WO2017159079A1 - Radiant tube burner equipment - Google Patents

Radiant tube burner equipment Download PDF

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Publication number
WO2017159079A1
WO2017159079A1 PCT/JP2017/003321 JP2017003321W WO2017159079A1 WO 2017159079 A1 WO2017159079 A1 WO 2017159079A1 JP 2017003321 W JP2017003321 W JP 2017003321W WO 2017159079 A1 WO2017159079 A1 WO 2017159079A1
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WO
WIPO (PCT)
Prior art keywords
combustion
exhaust gas
radiant tube
gas
burner
Prior art date
Application number
PCT/JP2017/003321
Other languages
French (fr)
Japanese (ja)
Inventor
健介 川端
寿雄 惠上
毅 有松
Original Assignee
中外炉工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中外炉工業株式会社 filed Critical 中外炉工業株式会社
Priority to KR1020187016355A priority Critical patent/KR102549148B1/en
Priority to CN201780007810.1A priority patent/CN108496040B/en
Publication of WO2017159079A1 publication Critical patent/WO2017159079A1/en

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    • 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
    • F23D14/12—Radiant burners
    • F23D14/126—Radiant burners cooperating with refractory wall surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • 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 
    • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
    • 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 
    • F23C99/00—Subject-matter not provided for in other groups of this subclass
    • 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
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
    • 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
    • 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
    • F23L15/04—Arrangements of recuperators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/10—Nitrogen; Compounds thereof
    • F23J2215/101—Nitrous oxide (N2O)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2219/00—Treatment devices
    • F23J2219/10—Catalytic reduction devices
    • 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

Definitions

  • the present invention supplies fuel gas and combustion air to a combustion burner section at one end of a radiant tube, burns the fuel gas in the radiant tube in the above-mentioned combustion burner section, and burns the combustion exhaust gas after combustion.
  • the present invention relates to a radiant tube burner installation provided with a radiant tube burner for discharging from the other end.
  • the fuel gas and the combustion air are supplied to the combustion burner portion, the fuel gas is burned in the radiant tube, and the combustion exhaust gas after combustion is the other end of the radiant tube
  • the combustion exhaust gas contains harmful nitrogen oxides (hereinafter referred to as "NOx”) and unburned component gas such as CO gas and hydrocarbon gas (HC), etc. Is characterized in that it is prevented from being discharged to the outside.
  • NOx harmful nitrogen oxides
  • HC hydrocarbon gas
  • a radiant tube burner is used to prevent the flame from contacting the object to be heated and causing the object to be oxidized when heating the object to be heated.
  • An equipped radiant tube burner installation is utilized.
  • the fuel gas and the combustion air are supplied to the combustion burner portion at one end of the radiant tube, and the fuel gas and the combustion air are mixed in the combustion burner portion.
  • the fuel gas is burned in the radiant tube and the flue gas after burning is discharged from the other end of the radiant tube.
  • the fuel gas is mixed with the combustion air in the combustion burner section as described above, and the NOx contained in the combustion exhaust gas is reduced in burning the fuel gas in the radiant tube
  • ⁇ actual air amount / theoretical air amount
  • CO gas or hydrocarbons ex. HC
  • Patent Document 1 the combustion exhaust gas from a radiant tube burner is purified using a nitrogen oxide reduction catalyst, and the obtained NOx purification gas has an air ratio of 1.0 or more. It has been proposed to oxidize and remove unburned components using an oxidation catalyst after adding combustion air as described above.
  • Patent Document 1 a first exhaust gas processing unit containing a nitrogen oxide reduction catalyst and a second exhaust gas processing unit containing an oxidation catalyst are provided. It is necessary to supply air between the exhaust gas processing unit and the second exhaust gas processing unit, and there is a problem that the apparatus becomes complicated and becomes large.
  • the present invention supplies fuel gas and combustion air to a combustion burner section at one end of a radiant tube, burns the fuel gas in the radiant tube in the above-mentioned combustion burner section, and burns the combustion exhaust gas after combustion. It is an object of the present invention to solve the above-mentioned problems in a radiant tube burner installation provided with a radiant tube burner for discharging from the other end.
  • the flue gas is discharged from the other end of the radiant tube to the outside
  • the exhaust gases contain harmful NOx and unburned component gases such as CO gas and hydrocarbon (HC) gas in the exhaust gases. It is an issue.
  • the fuel gas and the combustion air are supplied to the combustion burner portion at one end of the radiant tube, and the fuel gas in the combustion burner portion
  • the fuel gas in the combustion burner portion In a radiant tube burner installation equipped with a radiant tube burner for burning the combustion exhaust gas in the radiant tube and discharging the combustion exhaust gas from the other end of the radiant tube, at a position downstream of the emission direction of the exhaust gas in the radiant tube An exhaust gas processing unit containing a three-way catalyst was provided.
  • NOx contained in the combustion exhaust gas is reduced by the unburned component gas contained in the combustion exhaust gas by the three-way catalyst contained in the exhaust gas processing unit.
  • the amount of combustion air to fuel gas is reduced and the air ratio ⁇ is made 1.0 or less in supplying the fuel gas and the combustion air to the combustion burner portion, the amount of NOx generated at the time of combustion becomes As a result, the amount of NOx contained in the combustion exhaust gas decreases, and the NOx contained in the combustion exhaust gas becomes sufficiently reduced by the three-way catalyst by the unburned component gas contained in the combustion exhaust gas.
  • a fuel gas guiding passage for guiding a part of the fuel gas supplied to the combustion burner section to a position upstream of the exhaust gas processing section in the exhaust gas discharge direction
  • control means is provided to control the amount of fuel gas guided through the fuel gas guide path.
  • the amount of fuel gas guided through the fuel gas guide path is controlled in accordance with the amount of nitrogen oxide contained in the combustion exhaust gas.
  • the unburned component gas contained in the combustion exhaust gas discharged from the exhaust gas processing unit is disposed at a position downstream of the exhaust gas processing unit in the discharge direction of the combustion exhaust gas.
  • a post-combustion device is provided to burn. In this way, even if unburned component gas remains in the combustion exhaust gas processed in the exhaust gas processing unit, the unburned component gas is burned by the post-combustion device and oxidized to CO 2 or H 2 O. As a result, the unburned component gas is prevented from being discharged.
  • a heat exchange means for heating the combustion air by the heat of the combustion exhaust gas is provided, and the combustion air heated by the heat exchange means is used as the combustion burner portion. It is preferable to supply it. In this way, the heat of the combustion exhaust gas can be effectively used to perform efficient combustion.
  • the fuel gas and the combustion air are supplied to the combustion burner portion, the fuel gas is burned in the radiant tube, and the combustion exhaust gas is discharged from the other end of the radiant tube.
  • the combustion exhaust gas is led to the exhaust gas processing unit in which the three-way catalyst is accommodated, and harmful NOx in the combustion exhaust gas and unburned component gas consisting of CO gas and hydrocarbon (HC) gas Properly processed.
  • the radiant tube burner installation according to the present invention when the fuel gas is mixed with the combustion air and burned in the radiant tube, NOx and unburned component gas in the combustion exhaust gas are appropriate in the exhaust gas treatment section.
  • the combustion exhaust gas can be properly discharged to the outside in a safe state in which the combustion exhaust gas does not contain NOx and unburned component gas.
  • a U-shaped one is used as the radiant tube 11 in the radiant tube burner 10, and this U-shape is obtained. While the radiant tube 11 is disposed inside the furnace 1, both ends of the radiant tube 11 are extended to the outside of the furnace 1 through the furnace wall 1a.
  • the shape of the radiant tube 11 is not limited to the U-shape, and may be any known shape such as a W-shape or an I-shape.
  • fuel gas such as hydrocarbon (HC) gas is supplied to the combustion burner portion 12 at one end side of the radiant tube 11 through the fuel gas supply pipe 21, and combustion is performed through the combustion air supply pipe 22.
