JP6125055B1 - Combustion treatment equipment - Google Patents

Combustion treatment equipment Download PDF

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JP6125055B1
JP6125055B1 JP2016005902A JP2016005902A JP6125055B1 JP 6125055 B1 JP6125055 B1 JP 6125055B1 JP 2016005902 A JP2016005902 A JP 2016005902A JP 2016005902 A JP2016005902 A JP 2016005902A JP 6125055 B1 JP6125055 B1 JP 6125055B1
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combustion
exhaust gas
heating
treatment
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JP2017124379A (en
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山本 俊輔
俊輔 山本
健介 川端
健介 川端
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Chugai Ro Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C3/00Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/002Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C6/00Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F23C6/04Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/10Nitrogen; Compounds thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/10Nitrogen; Compounds thereof
    • F23J2215/101Nitrous oxide (N2O)
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/40Carbon monoxide
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2219/00Treatment devices
    • F23J2219/10Catalytic reduction devices

Abstract

【課題】 COや炭化水素等の未燃成分が含まれる燃焼排ガスと、NOxが含まれる燃焼排ガスとをまとめて効率よく処理し、環境を害さない安全な状態にして、これらの燃焼排ガスを適切に排出できるようにする。【解決手段】 空気比が1より小さい非酸化状態で燃焼を行う第1の燃焼装置11が設けられた第1の燃焼加熱部10と、空気比が1より大きい状態で燃焼を行う第2の燃焼装置21が設けられた第2の燃焼加熱部20とを有する燃焼処理設備において、第1の燃焼装置による燃焼により第1の燃焼加熱部において生じた未燃成分を含む第1の燃焼排ガスと、第2の燃焼装置による燃焼により第2の燃焼加熱部において生じたNOx成分を含む第2の燃焼排ガスとを一緒にして三元触媒を収容させた排ガス処理部32において処理するようにした。【選択図】 図1PROBLEM TO BE SOLVED: To efficiently treat combustion exhaust gas containing unburned components such as CO and hydrocarbons and combustion exhaust gas containing NOx in a safe state that does not harm the environment and appropriately treat these combustion exhaust gases. So that it can be discharged. SOLUTION: A first combustion heating section 10 provided with a first combustion device 11 that performs combustion in a non-oxidized state where the air ratio is less than 1, and a second that performs combustion while the air ratio is greater than 1. In a combustion treatment facility having a second combustion heating unit 20 provided with a combustion device 21, a first combustion exhaust gas containing unburned components generated in the first combustion heating unit by combustion by the first combustion device; The exhaust gas treatment unit 32 containing the three-way catalyst is combined with the second combustion exhaust gas containing the NOx component generated in the second combustion heating unit by the combustion by the second combustion device. [Selection] Figure 1

Description

本発明は、燃焼処理設備に関するものである。特に、空気比(実際の空気量/理論空気量)が1より小さい非酸化状態で第1の燃焼装置によって燃焼を行い、被処理物を加熱処理する第1の燃焼加熱部と、空気比が1より大きい状態で第2の燃焼装置によって燃焼を行い、被処理物を加熱処理する第2の燃焼加熱部とを有する燃焼処理設備において、第1の燃焼加熱部において発生した未燃成分を含む第1の燃焼排ガスと、第2の燃焼加熱部において発生したNOx成分を含む第2の燃焼排ガスとを、環境を害さない安全な状態に効率よく処理して排出できるようにした点に特徴を有するものである。 The present invention relates to a combustion treatment facility. In particular, the air ratio (actual air quantity / theoretical air quantity) is have a row of combustion by the first combustion device in less than one non-oxidized state, the first combustion heating unit for heating an object to be processed, air ratio There have rows of combustion by the second combustion device greater than one state, the combustion treatment facility and a second combustion heating unit for heating an object to be processed, the unburned components generated in the first combustion heating unit The first combustion exhaust gas containing NO and the second combustion exhaust gas containing the NOx component generated in the second combustion heating section can be efficiently processed and discharged in a safe state that does not harm the environment. It has characteristics.

従来から、燃焼処理設備としては、燃焼装置によって燃料を燃焼させるにあたり、空気比を1より小さくして非酸化状態で燃焼を行うようにしたものや、空気比を1より大きくして酸化状態で燃焼を行うようにしたものが用いられている。   Conventionally, as a combustion treatment facility, when a fuel is burned by a combustion apparatus, combustion is performed in a non-oxidized state with an air ratio smaller than 1, or in an oxidized state with an air ratio larger than 1. The one that is designed to burn is used.

ここで、前記のような燃焼処理設備において、空気比を1より小さくして非酸化状態で燃焼を行うようにした場合には、被処理物が酸化されず、NOxの発生も抑制されるが、燃焼排ガス中にCOや炭化水素(HC)等の未燃成分が残るという問題があった。一方、空気比を1より大きくして酸化状態で燃焼を行うようにした場合には、燃焼時にNOxが発生して、燃焼排ガス中におけるNOxの量が多くなるという問題があった。   Here, in the combustion treatment facility as described above, when the air ratio is made smaller than 1 and combustion is performed in a non-oxidized state, the object to be treated is not oxidized, and generation of NOx is suppressed. There has been a problem that unburned components such as CO and hydrocarbons (HC) remain in the combustion exhaust gas. On the other hand, when the air ratio is made larger than 1 and combustion is performed in an oxidized state, there is a problem that NOx is generated during combustion and the amount of NOx in the combustion exhaust gas increases.

