TWI686570B - Industrial furnace - Google Patents

Industrial furnace Download PDF

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TWI686570B
TWI686570B TW106105055A TW106105055A TWI686570B TW I686570 B TWI686570 B TW I686570B TW 106105055 A TW106105055 A TW 106105055A TW 106105055 A TW106105055 A TW 106105055A TW I686570 B TWI686570 B TW I686570B
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combustion
exhaust gas
gas
fuel gas
furnace
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TW106105055A
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Chinese (zh)
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TW201734365A (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
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
    • F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
    • 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
    • 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
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chimneys And Flues (AREA)
  • Air Supply (AREA)
  • Combustion Of Fluid Fuel (AREA)

Abstract

This invention provides an industrial furnace that supplies fuel gas and combustion air to a combustion burner, makes the fuel gas combusting in the furnace by the combustion burner, and discharges combustion exhaust gas after combustion from the furnace via an exhaust pipe, wherein an exhaust gas treatment portion accommodating a three-way catalyst is provided in the exhaust pipe.

Description

工業爐 Industrial furnace

本發明係關於一種工業爐，其係將燃料氣體及燃燒用空氣供給至燃燒器，藉由前述之燃燒器使燃料氣體在爐內燃燒，使燃燒後之燃燒廢氣從爐內經由排氣管而排出者。尤其，本發明之特徵在於，如前述般將燃料氣體及燃燒用空氣供給至燃燒器中，藉由燃燒器使燃料氣體在爐內燃燒時，在燃燒廢氣中含有有害的氮氧化物(以下稱為NOx)、及CO氣體或碳氫化合物氣體(HC)等之未燃成分氣體的狀態下，防止燃燒廢氣經由排氣管排出至外部。 The present invention relates to an industrial furnace which supplies fuel gas and combustion air to a burner, burns fuel gas in the furnace by the aforementioned burner, and burns combustion exhaust gas from the furnace through an exhaust pipe Ejector. In particular, the present invention is characterized in that fuel gas and combustion air are supplied to the burner as described above, and when the fuel gas is burned in the furnace by the burner, the combustion exhaust gas contains harmful nitrogen oxides (hereinafter referred to as In the state of NOx) and unburned component gas such as CO gas or hydrocarbon gas (HC), the combustion exhaust gas is prevented from being discharged to the outside through the exhaust pipe.

以往至今，加熱爐、熱處理爐等之工業爐中，當使被加熱物加熱時，一般係將燃料氣體及燃燒用空氣供給至燃燒器，藉由前述之燃燒器使燃料氣體在爐內燃燒，使燃燒後之燃燒廢氣從爐內經由排氣管而排出。 Conventionally, in industrial furnaces such as heating furnaces and heat treatment furnaces, when the object to be heated is heated, fuel gas and combustion air are generally supplied to the burner, and the fuel gas is burned in the furnace by the aforementioned burner. The combustion exhaust gas after combustion is discharged from the furnace through the exhaust pipe.

在此，在如此之工業爐中，如前述般將燃料氣體及燃燒用空氣供給至燃燒器，使燃料氣體在爐內燃燒時，為了提高燃燒效率，若增加相對於燃料氣體之燃燒用空氣量而進行燃燒，燃燒時會產生大量NOx，而含有大量NOx之燃燒廢氣會從爐內經由排氣管而排出至外部，有 使環境嚴重受害之問題。特別是，近年來期望大幅減少燃燒廢氣中之NOx。 Here, in such an industrial furnace, when the fuel gas and the 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, if the amount of combustion air relative to the fuel gas is increased When burning, a large amount of NOx will be generated during combustion, and the combustion exhaust gas containing a large amount of NOx will be discharged from the furnace through the exhaust pipe to the outside. The problem of serious damage to the environment. In particular, in recent years, it has been desired to significantly reduce NOx in combustion exhaust gas.

另一方面，為了抑制燃燒廢氣中含有NOx，若減少相對於燃料氣體之燃燒用空氣之量而進行燃燒，則燃燒效率會降低，同時燃燒廢氣中會殘留許多CO氣體、碳氫化合物(HC)氣體等之未燃成分氣體，該未燃成分氣體從爐內經由排氣管而排出至外部，而在安全性、環境方面造成問題。 On the other hand, in order to suppress the NOx contained in the combustion exhaust gas, if the amount of combustion air relative to the fuel gas is reduced and the combustion is performed, the combustion efficiency will decrease, and at the same time, a lot of CO gas and hydrocarbon (HC) will remain in the combustion exhaust gas Unburned component gas such as gas, which is discharged from the furnace to the outside through the exhaust pipe, causes problems in terms of safety and environment.

繼而，近年來，如專利文獻1所示，已提出一種將來自輻射管燃燒器之燃燒廢氣使用氮氧化物還原觸媒而淨化，在所得之NOx淨化氣體中以空氣比μ(實際之空氣量/理論空氣量)成為1.0以上之方式添加燃燒用空氣之後，進一步使用氧化觸媒使未燃成分氧化除去者。 Then, in recent years, as shown in Patent Document 1, a method for purifying combustion exhaust gas from a radiant tube burner using a nitrogen oxide reduction catalyst has been proposed. In the resulting NOx purification gas, an air ratio μ (actual amount of air /Theoretical air volume) After the combustion air is added so that it becomes 1.0 or more, an oxidation catalyst is used to further oxidize and remove unburned components.

