の１次空気制御手段によって１次空気案内管による１次燃焼用空気の案内を停止させると共に、前記の２次空気制御手段によって前記の２次空気案内管を通して前記の第２ノズル部から炉の内部に噴出させる前記の２次燃焼用空気の量を増加させ、前記の燃料制御手段によって燃料案内管を通して案内される燃料の量を増加させた状態で、この燃料を１次燃焼室から前記の第１ノズル部を通して炉の内部に噴出させ、炉の内部において前記の２次燃焼用空気と燃料とを燃焼させる第３燃焼状態と、
に切り換えるようにした。 In the combustion control method for a combustion apparatus according to the present invention, in order to solve the above-described problems, a primary air guide pipe for guiding the primary combustion air and an inner peripheral side of the primary air guide pipe are provided. A fuel guide pipe for guiding the fuel, a primary combustion chamber for burning the primary combustion air guided by the primary air guide pipe and the fuel guided by the fuel guide pipe, and the primary combustion A first nozzle portion that communicates between the chamber and the interior of the furnace, a secondary air guide tube that guides the secondary combustion air heated in the heat storage chamber, and a secondary combustion guide that is guided by the secondary air guide tube a combustion device and a second nozzle portion for ejecting air into the furnace in the vicinity of the first nozzle portion of the primary air control for controlling the guidance of the primary combustion air by the primary air guide tube Means and fuel guide by the fuel guide tube And fuel control means for Gosuru interior of said set and a secondary air control means for controlling the guidance of the secondary combustion air by the secondary air guide tube only, the furnace a first nozzle portion of the from the primary combustion chamber Using a combustion apparatus that causes the combustion exhaust gas, which has been shrunk toward the first combustion chamber, and combusted primary combustion air and fuel in the primary combustion chamber to be jetted into the furnace at high speed through the first nozzle portion ,
In the first temperature region where the temperature inside the furnace is low, the primary combustion air guided through the primary air guide pipe by the primary air control means and the fuel guide pipe through the fuel guide pipe are guided by the fuel control means. A first combustion state in which fuel is combusted in the primary combustion chamber and the combustion exhaust gas is ejected into the furnace at high speed through the first nozzle portion;
In the second temperature range in which the temperature inside the furnace is higher than the first temperature range, the amount of fuel guided through the fuel guide pipe by the fuel control means is increased from the first combustion state. The secondary combustion air guided through the secondary air guide pipe by the secondary air control means is ejected from the second nozzle portion into the furnace and guided through the primary air guide pipe. The primary combustion air and the fuel guided through the fuel guide pipe are combusted in the primary combustion chamber, and the combustion exhaust gas is ejected into the furnace at a high speed through the first nozzle portion. A second combustion state in which the secondary combustion air and unburned fuel contained in the combustion exhaust gas are burned,
In the third temperature range in which the temperature inside the furnace is higher than the second temperature range, the primary air control means stops guiding the primary combustion air by the primary air guide pipe, and The amount of the secondary combustion air jetted from the second nozzle portion into the furnace through the secondary air guide pipe by the secondary air control means is increased, and the fuel control means passes the fuel guide pipe through the fuel guide pipe. In a state where the amount of fuel to be guided is increased, this fuel is ejected from the primary combustion chamber through the first nozzle portion into the furnace, and the secondary combustion air and fuel are discharged inside the furnace. A third combustion state for burning;
I switched to.

また、本発明に係る燃焼装置の燃焼制御方法においては、前記の燃料案内管によって案内された燃料が前記の１次燃焼室に導かれる前に、前記の燃料に予備燃焼用空気を混合させる予備空気供給手段を設けると共に、この予備空気供給手段による予備燃焼用空気の供給を制御する予備空気制御手段を設けることができる。 Further, in the combustion control method of the combustion apparatus according to the present invention, the preliminary combustion air is mixed with the fuel before the fuel guided by the fuel guide pipe is guided to the primary combustion chamber. In addition to providing air supply means, it is possible to provide preliminary air control means for controlling the supply of preliminary combustion air by the preliminary air supply means.

ここで、予備空気供給手段においては、予備燃焼用空気を前記の燃料案内管に供給して、燃料と予備燃焼用空気とを予備混合（予混合とも称される）させるようにし、或いは、前記の燃料案内管と１次空気案内管との間に予備空気案内管を設け、この予備空気案内管によって案内された予備燃焼用空気を、１次燃焼室に導かれる前に燃料案内管によって案内された燃料と予備混合させるようにすることができる。   Here, in the preliminary air supply means, preliminary combustion air is supplied to the fuel guide pipe so that the fuel and preliminary combustion air are premixed (also referred to as premixing), or A preliminary air guide pipe is provided between the fuel guide pipe and the primary air guide pipe, and the preliminary combustion air guided by the preliminary air guide pipe is guided by the fuel guide pipe before being guided to the primary combustion chamber. And premixed with the spent fuel.

また、前記の燃料案内管によって案内された燃料が前記の１次燃焼室に導かれる前に、前記の燃料に予備燃焼用空気を混合させる予備空気供給手段を設けると共に、この予備空気供給手段による予備燃焼用空気の供給を制御する予備空気制御手段を設けた燃焼装置の燃焼制御方法においては、前記の第１燃焼状態の前に、前記の燃料制御手段によって燃料案内管を通して案内される燃料の量を少なくすると共に、前記の予備空気供給手段により、予備燃焼用空気を１次燃焼室に導かれる前の燃料に予備燃焼用空気を混合させて予備燃焼させるようにすることができる。   In addition, before the fuel guided by the fuel guide pipe is guided to the primary combustion chamber, there is provided a preliminary air supply means for mixing the fuel for preliminary combustion with the preliminary air supply means. In the combustion control method of the combustion apparatus provided with the preliminary air control means for controlling the supply of the preliminary combustion air, the fuel guided through the fuel guide pipe by the fuel control means before the first combustion state. In addition to reducing the amount, the preliminary air supply means can perform preliminary combustion by mixing the preliminary combustion air with the fuel before the preliminary combustion air is introduced into the primary combustion chamber.

また、前記の第１燃焼状態を経ずに、前記の第２燃焼状態と第３燃焼状態とに切り換えるようにすることもできる。   It is also possible to switch between the second combustion state and the third combustion state without passing through the first combustion state.

本発明における燃焼装置の燃焼制御方法においては、炉の内部の温度が低い第１温度領域において、前記の１次空気制御手段によって１次空気案内管を通して案内される１次燃焼用空気と、前記の燃料制御手段によって燃料案内管を通して案内される燃料とを、前記の１次燃焼室において燃焼させて、この燃焼排ガスを前記の第１ノズル部を通して高速で炉の内部に噴出させる第１燃焼状態にすると、第１ノズル部を通して高速で炉の内部に噴出された高温の燃焼排ガスによる攪拌効果により、炉の内部全体が速やかに均一に加熱されるようになる。 In the combustion control method for a combustion apparatus according to the present invention, the primary combustion air guided through the primary air guide pipe by the primary air control means in the first temperature region where the temperature inside the furnace is low, The first combustion state in which the fuel guided through the fuel guide pipe by the fuel control means is burned in the primary combustion chamber and the combustion exhaust gas is jetted into the furnace at high speed through the first nozzle portion. Then, the entire interior of the furnace is quickly and uniformly heated by the stirring effect of the high-temperature combustion exhaust gas ejected into the furnace at high speed through the first nozzle portion.

そして、炉の内部の温度が前記の第１温度領域より高くなった第２温度領域において、前記の燃料制御手段によって燃料案内管を通して案内される燃料の量を前記の第１燃焼状態よりも増加させると共に、前記の２次空気制御手段によって前記の２次空気案内管を通して案内される前記の２次燃焼用空気を前記の第２ノズル部から炉の内部に噴出させ、１次空気案内管を通して案内される１次燃焼用空気と燃料案内管を通して案内される燃料とを１次燃焼室において燃焼させて、この燃焼排ガスを前記の第１ノズル部を通して高速で炉の内部に噴出させると共に、炉の内部において、前記の２次燃焼用空気と前記の燃焼排ガスに含まれる未燃焼の燃料とを燃焼させる第２燃焼状態にすると、炉の内部の雰囲気が攪拌されて未燃焼の燃料が残るということがなく、燃焼量を増加させると共に燃焼効率を高めることができる。   Then, in the second temperature range in which the temperature inside the furnace is higher than the first temperature range, the amount of fuel guided through the fuel guide pipe by the fuel control means is increased from that in the first combustion state. And the secondary combustion air guided through the secondary air guide pipe by the secondary air control means is jetted into the furnace from the second nozzle portion, and is passed through the primary air guide pipe. The primary combustion air to be guided and the fuel guided through the fuel guide pipe are combusted in the primary combustion chamber, and the combustion exhaust gas is jetted into the furnace at a high speed through the first nozzle portion. In the second combustion state in which the secondary combustion air and the unburned fuel contained in the combustion exhaust gas are burned, the atmosphere inside the furnace is stirred and the unburned fuel remains. Without say, it is possible to increase the combustion efficiency with increasing combustion amount.

また、熱交換器や蓄熱材が収容された蓄熱室を通して２次燃焼用空気を加熱させる燃焼装置を用いた場合には、熱回収の効率も高まり、省エネルギー効果も向上する。   Moreover, when the combustion apparatus which heats the air for secondary combustion through the heat storage chamber in which the heat exchanger or the heat storage material is accommodated is used, the efficiency of heat recovery is increased and the energy saving effect is improved.

さらに、炉の内部の温度が前記の第２温度領域より高くなった第３温度領域において、前記の１次空気制御手段によって１次空気案内管による１次燃焼用空気の案内を停止させると共に、前記の２次空気制御手段によって前記の２次空気案内管を通して前記の第２ノズル部から炉の内部に噴出させる前記の２次燃焼用空気の量を増加させ、前記の燃料制御手段によって燃料案内管を通して案内される燃料の量を増加させた状態で、この燃料を１次燃焼室から前記の第１ノズル部を通して炉の内部に噴出させ、炉の内部において前記の２次燃焼用空気と燃料とを燃焼させる第３燃焼状態にすると、炉の内部に噴出された燃料と加熱された２次燃焼用空気とが、前記のように均一に加熱された炉の内部において適切に混合されて、広い範囲で燃焼されるようになり、燃焼効率が高められると共に、局部的な燃焼によって温度が局部的に上昇するのが抑制され、ＮＯｘが発生するのも適切に抑制されるようになる。   Furthermore, in the third temperature region where the temperature inside the furnace is higher than the second temperature region, the primary air control means stops the primary combustion air guide by the primary air guide pipe, and The secondary air control means increases the amount of the secondary combustion air that is jetted from the second nozzle portion into the furnace through the secondary air guide pipe, and the fuel control means guides the fuel. In a state where the amount of fuel guided through the pipe is increased, this fuel is ejected from the primary combustion chamber through the first nozzle portion into the furnace, and the secondary combustion air and fuel are injected into the furnace. In the third combustion state, the fuel injected into the furnace and the heated secondary combustion air are appropriately mixed inside the furnace heated uniformly as described above, Burning in a wide range Came to be, the combustion efficiency is increased, the temperature by local combustion is suppressed to locally rise, so also appropriately suppress the NOx is generated.

