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TWI749215B - Heat treatment furnace - Google Patents

Heat treatment furnace Download PDF

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Publication number
TWI749215B
TWI749215B TW107113341A TW107113341A TWI749215B TW I749215 B TWI749215 B TW I749215B TW 107113341 A TW107113341 A TW 107113341A TW 107113341 A TW107113341 A TW 107113341A TW I749215 B TWI749215 B TW I749215B
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Taiwan
Prior art keywords
furnace
combustion
waist
heat storage
regenerative burner
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TW107113341A
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Chinese (zh)
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TW201907123A (en
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河本祐作
川端健介
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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
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • 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
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/10—Arrangements for using waste heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/10—Arrangements for using waste heat
    • F27D17/12—Arrangements for using waste heat using heat storage
    • F27D17/13—Arrangements for using waste heat using heat storage using regenerative heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D2099/0053—Burner fed with preheated gases
    • 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)
  • Gas Burners (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

According to the present invention, when a combustion operation and a heat storage operation are alternately switched and performed for a ceiling side heat storage combustion burner 20 provided on a ceiling portion 11 and a waist side heat storage combustion burner 30 provided on a waist portion 12, the heated combustion air is made to swirl around an inner circumference of a tubular ceiling side guiding path 23 while it is supplied from a ceiling side air inlet/outlet 24 to the inside of a furnace 10 to make fuel burn and swirl during the combustion operation of the ceiling side heat storage combustion burner, and on the other hand, the heated combustion air is supplied along an inner circumference of the waist portion in the furnace from a waist side air inlet/outlet 31 via a waist side guiding path 32 to make the fuel swirl along the inner circumference of the waist portion and burn during the combustion operation of the waist side heat storage combustion burner.

Description

熱處理爐 Heat treatment furnace

本發明係關於採用一方面進行燃燒動作且另一方面進行蓄熱動作的蓄熱式燃燒器而交互地切換進行燃燒動作與蓄熱動作之熱處理爐，該燃燒動作係利用蓄熱部中收容的蓄熱材所蓄積的熱使燃燒用空氣加熱，然後使加熱過之燃燒用空氣經由導引路徑而從給排氣口導引到爐內，使從燃料供給噴嘴供給的燃料與前述加熱過的燃燒用空氣在爐內燃燒，該蓄熱動作係將在爐內之燃燒後的燃燒排放氣體導引到收容有蓄熱材之蓄熱部，使燃燒排放氣體的熱蓄積到蓄熱材。尤其為一種關於在下述的點具有特徵者，亦即：在分別於爐的爐頂部及爐腰部設有蓄熱式燃燒器之熱處理爐中，在設於爐的爐頂部之爐頂部側蓄熱式燃燒器及設於爐的爐腰部之爐腰部側蓄熱式燃燒器交互地切換進行燃燒動作及蓄熱動作，使爐內加熱而對爐內的被處理物進行熱處理之際，可抑制來自爐頂部側蓄熱式燃燒器的火焰及來自爐腰部側蓄熱式燃燒器的火焰接觸到被處理物等而對被處理物造成損傷、或燃燒時的火焰的溫度變高導致NOx的產生量變多等情形，而且可效率良好地使爐內加熱，而充分地對被處理物進行熱處理之點。 The present invention relates to a heat treatment furnace that uses a regenerative burner that performs a combustion operation on the one hand and a heat storage operation on the other to alternately switch between the combustion operation and the heat storage operation. The combustion operation uses the heat storage material stored in the heat storage unit. The heat heats the combustion air, and then the heated combustion air is guided into the furnace from the supply and exhaust ports through the guide path, so that the fuel supplied from the fuel supply nozzle and the heated combustion air are in the furnace Internal combustion, the heat storage action is to guide the combustion exhaust gas after combustion in the furnace to the heat storage part containing the heat storage material, so that the heat of the combustion exhaust gas is stored in the heat storage material. In particular, it relates to a heat treatment furnace with regenerative burners provided at the top and waist of the furnace, respectively, and regenerative combustion is provided on the top side of the furnace at the top of the furnace. The furnace and the waist-side regenerative burner installed in the waist of the furnace alternately switch between the combustion operation and the heat-storing operation to heat the furnace to heat the processed objects in the furnace, thereby suppressing heat accumulation from the furnace top side The flame of the type burner and the flame from the regenerative burner on the waist side of the furnace contact the object to be processed, etc., causing damage to the object to be processed, or the temperature of the flame during combustion increases, resulting in an increase in the amount of NOx generated, etc. The point where the furnace is heated efficiently and the object to be processed is sufficiently heat-treated.

過去，在加熱爐等熱處理爐係於在爐內將被處理物進行熱處理時，為了利用爐內的燃燒排放氣體的熱來進行效率良好的燃燒，而廣泛採用蓄熱式燃燒器，該蓄熱式燃燒器係將在爐內燃燒而產生的燃燒排放氣體的熱蓄積到蓄熱部內收容的蓄熱材中後，將燃燒用空氣導引到該蓄熱部，利用蓄熱部內的蓄熱材所蓄積的熱使該燃燒用空氣加熱，然後使經如此加熱過的燃燒用空氣與從燃料供給噴嘴供給的燃料混合，而使燃料在爐內燃燒。 In the past, heat treatment furnaces such as heating furnaces were used to heat treat objects in the furnace. In order to use the heat of combustion exhaust gas in the furnace to perform efficient combustion, regenerative burners were widely used. This regenerative combustion The device system accumulates the heat of the combustion exhaust gas generated by combustion in the furnace in the heat storage material contained in the heat storage unit, and then guides the combustion air to the heat storage unit, and uses the heat stored in the heat storage material in the heat storage unit to burn the heat The air is heated, and the combustion air thus heated is mixed with the fuel supplied from the fuel supply nozzle to burn the fuel in the furnace.

然而，在如前述之蓄熱式燃燒器的情況，因為係使加熱過之燃燒用空氣與燃料混合而燃燒，所以會有燃燒時的火焰的溫度變高導致NOx的產生量變多等問題。另外，在以往的蓄熱式燃燒器之情況，一般都是火焰的擴張較小而火焰的長度變長，而有火焰會接觸到爐內的被處理物而對被處理物造成損傷等問題，另一方面，在為了使火焰不會接觸到被處理物而使爐加大的情況，則會有為了充分地使爐內加熱而使得設備成本及運轉成本等各種成本變高之問題。 However, in the case of the aforementioned regenerative combustor, because the heated combustion air is mixed with the fuel to burn, the flame temperature during combustion becomes higher and the amount of NOx generated increases. In addition, in the case of conventional regenerative burners, the flame expansion is generally small and the length of the flame becomes longer, and there are problems such as the flame contacting the processed object in the furnace and causing damage to the processed object. On the one hand, when the furnace is enlarged in order to prevent the flame from contacting the object to be processed, there is a problem that various costs such as equipment cost and operating cost are increased in order to sufficiently heat the furnace.

另外，在過去，為了使如前述之蓄熱式燃燒器中之燃燒時的火焰縮短，已有提出如專利文獻1所揭示之下述技術方案，亦即：在燃料供給噴嘴的前端部設置具有通氣性之多孔質物質，而在燃料供給噴嘴的前端部構成火焰孔部同時構成燃料噴出部，且使利用蓄熱部內的蓄熱材予以加熱過的燃燒用空氣，在如前述方式設置多孔質 物質而構成的火焰孔部中與從燃料噴出部噴出的燃料混合而燃燒，來使燃燒時的火焰的長度縮短。 In addition, in the past, in order to shorten the flame during combustion in the aforementioned regenerative combustor, the following technical proposal as disclosed in Patent Document 1 has been proposed, that is, a vent is provided at the tip of the fuel supply nozzle. The front end of the fuel supply nozzle constitutes a flame hole and a fuel ejection part, and the combustion air heated by the heat storage material in the heat storage part is formed by installing the porous material in the above-mentioned manner. The flame hole portion is mixed with the fuel ejected from the fuel ejection portion and burned to shorten the length of the flame during combustion.

