TWI753900B - Industrial furnace - Google Patents

Industrial furnace Download PDF

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TWI753900B
TWI753900B TW106113068A TW106113068A TWI753900B TW I753900 B TWI753900 B TW I753900B TW 106113068 A TW106113068 A TW 106113068A TW 106113068 A TW106113068 A TW 106113068A TW I753900 B TWI753900 B TW I753900B
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exhaust gas
combustion
gas
fuel gas
heat exchange
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TW106113068A
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Chinese (zh)
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TW201802398A (en
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川端健介
有松毅
惠上寿雄
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日商中外爐工業股份有限公司
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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

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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

Provided is an industrial furnace in which fuel gas and air for burning are mixed and burned by a burner, and burning exhaust gas after burning is discharged from the interior of the furnace through an exhaust pipe, an exhaust gas treating section in which a three-way catalyst is received being provided in the exhaust pipe, a first heat exchanger for heating the air for burning by the heat of the burning exhaust gas being provided at a position in an upstream side of the exhaust gas treating section with regard to a discharging direction of the burning exhaust gas, and a second heat exchanger for heating the air for burning by the heat of the burning exhaust gas guided from the exhaust gas treating section being provided at a position in a downstream side of the exhaust gas treating section with regard to the discharging direction of the burning exhaust gas.

Description

工業爐 industrial furnace

本發明係關於一種對燃燒器供給燃料氣體及燃燒用空氣，且藉由前述燃燒器而使燃料氣體在爐內燃燒，並將燃燒後之燃燒排氣通過排氣管從爐內排出之工業爐。具體而言具有下述特徵：在如前所述對燃燒器供給燃料氣體及燃燒用空氣，並藉由燃燒器而使燃料氣體在爐內燃燒時，防止在燃燒排氣中包含了有害的氮氧化物(以下稱為NOx)，且包含有CO氣體或碳化氫氣體(HC)等未燃成分氣體的狀態下，使燃燒排氣通過排氣管排出至外部，並且有效地利用燃燒排氣之熱。 The present invention relates to an industrial furnace in which fuel gas and combustion air are supplied to a burner, the fuel gas is burned in the furnace by the above-mentioned burner, and the combustion exhaust gas after combustion is discharged from the furnace through an exhaust pipe . Specifically, it has the feature of preventing harmful nitrogen from being included in the combustion exhaust gas when the fuel gas and combustion air are supplied to the burner as described above and the fuel gas is burned in the furnace by the burner In the state where oxides (hereinafter referred to as NOx) and unburned component gases such as CO gas or hydrocarbon gas (HC) are contained, the combustion exhaust gas is discharged to the outside through the exhaust pipe, and the combustion exhaust gas is effectively utilized. hot.

以往，在加熱爐或熱處理爐等工業爐中，於對被處理物進行加熱處理時，一般而言係對燃燒器供給燃料氣體及燃燒用空氣，並藉由前述燃燒器使燃料氣體在爐內燃燒，並使燃燒後之燃燒排氣從爐內通過排氣管而排出。 Conventionally, in industrial furnaces such as heating furnaces and heat treatment furnaces, when heat-treating an object to be processed, generally, fuel gas and combustion air are supplied to a burner, and the fuel gas is circulated in the furnace by the burner. Combustion, and the combustion exhaust gas after combustion is discharged from the furnace through the exhaust pipe.

在此，於該種工業爐中，如前所述對燃燒器供給燃料氣體及燃燒用空氣，並使燃料氣體在爐內燃燒時，為了提升燃燒效率，使相對於燃料氣體之燃燒用空氣 的量增多以進行燃燒時，在燃燒時會使NOx大量產生，包含大量NOx之燃燒排氣會從爐內通過排氣管而排出至外部，而有大幅地損害環境之問題。特別是，近年來，期望大幅地使燃燒排氣中之NOx減低。 Here, in this type of industrial furnace, when the fuel gas and combustion air are supplied to the burner as described above and the fuel gas is burned in the furnace, in order to improve the combustion efficiency, the combustion air with respect to the fuel gas is When the amount of the fuel is increased for combustion, a large amount of NOx is generated during combustion, and the combustion exhaust gas containing a large amount of NOx is discharged from the furnace through the exhaust pipe to the outside, and there is a problem that the environment is greatly damaged. In particular, in recent years, it has been desired to significantly reduce NOx in combustion exhaust gas.

另一方面，為了抑制NOx包含在燃燒排氣，使相對於燃料氣體之燃燒用空氣的量減少而進行燃燒時，燃燒效率降低，並且使CO氣體或碳化氫(HC)氣體等未燃成分氣體大量殘留在燃燒排氣中，且該未燃成分氣體從爐內通過排氣管排出至外部，而在安全性或環境之點會有問題。 On the other hand, in order to suppress the inclusion of NOx in the combustion exhaust gas, when the amount of combustion air relative to the fuel gas is reduced and the combustion is carried out, the combustion efficiency is lowered, and the unburned component gas such as CO gas and hydrocarbon (HC) gas is reduced. A large amount remains in the combustion exhaust gas, and this unburned component gas is exhausted from the furnace to the outside through an exhaust pipe, and there are problems in terms of safety and environment.

並且，近年來，如專利文獻1所示，係提案一種利用氮氧化物還原觸媒將來自輻射管燃燒器之燃燒排氣予以淨化，並在以使空氣比μ(實際空氣量/理論空氣量)成為1.0以上之方式將燃燒用空氣添加在所得之NOx淨化氣體之後，更利用氧化觸媒使未燃成分氧化去除者。 In addition, in recent years, as shown in Patent Document 1, it has been proposed to purify the combustion exhaust gas from the radiant tube burner by using a nitrogen oxide reduction catalyst, and to make the air ratio μ(actual air amount/theoretical air amount). ) is 1.0 or more, after adding combustion air to the obtained NOx purifying gas, and further using an oxidation catalyst to oxidize and remove unburned components.

在此，在專利文獻1所示的手段，係必須設置收容氮氧化物還原觸媒之第一排氣處理部、及收容氧化觸媒之第二排氣處理部，並且使空氣供給至該第一排氣處理部與第二排氣處理部之間，而會有裝置變得複雜而大型化等問題。 Here, in the means disclosed in Patent Document 1, it is necessary to provide a first exhaust gas treatment part that accommodates a nitrogen oxide reduction catalyst and a second exhaust treatment part to accommodate an oxidation catalyst, and supply air to the second exhaust gas treatment part. Between the first exhaust treatment part and the second exhaust treatment part, there is a problem that the device becomes complicated and enlarged.

再者，就一種排氣處理而言，已知有藉由三元觸媒(three way catalyst)而使會對安全、環境、人體等造成不良影響之CO、HC、NOx氧化、還原，使之變化成H2O、CO2、N2而進行淨化的手段。例如專利文獻2所示提 出：在具有蓄熱層之交替式燃燒器中，於各燃燒器部之蓄熱層設置三元觸媒層，且以符合三元觸媒層之活性條件的方式將爐內空氣比調整成0.98至1.02並使之燃燒的手段。 Furthermore, in terms of an exhaust gas treatment, it is known to oxidize and reduce CO, HC, and NOx, which have adverse effects on safety, environment, human body, etc., by means of three-way catalysts. A means for purification by changing into H 2 O, CO 2 and N 2 . For example, as shown in Patent Document 2, in an alternating burner having a regenerator layer, a ternary catalyst layer is provided on the regenerator layer of each burner part, and the interior of the furnace is adjusted so as to satisfy the activation conditions of the ternary catalyst layer. A means of adjusting the air ratio to 0.98 to 1.02 and making it burn.

然而，專利文獻2所示的手段係限定要使用之爐的種類或使用條件，難以在各式各樣的爐中在種種的條件下使用。 However, the means shown in Patent Document 2 limits the type of furnace to be used and the conditions of use, and it is difficult to use it under various conditions in various furnaces.

(先前技術文獻) (prior art literature) (專利文獻) (patent literature)

專利文獻1：日本特開2001-241619號公報 Patent Document 1: Japanese Patent Laid-Open No. 2001-241619

專利文獻2：日本特開平7-133905號公報 Patent Document 2: Japanese Patent Application Laid-Open No. 7-133905

本發明之課題係在於解決工業爐之前述問題，該工業爐係對燃燒器供給燃料氣體及燃燒用空氣，藉由前述燃燒器而使燃料氣體在爐內燃燒，使燃燒後之燃燒排氣從爐內通過排氣管而排出。 An object of the present invention is to solve the above-mentioned problems of an industrial furnace that supplies fuel gas and combustion air to a burner, burns the fuel gas in the furnace by the burner, and causes the combustion exhaust gas after combustion to escape from the burner. The inside of the furnace is discharged through the exhaust pipe.