この結果、本発明における燃焼装置の燃焼制御方法においては、炉の内部の温度に対応させて燃焼状態を適切に制御し、低温域から高温域において安定した燃焼性能が得られると共に、高温域におけるＮＯｘの発生も適切に抑制できるようになる。 As a result, in the combustion control method of the combustion apparatus according to the present invention, the combustion state is appropriately controlled according to the temperature inside the furnace, and stable combustion performance can be obtained from the low temperature range to the high temperature range, and in the high temperature range. Generation of NOx can be appropriately suppressed.

本発明の実施形態１に係る燃焼装置を示した概略説明図である。It is the schematic explanatory drawing which showed the combustion apparatus which concerns on Embodiment 1 of this invention. 前記の実施形態１に係る燃焼装置を使用し、炉の内部の温度が低い第１温度領域である場合に、第１燃焼状態にして燃焼させる状態を示した概略説明図である。It is the schematic explanatory drawing which showed the state made to burn in a 1st combustion state, when the combustion apparatus which concerns on the said Embodiment 1 is used and it is the 1st temperature range where the temperature inside a furnace is low. 前記の実施形態１に係る燃焼装置を使用し、炉の内部の温度が前記の第１温度領域より高くなった第２温度領域である場合に、第２燃焼状態にして燃焼させる状態を示した概略説明図である。When the combustion apparatus according to the first embodiment is used and the temperature inside the furnace is the second temperature range higher than the first temperature range, the combustion state in the second combustion state is shown. It is a schematic explanatory drawing. 前記の実施形態１に係る燃焼装置を使用し、炉の内部の温度が前記の第２温度領域より高くなった第３温度領域である場合に、第３燃焼状態にして燃焼させる状態を示した概略説明図である。When the combustion apparatus according to the first embodiment is used and the temperature inside the furnace is the third temperature range higher than the second temperature range, the combustion state is shown in the third combustion state. It is a schematic explanatory drawing. 本発明の実施形態２に係る燃焼装置を示し、第１燃焼状態による燃焼を行う前に、燃料と予備燃焼用空気とを混合させて予備燃焼させるようにした燃焼装置の概略説明図である。It is a schematic explanatory drawing of the combustion apparatus which shows the combustion apparatus which concerns on Embodiment 2 of this invention, and was made to pre-combust by mixing a fuel and the air for precombustion before performing combustion by a 1st combustion state. 前記の実施形態２に係る燃焼装置を使用し、炉の内部の温度が低い第１温度領域において、第１燃焼状態による燃焼を行う前に、燃料と予備燃焼用空気とを混合させて予備燃焼させる状態を示した概略説明図である。In the first temperature region where the temperature inside the furnace is low using the combustion apparatus according to the second embodiment, the fuel and the precombustion air are mixed and precombusted before the combustion in the first combustion state is performed. It is the schematic explanatory drawing which showed the state made to do. 前記の実施形態２に係る燃焼装置を使用し、炉の内部の温度が低い第１温度領域である場合に、第１燃焼状態にして燃焼させる状態を示した概略説明図である。It is the schematic explanatory drawing which showed the state made to burn in a 1st combustion state, when the combustion apparatus which concerns on the said Embodiment 2 is used and it is the 1st temperature range where the temperature inside a furnace is low. 前記の実施形態２に係る燃焼装置を使用し、炉の内部の温度が前記の第１温度領域より高くなった第２温度領域である場合に、第２燃焼状態にして燃焼させる状態を示した概略説明図である。When the combustion apparatus according to the second embodiment is used and the temperature inside the furnace is the second temperature range higher than the first temperature range, the combustion state in the second combustion state is shown. It is a schematic explanatory drawing. 前記の実施形態２に係る燃焼装置を使用し、炉の内部の温度が前記の第２温度領域より高くなった第３温度領域である場合に、第３燃焼状態にして燃焼させる状態を示した概略説明図である。When the combustion apparatus according to the second embodiment is used and the temperature inside the furnace is the third temperature range higher than the second temperature range, the combustion state is shown in the third combustion state. It is a schematic explanatory drawing. 本発明の実施形態３に係る燃焼装置を示し、第１燃焼状態による燃焼を行う前に、燃料と予備燃焼用空気とを混合させて予備燃焼させるようにした燃焼装置の概略説明図である。It is a schematic explanatory drawing of the combustion apparatus which showed the combustion apparatus which concerns on Embodiment 3 of this invention, and mixed the fuel and the air for preliminary | backup combustion before performing combustion by the 1st combustion state. 前記の実施形態３に係る燃焼装置を使用し、炉の内部の温度が低い第１温度領域において、第１燃焼状態による燃焼を行う前に、燃料と予備燃焼用空気とを混合させて予備燃焼させる状態を示した概略説明図である。In the first temperature region where the temperature inside the furnace is low using the combustion apparatus according to the third embodiment, the fuel and the precombustion air are mixed and precombusted before the combustion in the first combustion state is performed. It is the schematic explanatory drawing which showed the state made to do. 前記の実施形態３に係る燃焼装置を使用し、炉の内部の温度が低い第１温度領域である場合に、第１燃焼状態にして燃焼させる状態を示した概略説明図である。It is the schematic explanatory drawing which showed the state made to burn in a 1st combustion state, when the combustion apparatus which concerns on the said Embodiment 3 is used and it is a 1st temperature area | region where the temperature inside a furnace is low. 前記の実施形態３に係る燃焼装置を使用し、炉の内部の温度が前記の第１温度領域より高くなった第２温度領域である場合に、第２燃焼状態にして燃焼させる状態を示した概略説明図である。When the combustion apparatus according to the third embodiment is used and the temperature inside the furnace is the second temperature range higher than the first temperature range, the combustion state is shown in the second combustion state. It is a schematic explanatory drawing. 前記の実施形態３に係る燃焼装置を使用し、炉の内部の温度が前記の第２温度領域より高くなった第３温度領域である場合に、第３燃焼状態にして燃焼させる状態を示した概略説明図である。When the combustion apparatus according to the third embodiment is used and the temperature inside the furnace is the third temperature range higher than the second temperature range, the combustion state is shown in the third combustion state. It is a schematic explanatory drawing.

以下、本発明の実施形態に係る燃焼装置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、本発明に係る燃焼装置の燃焼制御方法は、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 combustion apparatus according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. In addition, the combustion control method of the combustion apparatus according to the present invention is not 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.

（実施形態１）
実施形態１の燃焼装置Ａ１においては、図１に示すように、１次燃焼用空気を案内する１次空気案内管１１の内周側に、燃料を案内する燃料案内管１２を設けると共に、前記の１次空気案内管１１と燃料案内管１２との先端側に、１次空気案内管１１によって案内された１次燃焼用空気と燃料案内管１２によって案内された燃料とを燃焼させる１次燃焼室１３を設け、また１次燃焼用空気が１次燃焼室１３に導かれる前の位置に、前記の１次空気案内管１１と燃料案内管１２との間にスタビライザ１４を設けると共に、前記の１次空気案内管１１内を通して前記の１次燃焼室１３に伸びたスパークプラグ１５を設けている。 (Embodiment 1)
In the combustion apparatus A1 of the first embodiment, as shown in FIG. 1, the fuel guide pipe 12 for guiding the fuel is provided on the inner peripheral side of the primary air guide pipe 11 for guiding the primary combustion air. The primary combustion in which the primary combustion air guided by the primary air guide tube 11 and the fuel guided by the fuel guide tube 12 are combusted at the distal end sides of the primary air guide tube 11 and the fuel guide tube 12. The chamber 13 is provided, and the stabilizer 14 is provided between the primary air guide pipe 11 and the fuel guide pipe 12 at a position before the primary combustion air is guided to the primary combustion chamber 13. A spark plug 15 extending into the primary combustion chamber 13 through the primary air guide tube 11 is provided.

そして、前記の１次燃焼室１３を第１ノズル部１６によって炉１の内部１ａに連通させるようにし、この第１ノズル部１６を前記の１次燃焼室１３から炉１の内部１ａに向けて収縮させている。   The primary combustion chamber 13 is communicated with the interior 1a of the furnace 1 by the first nozzle portion 16, and the first nozzle portion 16 is directed from the primary combustion chamber 13 toward the interior 1a of the furnace 1. Shrink.

また、前記の１次空気案内管１１の両側に、蓄熱材２１（２１Ａ，２１Ｂ）が収容された蓄熱室２０（２０Ａ，２０Ｂ）を対にして設け、各蓄熱室２０（２０Ａ，２０Ｂ）において加熱された２次燃焼用空気を案内する２次空気案内管２２（２２Ａ，２２Ｂ）を設けると共に、それぞれの２次空気案内管２２（２２Ａ，２２Ｂ）によって案内された前記の２次燃焼用空気を炉１の内部１ａに噴出させる第２ノズル部２３（２３Ａ，２３Ｂ）を、前記の第１ノズル部１６の近傍に設けている。   Further, a pair of heat storage chambers 20 (20A, 20B) in which heat storage materials 21 (21A, 21B) are accommodated are provided on both sides of the primary air guide tube 11, and in each heat storage chamber 20 (20A, 20B). Secondary air guide pipes 22 (22A, 22B) for guiding the heated secondary combustion air are provided, and the secondary combustion air guided by the respective secondary air guide pipes 22 (22A, 22B). The second nozzle part 23 (23A, 23B) for ejecting the gas to the inside 1a of the furnace 1 is provided in the vicinity of the first nozzle part 16.

そして、燃料供給装置３０から燃料を前記の燃料案内管１２に導く途中に燃料調整弁（燃料制御手段）３１を設け、この燃料調整弁３１によって燃料案内管１２に導く燃料の量を調整するようにしている。   A fuel adjustment valve (fuel control means) 31 is provided in the middle of introducing fuel from the fuel supply device 30 to the fuel guide pipe 12, and the amount of fuel guided to the fuel guide pipe 12 is adjusted by the fuel adjustment valve 31. I have to.

また、燃焼用空気供給装置４０から前記の１次空気案内管１１に燃焼用空気を導く途中に１次空気調整弁（１次空気制御手段）４１を設け、この１次燃焼用空気調整弁４１によって１次空気案内管１１に導く１次燃焼用空気の量を調整するようにしている。   Further, a primary air adjustment valve (primary air control means) 41 is provided in the middle of guiding combustion air from the combustion air supply device 40 to the primary air guide pipe 11, and this primary combustion air adjustment valve 41. Thus, the amount of primary combustion air guided to the primary air guide tube 11 is adjusted.

また、前記の燃焼用空気供給装置４０から燃焼用空気を各蓄熱室２０（２０Ａ，２０Ｂ）に導く途中に、それぞれ２次空気調整弁（２次空気制御手段）４２（４２Ａ，４２Ｂ）を設け、各２次空気調整弁４２（４２Ａ，４２Ｂ）によって各蓄熱室２０（２０Ａ，２０Ｂ）を通して前記の各２次空気案内管２２（２２Ａ，２２Ｂ）に導く２次燃焼用空気の量を調整するようにしている。   Further, secondary air regulating valves (secondary air control means) 42 (42A, 42B) are provided in the middle of introducing the combustion air from the combustion air supply device 40 to the respective heat storage chambers 20 (20A, 20B). The amount of secondary combustion air guided to each secondary air guide pipe 22 (22A, 22B) through each heat storage chamber 20 (20A, 20B) is adjusted by each secondary air adjustment valve 42 (42A, 42B). I am doing so.