然而，如專利文獻1所揭示，為了使從燃料噴出部噴出的燃料與加熱過的燃燒用空氣在設置多孔質物質而構成的火焰孔部混合而燃燒，會因為要使燃燒用空氣經由前述之設置多孔質物質而構成的火焰孔部予以送出而必須使用很大的送風機等，而有使得設備成本及運轉成本變高之問題。 However, as disclosed in Patent Document 1, in order to mix and burn the fuel sprayed from the fuel spray part and the heated combustion air in the flame hole formed by the porous material, it is necessary to cause the combustion air to pass through the aforementioned It is necessary to use a large blower or the like to send out the flame hole formed by installing the porous material, which causes the problem of high equipment cost and running cost.

又，在過去，也有提出如專利文獻2所揭示之下述技術方案，亦即：在熱處理爐的爐腰部，沿著其圓周方向設置複數個蓄熱式燃燒器，且在相鄰的蓄熱式燃燒器交互地切換進行燃燒動作及蓄熱動作。 In addition, in the past, the following technical proposal as disclosed in Patent Document 2 has also been proposed, that is, a plurality of regenerative burners are provided along the circumferential direction of the waist portion of the heat treatment furnace, and the adjacent regenerative burners are combusted. The device alternately switches between the combustion operation and the heat storage operation.

然而，如此在熱處理爐的爐腰部利用沿著圓周方向設置的各個蓄熱式燃燒器進行燃燒之情況，會難以充分使爐內的中央部加熱，而且在沿著圓周方向設置之相鄰的蓄熱式燃燒器中交互地切換進行燃燒動作及蓄熱動作之情況，還會有：在燃燒動作時及蓄熱動作時從前述給排氣口噴出的燃料燃燒之方向、與經由前述給排氣口而抽吸爐內的燃燒排放氣體之方向係相反，而難以得到平順的迴旋流，並且使從正在進行燃燒之蓄熱式燃燒器的給排氣口噴出的火焰的熱立即經由用以進行蓄熱動作之設於旁邊的蓄熱式燃燒器的給排氣口而被抽吸，而難以充分地使爐內加熱之問題。 However, it is difficult to sufficiently heat the central part of the furnace when the waist of the heat treatment furnace is combusted with the regenerative burners arranged along the circumferential direction. Moreover, adjacent regenerative burners arranged along the circumferential direction are used for combustion. In the combustor, the combustion operation and the heat storage operation are alternately switched, and there may also be: the combustion direction of the fuel sprayed from the aforementioned inlet and outlet ports during the combustion operation and the heat storage action, and the suction through the aforementioned inlet and outlet ports. The direction of the combustion exhaust gas in the furnace is opposite, and it is difficult to obtain a smooth swirling flow, and the heat of the flame ejected from the exhaust port of the regenerative burner that is burning is immediately passed through the heat storage device. The exhaust port of the regenerative burner next to it is sucked and it is difficult to heat the furnace sufficiently.

還有，已有提出如專利文獻3所揭示之下 述技術方案，亦即：在用以將利用蓄熱部中的蓄熱材予以加熱過的燃燒用空氣供給至爐內的部分設置形成為圓筒形之圓筒部，且使前述加熱過的燃燒用空氣在該圓筒部內迴旋，同時從氣體噴嘴將燃料氣體供給到該圓筒部內，使如前述方式加熱而迴旋之燃燒用空氣與燃料氣體混合而燃燒，而且經由設於爐壁之擴徑部予以導引到爐內，以使燃燒的火焰的直徑逐漸擴大而使燃燒時的火焰的長度縮短，並且使NOx的產生量減低。 In addition, the following technical proposal as disclosed in Patent Document 3 has been proposed, that is, the part for supplying combustion air heated by the heat storage material in the heat storage part into the furnace is formed as a cylinder. The above-mentioned heated combustion air is swirled in the cylindrical part, and the fuel gas is supplied into the cylindrical part from the gas nozzle at the same time, and the combustion air and fuel gas that are heated and swirled in the above-mentioned manner It is mixed and combusted, and guided into the furnace through an enlarged diameter part provided on the furnace wall, so that the diameter of the burning flame is gradually enlarged, the length of the flame during combustion is shortened, and the amount of NOx generated is reduced.

然而，即使是如專利文獻3所揭示，在使加熱過的燃燒用空氣在用以將燃燒用空氣供給到爐內之圓筒部內迴旋，同時從氣體噴嘴將燃料氣體供給到該圓筒部內，且使如前述方式迴旋之加熱過的燃燒用空氣與燃料氣體混合而燃燒，而且經由設於爐壁之擴徑部使燃燒的火焰的直徑逐漸擴大之情況，為了使熱處理爐的爐內全體充分地加熱來處理被處理物，仍然必須增多燃料及燃燒用空氣的供給量。並且，如此地增多燃料及燃燒用空氣的供給量時，燃燒時的火焰的溫度就會變高，而無法充分地減低NOx的產生量，另外也難以使火焰的直徑沿著設於爐壁的擴徑部充分地擴大來使燃燒時的火焰的長度縮短，會發生火焰接觸到爐內的被處理物而對被處理物造成損傷等問題。 However, even as disclosed in Patent Document 3, when the heated combustion air is swirled in the cylindrical portion for supplying the combustion air into the furnace, the fuel gas is supplied into the cylindrical portion from the gas nozzle, In addition, the heated combustion air and the fuel gas are mixed and burned in the above-mentioned manner, and the diameter of the combustion flame is gradually enlarged through the enlarged diameter part provided on the furnace wall, in order to make the entire furnace of the heat treatment furnace sufficient To heat the ground to process the processed objects, it is still necessary to increase the supply of fuel and combustion air. In addition, when the supply of fuel and combustion air is increased in this way, the temperature of the flame during combustion will increase, and it will not be possible to sufficiently reduce the amount of NOx generated. In addition, it is difficult to make the diameter of the flame along the furnace wall. The enlarged diameter portion is sufficiently enlarged to shorten the length of the flame during combustion, and problems such as the flame contacting the object to be processed in the furnace and damaging the object to be processed may occur.

[先前技術文獻] [Prior Technical Literature] (專利文獻) (Patent Document)

(專利文獻1)日本特開2000-199611號公報 (Patent Document 1) JP 2000-199611 A

(專利文獻2)日本特開平7-71879號公報 (Patent Document 2) JP 7-71879 A

(專利文獻3)日本特開2013-2706號公報 (Patent Document 3) JP 2013-2706 A

本發明係以解決採用一方面進行燃燒動作且另一方面進行蓄熱動作的蓄熱式燃燒器而交互地切換進行燃燒動作與蓄熱動作之熱處理爐的如前述各種問題為其課題者，該燃燒動作係利用蓄熱部中收容的蓄熱材所蓄積的熱使燃燒用空氣加熱，並使加熱過之燃燒用空氣經由導引路徑而從給排氣口導引到爐內，使從燃料供給噴嘴供給的燃料與前述加熱過的燃燒用空氣在爐內燃燒，該蓄熱動作係將在爐內之燃燒後的燃燒排放氣體導引到收容有蓄熱材之蓄熱部，使燃燒排放氣體的熱蓄積到蓄熱材。 The present invention aims to solve the aforementioned various problems of a heat treatment furnace that uses a regenerative burner that performs combustion operation on the one hand and performs heat storage operation on the other hand to alternately switch between combustion operation and heat storage operation. The combustion operation system The combustion air is heated by the heat accumulated in the heat storage material contained in the heat storage unit, and the heated combustion air is guided into the furnace from the supply and exhaust port via the guide path, so that the fuel supplied from the fuel supply nozzle Combustion with the above-mentioned heated combustion air is combusted in the furnace, and the heat storage action is to guide the combustion exhaust gas after combustion in the furnace to the heat storage part containing the heat storage material, and accumulate the heat of the combustion exhaust gas in the heat storage material.

