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JP2017040429A - Method and apparatus for burning silane inclusion gas or silane inclusion waste liquid - Google Patents

Method and apparatus for burning silane inclusion gas or silane inclusion waste liquid Download PDF

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JP2017040429A
JP2017040429A JP2015162201A JP2015162201A JP2017040429A JP 2017040429 A JP2017040429 A JP 2017040429A JP 2015162201 A JP2015162201 A JP 2015162201A JP 2015162201 A JP2015162201 A JP 2015162201A JP 2017040429 A JP2017040429 A JP 2017040429A
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silane
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waste liquid
furnace
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JP6410185B2 (en
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山口 展弘
Nobuhiro Yamaguchi
展弘 山口
田屋舘 利夫
Toshio Tayadate
利夫 田屋舘
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Tsukishima Kankyo Engineering Ltd
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Abstract

PROBLEM TO BE SOLVED: To prevent adhesion or clogging of silicone dioxide [SiO] to a nozzle or a furnace wall.SOLUTION: There is provided a combustion burner operated by fuel and combustion air at an upper part of a combustion furnace to face downward when silane inclusion gas, silane inclusion gas of silane inclusion waste liquid or silane inclusion waste liquid is supplied to the combustion furnace and ignited. There are provided blowing-out nozzles at a position below the combustion burner. The blowing-out nozzles have a flow passage for silane inclusion gas or silane inclusion waste liquid, inert gas flow passage and a combustion air flow passage extending from a central side toward outside, the nozzles are used for blowing out each of fluids from each of flow passages of the blowing-out nozzles to a position below a lower end of a flame generated by the combustion burner.SELECTED DRAWING: Figure 2

Description

本発明は、半導体工場等から排出されるシラン含有ガス又はシラン含有廃液の燃焼方法及び燃焼装置に関するものである。
ここに、シランとは、SiH4(モノシラン)、Si26(ジシラン)、Si(CH3O)4(テトラメトキシシラン)のようにSi、H、Oの化合物だけでなく、SiH2Cl2(ジクロロシラン)のようにClを含有した化合物も指称するものである。
The present invention relates to a combustion method and combustion apparatus for silane-containing gas or silane-containing waste liquid discharged from a semiconductor factory or the like.
Here, silane is not only a compound of Si, H, O such as SiH 4 (monosilane), Si 2 H 6 (disilane), Si (CH 3 O) 4 (tetramethoxysilane), but also SiH 2 Cl. 2 A compound containing Cl such as (dichlorosilane) is also referred to.

半導体工場等から排出されるシラン含有ガス又はシラン含有廃液は、有害物質を含有するためにそのまま系外に放出することができないので、無害化処理を行わなければならない。このような無害化処理の一手段として、シラン含有ガス又はシラン含有廃液を燃焼炉に噴霧して高温で燃焼させることによる高温酸化処理が多用されている。   Since the silane-containing gas or the silane-containing waste liquid discharged from a semiconductor factory or the like cannot be discharged out of the system as it is because it contains harmful substances, it must be detoxified. As one means for such detoxification treatment, high-temperature oxidation treatment by spraying a silane-containing gas or a silane-containing waste liquid on a combustion furnace and burning it at a high temperature is frequently used.

代表的には、特許文献1に提案されたものがある。この先行技術は、その第3図に示されているように、炉の頂部中央に設けられる主バーナーが、4重管構造をもち、中心から外方にかけて被処理ガスの流路、不活性ガスの流路、一次空気流路、二次空気流路が形成されたものである。   Typically, there is one proposed in Patent Document 1. In this prior art, as shown in FIG. 3, the main burner provided at the center of the top of the furnace has a quadruple tube structure, and the flow path of the gas to be processed from the center to the outside, the inert gas , Primary air flow path, and secondary air flow path are formed.

また、側部にはパイロットバーナーが必要により設けられ、着火を容易にしている。この先行技術では、主バーナーの火炎が、パイロットバーナーからの吹き出し中心線より下方に設けて、安定した火炎を得ることを目的としている。   Further, a pilot burner is provided on the side portion as necessary to facilitate ignition. In this prior art, the flame of the main burner is provided below the blowing center line from the pilot burner, and an object is to obtain a stable flame.

他方、下部には水スプレー管を設け、水による冷却を図っている。   On the other hand, a water spray tube is provided at the lower part to cool the water.

特公平5−48584号公報Japanese Patent Publication No. 5-48584

本発明者は先行技術を種々検討したが、適切なものを得ることができなかった。
特に、特許文献1のように、シラン含有ガスの吹き出し流路を主バーナーに組み込むと、優に1000℃を超える火炎中にシラン含有ガスを噴出することになるので、シラン中の珪素(Si)と酸素(O2)または水蒸気(H2O)と反応して生成した二酸化珪素(SiO2)が溶融または焼結して、炉内壁やノズルに付着し、ノズルの閉塞を招く、あるいは炉内壁への堆積によっては燃焼が安定しない、または炉内の閉塞などの問題を招くことを知見した。
The present inventor has examined various prior arts, but could not obtain an appropriate one.
In particular, as in Patent Document 1, when a silane-containing gas blowing channel is incorporated in a main burner, the silane-containing gas is jetted into a flame that exceeds 1000 ° C., so silicon (Si) in silane And silicon dioxide (SiO 2 ) produced by reacting with oxygen (O 2 ) or water vapor (H 2 O) melts or sinters and adheres to the furnace inner wall and nozzle, causing nozzle clogging, or the furnace inner wall It has been found that depending on the deposition, the combustion becomes unstable or causes problems such as blockage in the furnace.

