JP3478468B2 - Method and apparatus for producing inorganic spherical particles - Google Patents
Method and apparatus for producing inorganic spherical particlesInfo
- Publication number
- JP3478468B2 JP3478468B2 JP22800397A JP22800397A JP3478468B2 JP 3478468 B2 JP3478468 B2 JP 3478468B2 JP 22800397 A JP22800397 A JP 22800397A JP 22800397 A JP22800397 A JP 22800397A JP 3478468 B2 JP3478468 B2 JP 3478468B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- cooling zone
- gas
- temperature
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/10—Forming beads
- C03B19/1005—Forming solid beads
- C03B19/102—Forming solid beads by blowing a gas onto a stream of molten glass or onto particulate materials, e.g. pulverising
- C03B19/1025—Bead furnaces or burners
Description
【０００１】[0001]
【発明の属する技術分野】本発明は無機質原料粉末を高
温火炎中に投入して、球状粒子を製造する方法及び装置
に関するものである。更に詳しく云えば、半導体等の封
止材に用いる樹脂組成物の充填材に好適な球状粒子を製
造するに際し、溶融球状化後の冷却に関するものであ
る。TECHNICAL FIELD The present invention relates to a method and an apparatus for producing spherical particles by introducing an inorganic raw material powder into a high temperature flame. More specifically, it relates to cooling after melting and spheroidizing in producing spherical particles suitable for a filler of a resin composition used for a sealing material such as a semiconductor.
【０００２】[0002]
【従来の技術】樹脂充填材に用いる無機質粉末は、従来
ブロック状のインゴットを粉砕して製造されてきた。そ
の為個々の粒子の形状は角張った不定形であった。しか
し半導体素子の高性能化に伴い封止用の樹脂組成物も高
流動性と共に、充填材の高充填化が要求され、これを解
決する手段として充填材の球状化技術が開発された。2. Description of the Related Art Inorganic powders used for resin fillers have hitherto been manufactured by crushing block-shaped ingots. Therefore, the shape of each particle was angular and irregular. However, as the performance of semiconductor devices has increased, resin compositions for encapsulation are required to have high fluidity as well as to be highly filled with a filler, and a spheroidizing technique for the filler has been developed as a means for solving this.
【０００３】無機質粉末の球状化技術としては、例えば
金属微粒子を火炎中に投じて酸化反応させながら球状粒
子を製造する方法、金属アルコラートを特定の条件でゾ
ルゲル法により析出させ球状化する方法、あるいは不定
形の粒子を粉砕機中で粒子の角を徐々に取り、疑似球状
化する方法が提案あるいは実用化されている。本発明は
無機質原料粉末を高温火炎中に投じて、基本的に化学組
成を変えることなく溶融又は軟化により球状化する方法
に関するものである。本方法は粒径の大きい粒子から、
小さな粒子まで幅広く、連続して球状化可能であり、製
造に適した方法といえる。しかし球状化過程において、
炉壁への粒子の付着が進行すると、炉壁からの冷却能力
が低下して系内温度上昇を招くか、または付着粒子の焼
結、凝固が進行しそれらが剥がれ落ちて焼結状塊状物に
よる凝集粉混入、炉内閉塞、粒子輸送経路の閉塞を招く
という問題があった。また、炉壁への粒子付着が全く行
われない場合は、長時間の高温雰囲気により炉内壁が劣
化し、炉内壁耐火物、金属酸化物により異物が混入する
という問題があった。このような問題に対して、例えば
特開昭61-118131号では、燃焼炉下部へ圧縮気体を送り
燃焼炉下部を急冷する事により、溶融粒子の冷却固結反
応を促進させて粒子の融着を防止する方法が提案されて
いる。また、特開昭62-241542号のように、球状化室の
炉壁温度を600〜1100℃に保つ事により球状化室の付着
層を一定に保つ方法も提案されている。The spheroidizing technique of the inorganic powder includes, for example, a method of producing spherical particles by injecting fine metal particles into a flame to cause an oxidation reaction, a method of precipitating and spheroidizing a metal alcoholate by a sol-gel method under specific conditions, or A method has been proposed or put into practical use in which irregularly shaped particles are gradually rounded in a crusher so as to be pseudospherical. The present invention relates to a method of throwing an inorganic raw material powder into a high temperature flame to make it spherical by melting or softening basically without changing the chemical composition. This method starts with large particles
It can be said to be a method suitable for manufacturing, as it can continuously form spheres up to a wide range of small particles. But in the spheronization process,