また、前記の各蓄熱室２０（２０Ａ，２０Ｂ）において、炉１の内部１ａにおける燃焼排ガスの熱を前記の蓄熱材２１に蓄熱させた後、この燃焼排ガスを蓄熱室２０（２０Ａ，２０Ｂ）から排出させる排ガス排出管２４（２４Ａ，２４Ｂ）を設けると共に、各排ガス排出管２４（２４Ａ，２４Ｂ）と排気装置５０との間にそれぞれ排ガス排出弁５１（５１Ａ，５１Ｂ）を設け、この排ガス排出弁５１（５１Ａ，５１Ｂ）を開けて、各蓄熱室２０（２０Ａ，２０Ｂ）から各排ガス排出管２４（２４Ａ，２４Ｂ）に導かれた燃焼排ガスを排気装置５０によって排気させるようにしている。   Further, in each of the heat storage chambers 20 (20A, 20B), the heat of the combustion exhaust gas in the interior 1a of the furnace 1 is stored in the heat storage material 21, and then the combustion exhaust gas is transferred from the heat storage chamber 20 (20A, 20B). Exhaust gas discharge pipes 24 (24A, 24B) to be discharged are provided, and exhaust gas discharge valves 51 (51A, 51B) are provided between the exhaust gas discharge pipes 24 (24A, 24B) and the exhaust device 50, respectively. 51 (51A, 51B) is opened, and the exhaust gas 50 exhausts the combustion exhaust gas guided from each heat storage chamber 20 (20A, 20B) to each exhaust gas discharge pipe 24 (24A, 24B).

ここで、この実施形態１の燃焼装置Ａ１において、炉１の内部１ａの温度が低い第１温度領域においては、図２に示すように、前記の１次空気調整弁４１により、前記の燃焼用空気供給装置４０から適当量の１次燃焼用空気を１次空気案内管１１に導くと共に、前記の燃料調整弁３１により、燃料供給装置３０から適当量の燃料を燃料案内管１２に導き、前記の１次空気案内管１１を通して前記の１次燃焼室１３に導かれた１次燃焼用空気と、前記の燃料案内管１２を通して前記の１次燃焼室１３に導かれた燃料とを、この１次燃焼室１３において混合させると共に前記のスパークプラグ１５により着火させて燃焼させ、燃焼により発生した燃焼排ガスを、前記の第１ノズル部１６を通して前記の１次燃焼室１３から炉１の内部１ａに向けて噴出させるようにする（第１燃焼状態）。なお、図２〜図４における各弁３１，４１，４２，５１の開閉については、開いた状態を白抜きで、閉じた状態を黒塗りで示した。   Here, in the combustion apparatus A1 of the first embodiment, in the first temperature region where the temperature of the inside 1a of the furnace 1 is low, as shown in FIG. An appropriate amount of primary combustion air is guided from the air supply device 40 to the primary air guide tube 11, and an appropriate amount of fuel is guided from the fuel supply device 30 to the fuel guide tube 12 by the fuel adjustment valve 31. The primary combustion air guided to the primary combustion chamber 13 through the primary air guide tube 11 and the fuel guided to the primary combustion chamber 13 through the fuel guide tube 12 are The mixture is mixed in the secondary combustion chamber 13 and ignited and burned by the spark plug 15, and the combustion exhaust gas generated by the combustion is passed from the primary combustion chamber 13 to the inside 1 a of the furnace 1 through the first nozzle portion 16. Towards Issued to as the (first combustion state). In addition, about the opening and closing of each valve 31,41,42,51 in FIGS. 2-4, the open state was shown in white and the closed state was shown in black.

そして、このような第１燃焼状態による燃焼を行うと、１次燃焼室１３において燃焼されて膨張した高温の燃焼排ガスが、前記のように炉１の内部１ａに向けて収縮した第１ノズル部１６を通して高速で炉１の内部１ａに噴出されるようになり、高速で噴出された高温の燃焼排ガスによる攪拌効果により、炉１の内部１ａ全体が速やかに均一に加熱されるようになる。なお、「高速」とは、一般に８０ｍ／ｓ以上を意味し、このような状態で噴出すると、炉１の内部の雰囲気が攪拌され、炉１内の温度分布が均一になる。   When combustion is performed in such a first combustion state, the high-temperature combustion exhaust gas that has been combusted and expanded in the primary combustion chamber 13 contracted toward the interior 1a of the furnace 1 as described above. 16, the entire inside 1a of the furnace 1 is quickly and uniformly heated by the stirring effect of the high-temperature combustion exhaust gas ejected at a high speed. Note that “high speed” generally means 80 m / s or more. When jetting in such a state, the atmosphere inside the furnace 1 is agitated and the temperature distribution in the furnace 1 becomes uniform.

なお、この第１燃焼状態においては、前記の各２次空気調整弁４２Ａ，４２Ｂを閉じて、２次燃焼用空気が各蓄熱室２０Ａ，２０Ｂに供給されないようにし、各２次空気案内管２２Ａ，２２Ｂから２次燃焼用空気が炉１の内部１ａに噴出されないようにすると共に、前記の各排ガス排出弁５１Ａ，５１Ｂを閉じ、前記の排気装置５０によって炉１の内部１ａにおける燃焼排ガスが各蓄熱室２０Ａ，２０Ｂ内に供給されないようにし、燃焼排ガスが前記の各排ガス排出管２４Ａ，２４Ｂを通して排気されないようにしている。また、図示していないが、炉１の内部１ａの温度がある程度上昇した場合には、前記の各排ガス排出弁５１Ａ，５１Ｂを開けて、炉１の内部１ａにおける燃焼排ガスを各蓄熱室２０Ａ，２０Ｂ内に導き、各蓄熱室２０Ａ，２０Ｂにおける各蓄熱材２１Ａ，２１Ｂに燃焼排ガスの熱を蓄熱させるようにしてもよい。   In this first combustion state, the secondary air regulating valves 42A and 42B are closed so that the secondary combustion air is not supplied to the heat storage chambers 20A and 20B, and the secondary air guide pipes 22A. , 22B is prevented from being ejected into the interior 1a of the furnace 1 and the exhaust gas discharge valves 51A, 51B are closed, and the exhaust device 50 causes the combustion exhaust gas in the interior 1a of the furnace 1 to The heat storage chambers 20A and 20B are not supplied and the combustion exhaust gas is not exhausted through the exhaust gas exhaust pipes 24A and 24B. Although not shown, when the temperature in the interior 1a of the furnace 1 rises to some extent, the exhaust gas discharge valves 51A and 51B are opened, and the combustion exhaust gas in the interior 1a of the furnace 1 is transferred to the heat storage chambers 20A and 20A. The heat storage material 21A and 21B in each of the heat storage chambers 20A and 20B may be guided into the heat storage chamber 20B to store the heat of the combustion exhaust gas.

次いで、前記の第１燃焼状態の燃焼によって、炉１の内部１ａの温度が前記の第１温度領域より高くなった第２温度領域においては、図３に示すように、前記の第１燃焼状態の場合と同様に、１次空気案内管１１を通して１次燃焼室１３に導かれた１次燃焼用空気と燃料案内管１２を通して１次燃焼室１３に導かれた燃料とを１次燃焼室１３において混合させて燃焼させ、燃焼により発生した燃焼排ガスを、第１ノズル部１６を通して炉１の内部１ａに向けて噴出させるようにすると共に、前記の燃料調整弁３１により、燃料案内管１２に導く燃料の量を前記の第１燃焼状態よりも増加させる。このように燃料案内管１２に導く燃料の量を第１燃焼状態よりも増加させると、１次燃焼室１３における燃焼において一部の燃料が燃焼されずに、燃焼排ガスと一緒に前記の第１ノズル部１６から炉１の内部１ａに噴出されるようになる。   Next, in the second temperature range in which the temperature inside the furnace 1a is higher than the first temperature range due to the combustion in the first combustion state, as shown in FIG. In the same manner as in the above, the primary combustion air guided to the primary combustion chamber 13 through the primary air guide tube 11 and the fuel guided to the primary combustion chamber 13 through the fuel guide tube 12 are converted into the primary combustion chamber 13. The combustion exhaust gas generated by the combustion is jetted toward the inside 1a of the furnace 1 through the first nozzle portion 16 and guided to the fuel guide pipe 12 by the fuel adjustment valve 31. The amount of fuel is increased from the first combustion state. When the amount of the fuel guided to the fuel guide pipe 12 is increased as compared with the first combustion state in this way, a part of the fuel is not burned in the combustion in the primary combustion chamber 13, and the first exhaust gas is discharged together with the combustion exhaust gas. The nozzle portion 16 is ejected into the interior 1 a of the furnace 1.

そして、この第２温度領域においては、前記の各２次空気調整弁４２Ａ，４２Ｂ及び排ガス排出弁５１Ａ，５１Ｂの開閉を制御し、図３に示すように、一方の蓄熱室２０Ａにおいては、前記の排ガス排出弁５１Ａを閉じて、炉１の内部１ａにおける燃焼排ガスがこの蓄熱室２０Ａを通して排気されないようにした状態で、前記の２次空気調整弁４２Ａを開けて、前記の燃焼用空気供給装置４０から適当量の２次燃焼用空気を導き、この２次燃焼用空気を蓄熱室２０Ａ内における蓄熱材２１Ａに蓄熱された熱によって加熱させ、加熱された２次燃焼用空気を前記の２次空気案内管２２Ａを通して前記の第２ノズル部２３Ａから、前記の第１ノズル部１６を通して炉１の内部１ａに噴出された燃焼排ガスに向けて噴出させ、前記の燃焼排ガス中に含まれている未燃の燃料を燃焼させる燃焼動作を行うようにする（第２燃焼状態）。   And in this 2nd temperature range, opening and closing of each said secondary air regulating valve 42A, 42B and waste gas discharge valve 51A, 51B is controlled, and in one heat storage chamber 20A, as shown in FIG. In the state where the exhaust gas exhaust valve 51A is closed so that the combustion exhaust gas in the interior 1a of the furnace 1 is not exhausted through the heat storage chamber 20A, the secondary air regulating valve 42A is opened, and the combustion air supply device is An appropriate amount of secondary combustion air is led from 40, this secondary combustion air is heated by the heat stored in the heat storage material 21A in the heat storage chamber 20A, and the heated secondary combustion air is converted into the secondary combustion air. It is ejected from the second nozzle portion 23A through the air guide tube 22A toward the combustion exhaust gas ejected into the interior 1a of the furnace 1 through the first nozzle portion 16, and into the combustion exhaust gas. Rare and unburned fuel is to perform the combustion operation for burning (second combustion state).

また、他方の蓄熱室２０Ｂにおいては、前記の２次空気調整弁４２Ｂを閉じて、２次燃焼用空気がこの蓄熱室２０Ｂに供給されないようにした状態で、前記の排ガス排出弁５１Ｂを開け、前記の排気装置５０により、炉１の内部１ａにおける燃焼排ガスをこの蓄熱室２０Ｂ内に導き、この蓄熱室２０Ｂ内における蓄熱材２１Ｂに燃焼排ガスの熱を蓄熱させた後、この燃焼排ガスを前記の排ガス排出管２４Ｂを通して排気させる蓄熱動作を行うようにする。   In the other heat storage chamber 20B, the exhaust gas discharge valve 51B is opened with the secondary air regulating valve 42B closed to prevent secondary combustion air from being supplied to the heat storage chamber 20B. The exhaust device 50 guides the combustion exhaust gas in the interior 1a of the furnace 1 into the heat storage chamber 20B, stores the heat of the combustion exhaust gas in the heat storage material 21B in the heat storage chamber 20B, and then converts the combustion exhaust gas into the heat storage chamber 20B. A heat storage operation for exhausting through the exhaust gas discharge pipe 24B is performed.