一方、シラン含有ガスやシラン含有廃液を燃焼処理する際に、二酸化珪素(SiO2)による炉内壁等への付着、閉塞が生じることは既に知られており、次の対策を採る技術もある。
(1)炉壁に複数の開孔を設け、炉壁全体から炉内に向けて空気を供給し炉壁表面温度を溶融及び焼結温度以下として付着、閉塞を防止する。
(2)炉壁に水冷ジャケットの設置、炉壁全体から炉内へ空気を供給することで炉壁表面温度(燃焼炉の内部を構成する鋼材の表面温度)を溶融及び焼結温度以下として付着、閉塞を防止する。
On the other hand, when silane-containing gas or silane-containing waste liquid is burned, it is already known that silicon dioxide (SiO 2 ) adheres to and clogs the inner wall of the furnace, and there is a technique for taking the following measures.
(1) A plurality of apertures are provided in the furnace wall, air is supplied from the entire furnace wall into the furnace, and the furnace wall surface temperature is kept below the melting and sintering temperature to prevent adhesion and blockage.
(2) Installation of a water cooling jacket on the furnace wall and supplying air from the entire furnace wall into the furnace causes the furnace wall surface temperature (the surface temperature of the steel material constituting the interior of the combustion furnace) to adhere below the melting and sintering temperature. Prevent occlusion.

しかし、(1)の方策では、炉壁の構造が複雑となりコスト高となる。また、(2)の方策を採用して、塩素(Cl)を含有するシラン含有ガスやシラン含有廃液を処理した場合、溶融焼結対策として冷却された炉壁表面によって炉内で生成した塩化水素(HCl)が露点以下(70〜80℃以下)となり腐食が発生する。   However, in the measure (1), the structure of the furnace wall becomes complicated and the cost becomes high. In addition, when the measure (2) is adopted to treat a silane-containing gas containing chlorine (Cl) or a silane-containing waste liquid, hydrogen chloride produced in the furnace by the cooled furnace wall surface as a measure against melting and sintering. (HCl) becomes the dew point or lower (70 to 80 ° C. or lower) and corrosion occurs.

そこで本発明の主たる課題は、ノズルや炉内壁への二酸化珪素(SiO2)の付着又は閉塞を防止することにある。 Therefore, a main object of the present invention is to prevent adhesion or blockage of silicon dioxide (SiO 2 ) to the nozzle and the inner wall of the furnace.

上記課題を解決した本発明は次記のとおりである。
本発明は、シラン含有ガスの場合とシラン含有廃液の場合がある。
The present invention that has solved the above problems is as follows.
The present invention may be a silane-containing gas or a silane-containing waste liquid.

本発明のシラン含有ガス又はシラン含有廃液の燃焼方法は、シシラン含有ガス又はシラン含有廃液を燃焼炉に供給して燃焼する方法において、
燃焼炉の上部に、下向きに燃料と燃焼空気による燃焼バーナーを設け、
それより下方の位置に吹出しノズルを設け、このノズルは、その中心側から外方側に向けて、シラン含有ガス又はシラン含有廃液の流路、不活性ガス流路、燃焼空気流路を有しており、
前記燃焼バーナーによって生成される火炎の下端より下方位置に、前記吹出しノズルの各流路から各流体を吹出すものである。
In the method of burning the silane-containing gas or silane-containing waste liquid of the present invention, the silane-containing gas or silane-containing waste liquid is supplied to the combustion furnace and burned.
At the top of the combustion furnace, a combustion burner with fuel and combustion air is installed downward,
A blowing nozzle is provided at a position below it, and this nozzle has a flow path of silane-containing gas or silane-containing waste liquid, an inert gas flow path, and a combustion air flow path from the center side to the outer side. And
Each fluid is blown out from each flow path of the blowing nozzle to a position below the lower end of the flame generated by the combustion burner.

本発明の形態では、燃焼バーナーの火炎の前方における高温酸化雰囲気中に向けて、吹出しノズルからのシラン含有ガス又はシラン含有廃液、不活性ガス、燃焼空気を噴出する。このとき、シラン含有ガス又はシラン含有廃液の流れは、不活性ガスの流れに包まれるようになる。したがって、シラン含有ガス又はシラン含有廃液の流れと燃焼空気の流れとの接触が遮られ、あるいは接触が阻害されるので、吹出しノズルでの二酸化珪素(SiO2)の付着や閉塞が防止される。
加えて、シラン含有ガス又はシラン含有廃液は燃焼バーナーの火炎に供給することなく、燃焼バーナーの火炎より下方に供給する。
In the embodiment of the present invention, the silane-containing gas or the silane-containing waste liquid, the inert gas, and the combustion air are blown out from the blowing nozzle toward the high-temperature oxidizing atmosphere in front of the flame of the combustion burner. At this time, the flow of the silane-containing gas or the silane-containing waste liquid is wrapped in the flow of the inert gas. Therefore, the contact between the flow of the silane-containing gas or the silane-containing waste liquid and the flow of the combustion air is blocked, or the contact is hindered, so that the silicon dioxide (SiO 2 ) is prevented from adhering or blocking at the blowing nozzle.
In addition, the silane-containing gas or the silane-containing waste liquid is supplied below the combustion burner flame without being supplied to the combustion burner flame.

