JP5004564B2 - Burner protection method - Google Patents

Burner protection method Download PDF

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JP5004564B2
JP5004564B2 JP2006313905A JP2006313905A JP5004564B2 JP 5004564 B2 JP5004564 B2 JP 5004564B2 JP 2006313905 A JP2006313905 A JP 2006313905A JP 2006313905 A JP2006313905 A JP 2006313905A JP 5004564 B2 JP5004564 B2 JP 5004564B2
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burner
boric acid
supplied
furnace
flame
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JP2008128555A (en
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宏司 松井
真悟 山田
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Daido Steel Co Ltd
Toyo Glass Co Ltd
AGC Inc
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Daido Steel Co Ltd
Asahi Glass Co Ltd
Toyo Glass Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a burner protection method, not requiring an excess space in a melting furnace, having no risk of contaminating material to be molten in the furnace, and economically preventing corrosion by simple operation. <P>SOLUTION: In this protection method for a burner used for melting material to be processed, the burner is water-cooled, and boric acid is supplied to the inside of a flame of the burner. When the boric acid is supplied to the inside of the flame, it is evaporated and oxidized to become boron trioxide, which is solidified, crystallized and stuck on the outer surface of the burner to form a protective coat. Thus, the conventional protective cylinder as in the prior art is not required, purge gas is also not required, and further the quantity of cooling water can be reduced. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

本発明はバーナの保護方法に関し、更に詳しくは炉内で被処理材を溶融処理するときに用いる下向きで燃焼するバーナの保護方法に関する。焼却飛灰やガラス原料等の被処理材を、バーナを装着した溶融炉で該バーナを下向きで燃焼させることにより溶融処理すると、そのときの高温やそのときに発生する腐食性成分により、該バーナ、特に炉内に晒されている部分の外周面が腐食する。本発明はかかる腐食を簡単な操作で防止できるバーナの保護方法に関する。 The present invention relates to a method of protecting the burner, and more particularly to a method of protecting bar burner which burns in downwardly Ru used when melt processing the material to be treated in a furnace. The material to be treated, such as incineration fly ash and glass materials, when molten processed by burning the burner downward in a melting furnace equipped with a burner, a corrosive component generated when a high temperature and that at that time, the The outer peripheral surface of the burner, especially the part exposed in the furnace, corrodes. The present invention relates to a burner protection method capable of preventing such corrosion by a simple operation.

従来、前記のようなバーナの保護方法として、バーナを耐熱性及び耐腐食性の鋼で製作すること、またバーナを冷却水で冷却すること、更にバーナを耐火物製の保護筒で覆うこと、更にまたバーナと保護筒との間にパージガスを流すこと等が行なわれている（例えば特許文献１参照）。   Conventionally, as a method of protecting the burner as described above, the burner is made of heat-resistant and corrosion-resistant steel, the burner is cooled with cooling water, and the burner is covered with a protective tube made of refractory, Furthermore, a purge gas is allowed to flow between the burner and the protective cylinder (see, for example, Patent Document 1).

しかし、かかる従来法には、バーナを相応に高水準の耐熱性及び耐腐食性の鋼で製作する必要があるため、また相応に大量の冷却水及びパージガスが必要であるため、非経済的という問題があり、更に溶融炉に保護筒を装着するためのスペースを設ける必要があって、しかも保護筒の一部の脱落により炉内の溶融物が汚染するという問題もある。
特開平８−３１２９３８号公報 However, this conventional method is uneconomical because it requires the burner to be made of a correspondingly high level of heat and corrosion resistant steel and requires a correspondingly large amount of cooling water and purge gas. There is a problem, and it is necessary to provide a space for mounting the protective cylinder in the melting furnace, and there is also a problem that the molten material in the furnace is contaminated by dropping off a part of the protective cylinder.
JP-A-8-312938

本発明が解決しようとする課題は、溶融炉に余分なスペースを設ける必要がなく、また炉内の溶融物を汚染するおそれもなく、簡単な操作で経済的に、その腐食を防止できるバーナの保護方法を提供するところにある。   The problem to be solved by the present invention is that there is no need to provide an extra space in the melting furnace, and there is no risk of contaminating the molten material in the furnace. It is to provide a protection method.