  • Supply air mix the fuel gas and the combustion air in the combustion burner section 12, burn the fuel gas in the radiant tube 11 in the combustion burner section 12, and burn the combustion exhaust gas after the combustion in the radiant tube 11 It is made to discharge from the other end of the fuel gas such as hydrocarbon (HC) gas is supplied to the combustion burner portion 12 at one end side of the radiant tube 11 through the fuel gas supply pipe 21, and combustion is performed through the combustion air supply pipe 22.
  • Supply air mix the fuel gas and the combustion air in the combustion burner section 12, burn the fuel gas in the radiant tube 11 in the combustion burner section 12, and burn the combustion exhaust gas after the combustion in the radiant tube 11 It is made to discharge from the other end of the
  • an exhaust gas processing unit 23 containing a three-way catalyst is provided at the other end of the radiant tube 11 for exhausting the above-mentioned combustion exhaust gas, and the combustion exhaust gas after being burned in the radiant tube 11 Is led to the exhaust gas processing unit 23 for processing.
  • the amount of NOx generated at the time of combustion In order to reduce the amount of combustion air to the fuel gas, for example, the air ratio .mu. Is set to 1.0 or less, and the fuel gas is burned in the combustion burner section 12 described above.
  • the combustion exhaust gas than the exhaust gas processing unit 23 is A post-combustion device 24 is provided at a position downstream in the discharge direction, and if necessary, a post-combustion fuel gas supply pipe 24a for a post-combustion fuel gas and a post-combustion air supply pipe to the post-combustion device 24.
  • the post combustion air is supplied from 24b.
  • the unburned component gas remaining in the combustion exhaust gas discharged from the exhaust gas processing unit 23 is burned in the post-combustion device 24 and the unburned component gas is CO 2 and H 2 O are oxidized and discharged.
  • the unburned component gas is The combustion device 24 burns and is processed, and the unburned component gas can be reliably prevented from being discharged.
  • the post-combustion device 24 is used to burn the unburned component gas remaining in the combustion exhaust gas with a flame, but the post-combustion device 24 is not limited to such a device, such as electric heating
  • the unburned component gas remaining in the combustion exhaust gas can also be burned by
  • combustion air is supplied to the combustion burner unit 12 Thermal air for heating the combustion air by the heat of the combustion exhaust gas in the radiant tube 11 on the exhaust side of the combustion exhaust gas of the radiant tube 11 which guides the combustion exhaust gas to the exhaust gas processing unit 23 instead of the combustion air supply pipe 22
  • An exchange unit (heat exchange means) 25a is provided, and a combustion air guide pipe 25b for guiding combustion air is provided in the heat exchange unit 25a, and the combustion air heated in the heat exchange unit 25a is used as a combustion burner unit
  • a heating / combustion air supply pipe 25c for supplying 12 is provided.
  • the combustion air is guided to the heat exchange unit 25a through the combustion air guide pipe 25b, and the heat exchange unit 25a heats the exhaust gas for combustion in this heat exchange unit 25a.
  • the combustion air is heated by the above-mentioned method, and the combustion air thus heated is supplied to the combustion burner section 12 through the heating / combustion air supply pipe 25c, and the combustion air and fuel gas thus heated are supplied.
  • the combustion air and fuel gas thus heated are supplied.
  • the heat of the combustion exhaust gas can be effectively used. Further, by performing heat exchange between the combustion exhaust gas and the combustion air in the heat exchange unit 25a as described above, the temperature of the combustion exhaust gas led from the radiant tube 11 to the exhaust gas processing unit 23 decreases. The temperature of the exhaust gas for combustion is prevented from becoming a temperature exceeding the temperature range in which the three-way catalyst contained in the exhaust gas processing unit 23 is used, and the exhaust gas for combustion can be appropriately treated by the three-way catalyst.
  • the heat exchange unit 25a is provided in the radiant tube 11. However, the heat exchange unit 25a may be provided outside the radiant tube 11.
  • the fuel gas supply pipe 21 passes through the combustion burner section 12.
  • a fuel gas guiding passage 26 for guiding a part of the fuel gas to be supplied to a position upstream of the exhaust gas processing unit 23 in the discharge direction of the combustion exhaust gas, and the combustion exhaust gas from the exhaust gas processing unit 23 through the fuel gas guiding passage 26
  • a control valve (control means) 26a for controlling the amount of fuel gas guided to the upstream position in the discharge direction.
  • the fuel is controlled by the control valve 26 a in correspondence to the amount of NOx contained in the combustion exhaust gas after being burned in the combustion burner section 12.
  • the amount of fuel gas guided through the gas guiding path 26 is controlled.
  • the amount of combustion air is increased, for example, air
  • the fuel gas is burned in the combustion burner section 12 so that the ratio ⁇ exceeds 1.0
  • the fuel gas is burned by a sufficient amount of combustion air, and CO gas or hydrocarbon in the flue gas is burned.
  • unburned component gas such as (HC) gas decreases, a large amount of NOx is generated at the time of combustion, and a large amount of NOx is contained in the combustion exhaust gas.
  • the control valve 26a causes the fuel gas guide passage 26 to flow upstream of the exhaust gas processing portion 23 in the exhaust gas discharge direction.
  • An appropriate amount of fuel gas is supplied to a position upstream of the exhaust gas processing unit 23 in the discharge direction of the combustion exhaust gas by controlling the amount of fuel gas guided to the position of To the exhaust gas processing unit 23 containing the three-way catalyst.
  • a radiant tube according to the second embodiment As shown in the burner installation, as shown in the radiant tube burner installation according to the third embodiment, a post-combustion device 24 is provided at a position downstream of the exhaust gas processing unit 23 in the discharge direction of the combustion exhaust gas.
  • a heat exchange unit 25a for heating the combustion air by the heat of the combustion exhaust gas is provided in a portion on the exhaust side of the combustion exhaust gas of the radiant tube 11 that guides the combustion exhaust gas to the exhaust gas processing unit 23, and the heat exchange unit 25a is heated
  • a combustion air guide pipe 25b for guiding combustion air is provided, and the heat exchange section 25a is heated. Baked air is provided to heat the combustion air supply pipe 25c for supplying the burner section 12.
  • the combustion air is transferred to the heat exchange unit 25a through the combustion air guide pipe 25b as in the radiant tube burner installation according to the third embodiment.
  • the heat exchange section 25a heats the combustion air with the heat of the combustion exhaust gas, and supplies the thus-heated combustion air to the combustion burner section 12 through the heating / combustion air supply pipe 25c.
  • the heated combustion air and fuel gas are mixed in the combustion burner section 12 so that the fuel gas is burned in the radiant tube 11.
  • the heat of the combustion exhaust gas can be effectively used, and from the radiant tube 11
  • the temperature of the combustion exhaust gas led to the exhaust gas processing unit 23 is lowered, and the temperature of the combustion exhaust gas is prevented from becoming a temperature exceeding the temperature range where the three-way catalyst accommodated in the exhaust gas processing unit 23 is used.
  • the three-way catalyst makes it possible to properly treat the exhaust gas for combustion.
  • the amount of fuel gas guided through the fuel gas guide passage 26 is increased to reduce NOx in the combustion exhaust gas to N 2.
  • the exhaust gas processing unit 23 discharges the combustion exhaust gas in which the unburned component gas remains.
  • the unburned component gas remaining in the combustion exhaust gas discharged from the exhaust gas processing unit 23 is burned in the post-combustion device 24 as in the radiant tube burner installation in the second embodiment.
  • the fuel component gas can be oxidized to CO 2 or H 2 O and discharged.
