WO2018008206A1 - Four industriel - Google Patents

Four industriel Download PDF

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Publication number
WO2018008206A1
WO2018008206A1 PCT/JP2017/012325 JP2017012325W WO2018008206A1 WO 2018008206 A1 WO2018008206 A1 WO 2018008206A1 JP 2017012325 W JP2017012325 W JP 2017012325W WO 2018008206 A1 WO2018008206 A1 WO 2018008206A1
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WO
WIPO (PCT)
Prior art keywords
combustion
exhaust gas
gas
processing unit
heat exchange
Prior art date
Application number
PCT/JP2017/012325
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English (en)
Japanese (ja)
Inventor
健介 川端
毅 有松
寿雄 惠上
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 KR1020187018442A priority Critical patent/KR102339526B1/ko
Priority to CN201780010825.3A priority patent/CN108700293B/zh
Publication of WO2018008206A1 publication Critical patent/WO2018008206A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • 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 
    • 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 relates to an industrial furnace which supplies a fuel gas and combustion air to a combustion burner, burns the fuel gas in the furnace by the combustion burner, and discharges the combustion exhaust gas from the furnace through the exhaust pipe. It is a thing.
  • NOx nitrogen oxides harmful to the combustion exhaust gas
  • HC unburned component gases
  • a fuel gas and a combustion air are supplied to a combustion burner to heat the object to be treated, and the fuel gas is heated by the combustion burner.
  • the combustion exhaust gas is burned from the inside of the furnace through the exhaust pipe.
  • Patent Document 1 the combustion exhaust gas from a radiant tube burner is purified using a nitrogen oxide reduction catalyst, and the air ratio ⁇ (the actual amount of air) to the obtained NOx purification gas It has been proposed that after combustion air is added so that (theoretical air amount) becomes 1.0 or more, an oxidation catalyst is further used to oxidize and remove unburned components.
  • 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.
  • patent document 2 was limited in the kind and operating condition of a furnace to be used, and it was difficult to use it under various conditions in various furnaces.
  • the fuel gas and the combustion air are supplied to the combustion burner, the fuel gas is burned in the furnace by the combustion burner, and the combustion exhaust gas is discharged from the furnace through the exhaust pipe. It is an object of the present invention to solve the above-mentioned problems in an industrial furnace.
  • the combustion exhaust gas is discharged from the furnace through the exhaust pipe.
  • exhaust gas is properly prevented from being discharged outside in the state that harmful NOx is contained in the exhaust gas and unburned component gas such as CO gas and hydrocarbon (HC) gas is contained.
  • unburned component gas such as CO gas and hydrocarbon (HC) gas is contained.
  • the heat of the combustion exhaust gas is effectively used.
  • the fuel gas and the combustion air are supplied to the combustion burner, and the fuel gas is burned in the furnace by the combustion burner
  • an exhaust gas processing unit containing a three-way catalyst is provided in the exhaust pipe, and the exhaust gas discharge direction upstream of the exhaust gas processing unit.
  • the first heat exchange means for heating the combustion air supplied to the combustion burner by the heat of the combustion exhaust gas is provided at the position of (2), and the exhaust gas processing section is further downstream of the exhaust gas processing section in the exhaust gas discharge direction.
  • a second heat exchange means is provided for heating the combustion air supplied to the combustion burner by the heat of the flue gas led from.
  • 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 air ratio ⁇ of the combustion air is made 1.0 or less by reducing the amount of the combustion air to the fuel gas, NOx generated at the time of combustion
  • the amount of NOx decreases and the NOx contained in the combustion exhaust gas decreases, and the NOx contained in the combustion exhaust gas is sufficiently reduced by the three-way catalyst by the unburned component gas contained in the combustion exhaust gas.
  • the combustion air supplied to the combustion burner is heated by the heat of the combustion exhaust gas.
  • the combustion air supplied to the combustion burner is heated by the heat of the combustion exhaust gas in the second heat exchange means provided at a position downstream of the exhaust gas processing unit in the exhaust gas discharge direction.