前記の課題を解決する本発明は、炉内で被処理材を溶融処理するときに用いる下向きで燃焼するバーナの保護方法であって、バーナを水冷すると共に該バーナの火炎中にホウ酸を供給し、該ホウ酸を蒸発させて、水冷を伴った該バーナの表面に溶融した被処理材と共に該ホウ酸が酸化した三酸化ホウ素を凝固、固着させ、保護層を形成することを特徴とするバーナの保護方法に係る。 The present invention for solving the above problems, the boric a bar burner protection methods of burning downward to Ru used when melt processing the material to be treated in a furnace, the flame of the burner with the burner water cooling the acid was subjected feeding and evaporation of the boric acid, coagulation boron trioxide said boric acid was oxidized with the processed material which is melted on the surface of the burner with water cooling, thereby fixing, that form a protective layer The present invention relates to a method for protecting a burner.

本発明に係るバーナの保護方法では、炉内で被処理材を溶融処理するときに用いる下向きで燃焼するバーナを保護する。都市ごみ等を焼却処理したときに発生する飛灰やガラスの製造に用いるガラス原料等の被処理材を、バーナを装着した溶融炉で該バーナを下向きで燃焼させることにより溶融処理すると、そのときの高温やそのときに発生する塩化ナトリウム、塩素、塩化水素等の腐食性成分により、該バーナ、特に炉内に晒されている部分の外周面が腐食するが、本発明に係るバーナの保護方法ではかかる腐食を簡単な操作で防止する。 The burner of the protection method according to the present invention, to protect the bar burner which burns in downwardly Ru used when melt processing the material to be treated in a furnace. The material to be treated of glass raw material used for the production of fly ash and glass that occurs when the municipal waste or the like has been incinerated, when molten processed by burning the burner downward in a melting furnace equipped with a burner, the The burner, particularly the outer peripheral surface of the portion exposed to the furnace, is corroded by corrosive components such as sodium chloride, chlorine and hydrogen chloride generated at that time, but the burner protection according to the present invention is protected. The method prevents such corrosion with a simple operation.

本発明に係るバーナの保護方法では、バーナを水冷すると共に該バーナの下向きで燃焼する火炎中にホウ酸（Ｈ３ＢＯ３）を供給する。バーナの水冷それ自体は従来と同様に行なうことができる。バーナの火炎中にホウ酸を供給する手段は特に制限されないが、ホウ酸は常温で固体であるため、その粉状体を供給するのが好ましく、またかかる粉状体をバーナの下向きで燃焼する火炎中に確実に供給するため、その下向きの火炎中に、ホウ酸の粉状体を、気体搬送により該バーナ内に形成された流路を介して下向きで供給するのがより好ましい。 The burner of the protection method according to the present invention, supplies the boric acid (H 3 BO 3) the burner fire flame burning downward of the burner as well as water-cooling. The water cooling of the burner itself can be performed in the same manner as before. The means for supplying boric acid into the flame of the burner is not particularly limited. However, since boric acid is a solid at room temperature, it is preferable to supply the powder, and the powder is burned downward in the burner. to reliably supplied into the flames, downward in the flame of its, the powdery body of boric acid, it is more preferable to supply downward through a passage formed in said burner by gas carrying.

バーナそれ自体を水冷することができ、またホウ酸の粉状体を気体搬送により該バーナ内に形成された流路を介して供給することができる、そのようなバーナとしては、それ自体は公知のものを転用でき、例えば特開平８−３１２９３８、特開２０００−５５３４０号公報及び特開２０００−１０３６５６公報等に記載されているようなバーナを転用できる。これらのバーナは、先端部におけるノズル構造が、中心部から外周部に向かい、例えば燃料供給ノズル、一次支燃ガス供給ノズル、被処理材供給ノズル（この場合はホウ酸の粉状体又はこれを含有する被処理材の供給ノズル）及び二次支燃ガス供給ノズルのように複数の供給ノズルが同心円状に配列され、更に最も外周部に冷却水流路が形成されたものからなっている。   The burner itself can be water-cooled, and boric acid powder can be supplied through a flow path formed in the burner by gas conveyance. For example, a burner described in JP-A-8-312938, JP-A-2000-55340, JP-A-2000-103656, and the like can be used. In these burners, the nozzle structure at the tip is directed from the center to the outer periphery, for example, a fuel supply nozzle, a primary combustion gas supply nozzle, a material supply nozzle (in this case, boric acid powder or this A plurality of supply nozzles are arranged concentrically like a supply nozzle for a material to be treated and a secondary combustion gas supply nozzle, and further a cooling water flow path is formed at the outermost periphery.