その結果、シラン中の珪素(Si)が酸素(O2)または水蒸気(H2O)と反応して生成した二酸化珪素(SiO2)が、溶融または焼結して炉内壁や供給ノズルに付着し、付着したものが成長して閉塞することを防止できる。
また、本発明によれば、燃焼炉の構造を複雑にすることなく燃焼状態を制御することにより、二酸化珪素(SiO2)の溶融または焼結によりノズルや炉内壁への付着、閉塞を防止することができる。
As a result, silicon dioxide (SiO 2 ) produced by reaction of silicon (Si) in silane with oxygen (O 2 ) or water vapor (H 2 O) melts or sinters and adheres to the furnace inner wall and supply nozzle. In addition, it is possible to prevent the adhered matter from growing and clogging.
In addition, according to the present invention, by controlling the combustion state without complicating the structure of the combustion furnace, adhesion or blockage to the nozzle or the inner wall of the furnace is prevented by melting or sintering silicon dioxide (SiO 2 ). be able to.

吹出しノズルとしては、多重管構造を有するものが望ましい。その中心側から外方側に向けて、シラン含有ガス又はシラン含有廃液の流路、不活性ガス流路、燃焼空気流路とされるものが好適である。
かかる多重管構造の吹出しノズルは、前述のように、シラン含有ガス又はシラン含有廃液の流れを、不活性ガスの流れによって包むことができる。
The blowout nozzle preferably has a multi-tube structure. From the center side toward the outer side, a silane-containing gas or a silane-containing waste liquid channel, an inert gas channel, or a combustion air channel is preferable.
Such a multi-tube blow-out nozzle can wrap the flow of silane-containing gas or silane-containing waste liquid with the flow of inert gas, as described above.

さらに、シラン含有ガス又はシラン含有廃液の流路の出口に対して、不活性ガス流路の出口が同一か前方に位置していると、シラン含有ガス又はシラン含有廃液の流れを、不活性ガスの流れによって包みながら、燃焼空気の流れとの接触を阻害できるようになる。   Furthermore, when the outlet of the inert gas flow path is the same or forward with respect to the outlet of the flow path of the silane-containing gas or the silane-containing waste liquid, the flow of the silane-containing gas or the silane-containing waste liquid is changed to the inert gas. It becomes possible to inhibit the contact with the flow of combustion air while being wrapped by the flow of gas.

この作用をより確実なものとするために、不活性ガス流路の出口に対して、燃焼空気流路の出口が後方に位置しているのがより望ましい。   In order to make this action more reliable, it is more desirable that the outlet of the combustion air channel is located behind the outlet of the inert gas channel.

以上のようにして、シラン中の珪素(Si)が酸素(O2)または水蒸気(H2O)と反応して生成した二酸化珪素(SiO2)が溶融または焼結して炉内壁や供給ノズルに付着し、付着したものが成長して閉塞することを防止できる。 As described above, silicon dioxide (SiO 2 ) produced by the reaction of silicon (Si) in silane with oxygen (O 2 ) or water vapor (H 2 O) melts or sinters, and the inner wall of the furnace and the supply nozzle It is possible to prevent the adhered material from growing and clogging.

不活性ガス流路の出口での不活性ガスの流速を2〜10m/sec、またはシラン含有ガス又はシラン含有廃液1kgに対して0.3〜6.0Nm3の範囲とすることができる。 The flow rate of the inert gas at the outlet of the inert gas flow path can be in the range of 2 to 10 m / sec, or 0.3 to 6.0 Nm 3 with respect to 1 kg of the silane-containing gas or the silane-containing waste liquid.

他方、燃焼バーナーによる火炎の中心線と、吹出しノズルの各流路からの各流体の指向線との交点より下方位置に設けた上部温度検出器による炉内上部温度に対して、前記上部温度検出器より下方位置に設けた炉内下部温度器による炉内下部温度が高くなる操作を行う。
この操作としては、吹き出しノズルから供給される不活性ガス、燃焼空気、シラン含有ガス又はシラン含有廃液の各供給量のうち少なくとも1つを調整する操作を挙げることができる。
炉内下部温度を1000℃未満、850℃以上とするのが好適である。
On the other hand, the upper temperature detection with respect to the upper temperature in the furnace by the upper temperature detector provided at a position below the intersection of the center line of the flame by the combustion burner and the directivity line of each fluid from each flow path of the blowing nozzle The operation of raising the temperature in the lower part of the furnace by means of the lower part of the furnace in the furnace located below the furnace is performed.
As this operation, operation which adjusts at least 1 among each supply amount of the inert gas supplied from a blowing nozzle, combustion air, silane containing gas, or a silane containing waste liquid can be mentioned.
It is preferable that the lower temperature in the furnace is lower than 1000 ° C. and 850 ° C. or higher.

このことの意味は次のとおりである。
不活性ガスである窒素および空気による冷却効果、並びに窒素による処理要素の阻害を原因とする燃焼遅延効果により、シラン含有ガス又はシラン含有廃液の燃焼領域を炉下方まで拡大させることができる。
したがって、燃焼バーナー火炎より前方の温度を二酸化珪素(SiO2)が焼結を起こす温度の約1000℃未満に抑制できる。その結果、炉内壁への二酸化珪素(SiO2)の付着を防止することができる。
さらにシラン含有ガス又はシラン含有廃液が高カロリーな場合は、窒素による燃焼遅延効果がより働きバーナー火炎前方の温度より炉下方の温度が高くなる。よって、炉内下部温度器による炉内下部温度に基づく、温度制御のみで二酸化珪素(SiO2)の溶融、焼結防止が行え、ノズル及び炉内壁において二酸化珪素(SiO2)が付着、閉塞することを防止することができる。
また塩素(Cl)を含有するシラン含有ガス又はシラン含有廃液を処理する場合においても、炉壁表面温度を抑制する従来技術ではなく、耐火物を適切な厚みとすることで表面温度を露点腐食温度以上(70〜80℃以上)の温度に維持することができ、鋼材の腐食を防止できる。
The meaning of this is as follows.
The combustion region of the silane-containing gas or the silane-containing waste liquid can be expanded to the lower part of the furnace due to the cooling effect by nitrogen and air, which are inert gases, and the combustion delay effect due to the inhibition of the treatment element by nitrogen.
Therefore, the temperature in front of the combustion burner flame can be suppressed to less than about 1000 ° C., which is the temperature at which silicon dioxide (SiO 2 ) sinters. As a result, adhesion of silicon dioxide (SiO 2 ) to the furnace inner wall can be prevented.
Furthermore, when the silane-containing gas or the silane-containing waste liquid is high in calories, the combustion delay effect due to nitrogen is more effective, and the temperature below the furnace becomes higher than the temperature in front of the burner flame. Therefore, melting and sintering of silicon dioxide (SiO 2 ) can be prevented only by temperature control based on the temperature in the furnace lower part by the furnace lower temperature vessel, and silicon dioxide (SiO 2 ) adheres and closes on the nozzle and the furnace inner wall. This can be prevented.
In addition, when treating a silane-containing gas or silane-containing waste liquid containing chlorine (Cl), the surface temperature is set to a dew point corrosion temperature by setting the refractory to an appropriate thickness instead of the conventional technique for suppressing the furnace wall surface temperature. It can be maintained at the above temperature (70 to 80 ° C. or higher), and corrosion of the steel material can be prevented.