亦即，在本發明之工業爐中具有下述特徵：對燃燒器供給燃料氣體及燃燒用空氣，且藉由燃燒器使燃料氣體在爐內燃燒之後，使燃燒排氣從爐內通過排氣管排出時，在燃燒排氣中包含有害之NOx，且在包含CO氣體或碳化氫(HC)氣體等未燃成分氣體之狀態下，適當地防止燃燒排氣朝外部之排出，並且有效地利用燃燒排氣之熱。 That is, the industrial furnace of the present invention is characterized in that the fuel gas and combustion air are supplied to the burner, and after the fuel gas is burned in the furnace by the burner, the combustion exhaust gas is passed through the exhaust gas from the furnace. When the exhaust gas is exhausted, harmful NOx is contained in the combustion exhaust gas, and the combustion exhaust gas is appropriately prevented from being discharged to the outside in a state in which unburned gas such as CO gas or hydrocarbon (HC) gas is contained, and the exhaust gas is effectively used. The heat of combustion exhaust.

在本發明之工業爐中，為了要解決前述之課題，在對燃燒器供給燃料氣體及燃燒用空氣，並藉由前述燃燒器使燃料氣體在爐內燃燒，且使燃燒後之燃燒排氣從爐內通過排氣管而排出的工業爐中：在前述排氣管設置收容三元觸媒之排氣處理部，並且在比前述排氣處理部更靠近燃燒排氣之排出方向上游側的位置，設置有藉由燃燒排氣之熱而使供給至燃燒器之燃燒用空氣加熱的第一熱交換手段，又在比前述排氣處理部更靠近燃燒排氣之排出方向下游側的位置，設置有藉由從排氣處理部被導引來之燃燒排氣的熱而使供給至燃燒器之燃燒用空氣加熱的第二熱交換手段。 In the industrial furnace of the present invention, in order to solve the above-mentioned problems, fuel gas and combustion air are supplied to the burner, the fuel gas is burned in the furnace by the burner, and the combustion exhaust gas after the combustion is discharged from the burner. In an industrial furnace in which the inside of the furnace is discharged through an exhaust pipe: the exhaust pipe is provided with an exhaust treatment part that accommodates a ternary catalyst, and is located at a position closer to the upstream side in the discharge direction of the combustion exhaust gas than the exhaust treatment part. , is provided with a first heat exchange means for heating the combustion air supplied to the burner by the heat of the combustion exhaust gas, and is provided at a position closer to the downstream side in the discharge direction of the combustion exhaust gas than the exhaust gas treatment part There is a second heat exchange means for heating the combustion air supplied to the burner by the heat of the combustion exhaust gas guided from the exhaust gas treatment unit.

再者，在前述工業爐中，藉由收容在前述排氣處理部之三元觸媒，且藉由包含在燃燒排氣之未燃成分氣體使包含在燃燒排氣之NOx還原。此時，在對燃燒器供給燃料氣體及燃燒用空氣時，若使相對於燃料氣體之燃燒用空氣的量減少並將燃燒用空氣之空氣比μ設為1.0以下，在燃燒時產生之NOx的量會變少且包含在燃燒排氣之NOx會減少，進一步使包含在燃燒排氣之NOx藉由前述三元觸媒且利用包含在燃燒排氣之未燃成分氣體而充分地被還原。 Furthermore, in the above-mentioned industrial furnace, NOx contained in the combustion exhaust gas is reduced by the unburned component gas contained in the combustion exhaust gas by the ternary catalyst accommodated in the above-mentioned exhaust gas treatment part. At this time, when the fuel gas and combustion air are supplied to the burner, if the amount of the combustion air relative to the fuel gas is reduced and the air ratio μ of the combustion air is set to 1.0 or less, the amount of NOx generated during combustion will be reduced. The amount is reduced and the NOx contained in the combustion exhaust gas is reduced, and the NOx contained in the combustion exhaust gas is further sufficiently reduced by the ternary catalyst and the unburned component gas contained in the combustion exhaust gas.

再者，在本發明之工業爐中，在設置於比排氣處理部更靠近燃燒排氣之排出方向上游側之位置的第一熱交換手段中，藉由燃燒排氣之熱使供給至燃燒器之燃 燒用空氣加熱，並且在設置於比排氣處理部更靠近燃燒排氣之排出方向下游側之位置的第二熱交換手段中，藉由燃燒排氣之熱使供給至燃燒器之燃燒用空氣加熱。如上方式，在第一熱交換手段及第二熱交換手段中，供給至燃燒器之燃燒用空氣會藉由燃燒排氣之熱而充分地被加熱，且有效地利用燃燒排氣之熱。 Furthermore, in the industrial furnace of the present invention, in the first heat exchange means provided at the upstream side in the discharge direction of the combustion exhaust gas than the exhaust gas treatment section, the heat of the combustion exhaust gas is supplied to the combustion. fire The combustion air is heated, and the combustion air supplied to the burner is supplied to the burner by the heat of the combustion exhaust gas in the second heat exchange means provided at a position closer to the downstream side in the discharge direction of the combustion exhaust gas than the exhaust treatment section. heating. As described above, in the first heat exchange means and the second heat exchange means, the combustion air supplied to the burner is sufficiently heated by the heat of the combustion exhaust gas, and the heat of the combustion exhaust gas is effectively utilized.

在此，在前述之工業爐中，使前述第二熱交換手段中被加熱之燃燒用空氣導引至前述第一熱交換手段，且在該第一熱交換手段中，可藉由燃燒排氣之熱而使由第二熱交換手段導引之被加熱的燃燒用空氣再加熱，並供給至前述燃燒器。 Here, in the aforementioned industrial furnace, the combustion air heated in the second heat exchange means is guided to the first heat exchange means, and in the first heat exchange means, the combustion exhaust gas can be The heated combustion air guided by the second heat exchange means is reheated and supplied to the burner.

再者，在本發明之工業爐中，可在比前述排氣處理部更靠近燃燒排氣之排出方向上游側的位置，設置導引燃料氣體之燃料氣體導引路、及控制通過該燃料氣體導引路而導引之燃料氣體之量的控制手段。 Furthermore, in the industrial furnace of the present invention, a fuel gas guide path for guiding the fuel gas can be provided at a position closer to the upstream side in the discharge direction of the combustion exhaust gas than the exhaust gas treatment portion, and the passage of the fuel gas can be controlled. A means for controlling the amount of fuel gas guided by the guide path.

再者，在前述之控制手段中，對應於通過前述排氣處理部而排出之燃燒排氣所包含之氮氧化物的量，來控制通過燃料氣體導引路而導引之燃料氣體的量。 Furthermore, in the aforementioned control means, the amount of the fuel gas guided through the fuel gas guide passage is controlled in accordance with the amount of nitrogen oxides contained in the combustion exhaust gas discharged through the exhaust gas treatment portion.

在此，如前所述在對燃燒器供給燃料氣體及燃燒用空氣時，為了提升燃燒效率，在燃燒用空氣相對於燃料氣體之量變多的狀態下，藉由前述燃燒器使燃料氣體燃燒之結果，在燃燒排氣中包含大量NOx之情形時，在前述燃燒排氣通過排氣管而被導引至收容有三元觸媒之排氣處理部之前，藉由前述控制手段而通過燃料氣體導引路 供給適量之燃料氣體。如上方式，使包含大量之NOx之燃燒排氣及適量之燃料氣體會一起被導引至排氣處理部，且藉由前述三元觸媒之作用，而使燃燒排氣中之NOx充分地被還原而排出。 Here, when the fuel gas and the combustion air are supplied to the burner as described above, in order to improve the combustion efficiency, in a state where the amount of the combustion air relative to the fuel gas increases, the fuel gas is combusted by the burner. As a result, in the case where a large amount of NOx is contained in the combustion exhaust gas, before the combustion exhaust gas is guided through the exhaust pipe to the exhaust gas processing unit containing the ternary catalyst, the fuel gas is guided through the fuel gas by the control means. lead the way Supply an appropriate amount of fuel gas. In the above manner, the combustion exhaust gas containing a large amount of NOx and an appropriate amount of fuel gas are guided to the exhaust gas treatment part together, and the NOx in the combustion exhaust gas is sufficiently treated by the action of the aforementioned ternary catalyst. restored and discharged.

再者，在本發明之前述工業爐中，可在比設置於排氣管之排氣處理部更靠近燃燒排氣之排出方向下游側的位置，設置使包含在由排氣處理部所導引之燃燒排氣的未燃成分氣體燃燒的後燃燒裝置。如此，即使在排氣處理部中被處理之燃燒排氣中殘留有未燃成分氣體，該未燃成分氣體亦會藉由前述後燃燒裝置而被燃燒且被氧化成CO2或H2O，以防止未燃成分氣體被排出，並且如上所述藉由後燃燒裝置而被燃燒之燃燒排氣會被導引至前述第二熱交換手段，在該第二熱交換手段中，藉由後燃燒裝置而被燃燒之燃燒排氣的熱將供給至燃燒器之燃燒用空氣予以再充分加熱，且可更有效率地利用燃燒排氣之熱。 Furthermore, in the above-mentioned industrial furnace of the present invention, the exhaust gas treatment section provided in the exhaust pipe may be provided at a position closer to the downstream side in the discharge direction of the combustion exhaust gas so as to be included in the exhaust gas treatment section guided by the exhaust gas treatment section. A post-combustion device that combusts the unburned component gas of the combusted exhaust gas. In this way, even if unburned component gas remains in the combusted exhaust gas treated in the exhaust treatment section, the unburned component gas will be combusted and oxidized to CO 2 or H 2 O by the aforementioned post-combustion device, In order to prevent unburned component gas from being discharged, and the combustion exhaust gas burned by the post-combustion device as described above is guided to the aforementioned second heat exchange means, in the second heat exchange means, by post-combustion The heat of the combustion exhaust gas burned by the device will be sufficiently reheated by the combustion air supplied to the burner, and the heat of the combustion exhaust gas can be utilized more efficiently.