そして、前記のように燃焼排ガス中に残ったCOや炭化水素等の未燃成分が残った場合、従来においては、一般に、前記の燃焼排ガスを燃焼させて、燃焼排ガス中に残ったCOや炭化水素等の未燃成分をCO2やH2Oに酸化させ、燃焼排ガスを安全な状態にして排出させるようにしていた。 When unburned components such as CO and hydrocarbons remaining in the combustion exhaust gas remain as described above, conventionally, the combustion exhaust gas is generally burned to leave the CO and carbonization remaining in the combustion exhaust gas. Unburned components such as hydrogen were oxidized to CO 2 or H 2 O to discharge the combustion exhaust gas in a safe state.

一方、前記のように燃焼排ガス中に含まれるNOxの量が多くなった場合、従来においては、例えば、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の燃焼によって生じたNOxが多く含まれる燃焼排ガスを窒素酸化物還元触媒により浄化させた後、得られたNOx浄化ガスに空気を添加し、更に酸化触媒を用いて未燃成分を酸化除去するようにしたものが提案されている。   On the other hand, when the amount of NOx contained in the combustion exhaust gas increases as described above, conventionally, as shown in, for example, Patent Document 1, the combustion contains a large amount of NOx generated by the combustion of the radiant tube burner. It has been proposed to purify exhaust gas with a nitrogen oxide reduction catalyst, add air to the obtained NOx purification gas, and oxidize and remove unburned components using an oxidation catalyst.

しかし、従来においては、各燃焼処理設備において、燃焼によって発生したCOや炭化水素等の未燃成分が残った燃焼排ガスと、NOxが多く含まれるようになった燃焼排ガスとを、前記のようにそれぞれ別々に処理して排出させるようにしており、各燃焼処理設備においてそれぞれ異なる処理設備が必要になり、設備スペースや設備コストが高く付くと共に、燃焼排ガスを処理するランニングコストも高く付くという問題があった。   However, conventionally, in each combustion treatment facility, the combustion exhaust gas in which unburned components such as CO and hydrocarbons generated by combustion remain, and the combustion exhaust gas in which a large amount of NOx is contained, as described above. Each of the combustion treatment facilities requires different treatment facilities, which requires a different treatment facility, which increases the facility space and facility costs, and increases the running cost of treating the combustion exhaust gas. there were.

また、従来においては、特許文献2に示されるように、ラジアントチューブの両端部に蓄熱式バーナーを設けたラジアントチューブバーナーにおいて、各蓄熱式バーナーにおいて燃焼を行うにあたり、燃焼排ガスや燃焼用空気の流れを制御すると共に、燃料に対する燃焼用空気の空気比を制御させて、燃焼排ガス中におけるCOやNOxの量を少なくするようにしたものが提案されている。   Conventionally, as shown in Patent Document 2, in a radiant tube burner in which a regenerative burner is provided at both ends of a radiant tube, when combustion is performed in each regenerative burner, the flow of combustion exhaust gas or combustion air And controlling the air ratio of combustion air to fuel to reduce the amount of CO and NOx in the combustion exhaust gas has been proposed.

しかし、特許文献2に示されるものも、1つのラジアントチューブバーナーにおいて、燃焼排ガス中におけるCOやNOxの量を少なくするものであり、前記のようにした場合においても、燃焼排ガス中におけるCOとNOxの量を、それぞれ十分に減少させることは困難であった。特に、近年においては、燃焼排ガス中におけるNOxの量をさらに減少させることが要望されており、このような要望に対応させるためには、燃焼排ガス中におけるCOの量が増加するという問題があった。   However, the one disclosed in Patent Document 2 also reduces the amount of CO and NOx in the combustion exhaust gas in one radiant tube burner. Even in the case described above, CO and NOx in the combustion exhaust gas are also reduced. It was difficult to sufficiently reduce the amount of each. In particular, in recent years, there has been a demand for further reducing the amount of NOx in the combustion exhaust gas, and in order to meet such a demand, there has been a problem that the amount of CO in the combustion exhaust gas increases. .

特開2001−241619号公報JP 2001-241619 A 特開平11−223316号公報JP-A-11-223316

本発明は、空気比を1より小さくして非酸化状態で燃焼を行うようにした燃焼処理設備において発生したCOや炭化水素等の未燃成分が残った燃焼排ガスと、空気比を1より大きくして酸化状態で燃焼を行うようにした燃焼処理設備において発生した燃焼排ガス中に含まれるNOxの量が多くなった燃焼排ガスとを処理して排出させる場合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 relates to a combustion exhaust gas in which unburned components such as CO and hydrocarbons are generated in a combustion treatment facility in which combustion is performed in a non-oxidized state with an air ratio smaller than 1, and an air ratio larger than 1. To solve the above-mentioned problems when processing and discharging the combustion exhaust gas in which the amount of NOx contained in the combustion exhaust gas generated in the combustion processing facility which is combusted in an oxidized state is increased Is an issue.

すなわち、本発明においては、COや炭化水素等の未燃成分が残った燃焼排ガスと、燃焼排ガス中に含まれるNOxの量が多くなった燃焼排ガスとをまとめて効率よく処理し、環境を害さない安全な状態にして、これらの燃焼排ガスを適切に排出できるようにすることを課題とするものである。   That is, in the present invention, the combustion exhaust gas in which unburned components such as CO and hydrocarbons remain and the combustion exhaust gas in which the amount of NOx contained in the combustion exhaust gas is increased are efficiently treated together to harm the environment. It is an object to be able to discharge these combustion exhaust gas appropriately in a safe state.