本発明装置は、シラン含有ガス又はシラン含有廃液を燃焼炉に供給して燃焼する装置であって、
燃焼炉と、この燃焼炉の上部に、下向きに設けられた燃料と燃焼空気による燃焼バーナーと、燃焼バーナーの下方に設けられた吹出しノズルとを含み、
前記を吹出しノズルは、その中心側から外方側に向けて、シラン含有ガス又はシラン含有廃液の流路、不活性ガス流路、燃焼空気流路を有していることを特徴とするものである。
その燃焼装置によれば、前述の本発明の燃焼方法を達成できる。
The apparatus of the present invention is an apparatus for supplying and burning a silane-containing gas or a silane-containing waste liquid to a combustion furnace,
Including a combustion furnace, a combustion burner with fuel and combustion air provided downward in the upper part of the combustion furnace, and a blowout nozzle provided below the combustion burner,
The blowing nozzle has a silane-containing gas or a silane-containing waste liquid passage, an inert gas passage, and a combustion air passage from the center side toward the outer side. is there.
According to the combustion apparatus, the combustion method of the present invention described above can be achieved.

さらに、吹出しノズルは多重管構造を有し、その中心側から外方側に向けて、シラン含有ガス又はシラン含有廃液の流路、不活性ガス流路、燃焼空気流路とされ、
シラン含有ガス又はシラン含有廃液の流路の出口に対して、不活性ガス流路の出口が同一か前方に位置しており、並びに前記不活性ガス流路の出口に対して、燃焼空気流路の出口が後方に位置している燃焼装置構成であるのが、より望ましい。
Furthermore, the blowout nozzle has a multi-tube structure, and from the center side toward the outer side, a flow path of silane-containing gas or silane-containing waste liquid, an inert gas flow path, a combustion air flow path,
The outlet of the inert gas flow path is the same as or forward of the outlet of the flow path of the silane-containing gas or the silane-containing waste liquid, and the combustion air flow path with respect to the outlet of the inert gas flow path It is more desirable that the combustion apparatus has a rear outlet located at the rear.

本発明によれば、吹出しノズルや炉内壁への二酸化珪素(SiO2)の付着を防止できる。
具体的には、シラン中の珪素(Si)が酸素(O2)または水蒸気(H2O)と反応して生成した二酸化珪素(SiO2)が溶融または焼結して炉内壁や吹出しノズルに付着し、付着したものが成長して閉塞することを防止できる。
According to the present invention, it is possible to prevent silicon dioxide (SiO 2 ) from adhering to the blowing nozzle and the inner wall of the furnace.
Specifically, silicon dioxide (SiO 2 ) produced by the reaction of silicon (Si) in silane with oxygen (O 2 ) or water vapor (H 2 O) melts or sinters to the inner wall of the furnace or the blowout nozzle. It is possible to prevent the attached material from growing and clogging.

燃焼装置例の概要図である。It is a schematic diagram of the example of a combustion device. 炉内での燃焼例の説明用の縦断面図である。It is a longitudinal cross-sectional view for description of the example of combustion in a furnace. 吹出しノズル例の縦断面図である。It is a longitudinal cross-sectional view of the example of a blowing nozzle.

以下、本発明に係るシラン含有ガス又はシラン含有廃液の燃焼方法及び燃焼装置の好適な実施例について、図面を参照しながら説明する。なお、以下の説明文及び図面は、本発明の実施形態の一例を示したものにすぎず、本発明の内容をこの実施形態に限定して解釈すべきでない。   Hereinafter, preferred embodiments of a combustion method and combustion apparatus for a silane-containing gas or a silane-containing waste liquid according to the present invention will be described with reference to the drawings. The following description and drawings are merely examples of the embodiment of the present invention, and the contents of the present invention should not be construed as being limited to this embodiment.