  • the combustion air heated in the second heat exchange means is led to the first heat exchange means, and in the first heat exchange means, it is conducted from the second heat exchange means.
  • the heated and heated combustion air can be further heated by the heat of the flue gas and supplied to the combustion burner.
  • a fuel gas guiding path for guiding the fuel gas to a position upstream of the exhaust gas processing unit in the exhaust gas discharge direction and an amount of the fuel gas guided through the fuel gas guiding path
  • control means for controlling
  • 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 discharged through the exhaust gas processing unit.
  • the combustion of the fuel gas is performed in a state where the amount of the combustion air relative to the fuel gas is increased in order to enhance the combustion efficiency.
  • the above-mentioned combustion exhaust gas is introduced into the exhaust gas processing unit containing the three-way catalyst through the exhaust pipe,
  • the control means supplies a suitable amount of fuel gas through the fuel gas guide passage. 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.
  • the unburned component gas contained in the combustion exhaust gas led from the exhaust gas processing unit at a position downstream of the exhaust gas processing unit provided in the exhaust pipe in the discharge direction of the combustion exhaust gas.
  • a post-combustion device can be provided to burn the 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.
  • a plurality of combustion burners as described above can be provided.
  • a fuel gas and combustion air are supplied to a combustion burner, the fuel gas is burned in the furnace by the combustion burner, and the combustion exhaust gas after combustion is stored in the furnace.
  • the exhaust pipe is provided with an exhaust gas processing unit containing a three-way catalyst, and the combustion exhaust gas is located upstream of the exhaust gas processing unit in the exhaust gas discharge direction.
  • the heat of the combustion exhaust gas can not only heat the combustion air supplied to the combustion burner but also can heat the atmosphere gas in the preheating zone, so that the heat of the combustion exhaust gas can be effectively used.
  • the fuel gas and the combustion air are supplied to the combustion burner, the fuel gas is burned in the furnace, and the combustion exhaust gas is discharged from the furnace through the exhaust pipe.
  • an exhaust gas processing unit containing a three-way catalyst is provided in the exhaust pipe, and the above-mentioned combustion exhaust gas is led to the above-mentioned exhaust gas processing unit, and harmful NOx in the combustion exhaust gas, or CO gas or hydrocarbon (HC)
  • the first heat exchange means provided at a position upstream of the exhaust gas treatment section in the exhaust gas discharge direction with respect to the unburned component gas composed of gas etc.
  • the combustion exhaust gas led to the exhaust gas treatment section Heat is used to heat the combustion air supplied to the combustion burner, and the second heat exchange means is provided at a position downstream of the exhaust gas treatment section in the exhaust gas discharge direction.
  • a fuel gas guiding passage for guiding a part of the fuel gas supplied to the combustion burner to a position upstream of the exhaust gas processing unit in the discharge direction of the combustion exhaust gas;
  • Control means for controlling the amount of fuel gas to be mixed, and afterburning the unburned component gas contained in the combustion exhaust gas led from the exhaust gas processing unit between the exhaust gas processing unit and the second heat exchange unit.
  • a plurality of combustion burners are provided in the furnace, and combustion air supplied to each combustion burner is heated by the first heat exchange unit, while a preheating zone in the second heat exchange unit It is the schematic explanatory drawing which showed the state which heats the atmospheric gas in.
  • a combustion burner 12 is provided on the furnace wall 11 of the furnace 10, and a fuel such as hydrocarbon (HC) gas is supplied to the combustion burner 12 through the fuel gas supply pipe 21. While supplying the gas, combustion air heated by the heat of the combustion exhaust gas is supplied through the combustion air supply pipe 22 in the first heat exchange means 31 and the second heat exchange means 32 described later, and this combustion burner At 12, the fuel gas and the heated combustion air are mixed to burn the fuel gas in the furnace 10.