本発明に係るバーナの保護方法は、前記したように、焼却飛灰やガラス原料等の被処理材を炉内で溶融処理するときに用いるバーナを保護する。したがってホウ酸は、バーナの下向きで燃焼する火炎中にホウ酸含有被処理材の形態で供給するのが好ましく、ホウ酸を５〜４０質量％含有する被処理材の形態で供給するのがより好ましい。被処理材中にもともとホウ酸が含まれる場合は、その含まれる量を見込み、不足分のホウ酸を供給すればよい。一般に溶融処理の当初はホウ酸を多めに供給し、途中からは少なめに供給するのが好ましい。具体的には、バーナの下向きで燃焼する火炎中に、溶融処理の当初はホウ酸の粉状体を２０〜４０質量％含有する被処理材を気体搬送により該バーナ内に形成された流路を介して下向きで供給し、途中からはホウ酸の粉状体を５〜２０質量％含有する被処理材を気体搬送により該バーナ内に形成された流路を介して下向きで供給するのが好ましい。 The method of protecting the burner according to the present invention, as described above, to protect the burner used when melting process the material to be treated, such as incineration fly ash and glass materials in a furnace. Thus boric acid is preferably supplied in the form of boric acid-containing material to be treated in the flames burning at a downward burner, to feed in the form of a treated material containing boric acid 5 to 40 mass% More preferred. When boric acid is originally contained in the material to be treated, the amount contained may be expected and the deficient boric acid may be supplied. Generally, it is preferable to supply a large amount of boric acid at the beginning of the melting treatment and to supply a small amount from the middle. Specifically, in a flame that burns downward in the burner, a flow path formed in the burner by gas conveyance of a material to be treated containing 20 to 40% by mass of boric acid powder at the beginning of the melting process The material to be treated containing 5 to 20% by mass of boric acid powder is supplied downward from the middle through a flow path formed in the burner by gas conveyance. preferable.

保護対象となるバーナの種類は特に制限されないが、大気を支燃ガスとする普通のバーナよりも高温になる酸素バーナについて本発明に係るバーナの保護方法を適用すると、効果の発現が高い。   The type of the burner to be protected is not particularly limited, but when the burner protection method according to the present invention is applied to an oxygen burner having a higher temperature than an ordinary burner using the atmosphere as a combustion supporting gas, the effect is highly expressed.

ホウ酸をバーナの下向きで燃焼する火炎中に供給すると、蒸発し、酸化して三酸化ホウ素（Ｂ２Ｏ３）となり、これが水冷の該バーナの外周面で凝固し、結晶化して固着することにより保護層を形成する。ホウ酸含有被処理材の形態でバーナの下向きで燃焼する火炎中に供給する場合には、前記のように三酸化ホウ素が結晶化して固着する際に、これがあたかもバインダの役目を担って、被処理材から分解生成したＳｉＯ２やＡｌ２Ｏ３等を抱き込んだような状態で固着した保護層を形成する。そしてこれらの保護層がバーナを守り、該バーナが腐食するのを防止する。本発明に係るバーナの保護方法によると、以上説明したような保護層がバーナを守るため、前記した従来法のような保護筒は必要でなく、またパージガスも必要でなく、更に冷却水の量を削減できるのである。 Supplying boric acid fire flame which burns at a downward burner, it evaporated, oxidized to three boron oxide (B 2 O 3) becomes, which solidified on the outer peripheral surface of the water cooling of the burner, fixed and crystallized Thus, a protective layer is formed. When supplying the fire flame which burns at a downward burner in the form of boric acid-containing material to be treated, when the boron trioxide as described above is fixed by crystallization, which though plays a role of binder, A protective layer fixed in a state where SiO 2 or Al 2 O 3 decomposed and generated from the material to be processed is included is formed. These protective layers protect the burner and prevent the burner from corroding. According to the method for protecting a burner according to the present invention, the protective layer as described above protects the burner. Therefore, a protective cylinder as in the conventional method is not necessary, purge gas is not necessary, and the amount of cooling water is further reduced. Can be reduced.