(燃焼装置の基本的構成)
図1は、本発明のシラン含有ガス又はシラン含有廃液の燃焼方法に使用する燃焼装置の実施形態例を示すものである。
燃焼炉1は、縦型円筒状炉体5を有し、その頂部中央には燃焼バーナー(たとえばボルテックスバーナー)2が設けられていて、この燃焼バーナー2からはLPG、天然ガス、重油等の燃料Fが燃焼用空気(図示せず)によって下向きに燃焼炉1内に噴射されて燃焼させられるとともに、この燃焼バーナー2の周りの燃焼炉1の肩部には、処理要素(シラン含有ガス又はシラン含有廃液)Gを燃焼炉1内に噴霧する複数の吹出しノズル3が周方向に等間隔に、かつ円筒状をなす燃焼炉1の中心線に向けて斜め下向きに設けられている。
(Basic structure of combustion equipment)
FIG. 1 shows an embodiment of a combustion apparatus used in the combustion method of the silane-containing gas or silane-containing waste liquid of the present invention.
The combustion furnace 1 has a vertical cylindrical furnace body 5, and a combustion burner (for example, a vortex burner) 2 is provided at the center of the top, and fuel such as LPG, natural gas, heavy oil, etc. is provided from the combustion burner 2. F is injected into the combustion furnace 1 downward by combustion air (not shown) and burned, and a processing element (silane-containing gas or silane) is placed on the shoulder of the combustion furnace 1 around the combustion burner 2. A plurality of blowing nozzles 3 for spraying the contained waste liquid (G) into the combustion furnace 1 are provided at equal intervals in the circumferential direction and obliquely downward toward the center line of the cylindrical combustion furnace 1.

図2に参照されるように、これらのノズル3から燃焼炉1内に噴霧されたシラン含有ガス又はシラン含有廃液Gが、望ましくは、上記燃焼バーナー2の燃料Fの燃焼の火炎の下端より下方に向けて吹き込まれる。また、燃焼炉1の炉壁5には、炉内温度検出器が設置される。炉内温度検出器は、燃焼炉の内部温度を検出し、その検出結果を制御部(図示せず)に伝送可能であることが好ましく、設置高さの異なる複数の炉内温度検出器を設置することが好ましい。制御部は、検出結果に基づいて、燃焼バーナーへ燃料供給量、燃焼空気量、ノズル3への燃焼空気供給量、不活性ガス供給量、シラン含有ガス又はシラン含有廃液の供給量の少なくとも一つを調整する機能を備える。ここで燃料供給量、燃焼空気量、ノズル3への燃焼空気供給量、不活性ガス供給量の調整は、各流体の配管やダクトに設けたバルブ、ダンパ等の流量調整手段を用いたり、各流体を供給するポンプやブロワから供給量を変更することで行うことができる。 本実施例では炉内温度検出器として、燃焼バーナー2による火炎Bの中心線C2と、吹出しノズル3の各流路からの各要素の指向線C3との交点Xより下方位置に設けた上部温度検出器Sdと、前記上部温度検出器Sdより下方位置に設けた炉内下部温度検出器Suを備えた。
他の実施形態として炉内下部温度検出器Suのみを備えるものでも良い。
As shown in FIG. 2, the silane-containing gas or the silane-containing waste liquid G sprayed into the combustion furnace 1 from these nozzles 3 is preferably below the lower end of the combustion flame of the fuel F of the combustion burner 2. It is blown toward. A furnace temperature detector is installed on the furnace wall 5 of the combustion furnace 1. The in-furnace temperature detector is preferably capable of detecting the internal temperature of the combustion furnace and transmitting the detection result to a control unit (not shown), and installing a plurality of in-furnace temperature detectors having different installation heights. It is preferable to do. Based on the detection result, the control unit at least one of a fuel supply amount to the combustion burner, a combustion air amount, a combustion air supply amount to the nozzle 3, an inert gas supply amount, a silane-containing gas or a silane-containing waste liquid supply amount It has a function to adjust. Here, adjustment of the fuel supply amount, the combustion air amount, the combustion air supply amount to the nozzle 3 and the inert gas supply amount may be performed by using flow rate adjusting means such as valves and dampers provided in pipes and ducts of each fluid, This can be done by changing the supply amount from a pump or blower that supplies fluid. In this embodiment, as an in-furnace temperature detector, the upper temperature provided at a position below the intersection X between the center line C2 of the flame B by the combustion burner 2 and the directional line C3 of each element from each flow path of the blowout nozzle 3. A detector Sd and an in-furnace lower temperature detector Su provided at a position below the upper temperature detector Sd were provided.
As another embodiment, only the lower furnace temperature detector Su may be provided.

また、この燃焼によって生じた燃焼排ガスは、燃焼炉1の下部の出口からガス冷却器4に供給され、この燃焼排ガスに空気を供給して冷却が行われる。その後、ガス冷却器4からバグフィルタ−、除害塔などの装置へ供給され適宜の処理を受ける。   The combustion exhaust gas generated by this combustion is supplied to the gas cooler 4 from the lower outlet of the combustion furnace 1, and air is supplied to the combustion exhaust gas for cooling. Thereafter, the gas cooler 4 is supplied to a device such as a bag filter or a detoxification tower and subjected to appropriate processing.

図3において、吹出しノズル3は、多重管構造を有し、その中心側から外方側に向けて、シラン含有ガス又はシラン含有廃液Gの流路、不活性ガス流路、燃焼空気流路とされ、シラン含有ガス又はシラン含有廃液の流路の出口Egに対して、不活性ガス流路の出口Eiが同一か前方に位置しており、並びに前記不活性ガス流路の出口Eiに対して、燃焼空気流路の出口Ecが後方に位置している態様が好適である。
なお、多重管構造であるのが、環状筒状のフローを形成するために好適であるが、特に、不活性ガス流路、燃焼空気流路については、環状位置において軸線方向に沿って多数の細管を配置したものでもよい。
In FIG. 3, the blowing nozzle 3 has a multi-tube structure, and from the center side toward the outer side, a flow path of silane-containing gas or silane-containing waste liquid G, an inert gas flow path, a combustion air flow path, The outlet Ei of the inert gas flow path is the same as or forward of the outlet Eg of the flow path of the silane-containing gas or the silane-containing waste liquid, and the outlet Ei of the inert gas flow path A mode in which the outlet Ec of the combustion air flow path is located rearward is preferable.
The multi-tube structure is suitable for forming an annular cylindrical flow, but in particular, with regard to the inert gas flow path and the combustion air flow path, a large number of them along the axial direction at the annular position. A thin tube may be arranged.