另外，還以下述內容為其課題：在本發明之熱處理爐中，分別於爐的爐頂部及爐腰部設置蓄熱式燃燒器，在設於爐的爐頂部之爐頂部側蓄熱式燃燒器及設於爐的爐腰部之爐腰部側蓄熱式燃燒器交互地切換進行燃燒動作及蓄熱動作，使爐內加熱而對爐內的被處理物進行熱處理之際，可抑制來自爐頂部側蓄熱式燃燒器的火焰及來自爐腰部側蓄熱式燃燒器的火焰接觸到被處理物等而對被處理物造成損傷、或燃燒時的火焰的溫度變高導致NOx的產生量變多等情形，而且可效率良好地使爐內加熱，而充分地對被處理物進行熱處理。 In addition, the following content is also the subject: In the heat treatment furnace of the present invention, a regenerative burner is provided on the top and waist of the furnace, respectively, and a regenerative burner is provided on the top side of the furnace on the top of the furnace. The regenerative burner on the side of the waist of the furnace alternately switches between the combustion operation and the regenerative operation to heat the furnace to heat the object to be processed in the furnace, and it can suppress the regenerative burner on the top side of the furnace The flame and the flame from the regenerative burner on the waist side of the furnace come into contact with the object to be processed and cause damage to the object to be processed, or the temperature of the flame during combustion increases, resulting in an increase in the amount of NOx generated, etc., and it can be efficiently The inside of the furnace is heated to sufficiently heat-treat the to-be-processed object.

在本發明之熱處理爐中，為了解決如前述課題，係設為採用一方面進行燃燒動作且另一方面進行蓄熱動作的蓄熱式燃燒器，該燃燒動作係利用蓄熱部中收容的蓄熱材所蓄積的熱使燃燒用空氣加熱，並使加熱過之燃燒用空氣經由導引路徑而從給排氣口導引到爐內，使從燃料供給噴嘴供給的燃料與前述加熱過的燃燒用空氣在爐內燃燒，該蓄熱動作係將在爐內之燃燒後的燃燒排放氣體導引到收容有蓄熱材之蓄熱部，使燃燒排放氣體的熱蓄積到蓄熱材；其中，在爐的爐頂部及爐腰部分別設置前述蓄熱式燃燒器，且在設於爐的爐頂部的爐頂部側蓄熱式燃燒器與設於爐的爐腰部的爐腰部側蓄熱式燃燒器交互地切換進行前述燃燒動作及蓄熱動作，一方面在前述爐頂部側蓄熱式燃燒器的燃燒動作時，使前述加熱過的燃燒用空氣一邊沿著形成為筒狀的爐頂部側導引路徑的內周迴旋一邊從爐頂部側給排氣口供給到爐內，而使燃料在爐內一邊迴旋一邊燃燒，且另一方面在前述爐腰部側蓄熱式燃燒器的燃燒動作時，使前述加熱過的燃燒用空氣經由爐腰部側導引路徑而從爐腰部側給排氣口沿著爐內之爐腰部的內周供給，而使燃料一邊沿著爐腰部的內周迴旋一邊燃燒。 In the heat treatment furnace of the present invention, in order to solve the aforementioned problems, a regenerative burner that performs combustion operation on the one hand and heat storage operation on the other is adopted. The heat heats the combustion air, and guides the heated combustion air from the supply and exhaust ports into the furnace through the guide path, so that the fuel supplied from the fuel supply nozzle and the aforementioned heated combustion air are in the furnace Internal combustion, the heat storage action is to guide the combustion exhaust gas after combustion in the furnace to the heat storage part containing the heat storage material, so that the heat of the combustion exhaust gas is stored in the heat storage material; among them, at the top and waist of the furnace The regenerative burners are respectively provided, and the regenerative burners on the top side of the furnace top of the furnace and the regenerative burners on the side of the furnace waist of the furnace alternately switch to perform the combustion operation and the heat storage operation, On the one hand, during the combustion operation of the regenerative burner on the top side of the furnace, the heated combustion air is circulated along the inner circumference of the guide path on the top side of the furnace and exhausted from the top side of the furnace. The port is supplied into the furnace, and the fuel is burned while swirling in the furnace. On the other hand, during the combustion operation of the regenerative burner on the side of the furnace waist, the heated combustion air is passed through the guide path on the side of the furnace On the other hand, the gas supply and exhaust port is supplied along the inner circumference of the waist in the furnace from the side of the furnace waist, so that the fuel is burned while swirling along the inner circumference of the waist.

此處，當如本發明之熱處理爐在設於爐的爐頂部的爐頂部側蓄熱式燃燒器、與設於爐的爐腰部的爐腰部側蓄熱式燃燒器交互地切換進行燃燒動作及蓄熱動作時，就會在爐頂部側蓄熱式燃燒器的燃燒動作時，使加熱過的燃燒用空氣一邊沿著形成為筒狀的爐頂部側導引路徑 的內周迴旋一邊從爐頂部側給排氣口供給到爐內，而使燃料與前述加熱過的燃燒用空氣在爐內一邊迴旋一邊混合而燃燒，並以寬廣的範圍使爐內的中央部加熱，而且使在爐頂部側蓄熱式燃燒器的火焰的長度變短。另外，因為迴旋的渦流的中心部成為負壓，所以會一邊將燃燒排放氣體捲入一邊燃燒，火焰溫度會降低，而可減低NOx的產生量。而且，在爐腰部側蓄熱式燃燒器的燃燒動作時，加熱過的燃燒用空氣會經由爐腰部側導引路徑而從爐腰部側給排氣口沿著爐內之爐腰部的內周供給同時將燃料供入其中，而使其一邊沿著爐腰部的內周迴旋一邊燃燒，使爐內的周邊部加熱。 Here, as in the heat treatment furnace of the present invention, the regenerative burner on the top of the furnace top side of the furnace and the regenerative burner on the waist side of the furnace are alternately switched to perform the combustion operation and the heat storage operation. During the combustion operation of the regenerative burner on the furnace top side, the heated combustion air is swirled along the inner circumference of the tube-shaped furnace top side guide path while exhausting from the furnace top side The fuel and the heated combustion air are mixed and burned while swirling in the furnace, and the central part of the furnace is heated in a wide range, and the regenerative burner is placed on the top side of the furnace. The length of the flame becomes shorter. In addition, since the center of the swirling vortex becomes a negative pressure, the combustion exhaust gas is burned while being drawn, and the flame temperature is lowered, which can reduce the amount of NOx generated. In addition, during the combustion operation of the regenerative burner on the side of the furnace waist, the heated combustion air will be supplied from the side of the furnace to the exhaust port along the inner circumference of the waist of the furnace via the guide path on the side of the furnace. The fuel is fed into it and burned while swirling along the inner circumference of the waist portion of the furnace to heat the peripheral portion in the furnace.

因此，當如上述在設於爐的爐頂部的爐頂部側蓄熱式燃燒器、與設於爐的爐腰部的爐腰部側蓄熱式燃燒器交互地切換進行燃燒動作及蓄熱動作時，就可利用爐頂部側蓄熱式燃燒器及爐腰部側蓄熱式燃燒器的燃燒動作，充分地使爐內全體加熱，而且可減低NOx的產生量。 Therefore, when the regenerative burner on the top side of the furnace top of the furnace and the regenerative burner on the waist side of the furnace alternately switch between the combustion operation and the heat storage operation as described above, it can be used The combustion operation of the regenerative burner on the top side of the furnace and the regenerative burner on the side of the furnace waist fully heats the entire furnace and reduces the amount of NOx generated.

此處，在本發明之熱處理爐中，較宜在前述爐的爐腰部設置複數個爐腰部側蓄熱式燃燒器。如此的話，在爐腰部側蓄熱式燃燒器的燃燒動作時，使加熱過的燃燒用空氣從各爐腰部側蓄熱式燃燒器的各爐腰部側給排氣口分別沿著爐內之爐腰部的內周供給，而適切地使燃料從各爐腰部側給排氣口一邊沿著爐腰部的內周迴旋一邊燃燒，而效率良好地使爐內的周邊部全體加熱。 Here, in the heat treatment furnace of the present invention, it is preferable to install a plurality of furnace waist-side regenerative burners on the waist of the aforementioned furnace. In this case, during the combustion operation of the furnace waist side regenerative burner, the heated combustion air is supplied and exhausted from each furnace waist side of each furnace waist side regenerative burner along the furnace waist in the furnace. The fuel is supplied from the inner circumference, and the fuel is appropriately burned from each furnace waist portion side supply and exhaust port while swirling along the inner circumference of the furnace waist portion, thereby efficiently heating the entire peripheral portion in the furnace.