再者，在本發明之工業爐中，可設置複數個前述之燃燒器。 Furthermore, in the industrial furnace of the present invention, a plurality of the aforementioned burners may be provided.

再者，在本發明之其他工業爐中，在對燃燒器供給燃料氣體及燃燒用空氣，且藉由前述燃燒器使燃料氣體在爐內燃燒，並且使燃燒後之燃燒排氣從爐內通過排氣管而排出之工業爐中：在前述排氣管設置收容有三元觸媒之排氣處理部，並且在比前述排氣處理部更靠近燃燒排氣之排出方向上游側的位置，設置藉由燃燒排氣之熱而使供給至燃燒器之燃燒用空氣加熱的第一熱交換手段，另 一方面在比前述排氣處理部更靠近燃燒排氣之排出方向下游側的位置，設置藉由從排氣處理部導出之燃燒排氣的熱而使預備加熱帶之環境氣體加熱的第二熱交換手段，並且藉由該第二熱交換手段使預備加熱帶之環境氣體加熱並使之循環。如此，除了藉由燃燒排氣之熱而使供給至燃燒器之燃燒用空氣加熱之外，亦可使預備加熱帶之環境氣體加熱，而可有效地利用燃燒排氣之熱。 Furthermore, in another industrial furnace of the present invention, fuel gas and combustion air are supplied to the burner, the fuel gas is burned in the furnace by the burner, and the combustion exhaust gas after combustion is passed through the furnace. In an industrial furnace that is discharged through an exhaust pipe: an exhaust gas treatment part containing a ternary catalyst is provided in the exhaust pipe, and a borrower is provided at a position closer to the upstream side in the discharge direction of the combustion exhaust gas than the exhaust treatment part. The first heat exchange means for heating the combustion air supplied to the burner by the heat of the combustion exhaust gas, and the other On the one hand, a second heat source for heating the ambient gas in the preheating zone by the heat of the combustion exhaust gas led out from the exhaust treatment portion is provided at a position closer to the downstream side in the discharge direction of the combustion exhaust gas than the exhaust treatment portion. exchange means, and the ambient gas of the preparatory heating belt is heated and circulated by the second heat exchange means. In this way, in addition to heating the combustion air supplied to the burner by the heat of the combustion exhaust gas, the ambient air in the preheating zone can also be heated, so that the heat of the combustion exhaust gas can be effectively utilized.

在本發明之工業爐中，在對燃燒器供給至燃料氣體及燃燒用空氣，並使燃料氣體在爐內燃燒，且使燃燒後之燃燒排氣從爐內通過排氣管而排出時，如前所述在排氣管設置收容有三元觸媒之排氣處理部，並將前述燃燒排氣導引至前述排氣處理部，而適當地對燃燒排氣中之有害的NOx、及由CO氣體或碳化氫(HC)氣體等所構成之未燃成分氣體進行處理，並且在設置於比前述排氣處理部更靠近燃燒排氣之排出方向上游側之位置的第一熱交換手段中，利用導引至排氣處理部之燃燒排氣的熱，並使供給至燃燒器之燃燒用空氣加熱，又在設置於比排氣處理部更靠近燃燒排氣之排出方向下游側之位置的第二熱交換手段中，利用從排氣處理部排出之燃燒排氣的熱，使供給至燃燒器之燃燒用空氣、或預備加熱帶中之環境氣體加熱。 In the industrial furnace of the present invention, when fuel gas and combustion air are supplied to the burner, the fuel gas is burned in the furnace, and the combustion exhaust gas after combustion is discharged from the furnace through the exhaust pipe, such as As mentioned above, an exhaust gas treatment part containing a ternary catalyst is installed in the exhaust pipe, and the combustion exhaust gas is guided to the exhaust gas treatment part, and the harmful NOx and CO in the combustion exhaust gas are appropriately treated. Gas or unburned component gas composed of hydrocarbon (HC) gas, etc. is treated, and in the first heat exchange means provided at a position closer to the upstream side in the discharge direction of the combustion exhaust gas than the above-mentioned exhaust treatment part, using The heat of the combustion exhaust gas that is led to the exhaust treatment section is heated to the combustion air supplied to the burner, and is provided in the second section located on the downstream side in the discharge direction of the combustion exhaust gas than the exhaust treatment section. In the heat exchange means, the combustion air supplied to the burner or the ambient gas in the preheating zone is heated by the heat of the combustion exhaust gas discharged from the exhaust gas treatment part.

結果，在本發明之工業爐中，使燃料氣體與燃燒用空氣混合，且在爐內使燃料氣體燃燒時，燃燒排氣中之NOx或未燃成分氣體會在設置於排氣管之排氣處 理部中適當地被處理，且在燃燒排氣中並未包含有NOx或未燃成分氣體之安全狀態下，可使燃燒排氣通過排氣管而適當地排出至外部，並且在第一熱交換手段及第二熱交換手段中，藉由燃燒排氣之熱而將供給至燃燒器之燃燒用空氣或預備加熱帶之環境氣體予以充分地加熱，而可有效地利用燃燒排氣之熱。 As a result, in the industrial furnace of the present invention, when the fuel gas is mixed with the combustion air and the fuel gas is combusted in the furnace, NOx or unburned component gas in the combustion exhaust gas will be in the exhaust gas provided in the exhaust pipe. where It is properly treated in the management unit, and in a safe state where NOx or unburned component gas is not contained in the combustion exhaust gas, the combustion exhaust gas can be appropriately discharged to the outside through the exhaust pipe, and in the first heat In the exchange means and the second heat exchange means, the combustion air supplied to the burner or the ambient gas of the preheating zone is sufficiently heated by the heat of the combustion exhaust gas, so that the heat of the combustion exhaust gas can be effectively utilized.

10‧‧‧爐 10‧‧‧ Furnace

11‧‧‧爐壁 11‧‧‧Furnace Wall

12‧‧‧燃燒器 12‧‧‧burner

13‧‧‧排氣管 13‧‧‧Exhaust pipe

13a‧‧‧第一徑大部 13a‧‧‧Most of the first path

13b‧‧‧第二徑大部 13b‧‧‧Most of the second path

14‧‧‧煙囪 14‧‧‧Chimney

15‧‧‧預備加熱帶 15‧‧‧Preparing heating tape

16‧‧‧導引路 16‧‧‧Guiding Path

21‧‧‧燃料氣體供給管 21‧‧‧Fuel gas supply pipe

22‧‧‧燃燒用空氣供給管 22‧‧‧Air supply pipe for combustion

23‧‧‧排氣處理部 23‧‧‧Exhaust Treatment Department

24‧‧‧後燃燒裝置 24‧‧‧Afterburning device

24a‧‧‧後燃燒用燃料氣體供給管 24a‧‧‧Fuel gas supply pipe for post-combustion

24b‧‧‧後燃燒用空氣供給管 24b‧‧‧Air supply pipe for post-combustion

25‧‧‧燃料氣體導引路 25‧‧‧Fuel gas guide

25a‧‧‧控制閥(控制手段) 25a‧‧‧Control valve (control means)

31‧‧‧第一熱交換部(第一熱交換手段) 31‧‧‧First heat exchange part (first heat exchange means)

32‧‧‧第二熱交換部(第二熱交換手段) 32‧‧‧Second heat exchange part (second heat exchange means)

33、41‧‧‧送風裝置 33、41‧‧‧Air supply device

34‧‧‧燃燒用空氣導引管 34‧‧‧Air guide pipe for combustion

42‧‧‧環境氣體循環管 42‧‧‧Ambient gas circulation pipe

第1圖係顯示在本發明實施形態之工業爐中，使燃料氣體及燃燒用空氣混合，且將藉由燃燒器而使燃料氣體燃燒後之燃燒排氣通過排氣管而使之排出時，在前述排氣管從燃燒排氣之排出方向上游側依序設置第一熱交換部、排氣處理部及第二熱交換部之狀態的概略說明圖。 Fig. 1 shows that in an industrial furnace according to an embodiment of the present invention, fuel gas and combustion air are mixed, and the combustion exhaust gas after burning the fuel gas by the burner is discharged through the exhaust pipe, A schematic explanatory diagram of a state in which a first heat exchange part, an exhaust gas treatment part, and a second heat exchange part are sequentially provided in the exhaust pipe from the upstream side in the discharge direction of the combustion exhaust gas.