  • Reactor 1a Reactor wall 10: Radiant tube burner 11: Radiant tube 12: Combustion burner part 21: Fuel gas supply pipe 22: Combustion air supply pipe 23: Exhaust gas processing part 24: Post-combustion device 24a: Fuel for post-combustion Gas supply pipe 24b: Post combustion air supply pipe 25a: Heat exchange section (heat exchange means) 25b: combustion air guide pipe 25c: heating combustion air supply pipe 26: fuel gas guide path 26a: control valve (control means)

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Gas Burners (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Air Supply (AREA)
  • Chimneys And Flues (AREA)

Abstract

Radiant tube burner equipment that comprises a radiant tube burner that supplies a fuel gas and combustion air to a combustion burner part that is at one end part of a radiant tube, combusts the fuel gas inside the radiant tube at the combustion burner part, and discharges combusted combustion exhaust gas from the other end part of the radiant tube. An exhaust gas processing part that houses a three-way catalyst is provided to the radiant tube at a position that is on the downstream side in the discharge direction of the combustion exhaust gas.

Description

ラジアントチューブバーナー設備Radiant tube burner equipment
　本発明は、ラジアントチューブの一端部における燃焼バーナー部に燃料ガスと燃焼用空気とを供給し、前記の燃焼バーナー部において燃料ガスをラジアントチューブ内で燃焼させ、燃焼後の燃焼排ガスをラジアントチューブの他端部から排出させるラジアントチューブバーナーを備えたラジアントチューブバーナー設備に関するものである。特に、前記のようなラジアントチューブバーナー設備において、燃焼バーナー部に燃料ガスと燃焼用空気とを供給して、燃料ガスをラジアントチューブ内で燃焼させ、燃焼後の燃焼排ガスをラジアントチューブの他端部から外部に排出させるにあたり、燃焼排ガス中に有害な窒素酸化物（以下、ＮＯｘという。）や、またＣＯガスや炭化水素ガス（ＨＣ）等の未燃成分ガスが含まれた状態で、燃焼排ガスが外部に排出されるのを防止するようにした点に特徴を有するものである。 The present invention supplies fuel gas and combustion air to a combustion burner section at one end of a radiant tube, burns the fuel gas in the radiant tube in the above-mentioned combustion burner section, and burns the combustion exhaust gas after combustion. The present invention relates to a radiant tube burner installation provided with a radiant tube burner for discharging from the other end. In particular, in the radiant tube burner installation as described above, the fuel gas and the combustion air are supplied to the combustion burner portion, the fuel gas is burned in the radiant tube, and the combustion exhaust gas after combustion is the other end of the radiant tube The combustion exhaust gas contains harmful nitrogen oxides (hereinafter referred to as "NOx") and unburned component gas such as CO gas and hydrocarbon gas (HC), etc. Is characterized in that it is prevented from being discharged to the outside.
　従来から、工業用加熱炉や熱処理炉等においては、被加熱物を加熱させるにあたり、火炎が被加熱物に接触して、被加熱物が酸化されたりするのを防止するため、ラジアントチューブバーナーを備えたラジアントチューブバーナー設備が利用されている。 Conventionally, in industrial heating furnaces, heat treatment furnaces and the like, a radiant tube burner is used to prevent the flame from contacting the object to be heated and causing the object to be oxidized when heating the object to be heated. An equipped radiant tube burner installation is utilized.
　そして、このようなラジアントチューブバーナー設備においては、一般に、ラジアントチューブの一端部における燃焼バーナー部に燃料ガスと燃焼用空気とを供給し、前記の燃焼バーナー部において燃料ガスと燃焼用空気とを混合させて、燃料ガスをラジアントチューブ内で燃焼させ、燃焼後の燃焼排ガスをラジアントチューブの他端部から排出させるようになっている。 In such a radiant tube burner installation, in general, the fuel gas and the combustion air are supplied to the combustion burner portion at one end of the radiant tube, and the fuel gas and the combustion air are mixed in the combustion burner portion. The fuel gas is burned in the radiant tube and the flue gas after burning is discharged from the other end of the radiant tube.
　ここで、前記のラジアントチューブバーナーにおいて、前記のように燃焼バーナー部において燃料ガスを燃焼用空気と混合させて、燃料ガスをラジアントチューブ内において燃焼させるにあたり、燃焼排ガスに含まれるＮＯｘを減量化するために、燃料ガスに対する燃焼用空気の量を少なくし、空気比μ（実際の空気量／理論空気量）を１．０以下にして燃焼を行うと、燃焼排ガス中にＣＯガスや炭化水素（ＨＣ）ガス等の未燃成分ガスが多く残り、この未燃成分ガスがラジアントチューブの他端部から外部に排出されてしまい、安全性や環境の点において問題があった。 Here, in the radiant tube burner described above, the fuel gas is mixed with the combustion air in the combustion burner section as described above, and the NOx contained in the combustion exhaust gas is reduced in burning the fuel gas in the radiant tube In order to reduce the amount of combustion air to fuel gas and to perform combustion with an air ratio μ (actual air amount / theoretical air amount) of 1.0 or less, CO gas or hydrocarbons (ex. HC) A large amount of unburned component gas such as gas remains, and the unburned component gas is discharged from the other end of the radiant tube to the outside, which poses a problem in terms of safety and environment.
　一方、燃料ガスに対する燃焼用空気の量を多くし、空気比μが１．０を超えるようにして燃焼を行うと、燃焼排ガス中に未燃成分ガスが残るのが抑制されるが、燃焼時にＮＯｘが多く発生し、ＮＯｘを多く含む燃焼排ガスがラジアントチューブの他端部から外部に排出されて、環境を大きく害するという問題があった。特に、近年においては、燃焼排ガス中におけるＮＯｘを大幅に低減させることが要望されている。 On the other hand, if the amount of combustion air to fuel gas is increased and combustion is performed with the air ratio μ exceeding 1.0, the unburned component gas remaining in the combustion exhaust gas is suppressed, but at the time of combustion A large amount of NOx is generated, and the combustion exhaust gas containing a large amount of NOx is discharged to the outside from the other end of the radiant tube, resulting in a problem of significantly harming the environment. In particular, in recent years, there has been a demand to significantly reduce NOx in combustion exhaust gas.
　そして、近年においては、特許文献１に示されるように、ラジアントチューブバーナーからの燃焼排ガスを、窒素酸化物還元触媒を用いて浄化し、得られたＮＯｘ浄化ガスに空気比が１．０以上となるように燃焼用空気を添加した後、更に酸化触媒を用いて未燃成分を酸化除去させるようにしたものが提案されている。 And in recent years, as shown in Patent Document 1, the combustion exhaust gas from a radiant tube burner is purified using a nitrogen oxide reduction catalyst, and the obtained NOx purification gas has an air ratio of 1.0 or more. It has been proposed to oxidize and remove unburned components using an oxidation catalyst after adding combustion air as described above.
　ここで、特許文献１に示されるものにおいては、窒素酸化物還元触媒を収容させた第１の排ガス処理部と、酸化触媒を収容させた第２の排ガス処理部とを設けると共に、この第１の排ガス処理部と第２の排ガス処理部との間に空気を供給させることが必要になり、装置が複雑になって大型化する等の問題があった。 Here, in the case shown in Patent Document 1, a first exhaust gas processing unit containing a nitrogen oxide reduction catalyst and a second exhaust gas processing unit containing an oxidation catalyst are provided. It is necessary to supply air between the exhaust gas processing unit and the second exhaust gas processing unit, and there is a problem that the apparatus becomes complicated and becomes large.
　また、排ガス処理の一つとしては、三元触媒によって、安全、環境、人体などに悪影響なＣＯ、ＨＣ、ＮＯｘを酸化、還元し、Ｈ２Ｏ、ＣＯ２、Ｎ２に変化させて浄化するものが知られている。 In addition, as one of the exhaust gas treatment, CO, HC, and NOx which are harmful to safety, environment, human body, etc. are oxidized and reduced by three-way catalyst, converted to H 2 O, CO 2 , N 2 and purified Things are known.