又，在本發明之熱處理爐中，較宜為在前 述爐頂部側蓄熱式燃燒器的燃燒動作時使燃料在爐內一邊迴旋一邊燃燒之迴旋方向、與在前述爐腰部側蓄熱式燃燒器的燃燒動作時使燃料一邊沿著爐腰部的內周迴旋一邊燃燒之迴旋方向係設為相反方向。如此的話，火焰的迴旋方向就會在爐頂部側蓄熱式燃燒器的燃燒動作時與在爐腰部側蓄熱式燃燒器的燃燒動作時切換，使爐內全體受到攪拌而更均勻地加熱。 Furthermore, in the heat treatment furnace of the present invention, it is preferable to set the swirling direction in which the fuel is combusted while swirling in the furnace during the combustion operation of the regenerative burner on the top side of the furnace, and that of the regenerative burner on the waist side of the furnace is preferred. During the combustion operation, the swirling direction in which the fuel burns while swirling along the inner circumference of the waist portion is set to the opposite direction. In this case, the swirling direction of the flame is switched between the combustion operation of the regenerative burner on the top side of the furnace and the combustion operation of the regenerative burner on the side of the furnace waist, so that the entire furnace is stirred and heated more uniformly.

又，在本發明之熱處理爐中，較宜為在前述爐頂部側蓄熱式燃燒器的燃燒動作時的燃燒量、與在前述爐腰部側蓄熱式燃燒器所有的燃燒動作時的燃燒量係設為相同。如此的話，就可防止由於在爐頂部側蓄熱式燃燒器與在爐腰部側蓄熱式燃燒器的燃燒量之差而在在各自的燃燒時之熱的產生量等產生偏差，而均勻地使爐內全體加熱，也可穩定地進行交互地切換燃燒動作及蓄熱動作之操作。 Furthermore, in the heat treatment furnace of the present invention, it is preferable to set the combustion amount during the combustion operation of the regenerative burner on the top side of the furnace and the combustion amount during all the combustion operations of the regenerative burner on the side of the furnace waist. For the same. In this way, it is possible to prevent the difference in the amount of heat generated during the respective combustion due to the difference in the combustion amount between the regenerative burner on the top side of the furnace and the regenerative burner on the side of the furnace waist, and to uniformly make the furnace The whole interior is heated, and the operation of switching between combustion operation and heat storage operation can also be performed stably.

在本發明之熱處理爐中，在設於爐的爐頂部的爐頂部側蓄熱式燃燒器、與設於爐的爐腰部的爐腰部側蓄熱式燃燒器交互地切換進行燃燒動作及蓄熱動作之際，係在爐頂部側蓄熱式燃燒器的燃燒動作時，使加熱過的燃燒用空氣一邊沿著形成為筒狀的爐頂部側導引路徑的內周迴旋一邊從爐頂部側給排氣口供給到爐內，使燃料從爐頂部側給排氣口開始在爐內一邊迴旋一邊燃燒，使爐內的中央部更廣泛地加熱，並且在爐腰部側蓄熱式燃燒器的燃燒 動作時，使加熱過的燃燒用空氣經由爐腰部側導引路徑而從爐腰部側給排氣口沿著爐內之爐腰部的內周供給，使燃料一邊沿著爐腰部的內周迴旋一邊燃燒，而使爐內的周邊部加熱。 In the heat treatment furnace of the present invention, when the furnace top side regenerative burner provided on the furnace top of the furnace and the furnace waist side regenerative burner provided on the furnace waist part of the furnace alternately switch between the combustion operation and the heat storage operation During the combustion operation of the regenerative burner on the furnace top side, the heated combustion air is supplied to the exhaust port from the furnace top side while swirling along the inner circumference of the tube-shaped furnace top side guide path Into the furnace, the fuel is burned in the furnace while swirling from the top side of the furnace to the exhaust port, so that the central part of the furnace is heated more widely, and when the regenerative burner on the side of the furnace is burning, it is heated The exhausted combustion air is supplied from the furnace waist side to the exhaust port along the inner circumference of the furnace waist in the furnace through the furnace waist side guide path. The inner periphery is heated.

因此，在本發明之熱處理爐中，藉由在設於爐的爐頂部的爐頂部側蓄熱式燃燒器、與設於爐的爐腰部的爐腰部側蓄熱式燃燒器交互地切換進行燃燒動作及蓄熱動作，可在不使火焰接觸到被處理物之情況下充分地使爐內全體加熱而充分地對被處理物進行熱處理，而且可減低NOx的產生量。 Therefore, in the heat treatment furnace of the present invention, the combustion operation is performed by alternately switching between the furnace top side regenerative burner provided on the furnace top of the furnace and the furnace waist side regenerative burner provided on the furnace waist part of the furnace. The heat storage action can fully heat the entire furnace without contacting the object to be treated with flames, and heat the object to be treated sufficiently, and can reduce the amount of NOx generated.

10‧‧‧爐 10‧‧‧Stove

11‧‧‧爐頂部 11‧‧‧Stove top

12‧‧‧爐腰部 12‧‧‧The waist of the furnace

20‧‧‧爐頂部側蓄熱式燃燒器 20‧‧‧Regenerative burner on the top side of the furnace

21‧‧‧爐頂部側給排氣管 21‧‧‧Supply and exhaust pipe on top of furnace

22‧‧‧爐頂部側蓄熱室 22‧‧‧The regenerator at the top of the furnace

22a‧‧‧蓄熱材 22a‧‧‧Heat storage material

23‧‧‧爐頂部側導引路徑 23‧‧‧Survey top side guide path

23a‧‧‧導引部 23a‧‧‧Guiding Department

24‧‧‧爐頂部側給排氣口 24‧‧‧Supply and exhaust port on the top side of the furnace

25‧‧‧爐頂部側燃料供給噴嘴 25‧‧‧The fuel supply nozzle on the top side of the furnace

25a‧‧‧第二爐頂部側燃料供給噴嘴 25a‧‧‧The fuel supply nozzle on the top side of the second furnace

30‧‧‧爐腰部側蓄熱式燃燒器 30‧‧‧Regenerative burner at waist side

31‧‧‧爐腰部側給排氣口 31‧‧‧Supply and exhaust port on side of furnace waist

32‧‧‧爐腰部側導引路徑 32‧‧‧Surveillance side guide path

33‧‧‧爐腰部側燃料供給噴嘴 33‧‧‧Fuel supply nozzle on side of furnace waist

34‧‧‧爐腰部側蓄熱室 34‧‧‧Regenerator at the waist side of the furnace

34a‧‧‧蓄熱材 34a‧‧‧Heat storage material

35‧‧‧爐腰部側給排氣管 35‧‧‧Supply and exhaust pipe on side of furnace waist

第1圖係顯示在本發明之一實施形態的熱處理爐中，設置有設在爐的爐頂部的爐頂部側蓄熱式燃燒器，並且在爐的爐腰部設有兩個爐腰部側蓄熱式燃燒器之狀態，(A)係概略平面圖，(B)係概略側面圖。 Figure 1 shows that in a heat treatment furnace according to an embodiment of the present invention, a furnace top side regenerative burner is provided on the furnace top of the furnace, and two furnace waist side regenerative burners are provided on the furnace waist. The state of the device, (A) is a schematic plan view, (B) is a schematic side view.