If particles adhere to the furnace wall, the cooling capacity from the furnace wall decreases and the temperature inside the system rises, or sintering and solidification of the adhered particles progresses and they fall off, resulting in a sintered mass. However, there is a problem in that agglomerated powder is mixed due to the above, the inside of the furnace is blocked, and the particle transportation path is blocked. Further, when particles are not attached to the furnace wall at all, there is a problem that the furnace inner wall is deteriorated by a high temperature atmosphere for a long time, and foreign matter is mixed with the furnace inner wall refractory and metal oxide. To solve such a problem, for example, in JP-A-61-118131, by sending a compressed gas to the lower part of the combustion furnace to rapidly cool the lower part of the combustion furnace, the cooling and solidification reaction of the molten particles is promoted, and the particles are fused. A method of preventing this has been proposed. Further, as in JP-A-62-241542, a method of keeping the adhesion layer in the spheroidizing chamber constant by keeping the furnace wall temperature in the sphering chamber at 600 to 1100 ° C has also been proposed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら特開昭61
-11831号では、冷却効果のない炉上部にて炉付着物の増
大を防止できないという問題があった。また、特開昭62
-241542号では、燃料燃焼による発熱量と炉の放熱量の
バランスで内壁温度を設定するのみであって適正な炉の
形状は与えられておらず、また同一の球状化炉を用いて
様々な条件にて燃焼する場合に炉壁温度を制御し炉壁へ
の付着増大または減少を防止する事は出来なかった。[Patent Document 1] Japanese Patent Application Laid-open No. Sho 61
-11831 has a problem that it is not possible to prevent the increase of deposits on the furnace at the upper part of the furnace which has no cooling effect. In addition, JP-A-62
-241542 only sets the inner wall temperature by balancing the amount of heat generated by fuel combustion and the amount of heat released by the furnace, and does not give the proper shape of the furnace. When burning under the conditions, it was not possible to control the furnace wall temperature and prevent the increase or decrease of adhesion to the furnace wall.
【０００５】燃焼炉の温度を管理する技術としては特開
平2-199013号のように、燃焼火炎領域に冷却ガスを導入
する方法がとられているが、炉内壁への粒子の付着を制
御するのは困難であった。As a technique for controlling the temperature of the combustion furnace, a method of introducing a cooling gas into the combustion flame region is used as in Japanese Patent Laid-Open No. 2-199013, but the adhesion of particles to the inner wall of the furnace is controlled. It was difficult.
【０００６】[0006]
【課題を達成するための手段】本発明は上記状況に鑑み
てなされたもので、無機質粉末粒子を高温火炎中に投じ
て、粒子を球状化する製造方法に於いて、冷却中に生じ
る壁への付着量を制御する事により、凝集の少ない球状
粒子を長期間安定して製造することを目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a manufacturing method for throwing inorganic powder particles into a high temperature flame to make the particles spherical, a wall formed during cooling is The purpose is to stably produce spherical particles with less aggregation for a long period of time by controlling the adhesion amount of
【０００７】球状化後の冷却を効果的に行うため、金属
製の冷却塔内で冷却帯の大きさ、ガス量、温度分布の関
係を調べた結果、ガス流量を特定の空塔速度にすること
により、また冷却帯のＬ／Ｄの値を特定の範囲にするこ
とにより凝集、壁付着の少ない製造を安定的に出来るこ
とを見いだし本発明に到達した。ここで本発明において
は、従来バーナ周囲の構築物を炉体と称していたもの
を、積極的に冷却を行うという思想のもと、構築物の内
面を金属製の冷却効果の高い構築物を用いるため、以後
冷却塔と称する。In order to effectively perform cooling after spheroidizing, the relationship between the size of the cooling zone, the amount of gas, and the temperature distribution was examined in the cooling tower made of metal, and as a result, the gas flow rate was set to a specific superficial velocity. Therefore, the inventors have found that by controlling the L / D value of the cooling zone within a specific range, it is possible to stably carry out the production with less aggregation and adhesion to the wall, and reached the present invention. Here, in the present invention, what was conventionally called the structure around the burner as the furnace body, under the idea of actively cooling, in order to use a structure with a high cooling effect made of metal for the inner surface of the structure, Hereinafter referred to as a cooling tower.