特開２００１－２４１６１９号公報JP 2001-241619 A
　本発明は、ラジアントチューブの一端部における燃焼バーナー部に燃料ガスと燃焼用空気とを供給し、前記の燃焼バーナー部において燃料ガスをラジアントチューブ内で燃焼させ、燃焼後の燃焼排ガスをラジアントチューブの他端部から排出させるラジアントチューブバーナーを備えたラジアントチューブバーナー設備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。 The present invention supplies fuel gas and combustion air to a combustion burner section at one end of a radiant tube, burns the fuel gas in the radiant tube in the above-mentioned combustion burner section, and burns the combustion exhaust gas after combustion. It is an object of the present invention to solve the above-mentioned problems in a radiant tube burner installation provided with a radiant tube burner for discharging from the other end.
　すなわち、本発明におけるラジアントチューブバーナー設備においては、燃料ガスを燃焼バーナー部において燃焼用空気と混合させて、ラジアントチューブ内において燃焼させた後、燃焼排ガスをラジアントチューブの他端部から外部に排出させるにあたり、燃焼排ガス中に有害なＮＯｘや、またＣＯガスや炭化水素（ＨＣ）ガス等の未燃成分ガスが含まれた状態で、燃焼排ガスが外部に排出されるのを適切に防止することを課題とするものである。 That is, in the radiant tube burner installation according to the present invention, after the fuel gas is mixed with the combustion air in the combustion burner portion and burned in the radiant tube, the flue gas is discharged from the other end of the radiant tube to the outside In order to prevent the exhaust gases from being discharged outside properly, the exhaust gases contain harmful NOx and unburned component gases such as CO gas and hydrocarbon (HC) gas in the exhaust gases. It is an issue.
　本発明に係るラジアントチューブバーナー設備においては、前記のような課題を解決するため、ラジアントチューブの一端部における燃焼バーナー部に燃料ガスと燃焼用空気とを供給し、前記の燃焼バーナー部において燃料ガスをラジアントチューブ内で燃焼させ、燃焼後の燃焼排ガスをラジアントチューブの他端部から排出させるラジアントチューブバーナーを備えたラジアントチューブバーナー設備において、前記のラジアントチューブにおける燃焼排ガスの排出方向下流側の位置に、三元触媒を収容させた排ガス処理部を設けるようにした。 In the radiant tube burner installation according to the present invention, in order to solve the problems as described above, the fuel gas and the combustion air are supplied to the combustion burner portion at one end of the radiant tube, and the fuel gas in the combustion burner portion In a radiant tube burner installation equipped with a radiant tube burner for burning the combustion exhaust gas in the radiant tube and discharging the combustion exhaust gas from the other end of the radiant tube, at a position downstream of the emission direction of the exhaust gas in the radiant tube An exhaust gas processing unit containing a three-way catalyst was provided.
　そして、前記のラジアントチューブバーナー設備においては、前記の排ガス処理部に収容させた三元触媒により、燃焼排ガスに含まれるＮＯｘを燃焼排ガスに含まれる未燃成分ガスによって還元させるようにする。この場合、燃焼バーナー部に燃料ガスと燃焼用空気とを供給するにあたり、燃料ガスに対する燃焼用空気の量を少なくして空気比μを１．０以下にすると、燃焼時に発生するＮＯｘの量が少なくなって燃焼排ガスに含まれるＮＯｘが減少し、更に燃焼排ガスに含まれるＮＯｘが前記の三元触媒により燃焼排ガスに含まれる未燃成分ガスによって十分に還元されるようになる。 In the radiant tube burner installation, NOx contained in the combustion exhaust gas is reduced by the unburned component gas contained in the combustion exhaust gas by the three-way catalyst contained in the exhaust gas processing unit. In this case, when the amount of combustion air to fuel gas is reduced and the air ratio μ is made 1.0 or less in supplying the fuel gas and the combustion air to the combustion burner portion, the amount of NOx generated at the time of combustion becomes As a result, the amount of NOx contained in the combustion exhaust gas decreases, and the NOx contained in the combustion exhaust gas becomes sufficiently reduced by the three-way catalyst by the unburned component gas contained in the combustion exhaust gas.
　また、本発明に係るラジアントチューブバーナー設備においては、前記の燃焼バーナー部に供給する燃料ガスの一部を前記の排ガス処理部よりも燃焼排ガスの排出方向上流側の位置に導く燃料ガス案内路と、この燃料ガス案内路を通して案内する燃料ガスの量を制御する制御手段とを設けることが好ましい。 Further, in the radiant tube burner installation according to the present invention, a fuel gas guiding passage for guiding a part of the fuel gas supplied to the combustion burner section to a position upstream of the exhaust gas processing section in the exhaust gas discharge direction Preferably, control means is provided to control the amount of fuel gas guided through the fuel gas guide path.
　ここで、前記の制御手段においては、前記の燃焼排ガスに含まれる窒素酸化物の量に対応させて、燃料ガス案内路を通して案内する燃料ガスの量を制御させるようにする。 Here, in the control means, the amount of fuel gas guided through the fuel gas guide path is controlled in accordance with the amount of nitrogen oxide contained in the combustion exhaust gas.
　そして、前記のように燃焼バーナー部に燃料ガスと燃焼用空気とを供給するにあたり、燃料ガスに対する燃焼用空気の量が多くなった状態で、燃料ガスを前記の燃焼バーナー部において燃焼させた結果、燃焼排ガス中にＮＯｘが多く含まれるようになった場合には、前記の制御手段により燃料ガス案内路を通して前記の三元触媒を収容させた排ガス処理部に導かれる前に適当量の燃料ガスを供給させるようにすることができる。このようにすると、ＮＯｘが多く含まれる燃焼排ガスと適当量の燃料ガスとが一緒になって排ガス処理部に導かれ、前記の三元触媒の作用によって、燃焼排ガス中におけるＮＯｘが十分に還元されて排出されるようになる。 And, as described above, in supplying the fuel gas and the combustion air to the combustion burner portion, the result of burning the fuel gas in the combustion burner portion in a state where the amount of the combustion air to the fuel gas is increased When a large amount of NOx is contained in the combustion exhaust gas, an appropriate amount of fuel gas is introduced before it is led to the exhaust gas processing unit containing the three-way catalyst through the fuel gas guide path by the control means. Can be supplied. In this way, the combustion exhaust gas containing a large amount of NOx and the appropriate amount of fuel gas are brought together to the exhaust gas treatment unit, and the NOx in the combustion exhaust gas is sufficiently reduced by the action of the three-way catalyst. Will be discharged.
　また、本発明に係る前記のラジアントチューブバーナー設備においては、前記の排ガス処理部よりも燃焼排ガスの排出方向下流側の位置に、排ガス処理部から排出される燃焼排ガスに含まれる未燃成分ガスを燃焼させる後燃焼装置を設けることが好ましい。このようにすると、排ガス処理部において処理された燃焼排ガス中に未燃成分ガスが残っていても、この未燃成分ガスが前記の後燃焼装置により燃焼されてＣＯ２やＨ２Ｏに酸化され、未燃成分ガスが排出されるのが防止されるようになる。 In the radiant tube burner installation according to the present invention, the unburned component gas contained in the combustion exhaust gas discharged from the exhaust gas processing unit is disposed at a position downstream of the exhaust gas processing unit in the discharge direction of the combustion exhaust gas. Preferably, a post-combustion device is provided to burn. In this way, even if unburned component gas remains in the combustion exhaust gas processed in the exhaust gas processing unit, the unburned component gas is burned by the post-combustion device and oxidized to CO 2 or H 2 O. As a result, the unburned component gas is prevented from being discharged.
　また、本発明に係るラジアントチューブバーナー設備においては、前記の燃焼排ガスの熱によって燃焼用空気を加熱させる熱交換手段を設け、この熱交換手段によって加熱された燃焼用空気を前記の燃焼バーナー部に供給させるようにすることが好ましい。このようにすると、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ことができるようになる。 In the radiant tube burner installation according to the present invention, a heat exchange means for heating the combustion air by the heat of the combustion exhaust gas is provided, and the combustion air heated by the heat exchange means is used as the combustion burner portion. It is preferable to supply it. In this way, the heat of the combustion exhaust gas can be effectively used to perform efficient combustion.