第2圖係顯示在前述實施形態之工業爐中，於前述排氣處理部與第二熱交換部之間，設置使包含在從排氣處理部導出之燃燒排氣的未燃成分氣體燃燒的後燃燒裝置的第一變更例的概略說明圖。 Fig. 2 shows that in the industrial furnace of the above-mentioned embodiment, between the exhaust gas treatment part and the second heat exchange part, a device for combusting the unburned component gas contained in the combustion exhaust gas led out from the exhaust gas treatment part is provided. A schematic explanatory diagram of a first modified example of the post-combustion device.

第3圖係顯示在前述實施形態之工業爐中，設置使供給至燃燒器之燃料氣體的一部分導引至比排氣處理部更靠近燃燒排氣之排出方向上游側之位置的燃料氣體導引路、及控制透過該燃料氣體導引路而導引之燃料氣體之量的控制手段，並且在排氣處理部與第二熱交換部之間設置使包含在由排氣處理部所導引之燃燒排氣的未燃成分氣體燃燒的後燃燒裝置的第二變更例的概略說明圖。 Fig. 3 shows that in the industrial furnace of the aforementioned embodiment, a fuel gas guide is provided to guide a part of the fuel gas supplied to the burner to a position upstream of the discharge direction of the combustion exhaust gas than the exhaust treatment section a passage, and a control means for controlling the amount of fuel gas guided through the fuel gas guide passage, and provided between the exhaust treatment part and the second heat exchange part so as to be included in the amount of the fuel gas guided by the exhaust treatment part A schematic explanatory diagram of a second modified example of the post-combustion device in which the unburned component gas of the combustion exhaust is combusted.

第4圖係顯示在本發明實施形態之工業爐中，在爐設置複數個燃燒器，使供給至各燃燒器之燃燒用空氣在第一熱交換部及第二熱交換部加熱之狀態的概略說明圖。 Fig. 4 is a schematic diagram showing a state in which a plurality of burners are installed in the furnace and the combustion air supplied to each burner is heated in the first heat exchange part and the second heat exchange part in the industrial furnace according to the embodiment of the present invention Illustrating.

第5圖係顯示本發明實施形態之其他工業爐中，將複數個燃燒器設置在爐，且以第一熱交換部使供給至各燃燒器之燃燒用空氣加熱，另一方面在第二熱交換部中使預備加熱帶的環境氣體加熱之狀態的概略說明圖。 Fig. 5 shows another industrial furnace according to an embodiment of the present invention, in which a plurality of burners are installed in the furnace, and the combustion air supplied to each burner is heated by the first heat exchange part, while the second heat is used to heat the combustion air supplied to each burner. A schematic explanatory diagram of the state in which the ambient gas of the preheating zone is heated in the exchange part.

以下，依據檢附圖式具體地說明本發明實施形態之工業爐。此外，本發明之工業爐並未限定在下述之實施形態者，在不變更本發明之要旨的範圍內，可適當地實施變更。 Hereinafter, an industrial furnace according to an embodiment of the present invention will be specifically described based on the drawings. In addition, the industrial furnace of this invention is not limited to the following embodiment, In the range which does not change the summary of this invention, a change can be implemented suitably.

在此，在第1圖所示之實施形態的工業爐中，於爐10之爐壁11設置燃燒器12，且使碳化氫(HC)氣體等燃料氣體通過燃料氣體供給管21而供給至該燃燒器12，並且在後述之第一熱交換手段31及第二熱交換手段32中，通過燃燒用空氣供給管22供給藉由燃燒排氣之熱而被加熱之燃燒用空氣，在該燃燒器12中使燃料氣體與被加熱之燃燒用空氣混合，且使燃料氣體在爐10內燃燒。 Here, in the industrial furnace of the embodiment shown in FIG. 1, a burner 12 is provided on the furnace wall 11 of the furnace 10, and fuel gas such as hydrocarbon (HC) gas is supplied to the furnace 10 through a fuel gas supply pipe 21. The burner 12 and the first heat exchange means 31 and the second heat exchange means 32 to be described later are supplied with the combustion air heated by the heat of the combustion exhaust gas through the combustion air supply pipe 22, and the burner In 12 , the fuel gas is mixed with the heated combustion air, and the fuel gas is burned in the furnace 10 .

然後，設置將如上所述使燃料氣體在爐10內燃燒後的燃燒排氣從爐10內排出的排氣管13，且在該排氣管13設置收容有三元觸媒之排氣處理部23，並使在爐10內燃燒後的燃燒排氣通過前述排氣管13而導引至該排氣處理部23，且藉由收容在排氣處理部23之三元觸媒 對燃燒排氣進行處理。 Then, an exhaust pipe 13 for discharging the combustion exhaust gas obtained by burning the fuel gas in the furnace 10 as described above is provided from the furnace 10, and the exhaust pipe 13 is provided with an exhaust gas treatment part 23 containing a ternary catalyst. , and the combustion exhaust gas after combustion in the furnace 10 is guided to the exhaust gas treatment part 23 through the aforementioned exhaust pipe 13 , and through the ternary catalyst accommodated in the exhaust gas treatment part 23 Treatment of combustion exhaust gas.

此外，在本實施形態之工業爐中，係在比排氣處理部23更靠近燃燒排氣之排出方向上游側的排氣管13內設置第一熱交換部31，以作為藉由燃燒排氣之熱而使燃燒用空氣加熱的第一熱交換手段31，並且在比排氣處理部23更靠近燃燒排氣之排出方向下游側的排氣管13內設置第二熱交換部32，以作為藉由燃燒排氣之熱而使燃燒用空氣加熱的第二熱交換手段32。此外，在該實施形態中，雖分別在排氣管13內設置第一熱交換部31及第二熱交換部32，但亦可在從排氣管13內取出之位置設置第一熱交換部31及第二熱交換部32。 In addition, in the industrial furnace of the present embodiment, the first heat exchange part 31 is provided in the exhaust pipe 13 on the upstream side in the discharge direction of the combustion exhaust gas than the exhaust gas treatment part 23, and serves as the exhaust gas by combustion The first heat exchange means 31 for heating the combustion air by the heat of the exhaust gas, and the second heat exchange part 32 is provided in the exhaust pipe 13 on the downstream side in the discharge direction of the combustion exhaust gas than the exhaust treatment part 23, as a The second heat exchange means 32 for heating the combustion air by the heat of the combustion exhaust gas. In addition, in this embodiment, although the first heat exchange part 31 and the second heat exchange part 32 are respectively provided in the exhaust pipe 13 , the first heat exchange part may be provided at the position taken out from the exhaust pipe 13 . 31 and the second heat exchange part 32 .

然後，在該實施形態中，藉由送風裝置33使燃燒用空氣通過燃燒用空氣導引管34而導引至前述第二熱交換部32，且在該第二熱交換部32中，藉由從排氣處理部23導出之燃燒排氣的熱而使燃燒用空氣加熱，並如前述方式通過排氣管13使經加熱燃燒用空氣後之燃燒排氣排出。 Then, in this embodiment, the combustion air is guided to the second heat exchange part 32 through the combustion air guide pipe 34 by the blower 33, and in the second heat exchange part 32, by The combustion air is heated by the heat of the combustion exhaust gas led out from the exhaust processing unit 23, and the combustion exhaust gas heated by the combustion air is discharged through the exhaust pipe 13 as described above.

再者，如前所述使在第二熱交換部32中被加熱之燃燒用空氣從第二熱交換部32通過下游側之燃燒用空氣導引管34而導引至前述第一熱交換部31，在該第一熱交換部31中，如前所述將被加熱之燃燒用空氣藉由要導引至排氣處理部23之前的燃燒排氣的熱予以再加熱，如此使經被加熱之燃燒用空氣通過前述燃燒用空氣供給管22供給至燃燒器12，如前所述使被加熱之燃燒用空氣與燃 料氣體混合，並使燃料氣體燃燒。 Furthermore, as described above, the combustion air heated in the second heat exchange portion 32 is guided from the second heat exchange portion 32 to the first heat exchange portion through the combustion air guide pipe 34 on the downstream side. 31. In the first heat exchange part 31, the heated combustion air is reheated by the heat of the combustion exhaust gas before it is guided to the exhaust gas treatment part 23 as described above, so that the heated air is heated. The combustion air is supplied to the burner 12 through the combustion air supply pipe 22, and the heated combustion air is mixed with the combustion air as described above. The fuel gas is mixed and the fuel gas is combusted.