その後、前記の各２次空気調整弁４２Ａ，４２Ｂ及び排ガス排出弁５１Ａ，５１Ｂの開閉を切り換え、炉１の内部１ａにおける燃焼排ガスが他方の蓄熱室２０Ｂを通して排気されないようにした状態で、他方の蓄熱室２０Ｂに、前記の２次空気調整弁４２Ｂを通して、前記の燃焼用空気供給装置４０から適当量の２次燃焼用空気を導き、この２次燃焼用空気を蓄熱室２０Ｂ内における蓄熱材２１Ｂに蓄熱された熱によって加熱させ、加熱された２次燃焼用空気を前記の２次空気案内管２２Ｂを通して前記の第２ノズル部２３Ｂから、前記の第１ノズル部１６を通して炉１の内部１ａに噴出された燃焼排ガスに向けて噴出させ、前記の燃焼排ガス中に含まれている未燃の燃料を燃焼させる燃焼動作を行うようにする（第２燃焼状態）。   Thereafter, the secondary air regulating valves 42A and 42B and the exhaust gas discharge valves 51A and 51B are switched to open and close so that the combustion exhaust gas in the interior 1a of the furnace 1 is not exhausted through the other heat storage chamber 20B. An appropriate amount of secondary combustion air is led from the combustion air supply device 40 to the heat storage chamber 20B through the secondary air regulating valve 42B, and this secondary combustion air is used as the heat storage material 21B in the heat storage chamber 20B. The heated secondary combustion air is heated from the second nozzle portion 23B through the secondary air guide tube 22B to the interior 1a of the furnace 1 through the first nozzle portion 16. The fuel is ejected toward the ejected combustion exhaust gas, and a combustion operation for burning unburned fuel contained in the combustion exhaust gas is performed (second combustion state).

また、一方の蓄熱室２０Ａにおいては、前記の２次空気調整弁４２Ａを閉じて、２次燃焼用空気がこの蓄熱室２０Ａに供給されないようにした状態で、前記の排ガス排出弁５１Ａを開け、前記の排気装置５０により、炉１の内部１ａにおける燃焼排ガスをこの蓄熱室２０Ａ内に導き、この蓄熱室２０Ａ内における蓄熱材２１Ａに燃焼排ガスの熱を蓄熱させた後、この燃焼排ガスを前記の排ガス排出管２４Ａを通して排気させる蓄熱動作を行うようにする。   In the one heat storage chamber 20A, the exhaust air discharge valve 51A is opened in a state where the secondary air adjustment valve 42A is closed so that the secondary combustion air is not supplied to the heat storage chamber 20A. The exhaust device 50 guides the combustion exhaust gas in the interior 1a of the furnace 1 into the heat storage chamber 20A, and stores the heat of the combustion exhaust gas in the heat storage material 21A in the heat storage chamber 20A. The heat storage operation of exhausting through the exhaust gas discharge pipe 24A is performed.

そして、前記の各２次空気調整弁４２Ａ，４２Ｂ及び排ガス排出弁５１Ａ，５１Ｂの開閉を交互に切り換え、前記の各蓄熱室２０Ａ，２０Ｂにおいて、前記の燃焼動作と蓄熱動作とを交互に切り換えて行うようにする。   Then, the secondary air regulating valves 42A and 42B and the exhaust gas discharge valves 51A and 51B are alternately switched, and the combustion operation and the heat storage operation are alternately switched in the heat storage chambers 20A and 20B. To do.

ここで、前記のような第２燃焼状態による燃焼を行うと、前記の燃焼排ガス中に含まれている未燃の燃料が確実に燃焼されるようになると共に、燃焼量が増加し、さらに炉１の内部１ａにおける燃焼排ガスの熱が有効に蓄熱されて、全体の熱効率を高めることができる。   Here, if the combustion in the second combustion state as described above is performed, unburned fuel contained in the combustion exhaust gas is surely burned, the combustion amount increases, and the furnace The heat of the combustion exhaust gas in the interior 1a of 1 is effectively stored, and the overall thermal efficiency can be increased.

そして、前記の第２燃焼状態の燃焼によって、炉１の内部１ａの温度が前記の第２温度領域より高くなった第３温度領域、例えば、燃料が自然着火する温度になった場合には、図４に示すように、前記の１次空気調整弁４１を閉じて、前記の燃焼用空気供給装置４０から１次空気案内管１１に１次燃焼用空気を供給しないようにし、燃料案内管１２を通して１次燃焼室１３に導かれた燃料を、そのまま前記の第１ノズル部１６を通して炉１の内部１ａに向けて噴出させるようにすると共に、前記の各２次空気調整弁４２Ａ，４２Ｂを調整して、前記の燃焼用空気供給装置４０から各蓄熱室２０Ａ，２０Ｂに供給する２次燃焼用空気の量を増加させると共に、前記のように各２次空気調整弁４２Ａ，４２Ｂ及び排ガス排出弁５１Ａ，５１Ｂの開閉を制御させるようにする。   When the combustion in the second combustion state reaches the third temperature range where the temperature of the interior 1a of the furnace 1 is higher than the second temperature range, for example, the temperature at which the fuel spontaneously ignites, As shown in FIG. 4, the primary air regulating valve 41 is closed so that the primary combustion air is not supplied from the combustion air supply device 40 to the primary air guide pipe 11. The fuel introduced to the primary combustion chamber 13 through the first combustion chamber 13 is directly jetted toward the inside 1a of the furnace 1 through the first nozzle portion 16, and the secondary air regulating valves 42A and 42B are adjusted. Then, the amount of secondary combustion air supplied from the combustion air supply device 40 to each of the heat storage chambers 20A and 20B is increased, and the secondary air regulating valves 42A and 42B and the exhaust gas discharge valve as described above. 51A, 51B open So as to control the.

そして、図４に示すように、一方の蓄熱室２０Ａにおいては、前記の排ガス排出弁５１Ａを閉じて、炉１の内部１ａにおける燃焼排ガスがこの蓄熱室２０Ａを通して排気されないようにした状態で、前記の２次空気調整弁４２Ａを開けて、前記の燃焼用空気供給装置４０から増加された２次燃焼用空気を導き、この２次燃焼用空気を蓄熱室２０Ａ内における蓄熱材２１Ａに蓄熱された熱によって加熱させ、加熱された２次燃焼用空気を前記の２次空気案内管２２Ａを通して前記の第２ノズル部２３Ａから、前記の第１ノズル部１６を通して炉１の内部１ａに噴出された燃料に向けて噴出させ、加熱された２次燃焼用空気と前記の燃料とを炉１の内部１ａにおいて混合させて燃焼させる燃焼動作を行うようにする（第３燃焼状態）。   Then, as shown in FIG. 4, in one heat storage chamber 20A, the exhaust gas discharge valve 51A is closed so that the combustion exhaust gas in the interior 1a of the furnace 1 is not exhausted through the heat storage chamber 20A. The secondary air adjustment valve 42A is opened, the secondary combustion air increased from the combustion air supply device 40 is guided, and the secondary combustion air is stored in the heat storage material 21A in the heat storage chamber 20A. Fuel heated by heat, and the heated secondary combustion air is jetted from the second nozzle part 23A through the secondary air guide pipe 22A to the interior 1a of the furnace 1 through the first nozzle part 16 The combustion operation is performed in which the heated secondary combustion air and the fuel are mixed in the interior 1a of the furnace 1 and burned (third combustion state).

また、他方の蓄熱室２０Ｂにおいては、前記の２次空気調整弁４２Ｂを閉じて、２次燃焼用空気がこの蓄熱室２０Ｂに供給されないようにした状態で、前記の排ガス排出弁５１Ｂを開け、前記の排気装置５０により、炉１の内部１ａにおける燃焼排ガスをこの蓄熱室２０Ｂ内に導き、この蓄熱室２０Ｂ内における蓄熱材２１Ｂに燃焼排ガスの熱を蓄熱させた後、この燃焼排ガスを前記の排ガス排出管２４Ｂを通して排気させる蓄熱動作を行うようにする。   In the other heat storage chamber 20B, the exhaust gas discharge valve 51B is opened with the secondary air regulating valve 42B closed to prevent secondary combustion air from being supplied to the heat storage chamber 20B. The exhaust device 50 guides the combustion exhaust gas in the interior 1a of the furnace 1 into the heat storage chamber 20B, stores the heat of the combustion exhaust gas in the heat storage material 21B in the heat storage chamber 20B, and then converts the combustion exhaust gas into the heat storage chamber 20B. A heat storage operation for exhausting through the exhaust gas discharge pipe 24B is performed.

そして、前記の場合と同様に、各２次空気調整弁４２Ａ，４２Ｂ及び排ガス排出弁５１Ａ，５１Ｂの開閉を交互に切り換え、前記の各蓄熱室２０Ａ，２０Ｂにおいて、前記の燃焼動作と蓄熱動作とを交互に切り換えて行うようにする。   As in the case described above, the opening and closing of the secondary air regulating valves 42A and 42B and the exhaust gas discharge valves 51A and 51B are alternately switched, and the combustion operation and the heat storage operation are performed in the heat storage chambers 20A and 20B. Switch between and alternately.

ここで、前記のような第３燃焼状態による燃焼を行うと、前記のように炉１の内部１ａに噴出された燃料が前記のように加熱された２次燃焼用空気と自然着火する温度以上に加熱された炉１の内部１ａにおいて適切に混合されて広い範囲で燃焼されるようになり、燃焼効率が高められると共に、局部的な燃焼によって温度が局部的に上昇するのが抑制され、ＮＯｘが発生するのも適切に防止されるようになる。   Here, when combustion is performed in the third combustion state as described above, the fuel injected into the interior 1a of the furnace 1 as described above is at or above the temperature at which the secondary combustion air heated as described above spontaneously ignites. In the interior 1a of the furnace 1 heated to a high temperature, the mixture is appropriately mixed and burned over a wide range, the combustion efficiency is improved, and the local increase in temperature due to local combustion is suppressed, and NOx It is possible to appropriately prevent the occurrence of this.

この結果、この実施形態１の燃焼装置Ａ１においては、炉１の内部１ａ温度に対応させて燃焼状態を適切に制御し、低温域から高温域において安定した燃焼性能が得られると共に、高温域におけるＮＯｘの発生も適切に抑制できるようになる。   As a result, in the combustion apparatus A1 of the first embodiment, the combustion state is appropriately controlled in accordance with the temperature inside the furnace 1a, and stable combustion performance can be obtained from the low temperature range to the high temperature range. Generation of NOx can be appropriately suppressed.