　本発明におけるラジアントチューブバーナー設備においては、燃焼バーナー部に燃料ガスと燃焼用空気とを供給し、燃料ガスをラジアントチューブ内で燃焼させて、燃焼後の燃焼排ガスをラジアントチューブの他端部から排出させるにあたり、前記のように燃焼排ガスを三元触媒が収容された排ガス処理部に導いて、燃焼排ガス中における有害なＮＯｘや、またＣＯガスや炭化水素（ＨＣ）ガスからなる未燃成分ガスを適切に処理するようにした。 In the radiant tube burner installation according to the present invention, the fuel gas and the combustion air are supplied to the combustion burner portion, the fuel gas is burned in the radiant tube, and the combustion exhaust gas is discharged from the other end of the radiant tube. As described above, the combustion exhaust gas is led to the exhaust gas processing unit in which the three-way catalyst is accommodated, and harmful NOx in the combustion exhaust gas and unburned component gas consisting of CO gas and hydrocarbon (HC) gas Properly processed.
　この結果、本発明におけるラジアントチューブバーナー設備においては、燃料ガスを燃焼用空気と混合させて、ラジアントチューブ内において燃焼させた場合に、燃焼排ガス中におけるＮＯｘや未燃成分ガスが排ガス処理部において適切に処理され、燃焼排ガス中にＮＯｘや未燃成分ガスが含まれない安全な状態で、燃焼排ガスを外部に適切に排出できるようになる。 As a result, in the radiant tube burner installation according to the present invention, when the fuel gas is mixed with the combustion air and burned in the radiant tube, NOx and unburned component gas in the combustion exhaust gas are appropriate in the exhaust gas treatment section. The combustion exhaust gas can be properly discharged to the outside in a safe state in which the combustion exhaust gas does not contain NOx and unburned component gas.
本発明の第１の実施形態に係るラジアントチューブバーナー設備を使用す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 which uses the radiant tube burner installation which concerns on the 1st Embodiment of this invention. 本発明の第２の実施形態に係るラジアントチューブバーナー設備を使用す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 which uses the radiant tube burner installation which concerns on the 2nd Embodiment of this invention. 本発明の第３の実施形態に係るラジアントチューブバーナー設備を使用す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 which uses the radiant tube burner installation which concerns on the 3rd Embodiment of this invention. 本発明の第４の実施形態に係るラジアントチューブバーナー設備を使用す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 which uses the radiant tube burner installation which concerns on the 4th Embodiment of this invention. 本発明の第５の実施形態に係るラジアントチューブバーナー設備を使用す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 which uses the radiant tube burner installation which concerns on the 5th Embodiment of this invention.
　以下、本発明の実施形態に係るラジアントチューブバーナー設備を添付図面に基づいて具体的に説明する。なお、本発明に係るラジアントチューブバーナー設備は、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 radiant tube burner installation concerning an embodiment of the present invention is concretely explained based on an accompanying drawing. In addition, the radiant tube burner installation which concerns on this invention is not limited to what was shown to the following embodiment, In the range which does not change the summary of invention, it can change suitably and can implement.
　ここで、第１の実施形態に係るラジアントチューブバーナー設備においては、図１に示すように、ラジアントチューブバーナー１０におけるラジアントチューブ１１としてＵ字型に形成されたものを用い、このＵ字型になったラジアントチューブ１１を炉１の内部に配置させる一方、このラジアントチューブ１１の両端部を、炉壁１ａを通して炉１の外部に延出させるようにしている。なお、ラジアントチューブ１１の形状はＵ字型に限られず、Ｗ字型やＩ字型等の公知のどのような形状のものであってもよい。 Here, in the radiant tube burner installation according to the first embodiment, as shown in FIG. 1, a U-shaped one is used as the radiant tube 11 in the radiant tube burner 10, and this U-shape is obtained. While the radiant tube 11 is disposed inside the furnace 1, both ends of the radiant tube 11 are extended to the outside of the furnace 1 through the furnace wall 1a. The shape of the radiant tube 11 is not limited to the U-shape, and may be any known shape such as a W-shape or an I-shape.
　そして、この実施形態においては、ラジアントチューブ１１の一端側における燃焼バーナー部１２に、燃料ガス供給管２１を通して炭化水素（ＨＣ）ガス等の燃料ガスを供給すると共に、燃焼用空気供給管２２を通して燃焼用空気を供給し、この燃焼バーナー部１２において燃料ガスと燃焼用空気とを混合させて、この燃焼バーナー部１２において燃料ガスをラジアントチューブ１１内で燃焼させ、燃焼後の燃焼排ガスをラジアントチューブ１１の他端部から排出させるようにしている。 In this embodiment, fuel gas such as hydrocarbon (HC) gas is supplied to the combustion burner portion 12 at one end side of the radiant tube 11 through the fuel gas supply pipe 21, and combustion is performed through the combustion air supply pipe 22. Supply air, mix the fuel gas and the combustion air in the combustion burner section 12, burn the fuel gas in the radiant tube 11 in the combustion burner section 12, and burn the combustion exhaust gas after the combustion in the radiant tube 11 It is made to discharge from the other end of the
　また、この実施形態においては、前記の燃焼排ガスを排出させるラジアントチューブ１１の他端部に、三元触媒を収容させた排ガス処理部２３を設け、ラジアントチューブ１１内で燃焼させた後の燃焼排ガスをこの排ガス処理部２３に導いて処理するようにしている。 Further, in this embodiment, an exhaust gas processing unit 23 containing a three-way catalyst is provided at the other end of the radiant tube 11 for exhausting the above-mentioned combustion exhaust gas, and the combustion exhaust gas after being burned in the radiant tube 11 Is led to the exhaust gas processing unit 23 for processing.
　ここで、このラジアントチューブバーナー設備において、前記の燃料ガス供給管２１と燃焼用空気供給管２２とを通して燃焼バーナー部１２に燃料ガスと燃焼用空気とを供給するにあたり、燃焼時に発生するＮＯｘの量を少なくするため、燃料ガスに対する燃焼用空気の量を少なくし、例えば、空気比μを１．０以下して、前記の燃焼バーナー部１２において燃料ガスを燃焼させるようにする。 Here, in the radiant tube burner installation, when supplying the fuel gas and the combustion air to the combustion burner unit 12 through the fuel gas supply pipe 21 and the combustion air supply pipe 22, the amount of NOx generated at the time of combustion In order to reduce the amount of combustion air to the fuel gas, for example, the air ratio .mu. Is set to 1.0 or less, and the fuel gas is burned in the combustion burner section 12 described above.
　このように燃料ガスに対する燃焼用空気の量を少なくして燃焼させると、燃焼排ガスに含まれるＮＯｘが減少すると共に、この燃焼排ガス中にＣＯガスや炭化水素（ＨＣ）ガス等の未燃成分ガスが残るようになる。 When the amount of combustion air relative to the fuel gas is reduced as described above, NOx contained in the combustion exhaust gas is reduced, and unburned component gas such as CO gas or hydrocarbon (HC) gas is contained in the combustion exhaust gas. Will remain.
　そして、このようにＮＯｘと未燃成分ガスとが残った燃焼排ガスを、ラジアントチューブ１１における燃焼排ガスの排出方向下流側に設けられた前記の排ガス処理部２３に導くと、この排ガス処理部２３に収容された三元触媒により、燃焼排ガスに残ったＮＯｘと未燃成分ガスとが反応して、ＮＯｘがＮ２に還元されると共に、未燃成分ガスがＣＯ２やＨ２Ｏに酸化された状態で排出されるようになる。 Then, when the combustion exhaust gas in which the NOx and the unburned component gas remain is guided to the exhaust gas processing unit 23 provided on the downstream side of the emission direction of the combustion exhaust gas in the radiant tube 11, to the exhaust gas processing unit 23 By the housed three-way catalyst, the NOx remaining in the combustion exhaust gas and the unburned component gas react, NOx is reduced to N 2 , and the unburned component gas is oxidized to CO 2 and H 2 O It will be discharged in the state.