如此，在第一熱交換部31及第二熱交換部32中，藉由燃燒排氣之熱而將燃燒用空氣予以充分地加熱，且在該狀態下，導引至燃燒器12而使燃料氣體燃燒，且可有效地利用燃燒排氣之熱，且在前述第一熱交換部31中在燃燒排氣與燃燒用空氣之間進行熱交換，且使從排氣管13要導引至前述的排氣處理部23之燃燒排氣的溫度降低，以防止燃燒排氣之溫度成為超過可供收容在排氣處理部23之三元觸媒發揮功能之溫度區域的溫度，且可藉由三元觸媒而適當地處理燃燒排氣。此外，可供三元觸媒發揮功能之溫度區域係為約400℃至800℃。 In this way, in the first heat exchange part 31 and the second heat exchange part 32, the combustion air is sufficiently heated by the heat of the combustion exhaust gas, and in this state, the combustion air is guided to the burner 12 to make the fuel The gas is combusted, and the heat of the combustion exhaust gas can be effectively used, and heat exchange is performed between the combustion exhaust gas and the combustion air in the first heat exchange part 31, and the exhaust pipe 13 is guided to the above-mentioned The temperature of the combustion exhaust gas in the exhaust gas treatment part 23 is lowered to prevent the temperature of the combustion exhaust gas from exceeding the temperature in the temperature region where the ternary catalyst accommodated in the exhaust gas treatment part 23 can function, and can be Combustion exhaust gas is properly treated as a meta-catalyst. In addition, the temperature range in which the ternary catalyst can function is about 400°C to 800°C.

在此，於前述工業爐中，通過前述燃料氣體供給管21及燃燒用空氣供給管22對燃燒器12供給燃料氣體及燃燒用空氣時，為了使在燃燒時發生之NOx的量減少，使相對於燃料氣體之燃燒用空氣的量減少，例如將燃燒用空氣之空氣比μ設為1.0以下，且在前述燃燒器12中使燃料氣體燃燒。 Here, in the industrial furnace, when the fuel gas and combustion air are supplied to the burner 12 through the fuel gas supply pipe 21 and the combustion air supply pipe 22, in order to reduce the amount of NOx generated during combustion, the relative The amount of combustion air in the fuel gas is reduced, for example, the air ratio μ of the combustion air is set to 1.0 or less, and the fuel gas is combusted in the above-mentioned burner 12 .

如此，使相對於燃料氣體之燃燒用空氣的量減少並使之燃燒時，包含在燃燒排氣之NOx會減少，並且CO氣體或碳化氫(HC)氣體等未燃成分氣體會殘留在在該燃燒排氣中。 In this way, when the amount of combustion air relative to the fuel gas is reduced and burned, the NOx contained in the combustion exhaust gas is reduced, and the unburned component gas such as CO gas and hydrocarbon (HC) gas remains in the combustion gas. in the combustion exhaust.

並且，如此當使NOx與未燃成分氣體殘留之燃燒排氣從爐10內通過前述排氣管13而導引至排氣處理部23時，藉由收容於該排氣處理部23之三元觸媒，殘 留在燃燒排氣之NOx與未燃成分氣體會反應，且NOx會還原成N2，並且使未燃成分氣體在氧化成CO2或H2O之狀態下被排出。 In addition, when the combustion exhaust gas containing the residual NOx and unburned component gas is guided from the furnace 10 through the exhaust pipe 13 to the exhaust gas treatment part 23, the ternary housed in the exhaust gas treatment part 23 As a catalyst, NOx remaining in the combustion exhaust gas reacts with unburned component gas, NOx is reduced to N 2 , and the unburned component gas is oxidized to CO 2 or H 2 O and discharged.

再者，如前所述藉由收容在排氣處理部23之三元觸媒對殘留有NOx與未燃成分氣體之燃燒排氣進行處理時，相對於燃料氣體之燃燒用空氣的量會變得更少，且燃燒排氣中之未燃成分氣體會變多，而會有無法藉由收容於排氣處理部23之三元觸媒充分地加以處理，使殘留有未燃成分氣體的燃燒排氣從排氣處理部23排出之疑虞。 Furthermore, as described above, when the combustion exhaust gas containing the residual NOx and unburned component gas is treated by the ternary catalyst accommodated in the exhaust gas treatment unit 23, the amount of combustion air relative to the fuel gas changes. In addition, the unburned component gas in the combustion exhaust gas will increase, and the ternary catalyst accommodated in the exhaust gas treatment unit 23 cannot be sufficiently treated, resulting in combustion of the unburned component gas remaining. There is a possibility that the exhaust gas is discharged from the exhaust processing unit 23 .

因此，在前述實施形態之工業爐中，如第2圖所示，在比設置於排氣管13之前述排氣處理部23更靠近燃燒排氣之排出方向下游側之位置設置後燃燒裝置24，而可對於該後燃燒裝置24，因應需要從後燃燒用燃料氣體供給管24a供給後燃燒用燃料氣體，並從後燃燒用空氣供給管24b供給後燃燒用空氣。 Therefore, in the industrial furnace of the above-described embodiment, as shown in FIG. 2, the post-combustion device 24 is provided at a position closer to the downstream side in the discharge direction of the combustion exhaust gas than the above-described exhaust treatment portion 23 provided in the exhaust pipe 13. , and the post-combustion device 24 may be supplied with the post-combustion fuel gas from the post-combustion fuel gas supply pipe 24a and supplied with the post-combustion air from the post-combustion air supply pipe 24b as required.

於是，於該工業爐中，使要從排氣處理部23排出之殘留在燃燒排氣的未燃成分氣體在前述後燃燒裝置24燃燒，並使未燃成分氣體氧化成CO2或H2O並使之排出。 Then, in the industrial furnace, the unburned component gas remaining in the combustion exhaust gas to be discharged from the exhaust gas treatment unit 23 is combusted in the post-combustion device 24, and the unburned component gas is oxidized to CO 2 or H 2 O and expel it.

因此，即使在前述排氣處理部23中未燃成分氣體未被充分地處理，而使殘留有未燃成分氣體的燃燒排氣從排氣處理部23排出時，該未燃成分氣體亦會在後燃燒裝置24燃燒而被處理，而可確實地防止未燃成分氣體被 排出。 Therefore, even when the unburned component gas is not sufficiently treated in the exhaust gas treatment unit 23, and the combustion exhaust gas with the unburned component gas remaining is discharged from the exhaust gas treatment unit 23, the unburned component gas remains in the exhaust gas treatment unit 23. The post-combustion device 24 is burnt and processed, so that the unburned component gas can be reliably prevented from being burned. discharge.

再者，如此藉由後燃燒裝置24而使燃燒排氣中之未燃成分氣體燃燒時，使藉由該後燃燒而被加熱的燃燒排氣被導引至前述第二熱交換部32，且藉由該後燃燒而被加熱的燃燒排氣，如前所述使導引至第二熱交換部32之燃燒用空氣被進一步地加熱，使藉由後燃燒而被加熱之燃燒排氣的熱亦被有效地利用。此外，在該實施形態中，雖利用藉由火焰而使殘留在燃燒排氣之未燃成分氣體燃燒的後燃燒裝置24，但後燃燒裝置24並不限定於該等者，亦可藉由電氣加熱等而使殘留在燃燒排氣之未燃成分氣體燃燒。 Furthermore, when the unburned component gas in the combustion exhaust gas is burned by the post-combustion device 24 in this way, the combustion exhaust gas heated by the post-combustion is guided to the second heat exchange portion 32, and The combustion exhaust gas heated by the post-combustion is further heated by the combustion air guided to the second heat exchange part 32 as described above, and the heat of the combustion exhaust gas heated by the post-combustion is further heated. are also used effectively. In addition, in this embodiment, although the post-combustion device 24 is used that burns the unburned component gas remaining in the combustion exhaust gas with a flame, the post-combustion device 24 is not limited to these, and an electrical The unburned component gas remaining in the combustion exhaust gas is burned by heating or the like.

再者，如前述所述在比排氣處理部23更靠近燃燒排氣之排出方向下游側的位置設置後燃燒装置24之工業爐中，如第3圖所示，亦可設置：將通過燃料氣體供給管21而供給至燃燒器12之燃料氣體的一部分，導引至比設於前述的排氣管13之排氣處理部23更靠近燃燒排氣之排出方向上游側之位置的燃料氣體導引路25；及用以控制通過該燃料氣體導引路25並供給至位於比排氣處理部23更靠近燃燒排氣之排出方向上游側的位置之排氣管13的燃料氣體之量的控制閥(控制手段)25a。 Furthermore, as described above, in the industrial furnace in which the post-combustion device 24 is provided at a position closer to the downstream side in the discharge direction of the combustion exhaust gas than the exhaust gas treatment unit 23, as shown in FIG. A part of the fuel gas supplied to the burner 12 from the gas supply pipe 21 is guided to the fuel gas guide located at a position on the upstream side in the discharge direction of the combustion exhaust gas than the exhaust treatment part 23 provided in the exhaust pipe 13 described above. A guide path 25; and control for controlling the amount of fuel gas that passes through the fuel gas guide path 25 and is supplied to the exhaust pipe 13 located at a position upstream of the exhaust gas treatment section 23 in the discharge direction of the combustion exhaust gas Valve (control means) 25a.