【０００８】すなわち本発明は、金属製の内壁を有する
冷却塔内に於いて、原料粉末を高温火炎中に投入して溶
融球状化し、球状粒子を含む燃焼ガスを冷却帯を通過さ
せながら冷却する無機質球状粒子の製造方法であって、
冷却帯のガスの空塔速度を0.04〜3.00ｍ／ｓｅｃとする
無機質球状粒子の製造方法である。That is, according to the present invention, in a cooling tower having an inner wall made of metal, a raw material powder is charged into a high temperature flame to melt and spheroidize, and a combustion gas containing spherical particles is cooled while passing through a cooling zone. A method for producing inorganic spherical particles,
A method for producing inorganic spherical particles, wherein the superficial velocity of gas in the cooling zone is 0.04 to 3.00 m / sec.
【０００９】又、冷却帯出口の温度を４００℃以上とす
る上記の製造方法であるFurther, it is the above manufacturing method in which the temperature of the cooling zone outlet is 400 ° C. or higher.
【００１０】さらに上記製造方法において、冷却帯の長
さＬと円相当計Ｄの比、Ｌ／Ｄが2〜5とした装置であ
る。Further, in the above manufacturing method, the ratio L / D of the length L of the cooling zone and the circle equivalent meter D, L / D, is 2 to 5.
【００１１】[0011]
【発明の実施の形態】本発明で用いる無機質原料粉末は
加熱によって溶融あるいは軟化するものであれば、特に
限定されものではないが、シリカ質原料、アルミナ、あ
るいはスピネル、ムライトのような複酸化物等の１８０
０℃以上の高温で球状化する必要のある無機質原料に適
している。特にシリカ質原料は球状化後の凝集性が強
く、本発明の方法に適した材料である。無機質原料の粒
度は、0.5〜200μ程度まで球状化可能であるが、一般に
粒度が20μ以下と微粉になるほど、冷却中の凝集、壁へ
の付着が多くなり、本発明の効果が大であるが粒度を特
に限定するものではない。BEST MODE FOR CARRYING OUT THE INVENTION The inorganic raw material powder used in the present invention is not particularly limited as long as it is melted or softened by heating, but is not limited to siliceous raw material, alumina, or complex oxides such as spinel and mullite. 180 of etc
It is suitable for inorganic raw materials that need to be spheroidized at high temperatures of 0 ° C or higher. In particular, the siliceous raw material is a material suitable for the method of the present invention because it has a strong cohesive property after spheroidization. The particle size of the inorganic raw material can be spheroidized to about 0.5 to 200μ, but generally, the finer the particle size is 20μ or less, the more agglomerated during cooling, the more adhered to the wall, the effect of the present invention is large. The particle size is not particularly limited.