本発明に係る燃焼処理設備においては、前記のような課題を解決するため、空気比が1より小さい非酸化状態で第1の燃焼装置によって燃焼を行い、被処理物を加熱処理する第1の燃焼加熱部と、空気比が1より大きい状態で第2の燃焼装置によって燃焼を行い、被処理物を加熱処理する第2の燃焼加熱部とを有する燃焼処理設備において、第1の燃焼装置による燃焼によって第1の燃焼加熱部において生じた未燃成分を含む第1の燃焼排ガスと、第2の燃焼装置による燃焼によって第2の燃焼加熱部において生じたNOx成分を含む第2の燃焼排ガスとを一緒にして三元触媒を収容させた排ガス処理部に導いて、これらの燃焼排ガスを前記の排ガス処理部において処理するようにした。
In the combustion process equipment according to the present invention, for solving the problems described above, the air ratio have rows combustion by the first combustion device in less than one unoxidized, heat-treating the object to be processed 1 a combustion heating unit, an air ratio have rows combustion by the second combustion device greater than one state, the combustion treatment facility and a second combustion heating unit for heating the object to be processed, a first combustion First combustion exhaust gas containing unburned components generated in the first combustion heating section by combustion by the apparatus and second combustion containing NOx components generated in the second combustion heating section by combustion by the second combustion apparatus Together with the exhaust gas, the exhaust gas was guided to an exhaust gas treatment unit containing a three-way catalyst, and the combustion exhaust gas was treated in the exhaust gas treatment unit.

このように、第1の燃焼加熱部において生じた未燃成分を含む第1の燃焼排ガスと、第2の燃焼加熱部において生じたNOx成分を含む第2の燃焼排ガスとを一緒にして三元触媒を収容させた排ガス処理部に導いて処理すると、前記の三元触媒の作用により、前記の第1の燃焼排ガスに含まれる未燃成分となるCOや炭化水素がCO2やH2Oに酸化される一方、前記の第2の燃焼排ガスに含まれるNOx成分がN2に還元されるようになる。 In this way, the first combustion exhaust gas containing the unburned component generated in the first combustion heating unit and the second combustion exhaust gas containing the NOx component generated in the second combustion heating unit are combined to form a ternary. When guided to an exhaust gas treatment unit containing a catalyst and treated, the three-way catalyst causes CO and hydrocarbons, which are unburned components contained in the first combustion exhaust gas, to turn into CO 2 and H 2 O. While being oxidized, the NOx component contained in the second combustion exhaust gas is reduced to N 2 .

ここで、前記の燃焼処理設備においては、前記の第2の燃焼加熱部における第2の燃焼装置としてラジアントチューブバーナーを用い、ラジアントチューブバーナーの燃焼によってラジアントチューブ内に生じたNOx成分を含む第2の燃焼排ガスを、前記の第1の燃焼装置による燃焼によって第1の燃焼加熱部において生じた未燃成分を含む第1の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に導くようにすることができる。   Here, in the combustion processing facility, a radiant tube burner is used as the second combustion device in the second combustion heating section, and the second containing the NOx component generated in the radiant tube by the combustion of the radiant tube burner. The combustion exhaust gas is guided to the exhaust gas treatment unit containing the three-way catalyst together with the first combustion exhaust gas containing the unburned components generated in the first combustion heating unit by the combustion by the first combustion device. Can be.

また、前記の燃焼処理設備において、前記の第1の燃焼加熱部と第2の燃焼加熱部とを設けるにあたっては、第1の燃焼加熱部と第2の燃焼加熱部とを離れるようにして分離させて設ける他、前記の第1の燃焼加熱部と第2の燃焼加熱部との間にシール部を設けるようにして、第1の燃焼加熱部と第2の燃焼加熱部とを連続して設け、連続するストリップからなる被処理物を前記のシール部を通して一方の燃焼加熱部から他方の燃焼加熱部に導いて、前記の被処理物を連続して加熱処理させるようにすることもできる。   In the combustion treatment facility, when the first combustion heating unit and the second combustion heating unit are provided, the first combustion heating unit and the second combustion heating unit are separated from each other. In addition, the first combustion heating part and the second combustion heating part are continuously provided by providing a seal part between the first combustion heating part and the second combustion heating part. It is also possible to continuously heat-treat the object to be processed by providing the object to be processed comprising continuous strips from one combustion heating part to the other combustion heating part through the seal part.

また、前記の燃焼処理設備においては、三元触媒を収容させた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た燃焼排ガスに残留する未燃成分を酸化させる酸化処理装置を設けることが好ましい。このようにすると、三元触媒を収容させた排ガス処理部において、未燃成分となるCOや炭化水素が十分に酸化されずに残った場合においても、このような未燃成分が前記の酸化処理装置によって適切に酸化され、未燃成分を含む燃焼排ガスが外部に排出されるのが確実に防止されて、より安全性が向上する。   Further, in the combustion treatment facility, unburned components remaining in the combustion exhaust gas discharged from the exhaust gas treatment unit at a position downstream of the exhaust gas treatment unit containing the three-way catalyst in the exhaust gas discharge direction. It is preferable to provide an oxidation treatment apparatus that oxidizes the water. In this way, even in the case where the unburned components such as CO and hydrocarbons remain unoxidized in the exhaust gas treatment unit containing the three-way catalyst, such unburned components remain in the oxidation treatment. It is properly oxidized by the apparatus, and the combustion exhaust gas containing unburned components is surely prevented from being discharged to the outside, thereby improving safety.