第2圖係顯示在前述實施形態的熱處理爐中，一方面在前述爐頂部側蓄熱式燃燒器進行燃燒動作，另一方面在前述爐腰部側蓄熱式燃燒器進行蓄熱動作之狀態，(A)係概略平面圖，(B)係概略側面圖。 Figure 2 shows the heat treatment furnace of the aforementioned embodiment, on the one hand the regenerative burner on the top side of the furnace performs the combustion operation, and on the other hand the regenerative burner on the waist side of the furnace is performing the heat storage operation, (A) It is a schematic plan view, and (B) is a schematic side view.

第3圖係顯示在前述實施形態的熱處理爐中，一方面在前述爐腰部側蓄熱式燃燒器進行燃燒動作，另一方面在前述爐頂部側蓄熱式燃燒器進行蓄熱動作之狀態，(A)係顯示各爐腰部側蓄熱式燃燒器的燃燒狀態之爐腰部側給排氣 口部分的斷面說明圖，(B)係概略側面圖。 Figure 3 shows the heat treatment furnace of the foregoing embodiment, on the one hand, the combustion operation is performed at the regenerative burner on the side of the furnace waist, and the heat storage operation is performed on the regenerative burner on the top of the furnace on the other hand, (A) It is a cross-sectional explanatory view showing the combustion state of the regenerative burner on the waist side of the furnace, and (B) is a schematic side view.

第4圖係顯示在前述實施形態的熱處理爐中，將前述爐頂部側蓄熱式燃燒器中的爐頂部側給排氣口形成為朝向爐內擴張之第一變更例之概略側面圖。 Fig. 4 is a schematic side view showing a first modification example in which the furnace roof side supply and exhaust ports of the furnace roof side regenerative burner are formed to expand toward the furnace in the heat treatment furnace of the aforementioned embodiment.

第5圖係顯示在前述實施形態的熱處理爐中，除了在爐頂部側導引路徑之外，也在爐頂部側給排氣口的兩側設置將燃料供給至前述爐頂部側蓄熱式燃燒器之爐頂部側供給噴嘴之第二變更例之概略平面圖。 Figure 5 shows that in the heat treatment furnace of the foregoing embodiment, in addition to the guide path on the furnace top side, regenerative burners are provided on both sides of the furnace top side supply and exhaust ports to supply fuel to the furnace top side. A schematic plan view of the second modification of the supply nozzle on the top side of the furnace.

第6圖係顯示在前述實施形態的熱處理爐中，在爐的爐腰部設置一個爐腰部側蓄熱式燃燒器之第三變更例之概略平面圖。 Fig. 6 is a schematic plan view showing a third modification example in which a waist-side regenerative burner is provided in the waist of the furnace in the heat treatment furnace of the foregoing embodiment.

第7圖係顯示在前述實施形態的熱處理爐中，爐的爐頂部形成為四角形，且爐腰部形成為四角筒狀之第四變更例之概略平面圖。 Fig. 7 is a schematic plan view showing a fourth modification example in which the furnace top is formed in a quadrangular shape and the furnace waist is formed in a quadrangular cylindrical shape in the heat treatment furnace of the foregoing embodiment.

根據隨附的圖式來具體地說明本發明之實施形態的熱處理爐。再者，本發明之熱處理爐並不限定於下述的實施形態所示的形態，可在未變更發明的要旨之範圍內適當地變更而實施。 The heat treatment furnace of the embodiment of the present invention will be specifically explained based on the attached drawings. In addition, the heat treatment furnace of the present invention is not limited to the form shown in the following embodiment, and can be appropriately modified and implemented within a range that does not change the gist of the invention.

此處，第一實施形態之熱處理爐中係如第1圖(A)、(B)等所示，一方面在爐10中於形成為圓形的爐頂部11的中央部設有爐頂部側蓄熱式燃燒器20，另一方面在爐10之形成為圓筒狀的爐腰部12以隔著爐10的中心部位於相反側的方式設有兩個爐腰部側蓄熱式燃燒器30, 30。 Here, the heat treatment furnace of the first embodiment is shown in Figure 1 (A), (B), etc. On the one hand, in the furnace 10, a furnace top side is provided at the center of a circular furnace top 11 Regenerative burner 20, on the other hand, two regenerative burners 30, 30 on the side of the furnace 10 are provided on the side 12 of the furnace 10 formed in a cylindrical shape so that the central portion of the furnace 10 is located on the opposite side.

而且，一方面如第2圖(A)、(B)所示，當在前述爐頂部側蓄熱式燃燒器20進行燃燒動作時，就在前述兩個爐腰部側蓄熱式燃燒器30,30進行蓄熱動作，且另一方面如第3圖(A)、(B)所示，當在前述兩個爐腰部側蓄熱式燃燒器30,30進行燃燒動作時，就在前述爐頂部側蓄熱式燃燒器20進行蓄熱動作，而在前述爐頂部側蓄熱式燃燒器20與前述兩個爐腰部側蓄熱式燃燒器30,30交互地切換進行燃燒動作及蓄熱動作。 And, on the one hand, as shown in Figures 2 (A) and (B), when the combustion operation is performed on the furnace top side regenerative burner 20, the two furnace waist side regenerative burners 30, 30 are used for the combustion operation. On the other hand, as shown in Figure 3 (A) and (B), when the two furnace waist side regenerative burners 30, 30 perform the combustion operation, the regenerative combustion is performed on the furnace top side. The device 20 performs a heat storage operation, and the furnace top side heat storage type burner 20 and the two furnace waist side heat storage type burners 30, 30 alternately switch between the combustion operation and the heat storage operation.

此處，當在前述爐頂部側蓄熱式燃燒器20進行燃燒動作之際，係如第2圖(A)、(B)所示，從爐頂部側給排氣管21將燃燒用空氣導引至收容有蓄熱材22a之爐頂部側蓄熱室22，利用該蓄熱材22a所蓄積的熱使燃燒用空氣加熱，然後將經此加熱過的燃燒用空氣從導引部23a導引到形成為筒狀之爐頂部側導引路徑23，一邊使其沿著該爐頂部側導引路徑23的內周迴旋一邊從爐頂部側給排氣口24導引到爐10內部，並且從爐頂部側燃料供給噴嘴25供給燃料至如上述方式從爐頂部側給排氣口24被導引到爐10內部之加熱過的燃燒用空氣中。然後，從前述爐頂部側給排氣口24開始使加熱過的燃燒用空氣與燃料一邊迴旋一邊混合，而使其在爐10內部燃燒。如此，當在爐10內部使加熱過的燃燒用空氣與燃料從爐頂部側給排氣口24開始混合而一邊迴旋一邊燃燒時，就會以寬廣的範圍使爐10內部的中央部加熱，而且在爐頂部側蓄熱式燃燒器 20之火焰的長度會變短。 Here, when the regenerative burner 20 on the furnace top side performs the combustion operation, as shown in Figure 2 (A) and (B), the combustion air is guided from the furnace top side to the exhaust pipe 21 To the furnace top side regenerator 22 containing the heat storage material 22a, the heat stored in the heat storage material 22a is used to heat the combustion air, and then the heated combustion air is guided from the guide portion 23a to form a tube The furnace top side guide path 23 is guided along the inner circumference of the furnace top side guide path 23 from the furnace top side supply and exhaust port 24 to the inside of the furnace 10, and fuels from the furnace top side The supply nozzle 25 supplies fuel to the heated combustion air guided into the furnace 10 from the supply and exhaust port 24 on the furnace top side as described above. Then, the heated combustion air and fuel are mixed while swirling from the air supply and exhaust port 24 on the side of the furnace top side, and are combusted in the furnace 10. In this way, when the heated combustion air and fuel are mixed in the furnace 10 from the furnace top side exhaust port 24 and burned while swirling, the central part of the furnace 10 is heated in a wide range, and The length of the flame of the regenerative burner 20 on the top side of the furnace becomes shorter.