在此，如專利文獻1所示者之中，必須設置有：收容氮氧化物還原觸媒之第1廢氣處理部；及，收容氧化觸媒之第2廢氣處理部且在該第1廢氣處理部及第2廢氣處理部之間供給空氣，有使裝置變複雜而大型化等之問題。 Here, as shown in Patent Document 1, it is necessary to provide: a first exhaust gas treatment section that houses a nitrogen oxide reduction catalyst; and, a second exhaust gas treatment section that houses an oxidation catalyst and process the first exhaust gas There is a problem that the air is supplied between the unit and the second exhaust gas treatment unit, which complicates and enlarges the device.

又，就廢氣處理之其中一而言，已知一種藉由三元觸媒而使對安全、環境、人體等造成不良影響之CO、HC、NOx進行氧化/還原，轉化成H2O、CO2、N2而淨化者，例如專利文獻2所示，已提出一種具有蓄熱層之交換燃燒器中，在各燃燒器部之蓄熱層設置三元觸媒層，並為了符合三元觸媒層之活性條件，將爐內空氣比調整至 0.98至1.02而使其燃燒者。 In addition, as one of exhaust gas treatments, it is known that CO, HC, and NOx, which cause adverse effects on safety, environment, human body, etc., are oxidized/reduced to H 2 O, CO by a ternary catalyst 2, N 2 and purified by, for example, Patent Document 2 has been proposed having a combustor exchanger in the thermal storage layer provided on the heat storage layer three-way catalytic layer of each portion of the burner, and in order to comply with three-way catalytic layer For the active conditions, adjust the air ratio in the furnace to 0.98 to 1.02 to burn it.

但，如專利文獻2所示者，其使用之爐的種類、使用條件受到限制，難以在各種爐中以各種的條件下使用。 However, as shown in Patent Document 2, the types and operating conditions of furnaces used are limited, and it is difficult to use them under various conditions in various furnaces.

[先前技術文獻] [Prior Technical 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 Laid-Open No. 7-133905

本發明之課題在於解決將燃料氣體及燃燒用空氣供給至燃燒器，藉由前述之燃燒器使燃料氣體在爐內燃燒，使燃燒後之燃燒廢氣從爐內經由排氣管而排出之工業爐中如前述的問題。 The object of the present invention is to solve the industrial furnace that supplies fuel gas and combustion air to the burner, burns the fuel gas in the furnace by the aforementioned burner, and discharges the burned combustion exhaust gas from the furnace through the exhaust pipe As mentioned above.

亦即，本發明之工業爐中，課題在於將燃料氣體及燃燒用空氣供給至燃燒器，藉由燃燒器使燃料氣體在爐內燃燒後，使燃燒廢氣從爐內經由排氣管而排出時，在燃燒廢氣中含有有害的NOx、及CO氣體或碳氫化合物氣體(HC)等之未燃成分氣體的狀態下，適當地防止燃燒廢氣排出至外部。 That is, in the industrial furnace of the present invention, the problem is to supply fuel gas and combustion air to the burner, after the fuel gas is burned in the furnace by the burner, and the combustion exhaust gas is discharged from the furnace through the exhaust pipe In a state where the combustion exhaust gas contains harmful NOx, unburned component gas such as CO gas or hydrocarbon gas (HC), etc., the combustion exhaust gas is appropriately prevented from being discharged to the outside.

在本發明之工業爐中，為了解決如前述之課題，在將燃料氣體及燃燒用空氣供給至燃燒器，藉由前 述之燃燒器使燃料氣體在爐內燃燒，使燃燒後之燃燒廢氣從爐內經由排氣管而排出之工業爐中，係於前述之排氣管設置收容有三元觸媒之廢氣處理部。 In the industrial furnace of the present invention, in order to solve the aforementioned problems, the fuel gas and combustion air are supplied to the burner The above-mentioned burner burns fuel gas in the furnace and exhausts the burnt combustion exhaust gas from the furnace through the exhaust pipe. The exhaust pipe provided with the ternary catalyst is disposed in the exhaust pipe.

繼而，前述工業爐中係藉由收容於前述廢氣處理部之三元觸媒，利用燃燒廢氣所含之未燃成分氣體使燃燒廢氣所含之NOx還原。此時，在對燃燒器供給燃料氣體與燃燒用空氣時，若減少相對於燃料氣體之燃燒用空氣之量而使燃燒用空氣之空氣比μ設為1.0以下，則燃燒時產生之NOx之量會變少而於燃燒廢氣所含之NOx減少，並且會因前述之三元觸媒而使燃燒廢氣所含之NOx被燃燒廢氣所含之未燃成分氣體充分還原。 Then, in the industrial furnace, the NOx contained in the combustion exhaust gas is reduced by the unburned component gas contained in the combustion exhaust gas by the ternary catalyst contained in the exhaust gas treatment part. At this time, when fuel gas and combustion air are supplied to the burner, if the amount of 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 It will decrease and the NOx contained in the combustion exhaust gas will decrease, and the NOx contained in the combustion exhaust gas will be fully reduced by the unburned component gas contained in the combustion exhaust gas due to the aforementioned three-way catalyst.