（実施形態２）
実施形態２の燃焼装置Ａ２においては、図５に示すように、図１に示した実施形態１の燃焼装置Ａ１における前記の燃料供給装置３０から燃料調整弁３１を介して前記の燃料案内管１２に燃料を供給する前に、前記の燃料に対して燃焼用空気供給装置４０から予備燃焼用空気を供給する予備空気供給経路（予備空気供給手段）４３を設けると共に、この予備空気供給経路４３に予備燃焼用空気の供給を制御する予備空気調整弁（予備空気制御手段）４４を設け、前記のスパークプラグ１５を前記の燃料案内管１２内に設けるようにし、それ以外は、図１に示した実施形態１の燃焼装置Ａ１と同様に構成している。なお、図６〜図９における各弁３１，４１，４２，４４，５１の開閉については、実施形態１の場合と同様に、開いた状態を白抜きで、閉じた状態を黒塗りで示した。
(Embodiment 2)
In the combustion apparatus A2 of the second embodiment, as shown in FIG. 5, the fuel guide pipe 12 is connected from the fuel supply device 30 in the combustion apparatus A1 of the first embodiment shown in FIG. Before the fuel is supplied to the fuel, a preliminary air supply path (preliminary air supply means) 43 for supplying preliminary combustion air from the combustion air supply device 40 to the fuel is provided. A preliminary air regulating valve (preliminary air control means) 44 for controlling the supply of the preliminary combustion air is provided, and the spark plug 15 is provided in the fuel guide pipe 12, and the others are shown in FIG. The configuration is the same as that of the combustion apparatus A1 of the first embodiment. In addition, about the opening and closing of each valve 31,41,42,44,51 in FIGS. 6-9, the open state is shown in white and the closed state is shown in black as in the case of the first embodiment. .

ここで、この実施形態２の燃焼装置Ａ２においては、炉１の内部１ａの温度が低い第１温度領域において、前記の第１燃焼状態による燃焼を行う前に、図６に示すように、前記の１次空気調整弁４１を閉じて、前記の燃焼用空気供給装置４０から１次空気案内管１１に１次燃焼用空気が供給されないようにした状態で、前記の燃料調整弁３１により燃料供給装置３０から少量の燃料を燃料案内管１２に導くと共に、前記の予備空気調整弁４４を開けて、燃焼用空気供給装置４０から予備空気供給経路４３を通して、少量の予備燃焼用空気を燃料案内管１２に導かれる燃料に供給し、前記の燃料案内管１２内において燃料と予備燃焼用空気とを予備混合（予混合）させる。   Here, in the combustion apparatus A2 of the second embodiment, before performing combustion in the first combustion state in the first temperature region where the temperature inside the furnace 1a is low, as shown in FIG. The primary air regulating valve 41 is closed, and the primary combustion air is not supplied to the primary air guide pipe 11 from the combustion air supply device 40, and the fuel is supplied by the fuel regulating valve 31. A small amount of fuel is guided from the device 30 to the fuel guide pipe 12 and the preliminary air adjustment valve 44 is opened, and a small amount of preliminary combustion air is supplied from the combustion air supply device 40 through the preliminary air supply path 43. The fuel is supplied to the fuel 12, and the fuel and the preliminary combustion air are premixed (premixed) in the fuel guide pipe 12.

そして、このように予備混合された燃料と予備燃焼用空気とを、燃料案内管１２から１次燃焼室１３に噴出させると共に、燃料案内管１２の内部に設けられた前記のスパークプラグ１５によって着火させて、予備混合された燃料と予備燃焼用空気とを予備燃焼させ、予備燃焼により発生した燃焼排ガスを、前記の第１ノズル部１６を通して前記の１次燃焼室１３から炉１の内部１ａに向けて噴出させるようにする。このようにすると、前記の予備燃焼によって前記の１次燃焼室１３や炉１の内部１ａが予備加熱されるようになる（予備加熱燃焼状態という）。なお、この予備加熱燃焼状態は、前記の実施形態１においても、図２における１次燃焼用空気と燃料とを少量にすることで可能になる。   The premixed fuel and precombustion air are ejected from the fuel guide pipe 12 to the primary combustion chamber 13 and ignited by the spark plug 15 provided in the fuel guide pipe 12. The premixed fuel and the precombustion air are preburned, and the combustion exhaust gas generated by the precombustion is passed from the primary combustion chamber 13 to the inside 1a of the furnace 1 through the first nozzle portion 16. Try to blow out. Thus, the primary combustion chamber 13 and the interior 1a of the furnace 1 are preheated by the preliminary combustion (referred to as a preheated combustion state). Note that this preheating combustion state can also be achieved by reducing the amount of primary combustion air and fuel in FIG.

その後は、炉１の内部１ａの温度が低い第１温度領域において、図７に示すように、前記の１次空気調整弁４１を開けて適当量の１次燃焼用空気を１次空気案内管１１に導くと共に、前記の燃料調整弁３１を通して燃料案内管１２に導く燃料の量を予備燃焼時よりも増加させ、前記の実施形態１の燃焼装置Ａ１の場合と同様に、前記の１次空気案内管１１を通して１次燃焼室１３に導かれた１次燃焼用空気と、燃料案内管１２を通して１次燃焼室１３に導かれた燃料とを、１次燃焼室１３において混合させて燃焼させ、燃焼により発生した燃焼排ガスを、前記の第１ノズル部１６を通して前記の１次燃焼室１３から炉１の内部１ａに向けて噴出させるようにする（第１燃焼状態）と共に、前記の予備空気調整弁４４を閉じて、燃料案内管１２に導かれる燃料に予備燃焼用空気が供給されないようにする。   Thereafter, in the first temperature range where the temperature inside the furnace 1a is low, as shown in FIG. 7, the primary air regulating valve 41 is opened to supply an appropriate amount of primary combustion air to the primary air guide pipe. 11, and the amount of fuel guided to the fuel guide pipe 12 through the fuel adjustment valve 31 is increased as compared with the time of preliminary combustion. As in the case of the combustion apparatus A1 of the first embodiment, the primary air is The primary combustion air guided to the primary combustion chamber 13 through the guide tube 11 and the fuel guided to the primary combustion chamber 13 through the fuel guide tube 12 are mixed and burned in the primary combustion chamber 13, Combustion exhaust gas generated by combustion is ejected from the primary combustion chamber 13 toward the inside 1a of the furnace 1 through the first nozzle portion 16 (first combustion state), and the preliminary air adjustment is performed. The valve 44 is closed and the fuel guide pipe 12 Air preliminary combustion is not supplied to the fuel introduced.

また、この第１燃焼状態の燃焼によって、炉１の内部１ａの温度が前記の第１温度領域より高くなった第２温度領域においては、前記の実施形態１の燃焼装置Ａ１の場合と同様に、前記の第１燃焼状態の場合よりも燃料案内管１２に導く燃料の量を増加させると共に、前記の実施形態１の燃焼装置Ａ１の場合と同様に、各２次空気調整弁４２Ａ，４２Ｂ及び排ガス排出弁５１Ａ，５１Ｂの開閉を制御させるようにする。   Further, in the second temperature range in which the temperature of the interior 1a of the furnace 1 becomes higher than the first temperature range due to the combustion in the first combustion state, similarly to the case of the combustion apparatus A1 of the first embodiment. The amount of fuel led to the fuel guide pipe 12 is increased as compared with the case of the first combustion state, and the secondary air regulating valves 42A, 42B and the like, as in the case of the combustion device A1 of the first embodiment. The opening / closing of the exhaust gas discharge valves 51A and 51B is controlled.

そして、図８に示すように、一方の蓄熱室２０Ａにおいては、前記の排ガス排出弁５１Ａを閉じて、炉１の内部１ａにおける燃焼排ガスがこの蓄熱室２０Ａを通して排気されないようにした状態で、前記の２次空気調整弁４２Ａを開けて、前記の燃焼用空気供給装置４０から適当量の２次燃焼用空気を導き、この２次燃焼用空気を蓄熱室２０Ａ内における蓄熱材２１Ａに蓄熱された熱によって加熱させ、加熱された２次燃焼用空気を前記の２次空気案内管２２Ａを通して前記の第２ノズル部２３Ａから、前記の第１ノズル部１６を通して炉１の内部１ａに噴出された燃焼排ガスに向けて噴出させ、前記の燃焼排ガス中に含まれている未燃の燃料を燃焼させる燃焼動作を行うようにする（第２燃焼状態）。   As shown in FIG. 8, in one heat storage chamber 20A, the exhaust gas discharge valve 51A is closed so that the combustion exhaust gas in the interior 1a of the furnace 1 is not exhausted through the heat storage chamber 20A. The secondary air regulating valve 42A is opened, an appropriate amount of secondary combustion air is introduced from the combustion air supply device 40, and this secondary combustion air is stored in the heat storage material 21A in the heat storage chamber 20A. Combustion that is heated by heat, and the heated secondary combustion air is jetted from the second nozzle portion 23A through the secondary air guide tube 22A to the interior 1a of the furnace 1 through the first nozzle portion 16. The fuel is ejected toward the exhaust gas, and a combustion operation for burning unburned fuel contained in the combustion exhaust gas is performed (second combustion state).

また、他方の蓄熱室２０Ｂにおいては、前記の２次空気調整弁４２Ｂを閉じて、２次燃焼用空気がこの蓄熱室２０Ｂに供給されないようにした状態で、前記の排ガス排出弁５１Ｂを開け、前記の排気装置５０により、炉１の内部１ａにおける燃焼排ガスをこの蓄熱室２０Ｂ内に導き、この蓄熱室２０Ｂ内における蓄熱材２１Ｂに燃焼排ガスの熱を蓄熱させた後、この燃焼排ガスを前記の排ガス排出管２４Ｂを通して排気させる蓄熱動作を行うようにする。   In the other heat storage chamber 20B, the exhaust gas discharge valve 51B is opened with the secondary air regulating valve 42B closed to prevent secondary combustion air from being supplied to the heat storage chamber 20B. The exhaust device 50 guides the combustion exhaust gas in the interior 1a of the furnace 1 into the heat storage chamber 20B, stores the heat of the combustion exhaust gas in the heat storage material 21B in the heat storage chamber 20B, and then converts the combustion exhaust gas into the heat storage chamber 20B. A heat storage operation for exhausting through the exhaust gas discharge pipe 24B is performed.

そして、前記の場合と同様に、各２次空気調整弁４２Ａ，４２Ｂ及び排ガス排出弁５１Ａ，５１Ｂの開閉を交互に切り換え、前記の各蓄熱室２０Ａ，２０Ｂにおいて、前記の燃焼動作と蓄熱動作とを交互に切り換えて行うようにする。   As in the case described above, the opening and closing of the secondary air regulating valves 42A and 42B and the exhaust gas discharge valves 51A and 51B are alternately switched, and the combustion operation and the heat storage operation are performed in the heat storage chambers 20A and 20B. Switch between and alternately.