另外，當在前述爐頂部側蓄熱式燃燒器20的燃燒動作時於兩個爐腰部側蓄熱式燃燒器30,30進行蓄熱動作之際，係如前述第2圖(A)、(B)所示，從設於各爐腰部側蓄熱式燃燒器30,30之各爐腰部側給排氣口31,31抽吸爐10內部的燃燒排放氣體並將其導引到各爐腰部側導引路徑32,32，且在將連接至各爐腰部側導引路徑32,32之各爐腰部側燃料供給噴嘴33,33關閉的狀態下，經由各爐腰部側導引路徑32,32將燃燒排放氣體導引到分別收容有蓄熱材34a,34a之各爐腰部側蓄熱室34,34，並在使燃燒排放氣體的熱蓄積到各爐腰部側蓄熱室34,34中的蓄熱材34a,34a之後，使蓄熱後的燃燒排放氣體從各爐腰部側蓄熱室34,34內分別經由各爐腰部側給排氣管35,35而導引到外部。 In addition, when the two furnace waist side regenerative burners 30, 30 perform the heat storage operation during the combustion operation of the furnace top side regenerative burner 20, it is as shown in the aforementioned second figures (A) and (B). As shown, the combustion exhaust gas inside the furnace 10 is sucked from each furnace waist side supply and exhaust port 31, 31 of each furnace waist side regenerative burner 30, 30 and guided to each furnace waist side guide path 32, 32, and in a state where the fuel supply nozzles 33, 33 connected to the waist portion side guide paths 32, 32 are closed, the combustion exhaust gas is discharged through the waist portion guide paths 32, 32. It is guided to each of the furnace waist side regenerators 34, 34 in which the heat storage materials 34a, 34a are respectively accommodated, and after the heat of the combustion exhaust gas is stored in the heat storage materials 34a, 34a in the respective furnace waist side regenerators 34, 34, The heat-stored combustion exhaust gas is guided to the outside from the hearth side regenerators 34, 34 via the hearth side supply and exhaust pipes 35, 35, respectively.

此外，當在前述兩個爐腰部側蓄熱式燃燒器30,30進行燃燒動作之際，係如第3圖(A)、(B)所示，從前述各爐腰部側給排氣管35,35將燃燒用空氣導引至分別收容有蓄熱材34a,34a之各爐腰部側蓄熱室34,34，利用各爐腰部側蓄熱室34,34中的蓄熱材34a,34a所蓄積的熱使燃燒用空氣加熱，然後將經此加熱過的燃燒用空氣導引到各爐腰部側導引路徑32,32，並經由各爐腰部側導引路徑32,32而從各爐腰部側給排氣口31,31導引到爐10內部，並且從前述各爐腰部側燃料供給噴嘴33,33對於從各爐腰部側導引路徑32,32被導引到爐10內部之加熱過 的燃燒用空氣供給燃料。然後，使前述加熱過的燃燒用空氣與燃料混合而從各爐腰部側給排氣口31,31沿著爐腰部12的內周供給，使其從各爐腰部側給排氣口31,31沿著爐腰部12的內周一邊朝與前述爐頂部側蓄熱式燃燒器20之情況相反的方向迴旋一邊在爐10內部燃燒。 In addition, when the two furnace waist side regenerative burners 30, 30 perform the combustion operation, as shown in Figure 3 (A) and (B), the supply and exhaust pipes 35, from the furnace waist side, 35 The combustion air is guided to the waist-side regenerators 34, 34 respectively containing the heat storage materials 34a, 34a, and the heat stored in the heat storage materials 34a, 34a in the waist-side regenerators 34, 34 is used to burn It is heated with air, and then the heated combustion air is guided to each furnace waist side guide path 32, 32, and is supplied to the exhaust port from each furnace waist side guide path 32, 32 through each furnace waist side guide path 32, 32 31, 31 are guided to the inside of the furnace 10, and the fuel supply nozzles 33, 33 on the side of the furnace waist are supplied to the heated combustion air guided to the inside of the furnace 10 from the guide paths 32, 32 on the side of the furnace. fuel. Then, the heated combustion air and fuel are mixed and supplied to the exhaust ports 31, 31 from the side of each furnace waist along the inner circumference of the furnace waist 12, so that they are supplied to the exhaust ports 31, 31 from the side of each furnace waist. It burns inside the furnace 10 while turning along the inner circumference of the furnace waist 12 in the opposite direction to the case of the above-mentioned furnace top side regenerative burner 20.

如此一來，在爐頂部側蓄熱式燃燒器20的燃燒動作時與各爐腰部側蓄熱式燃燒器30,30的燃燒動作時火焰的迴旋方向就會切換，而使爐10內部全體受到攪拌而更均勻地加熱。 In this way, the flame rotation direction is switched during the combustion operation of the regenerative burner 20 on the furnace top side and the combustion operation of the regenerative burners 30 and 30 on the side of the furnace waist, so that the entire interior of the furnace 10 is stirred. Heat more evenly.

另外，當在前述各爐腰部側蓄熱式燃燒器30,30的燃燒動作時於前述爐頂部側蓄熱式燃燒器20進行蓄熱動作之際，係如前述第3圖(B)所示，從爐頂部側蓄熱式燃燒器20之前述爐頂部側給排氣口24抽吸爐10內部的燃燒排放氣體並將其導引到爐頂部側導引路徑23，且在將連接至爐頂部側導引路徑23之前述爐頂部側燃料供給噴嘴25關閉的狀態下，經由爐頂部側導引路徑23將燃燒排放氣體導引到收容有蓄熱材22a之爐頂部側蓄熱室22，並在使燃燒排放氣體的熱蓄積到該爐頂部側蓄熱室22中的蓄熱材22a之後，使蓄熱後的燃燒排放氣體從爐頂部側蓄熱室22經由爐頂部側給排氣管21而導引到外部。 In addition, when the furnace top side regenerative burner 20 performs the heat storage operation during the combustion operation of each of the furnace waist side regenerative burners 30, 30, as shown in Figure 3 (B) described above, from the furnace The furnace top side supply and exhaust port 24 of the top side regenerative burner 20 sucks the combustion exhaust gas inside the furnace 10 and guides it to the furnace top side guide path 23, and guides it on the furnace top side With the above-mentioned furnace top side fuel supply nozzle 25 of the path 23 closed, the combustion exhaust gas is guided through the furnace top side guide path 23 to the furnace top side regenerator 22 containing the heat storage material 22a, and the exhaust gas is combusted After the stored heat is accumulated in the heat storage material 22a in the furnace top side regenerator 22, the stored combustion exhaust gas is guided from the furnace top side regenerator 22 through the furnace top side supply and exhaust pipe 21 to the outside.

此處，當如前述方式設為在設於爐10的爐頂部11的爐頂部側蓄熱式燃燒器20與設於爐10的爐腰部12的各爐腰部側蓄熱式燃燒器30,30交互地切換進行燃燒動作及蓄熱動作時，就會在爐頂部側蓄熱式燃燒器20的燃 燒動作時，使加熱過的燃燒用空氣一邊沿著形成為筒狀的爐頂部側導引路徑23的內周迴旋一邊從爐頂部側給排氣口24供給到爐10內部，而使燃料從爐頂部側給排氣口24開始在爐10內部一邊迴旋一邊燃燒，並以寬廣的範圍使爐10內部的中央部加熱，而且使在爐頂部側蓄熱式燃燒器20之火焰的長度變短，而防止火焰接觸到被處理物(未圖示)等而對被處理物造成損傷、或燃燒時的火焰的溫度變高導致NOx的產生量變多等情形。 Here, when the regenerative burner 20 provided on the furnace top 11 of the furnace 10 and the regenerative burners 30, 30 on the furnace waist 12 of the furnace 10 are alternately arranged as described above When the combustion operation and the heat storage operation are switched, the combustion operation of the regenerative burner 20 on the furnace top side will cause the heated combustion air to follow the inner circumference of the furnace top side guide path 23 formed in a cylindrical shape. While turning, the fuel is supplied from the top side of the furnace to the exhaust port 24 to the inside of the furnace 10, and the fuel is started to burn in the furnace 10 while turning from the top side of the furnace to the exhaust port 24, and the center of the furnace 10 is placed in a wide range. Partial heating, and shorten the length of the flame of the regenerative burner 20 on the top side of the furnace, so as to prevent the flame from contacting the processed object (not shown), etc., causing damage to the processed object, or the temperature of the flame during combustion If it becomes higher, the amount of NOx generated will increase.