又，本發明之工業爐中，較佳係設置有：燃料氣體導引路徑，其係將供給至前述燃燒器之燃料氣體之一部分，導引至在燃燒廢氣之排出方向之比設置於前述排氣管之廢氣處理部更上游側之位置；以及，控制手段，其係控制經由該燃料氣體導引路徑而導引之燃料氣體之量。 In addition, in the industrial furnace of the present invention, it is preferable to provide a fuel gas guide path that guides a portion of the fuel gas supplied to the burner to a ratio in the discharge direction of the combustion exhaust gas to the exhaust gas. The position of the exhaust gas treatment section of the gas pipe further upstream; and, a control means that controls the amount of fuel gas guided through the fuel gas guide path.

在此，前述之控制手段中，係對應於前述燃燒廢氣所含之氮氧化物之量，以控制經由燃料氣體導引路徑而導引之燃料氣體之量。 Here, the aforementioned control means corresponds to the amount of nitrogen oxides contained in the combustion exhaust gas to control the amount of fuel gas guided through the fuel gas guide path.

繼而，如前述般對燃燒器供給燃料氣體與燃燒用空氣時，為了提高燃燒效率，而在相對於燃料氣體之燃燒用空氣之量變多之狀態下，藉前述燃燒器使燃料氣體燃燒，結果在燃燒廢氣中含有大量NOx時，會在前述之 燃燒廢氣經由排氣管而被導引至收容有三元觸媒之廢氣處理部之前，藉由前述之控制手段，經由燃料氣體導引路徑而供給適當量之燃料氣體。如此一來，含有大量NOx之燃燒廢氣與適當量之燃料氣體便一起被導引至廢氣處理部，藉由前述之三元觸媒之作用，而使燃燒廢氣中之NOx被充分還原而排出。 Then, when the fuel gas and the combustion air are supplied to the burner as described above, in order to improve the combustion efficiency, the fuel gas is burned by the burner in a state where the amount of the combustion air relative to the fuel gas is increased. When the combustion exhaust contains a lot of NOx, it will be The combustion exhaust gas is guided to the exhaust gas treatment section containing the ternary catalyst through the exhaust pipe, and the fuel gas is supplied in an appropriate amount through the fuel gas guide path by the aforementioned control means. In this way, the combustion exhaust gas containing a large amount of NOx is led to the exhaust gas treatment part together with an appropriate amount of fuel gas, and the NOx in the combustion exhaust gas is sufficiently reduced and discharged by the action of the aforementioned three-way catalyst.

又，在本發明之前述工業爐中，較佳係在燃燒廢氣之排出方向之比設於排氣管之廢氣處理部更下游側之位置，設置有使自廢氣處理部排出之燃燒廢氣所含之未燃成分氣體燃燒之後燃燒裝置。如此一來，廢氣處理部中經處理之燃燒廢氣中即使殘留未燃成分氣體，該未燃成分氣體亦會被前述後燃燒裝置燃燒而氧化成CO2、H2O，可防止未燃成分氣體被排出。 Furthermore, in the aforementioned industrial furnace of the present invention, it is preferable that the combustion exhaust gas discharged from the exhaust gas treatment section be provided at a position downstream of the exhaust gas treatment section of the exhaust pipe in the discharge direction of the combustion exhaust gas. Combustion device after the unburned component gas is burned. In this way, even if unburned component gas remains in the treated combustion exhaust gas in the exhaust gas treatment unit, the unburned component gas will be burned by the aforementioned post-combustion device and oxidized into CO 2 and H 2 O, which can prevent the unburned component gas Be discharged.

又，本發明之工業爐中，較佳係設置藉由前述燃燒廢氣之熱而使燃燒用空氣加熱之熱交換手段，使被該熱交換手段加熱之燃燒用空氣供給至前述燃燒器。如此一來，可有效地利用燃燒廢氣之熱進行有效率之燃燒。 In addition, in the industrial furnace of the present invention, it is preferable to provide heat exchange means for heating the combustion air by the heat of the combustion exhaust gas, and to supply the combustion air heated by the heat exchange means to the burner. In this way, the heat of the combustion exhaust gas can be effectively used for efficient combustion.

本發明中之工業爐中係將燃料氣體及燃燒用空氣供給至燃燒器，使燃料氣體在爐內燃燒，而使燃燒後之燃燒廢氣從爐內經由排氣管而排出時，如前述般，係於排氣管設置收容有三元觸媒之廢氣處理部，將前述之燃燒廢氣導引至前述之廢氣處理部，以適當處理燃燒廢氣中由有害的NOx、及CO氣體、碳氫化合物(HC)氣體所構成 之未燃成分氣體。 In the industrial furnace of the present invention, fuel gas and combustion air are supplied to the burner to burn the fuel gas in the furnace, and the combustion exhaust gas after combustion is discharged from the furnace through the exhaust pipe as described above. The exhaust pipe is provided with an exhaust gas treatment part containing a ternary catalyst, and the aforementioned combustion exhaust gas is led to the aforementioned exhaust gas treatment part to appropriately process the harmful NOx, CO gas, and hydrocarbons (HC) in the combustion exhaust gas ) Gas composition The unburned component gas.