　ここで、このようにＮＯｘと未燃成分ガスとが残った燃焼排ガスを排ガス処理部２３に収容された三元触媒によって処理するようにした場合において、燃料ガスに対する燃焼用空気の量が少なくなって、燃焼排ガス中における未燃成分ガスが多くなって、排ガス処理部２３に収容された三元触媒によって十分に処理されず、排ガス処理部２３から未燃成分ガスが残った燃焼排ガスが排出されるおそれがある。 Here, when the combustion exhaust gas in which the NOx and the unburned component gas remain is treated by the three-way catalyst contained in the exhaust gas processing unit 23, the amount of combustion air for the fuel gas is reduced. As a result, the amount of unburned component gas in the combustion exhaust gas is not sufficiently treated by the three-way catalyst contained in the exhaust gas processing unit 23, and the exhaust gas from the exhaust gas processing unit 23 is exhausted. There is a risk of
　このため、第２の実施形態に係るラジアントチューブバーナー設備においては、図２に示すように、前記の第１の実施形態に係るラジアントチューブバーナー設備において、前記の排ガス処理部２３よりも燃焼排ガスの排出方向下流側の位置に後燃焼装置２４を設け、この後燃焼装置２４に対して、必要に応じて、後燃焼用燃料ガス供給管２４ａから後燃焼用燃料ガスと、後燃焼用空気供給管２４ｂから後燃焼用空気とを供給するようにしている。 For this reason, in the radiant tube burner installation according to the second embodiment, as shown in FIG. 2, in the radiant tube burner installation according to the first embodiment, the combustion exhaust gas than the exhaust gas processing unit 23 is A post-combustion device 24 is provided at a position downstream in the discharge direction, and if necessary, a post-combustion fuel gas supply pipe 24a for a post-combustion fuel gas and a post-combustion air supply pipe to the post-combustion device 24. The post combustion air is supplied from 24b.
　そして、この第２の実施形態におけるラジアントチューブバーナー設備においては、排ガス処理部２３から排出された燃焼排ガスに残った未燃成分ガスを前記の後燃焼装置２４において燃焼させ、未燃成分ガスをＣＯ２やＨ２Ｏに酸化させて排出させるようにしている。 Then, in the radiant tube burner installation according to the second embodiment, the unburned component gas remaining in the combustion exhaust gas discharged from the exhaust gas processing unit 23 is burned in the post-combustion device 24 and the unburned component gas is CO 2 and H 2 O are oxidized and discharged.
　このため、前記の排ガス処理部２３において未燃成分ガスが十分に処理されずに、未燃成分ガスが残った燃焼排ガスが排ガス処理部２３から排出されたとしても、この未燃成分ガスが後燃焼装置２４において燃焼されて処理されるようになり、未燃成分ガスが排出されるのを確実に防止できるようになる。なお、この実施形態においては、燃焼排ガスに残った未燃成分ガスを火炎によって燃焼させる後燃焼装置２４を用いるようにしたが、後燃焼装置２４はこのようなものに限定されず、電気加熱等によって燃焼排ガスに残った未燃成分ガスを燃焼させることもできる。 Therefore, even if the combustion exhaust gas containing the unburned component gas is discharged from the exhaust gas processing unit 23 without sufficiently processing the unburned component gas in the exhaust gas processing unit 23, the unburned component gas is The combustion device 24 burns and is processed, and the unburned component gas can be reliably prevented from being discharged. In this embodiment, the post-combustion device 24 is used to burn the unburned component gas remaining in the combustion exhaust gas with a flame, but the post-combustion device 24 is not limited to such a device, such as electric heating The unburned component gas remaining in the combustion exhaust gas can also be burned by
　次に、第３の実施形態に係るラジアントチューブバーナー設備においては、図３に示すように、前記の第１の実施形態に係るラジアントチューブバーナー設備において、燃焼バーナー部１２に燃焼用空気を供給する燃焼用空気供給管２２に代えて、燃焼排ガスを前記の排ガス処理部２３に導くラジアントチューブ１１の燃焼排ガスの排出側におけるラジアントチューブ１１内に、燃焼用排ガスの熱によって燃焼用空気を加熱させる熱交換部（熱交換手段）２５ａを設け、この熱交換部２５ａに燃焼用空気を案内する燃焼用空気案内管２５ｂを設けると共に、前記の熱交換部２５ａにおいて加熱された燃焼用空気を燃焼バーナー部１２に供給する加熱燃焼用空気供給管２５ｃを設けている。 Next, in the radiant tube burner installation according to the third embodiment, as shown in FIG. 3, in the radiant tube burner installation according to the first embodiment, combustion air is supplied to the combustion burner unit 12 Thermal air for heating the combustion air by the heat of the combustion exhaust gas in the radiant tube 11 on the exhaust side of the combustion exhaust gas of the radiant tube 11 which guides the combustion exhaust gas to the exhaust gas processing unit 23 instead of the combustion air supply pipe 22 An exchange unit (heat exchange means) 25a is provided, and a combustion air guide pipe 25b for guiding combustion air is provided in the heat exchange unit 25a, and the combustion air heated in the heat exchange unit 25a is used as a combustion burner unit A heating / combustion air supply pipe 25c for supplying 12 is provided.
　そして、この第３の実施形態に係るラジアントチューブバーナー設備においては、前記のように燃焼用空気案内管２５ｂを通して燃焼用空気を熱交換部２５ａに導き、この熱交換部２５ａにおいて燃焼用排ガスの熱によって燃焼用空気を加熱させ、このように加熱された燃焼用空気を、前記の加熱燃焼用空気供給管２５ｃを通して燃焼バーナー部１２に供給し、このように加熱された燃焼用空気と燃料ガスとを燃焼バーナー部１２において混合させて、燃料ガスをラジアントチューブ１１内で燃焼させるようにする。 Then, in the radiant tube burner installation according to the third embodiment, as described above, the combustion air is guided to the heat exchange unit 25a through the combustion air guide pipe 25b, and the heat exchange unit 25a heats the exhaust gas for combustion in this heat exchange unit 25a. The combustion air is heated by the above-mentioned method, and the combustion air thus heated is supplied to the combustion burner section 12 through the heating / combustion air supply pipe 25c, and the combustion air and fuel gas thus heated are supplied. Are mixed in the combustion burner section 12 so that the fuel gas is burned in the radiant tube 11.
　このようにすると、燃料ガスを燃焼用空気と混合させて燃焼させる際に、燃焼用排ガスの熱を有効に利用することができるようになる。また、このように熱交換部２５ａにおいて燃焼用排ガスと燃焼用空気との間で熱交換を行うことにより、ラジアントチューブ１１から前記の排ガス処理部２３に導かれる燃焼用排ガスの温度が低下し、燃焼用排ガスの温度が、排ガス処理部２３に収容させた三元触媒を使用する温度領域を超えた温度になるのが防止され、三元触媒によって燃焼用排ガスを適切に処理できるようになる。なお、この実施形態においては、熱交換部２５ａをラジアントチューブ１１内に設けるようにしたが、熱交換部２５ａをラジアントチューブ１１の外部に設けるようにすることも可能である。 In this way, when the fuel gas is mixed with the combustion air and burned, the heat of the combustion exhaust gas can be effectively used. Further, by performing heat exchange between the combustion exhaust gas and the combustion air in the heat exchange unit 25a as described above, the temperature of the combustion exhaust gas led from the radiant tube 11 to the exhaust gas processing unit 23 decreases. The temperature of the exhaust gas for combustion is prevented from becoming a temperature exceeding the temperature range in which the three-way catalyst contained in the exhaust gas processing unit 23 is used, and the exhaust gas for combustion can be appropriately treated by the three-way catalyst. In this embodiment, the heat exchange unit 25a is provided in the radiant tube 11. However, the heat exchange unit 25a may be provided outside the radiant tube 11.