此外，在各爐腰部側蓄熱式燃燒器30,30的燃燒動作時，加熱過的燃燒用空氣會經由各爐腰部側導引路徑32,32而從各爐腰部側給排氣口31,31分別沿著爐腰部12的內周一邊朝與前述爐頂部側蓄熱式燃燒器20之情況相反的方向迴旋一邊在爐10內部燃燒，而以火焰不會接觸到被處理物之方式使爐10的內周部加熱。 In addition, during the combustion operation of each furnace waist side regenerative burner 30, 30, the heated combustion air passes through each furnace waist side guide path 32, 32 and is supplied to the exhaust ports 31, 31 from the furnace waist side. Respectively along the inner circumference of the furnace waist portion 12 while turning in the opposite direction to the above-mentioned case of the furnace top side regenerative burner 20, they burn inside the furnace 10, and make the furnace 10 so that the flame does not touch the object to be processed. The inner circumference is heated.

其結果，就可藉由前述爐頂部側蓄熱式燃燒器20與各爐腰部側蓄熱式燃燒器30,30的燃燒動作而充分地使爐10內部全體加熱。 As a result, the entire interior of the furnace 10 can be sufficiently heated by the combustion operation of the furnace top side regenerative burner 20 and the respective furnace waist portion side regenerative burners 30, 30.

另外，於如前述方式在爐頂部側蓄熱式燃燒器20與各爐腰部側蓄熱式燃燒器30,30交互地切換進行燃燒動作及蓄熱動作之情況，在前述爐頂部側蓄熱式燃燒器20的燃燒動作時的燃燒量、與在前述各爐腰部側蓄熱式燃燒器30,30所有的燃燒動作時的燃燒量係設為相同。如此一來，於在爐頂部側蓄熱式燃燒器20與各爐腰部側蓄熱式燃燒器30,30交互地切換進行燃燒動作及蓄熱動作之 情況，就可防止在各自的燃燒時之熱的產生量等產生偏差而均勻地使爐10內部全體加熱，也可穩定地進行交互地切換燃燒動作及蓄熱動作之操作。 In addition, in the case where the furnace top side regenerative burner 20 and each furnace waist side regenerative burner 30, 30 alternately switch the combustion operation and the heat storage operation as described above, the furnace top side regenerative burner 20 The amount of combustion during the combustion operation is the same as the amount of combustion during all the combustion operations of the regenerative burners 30 and 30 on the side of each furnace. In this way, when the regenerative burner 20 on the top side of the furnace and the regenerative burner 30, 30 on the side of the furnace alternately switch between the combustion operation and the heat storage operation, it is possible to prevent the generation of heat during the respective combustion. Variations in the amount, etc., uniformly heat the entire interior of the furnace 10, and the operation of alternately switching the combustion operation and the heat storage operation can also be performed stably.

此處，在前述實施形態之熱處理爐中，雖然係使前述爐頂部側蓄熱式燃燒器20的爐頂部側給排氣口24成為與爐頂部側導引路徑23相同的口徑，但亦可如第4圖所示，使爐頂部側給排氣口24的部分形成為R形等以使其朝向爐10內部擴張。如此一來，在使燃燒用空氣一邊沿著前述爐頂部側導引路徑23的內周迴旋一邊從爐頂部側給排氣口24供給到爐10內部之際，即可從形成為朝向爐10內部擴張之爐頂部側給排氣口24以更為擴張之狀態使燃燒用空氣一邊迴旋一邊供給到爐10內部並與燃料混合，以使燃燒時的火焰擴張的更大而使火焰的長度縮短。 Here, in the heat treatment furnace of the foregoing embodiment, although the furnace roof side supply and exhaust port 24 of the furnace roof side regenerative burner 20 has the same diameter as the furnace roof side guide path 23, it may be as As shown in FIG. 4, the part of the supply and exhaust port 24 on the furnace top side is formed in an R shape or the like so as to expand toward the inside of the furnace 10. In this way, when the combustion air is supplied to the inside of the furnace 10 from the furnace top side supply and exhaust port 24 while swirling along the inner circumference of the furnace top side guide path 23, it can be formed to face the furnace 10 The exhaust port 24 on the top side of the furnace with the internal expansion is in a more expanded state, so that the combustion air is supplied into the furnace 10 while swirling and mixed with the fuel, so that the flame during combustion expands more and the length of the flame is shortened. .

又，在前述實施形態之熱處理爐中，雖然係在前述爐頂部側蓄熱式燃燒器20只設為使前述爐頂部側燃料供給噴嘴25連接到爐頂部側給排氣口24附近之爐頂部側導引路徑23，但亦可如第5圖所示，除了前述爐頂部側燃料供給噴嘴25之外，也在前述爐頂部側給排氣口24附近的兩側之爐頂部11分別設置第二爐頂部側燃料供給噴嘴25a,25a。 In the heat treatment furnace of the foregoing embodiment, although the regenerative burner 20 is attached to the furnace top side, only the furnace top side fuel supply nozzle 25 is connected to the furnace top side near the furnace top side air supply and exhaust port 24. The guide path 23, but as shown in Fig. 5, in addition to the fuel supply nozzle 25 on the furnace roof side, second furnace roofs 11 on both sides near the furnace roof side supply and exhaust ports 24 may also be provided. Furnace top side fuel supply nozzles 25a, 25a.

然後，在如上所述的情況中，當不從前述爐頂部側燃料供給噴嘴25供給燃料，而是從設於爐頂部側給排氣口24附近的兩側之爐頂部11的前述各第二爐頂部 側燃料供給噴嘴25a,25a供給燃料至經由前述爐頂部側給排氣口24一邊迴旋一邊被導引到爐10內部的燃燒用空氣中時，就會因為在如前述方式一邊迴旋一邊被導引到爐10內部之燃燒用空氣的迴旋流的中央部產生之負壓而將爐10內部的燃燒排放氣體吸入而進行燃燒，使燃燒時的NOx的產生量減低，而且使從各個第二爐頂部側燃料供給噴嘴25a,25a供給到爐10內部之燃料與從爐頂部側給排氣口24一邊迴旋一邊供給到爐10內部之燃燒用空氣以寬廣的範圍混合而燃燒，使燃燒時的火焰更擴張並使火焰的長度更縮短。 Then, in the above-mentioned case, when the fuel is not supplied from the top side fuel supply nozzle 25, the second section of the top section 11 is provided on both sides near the top side exhaust port 24. When the furnace top side fuel supply nozzles 25a, 25a supply fuel to the furnace top side air supply and exhaust port 24 while swirling while being guided into the combustion air inside the furnace 10, it will be caused to be swirled while swirling as described above. The negative pressure generated in the central part of the swirling flow of combustion air guided to the inside of the furnace 10 sucks in the combustion exhaust gas inside the furnace 10 and burns, so that the amount of NOx generated during combustion is reduced, and the second Furnace top side fuel supply nozzles 25a, 25a supply the fuel into the furnace 10 and the combustion air supplied to the furnace 10 from the furnace top side exhaust port 24 while swirling in a wide range to mix and combust. The flame expands and shortens the length of the flame.