本発明に係るバーナの保護方法によると、保護筒は必要でなく、またパージガスも必要でなく、更に冷却水の量も削減できるため、溶融炉に余分なスペースを設ける必要がなく、また炉内の溶融物を汚染するおそれもなく、バーナの火炎中にホウ酸を供給するという簡単な操作で経済的に、バーナの腐食を防止できるという効果がある。   According to the burner protection method of the present invention, a protective cylinder is not required, purge gas is not required, and the amount of cooling water can be reduced, so there is no need to provide an extra space in the melting furnace. There is no risk of contaminating the molten material, and there is an effect that corrosion of the burner can be prevented economically by a simple operation of supplying boric acid into the burner flame.

図１は本発明に係るバーナの保護方法の実施状態を例示する部分断面図、図２は図１の酸素バーナの先端部を示す拡大底面図である。全体は図示しない溶融炉の天井壁１１に酸素バーナ２１が下向きで取付けられている。酸素バーナ２１は、その先端部におけるノズル配列が、中心部から外周部に向かい、燃料供給ノズル３１、一次支燃ガス供給ノズル３２、被処理材供給ノズル３３及び二次支燃ガス供給ノズル３４の順で同心円状となっており、更に最も外周部に冷却水流路３５が形成されたものからなっている。酸素バーナ２１の燃料供給ノズル３１には燃料供給口４１が、また一次支燃ガス供給ノズル３２には一次支燃ガス供給口４２が、更に被処理材供給ノズル３３には被処理材供給口４３が、更にまた二次支燃ガス供給ノズル３４には二次支燃ガス供給口４４が、そして冷却水流路３５には冷却水供給口４５及び冷却水排出口４６が接続されている。   FIG. 1 is a partial cross-sectional view illustrating an implementation state of a method for protecting a burner according to the present invention, and FIG. 2 is an enlarged bottom view showing a tip portion of the oxygen burner of FIG. The oxygen burner 21 is attached to the ceiling wall 11 of the melting furnace (not shown) so as to face downward. The oxygen burner 21 has a nozzle arrangement at the tip thereof from the center to the outer periphery, and includes a fuel supply nozzle 31, a primary combustion gas supply nozzle 32, a material supply nozzle 33, and a secondary combustion gas supply nozzle 34. Concentric circles are formed in this order, and the cooling water flow path 35 is formed at the outermost peripheral part. The fuel supply nozzle 31 of the oxygen burner 21 has a fuel supply port 41, the primary support gas supply nozzle 32 has a primary support gas supply port 42, and the process material supply nozzle 33 has a process material supply port 43. However, a secondary combustion gas supply port 44 is connected to the secondary combustion gas supply nozzle 34, and a cooling water supply port 45 and a cooling water discharge port 46 are connected to the cooling water channel 35.

図１の実施状態では、燃料供給口４１から燃料供給ノズル３１に灯油を、また一次支燃ガス供給口４２から一次支燃ガス供給ノズル３２及び二次支燃ガス供給口４４から二次支燃ガス供給ノズル３４に酸素濃度９２容量％の支燃ガスを供給して、酸素バーナ２１を下向きで燃焼させ、下向きで燃焼する火炎中に、ホウ酸含有ガラス原料を、気体搬送により被処理物供給口４３から被処理物供給ノズル３３を介して下向きで供給し、溶融処理している。   In the implementation state of FIG. 1, kerosene is supplied from the fuel supply port 41 to the fuel supply nozzle 31, and the secondary combustion support gas is supplied from the primary combustion support gas supply port 42 to the primary combustion support gas supply nozzle 32 and the secondary combustion support gas supply port 44. A combustion support gas having an oxygen concentration of 92% by volume is supplied to the gas supply nozzle 34, the oxygen burner 21 is burned downward, and the boric acid-containing glass raw material is supplied to the object to be processed by gas conveyance into the flame burning downward. The material is supplied downward from the opening 43 via the workpiece supply nozzle 33 and melted.