  • HC hydrocarbon
  • an exhaust pipe 13 for discharging the combustion exhaust gas after burning the fuel gas in the furnace 10 in this manner from the inside of the furnace 10 is provided, and the exhaust gas processing unit 23 in which the three-way catalyst is accommodated in the exhaust pipe 13 is provided.
  • the combustion exhaust gas after combustion in the furnace 10 is introduced to the exhaust gas processing unit 23 through the exhaust pipe 13 so that the three-way catalyst accommodated in the exhaust gas processing unit 23 processes the combustion exhaust gas. .
  • the first heat exchange means 31 for heating the combustion air by the heat of the combustion exhaust gas is disposed in the exhaust pipe 13 at the upstream side of the exhaust gas discharge direction with respect to the exhaust gas processing unit 23.
  • the second heat exchange means 32 which heats the combustion air by the heat of the combustion exhaust gas while providing the 1 heat exchange part 31, the second heat in the exhaust pipe 13 on the downstream side of the exhaust gas discharge direction with respect to the exhaust gas processing part 23
  • the exchange unit 32 is provided.
  • the first heat exchange unit 31 and the second heat exchange unit 32 are respectively provided in the exhaust pipe 13.
  • the first heat exchange unit 31 and the second heat exchange unit 32 It can also be provided at a position taken out from inside the exhaust pipe 13.
  • the combustion air is guided by the blower 33 through the combustion air guide pipe 34 to the second heat exchange section 32, and the second heat exchange section 32 treats the combustion air as exhaust gas.
  • the combustion exhaust gas is heated by the heat of the combustion exhaust gas led from the portion 23 and the combustion exhaust gas after heating the combustion air is discharged through the exhaust pipe 13 as described above.
  • the combustion air heated in the second heat exchange unit 32 is guided from the second heat exchange unit 32 to the first heat exchange unit 31 through the combustion air guide pipe 34 on the downstream side,
  • the combustion air heated as described above is further heated by the heat of the combustion exhaust gas before being introduced to the exhaust gas processing unit 23, and the combustion air thus heated is It is supplied to the combustion burner 12 through the combustion air supply pipe 22, and the combustion air heated as described above is mixed with the fuel gas to burn the fuel gas.
  • the combustion air is sufficiently heated by the heat of the combustion exhaust gas in the first heat exchange section 31 and the second heat exchange section 32, and in this state, it is led to the combustion burner 12 and the fuel gas is While being burned, the heat of the exhaust gas for combustion can be effectively used, and heat exchange is performed between the exhaust gas for combustion and the air for combustion in the first heat exchange section 31 described above, and the exhaust gas is exhausted.
  • the temperature of the combustion exhaust gas led from the pipe 13 to the exhaust gas processing unit 23 decreases, and the temperature of the combustion exhaust gas exceeds the temperature range in which the three-way catalyst three-way catalyst accommodated in the exhaust gas processing unit 23 can function. Temperature is prevented, and the three-way catalyst enables proper treatment of the combustion exhaust gas.
  • the temperature range in which the three-way catalyst can function is about 400 ° C. to 800 ° C.
  • the amount of NOx generated at the time of combustion is reduced.
  • the amount of combustion air to fuel gas is reduced, for example, the air ratio ⁇ of the combustion air is set to 1.0 or less, and the fuel gas is burned in the combustion burner 12.
  • the amount of combustion air for the fuel gas is further reduced.
  • the amount of unburned component gas in the exhaust gas increases, and there is a risk that exhaust gas from which the unburned component gas remains may be discharged from the exhaust gas processing unit 23 without being sufficiently treated by the three-way catalyst contained in the exhaust gas processing unit 23 .
  • the post-combustion device 24 is provided at a position downstream of the exhaust gas processing unit 23 provided in the exhaust pipe 13 in the discharge direction of the combustion exhaust gas. If necessary, the post-combustion fuel gas supply pipe 24a supplies the post-combustion fuel gas and the post-combustion air supply pipe 24b supplies the post-combustion air to the post-combustion apparatus 24 as necessary. be able to.