並且，在該工業爐中，對應於前述燃燒器12中被燃燒之後的燃燒排氣所含之NOx的量，藉由前述控制閥25a來控制通過燃料氣體導引路25而導引之燃料氣體的量。 In this industrial furnace, the fuel gas guided through the fuel gas guide passage 25 is controlled by the control valve 25a in accordance with the amount of NOx contained in the combustion exhaust gas after being burned in the burner 12. amount.

在此，如前所述在通過燃料氣體供給管21及燃燒用空氣供給管22而供給至燃燒器12之燃料氣體及燃燒用空氣時，使燃燒用空氣之量增多，例如空氣比μ超過1.0，使燃料氣體在前述燃燒器12燃燒之情形時，燃料氣體會藉由充分量之燃燒用空氣而被燃燒，且燃燒排氣中之CO氣體或碳化氫(HC)氣體等未燃成分氣體會減少，另一方面在燃燒時會產生大量的NOx，且在燃燒排氣中含有大量的NOx。 Here, when the fuel gas and combustion air are supplied to the burner 12 through the fuel gas supply pipe 21 and the combustion air supply pipe 22 as described above, the amount of the combustion air is increased, for example, the air ratio μ exceeds 1.0 , when the fuel gas is burned in the aforementioned burner 12, the fuel gas will be burned by a sufficient amount of combustion air, and the unburned component gases such as CO gas or hydrocarbon (HC) gas in the combustion exhaust gas will be On the other hand, a large amount of NOx is generated during combustion, and a large amount of NOx is contained in the combustion exhaust gas.

再者，如此在燃燒排氣中包含大量NOx時，藉由前述控制閥25a，控制通過前述燃料氣體導引路25而導引至比排氣處理部23更靠近燃燒排氣之排出方向上游側之位置的燃料氣體之量，並將適量之燃料氣體供給至比排氣處理部23更靠近燃燒排氣之排出方向上游側的位置，且使該燃料氣體與包含大量前述NOx之燃燒排氣一起導引至收容有三元觸媒之排氣處理部23。如此，燃燒排氣中之NOx係藉由收容於排氣處理部23之三元觸媒，與如前所述通過燃料氣體導引路25而被供給之燃料氣體反應而還原成N2。 In addition, when a large amount of NOx is contained in the combustion exhaust gas in this way, the control valve 25a controls the fuel gas guide passage 25 to guide the combustion exhaust gas to the upstream side in the discharge direction of the combustion exhaust gas rather than the exhaust treatment section 23. The amount of the fuel gas at the position is determined, and an appropriate amount of the fuel gas is supplied to a position closer to the upstream side in the discharge direction of the combustion exhaust gas than the exhaust treatment section 23, and the fuel gas is made to contain a large amount of the above-mentioned combustion exhaust gas of NOx. Guided to the exhaust gas treatment part 23 containing the ternary catalyst. In this way, NOx in the combustion exhaust gas is reduced to N 2 by the reaction with the fuel gas supplied through the fuel gas guide passage 25 as described above by the ternary catalyst accommodated in the exhaust gas treatment unit 23 .

此外，如此在通過燃料氣體導引路25供給燃料氣體之情形時，通過燃料氣體導引路25而導引至排氣處理部23之燃料氣體的量會變多，且使殘留有未燃成分氣體之燃燒排氣從排氣處理部23排出時，如前述所述藉由後燃燒裝置24而使從排氣處理部23排出之燃燒排氣中的未燃成分氣體燃燒，且在氧化成CO2或H2O之狀態下使之排 出。 In addition, when the fuel gas is supplied through the fuel gas guide path 25 as described above, the amount of the fuel gas guided through the fuel gas guide path 25 to the exhaust processing unit 23 increases and unburned components remain. When the gaseous combustion exhaust gas is discharged from the exhaust gas treatment unit 23, the unburned component gas in the combustion exhaust gas discharged from the exhaust gas treatment unit 23 is combusted by the post-combustion device 24 as described above, and is oxidized to CO. 2 or H 2 O to discharge it.

接著，針對在爐10設置複數個燃燒器12之第4圖所示之工業爐加以說明。 Next, an industrial furnace shown in FIG. 4 in which a plurality of burners 12 are installed in the furnace 10 will be described.

在此，於第4圖所示之工業爐中，分別通過燃料氣體供給管21來將碳化氫(HC)氣體等燃料氣體供給至各燃燒器12，並且與前述實施形態中之工業爐同樣地，在第一熱交換部31及第二熱交換部32中，使藉由燃燒排氣之熱而被加熱之燃燒用空氣通過燃燒用空氣導引管34而導引至各燃燒器12之燃燒用空氣供給管22，且將通過各燃燒用空氣供給管22而被加熱之燃燒用空氣供給至各燃燒器12並使燃料氣體，將如上方式燃燒後之燃燒排氣從爐10內導引至排氣管13。 Here, in the industrial furnace shown in FIG. 4, fuel gas such as hydrocarbon (HC) gas is supplied to each burner 12 through fuel gas supply pipes 21, respectively, and it is the same as the industrial furnace in the aforementioned embodiment. In the first heat exchange part 31 and the second heat exchange part 32, the combustion air heated by the heat of the combustion exhaust gas is guided to the combustion of each burner 12 through the combustion air guide pipe 34 Using the air supply pipe 22, the combustion air heated by each combustion air supply pipe 22 is supplied to each burner 12 and the fuel gas is supplied, and the combustion exhaust gas burned in the above manner is guided from the inside of the furnace 10 to the furnace 10. Exhaust pipe 13.

並且，在該工業爐中，在導引有燃燒排氣之排氣管13設置直徑變大之第一徑大部13a，並且設置藉由導引至該第一徑大部13a內之燃燒排氣的熱而使燃燒用空氣加熱之第一熱交換部31。 In addition, in this industrial furnace, a first large diameter portion 13a having a larger diameter is provided in the exhaust pipe 13 in which the combustion exhaust gas is guided, and a combustion exhaust gas guided to the inside of the first large diameter portion 13a is provided. The first heat exchange part 31 that heats the combustion air by the heat of the air.

再者，在該第一徑大部13a與收容有三元觸媒之排氣處理部23之間的前述排氣管13，設置導引燃料氣體之燃料氣體導引路25，並且設置用以控制通過該燃料氣體導引路25而供給至排氣管13之燃料氣體之量的控制閥25a，且與在前述各燃燒器12中被燃燒後的燃燒排氣所含之NOx的量對應，並藉由前述控制閥25a來控制通過燃料氣體導引路25而導引之燃料氣體的量。 Furthermore, in the aforementioned exhaust pipe 13 between the first diameter portion 13a and the exhaust treatment portion 23 containing the ternary catalyst, a fuel gas guide path 25 for guiding the fuel gas is provided, and a fuel gas guide path 25 for controlling the fuel gas is provided. The control valve 25a for the amount of fuel gas supplied to the exhaust pipe 13 through the fuel gas guide passage 25 corresponds to the amount of NOx contained in the combustion exhaust gas after being combusted in the respective burners 12, and The amount of the fuel gas guided through the fuel gas guide passage 25 is controlled by the aforementioned control valve 25a.

再者，在燃燒排氣中包含大量NOx之情形 時，藉由前述控制閥25a來控制如前所述通過燃料氣體導引路25而導引至比排氣處理部23更靠近燃燒排氣之排出方向上游側之位置的燃料氣體之量，並且將適量之燃料氣體供給至比排氣處理部23更靠近燃燒排氣之排出方向上游側的位置，且使該燃料氣體與包含大量前述之NOx的燃燒排氣一起導引至收容有三元觸媒的排氣處理部23，且在該排氣處理部23中，使燃燒排氣中之NOx與前述燃料氣體反應而還原成N2。 Furthermore, in the case where a large amount of NOx is contained in the combustion exhaust gas, the control valve 25a controls the fuel gas to be guided through the fuel gas guide path 25 to be closer to the combustion exhaust gas than the exhaust treatment section 23 as described above. The amount of fuel gas at the position on the upstream side in the discharge direction, and an appropriate amount of fuel gas is supplied to the position on the upstream side in the discharge direction of the combustion exhaust gas than the exhaust treatment section 23, and the fuel gas and the above-mentioned NOx are contained in a large amount. The combusted exhaust gas is guided to the exhaust gas treatment part 23 containing the ternary catalyst, and in the exhaust gas treatment part 23, the NOx in the combustion exhaust gas is reacted with the aforementioned fuel gas to be reduced to N 2 .

再者，在比前述排氣處理部23更靠近燃燒排氣之排出方向下游側的位置之排氣管13設置後燃燒裝置24，且對於該後燃燒裝置24，因應需要從後燃燒用燃料氣體供給管24a供給後燃燒用燃料氣體，並從後燃燒用空氣供給管24b供給後燃燒用空氣。 Furthermore, a post-combustion device 24 is provided in the exhaust pipe 13 at a position closer to the downstream side in the discharge direction of the combustion exhaust gas than the aforementioned exhaust treatment portion 23, and the post-combustion device 24 is provided with a fuel gas for post-combustion as required. 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.