図１について前述した実施状態にしたがい、冷却水流路３５に冷却水を流しつつ、燃料供給ノズル３１に灯油を、また一次支燃ガス供給ノズル３３及び二次支燃ガス供給ノズル３４に酸素濃度９２容量％の支燃ガスを供給して、その燃焼率を次第に上げながら酸素バーナ２１を下向きで燃焼させた。燃焼率が１００％に達したときの炉内雰囲気温度は１３００℃となっており、冷却水の供給口温度は３０℃、排出口温度は４４℃であった。ここで、下向きに燃焼する火炎中に、Ｈ３ＢＯ３：２５％（質量％、以下同じ）、ＳｉＯ２：４０％、ＢａＣＯ３：２６％、Ａｌ２Ｏ３：８％及びＳｂ２Ｏ３：１％（合計１００％）のホウ酸含有ガラス原料を気体搬送により被処理材供給口４３から被処理材供給ノズル３３を介して下向きで供給し、溶融処理した。溶融処理中の炉内雰囲気温度は１３００〜１４００℃であり、冷却水の供給口温度は３０℃、排出口温度は３９℃であった。酸素バーナ２１の炉内に晒されている部分の外周面に保護層５１が形成され、この保護層５１が冷却水の排出口温度を４４℃から３９℃へと５℃降下させたものと考えられた。 In accordance with the state of implementation described above with reference to FIG. 1, kerosene is supplied to the fuel supply nozzle 31 while the cooling water is flowing through the cooling water flow path 35, and the oxygen concentration 92 is applied to the primary support gas supply nozzle 33 and the secondary support gas supply nozzle 34. A volume% combustion support gas was supplied, and the oxygen burner 21 was burned downward while gradually increasing the combustion rate. The furnace atmosphere temperature when the combustion rate reached 100% was 1300 ° C., the cooling water supply port temperature was 30 ° C., and the discharge port temperature was 44 ° C. Here, in the flame burning downward, H 3 BO 3 : 25% (mass%, the same applies hereinafter), SiO 2 : 40%, BaCO 3 : 26%, Al 2 O 3 : 8% and Sb 2 O 3 1% (100% in total) of boric acid-containing glass raw material was supplied downward from the processing material supply port 43 via the processing material supply nozzle 33 by gas conveyance, and melted. The furnace atmosphere temperature during the melting treatment was 1300 to 1400 ° C, the cooling water supply port temperature was 30 ° C, and the discharge port temperature was 39 ° C. It is considered that a protective layer 51 is formed on the outer peripheral surface of the portion of the oxygen burner 21 exposed to the furnace, and this protective layer 51 has lowered the cooling water outlet temperature by 5 ° C. from 44 ° C. to 39 ° C. It was.

次に、ホウ酸含有ガラス原料の供給を中止し、酸素バーナ２１の燃焼率を８５％まで絞ったところ、炉内雰囲気温度は１１００〜１２００℃となり、冷却水の供給口温度は３０℃、排出口温度は４２℃となった。ホウ酸含有ガラス原料の供給を中止したため、前記の保護層５１の一部が消失し、冷却水の排出口温度を３９℃から４２℃へと３℃上昇させたものと考えられた。そこで再び、ホウ酸含有ガラス原料を供給し、酸素バーナ２１の燃焼率を１００％にしたところ、炉内雰囲気温度は１３００〜１４００℃となり、冷却水の供給口温度は３０℃、排出口温度は３９℃となった。ホウ酸含有ガラス原料の供給再開により、前記の保護層５１が回復し、冷却水の排出口温度を４２℃から３９℃へと３℃降下させたものと考えられた。   Next, when the supply of the boric acid-containing glass raw material was stopped and the combustion rate of the oxygen burner 21 was reduced to 85%, the furnace atmosphere temperature was 1100 to 1200 ° C, the cooling water supply port temperature was 30 ° C, The outlet temperature was 42 ° C. Since the supply of the boric acid-containing glass raw material was stopped, part of the protective layer 51 disappeared, and the cooling water outlet temperature was considered to be increased by 3 ° C. from 39 ° C. to 42 ° C. Therefore, when the boric acid-containing glass raw material was again supplied and the combustion rate of the oxygen burner 21 was set to 100%, the furnace atmosphere temperature was 1300 to 1400 ° C., the cooling water supply port temperature was 30 ° C., and the discharge port temperature was It became 39 degreeC. It was considered that the supply of the boric acid-containing glass raw material resumed the protective layer 51 and lowered the cooling water outlet temperature by 3 ° C. from 42 ° C. to 39 ° C.