  • 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 to oxidize the unburned component gas to CO 2 or H 2 O Make it drain.
  • 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
  • a control valve (control means) 25a may be provided to control the amount of fuel gas supplied to the exhaust pipe 13 at a position upstream of the processing unit 23 in the discharge direction of the combustion exhaust gas.
  • control valve 25 a guides the fuel gas guided through the fuel gas guide path 25 in accordance with the amount of NOx contained in the combustion exhaust gas after being burned in the combustion burner 12. Let the amount be controlled.
  • the amount of the combustion air is increased, for example, When the fuel gas is burned in the combustion burner 12 so that the air ratio ⁇ exceeds 1.0, the fuel gas is burned by a sufficient amount of combustion air, and CO gas or hydrocarbon in the combustion exhaust gas 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.
  • unburned component gas such as (HC) gas
  • the control valve 25a causes the fuel gas guide passage 25 to flow upstream of the exhaust gas processing unit 23 in the exhaust gas discharge direction.
  • An appropriate amount of fuel gas is supplied to the position on the upstream side of the exhaust gas discharge direction from the exhaust gas processing unit 23 by controlling the amount of fuel gas guided to the position, and the fuel gas contains a large amount of NOx. It is made to guide to the exhaust gas processing part 23 which accommodated the three-way catalyst together with the combustion exhaust gas. In this way, NOx in the combustion exhaust gas is reacted with the fuel gas supplied through the fuel gas guide path 25 as described above by the three-way catalyst contained in the exhaust gas processing unit 23 and reduced to N 2. It will be.
  • fuel gas such as hydrocarbon (HC) gas is supplied to each of the combustion burners 12 through the fuel gas supply pipe 21 respectively, and, similar to the industrial furnace in the above embodiment, in the first heat exchange section 31 and the second heat exchange section 32, the combustion air heated by the heat of the combustion exhaust gas is guided to the combustion air supply pipe 22 in each combustion burner 12 through the combustion air guide pipe 34.
  • the combustion air supplied through the combustion air supply pipes 22 is supplied to the combustion burners 12 to burn the fuel gas, and the combustion exhaust gas after the combustion in this way is transferred from the furnace 10 to the exhaust pipe 13. I am trying to lead.
  • the first large diameter portion 13a having a large diameter is provided in the exhaust pipe 13 to which the combustion exhaust gas is introduced, and the combustion exhaust gas is introduced into the first large diameter portion 13a for combustion.
  • the 1st heat exchange part 31 which heats air is provided.
  • a fuel gas guide passage 25 for guiding the fuel gas is provided in the exhaust pipe 13 between the first large diameter portion 13a and the exhaust gas processing unit 23 containing the three-way catalyst, and the fuel gas guide A control valve 25a for controlling the amount of fuel gas supplied to the exhaust pipe 13 through the passage 25 is provided, and the above control is made to correspond to the amount of NOx contained in the combustion exhaust gas after being burned in each of the combustion burners 12
  • the amount of fuel gas guided through the fuel gas guide path 25 is controlled by the valve 25a.
  • the fuel gas guided through the fuel gas guide passage 25 to a position upstream of the exhaust gas processing unit 23 in the exhaust gas discharge direction is controlled by the control valve 25a, and an appropriate amount of fuel gas is supplied to a position upstream of the exhaust gas processing unit 23 in the exhaust gas discharge direction, and the fuel gas is the combustion exhaust gas containing a large amount of NOx. It is led to the exhaust gas processing unit 23 containing the three-way catalyst together, and in this exhaust gas processing unit 23, NOx in the combustion exhaust gas is made to react with the fuel gas and be reduced to N 2 .
  • the post-combustion device 24 is provided in the exhaust pipe 13 at a position downstream of the exhaust gas processing unit 23 in the discharge direction of the combustion exhaust gas, and the post-combustion fuel gas is provided as necessary for The post-combustion fuel gas is supplied from the supply pipe 24a, and the post-combustion air is supplied from the post-combustion air supply pipe 24b.