此結果，在本發明中之工業爐中係使燃料氣體與燃燒用空氣混合而在爐內燃燒時，燃燒廢氣中之NOx、未燃成分氣體會在設置於排氣管之廢氣處理部中被適當處理，以燃燒廢氣中不含NOx、未燃成分氣體之安全狀態，使燃燒廢氣經由排氣管而適當排出至外部。 As a result, in the industrial furnace of the present invention, when fuel gas is mixed with combustion air and burned in the furnace, the NOx and unburned component gas in the combustion exhaust gas are treated in the exhaust gas treatment section provided in the exhaust pipe. Appropriate treatment, in a safe state that the combustion exhaust gas does not contain NOx and unburned component gas, so that the combustion exhaust gas is appropriately discharged to the outside through the exhaust pipe.

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‧‧‧Combustion air supply pipe

23‧‧‧廢氣處理部 23‧‧‧ Waste gas treatment department

24‧‧‧後燃燒裝置 24‧‧‧After burning device

24a‧‧‧後燃燒用燃料氣體供給管 24a‧‧‧Post-combustion fuel gas supply pipe

24b‧‧‧後燃燒用空氣供給管 24b‧‧‧Post-combustion air supply pipe

25a‧‧‧熱交換部(熱交換手段) 25a‧‧‧Heat Exchange Department (Heat Exchange Means)

25b‧‧‧燃燒用空氣導引管 25b‧‧‧Combustion air guide tube

25c‧‧‧加熱燃燒用空氣供給管 25c‧‧‧Heating air supply tube for combustion

26‧‧‧燃料氣體導引路徑 26‧‧‧ Fuel gas guide path

26a‧‧‧控制閥(控制手段) 26a‧‧‧Control valve (control means)

μ‧‧‧空氣比 μ‧‧‧Air ratio

第1圖表示使用本發明第1實施形態之工業爐的狀態之概略說明圖。 Fig. 1 is a schematic explanatory diagram showing the state of using the industrial furnace according to the first embodiment of the present invention.

第2圖表示使用本發明第2實施形態之工業爐的狀態之概略說明圖。 Fig. 2 is a schematic explanatory diagram showing the state of using the industrial furnace according to the second embodiment of the present invention.

第3圖表示使用本發明第3實施形態之工業爐的狀態之概略說明圖。 Fig. 3 is a schematic explanatory diagram showing a state in which an industrial furnace according to a third embodiment of the present invention is used.

第4圖表示使用本發明第4實施形態之工業爐的狀態之概略說明圖。 Fig. 4 is a schematic explanatory diagram showing a state where an industrial furnace according to a fourth embodiment of the present invention is used.

第5圖表示使用本發明第5實施形態之工業爐的狀態之概略說明圖。 Fig. 5 is a schematic explanatory diagram showing a state in which an industrial furnace according to a fifth embodiment of the present invention is used.

以下，依據添附圖式而具體說明本發明之實施形態的工業爐。又，本發明之工業爐係不受下述之實施形態所示者限定，在不變更發明之要旨的範圍內，可作適當變更而實施。 Hereinafter, an industrial furnace according to an embodiment of the present invention will be specifically described based on the attached drawings. In addition, the industrial furnace of the present invention is not limited to those shown in the following embodiments, and can be implemented with appropriate changes within the scope of not changing the gist of the invention.

在此，在第1之實施形態的工業爐中，如第 1圖所示，係在爐10之爐壁11設置燃燒器12，對該燃燒器12經由燃料氣體供給管21供給碳氫化合物(HC)氣體等之燃料氣體，同時經由燃燒用空氣供給管22供給燃燒用空氣，在該燃燒器12中混合燃料氣體與燃燒用空氣，以使燃料氣體在爐10內燃燒。 Here, in the industrial furnace of the first embodiment, as As 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 burner 12 via a fuel gas supply pipe 21, and at the same time via a combustion air supply pipe 22 The combustion air is supplied, and the fuel gas and the combustion air are mixed in the burner 12 to burn the fuel gas in the furnace 10.

又，如此地設置將使燃料氣體在爐10內燃燒後之燃燒廢氣從爐10內排出之排氣管13，在該排氣管13設置收容有三元觸媒之廢氣處理部23，將在爐10內燃燒後之燃燒廢氣經由前述排氣管13導引至該廢氣處理部23，俾藉由收容在廢氣處理部23之三元觸媒來處理燃燒廢氣。 In addition, the exhaust pipe 13 that exhausts the combustion exhaust gas after the fuel gas is burned in the furnace 10 from the furnace 10 is provided in this way, and the exhaust pipe 13 is provided with an exhaust gas treatment unit 23 containing a ternary catalyst, which will be placed in the furnace The combustion exhaust gas after combustion in 10 is guided to the exhaust gas treatment part 23 through the exhaust pipe 13 so as to process the combustion exhaust gas by the ternary catalyst contained in the exhaust gas treatment part 23.

在此，在該實施形態之工業爐中，經由前述燃料氣體供給管21與燃燒用空氣供給管22而對燃燒器12供給燃料氣體與燃燒用空氣時，為了減少燃燒時產生之NOx之量，係減少相對於燃料氣體之燃燒用空氣之量，例如，使燃燒用空氣之空氣比μ設為1.0以下，在前述之燃燒器12中使燃料氣體燃燒。 Here, in the industrial furnace of this embodiment, when the fuel gas and the 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 amount of combustion air relative to 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 burned in the burner 12 described above.