於是，在要從前述排氣處理部23所排出之燃燒排氣殘留有CO氣體或碳化氫(HC)氣體等之未燃成分氣體之情形時，使該未燃成分氣體如前所述在後燃燒裝置24中燃燒，而氧化成CO2或H2O。 Therefore, in the case where unburned component gas such as CO gas or hydrocarbon (HC) gas remains in the combustion exhaust gas to be discharged from the exhaust gas treatment unit 23, the unburned component gas is made to follow as described above. It burns in the combustion device 24 and is oxidized to CO 2 or H 2 O.

再者，在該工業爐中，在比前述後燃燒裝置24更靠近燃燒排氣之排出方向下游側中的排氣管13設置直徑變大的第二徑大部13b，且設置藉由導引至該第二徑大部13b內之燃燒排氣的熱而使燃燒用空氣加熱的第二熱交換部32。 Furthermore, in this industrial furnace, the exhaust pipe 13 on the downstream side in the discharge direction of the combustion exhaust gas is provided with a second large diameter portion 13b having a larger diameter than the aforementioned post-combustion device 24, and is provided by the guide. The second heat exchange portion 32 that heats the combustion air by the heat of the combustion exhaust gas in the second diameter large portion 13b.

在此，於該工業爐中，與前述工業爐同樣地，藉由送風裝置33而使燃燒用空氣通過燃燒用空氣導引 管34而導引至前述第二熱交換部32，且在該第二熱交換部32中，藉由從排氣處理部23導出之燃燒排氣或在前述之後燃燒裝置24燃燒後之燃燒排氣的熱而使燃燒用空氣加熱，將如上方式被加熱之燃燒用空氣從第二熱交換部32通過燃燒用空氣導引管34而導引至前述第一熱交換部31，在該第一熱交換部31中，藉由要導引至排氣處理部23之前的燃燒排氣之熱使如前所述被加熱之燃燒用空氣再進一步加熱。 Here, in this industrial furnace, similarly to the above-mentioned industrial furnace, the combustion air is guided by the combustion air by the blower 33 The pipe 34 is led to the second heat exchange part 32, and in the second heat exchange part 32, the combustion exhaust gas led out from the exhaust gas treatment part 23 or the combustion exhaust gas after the combustion of the after-burning device 24 is used. The combustion air is heated by the heat of the air, and the combustion air heated as described above is guided from the second heat exchange part 32 through the combustion air guide pipe 34 to the first heat exchange part 31, where the first heat exchange part 31 is located. In the heat exchange part 31 , the combustion air heated as described above is further heated by the heat of the combustion exhaust gas before being guided to the exhaust gas treatment part 23 .

於是，如此使第一熱交換部31中被加熱之燃燒用空氣從前述燃燒用空氣導引管34通過各燃燒用空氣供給管22而供給至各燃燒器12，在各燃燒器12中，使如前所述被加熱之燃燒用空氣與燃料氣體混合，並使燃料氣體燃燒。 Then, the combustion air heated in the first heat exchange part 31 is supplied to each burner 12 from the aforementioned combustion air guide pipe 34 through each combustion air supply pipe 22, and in each burner 12, the The combustion air heated as described above is mixed with the fuel gas, and the fuel gas is combusted.

另一方面，在前述第二徑大部13b中之第二熱交換部32中使燃燒用空氣加熱之後的燃燒排氣，係使之通過前述排氣管13而從煙囪14排出。 On the other hand, the combustion exhaust gas heated by the combustion air in the second heat exchange portion 32 of the second large diameter portion 13b is discharged from the chimney 14 through the exhaust pipe 13 .

接著，針對在爐10設置複數個燃燒器12之第5圖所示之工業爐加以說明。此外，第5圖所示之工業爐係存在多數個與前述第4圖所示之工業爐一致之點，因此以與第4圖所示之工業爐不同之點為中心加以說明。 Next, an industrial furnace shown in FIG. 5 in which a plurality of burners 12 are provided in the furnace 10 will be described. In addition, since the industrial furnace shown in FIG. 5 has many points in agreement with the industrial furnace shown in the above-mentioned FIG. 4, the point which differs from the industrial furnace shown in FIG. 4 will be mainly demonstrated.

在此，在第5圖所示之工業爐中，與第4圖所示之工業爐同樣地，在導引爐10內被燃燒後之燃燒排氣的排氣管13設置直徑變大的第一徑大部13a，且設置藉由導引至該第一徑大部13a內之燃燒排氣的熱而使燃燒用 空氣加熱的第一熱交換部31。並且，在該工業爐中，對於該第一熱交換部31，藉由送風裝置33通過燃燒用空氣導引管34送入燃燒用空氣，且使在該第一熱交換部31中被加熱之燃燒用空氣通過燃燒用空氣導引管34而導引至各燃燒器12之燃燒用空氣供給管22。 Here, in the industrial furnace shown in FIG. 5, similarly to the industrial furnace shown in FIG. 4, the exhaust pipe 13 that guides the combustion exhaust gas after being burned in the furnace 10 is provided with a second larger diameter. A large diameter portion 13a is provided for combustion by the heat of the combustion exhaust gas guided into the first large diameter portion 13a Air-heated first heat exchange portion 31 . Furthermore, in the industrial furnace, the first heat exchange part 31 is supplied with combustion air through the combustion air guide pipe 34 by the blower 33, and the air heated in the first heat exchange part 31 is made to be heated. The combustion air is guided to the combustion air supply pipe 22 of each burner 12 through the combustion air guide pipe 34 .

再者，在第5圖所示之工業爐中，與第4圖所示之工業爐同樣地，在設置有第一熱交換部31之第一徑大部13a和收容有三元觸媒之排氣處理部23之間的前述排氣管13，設置導引燃料氣體的燃料氣體導引路25，並且設置用以控制通過該燃料氣體導引路25供給至排氣管13之燃料氣體之量的控制閥25a，且與包含在前述各燃燒器12中燃燒後之燃燒排氣的NOx之量相對應，藉由前述控制閥25a來控制通過燃料氣體導引路25而導引之燃料氣體的量。 In addition, in the industrial furnace shown in FIG. 5, similarly to the industrial furnace shown in FIG. 4, the first diameter large part 13a provided with the first heat exchange part 31 and the row containing the ternary catalyst are provided. The aforementioned exhaust pipe 13 between the gas treatment parts 23 is provided with a fuel gas guide path 25 for guiding the fuel gas, and is provided for controlling the amount of fuel gas supplied to the exhaust pipe 13 through the fuel gas guide path 25 The control valve 25a is controlled by the control valve 25a, and the amount of the fuel gas guided through the fuel gas guide path 25 is controlled by the control valve 25a corresponding to the amount of NOx contained in the combustion exhaust gas after combustion in each of the burners 12. quantity.

並且，在燃燒排氣中包含大量NOx之情形時，如前所述藉由控制閥25a來控制通過燃料氣體導引路25而導引至比排氣處理部23更靠近燃燒排氣之排出方向上游側之位置的燃料氣體之量，並將適量之燃料氣體供給至比排氣處理部23更靠近燃燒排氣之排出方向上游側的位置，且使該燃料氣體與包含大量前述NOx之燃燒排氣一起導引至收容有三元觸媒之排氣處理部23，且在該排氣處理部23中，使燃燒排氣中之NOx與前述燃料氣體反應，而還原成N2。 In addition, when a large amount of NOx is contained in the combustion exhaust gas, the control valve 25a is used to control the fuel gas guide passage 25 to guide the combustion exhaust gas closer to the discharge direction of the combustion exhaust gas than the exhaust treatment unit 23 as described above. The amount of fuel gas at the position on the upstream side, and an appropriate amount of fuel gas is supplied to a position closer to the upstream side in the discharge direction of the combustion exhaust gas than the exhaust treatment section 23, and the fuel gas is mixed with the combustion exhaust gas containing a large amount of the aforementioned NOx. The gas is led together to the exhaust treatment part 23 containing the ternary catalyst, and in the exhaust treatment part 23, NOx in the combustion exhaust gas is reacted with the aforementioned fuel gas to be reduced to N 2 .

此外，在比前述排氣處理部23更靠近燃燒 排氣之排出方向下游側之位置的排氣管13設置後燃燒裝置24，且對於該後燃燒裝置24，因應需要從後燃燒用燃料氣體供給管24a供給後燃燒用燃料氣體，並從後燃燒用空氣供給管24b供給後燃燒用空氣，且在從前述排氣處理部23排出之燃燒排氣殘留有CO氣體或碳化氫(HC)氣體等未燃成分氣體時，使該未燃成分氣體如前所述在後燃燒裝置24中燃燒，而氧化成CO2或H2O。 Further, a post-combustion device 24 is provided in the exhaust pipe 13 at a position closer to the downstream side in the discharge direction of the combustion exhaust gas than the aforementioned exhaust treatment portion 23, and the post-combustion device 24 is supplied from the post-combustion fuel gas as necessary The post-combustion fuel gas is supplied from the pipe 24a, and the post-combustion air is supplied from the post-combustion air supply pipe 24b, and CO gas, hydrocarbon (HC) gas, etc. remain in the combustion exhaust gas discharged from the exhaust gas treatment unit 23. In the case of unburned component gas, the unburned component gas is combusted in the post-combustion device 24 as described above, and is oxidized to CO 2 or H 2 O.