  • unburned component gas such as CO gas or hydrocarbon (HC) gas
  • HC hydrocarbon
  • a second large diameter portion 13b having a larger diameter is provided in the exhaust pipe 13 on the downstream side in the discharge direction of the combustion exhaust gas than the post-combustion device 24 and the inside of the second large diameter portion 13b
  • the second heat exchanger 32 is provided to heat the combustion air by the heat of the flue gas led to the
  • the combustion air is guided by the blower 33 through the combustion air guide pipe 34 to the second heat exchange section 32, and the second heat exchange section 32
  • the combustion air is heated by the heat of the combustion exhaust gas led from the exhaust gas processing unit 23 or the combustion exhaust gas after being burned in the afterburner 24, and the thus heated combustion air is heated to a second heat.
  • the exchange unit 32 guides the combustion air guide pipe 34 to the first heat exchange unit 31, and the combustion air heated as described above is introduced to the exhaust gas processing unit 23 in the first heat exchange unit 31. Further heat is generated by the heat of the combustion exhaust gas.
  • the combustion air thus heated in the first heat exchange section 31 is supplied from the combustion air guide pipe 34 to the combustion burners 12 through the combustion air supply pipes 22.
  • the combustion air heated as described above is mixed with the fuel gas to burn the fuel gas.
  • the first large diameter portion 13a having a larger diameter in the exhaust pipe 13 for guiding the combustion exhaust gas after being burned in the furnace 10
  • the first heat exchange portion 31 is provided to heat the combustion air by the heat of the combustion exhaust gas led into the first large diameter portion 13a.
  • air for combustion is sent to the first heat exchange section 31 by the blower 33 through the combustion air guide pipe 34, and the combustion air heated in the first heat exchange section 31.
  • the combustion air supply pipe 22 in each combustion burner 12 through the combustion air guide pipe 34.
  • the first large diameter portion 13a provided with the first heat exchange portion 31 and the exhaust gas processing portion 23 accommodating the three-way catalyst And a control valve 25a for controlling the amount of fuel gas supplied to the exhaust pipe 13 through the fuel gas guide path 25.
  • the amount of fuel gas guided through the fuel gas guide passage 25 is controlled by the control valve 25 a in accordance with the amount of NOx contained in the combustion exhaust gas after being burned in each of the combustion burners 12. There is.
  • the control valve 25a guides the fuel gas guide passage 25 to a position upstream of the exhaust gas processing unit 23 in the discharge direction of the combustion exhaust gas. Control the amount of fuel gas to be supplied, and supply an appropriate amount of fuel gas to a position upstream of the exhaust gas processing unit 23 in the exhaust gas discharge direction, and combine this fuel gas with the above-mentioned combustion exhaust gas containing a large amount of NOx.
  • the exhaust gas processing unit 23 in which the three-way catalyst is accommodated is introduced, and in the exhaust gas processing unit 23, NOx in the combustion exhaust gas is reacted with the fuel gas to be reduced to N 2 .
  • the post-combustion device 24 is provided in the exhaust pipe 13 at a position downstream of the exhaust gas processing unit 23 in the exhaust gas discharge direction, and the post-combustion fuel gas is provided to the post-combustion device 24 as needed.
  • the post combustion fuel gas is supplied from the supply pipe 24a and the post combustion air is supplied from the post combustion air supply pipe 24b, and CO gas or hydrocarbon (HC) gas is added to the combustion exhaust gas discharged from the exhaust gas processing unit 23 described above.
  • CO gas or hydrocarbon (HC) gas is added to the combustion exhaust gas discharged from the exhaust gas processing unit 23 described above.
  • the unburned component gas remains, the unburned component gas is burned in the post-combustion device 24 as described above to be oxidized to CO 2 or H 2 O.