本発明に係る燃焼処理設備においては、前記のように第1の燃焼加熱部において生じた未燃成分を含む第1の燃焼排ガスと、第2の燃焼加熱部において生じたNOx成分を含む第2の燃焼排ガスとを一緒にして三元触媒を収容させた排ガス処理部に導くようにしたため、前記の三元触媒の作用により、前記の第1の燃焼排ガスに含まれる未燃成分となるCOや炭化水素がCO2やH2Oに酸化される一方、前記の第2の燃焼排ガスに含まれるNOx成分がN2に還元されるようになる。 In the combustion treatment facility according to the present invention, as described above, the first combustion exhaust gas containing the unburned components generated in the first combustion heating unit and the second NOx component generated in the second combustion heating unit. The exhaust gas is combined with the combustion exhaust gas and led to the exhaust gas treatment unit containing the three-way catalyst, so that the action of the three-way catalyst causes the CO or the unburned component contained in the first combustion exhaust gas. While the hydrocarbon is oxidized to CO 2 or H 2 O, the NOx component contained in the second combustion exhaust gas is reduced to N 2 .

この結果、本発明に係る燃焼処理設備においては、三元触媒を収容させた排ガス処理部において、COや炭化水素等の未燃成分が残った燃焼排ガスと、NOxが含まれる燃焼排ガスとをまとめて効率よく処理し、環境を害さない安全な状態にして、これらの燃焼排ガスを適切に排出できるようになる。   As a result, in the combustion treatment facility according to the present invention, in the exhaust gas treatment unit containing the three-way catalyst, the combustion exhaust gas in which unburned components such as CO and hydrocarbons remain and the combustion exhaust gas containing NOx are collected. It is possible to discharge these combustion exhaust gases appropriately by treating them efficiently and in a safe state that does not harm the environment.

本発明の一実施形態に係る燃焼処理設備において、第1の燃焼加熱部と第2の燃焼加熱部とを連続して設け、第1の燃焼加熱部と第2の燃焼加熱部との間におけるシール部を通して、連続するストリップからなる被処理物を一方の燃焼加熱部から他方の燃焼加熱部に導いて加熱処理させるにあたり、第1の燃焼加熱部において発生した第1の燃焼排ガスと、第2の燃焼加熱部において発生した第2の燃焼排ガスとを、三元触媒を収容させた排ガス処理部に導いて処理する状態を示した概略説明図である。In the combustion treatment facility according to one embodiment of the present invention, the first combustion heating unit and the second combustion heating unit are provided in succession, and between the first combustion heating unit and the second combustion heating unit. The first combustion exhaust gas generated in the first combustion heating unit and the second combustion gas when the object to be processed consisting of continuous strips is guided from one combustion heating unit to the other combustion heating unit through the seal unit and heated. It is the schematic explanatory drawing which showed the state which guide | induces and processes the 2nd combustion exhaust gas generate | occur | produced in the combustion heating part of this to the waste gas processing part which accommodated the three way catalyst. 前記の実施形態に係る燃焼処理設備において、三元触媒を収容させた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た燃焼排ガスに残留する未燃成分を酸化させる酸化処理装置を設けた状態を示した概略説明図である。In the combustion treatment facility according to the above-described embodiment, unburned components remaining in the combustion exhaust gas discharged from the exhaust gas treatment unit are disposed at positions downstream of the exhaust gas treatment unit containing the three-way catalyst in the exhaust gas exhaust direction. It is the schematic explanatory drawing which showed the state which provided the oxidation processing apparatus to oxidize. 前記の実施形態に係る燃焼処理設備において、第1の燃焼加熱部と第2の燃焼加熱部とを分離させて設けた第1の変更例を示した概略説明図である。It is the schematic explanatory drawing which showed the 1st modified example which isolate | separated and provided the 1st combustion heating part and the 2nd combustion heating part in the combustion processing equipment which concerns on the said embodiment. 前記の実施形態に係る燃焼処理設備において、第1の燃焼加熱部と第2の燃焼加熱部とを分離させて設けた第2の変更例を示した概略説明図である。It is the schematic explanatory drawing which showed the 2nd modification which isolate | separated and provided the 1st combustion heating part and the 2nd combustion heating part in the combustion processing equipment which concerns on the said embodiment.

以下、本発明の実施形態に係る燃焼処理設備を添付図面に基づいて具体的に説明する。なお、本発明に係る燃焼処理設備は、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 combustion treatment facility according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. Note that the combustion treatment facility according to the present invention is not limited to the one shown in the following embodiment, and can be implemented with appropriate modifications within a range not changing the gist of the invention.

この実施形態における燃焼処理設備においては、図1に示すように、空気比μが1より小さい非酸化状態で第1の燃焼装置11によって燃焼を行う第1の燃焼加熱部10と、空気比μが1より大きい状態で第2の燃焼装置21によって燃焼を行う第2の燃焼加熱部20との間にシール部30を設けるようにして、第1の燃焼加熱部10と第2の燃焼加熱部20とを連続して設け、連続するストリップからなる被処理物Wを前記のシール部30を通して第1の燃焼加熱部10から第2の燃焼加熱部20に導いて、前記の被処理物Wを連続して加熱処理するようにしている。   In the combustion treatment facility in this embodiment, as shown in FIG. 1, the first combustion heating unit 10 that performs combustion by the first combustion device 11 in a non-oxidized state in which the air ratio μ is smaller than 1, and the air ratio μ The first combustion heating unit 10 and the second combustion heating unit are provided with the seal unit 30 between the second combustion heating unit 20 that performs combustion by the second combustion device 21 in a state where the value is larger than 1. 20, the workpiece W made of continuous strips is guided from the first combustion heating section 10 to the second combustion heating section 20 through the seal portion 30, and the workpiece W is Heat treatment is continuously performed.