若如此地減少相對於燃料氣體之燃燒用空氣之量而進行燃燒，燃燒廢氣所含之NOx會減少，同時在該燃燒廢氣中會殘留CO氣體、碳氫化合物(HC)氣體等之未燃成分氣體。 If the amount of combustion air relative to the fuel gas is reduced in this way, the NOx contained in the combustion exhaust gas will be reduced, and unburned components such as CO gas and hydrocarbon (HC) gas will remain in the combustion exhaust gas gas.

繼而，如此地將殘留有NOx與未燃成分氣體之燃燒廢氣從爐10內經由前述之排氣管13導引至廢氣處理部23，藉由收容於該廢氣處理部23之三元觸媒，使 殘留於燃燒廢氣之NOx與未燃成分氣體進行反應，而使NOx還原成N2，同時以未燃成分氣體被氧化成CO2、H2O之狀態排出。 Then, in this way, the combustion exhaust gas in which NOx and unburnt component gases remain is guided from the furnace 10 through the exhaust pipe 13 to the exhaust gas treatment unit 23, and by the ternary catalyst contained in the exhaust gas treatment unit 23, the residue NOx and unburned component in the combustion exhaust gas of the reaction, the NOx to N 2, while the unburned gas component is oxidized to CO 2, H 2 O of the state of discharge.

在此，如此地藉由收容於廢氣處理部23之三元觸媒將殘留有NOx與未燃成分氣體之燃燒廢氣進行處理時，相對於燃料氣體之燃燒用空氣之量會變得更少，燃燒廢氣中之未燃成分氣體變多，其未經收容於廢氣處理部23之三元觸媒充分處理，恐有從廢氣處理部23排出殘留有未燃成分氣體之燃燒廢氣之虞。 Here, when the combustion exhaust gas in which NOx and unburned component gas remain is treated by the ternary catalyst contained in the exhaust gas treatment unit 23, the amount of combustion air relative to the fuel gas becomes smaller, Unburned component gas in the combustion exhaust gas increases, and it has not been fully processed by the ternary catalyst contained in the exhaust gas treatment part 23, and there is a possibility that the exhaust gas from the exhaust gas treatment part 23 may discharge the combustion waste gas in which the unburned component gas remains.

因此，在第2之實施形態之工業爐中，如第2圖所示，係在前述第1實施形態之工業爐中，在燃燒廢氣之排出方向之比設置於排氣管13之前述廢氣處理部23更下游側之位置設置後燃燒裝置24，對於該後燃燒裝置24，依需要可從後燃燒用燃料氣體供給管24a供給後燃燒用燃料氣體，以及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 second embodiment, as shown in FIG. 2, in the industrial furnace of the first embodiment, the exhaust gas treatment provided in the exhaust pipe 13 in the ratio of the exhaust gas discharge direction The post-combustion device 24 is provided further downstream of the portion 23, and the post-combustion device 24 can be supplied with post-combustion fuel gas from the post-combustion fuel gas supply pipe 24a and after being supplied from the post-combustion air supply pipe 24b Air for combustion.

繼而，在該第2實施形態中之工業爐中，係使從廢氣處理部23所排出之殘留於燃燒廢氣之未燃成分氣體在前述之後燃燒裝置24中燃燒，以使未燃成分氣體氧化成CO2氣體、H2O而排出。 Then, in the industrial furnace in the second embodiment, the unburned component gas remaining in the combustion exhaust gas discharged from the exhaust gas treatment unit 23 is burned in the aforementioned subsequent combustion device 24 to oxidize the unburned component gas into CO 2 gas and H 2 O are discharged.

因此，即使在前述之廢氣處理部23中未充分處理未燃成分氣體而使殘留有未燃成分氣體之燃燒廢氣從廢氣處理部23排出，該未燃成分氣體亦會在後燃燒裝置24中被燃燒而處理，可確實地防止未燃成分氣體被排出。 又，在該實施形態中，係使用藉由火焰而使殘留於燃燒廢氣之未燃成分氣體燃燒之後燃燒裝置24，但後燃燒裝置24係不限定於此種類，亦可藉由電氣加熱等而使殘留於燃燒廢氣之未燃成分氣體燃燒。 Therefore, even if the unburned component gas is not sufficiently treated in the aforementioned exhaust gas processing unit 23 and the combustion exhaust gas remaining the unburned component gas is discharged from the exhaust gas processing unit 23, the unburned component gas will be treated in the post-combustion device 24 Combustion and treatment can reliably prevent unburned component gas from being discharged. Furthermore, in this embodiment, a post-combustion device 24 that burns the unburned component gas remaining in the combustion exhaust gas by a flame is used, but the post-combustion device 24 is not limited to this type, and may be electrically heated or the like. The unburned component gas remaining in the combustion exhaust gas is burned.

其次，在第3實施形態之工業爐中，如第3圖所示，係在前述第1實施形態之工業爐中，以取代對燃燒器12供給燃燒用空氣之燃燒用空氣供給管22，而在將來自爐10內之燃燒廢氣導引至廢氣處理部23之前述之排氣管13內，設置藉由燃燒用廢氣之熱加熱燃燒用空氣之熱交換部(熱交換手段)25a，並設置將燃燒用空氣導引至該熱交換部25a之燃燒用空氣導引管25b，同時設置將在前述之熱交換部25a中被加熱之燃燒用空氣供給至燃燒器12之加熱燃燒用空氣供給管25c。 Next, in the industrial furnace of the third embodiment, as shown in FIG. 3, in the industrial furnace of the first embodiment described above, instead of the combustion air supply pipe 22 for supplying combustion air to the burner 12, and A heat exchange section (heat exchange means) 25a that heats the combustion air by the heat of the combustion exhaust gas is provided in the aforementioned exhaust pipe 13 that guides the combustion exhaust gas from the furnace 10 to the exhaust gas treatment section 23, and is provided A combustion air guide pipe 25b that guides combustion air to the heat exchange section 25a, and a heating combustion air supply pipe that supplies the combustion air heated in the aforementioned heat exchange section 25a to the burner 12 25c.