また、前記の第２燃焼状態の燃焼によって、炉１の内部１ａの温度が前記の第２温度領域より高くなって燃料が自然着火する第３温度領域においては、前記の実施形態１の燃焼装置Ａ１の場合と同様に、図９に示すように、前記の１次空気調整弁４１を閉じて、前記の燃焼用空気供給装置４０から１次空気案内管１１に１次燃焼用空気が供給されないようにし、燃料案内管１２を通して１次燃焼室１３に導かれた燃料を、そのまま前記の第１ノズル部１６を通して炉１の内部１ａに向けて噴出させるようにすると共に、前記の各２次空気調整弁４２Ａ，４２Ｂを調整して、前記の燃焼用空気供給装置４０から各蓄熱室２０Ａ，２０Ｂに供給する２次燃焼用空気の量を増加させると共に、前記の実施形態１の燃焼装置Ａ１の場合と同様に、各２次空気調整弁４２Ａ，４２Ｂ及び排ガス排出弁５１Ａ，５１Ｂの開閉を制御させるようにする。   Further, in the third temperature region where the temperature of the interior 1a of the furnace 1 becomes higher than the second temperature region due to the combustion in the second combustion state and the fuel spontaneously ignites, the combustion apparatus of the first embodiment. As in the case of A1, as shown in FIG. 9, the primary air regulating valve 41 is closed, and the primary combustion air is not supplied to the primary air guide pipe 11 from the combustion air supply device 40. In this way, the fuel guided to the primary combustion chamber 13 through the fuel guide tube 12 is jetted as it is toward the interior 1a of the furnace 1 through the first nozzle portion 16, and each of the secondary airs described above. The adjustment valves 42A and 42B are adjusted to increase the amount of secondary combustion air supplied from the combustion air supply device 40 to the heat storage chambers 20A and 20B, and the combustion device A1 of the first embodiment is used. As in the case, each 2 Air regulating valve 42A, 42B and exhaust gas discharge valve 51A, so as to control the opening and closing of 51B.

そして、図９に示すように、一方の蓄熱室２０Ａにおいては、前記の排ガス排出弁５１Ａを閉じて、炉１の内部１ａにおける燃焼排ガスがこの蓄熱室２０Ａを通して排気されないようにした状態で、前記の２次空気調整弁４２Ａを開けて、前記の燃焼用空気供給装置４０から増加された２次燃焼用空気を導き、この２次燃焼用空気を蓄熱室２０Ａ内における蓄熱材２１Ａに蓄熱された熱によって加熱させ、加熱された２次燃焼用空気を前記の２次空気案内管２２Ａを通して前記の第２ノズル部２３Ａから、前記の第１ノズル部１６を通して炉１の内部１ａに噴出された燃料に向けて噴出させ、加熱された２次燃焼用空気と前記の燃料とを炉１の内部１ａにおいて混合させて燃焼させる燃焼動作を行うようにする（第３燃焼状態）。   Then, as shown in FIG. 9, in one heat storage chamber 20A, the exhaust gas discharge valve 51A is closed so that the combustion exhaust gas in the interior 1a of the furnace 1 is not exhausted through the heat storage chamber 20A. The secondary air adjustment valve 42A is opened, the secondary combustion air increased from the combustion air supply device 40 is guided, and the secondary combustion air is stored in the heat storage material 21A in the heat storage chamber 20A. Fuel heated by heat, and the heated secondary combustion air is jetted from the second nozzle part 23A through the secondary air guide pipe 22A to the interior 1a of the furnace 1 through the first nozzle part 16 The combustion operation is performed in which the heated secondary combustion air and the fuel are mixed in the interior 1a of the furnace 1 and burned (third combustion state).

また、他方の蓄熱室２０Ｂにおいては、前記の２次空気調整弁４２Ｂを閉じて、２次燃焼用空気がこの蓄熱室２０Ｂに供給されないようにした状態で、前記の排ガス排出弁５１Ｂを開け、前記の排気装置５０により、炉１の内部１ａにおける燃焼排ガスをこの蓄熱室２０Ｂ内に導き、この蓄熱室２０Ｂ内における蓄熱材２１Ｂに燃焼排ガスの熱を蓄熱させた後、この燃焼排ガスを前記の排ガス排出管２４Ｂを通して排気させる蓄熱動作を行うようにする。   In the other heat storage chamber 20B, the exhaust gas discharge valve 51B is opened with the secondary air regulating valve 42B closed to prevent secondary combustion air from being supplied to the heat storage chamber 20B. The exhaust device 50 guides the combustion exhaust gas in the interior 1a of the furnace 1 into the heat storage chamber 20B, stores the heat of the combustion exhaust gas in the heat storage material 21B in the heat storage chamber 20B, and then converts the combustion exhaust gas into the heat storage chamber 20B. A heat storage operation for exhausting through the exhaust gas discharge pipe 24B is performed.

そして、前記の場合と同様に、各２次空気調整弁４２Ａ，４２Ｂ及び排ガス排出弁５１Ａ，５１Ｂの開閉を交互に切り換え、前記の各蓄熱室２０Ａ，２０Ｂにおいて、前記の燃焼動作と蓄熱動作とを交互に切り換えて行うようにする。   As in the case described above, the opening and closing of the secondary air regulating valves 42A and 42B and the exhaust gas discharge valves 51A and 51B are alternately switched, and the combustion operation and the heat storage operation are performed in the heat storage chambers 20A and 20B. Switch between and alternately.

このようにすると、この実施形態２の燃焼装置Ａ２においても、前記の実施形態１の燃焼装置Ａ１と同様に、炉１の内部１ａ温度に対応させて燃焼状態を適切に制御し、低温域から高温域において安定した燃焼性能が得られると共に、高温域におけるＮＯｘの発生も適切に抑制できるようになる。   In this way, also in the combustion apparatus A2 of the second embodiment, similarly to the combustion apparatus A1 of the first embodiment, the combustion state is appropriately controlled in accordance with the temperature inside the furnace 1a, and from the low temperature range. Stable combustion performance can be obtained in the high temperature range, and generation of NOx in the high temperature range can be appropriately suppressed.

（実施形態３）
実施形態３の燃焼装置Ａ３においては、図１０に示すように、図１に示した実施形態１の燃焼装置Ａ１における燃料案内管１２と１次空気案内管１１との間に、燃料案内管１２よりも長くなった予備空気案内管（予備空気供給手段）１７を設け、この予備空気案内管１７の内部に、燃料と予備燃焼用空気とを混合させる予備混合部１７ａを形成すると共に、この予備空気案内管１７に前記の燃焼用空気供給装置４０から予備燃焼用空気を供給する予備空気供給経路（予備空気供給手段）４３を設け、この予備空気供給経路４３に予備燃焼用空気の供給を制御する予備空気調整弁（予備空気制御手段）４４を設けるようにしており、それ以外は、図１に示した実施形態１の燃焼装置Ａ１と同様に構成している。また、図１１〜図１４における各弁３１，４１，４２，４４，５１の開閉については、実施形態１，２の場合と同様に、開いた状態を白抜きで、閉じた状態を黒塗りで示した。 (Embodiment 3)
In the combustion apparatus A3 of the third embodiment, as shown in FIG. 10, the fuel guide pipe 12 is interposed between the fuel guide pipe 12 and the primary air guide pipe 11 in the combustion apparatus A1 of the first embodiment shown in FIG. A preliminary air guide pipe (preliminary air supply means) 17 that is longer than the preliminary air guide pipe 17 is formed, and a preliminary mixing section 17a that mixes fuel and preliminary combustion air is formed inside the preliminary air guide pipe 17, and The air guide pipe 17 is provided with a preliminary air supply path (preliminary air supply means) 43 for supplying preliminary combustion air from the combustion air supply device 40, and the supply of the preliminary combustion air to the preliminary air supply path 43 is controlled. A spare air regulating valve (preliminary air control means) 44 is provided, and the rest of the configuration is the same as that of the combustion apparatus A1 of the first embodiment shown in FIG. Moreover, about the opening and closing of each valve 31,41,42,44,51 in FIGS. 11-14, as in the case of Embodiment 1, 2, the open state is outlined and the closed state is painted black. Indicated.

そして、この実施形態３の燃焼装置Ａ３においては、炉１の内部１ａの温度が低い第１温度領域において、前記の第１燃焼状態による燃焼を行う前に、図１１に示すように、前記の１次空気調整弁４１を閉じて、前記の燃焼用空気供給装置４０から１次空気案内管１１に１次燃焼用空気が供給されないようにした状態で、前記の燃料調整弁３１により燃料供給装置３０から少量の燃料を燃料案内管１２に導くと共に、前記の予備空気調整弁４４を開けて、燃焼用空気供給装置４０から予備空気供給経路４３を通して、少量の予備燃焼用空気を前記の予備空気案内管１７に供給し、この予備空気案内管１７内を通して導かれた予備燃焼用空気を、前記の予備混合部１７ａにおいて前記の燃料案内管１２内を通して導かれた燃料とを混合させる。   And in the combustion apparatus A3 of this Embodiment 3, before performing combustion by the said 1st combustion state in the 1st temperature range where the temperature of the inside 1a of the furnace 1 is low, as shown in FIG. In the state where the primary air adjustment valve 41 is closed so that the primary combustion air is not supplied from the combustion air supply device 40 to the primary air guide pipe 11, the fuel supply device by the fuel adjustment valve 31. A small amount of fuel is led from 30 to the fuel guide pipe 12 and the preliminary air adjusting valve 44 is opened, and a small amount of preliminary combustion air is supplied from the combustion air supply device 40 through the preliminary air supply path 43 to the preliminary air. The preliminary combustion air supplied to the guide pipe 17 and guided through the preliminary air guide pipe 17 is mixed with the fuel guided through the fuel guide pipe 12 in the preliminary mixing portion 17a.

また、このように混合された燃料と予備燃焼用空気とを、予備空気案内管１７から１次燃焼室１３に噴出させると共に前記のスパークプラグ１５によって着火させ、予備混合された燃料と予備燃焼用空気とを予備燃焼させて、予備燃焼により発生した燃焼排ガスを、前記の第１ノズル部１６を通して前記の１次燃焼室１３から炉１の内部１ａに向けて噴出させるようにする。このようにすると、前記の予備燃焼によって前記の１次燃焼室１３や炉１の内部１ａが予備加熱されるようになる（予備加熱燃焼状態）。   Further, the fuel and the preliminary combustion air mixed in this way are ejected from the preliminary air guide pipe 17 to the primary combustion chamber 13 and ignited by the spark plug 15, and the preliminary mixed fuel and preliminary combustion air are used. Air is pre-combusted, and combustion exhaust gas generated by the pre-combustion is ejected from the primary combustion chamber 13 toward the interior 1 a of the furnace 1 through the first nozzle portion 16. Thus, the primary combustion chamber 13 and the interior 1a of the furnace 1 are preheated by the preliminary combustion (preheating combustion state).

その後は、炉１の内部１ａの温度が低い第１温度領域において、図１２に示すように、前記の１次空気調整弁４１を開けて適当量の１次燃焼用空気を１次空気案内管１１に導くと共に、前記の燃料調整弁３１を通して燃料案内管１２に導く燃料の量を予備燃焼時から増加させ、前記の実施形態１，２の燃焼装置Ａ１，Ａ２の場合と同様に、前記の１次空気案内管１１を通して１次燃焼室１３に導かれた１次燃焼用空気と、燃料案内管１２を通して１次燃焼室１３に導かれた燃料とを、１次燃焼室１３において混合させて燃焼させ、燃焼により発生した燃焼排ガスを、前記の第１ノズル部１６を通して前記の１次燃焼室１３から炉１の内部１ａに向けて噴出させるようにする（第１燃焼状態）と共に、前記の予備空気調整弁４４を閉じて、予備燃焼用空気が予備空気案内管１７に供給されないようにする。   Thereafter, in the first temperature region where the temperature inside the furnace 1a is low, as shown in FIG. 12, the primary air regulating valve 41 is opened to supply an appropriate amount of primary combustion air to the primary air guide tube. 11, and the amount of fuel guided to the fuel guide pipe 12 through the fuel adjustment valve 31 is increased from the time of preliminary combustion. As in the case of the combustion apparatuses A 1 and A 2 of the first and second embodiments, The primary combustion air guided to the primary combustion chamber 13 through the primary air guide tube 11 and the fuel guided to the primary combustion chamber 13 through the fuel guide tube 12 are mixed in the primary combustion chamber 13. Combustion exhaust gas generated by combustion is ejected from the primary combustion chamber 13 toward the inside 1a of the furnace 1 through the first nozzle portion 16 (first combustion state), and Close the spare air adjustment valve 44 Baked air is not supplied to the supplemental air guide tube 17.