運転方法の一例として、上部温度検出器Sdで検出される炉内上部温度に対して、炉内下部温度検出器Suで検出される炉内下部温度が高くなる、若しくは、炉内上部温度が二酸化珪素(SiO2)が溶融または焼結する温度以下となるよう、ノズル3への燃焼空気供給量または不活性ガスの供給量のうち少なくとも一方を調整する方法がある。
不活性ガス(窒素、アルゴンなど)の供給量は、不活性ガス流路の出口Eiでの流速が、2〜10m/sec、またはシラン含有ガス又はシラン含有廃液Gの1kgに対して0.3〜6.0Nm3の範囲(すなわち0.3〜6.0Nm3/kg)が望ましい。このように不活性ガスの供給量を所定の範囲とすることで、吹出しノズル3の出口近傍においてシラン含有ガス又はシラン含有廃液と燃焼空気が混合することを防止するとともに、シラン含有廃液と燃焼空気とが混合した場合であっても吹出しノズル3に二酸化珪素が付着することを防止することが可能となる。更に上記記載の供給量を採用することで、不活性ガスがシラン含有ガス又はシラン含有廃液の燃焼遅延要因の一つとなり、燃焼炉上方におけるシラン含有ガス又はシラン含有廃液の燃焼を抑制することになる。
As an example of the operation method, the furnace lower temperature detected by the furnace lower temperature detector Su is higher than the furnace upper temperature detected by the upper temperature detector Sd, or the furnace upper temperature is dioxide dioxide. There is a method of adjusting at least one of the supply amount of combustion air and the supply amount of inert gas to the nozzle 3 so that the temperature is lower than the temperature at which silicon (SiO 2 ) is melted or sintered.
The supply amount of the inert gas (nitrogen, argon, etc.) is such that the flow rate at the outlet Ei of the inert gas flow path is 2 to 10 m / sec, or 0.3 kg relative to 1 kg of the silane-containing gas or the silane-containing waste liquid G. A range of ˜6.0 Nm 3 (ie, 0.3 to 6.0 Nm 3 / kg) is desirable. Thus, by making the supply amount of the inert gas within a predetermined range, the silane-containing gas or the silane-containing waste liquid and the combustion air are prevented from being mixed in the vicinity of the outlet of the blowout nozzle 3, and the silane-containing waste liquid and the combustion air are mixed. It is possible to prevent silicon dioxide from adhering to the blowout nozzle 3 even when these are mixed. Furthermore, by adopting the supply amount described above, the inert gas becomes one of the combustion delay factors of the silane-containing gas or silane-containing waste liquid, and the combustion of the silane-containing gas or silane-containing waste liquid above the combustion furnace is suppressed. Become.

炉内下部温度器Suが示す炉内下部温度は1000℃未満、850℃以上とする、より望ましくは950℃〜900℃とするのが望ましい。
1000℃以上であると、二酸化珪素の焼結又は溶融を生じ、上述の閉塞などを招く。850℃未満であると、未燃成分が生じる可能性がある。
The in-furnace lower temperature indicated by the in-furnace lower temperature unit Su is less than 1000 ° C. and not less than 850 ° C., more desirably 950 ° C. to 900 ° C.
When it is 1000 ° C. or higher, silicon dioxide is sintered or melted, and the above-described blockage is caused. If it is lower than 850 ° C., an unburned component may be generated.

ところで、燃焼バーナーとしては、短焔のものと長焔のものとがあるが、短焔燃焼バーナー、たとえばボルテックスバーナーを使用するのが、炉体の高さを短くできるなどの利点があり望ましい。
このボルテックスバーナーによる火炎Bの長さLは、燃焼バーナーの径Dに対して実質的に約1.5Dの関係にある。このことを基準に、交点Xを定めることができる。
By the way, there are short burners and long burners as combustion burners, but it is desirable to use a short burner, for example, a vortex burner, because there is an advantage that the height of the furnace body can be shortened.
The length L of the flame B by this vortex burner is substantially in a relationship of about 1.5D with respect to the diameter D of the combustion burner. Based on this, the intersection point X can be determined.

吹出しノズル3の設置角度θは、0度を越えて傾斜するのが望ましく、特に設置角度θは20度〜70度が望ましい。   The installation angle θ of the blow-out nozzle 3 is desirably inclined beyond 0 degree, and in particular, the installation angle θ is preferably 20 degrees to 70 degrees.

次に実施例及び比較例を示す。
実施例1及び実施例2は、図2及び図3に示す装置によるものである。
比較例1及び比較例2は、実施例1及び実施例2に対して、その不活性ガス流路に空気を流した空気を流した例である。結果を表1に示す。
Next, examples and comparative examples are shown.
Example 1 and Example 2 are based on the apparatus shown in FIG.2 and FIG.3.
Comparative Example 1 and Comparative Example 2 are examples in which air that flows air through the inert gas flow channel is flowed with respect to Example 1 and Example 2. The results are shown in Table 1.