在此，於該工業爐中，與第4圖所示之工業爐同樣地，在比後燃燒裝置24更靠近燃燒排氣之排出方向下游側的排氣管13設置直徑變大之第二徑大部13b，且在該第二徑大部13b內設置第二熱交換部32。 Here, in this industrial furnace, as in the industrial furnace shown in FIG. 4 , a second diameter 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 The large part 13b, and the second heat exchange part 32 is provided in the second diameter large part 13b.

另一方面，在第5圖所示之工業爐中，為了連續地處理鋼帶等長形狀之處理物(未圖示)，係設置成透過前述爐10及導引路16而讓用以預備加熱前述處理物之預備加熱帶15相連通。 On the other hand, in the industrial furnace shown in FIG. 5, in order to continuously process long-shaped processed objects (not shown) such as steel strips, it is installed so as to pass through the furnace 10 and the guide path 16 for preparation. The preparatory heating belt 15 for heating the above-mentioned treatment object is connected.

再者，在該工業爐中，藉由送風裝置41使前述預備加熱帶15內之環境氣體通過環境氣體循環管42而導引至前述第二熱交換部32，在該第二熱交換部32中，利用來自前述第二徑大部13b所導引之排氣處理部23之燃燒排氣的熱或由前述後燃燒裝置24進行後燃燒後之燃燒排氣的熱，使前述環境氣體加熱，並且使如上方式加熱之環境氣體通過環境氣體循環管42而回到預備加熱帶15內，使預備加熱帶15內之環境氣體在第二熱交換部32加熱並使之循環，如上方式在第二熱交換部32使環境氣體加 熱之後的燃燒排氣通過前述排氣管13而從煙囪(未圖示)排出。 Furthermore, in the industrial furnace, the ambient gas in the preheating zone 15 is guided to the second heat exchange part 32 by the air supply device 41 through the ambient gas circulation pipe 42, where the second heat exchange part 32 In the process, the ambient gas is heated by the heat of the combustion exhaust gas from the exhaust treatment part 23 guided by the second diameter large part 13b or the heat of the combustion exhaust gas after post-combustion by the post-combustion device 24. And the ambient gas heated in the above manner is returned to the preparatory heating zone 15 through the ambient gas circulation pipe 42, and the ambient gas in the preparatory heating zone 15 is heated and circulated in the second heat exchange part 32, in the second heat exchange part 32 in the above manner. The heat exchange part 32 adds ambient gas to the The heated combustion exhaust gas is discharged from a chimney (not shown) through the aforementioned exhaust pipe 13 .

此外，在前述第一及第二工業爐1中，如第3圖所示之工業爐1，設置有：用以將通過燃料氣體供給管21供給至燃燒器部12之燃料氣體的一部分導引至比前述排氣處理部23更靠近燃燒排氣之排出方向上游側之位置的燃料氣體導引路25；以及用以控制通過該燃料氣體導引路25而導引至比排氣處理部23更靠近燃燒排氣之排出方向上游側之位置的燃料氣體之量的控制閥25a；並且，在導引從各排氣處理部23排出之燃燒排氣的排氣管13設置後燃燒裝置24，但不一定要設置上述構件。 In addition, among the first and second industrial furnaces 1, the industrial furnace 1 shown in FIG. 3 is provided with a guide for guiding a part of the fuel gas supplied to the burner portion 12 through the fuel gas supply pipe 21 a fuel gas guide path 25 to a position closer to the upstream side in the discharge direction of the combustion exhaust gas than the aforementioned exhaust treatment part 23; A control valve 25a for controlling the amount of fuel gas at a position closer to the upstream side in the discharge direction of the combustion exhaust gas; and a post-combustion device 24 is provided in the exhaust pipe 13 that guides the combustion exhaust gas discharged from each exhaust processing unit 23, However, it is not necessary to provide the above-mentioned components.

10‧‧‧爐 10‧‧‧ Furnace

11‧‧‧爐壁 11‧‧‧Furnace Wall

12‧‧‧燃燒器 12‧‧‧burner

13‧‧‧排氣管 13‧‧‧Exhaust pipe

21‧‧‧燃料氣體供給管 21‧‧‧Fuel gas supply pipe

22‧‧‧燃燒用空氣供給管 22‧‧‧Air supply pipe for combustion

23‧‧‧排氣處理部 23‧‧‧Exhaust Treatment Department

31‧‧‧第一熱交換部(第一熱交換手段) 31‧‧‧First heat exchange part (first heat exchange means)

32‧‧‧第二熱交換部(第二熱交換手段) 32‧‧‧Second heat exchange part (second heat exchange means)

33‧‧‧送風裝置 33‧‧‧Air supply device

34‧‧‧燃燒用空氣導引管 34‧‧‧Air guide pipe for combustion

Claims (4)

一種工業爐，係對燃燒器供給燃料氣體及燃燒用空氣，並藉由前述燃燒器使燃料氣體在爐內燃燒，且使燃燒後之燃燒排氣從爐內通過排氣管而排出者；其中在前述排氣管設置收容有三元觸媒之排氣處理部，並且在比前述排氣處理部更靠近燃燒排氣之排出方向上游側的位置，設置有藉由燃燒排氣之熱而使供給至燃燒器之燃燒用空氣加熱的第一熱交換手段，又在比前述排氣處理部更靠近燃燒排氣之排出方向下游側的位置，設置有藉由從排氣處理部被導引來之燃燒排氣的熱而使供給至燃燒器之燃燒用空氣加熱的第二熱交換手段，且在比前述排氣處理部更靠近燃燒排氣之排出方向上游側的位置，設置有導引燃料氣體之燃料氣體導引路、及控制通過該燃料氣體導引路而導引之燃料氣體之量的控制手段。 An industrial furnace, which supplies fuel gas and combustion air to a burner, burns the fuel gas in the furnace by the aforementioned burner, and discharges the combustion exhaust gas after combustion from the furnace through an exhaust pipe; wherein An exhaust gas treatment part containing a ternary catalyst is provided in the exhaust pipe, and at a position closer to the upstream side in the discharge direction of the combustion exhaust gas than the exhaust gas treatment part, a supply is provided by the heat of the combustion exhaust gas. The first heat exchange means for heating the combustion air to the burner is provided at a position closer to the downstream side in the discharge direction of the combustion exhaust gas than the aforementioned exhaust gas treatment section, by means of a heat exchange device guided from the exhaust gas treatment section. The second heat exchange means for heating the combustion air supplied to the burner by combusting the heat of the exhaust gas is provided with a guide fuel gas at a position closer to the upstream side in the discharge direction of the combustion exhaust gas than the exhaust gas treatment section. A fuel gas guide path, and a control means for controlling the amount of fuel gas guided through the fuel gas guide path. 如申請專利範圍第1項所述之工業爐，其中，在前述排氣處理部與前述第二熱交換手段之間，設置有使包含在從前述排氣處理部所排出之燃燒排氣的未燃成分氣體燃燒的後燃燒裝置。 The industrial furnace according to claim 1, wherein between the exhaust gas treatment part and the second heat exchange means, there is provided a non-condensed exhaust gas which is contained in the combustion exhaust gas discharged from the exhaust gas treatment part. A post-combustion device for the combustion of the combustion component gas. 如申請專利範圍第1項或第2項所述之工業爐，其中，將藉由前述第二熱交換手段加熱後之燃燒用空氣導引至前述第一熱交換手段，且在該第一熱交換手段中，藉由燃燒排氣之熱而使由第二熱交換手段導引來之被加 熱的燃燒用空氣進一步加熱，並供給至前述燃燒器，而藉由收容在前述排氣處理部之三元觸媒，並藉由包含在燃燒排氣之未燃成分氣體使包含在燃燒排氣的氮氧化物還原。 The industrial furnace according to claim 1 or claim 2, wherein the combustion air heated by the second heat exchanging means is guided to the first heat exchanging means, and in the first heat exchanging means In the exchange means, by the heat of the combustion exhaust gas, the heat introduced by the second heat exchange means is added. The hot combustion air is further heated and supplied to the burner, and the unburned component gas contained in the combustion exhaust gas is made to be contained in the combustion exhaust gas by the ternary catalyst accommodated in the exhaust gas treatment part. reduction of nitrogen oxides. 如申請專利範圍第1項或第2項所述之工業爐，係設置有複數個前述燃燒器。 The industrial furnace described in claim 1 or claim 2 is provided with a plurality of the aforementioned burners.
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CN108700293A (en) 2018-10-23

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