ここで、この燃焼処理設備においては、前記の第1の燃焼加熱部10における第1の燃焼装置11として、燃料供給管11aから供給された燃料ガスと、燃焼用空気供給管11bから供給された燃焼用空気とを混合させて燃焼させる直火バーナー11Aを用い、前記のストリップからなる被処理物Wの表面を酸化させないように、前記の燃料ガスに対する燃焼用空気の空気比μが1.0未満(μ<1.0)になるようにしている。このように、燃料ガスに対する燃焼用空気の空気比μを1.0未満にして直火バーナー11Aにより燃焼させると、この第1の燃焼加熱部10において発生する第1の燃焼排ガス中にCOや炭化水素からなる未燃成分がある程度含まれるようになる。   Here, in this combustion treatment facility, as the first combustion device 11 in the first combustion heating section 10, the fuel gas supplied from the fuel supply pipe 11a and the combustion air supply pipe 11b were supplied. An air ratio μ of the combustion air to the fuel gas is 1.0 so as not to oxidize the surface of the workpiece W made of the strip by using the direct fire burner 11A that mixes and burns with the combustion air. Less than (μ <1.0). In this way, when the air ratio μ of the combustion air to the fuel gas is made less than 1.0 and combustion is performed by the direct fire burner 11A, CO or CO is contained in the first combustion exhaust gas generated in the first combustion heating unit 10. Unburned components made of hydrocarbons are included to some extent.

そして、このように未燃成分がある程度含まれる第1の燃焼排ガスを、第1の燃焼加熱部10から排ガス案内管31を通して、三元触媒を収容させた排ガス処理部32に導くようにしている。   Then, the first combustion exhaust gas containing unburned components to some extent as described above is guided from the first combustion heating section 10 through the exhaust gas guide pipe 31 to the exhaust gas processing section 32 containing the three-way catalyst. .

一方、前記の第2の燃焼加熱部20においては、第2の燃焼装置21として、ラジアントチューブ21aの一端にバーナー21bが設けられたラジアントチューブバーナー21Aを用い、このラジアントチューブバーナー21Aにおけるラジアントチューブ21aを第2の燃焼加熱部20内に配置させている。   On the other hand, in the second combustion heating section 20, a radiant tube burner 21A in which a burner 21b is provided at one end of the radiant tube 21a is used as the second combustion device 21, and the radiant tube 21a in the radiant tube burner 21A is used. Is disposed in the second combustion heating section 20.

そして、燃料供給管21cから供給された燃料ガスと燃焼用空気供給管21dから供給された燃焼用空気とを、空気比μが1.0よりも大きく(μ>1.0)なるように混合させて前記のラジアントチューブ21aの一端に設けられたバーナー21bに導き、このバーナー21bにより燃焼させるようにしている。このように空気比μを1.0よりも大きくして燃焼させると、この第2の燃焼排ガス中に有害なNOx成分がある程度含まれるようになる。   Then, the fuel gas supplied from the fuel supply pipe 21c and the combustion air supplied from the combustion air supply pipe 21d are mixed so that the air ratio μ is larger than 1.0 (μ> 1.0). Then, it is guided to a burner 21b provided at one end of the radiant tube 21a, and is burned by this burner 21b. When combustion is performed with the air ratio μ being larger than 1.0 in this way, harmful NOx components are included in the second combustion exhaust gas to some extent.

そして、このようにNOx成分が含まれる第2の燃焼排ガスを、バーナー21bが設けられていないラジアントチューブ21aの他端側から排ガス案内管31を通して、第1の燃焼排ガスと同じ三元触媒を収容させた排ガス処理部32に導くようにしている。   The second combustion exhaust gas containing the NOx component is accommodated in the same way as the first combustion exhaust gas through the exhaust gas guide tube 31 from the other end of the radiant tube 21a not provided with the burner 21b. The exhaust gas treatment unit 32 is guided to the exhaust gas treatment unit 32.

ここで、前記のように未燃成分が含まれた第1の燃焼排ガスとNOx成分が含まれた第2の燃焼排ガスとを三元触媒を収容させた排ガス処理部32に導き、これらの燃焼排ガスを排ガス処理部32に収容された三元触媒によって処理させると、第1の燃焼排ガスに含まれた未燃成分のCOや炭化水素がCO2やH2Oに酸化される一方、前記の第2の燃焼排ガスに含まれたNOx成分がN2に還元されて、第1の燃焼排ガスに含まれる未燃成分と第2の燃焼排ガスに含まれるNOx成分とがまとめて効率よく環境を害さない安全な状態となるように処理されるようになる。 Here, the first combustion exhaust gas containing the unburned component and the second combustion exhaust gas containing the NOx component as described above are led to the exhaust gas treatment unit 32 containing the three-way catalyst, and these combustions are performed. When the exhaust gas is processed by the three-way catalyst accommodated in the exhaust gas processing unit 32, the unburned components CO and hydrocarbons contained in the first combustion exhaust gas are oxidized to CO 2 and H 2 O, while The NOx component contained in the second combustion exhaust gas is reduced to N 2 , and the unburned component contained in the first combustion exhaust gas and the NOx component contained in the second combustion exhaust gas are efficiently harmed together. Will be processed to be in a safe state.