また、この第１燃焼状態の燃焼によって、炉１の内部１ａの温度が前記の第１温度領域より高くなった第２温度領域においては、前記の実施形態１，２の燃焼装置Ａ１，Ａ２の場合と同様に、前記の第１燃焼状態の場合よりも燃料案内管１２に導く燃料の量を増加させると共に、各２次空気調整弁４２Ａ，４２Ｂ及び排ガス排出弁５１Ａ，５１Ｂの開閉を制御させるようにする。   Further, in the second temperature region where the temperature of the interior 1a of the furnace 1 becomes higher than the first temperature region by the combustion in the first combustion state, the combustion devices A1 and A2 of the first and second embodiments described above are used. Similarly to the case, the amount of fuel guided to the fuel guide pipe 12 is increased as compared with the case of the first combustion state, and the opening and closing of the secondary air regulating valves 42A and 42B and the exhaust gas discharge valves 51A and 51B are controlled. Like that.

そして、図１３に示すように、一方の蓄熱室２０Ａにおいては、前記の排ガス排出弁５１Ａを閉じて、炉１の内部１ａにおける燃焼排ガスがこの蓄熱室２０Ａを通して排気されないようにした状態で、前記の２次空気調整弁４２Ａを開けて、前記の燃焼用空気供給装置４０から適当量の２次燃焼用空気を導き、この２次燃焼用空気を蓄熱室２０Ａ内における蓄熱材２１Ａに蓄熱された熱によって加熱させ、加熱された２次燃焼用空気を前記の２次空気案内管２２Ａを通して前記の第２ノズル部２３Ａから、前記の第１ノズル部１６を通して炉１の内部１ａに噴出された燃焼排ガスに向けて噴出させ、前記の燃焼排ガス中に含まれている未燃の燃料を燃焼させる燃焼動作を行うようにする（第２燃焼状態）。   As shown in FIG. 13, in one heat storage chamber 20A, the exhaust gas discharge valve 51A is closed so that the combustion exhaust gas in the interior 1a of the furnace 1 is not exhausted through the heat storage chamber 20A. The secondary air regulating valve 42A is opened, an appropriate amount of secondary combustion air is introduced from the combustion air supply device 40, and this secondary combustion air is stored in the heat storage material 21A in the heat storage chamber 20A. Combustion that is heated by heat, and the heated secondary combustion air is jetted from the second nozzle portion 23A through the secondary air guide tube 22A to the interior 1a of the furnace 1 through the first nozzle portion 16. The fuel is ejected toward the exhaust gas, and a combustion operation for burning unburned fuel contained in the combustion exhaust gas is performed (second combustion state).

また、他方の蓄熱室２０Ｂにおいては、前記の２次空気調整弁４２Ｂを閉じて、２次燃焼用空気がこの蓄熱室２０Ｂに供給されないようにした状態で、前記の排ガス排出弁５１Ｂを開け、前記の排気装置５０により、炉１の内部１ａにおける燃焼排ガスをこの蓄熱室２０Ｂ内に導き、この蓄熱室２０Ｂ内における蓄熱材２１Ｂに燃焼排ガスの熱を蓄熱させた後、この燃焼排ガスを前記の排ガス排出管２４Ｂを通して排気させる蓄熱動作を行うようにする。   In the other heat storage chamber 20B, the exhaust gas discharge valve 51B is opened with the secondary air regulating valve 42B closed to prevent secondary combustion air from being supplied to the heat storage chamber 20B. The exhaust device 50 guides the combustion exhaust gas in the interior 1a of the furnace 1 into the heat storage chamber 20B, stores the heat of the combustion exhaust gas in the heat storage material 21B in the heat storage chamber 20B, and then converts the combustion exhaust gas into the heat storage chamber 20B. A heat storage operation for exhausting through the exhaust gas discharge pipe 24B is performed.

そして、前記の場合と同様に、各２次空気調整弁４２Ａ，４２Ｂ及び排ガス排出弁５１Ａ，５１Ｂの開閉を交互に切り換え、前記の各蓄熱室２０Ａ，２０Ｂにおいて、前記の燃焼動作と蓄熱動作とを交互に切り換えて行うようにする。   As in the case described above, the opening and closing of the secondary air regulating valves 42A and 42B and the exhaust gas discharge valves 51A and 51B are alternately switched, and the combustion operation and the heat storage operation are performed in the heat storage chambers 20A and 20B. Switch between and alternately.

また、前記の第２燃焼状態の燃焼によって、炉１の内部１ａの温度が前記の第２温度領域より高くなって燃料が自然着火する第３温度領域においては、前記の実施形態１，２の燃焼装置Ａ１，Ａ２と同様に、図１４に示すように、前記の１次空気調整弁４１を閉じて、前記の燃焼用空気供給装置４０から１次空気案内管１１に１次燃焼用空気が供給されないようにし、燃料案内管１２を通して１次燃焼室１３に導かれた燃料を、そのまま前記の第１ノズル部１６を通して炉１の内部１ａに向けて噴出させるようにすると共に、前記の各２次空気調整弁４２Ａ，４２Ｂを調整して、前記の燃焼用空気供給装置４０から各蓄熱室２０Ａ，２０Ｂに供給する２次燃焼用空気の量を増加させると共に、前記の実施形態１の燃焼装置Ａ１の場合と同様に、各２次空気調整弁４２Ａ，４２Ｂ及び排ガス排出弁５１Ａ，５１Ｂの開閉を制御させるようにする。   Further, in the third temperature region where the temperature of the interior 1a of the furnace 1 becomes higher than the second temperature region due to the combustion in the second combustion state and the fuel spontaneously ignites, As in the combustion apparatuses A1 and A2, as shown in FIG. 14, the primary air regulating valve 41 is closed, and the primary combustion air is supplied from the combustion air supply apparatus 40 to the primary air guide pipe 11. The fuel guided to the primary combustion chamber 13 through the fuel guide tube 12 is jetted as it is through the first nozzle portion 16 toward the interior 1a of the furnace 1, and each of the two The secondary air regulating valves 42A and 42B are adjusted to increase the amount of secondary combustion air supplied from the combustion air supply device 40 to the heat storage chambers 20A and 20B, and the combustion device of the first embodiment is used. As with A1 Each secondary air control valve 42A, 42B and exhaust gas discharge valve 51A, so as to control the opening and closing of 51B.

そして、図１４に示すように、一方の蓄熱室２０Ａにおいては、前記の排ガス排出弁５１Ａを閉じて、炉１の内部１ａにおける燃焼排ガスがこの蓄熱室２０Ａを通して排気されないようにした状態で、前記の２次空気調整弁４２Ａを開けて、前記の燃焼用空気供給装置４０から増加された２次燃焼用空気を導き、この２次燃焼用空気を蓄熱室２０Ａ内における蓄熱材２１Ａに蓄熱された熱によって加熱させ、加熱された２次燃焼用空気を前記の２次空気案内管２２Ａを通して前記の第２ノズル部２３Ａから、前記の第１ノズル部１６を通して炉１の内部１ａに噴出された燃料に向けて噴出させ、加熱された２次燃焼用空気と前記の燃料とを炉１の内部１ａにおいて混合させて燃焼させる燃焼動作を行うようにする（第３燃焼状態）。   As shown in FIG. 14, in one heat storage chamber 20A, the exhaust gas discharge valve 51A is closed so that the combustion exhaust gas in the interior 1a of the furnace 1 is not exhausted through the heat storage chamber 20A. The secondary air adjustment valve 42A is opened, the secondary combustion air increased from the combustion air supply device 40 is guided, and the secondary combustion air is stored in the heat storage material 21A in the heat storage chamber 20A. Fuel heated by heat, and the heated secondary combustion air is jetted from the second nozzle part 23A through the secondary air guide pipe 22A to the interior 1a of the furnace 1 through the first nozzle part 16 The combustion operation is performed in which the heated secondary combustion air and the fuel are mixed in the interior 1a of the furnace 1 and burned (third combustion state).

また、他方の蓄熱室２０Ｂにおいては、前記の２次空気調整弁４２Ｂを閉じて、２次燃焼用空気がこの蓄熱室２０Ｂに供給されないようにした状態で、前記の排ガス排出弁５１Ｂを開け、前記の排気装置５０により、炉１の内部１ａにおける燃焼排ガスをこの蓄熱室２０Ｂ内に導き、この蓄熱室２０Ｂ内における蓄熱材２１Ｂに燃焼排ガスの熱を蓄熱させた後、この燃焼排ガスを前記の排ガス排出管２４Ｂを通して排気させる蓄熱動作を行うようにする。   In the other heat storage chamber 20B, the exhaust gas discharge valve 51B is opened with the secondary air regulating valve 42B closed to prevent secondary combustion air from being supplied to the heat storage chamber 20B. The exhaust device 50 guides the combustion exhaust gas in the interior 1a of the furnace 1 into the heat storage chamber 20B, stores the heat of the combustion exhaust gas in the heat storage material 21B in the heat storage chamber 20B, and then converts the combustion exhaust gas into the heat storage chamber 20B. A heat storage operation for exhausting through the exhaust gas discharge pipe 24B is performed.

そして、前記の場合と同様に、各２次空気調整弁４２Ａ，４２Ｂ及び排ガス排出弁５１Ａ，５１Ｂの開閉を交互に切り換え、前記の各蓄熱室２０Ａ，２０Ｂにおいて、前記の燃焼動作と蓄熱動作とを交互に切り換えて行うようにする。   As in the case described above, the opening and closing of the secondary air regulating valves 42A and 42B and the exhaust gas discharge valves 51A and 51B are alternately switched, and the combustion operation and the heat storage operation are performed in the heat storage chambers 20A and 20B. Switch between and alternately.

このようにすると、この実施形態３の燃焼装置Ａ３においても、前記の前記の実施形態１，２の燃焼装置Ａ１，Ａ２と同様に、炉１の内部１ａ温度に対応させて燃焼状態を適切に制御し、低温域から高温域において安定した燃焼性能が得られると共に、高温域におけるＮＯｘの発生も適切に抑制できるようになる。   In this way, also in the combustion apparatus A3 of the third embodiment, the combustion state is appropriately set in accordance with the temperature inside the furnace 1a, similarly to the combustion apparatuses A1 and A2 of the first and second embodiments. By controlling, stable combustion performance can be obtained from the low temperature range to the high temperature range, and generation of NOx in the high temperature range can be appropriately suppressed.