繼而，在該第3實施形態之工業爐中，如前述般經由燃燒用空氣導引管25b將燃燒用空氣導引至熱交換部25a，在該熱交換部25a中藉由燃燒用廢氣之熱加熱燃燒用空氣，如此地，將被加熱之燃燒用空氣經由前述加熱燃燒用空氣供給管25c供給至燃燒器12，使如此地被加熱之燃燒用空氣與燃料氣體在燃燒器12中混合，以使燃料氣體在爐10內燃燒。 Then, in the industrial furnace of the third embodiment, the combustion air is guided to the heat exchange section 25a through the combustion air guide pipe 25b as described above, and the heat of the combustion exhaust gas is used in the heat exchange section 25a The combustion air is heated, so that the heated combustion air is supplied to the burner 12 through the heating and combustion air supply pipe 25c, so that the thus heated combustion air and fuel gas are mixed in the burner 12 to The fuel gas is burned in the furnace 10.

如此一來，使燃料氣體與燃燒用空氣混合而燃燒時，可有效地利用燃燒用廢氣之熱。又，如此地在熱交換部25a中於燃燒用廢氣與燃燒用空氣之間進行熱交換，藉此，從爐10內經由排氣管13而導入至前述廢氣處 理部23之燃燒用廢氣之溫度會降低，可防止燃燒用廢氣之溫度形成超過要使用收容於廢氣處理部23的三元觸媒之溫度領域的溫度，可藉由三元觸媒適當處理燃燒用廢氣。又，在此實施形態中，雖然將熱交換部25a設置於排氣管13內，但亦可將熱交換部25a設置於排氣管13之外部。 In this way, when the fuel gas is mixed with the combustion air and burned, the heat of the combustion exhaust gas can be effectively used. In addition, heat exchange is performed between the combustion exhaust gas and the combustion air in the heat exchange unit 25a in this way, whereby the furnace 10 is introduced into the exhaust gas from the furnace 10 through the exhaust pipe 13 The temperature of the combustion exhaust gas of the processing unit 23 is reduced, which prevents the temperature of the combustion exhaust gas from exceeding the temperature range of the temperature range of the ternary catalyst contained in the exhaust gas processing unit 23, and the ternary catalyst can appropriately treat the combustion Use exhaust gas. In addition, in this embodiment, although the heat exchange part 25a is provided in the exhaust pipe 13, the heat exchange part 25a may be provided outside the exhaust pipe 13.

其次，在第4實施形態之工業爐中，如第4圖所示，在前述第1實施形態之工業爐中係設置：燃料氣體導引路徑26，其係將經由燃料氣體供給管21供給至燃燒器12之燃料氣體之一部分，導引至在燃燒廢氣之排出方向之比設置於前述排氣管13之廢氣處理部23更上游側之位置；以及，控制閥(控制手段)26a，其係控制經由該燃料氣體導引路徑26而供給至位於燃燒廢氣之排出方向之比廢氣處理部23更上游側之位置的排氣管13的燃料氣體之量。 Next, in the industrial furnace of the fourth embodiment, as shown in FIG. 4, the industrial furnace of the first embodiment described above is provided with a fuel gas guide path 26 which is supplied to the fuel gas supply pipe 21 to A part of the fuel gas of the burner 12 is led to a position upstream of the exhaust gas treatment part 23 provided in the exhaust pipe 13 in the discharge direction of the combustion exhaust gas; and a control valve (control means) 26a, which is The amount of fuel gas supplied to the exhaust pipe 13 located upstream of the exhaust gas treatment unit 23 through the fuel gas guide path 26 in the discharge direction of the combustion exhaust gas is controlled.

繼而，在第4之實施形態係工業爐中，係對應在前述之燃燒器12中燃燒後之燃燒廢氣所含之NOx之量，藉由前述之控制閥26a而控制經由燃料氣體導引路徑26而供給至位於燃燒廢氣之排出方向之比通廢氣處理部23更上流側之位置的排氣管13的燃料氣體之量。 Then, in the fourth embodiment, the industrial furnace corresponds to the amount of NOx contained in the combustion exhaust gas after being burned in the burner 12 described above, and is controlled by the fuel gas guide path 26 by the aforementioned control valve 26a. On the other hand, the amount of fuel gas supplied to the exhaust pipe 13 located upstream of the exhaust gas treatment unit 23 in the discharge direction of the combustion exhaust gas.