そして、このように三元触媒を収容させた排ガス処理部32において処理されて、環境を害さない安全な状態になった後の燃焼排ガスを煙突33に導いて排出させるようにしている。   The combustion exhaust gas after being processed in the exhaust gas processing unit 32 containing the three-way catalyst in this way and brought into a safe state that does not harm the environment is guided to the chimney 33 to be discharged.

また、この実施形態における燃焼処理設備において、未燃成分が含まれる第1の燃焼排ガスとNOx成分が含まれる第2の燃焼排ガスとを三元触媒を収容させた排ガス処理部32において処理した後においても、処理後の燃焼排ガス中に依然として未燃成分が残ることがあり、このように未燃成分が残っ状態で燃焼排ガスを煙突33から排出させる場合に、これらの未燃成分が溜まって爆発したりするおそれがある。
Further, in the combustion treatment facility in this embodiment, after the first combustion exhaust gas containing the unburned component and the second combustion exhaust gas containing the NOx component are processed in the exhaust gas processing unit 32 containing the three-way catalyst. in also may still unburned components in combustion exhaust gas after treatment remains, thus the flue gas in a state where the unburned components remaining in the case of emissions from the chimney 33, accumulates these unburned components There is a risk of explosion.

このため、図2に示すように、三元触媒を収容させた前記の排ガス処理部32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32から排出された燃焼排ガス中に残留する未燃成分を酸化させる酸化処理装置34を設けることが好ましい。ここで、前記の酸化処理装置34としては、例えば、燃焼排ガス中に残留する未燃成分を燃焼させる後燃焼装置や、酸化触媒を収容させた酸化処理部を設けるようにすることができる。   For this reason, as shown in FIG. 2, it remains in the combustion exhaust gas discharged from the exhaust gas processing unit 32 at a position downstream of the exhaust gas processing unit 32 containing the three-way catalyst in the exhaust gas exhaust direction. It is preferable to provide an oxidation treatment device 34 that oxidizes unburned components. Here, as the oxidation treatment device 34, for example, a post-combustion device that burns unburned components remaining in the combustion exhaust gas, or an oxidation treatment unit that contains an oxidation catalyst can be provided.

また、前記の実施形態における燃焼処理設備においては、空気比μが1より小さい非酸化状態で第1の燃焼装置11によって燃焼を行う第1の燃焼加熱部10と、空気比μが1より大きい状態で第2の燃焼装置21によって燃焼を行う第2の燃焼加熱部20とをシール部30を介して連続するように設け、連続するストリップからなる被処理物Wを前記のシール部30を通して第1の燃焼加熱部10から第2の燃焼加熱部20に導いて、前記の被処理物Wを連続して加熱処理するようにしたが、第1の燃焼加熱部10と第2の燃焼加熱部20とを分離させて設け、第1の燃焼加熱部10と第2の燃焼加熱部20とにおいて、それぞれ別の被処理物Wを加熱処理させるようにすることもできる。   In the combustion treatment facility in the above-described embodiment, the first combustion heating unit 10 that performs combustion by the first combustion device 11 in a non-oxidized state in which the air ratio μ is smaller than 1, and the air ratio μ is larger than 1. A second combustion heating unit 20 that performs combustion by the second combustion device 21 in a state is provided so as to be continuous through the seal unit 30, and the workpiece W formed of continuous strips is passed through the seal unit 30 through the first unit. The first combustion heating unit 10 is guided to the second combustion heating unit 20 to continuously heat the workpiece W. The first combustion heating unit 10 and the second combustion heating unit 20 can be provided separately, and the first combustion heating unit 10 and the second combustion heating unit 20 can heat-treat different workpieces W, respectively.

例えば、図3に示すように、空気比μが1より小さい非酸化状態で燃焼を行う第1の燃焼装置11に、前記の実施形態と同様の直火バーナー11Aを用いた第1の燃焼加熱部10と、空気比μが1より大きい状態で燃焼を行う第2の燃焼装置21に、前記の実施形態と同様のラジアントチューブバーナー21Aを用いた第2の燃焼加熱部20とを分離させて設けるようにすることができる。   For example, as shown in FIG. 3, the first combustion heating using the direct combustion burner 11A similar to the above embodiment is used for the first combustion apparatus 11 that performs combustion in a non-oxidized state where the air ratio μ is smaller than 1. And the second combustion heating unit 20 using the radiant tube burner 21A similar to the above-described embodiment is separated from the part 10 and the second combustion device 21 that performs combustion in a state where the air ratio μ is larger than 1. It can be provided.