又，在前述實施形態之熱處理爐中，雖然係在爐10之形成為圓筒狀的爐腰部12以隔著爐10的中心部位於相反側的方式設有兩個爐腰部側蓄熱式燃燒器30,30，但設於爐腰部12之爐腰部側蓄熱式燃燒器30的數目並沒有特別的限定，雖未圖示，亦可設置更多的爐腰部側蓄熱式燃燒器30。此外，還可如第6圖所示，在爐10之形成為圓筒狀的爐腰部12設置一個爐腰部側蓄熱式燃燒器30。再者，在此情況，在前述爐頂部側蓄熱式燃燒器20的燃燒動作時的燃燒量、與在前述爐腰部側蓄熱式燃燒器30的燃燒動作時的燃燒量也設為相同，以防止在各自的燃燒時之熱的產生量等產生偏差，而均勻地使爐10內部全體加熱，也可穩定地進行交互地切換燃燒動作及蓄熱動作之操作。 In addition, in the heat treatment furnace of the foregoing embodiment, although the waist portion 12 formed in a cylindrical shape of the furnace 10 is provided with two waist portion side regenerative burners so that the center portion of the furnace 10 is located on the opposite side 30, 30, but the number of the waist side regenerative burners 30 provided in the waist 12 is not particularly limited, although not shown in the figure, more furnace waist side regenerative burners 30 may be provided. In addition, as shown in FIG. 6, a furnace waist portion side regenerative burner 30 may be provided in the furnace waist portion 12 formed in a cylindrical shape of the furnace 10. Furthermore, in this case, the amount of combustion during the combustion operation of the regenerative burner 20 on the furnace top side and the amount of combustion during the combustion operation of the regenerative burner 30 on the side of the furnace waist are also set to be the same to prevent Variations occur in the amount of heat generated during the respective combustions, so that the entire interior of the furnace 10 is uniformly heated, and the operation of alternately switching the combustion operation and the heat storage operation can also be performed stably.

又，在前述實施形態之熱處理爐中，雖然 係採用爐頂部11為圓形且爐腰部12形成為圓筒狀者作為爐10，但爐10的形狀並不特別限定於如此的形狀，亦可如例如第7圖所示，採用爐頂部11為四角形且爐腰部12形成為四角筒狀者，也可以是四角形以上之多角形。 In the heat treatment furnace of the foregoing embodiment, although the furnace top 11 is circular and the furnace waist 12 is formed as the furnace 10, the shape of the furnace 10 is not particularly limited to such a shape, and may be For example, as shown in Fig. 7, the furnace top 11 has a quadrangular shape and the furnace waist 12 is formed in a quadrangular cylindrical shape, or a polygonal shape of a quadrangular or larger shape is used.

10‧‧‧爐 10‧‧‧Stove

11‧‧‧爐頂部 11‧‧‧Stove top

12‧‧‧爐腰部 12‧‧‧The waist of the furnace

20‧‧‧爐頂部側蓄熱式燃燒器 20‧‧‧Regenerative burner on the top side of the furnace

21‧‧‧爐頂部側給排氣管 21‧‧‧Supply and exhaust pipe on top of furnace

22‧‧‧爐頂部側蓄熱室 22‧‧‧The regenerator at the top of the furnace

22a‧‧‧蓄熱材 22a‧‧‧Heat storage material

23‧‧‧爐頂部側導引路徑 23‧‧‧Survey top side guide path

23a‧‧‧導引部 23a‧‧‧Guiding Department

24‧‧‧爐頂部側給排氣口 24‧‧‧Supply and exhaust port on the top side of the furnace

25‧‧‧爐頂部側燃料供給噴嘴 25‧‧‧The fuel supply nozzle on the top side of the furnace

30‧‧‧爐腰部側蓄熱式燃燒器 30‧‧‧Regenerative burner at waist side

31‧‧‧爐腰部側給排氣口 31‧‧‧Supply and exhaust port on side of furnace waist

32‧‧‧爐腰部側導引路徑 32‧‧‧Surveillance side guide path

33‧‧‧爐腰部側燃料供給噴嘴 33‧‧‧Fuel supply nozzle on side of furnace waist

34‧‧‧爐腰部側蓄熱室 34‧‧‧Regenerator at the waist side of the furnace

34a‧‧‧蓄熱材 34a‧‧‧Heat storage material

35‧‧‧爐腰部側給排氣管 35‧‧‧Supply and exhaust pipe on side of furnace waist

Claims (3)

一種熱處理爐，係採用一方面進行燃燒動作且另一方面進行蓄熱動作的蓄熱式燃燒器，該燃燒動作係利用蓄熱部中收容的蓄熱材所蓄積的熱使燃燒用空氣加熱，並使加熱過之燃燒用空氣經由導引路徑而從給排氣口導引到爐內，使從燃料供給噴嘴供給的燃料與前述加熱過的燃燒用空氣在爐內燃燒，該蓄熱動作係將在爐內之燃燒後的燃燒排放氣體導引到收容有蓄熱材之蓄熱部，使燃燒排放氣體的熱蓄積到蓄熱材；其中，在爐的爐頂部及爐腰部分別設置前述蓄熱式燃燒器，且在設於爐的爐頂部的爐頂部側蓄熱式燃燒器與設於爐的爐腰部的爐腰部側蓄熱式燃燒器交互地切換進行前述燃燒動作及蓄熱動作，一方面在前述爐頂部側蓄熱式燃燒器的燃燒動作時，使前述加熱過的燃燒用空氣一邊沿著形成為筒狀的爐頂部側導引路徑的內周迴旋一邊從爐頂部側給排氣口供給到爐內，而使燃料在爐內一邊迴旋一邊燃燒，且另一方面在前述爐腰部側蓄熱式燃燒器的燃燒動作時，使前述加熱過的燃燒用空氣經由爐腰部側導引路徑而從爐腰部側給排氣口沿著爐內之爐腰部的內周供給，而使燃料一邊沿著爐腰部的內周迴旋一邊燃燒；在前述爐頂部側蓄熱式燃燒器的燃燒動作時使燃料在爐內一邊迴旋一邊燃燒之迴旋方向、與在前述爐腰部側蓄熱式燃燒器的燃燒動作時使燃料一邊沿著爐腰部的內周迴旋一邊燃燒之迴旋方向係設為相反方向。 A heat treatment furnace that uses a regenerative burner that performs combustion operation on the one hand and heat storage operation on the other. The combustion operation uses the heat stored in the heat storage material contained in the heat storage unit to heat the combustion air and heat it. The combustion air is guided into the furnace from the supply and exhaust ports through the guide path, so that the fuel supplied from the fuel supply nozzle and the heated combustion air are combusted in the furnace. This heat accumulation action will be in the furnace The combustion exhaust gas after combustion is guided to the heat storage part containing the heat storage material, so that the heat of the combustion exhaust gas is stored in the heat storage material; among them, the above-mentioned heat storage burners are respectively installed on the top and waist of the furnace, and are installed in The regenerative burner on the top side of the furnace top of the furnace and the regenerative burner on the waist side of the furnace alternately switch between the combustion operation and the heat storage operation. On the one hand, the regenerative burner on the top side of the furnace is During the combustion operation, the above-mentioned heated combustion air is supplied into the furnace from the furnace roof side air supply and exhaust port while swirling along the inner circumference of the furnace roof side guide path formed in a cylindrical shape, so that the fuel is in the furnace. While swirling and burning, and on the other hand, during the combustion operation of the furnace waist side regenerative burner, the heated combustion air is guided along the furnace waist side from the furnace waist side air supply and exhaust ports through the furnace waist side guide path. The inner circumference of the inner furnace waist is supplied, and the fuel is burned while swirling along the inner circumference of the furnace; during the combustion operation of the regenerative burner on the top side of the furnace, the fuel is burned while swirling in the furnace. The swirling direction in which the fuel burns while swirling along the inner circumference of the hearth part during the combustion operation of the above-mentioned hearth side regenerative burner is set to the opposite direction. 如申請專利範圍第1項所述之熱處理爐，其中，在前述爐的爐腰部設置有複數個爐腰部側蓄熱式燃燒器。 The heat treatment furnace described in the first item of the scope of patent application, wherein a plurality of regenerative burners on the side of the furnace waist are provided on the waist of the aforementioned furnace. 如申請專利範圍第1項或2項所述之熱處理爐，其中，在前述爐頂部側蓄熱式燃燒器的燃燒動作時的燃燒量、與在前述爐腰部側蓄熱式燃燒器所有的燃燒動作時的燃燒量係設為相同。 The heat treatment furnace described in item 1 or 2 of the scope of the patent application, wherein the combustion amount during the combustion operation of the regenerative burner on the top side of the furnace and the amount of combustion during all the combustion operations on the regenerative burner on the waist side of the furnace The amount of combustion is set to be the same.
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