以上のように、本発明では、４つの燃焼状態（予備加熱燃焼状態，第１燃焼状態，第２燃焼状態，第３燃焼状態）が１台の燃焼装置で可能になり、これらを状況に応じて制御することにより、従来の燃焼装置よりも幅広い温度領域で利用できるという、大きな効果を発揮するものである。   As described above, in the present invention, four combustion states (preheated combustion state, first combustion state, second combustion state, and third combustion state) can be performed by one combustion device, and these can be selected according to the situation. By controlling this, it is possible to achieve a great effect that it can be used in a wider temperature range than the conventional combustion device.

１ 炉，１ａ 内部
１１ １次空気案内管
１２ 燃料案内管
１３ １次燃焼室
１４ スタビライザ
１５ スパークプラグ
１６ 第１ノズル部
１７ 予備空気案内管，１７ａ 予備混合部
２０（２０Ａ，２０Ｂ） 蓄熱室
２１（２１Ａ，２１Ｂ） 蓄熱材
２２（２２Ａ，２２Ｂ） ２次空気案内管
２３（２３Ａ，２３Ｂ） 第２ノズル部
２４（２４Ａ，２４Ｂ） 排ガス排出管
３０ 燃料供給装置
３１ 燃料調整弁
４０ 燃焼用空気供給装置
４１ １次空気調整弁（１次空気制御手段）
４２（４２Ａ，４２Ｂ） ２次空気調整弁（２次空気制御手段）
４３ 予備空気供給経路（予備空気供給手段）
４４ 予備空気調整弁（予備空気制御手段）
５０ 排気装置
５１（５１Ａ，５１Ｂ） 排ガス排出弁
Ａ１〜Ａ３ 燃焼装置 DESCRIPTION OF SYMBOLS 1 Furnace, 1a inside 11 Primary air guide pipe 12 Fuel guide pipe 13 Primary combustion chamber 14 Stabilizer 15 Spark plug 16 1st nozzle part 17 Preliminary air guide pipe, 17a Preliminary mixing part 20 (20A, 20B) Thermal storage chamber 21 ( 21A, 21B) Thermal storage material 22 (22A, 22B) Secondary air guide pipe 23 (23A, 23B) Second nozzle part 24 (24A, 24B) Exhaust gas exhaust pipe 30 Fuel supply device 31 Fuel adjustment valve 40 Combustion air supply device 41 Primary air regulating valve (primary air control means)
42 (42A, 42B) Secondary air regulating valve (secondary air control means)
43 Spare air supply path (spare air supply means)
44 Spare air adjustment valve (spare air control means)
50 Exhaust device 51 (51A, 51B) Exhaust gas discharge valve A1-A3 Combustion device

Claims (6)

１次燃焼用空気を案内する１次空気案内管と、この１次空気案内管の内周側に設けられて燃料を案内する燃料案内管と、前記の１次空気案内管によって案内された１次燃焼用空気と燃料案内管によって案内された燃料とを燃焼させる１次燃焼室と、この１次燃焼室と炉の内部とを連通する第１ノズル部と、蓄熱室において加熱された２次燃焼用空気を案内する２次空気案内管と、この２次空気案内管によって案内された２次燃焼用空気を前記の第１ノズル部の近傍において炉の内部に噴出させる第２ノズル部とを有する燃焼装置に、前記の１次空気案内管による１次燃焼用空気の案内を制御する１次空気制御手段と、前記の燃料案内管による燃料の案内を制御する燃料制御手段と、前記の２次空気案内管による２次燃焼用空気の案内を制御する２次空気制御手段とを設け、前記の第１ノズル部を１次燃焼室から炉の内部に向けて収縮させ、前記の１次燃焼室において１次燃焼用空気と燃料とを燃焼させた燃焼排ガスを、前記の第１ノズル部を通して高速で炉の内部に噴出させる燃焼装置を用い、
炉の内部の温度が低い第１温度領域において、前記の１次空気制御手段によって１次空気案内管を通して案内される１次燃焼用空気と、前記の燃料制御手段によって燃料案内管を通して案内される燃料とを、前記の１次燃焼室において燃焼させて、この燃焼排ガスを前記の第１ノズル部を通して高速で炉の内部に噴出させる第１燃焼状態と、
炉の内部の温度が前記の第１温度領域より高くなった第２温度領域において、前記の燃料制御手段によって燃料案内管を通して案内される燃料の量を前記の第１燃焼状態よりも増加させると共に、前記の２次空気制御手段によって前記の２次空気案内管を通して案内される前記の２次燃焼用空気を前記の第２ノズル部から炉の内部に噴出させ、１次空気案内管を通して案内される１次燃焼用空気と燃料案内管を通して案内される燃料とを１次燃焼室において燃焼させて、この燃焼排ガスを前記の第１ノズル部を通して高速で炉の内部に噴出させると共に、炉の内部において、前記の２次燃焼用空気と前記の燃焼排ガスに含まれる未燃焼の燃料とを燃焼させる第２燃焼状態と、
炉の内部の温度が前記の第２温度領域より高くなった第３温度領域において、前記の１次空気制御手段によって１次空気案内管による１次燃焼用空気の案内を停止させると共に、前記の２次空気制御手段によって前記の２次空気案内管を通して前記の第２ノズル部から炉の内部に噴出させる前記の２次燃焼用空気の量を増加させ、前記の燃料制御手段によって燃料案内管を通して案内される燃料の量を増加させた状態で、この燃料を１次燃焼室から前記の第１ノズル部を通して炉の内部に噴出させ、炉の内部において前記の２次燃焼用空気と燃料とを燃焼させる第３燃焼状態と、
に切り換えることを特徴とする燃焼装置の燃焼制御方法。 A primary air guide pipe that guides the primary combustion air, a fuel guide pipe that is provided on the inner peripheral side of the primary air guide pipe and guides the fuel, and 1 guided by the primary air guide pipe A primary combustion chamber for combusting the secondary combustion air and the fuel guided by the fuel guide tube, a first nozzle part communicating the primary combustion chamber and the interior of the furnace, and the secondary heated in the heat storage chamber A secondary air guide pipe for guiding the combustion air, and a second nozzle section for injecting the secondary combustion air guided by the secondary air guide pipe into the furnace in the vicinity of the first nozzle section. a combustion device comprising: a primary air control means for controlling the guidance of the primary combustion air by the primary air guide pipe, the fuel control means for controlling the guidance of the fuel by the fuel guide tube, said 2 Control secondary combustion air guidance by secondary air guide pipe Only set a secondary air control unit, the first nozzle portion of the shrunk toward the primary combustion chamber in the interior of the furnace, to burn the primary combustion air and the fuel in the primary combustion chamber of the Using a combustion device for injecting combustion exhaust gas into the furnace at high speed through the first nozzle part ,
In the first temperature region where the temperature inside the furnace is low, the primary combustion air guided through the primary air guide pipe by the primary air control means and the fuel guide pipe through the fuel guide pipe are guided by the fuel control means. A first combustion state in which fuel is combusted in the primary combustion chamber and the combustion exhaust gas is ejected into the furnace at high speed through the first nozzle portion;
In the second temperature range in which the temperature inside the furnace is higher than the first temperature range, the amount of fuel guided through the fuel guide pipe by the fuel control means is increased from the first combustion state. The secondary combustion air guided through the secondary air guide pipe by the secondary air control means is ejected from the second nozzle portion into the furnace and guided through the primary air guide pipe. The primary combustion air and the fuel guided through the fuel guide pipe are combusted in the primary combustion chamber, and the combustion exhaust gas is ejected into the furnace at a high speed through the first nozzle portion. A second combustion state in which the secondary combustion air and unburned fuel contained in the combustion exhaust gas are burned,
In the third temperature range in which the temperature inside the furnace is higher than the second temperature range, the primary air control means stops guiding the primary combustion air by the primary air guide pipe, and The amount of the secondary combustion air jetted from the second nozzle portion into the furnace through the secondary air guide pipe by the secondary air control means is increased, and the fuel control means passes the fuel guide pipe through the fuel guide pipe. In a state where the amount of fuel to be guided is increased, this fuel is ejected from the primary combustion chamber through the first nozzle portion into the furnace, and the secondary combustion air and fuel are discharged inside the furnace. A third combustion state for burning;
A combustion control method for a combustion apparatus, characterized by switching to 請求項１に記載の燃焼装置の燃焼制御方法において、前記の燃料案内管によって案内される燃料が前記の１次燃焼室に導かれる前に、前記の燃料に予備燃焼用空気を混合させる予備空気供給手段を設けると共に、この予備空気供給手段による予備燃焼用空気の供給を制御する予備空気制御手段を設けたことを特徴とする燃焼装置の燃焼制御方法。 2. The combustion control method for a combustion apparatus according to claim 1, wherein pre-combustion air is mixed with pre-combustion air before the fuel guided by the fuel guide pipe is guided to the primary combustion chamber. 3. A combustion control method for a combustion apparatus , comprising: a supply unit; and a backup air control unit for controlling supply of preliminary combustion air by the backup air supply unit. 請求項２に記載の燃焼装置の燃焼制御方法において、前記の予備空気供給手段は、予備燃焼用空気を前記の燃料案内管に供給して、燃料と予備燃焼用空気とを燃料案内管内で予備混合させることを特徴とする燃焼装置の燃焼制御方法。 3. The combustion control method for a combustion apparatus according to claim 2, wherein the preliminary air supply means supplies preliminary combustion air to the fuel guide pipe so that fuel and preliminary combustion air are reserved in the fuel guide pipe. A combustion control method for a combustion apparatus , comprising mixing. 請求項２に記載の燃焼装置の燃焼制御方法において、前記の予備空気供給手段として、前記の燃料案内管と１次空気案内管との間に予備空気案内管を設け、この予備空気案内管によって案内された予備燃焼用空気を、１次燃焼室に導かれる前に燃料案内管によって案内された燃料と予備混合させることを特徴とする燃焼装置の燃焼制御方法。 3. The combustion control method for a combustion apparatus according to claim 2, wherein a spare air guide pipe is provided between the fuel guide pipe and the primary air guide pipe as the spare air supply means. A combustion control method for a combustion apparatus , wherein the guided preliminary combustion air is premixed with the fuel guided by the fuel guide pipe before being guided to the primary combustion chamber. 請求項２〜請求項４の何れか１項に記載の燃焼装置の燃焼制御方法において、前記の第１燃焼状態の前に、前記の燃料制御手段によって燃料案内管を通して案内される燃料の量を少なくすると共に、前記の予備空気供給手段により、予備燃焼用空気を１次燃焼室に導かれる前の燃料に混合させて予備燃焼させることを特徴とする燃焼装置の燃焼制御方法。 The combustion control method for a combustion apparatus according to any one of claims 2 to 4 , wherein an amount of fuel guided through a fuel guide pipe by the fuel control means is set before the first combustion state. A combustion control method for a combustion apparatus characterized in that the preliminary combustion air is mixed and pre-combusted by mixing the pre-combustion air with the fuel before being introduced into the primary combustion chamber by the preliminary air supply means. 請求項２〜請求項４の何れか１項に記載の燃焼装置の燃焼制御方法において、前記の第２燃焼状態と第３燃焼状態との切り換えだけを行うことを特徴とする燃焼装置の燃焼制御方法。 5. The combustion control method for a combustion apparatus according to claim 2, wherein only the switching between the second combustion state and the third combustion state is performed. Method.
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