そして、この場合においても、第1の燃焼加熱部10において発生した未燃成分を含む第1の燃焼排ガスを、第1の燃焼加熱部10から排ガス案内管31を通して、三元触媒を収容させた排ガス処理部32に導くようにすると共に、第2の燃焼加熱部20において、バーナー21bが設けられていないラジアントチューブ21aの他端側から排出されるNOx成分を含む第2の燃焼排ガスを、排ガス案内管31を通して、第1の燃焼排ガスと同じ三元触媒を収容させた排ガス処理部32に導き、これらの燃焼排ガスを排ガス処理部32における三元触媒によって処理させるようにする。   In this case as well, the three-way catalyst is accommodated from the first combustion heating unit 10 through the exhaust gas guide pipe 31 to the first combustion exhaust gas containing unburned components generated in the first combustion heating unit 10. The second combustion exhaust gas containing the NOx component discharged from the other end side of the radiant tube 21a in which the burner 21b is not provided in the second combustion heating section 20 is exhausted to the exhaust gas treatment section 32. Through the guide tube 31, the exhaust gas treatment unit 32 containing the same three-way catalyst as the first combustion exhaust gas is guided, and the combustion exhaust gas is processed by the three-way catalyst in the exhaust gas treatment unit 32.

このようにすると、前記の実施形態の場合と同様に、第1の燃焼排ガスに含まれる未燃成分となるCOや炭化水素がCO2やH2Oに酸化される一方、前記の第2の燃焼排ガスに含まれるNOx成分がN2に還元され、燃焼排ガスが環境を害さない安全な状態になって煙突33に導かれて排出されるようになる。 In this way, as in the case of the above-described embodiment, CO and hydrocarbons that are unburned components contained in the first combustion exhaust gas are oxidized to CO 2 and H 2 O, while the second The NOx component contained in the combustion exhaust gas is reduced to N 2 , and the combustion exhaust gas enters a safe state that does not harm the environment and is led to the chimney 33 and discharged.

また、第1の燃焼加熱部10と第2の燃焼加熱部20とを分離させて設けるにあたり、図4に示すように、第1の燃焼加熱部10においては、前記の実施形態と同様に、空気比μが1より小さい非酸化状態で燃焼を行う第1の燃焼装置11として、空気比μが1.0未満になるようにして燃焼を行う直火バーナー11Aを設ける一方、第2の燃焼加熱部20において、空気比μが1より大きい状態で燃焼を行う第2の燃焼装置21として、燃料供給管21cから供給された燃料ガスに燃焼用空気供給管21dから供給された燃焼用空気を混合させて燃焼させる直火バーナー21Bを用い、空気比μを1.0よりも大きくして燃焼させるようにすることができる。   Moreover, in providing the 1st combustion heating part 10 and the 2nd combustion heating part 20 separately, as shown in FIG. 4, in the 1st combustion heating part 10, similarly to the said embodiment, as shown in FIG. As the first combustion apparatus 11 that performs combustion in a non-oxidized state in which the air ratio μ is less than 1, a direct fire burner 11A that performs combustion so that the air ratio μ is less than 1.0 is provided, while the second combustion In the heating unit 20, the combustion air supplied from the combustion air supply pipe 21d to the fuel gas supplied from the fuel supply pipe 21c is used as the second combustion device 21 that performs combustion in a state where the air ratio μ is greater than 1. The direct fire burner 21B that is mixed and burned can be used to burn with an air ratio μ larger than 1.0.

そして、前記の第1の燃焼加熱部10において発生した未燃成分を含む第1の燃焼排ガスを、第1の燃焼加熱部10から排ガス案内管31を通して、三元触媒を収容させた排ガス処理部32に導くようにすると共に、前記の第2の燃焼加熱部20において発生したNOx成分を含む第2の燃焼排ガスを、排ガス案内管31を通して、第1の燃焼排ガスと同じ三元触媒を収容させた排ガス処理部32に導き、これらの燃焼排ガスを排ガス処理部32における三元触媒によって処理させるようにする。   And the exhaust gas treatment part which accommodated the three way catalyst from the 1st combustion heating part 10 through the exhaust gas guide pipe 31 with the 1st combustion exhaust gas generated in the above-mentioned 1st combustion heating part 10 The second combustion exhaust gas containing the NOx component generated in the second combustion heating unit 20 is accommodated in the same three-way catalyst as the first combustion exhaust gas through the exhaust gas guide pipe 31. The exhaust gas treatment unit 32 guides the combustion exhaust gas to the three-way catalyst in the exhaust gas treatment unit 32.

このようにすると、前記の場合と同様に、第1の燃焼排ガスに含まれる未燃成分となるCOや炭化水素がCO2やH2Oに酸化される一方、前記の第2の燃焼排ガスに含まれるNOx成分がN2に還元され、燃焼排ガスが環境を害さない安全な状態になって煙突33に導かれて排出されるようになる。 In this manner, as in the case described above, CO and hydrocarbons, which are unburned components contained in the first combustion exhaust gas, are oxidized to CO 2 and H 2 O, while the second combustion exhaust gas is converted into the second combustion exhaust gas. The contained NOx component is reduced to N 2 , and the combustion exhaust gas enters a safe state that does not harm the environment, and is led to the chimney 33 and discharged.

なお、前記の図3や図4に示すように、第1の燃焼加熱部10と第2の燃焼加熱部20とを分離させて設けた場合においても、前記の図2に示すように、三元触媒を収容させた前記の排ガス処理部32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32から排出された燃焼排ガス中に残留する未燃成分を酸化させる酸化処理装置34を設けることが好ましい。   As shown in FIG. 3 and FIG. 4, even when the first combustion heating unit 10 and the second combustion heating unit 20 are provided separately, as shown in FIG. An oxidation treatment device 34 that oxidizes unburned components remaining in the combustion exhaust gas discharged from the exhaust gas treatment unit 32 at a position downstream of the exhaust gas treatment unit 32 containing the original catalyst in the exhaust gas exhaust direction. It is preferable to provide it.