在此，經由前述燃料氣體供給管21與燃燒用空氣供給管22將供給至燃燒器12之燃料氣體及燃燒用空氣進行供給時，為了提高燃燒效率，以燃燒用空氣之空氣比μ超過1.0之方式，增加相對於燃料氣體之燃燒用空氣之量，使燃料氣體在前述燃燒器12中燃燒時，藉由充分 量之燃燒用空氣使燃料氣體燃燒，會減少燃燒廢氣中之CO氣體、碳氫化合物(HC)氣體等之未燃成分氣體，另一方面，燃燒時產生許多NOx，而在燃燒廢氣中含有大量之NOx。 Here, when the fuel gas and the combustion air supplied to the burner 12 are supplied through the fuel gas supply pipe 21 and the combustion air supply pipe 22, in order to improve the combustion efficiency, the air ratio μ of the combustion air exceeds 1.0 Way, increase the amount of combustion air relative to the fuel gas, so that when the fuel gas is burned in the burner 12, the The amount of combustion air used to burn the fuel gas will reduce the unburned component gases such as CO gas and hydrocarbon (HC) gas in the combustion exhaust gas. On the other hand, a lot of NOx is generated during combustion, and the combustion exhaust gas contains a lot of NOx.

繼而，如此地，在燃燒廢氣中含有大量之NOx時，藉由前述之控制閥26a，控制經由前述燃料氣體導引路徑26而導引至位於燃燒廢氣之排出方向之比廢氣處理部23更上游側之位置的排氣管13之燃料氣體之量，將適當量之燃料氣體供給至在燃燒廢氣之排出方向之比廢氣處理部23更上游側之位置，與前述之含有大量之NOx的燃燒廢氣一起導引至收容有三元觸媒之廢氣處理部23。如此一來，藉由收容於廢氣處理部23之三元觸媒之作用，燃燒廢氣中之NOx會與燃料氣體反應，將NOx還原成N2，同時將燃料氣體氧化成CO2、H2O之狀態而排出。 Then, when a large amount of NOx is contained in the combustion exhaust gas as described above, the control valve 26a is used to control the fuel gas guide path 26 to be directed upstream of the exhaust gas treatment unit 23 in the discharge direction of the combustion exhaust gas. The amount of fuel gas in the exhaust pipe 13 at the side is to supply an appropriate amount of fuel gas to a position upstream of the exhaust gas treatment unit 23 in the exhaust direction of the combustion exhaust gas, and the aforementioned combustion exhaust gas containing a large amount of NOx They are led to the exhaust gas treatment part 23 containing the ternary catalyst together. Thus, by the action of the three-way catalytic 23 accommodated in the exhaust gas treating unit, the combustion of NOx in the exhaust gas reacts with the fuel, to reduce NOx into N 2, while the fuel gas is oxidized to CO 2, H 2 O To be discharged.

其次，在第5實施形態之工業爐中，如第5圖所示，係在前述第4實施形態之工業爐中，如前述第2實施形態之工業爐所示，在位於燃燒廢氣之排出方向之比前述廢氣處理部23更下游側之位置之排氣管13設置後燃燒裝置24，同時如前述第3實施形態之工業爐所示，在將來自爐10內之燃燒廢氣導引至廢氣處理部23之排氣管13內，設置：藉由燃燒用廢氣之熱加熱燃燒用空氣之熱交換部25a，將加熱之燃燒用空氣導引至該熱交換部25a之燃燒用空氣導引管25b，以及，將在前述之熱交換部25a中被加熱之燃燒用空氣供給至燃燒器12之加熱燃燒用空氣供給管25c。 Next, in the industrial furnace of the fifth embodiment, as shown in FIG. 5, in the industrial furnace of the foregoing fourth embodiment, as shown in the industrial furnace of the foregoing second embodiment, in the discharge direction of the combustion exhaust gas The exhaust pipe 13 located downstream of the exhaust gas treatment unit 23 is provided with a post-combustion device 24, and at the same time, as shown in the industrial furnace of the third embodiment, the combustion exhaust gas from the furnace 10 is led to the exhaust gas treatment. In the exhaust pipe 13 of the part 23, a heat exchange part 25a for heating combustion air by the heat of combustion exhaust gas is provided, and a combustion air guide pipe 25b for guiding the heated combustion air to the heat exchange part 25a And, the combustion air heated in the aforementioned heat exchange portion 25a is supplied to the heating combustion air supply pipe 25c of the burner 12.

繼而，在該第5實施形態之工業爐中，係與前述第3實施形態之工業爐同樣，經由燃燒用空氣導引管25b將燃燒用空氣導引至熱交換部25a，在該熱交換部25a中藉由燃燒用廢氣之熱加熱燃燒用空氣，如此地，將被加熱之燃燒用空氣經由前述加熱燃燒用空氣供給管25c供給至燃燒器12，使被加熱之燃燒用空氣與燃料氣體在燃燒器12中混合，以使燃料氣體在爐10內燃燒。 Next, in the industrial furnace of the fifth embodiment, similar to the industrial furnace of the third embodiment described above, the combustion air is guided to the heat exchange section 25a via the combustion air guide pipe 25b, and the heat exchange section In 25a, the combustion air is heated by the heat of the combustion exhaust gas. In this way, the heated combustion air is supplied to the burner 12 through the heating and combustion air supply pipe 25c, so that the heated combustion air and fuel gas The burner 12 mixes so that the fuel gas is burned in the furnace 10.