　次に、第４の実施形態に係るラジアントチューブバーナー設備においては、図４に示すように、前記の第１の実施形態に係るラジアントチューブバーナー設備において、燃料ガス供給管２１を通して燃焼バーナー部１２に供給する燃料ガスの一部を、前記の排ガス処理部２３よりも燃焼排ガスの排出方向上流側の位置に導く燃料ガス案内路２６と、この燃料ガス案内路２６を通して排ガス処理部２３よりも燃焼排ガスの排出方向上流側の位置に案内する燃料ガスの量を制御する制御弁（制御手段）２６ａとを設けている。 Next, in the radiant tube burner installation according to the fourth embodiment, as shown in FIG. 4, in the radiant tube burner installation according to the first embodiment, the fuel gas supply pipe 21 passes through the combustion burner section 12. A fuel gas guiding passage 26 for guiding a part of the fuel gas to be supplied to a position upstream of the exhaust gas processing unit 23 in the discharge direction of the combustion exhaust gas, and the combustion exhaust gas from the exhaust gas processing unit 23 through the fuel gas guiding passage 26 And a control valve (control means) 26a for controlling the amount of fuel gas guided to the upstream position in the discharge direction.
　そして、この第４の実施形態に係るラジアントチューブバーナー設備においては、前記の燃焼バーナー部１２において燃焼された後の燃焼排ガスに含まれるＮＯｘの量に対応させて、前記の制御弁２６ａにより、燃料ガス案内路２６を通して案内する燃料ガスの量を制御するようにしている。 Then, in the radiant tube burner installation according to the fourth embodiment, the fuel is controlled by the control valve 26 a in correspondence to the amount of NOx contained in the combustion exhaust gas after being burned in the combustion burner section 12. The amount of fuel gas guided through the gas guiding path 26 is controlled.
　ここで、前記の燃料ガス供給管２１と燃焼用空気供給管２２とを通して燃焼バーナー部１２に供給する燃料ガスと燃焼用空気とを供給するにあたり、燃焼用空気の量を多くし、例えば、空気比μが１．０を超えるようにして、燃料ガスを前記の燃焼バーナー部１２において燃焼させた場合、十分な量の燃焼用空気によって燃料ガスが燃焼され、燃焼排ガス中におけるＣＯガスや炭化水素（ＨＣ）ガス等の未燃成分ガスが減少する一方、燃焼時にＮＯｘが多く発生して、燃焼排ガス中にＮＯｘが多く含まれるようになる。 Here, when the fuel gas and combustion air to be supplied to the combustion burner portion 12 through the fuel gas supply pipe 21 and the combustion air supply pipe 22 are supplied, the amount of combustion air is increased, for example, air When the fuel gas is burned in the combustion burner section 12 so that the ratio μ exceeds 1.0, the fuel gas is burned by a sufficient amount of combustion air, and CO gas or hydrocarbon in the flue gas is burned. While unburned component gas such as (HC) gas decreases, a large amount of NOx is generated at the time of combustion, and a large amount of NOx is contained in the combustion exhaust gas.
　そして、このように燃焼排ガス中にＮＯｘが多く含まれるようになった場合には、前記の制御弁２６ａにより、前記の燃料ガス案内路２６を通して排ガス処理部２３よりも燃焼排ガスの排出方向上流側の位置に案内する燃料ガスの量を制御して、適当量の燃料ガスを排ガス処理部２３よりも燃焼排ガスの排出方向上流側の位置に供給し、前記のＮＯｘが多く含まれる燃焼排ガスと一緒にして、三元触媒を収容させた排ガス処理部２３に導くようにする。このようにすると、排ガス処理部２３に収容された三元触媒の作用によって、燃焼排ガス中におけるＮＯｘが燃料ガスと反応して、ＮＯｘがＮ２に還元されると共に、燃料ガスがＣＯ２やＨ２Ｏに酸化された状態で排出されるようになる。 When the combustion exhaust gas contains a large amount of NOx, the control valve 26a causes the fuel gas guide passage 26 to flow upstream of the exhaust gas processing portion 23 in the exhaust gas discharge direction. An appropriate amount of fuel gas is supplied to a position upstream of the exhaust gas processing unit 23 in the discharge direction of the combustion exhaust gas by controlling the amount of fuel gas guided to the position of To the exhaust gas processing unit 23 containing the three-way catalyst. In this way, by the action of the three-way catalyst housed in the exhaust gas treatment unit 23, and NOx in the flue gas reacts with the fuel gas, the NOx is reduced to N 2, the fuel gas is CO 2 and H It will be discharged in the state oxidized to 2 O.
　次に、第５の実施形態に係るラジアントチューブバーナー設備においては、図５に示すように、前記の第４の実施形態に係るラジアントチューブバーナー設備において、前記の第２の実施形態に係るラジアントチューブバーナー設備に示すように、前記の排ガス処理部２３よりも燃焼排ガスの排出方向下流側の位置に後燃焼装置２４を設けると共に、前記の第３の実施形態に係るラジアントチューブバーナー設備に示すように、燃焼排ガスを排ガス処理部２３に導くラジアントチューブ１１の燃焼排ガスの排出側の部分に、燃焼用排ガスの熱によって燃焼用空気を加熱させる熱交換部２５ａを設け、この熱交換部２５ａに加熱させる燃焼用空気を案内する燃焼用空気案内管２５ｂを設けると共に、前記の熱交換部２５ａにおいて加熱された燃焼用空気を燃焼バーナー部１２に供給する加熱燃焼用空気供給管２５ｃを設けている。 Next, in the radiant tube burner installation according to the fifth embodiment, as shown in FIG. 5, in the radiant tube burner installation according to the fourth embodiment, a radiant tube according to the second embodiment. As shown in the burner installation, as shown in the radiant tube burner installation according to the third embodiment, a post-combustion device 24 is provided at a position downstream of the exhaust gas processing unit 23 in the discharge direction of the combustion exhaust gas. A heat exchange unit 25a for heating the combustion air by the heat of the combustion exhaust gas is provided in a portion on the exhaust side of the combustion exhaust gas of the radiant tube 11 that guides the combustion exhaust gas to the exhaust gas processing unit 23, and the heat exchange unit 25a is heated A combustion air guide pipe 25b for guiding combustion air is provided, and the heat exchange section 25a is heated. Baked air is provided to heat the combustion air supply pipe 25c for supplying the burner section 12.
　そして、この第５の実施形態に係るラジアントチューブバーナー設備においては、前記の第３の実施形態に係るラジアントチューブバーナー設備と同様に、燃焼用空気案内管２５ｂを通して燃焼用空気を熱交換部２５ａに導き、この熱交換部２５ａにおいて燃焼用排ガスの熱によって燃焼用空気を加熱させ、このように加熱された燃焼用空気を、前記の加熱燃焼用空気供給管２５ｃを通して燃焼バーナー部１２に供給し、加熱された燃焼用空気と燃料ガスとを燃焼バーナー部１２において混合させて、燃料ガスをラジアントチューブ１１内で燃焼させるようにする。 And, in the radiant tube burner installation according to the fifth embodiment, the combustion air is transferred to the heat exchange unit 25a through the combustion air guide pipe 25b as in the radiant tube burner installation according to the third embodiment. The heat exchange section 25a heats the combustion air with the heat of the combustion exhaust gas, and supplies the thus-heated combustion air to the combustion burner section 12 through the heating / combustion air supply pipe 25c. The heated combustion air and fuel gas are mixed in the combustion burner section 12 so that the fuel gas is burned in the radiant tube 11.