  • the exhaust pipe 13 on the downstream side of the exhaust gas discharge direction with respect to the afterburning apparatus 24 is provided with the second large diameter portion 13b having a larger diameter.
  • the second heat exchange portion 32 is provided in the second large diameter portion 13b.
  • the preheating zone 15 is used to preheat the processed material in order to continuously process a long processed material (not shown) such as a steel strip.
  • the furnace 10 and the guide path 16 are provided in communication with each other.
  • the atmosphere gas in the preheating zone 15 is guided by the blower 41 through the atmosphere gas circulation pipe 42 to the second heat exchange unit 32, and in the second heat exchange unit 32,
  • the atmosphere gas is heated by the heat of the combustion exhaust gas from the exhaust gas processing unit 23 led to the second large diameter portion 13 b and the heat of the combustion exhaust gas after the post-combustion by the post-combustion device 24,
  • the atmosphere gas thus heated is returned to the inside of the preheating zone 15 through the atmosphere gas circulation pipe 42, and the atmosphere gas in the preheating zone 15 is heated and circulated in the second heat exchange section 32, and
  • the combustion exhaust gas after heating the atmosphere gas in the second heat exchange section 32 is discharged from the chimney (not shown) through the exhaust pipe 13.
  • a part of the fuel gas supplied to the combustion burner unit 12 through the fuel gas supply pipe 21 is the exhaust gas.
  • a fuel gas guiding path 25 leading to a position in the exhaust gas discharge direction upstream of the processing unit 23 and a fuel gas guiding through the fuel gas guiding path 25 to a position in the exhaust gas discharge direction upstream than the exhaust gas processing unit 23 While the control valve 25a for controlling the amount of the exhaust gas is provided, and the post-combustion device 24 is provided in the exhaust pipe 13 leading the combustion exhaust gas discharged from each exhaust gas processing unit 23, it is not necessary to provide these.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Supply (AREA)
  • Chimneys And Flues (AREA)

Abstract

L'invention concerne un four industriel dans lequel du gaz de combustion et de l'air de combustion sont mélangés et brûlés au moyen d'un brûleur de combustion, et les gaz d'échappement de combustion, après combustion, sont évacués du four à travers un tuyau d'échappement. Le four industriel comprend : une unité de traitement des gaz d'échappement comportant un tuyau d'échappement renfermant un catalyseur trifonctionnel ; une première unité d'échange de chaleur située au niveau d'une position en amont de l'unité de traitement des gaz d'échappement dans la direction d'évacuation des gaz d'échappement de combustion afin de chauffer l'air de combustion à l'aide de la chaleur des gaz d'échappement de combustion ; et une seconde unité d'échange de chaleur située au niveau d'une position en aval de l'unité de traitement des gaz d'échappement dans la direction d'évacuation des gaz d'échappement de combustion afin de chauffer l'air de combustion à l'aide de la chaleur des gaz d'échappement de combustion en provenance de l'unité de traitement des gaz d'échappement.
PCT/JP2017/012325 2016-07-04 2017-03-27 Four industriel WO2018008206A1 (fr)

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KR1020187018442A KR102339526B1 (ko) 2016-07-04 2017-03-27 공업로(工業爐)
CN201780010825.3A CN108700293B (zh) 2016-07-04 2017-03-27 工业炉

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JP2016132157A JP6521908B2 (ja) 2016-07-04 2016-07-04 工業炉
JP2016-132157 2016-07-04

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WO2018008206A1 true WO2018008206A1 (fr) 2018-01-11

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JP (1) JP6521908B2 (fr)
KR (1) KR102339526B1 (fr)
CN (1) CN108700293B (fr)
TW (1) TWI753900B (fr)
WO (1) WO2018008206A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN109268850A (zh) * 2018-10-30 2019-01-25 湖南金炉科技股份有限公司 一种废气处理装置及具有该废气处理装置的热处理窑炉
JP7184471B2 (ja) * 2021-01-26 2022-12-06 中外炉工業株式会社 蓄熱式燃焼設備

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