Figure 2017040429
Figure 2017040429

実施例1では、燃焼バ−ナ−にLPGを0.37Nm3/h、その燃焼空気として10Nm3/h供給した。吹き出しノズル中心からシラン含有ガス(高位発熱量として約23,860kJ/kg)を2.4kg/h、中心より外方側に窒素を2.6Nm3/h、その外方側へ炉内下部温度が約950℃となるように空気を供給した。その結果、炉内上部温度は炉内下部温度より低い933℃の結果となった。この時、COは0ppmでありこの燃焼温度で完全燃焼できていることが判った。比較例1は実施例1の吹き出しノズルへ供給している窒素を空気に置き換えた場合の例であり980〜1030℃の結果となり窒素による燃焼遅延効果があることが判った。 In Example 1, the combustion Ba - Na - the LPG to 0.37 nm 3 / h, and 10 Nm 3 / h supplied as the combustion air. Silane-containing gas (about 23,860 kJ / kg as the higher heating value) from the center of the blowing nozzle is 2.4 kg / h, nitrogen is 2.6 Nm 3 / h outward from the center, and the furnace lower temperature is outward Was supplied so that the air temperature was about 950 ° C. As a result, the upper temperature in the furnace was 933 ° C., which was lower than the lower temperature in the furnace. At this time, CO was 0 ppm, and it was found that complete combustion was possible at this combustion temperature. Comparative Example 1 is an example in which the nitrogen supplied to the blowing nozzle of Example 1 was replaced with air, and the results were 980 to 1030 ° C., and it was found that there was a combustion delay effect due to nitrogen.

次に実施例2では、燃焼バ−ナ−にLPGを0.4Nm3/h、その燃焼空気として10Nm3/h供給した。吹き出しノズル中心からシラン含有ガス(高位発熱量として約22,200kJ/kg)を2.86kg/h、中心より外方側に窒素を2.6Nm3/h、その外方側へ炉内下部温度が約910℃となるように空気を供給した。その結果、炉内上部温度は炉内下部温度より低い878℃の結果となった。この時、COは0ppmでありこの燃焼温度でも完全燃焼できていることが判った。比較例2は実施例2の吹き出しノズルへ供給している窒素を空気に置き換えた場合の例であり930〜980℃の結果となり窒素による燃焼遅延効果があることが判った。 In following examples 2, combustion Ba - Na - the LPG to 0.4 Nm 3 / h, and 10 Nm 3 / h supplied as the combustion air. 2.86 kg / h of silane-containing gas (about 22,200 kJ / kg as the higher heating value) from the center of the blowing nozzle, 2.6 Nm 3 / h of nitrogen outward from the center, and lower temperature in the furnace to the outer side Was supplied so that the air temperature was about 910 ° C. As a result, the upper temperature in the furnace was 878 ° C., which was lower than the lower temperature in the furnace. At this time, CO was 0 ppm, and it was found that complete combustion was possible even at this combustion temperature. Comparative Example 2 is an example in which the nitrogen supplied to the blowing nozzle of Example 2 was replaced with air, and the result was 930 to 980 ° C., and it was found that there was a combustion delay effect due to nitrogen.

また参考例1、2では、シランを燃焼バ−ナ−と吹き出しノズルへ同時に供給した参考デ−タであるが、参考例1は炉内下部温度が845℃ではCOが5ppm、参考例2はCOが1ppm程度で微量ではあるが発生した。850℃以下ではさらにCOが発生することが予想され、完全燃焼の観点から炉内下部温度は850℃〜900℃以上が望ましいことが判った。 Reference examples 1 and 2 are reference data in which silane is simultaneously supplied to a combustion burner and a blow-off nozzle. Reference example 1 is a furnace lower temperature of 845 ° C., CO is 5 ppm, and reference example 2 is CO was generated at a level of about 1 ppm, but a small amount. It was predicted that CO would be further generated at 850 ° C. or lower, and that the lower temperature in the furnace was desirably 850 ° C. to 900 ° C. or higher from the viewpoint of complete combustion.

1…燃焼炉、2…バーナー、3…吹出しノズル、4…ガス冷却器、5…炉体、G…シラン含有ガス又はシラン含有廃液、11…不活性ガス、12…燃焼空気、Su…上部温度検出器、Sd…上部温度検出器。 DESCRIPTION OF SYMBOLS 1 ... Combustion furnace, 2 ... Burner, 3 ... Blowing nozzle, 4 ... Gas cooler, 5 ... Furnace body, G ... Silane containing gas or silane containing waste liquid, 11 ... Inert gas, 12 ... Combustion air, Su ... Upper temperature Detector, Sd ... Upper temperature detector.

Claims (9)