　このようにすると、前記のように燃料ガスを燃焼用空気と燃料ガスとを混合させて燃焼させる際に、燃焼用排ガスの熱を有効に利用することができるようになると共に、ラジアントチューブ１１から排ガス処理部２３に導かれる燃焼用排ガスの温度が低下し、燃焼用排ガスの温度が、排ガス処理部２３に収容させた三元触媒を使用する温度領域を超えた温度になるのが防止され、三元触媒によって燃焼用排ガスを適切に処理できるようになる。 In this way, when the fuel gas is mixed with the combustion air and the fuel gas and burned as described above, the heat of the combustion exhaust gas can be effectively used, and from the radiant tube 11 The temperature of the combustion exhaust gas led to the exhaust gas processing unit 23 is lowered, and the temperature of the combustion exhaust gas is prevented from becoming a temperature exceeding the temperature range where the three-way catalyst accommodated in the exhaust gas processing unit 23 is used. The three-way catalyst makes it possible to properly treat the exhaust gas for combustion.
　また、この第５の実施形態に係るラジアントチューブバーナー設備において、前記の燃料ガス案内路２６を通して案内される燃料ガスの量が多くなって、燃焼排ガス中におけるＮＯｘをＮ２に還元させるのに必要とされる量よりも多くの燃料ガスが排ガス処理部２３に導かれるようになると、排ガス処理部２３から未燃成分ガスが残った燃焼排ガスが排出されるようになる。このような場合には、前記の第２の実施形態におけるラジアントチューブバーナー設備と同様に、排ガス処理部２３から排出された燃焼排ガスに残った未燃成分ガスを後燃焼装置２４において燃焼させ、未燃成分ガスをＣＯ２やＨ２Ｏに酸化させて排出させるようにすることができる。 Further, in the radiant tube burner installation according to the fifth embodiment, the amount of fuel gas guided through the fuel gas guide passage 26 is increased to reduce NOx in the combustion exhaust gas to N 2. When a larger amount of fuel gas is introduced to the exhaust gas processing unit 23 than the amount to be used, the exhaust gas processing unit 23 discharges the combustion exhaust gas in which the unburned component gas remains. In such a case, the unburned component gas remaining in the combustion exhaust gas discharged from the exhaust gas processing unit 23 is burned in the post-combustion device 24 as in the radiant tube burner installation in the second embodiment. The fuel component gas can be oxidized to CO 2 or H 2 O and discharged.
１　　　：炉
１ａ　　：炉壁
１０　　：ラジアントチューブバーナー
１１　　：ラジアントチューブ
１２　　：燃焼バーナー部
２１　　：燃料ガス供給管
２２　　：燃焼用空気供給管
２３　　：排ガス処理部
２４　　：後燃焼装置
２４ａ　：後燃焼用燃料ガス供給管
２４ｂ　：後燃焼用空気供給管
２５ａ　：熱交換部（熱交換手段）
２５ｂ　：燃焼用空気案内管
２５ｃ　：加熱燃焼用空気供給管
２６　　：燃料ガス案内路
２６ａ　：制御弁（制御手段） DESCRIPTION OF SYMBOLS 1: Reactor 1a: Reactor wall 10: Radiant tube burner 11: Radiant tube 12: Combustion burner part 21: Fuel gas supply pipe 22: Combustion air supply pipe 23: Exhaust gas processing part 24: Post-combustion device 24a: Fuel for post-combustion Gas supply pipe 24b: Post combustion air supply pipe 25a: Heat exchange section (heat exchange means)
25b: combustion air guide pipe 25c: heating combustion air supply pipe 26: fuel gas guide path 26a: control valve (control means)

Claims (6)

  1. 　ラジアントチューブの一端部における燃焼バーナー部に燃料ガスと燃焼用空気とを供給し、前記の燃焼バーナー部において燃料ガスをラジアントチューブ内で燃焼させ、燃焼後の燃焼排ガスをラジアントチューブの他端部から排出させるラジアントチューブバーナーを備えたラジアントチューブバーナー設備において、前記のラジアントチューブにおける燃焼排ガスの排出方向下流側の位置に、三元触媒を収容させた排ガス処理部を設けたことを特徴とするラジアントチューブバーナー設備。 The fuel gas and the combustion air are supplied to the combustion burner section at one end of the radiant tube, and the fuel gas is burned in the radiant tube in the above-mentioned combustion burner section, and the combustion exhaust gas from the other end of the radiant tube is burned. A radiant tube burner installation having a radiant tube burner for exhausting, characterized in that an exhaust gas processing unit containing a three-way catalyst is provided at a position on the downstream side of the emission direction of combustion exhaust gas in the radiant tube. Burner equipment.
  2. 　請求項１に記載のラジアントチューブバーナー設備において、前記の排ガス処理部に収容させた三元触媒により、燃焼排ガスに含まれる窒素酸化物を燃焼排ガスに含まれる未燃成分ガスによって還元させることを特徴とするラジアントチューブバーナー設備。 The radiant tube burner installation according to claim 1, characterized in that nitrogen oxides contained in the combustion exhaust gas are reduced by the unburned component gas contained in the combustion exhaust gas by the three-way catalyst accommodated in the exhaust gas processing unit. With radiant tube burner equipment.
  3. 　請求項１に記載のラジアントチューブバーナー設備において、前記の燃焼バーナー部に供給する燃料ガスの一部を前記の排ガス処理部よりも燃焼排ガスの排出方向上流側の位置に導く燃料ガス案内路と、この燃料ガス案内路を通して案内する燃料ガスの量を制御する制御手段とを設けたことを特徴とするラジアントチューブバーナー設備。 2. The radiant tube burner installation according to claim 1, wherein a fuel gas guiding passage for guiding a part of the fuel gas supplied to the combustion burner section to a position upstream of the exhaust gas processing section in the exhaust gas discharge direction; And a control means for controlling an amount of fuel gas guided through the fuel gas guide path.
  4. 　請求項３に記載のラジアントチューブバーナー設備において、前記の燃焼排ガスに含まれる窒素酸化物の量に対応させて、前記の制御手段により燃料ガス案内路を通して案内する燃料ガスの量を制御することを特徴とするラジアントチューブバーナー設備。 4. The radiant tube burner installation according to claim 3, wherein the control means controls the amount of fuel gas guided through the fuel gas guide path in accordance with the amount of nitrogen oxides contained in the combustion exhaust gas. Featuring radiant tube burner equipment.
  5. 　請求項１～請求項４の何れか１項に記載のラジアントチューブバーナー設備において、前記の排ガス処理部よりも燃焼排ガスの排出方向下流側の位置に、排ガス処理部から排出される燃焼排ガスに含まれる未燃成分ガスを燃焼させる後燃焼装置を設けたことを特徴とするラジアントチューブバーナー設備。 The radiant tube burner installation according to any one of claims 1 to 4, wherein the combustion exhaust gas discharged from the exhaust gas processing unit is included at a position downstream of the exhaust gas processing unit in the discharge direction of the combustion exhaust gas. A radiant tube burner installation comprising a post-combustion device for burning unburned component gas to be
  6. 　請求項１～請求項５の何れか１項に記載のラジアントチューブバーナー設備において、前記の燃焼排ガスの熱によって燃焼用空気を加熱させる熱交換手段を設け、この熱交換手段によって加熱された燃焼用空気を前記の燃焼バーナー部に供給させることを特徴とするラジアントチューブバーナー設備。 In the radiant tube burner installation according to any one of claims 1 to 5, heat exchange means for heating the combustion air by the heat of the combustion exhaust gas is provided, and the combustion heated by the heat exchange means is provided. A radiant tube burner installation characterized in that air is supplied to the combustion burner section.
PCT/JP2017/003321 2016-03-15 2017-01-31 Radiant tube burner equipment WO2017159079A1 (en)

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CN108496040B (en) 2020-05-26

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