ここで酸素バーナ２１の燃焼やホウ酸含有ガラス原料の供給を停止し、酸素バーナ２１を炉外へ引上げて、炉内に晒されていた部分を観察したところ、その部分の外周面に緻密な保護層５１が固着していた。この保護層５１を削り取ったところ、その下から現れた酸素バーナ２１の外周面には殆ど腐食が認められなかった。併せて、削り取ったものを分析したところ、Ｂ２Ｏ３：３３％、ＳｉＯ２：３５％、ＢａＯ：１７％、Ａｌ２Ｏ３：７％、Ｃ：５％、その他３％（合計１００％）の組成のものであった。 Here, the combustion of the oxygen burner 21 and the supply of the boric acid-containing glass material were stopped, the oxygen burner 21 was pulled out of the furnace, and the portion exposed to the furnace was observed. The protective layer 51 was fixed. When this protective layer 51 was scraped off, almost no corrosion was observed on the outer peripheral surface of the oxygen burner 21 that appeared from below. In addition, when the scraped material was analyzed, B 2 O 3 : 33%, SiO 2 : 35%, BaO: 17%, Al 2 O 3 : 7%, C: 5%, and other 3% (total 100% ).

本発明に係るバーナの保護方法の実施状態を例示する部分断面図。The fragmentary sectional view which illustrates the implementation state of the protection method of the burner concerning the present invention. 図１の酸素バーナの先端部を示す拡大底面図。The enlarged bottom view which shows the front-end | tip part of the oxygen burner of FIG.

１１ 天井壁
２１ 酸素バーナ
３１ 燃料供給ノズル
３２ 一次支燃ガス供給ノズル
３３ 被処理材供給ノズル
３４ 二次支燃ガス供給ノズル
３５ 冷却水流路
５１ 保護層 DESCRIPTION OF SYMBOLS 11 Ceiling wall 21 Oxygen burner 31 Fuel supply nozzle 32 Primary combustion support gas supply nozzle 33 Material to be processed supply nozzle 34 Secondary combustion support gas supply nozzle 35 Cooling water flow path 51 Protective layer

Claims (5)

炉内で被処理材を溶融処理するときに用いる下向きで燃焼するバーナの保護方法であって、バーナを水冷すると共に該バーナの火炎中にホウ酸を供給し、該ホウ酸を蒸発させて、水冷を伴った該バーナの表面に溶融した被処理材と共に該ホウ酸が酸化した三酸化ホウ素を凝固、固着させ、保護層を形成することを特徴とするバーナの保護方法。 A bar burner protection methods of burning downward to Ru used when melt processing the material to be treated in a furnace, boric acid and subjected fed into the flame of the burner as well as water-cooled burner, the boric acid evaporation solidified boron trioxide to the boric acid was oxidized with the processed material which is melted on the surface of the burner with a water-cooled, thereby fixing the burner protection methods characterized that you form a protective layer. バーナの下向きで燃焼する火炎中に、ホウ酸を、気体搬送により、該バーナ内に形成された流路を介して下向きで供給する請求項１記載のバーナの保護方法。   The method for protecting a burner according to claim 1, wherein boric acid is supplied downwardly through a flow path formed in the burner by gas conveyance into a flame burning downward. ホウ酸をホウ酸含有被処理材の形態で供給する請求項１又は２記載のバーナの保護方法。   The method for protecting a burner according to claim 1 or 2, wherein boric acid is supplied in the form of a boric acid-containing material. ホウ酸含有被処理材がホウ酸を５〜４０質量％含有するものである請求項３記載のバーナの保護方法。   The method for protecting a burner according to claim 3, wherein the boric acid-containing material contains 5 to 40% by mass of boric acid. バーナが酸素バーナである請求項１〜４のいずれか一つの項記載のバーナの保護方法。   The burner protection method according to any one of claims 1 to 4, wherein the burner is an oxygen burner.
JP2006313905A 2006-11-21 2006-11-21 Burner protection method Expired - Fee Related JP5004564B2 (en)

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