なお、図示は省略しているが、燃料供給管11a,21c及び燃焼用空気供給管11b,21dには空気比を調整するための流量調整弁等を備えていることは言うまでもない。   In addition, although illustration is abbreviate | omitted, it cannot be overemphasized that the fuel supply pipes 11a and 21c and the combustion air supply pipes 11b and 21d are provided with a flow rate adjusting valve or the like for adjusting the air ratio.

10 :第1の燃焼加熱部
11 :第1の燃焼装置
11A :直火バーナー
11a :燃料供給管
11b :燃焼用空気供給管
20 :第2の燃焼加熱部
21 :第2の燃焼装置
21A :ラジアントチューブバーナー
21B :直火バーナー
21a :ラジアントチューブ
21b :バーナー
21c :燃料供給管
21d :燃焼用空気供給管
30 :シール部
31 :排ガス案内管
32 :排ガス処理部
33 :煙突
34 :酸化処理装置
W :被処理物
DESCRIPTION OF SYMBOLS 10: 1st combustion heating part 11: 1st combustion apparatus 11A: Direct fire burner 11a: Fuel supply pipe | tube 11b: Combustion air supply pipe | tube 20: 2nd combustion heating part 21: 2nd combustion apparatus 21A: Radiant Tube burner 21B: Direct fire burner 21a: Radiant tube 21b: Burner 21c: Fuel supply pipe 21d: Combustion air supply pipe 30: Seal part 31: Exhaust gas guide pipe 32: Exhaust gas treatment part 33: Chimney 34: Oxidation treatment apparatus W: Workpiece

Claims (4)

空気比が1より小さい非酸化状態で第1の燃焼装置によって燃焼を行い、被処理物を加熱処理する第1の燃焼加熱部と、空気比が1より大きい状態で第2の燃焼装置によって燃焼を行い、被処理物を加熱処理する第2の燃焼加熱部とを有する燃焼処理設備において、第1の燃焼装置による燃焼によって第1の燃焼加熱部において生じた未燃成分を含む第1の燃焼排ガスと、第2の燃焼装置による燃焼によって第2の燃焼加熱部において生じたNOx成分を含む第2の燃焼排ガスとを一緒にして三元触媒を収容させた排ガス処理部に導いて、これらの燃焼排ガスを前記の排ガス処理部において処理することを特徴とする燃焼処理設備。 There line combustion by the first combustion device air ratio is smaller than 1 non-oxidized state, the first combustion heating unit for heating an object to be processed, the air ratio is a second combustion device at larger than one There line combustion, first containing the combustion treatment facility and a second combustion heating unit for heating an object to be processed, the unburned components generated in the first combustion heating unit by combustion of the first combustion device And the second combustion exhaust gas containing the NOx component generated in the second combustion heating unit by the combustion by the second combustion device are led to the exhaust gas treatment unit containing the three-way catalyst, A combustion treatment facility characterized in that these combustion exhaust gases are treated in the exhaust gas treatment section. 請求項1に記載の燃焼処理設備において、前記の第2の燃焼加熱部における第2の燃焼装置にラジアントチューブバーナーを用い、ラジアントチューブバーナーの燃焼によってラジアントチューブ内に生じたNOx成分を含む第2の燃焼排ガスを、前記の第1の燃焼装置による燃焼によって第1の燃焼加熱部において生じた未燃成分を含む第1の燃焼排ガスと一緒にして、三元触媒を収容させた前記の排ガス処理部に導くことを特徴とする燃焼処理設備。   2. The combustion treatment facility according to claim 1, wherein a radiant tube burner is used for the second combustion device in the second combustion heating section, and the NOx component generated in the radiant tube by the combustion of the radiant tube burner is included in the second combustion apparatus. The above-mentioned exhaust gas treatment in which the three-way catalyst is accommodated together with the first combustion exhaust gas containing the unburned components generated in the first combustion heating section by the combustion by the first combustion device Combustion treatment facility characterized by being led to a part. 請求項1又は請求項2に記載の燃焼処理設備において、前記の第1の燃焼加熱部と第2の燃焼加熱部との間にシール部を設けるようにして、第1の燃焼加熱部と第2の燃焼加熱部とを連続して設け、連続するストリップからなる被処理物を前記のシール部を通して一方の燃焼加熱部から他方の燃焼加熱部に導いて、前記の被処理物を連続して加熱処理することを特徴とする燃焼処理設備。   3. The combustion treatment facility according to claim 1, wherein a seal portion is provided between the first combustion heating portion and the second combustion heating portion, and the first combustion heating portion and the first combustion heating portion 2 combustion heating parts are continuously provided, and the object to be processed consisting of continuous strips is guided from one combustion heating part to the other combustion heating part through the seal part, and the object to be processed is continuously provided. A combustion treatment facility characterized by heat treatment. 請求項1〜請求項3の何れか1項に記載の燃焼処理設備において、三元触媒を収容させた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た燃焼排ガスに残留する未燃成分を酸化させる酸化処理装置を設けたことを特徴とする燃焼処理設備。
The combustion treatment facility according to any one of claims 1 to 3, wherein the exhaust gas treatment unit discharges the exhaust gas from the exhaust gas treatment unit to a position downstream of the exhaust gas treatment unit containing the three-way catalyst in the exhaust gas exhaust direction. A combustion treatment facility comprising an oxidation treatment device for oxidizing unburned components remaining in the produced combustion exhaust gas.
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