シラン含有ガス又はシラン含有廃液を燃焼炉に供給して燃焼する方法において、
燃焼炉の上部に、下向きに燃料と燃焼空気による燃焼バーナーを設け、
それより下方の位置に吹出しノズルを設け、このノズルは、その中心側から外方側に向けて、シラン含有ガス又はシラン含有廃液の流路、不活性ガス流路、燃焼空気流路を有しており、
前記燃焼バーナーによって生成される火炎の下端より下方位置に、前記吹出しノズルの各流路から各流体を吹出す、
ことを特徴とするシラン含有ガス又はシラン含有廃液の燃焼方法。
In a method of supplying silane-containing gas or silane-containing waste liquid to a combustion furnace and burning it,
At the top of the combustion furnace, a combustion burner with fuel and combustion air is installed downward,
A blowing nozzle is provided at a position below it, and this nozzle has a flow path of silane-containing gas or silane-containing waste liquid, an inert gas flow path, and a combustion air flow path from the center side to the outer side. And
Each fluid is blown out from each flow path of the blowing nozzle to a position below the lower end of the flame generated by the combustion burner,
A combustion method of a silane-containing gas or a silane-containing waste liquid.
前記不活性ガス流路の出口での不活性ガスの流速を2〜10m/sec、またはシラン含有ガス又はシラン含有廃液1kgに対して0.3〜6.0Nm3の範囲とする請求項1記載のシラン含有ガス又はシラン含有廃液の燃焼方法。 The flow rate of the inert gas at the outlet of the inert gas flow path is set to 2 to 10 m / sec, or 0.3 to 6.0 Nm 3 with respect to 1 kg of the silane-containing gas or the silane-containing waste liquid. Of burning silane-containing gas or silane-containing waste liquid. 前記燃焼バーナーによって生成される火炎の中心線と、前記吹出しノズルの吹出し指向線との交点より下方に位置し、燃焼炉の垂直方向に異なる2点のうち、上方位置の炉内上部温度に対して下方位置において前記炉内上部温度より高い燃焼温度または炉内上部温度が二酸化珪素(SiO2)が溶融または焼結する温度以下でシラン含有ガス又はシラン含有廃液を燃焼処理することを特徴とする請求項1または2記載のシラン含有廃液の燃焼方法。 Of the two points that are located below the intersection of the flame center line generated by the combustion burner and the blowing directional line of the blowing nozzle and differ in the vertical direction of the combustion furnace, The silane-containing gas or the silane-containing waste liquid is combusted at a lower position at a combustion temperature higher than the furnace upper temperature or a temperature at which the furnace upper temperature is not higher than a temperature at which silicon dioxide (SiO 2 ) melts or sinters. The combustion method of the silane containing waste liquid of Claim 1 or 2. 前記上方位置に設けた上部温度検出器による炉内上部温度に対して、前記下方位置に設けた炉内下部温度検出器による炉内下部温度が高くなる操作を行う請求項1記載のシラン含有ガス又はシラン含有廃液の燃焼方法。   2. The silane-containing gas according to claim 1, wherein an operation for increasing a lower temperature in the furnace by a lower temperature detector in the lower position is performed with respect to an upper temperature in the upper temperature detector provided in the upper position. Or the combustion method of a waste liquid containing silane. 上記操作が、吹き出しノズルから供給される不活性ガス、燃焼空気、シラン含有ガス又はシラン含有廃液の各供給量のうち少なくとも1つを調整する操作であることを特徴とする請求項4記載のシラン含有ガス又はシラン含有廃液の燃焼方法。   5. The silane according to claim 4, wherein the operation is an operation of adjusting at least one of the supply amounts of inert gas, combustion air, silane-containing gas, or silane-containing waste liquid supplied from a blowing nozzle. Combustion method of contained gas or silane-containing waste liquid. 炉内下部温度を1000℃未満、850℃以上とする請求項1又は請求項3記載のシラン含有ガス又はシラン含有廃液の燃焼方法。   The combustion method of a silane-containing gas or a silane-containing waste liquid according to claim 1 or 3, wherein the temperature in the lower part of the furnace is lower than 1000 ° C and 850 ° C or higher. 前記シラン含有ガス又はシラン含有廃液の高位発熱量が0kJ/kg以上46,000kJ/kg以下であって、前記炉内下方温度が850℃以上、1000℃未満となるよう、吹き出しノズルから供給される不活性ガス、燃焼空気、シラン含有ガス又はシラン含有廃液の各供給量のうち少なくとも1つを制御することを特徴とする請求項6記載のシラン含有ガス又はシラン含有廃液の燃焼方法。   The high heat generation amount of the silane-containing gas or silane-containing waste liquid is 0 kJ / kg or more and 46,000 kJ / kg or less, and the lower temperature in the furnace is supplied from the blowing nozzle so as to be 850 ° C. or more and less than 1000 ° C. 7. The method for combusting a silane-containing gas or silane-containing waste liquid according to claim 6, wherein at least one of the supply amounts of inert gas, combustion air, silane-containing gas or silane-containing waste liquid is controlled. シラン含有ガス又はシラン含有廃液を燃焼炉に供給して燃焼する装置であって、
燃焼炉と、この燃焼炉の上部に、下向きに設けられた燃料と燃焼空気による燃焼バーナーと、燃焼バーナーの下方に設けられた吹出しノズルとを含み、
前記吹出しノズルは、その中心側から外方側に向けて、シラン含有ガス又はシラン含有廃液の流路、不活性ガス流路、燃焼空気流路を有している、
ことを特徴とするシラン含有ガス又はシラン含有廃液の燃焼装置。
A device for supplying a silane-containing gas or a silane-containing waste liquid to a combustion furnace and burning it,
Including a combustion furnace, a combustion burner with fuel and combustion air provided downward in the upper part of the combustion furnace, and a blowout nozzle provided below the combustion burner,
The blowing nozzle has a flow path of silane-containing gas or silane-containing waste liquid, an inert gas flow path, and a combustion air flow path from the center side to the outer side.
A combustion apparatus for silane-containing gas or silane-containing waste liquid.
前記吹出しノズルは多重管構造を有し、その中心側から外方側に向けて、シラン含有ガス又はシラン含有廃液の流路、不活性ガス流路、燃焼空気流路とされ、
シラン含有ガス又はシラン含有廃液の流路の出口に対して、不活性ガス流路の出口が同一か前方に位置しており、並びに前記不活性ガス流路の出口に対して、燃焼空気流路の出口が後方に位置している請求項8記載のシラン含有ガス又はシラン含有廃液の燃焼装置。
The blowing nozzle has a multi-tube structure, and from the center side toward the outer side, a flow path of silane-containing gas or silane-containing waste liquid, an inert gas flow path, a combustion air flow path,
The outlet of the inert gas flow path is the same as or forward of the outlet of the flow path of the silane-containing gas or the silane-containing waste liquid, and the combustion air flow path with respect to the outlet of the inert gas flow path The silane-containing gas or silane-containing waste liquid combustion apparatus according to claim 8, wherein the outlet of the silane is located rearward.
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