如此一來，如前所述，在使燃燒用空氣與燃料氣體混合而使燃料氣體燃燒時，可有效地利用燃燒用廢氣之熱，且從爐10導引至廢氣處理部23之燃燒用廢氣之溫度會降低，防止燃燒用廢氣之溫度形成超過使用收容於廢氣處理部23之三元觸媒的溫度領域之溫度，俾可藉由三元觸媒適當處理燃燒用廢氣。 In this way, as described above, when the combustion air is mixed with the fuel gas to burn the fuel gas, the heat of the combustion exhaust gas can be effectively used, and the combustion exhaust gas guided from the furnace 10 to the exhaust gas treatment unit 23 The temperature will be reduced to prevent the temperature of the combustion exhaust gas from exceeding the temperature range using the ternary catalyst contained in the exhaust gas treatment unit 23, so that the combustion exhaust gas can be appropriately treated by the ternary catalyst.

又，在該第5實施形態之工業爐中，經由前述燃料氣體導引路徑26而導引之燃料氣體之量會變多，若比使燃燒廢氣中之NOx還原成N2時所需要之量更多之燃料氣體被導引至廢氣處理部23，則會從廢氣處理部23排出殘留有未燃成分氣體之燃燒廢氣。如此之情形，與前述第2實施形態之工業爐同樣，可使從廢氣處理部23所排出之殘留於燃燒廢氣的未燃成分氣體在後燃燒裝置24中燃燒，以使未燃成分氣體氧化成CO2氣體、H2O而排出。 In addition, in the industrial furnace of the fifth embodiment, the amount of fuel gas guided through the fuel gas guide path 26 will increase, if it is less than the amount required when reducing NOx in the combustion exhaust gas to N 2 When more fuel gas is led to the exhaust gas treatment part 23, the combustion exhaust gas in which the unburned component gas remains is discharged from the exhaust gas treatment part 23. In this case, as in the industrial furnace of the second embodiment described above, the unburned component gas remaining in the combustion exhaust gas discharged from the exhaust gas treatment unit 23 can be burned in the post-combustion device 24 to oxidize the unburned component gas into CO 2 gas and H 2 O are discharged.

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‧‧‧Combustion air supply pipe

23‧‧‧廢氣處理部 23‧‧‧ Waste gas treatment department

Claims (5)

一種工業爐，係將燃料氣體及燃燒用空氣供給至燃燒器，藉由前述之燃燒器使燃料氣體在爐內燃燒，使燃燒後之燃燒廢氣從爐內經由排氣管而排出者，其中，在前述之排氣管設置有收容三元觸媒之廢氣處理部，並且在比設於前述排氣管之廢氣處理部更位於燃燒廢氣的排出方向之下游側的位置，設置有使從廢氣處理部排出之燃燒廢氣所含之未燃成分氣體燃燒之後燃燒裝置。 An industrial furnace supplies fuel gas and combustion air to a burner, and the fuel gas is burned in the furnace by the aforementioned burner, and the combustion exhaust gas after combustion is discharged from the furnace through an exhaust pipe, wherein, The aforementioned exhaust pipe is provided with an exhaust gas treatment part accommodating a ternary catalyst, and a downstream side of the exhaust gas treatment part provided in the exhaust pipe in the discharge direction of combustion exhaust gas is provided Combustion device after the unburned component gas contained in the combustion exhaust gas discharged from the unit is burned. 如申請專利範圍第1項所述之工業爐，其中，藉由收容於前述廢氣處理部之三元觸媒，利用燃燒廢氣所含之未燃成分氣體使燃燒廢氣所含之氮氧化物還原。 The industrial furnace as described in item 1 of the patent application scope, wherein the ternary catalyst contained in the exhaust gas treatment unit reduces the nitrogen oxides contained in the combustion exhaust gas by using the unburned component gas contained in the combustion exhaust gas. 如申請專利範圍第1項所述之工業爐，其係設置有：燃料氣體導引路徑，其係將供給至前述燃燒器之燃料氣體之一部分，導引至在燃燒廢氣之排出方向之比設置於前述排氣管之廢氣處理部更上游側之位置；以及，控制手段，其係控制經由該燃料氣體導引路徑而導引之燃料氣體之量。 The industrial furnace as described in item 1 of the patent application scope is provided with a fuel gas guide path which guides a part of the fuel gas supplied to the aforementioned burner to a ratio set in the discharge direction of the combustion exhaust gas A position further upstream of the exhaust gas treatment portion of the aforementioned exhaust pipe; and, a control means that controls the amount of fuel gas guided through the fuel gas guide path. 如申請專利範圍第3項所述之工業爐，其係對應前述之燃燒廢氣所含之氮氧化物之量，藉由前述控制手段而控制經由燃料氣體導引路徑而導引至排氣管之燃料氣體之量。 The industrial furnace as described in item 3 of the patent application scope corresponds to the amount of nitrogen oxides contained in the aforementioned combustion exhaust gas, and is controlled by the aforementioned control means to be guided to the exhaust pipe through the fuel gas guide path The amount of fuel gas. 如申請專利範圍第1至4項中任一項所述之工業爐，其係設置有藉由前述燃燒廢氣之熱使燃燒用空氣加熱 之熱交換手段，且將藉由該熱交換手段被加熱之燃燒用空氣供給至前述燃燒器。 The industrial furnace as described in any one of the items 1 to 4 of the patent application scope, which is provided with heating the combustion air by the heat of the combustion exhaust gas Heat exchange means, and the combustion air heated by the heat exchange means is supplied to the burner.
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