【００１２】次いで球状化設備の構成を図１に基づいて
説明する。冷却塔は金属製であることが必要であり、冷
却塔内壁に熱伝導率の低い耐火材等を使用するのは冷却
効率が低下するので好ましくない。冷却塔は図１に示す
竪型方式が、冷却帯の温度制御が容易であり、好まし
い。なお、横型にして火炎を水平方向に吹き出す、いわ
ゆる横型又は傾斜型として、冷却塔を回転させながら球
状化する方法を制限するものではない。球状化粒子の
内、粒度の大きいものは沈降速度が速く、冷却塔直下に
ある１次回収口１０より回収される。微粉球状品を含む
排ガスは２次系回収装置１２への接続部９より、更に冷
却されつつ２次系回収部１２に到達し、そこで適宜配置
されたサイクロン、ルーバー、バッグフィルター等で球
状粉を排ガス中より分離回収し、タンクにて貯蔵する。
２次系回収装置１２の後部にはガス吸引装置１３が配置
され、バーナー１からの燃焼後排ガス及びバーナー近傍
に設けられた吸引口２からの冷却用空気を生成球状粒子
と共に吸引する。Next, the structure of the spheroidizing equipment will be described with reference to FIG. The cooling tower needs to be made of metal, and it is not preferable to use a refractory material having a low thermal conductivity on the inner wall of the cooling tower because the cooling efficiency is lowered. For the cooling tower, the vertical type shown in FIG. 1 is preferable because the temperature control of the cooling zone is easy. It should be noted that there is no limitation on the method of spheroidizing the cooling tower by rotating the cooling tower as a so-called horizontal type or inclined type in which the flame is horizontally blown out in the horizontal direction. Among the spheroidized particles, those having a large particle size have a high sedimentation speed and are recovered from the primary recovery port 10 immediately below the cooling tower. The exhaust gas containing fine powder spherical particles reaches the secondary system recovery section 12 while being further cooled from the connection section 9 to the secondary system recovery apparatus 12, and the cyclone, louver, bag filter and the like appropriately arranged to generate the spherical powder. Separated and collected from the exhaust gas and stored in a tank.
A gas suction device 13 is arranged at the rear of the secondary system recovery device 12, and sucks the exhaust gas after combustion from the burner 1 and the cooling air from the suction port 2 provided near the burner together with the generated spherical particles.
【００１３】火炎を生成する為の燃焼性ガスは、アセチ
レン、エチレン、プロパン、ブタン等の炭化水素系のガ
スあるいはこれらの混合ガスを適宜用いる。燃焼支燃性
ガスとしては、酸素、酸素リッチ空気、あるいは空気の
いずれでも良い。原料粉は燃焼性ガスあるいは支燃性ガ
スのいずれかあるいは両方に分散させて、バーナー口よ
りガスと共に燃焼炎中に投じ、加熱球状化する。バーナ
ーは火炎の形成が均一で安定に出来ればいずれの形式で
も良いが、一般的に３重管以上の構造となっており、水
冷式である。As the combustible gas for generating the flame, a hydrocarbon-based gas such as acetylene, ethylene, propane, butane or a mixed gas thereof is appropriately used. The combustion-supporting gas may be oxygen, oxygen-rich air, or air. The raw material powder is dispersed in either or both of the combustible gas and the combustion-supporting gas, and the powder is thrown into the combustion flame together with the gas from the burner port to be heated and spheroidized. The burner may be of any type as long as the flame can be formed uniformly and stably, but generally it has a structure of three or more tubes and is water-cooled.
【００１４】バーナー先端から燃焼性ガス或いは支燃性
ガスと共に火炎中に投入された不定形な原料粒子は、火
炎中で加熱され、表面から溶融、あるいは軟化すると同
時に表面張力により粒子の角部は丸くなり球状化する。
火炎の大きさ、火炎温度、火炎中の粒子の滞在時間は、
球状化の程度に大きく影響されるが、原料の融点、粒径
によって適宜制御する必要がある。球状化後の粒子は燃
焼後の排ガスと共に火炎より放出され、排ガスと共に冷
却帯中で冷却され、球状のまま固化する。Amorphous raw material particles introduced into the flame together with the combustible gas or the combustion supporting gas from the tip of the burner are heated in the flame and melted or softened from the surface, and at the same time, the corners of the particles are formed by surface tension. It becomes round and spherical.
The size of the flame, the flame temperature, the residence time of the particles in the flame are
Although it is greatly affected by the degree of spheroidization, it must be controlled appropriately depending on the melting point and particle size of the raw material. The spheroidized particles are emitted from the flame together with the exhaust gas after combustion, are cooled in the cooling zone together with the exhaust gas, and are solidified in the spherical shape.
【００１５】本発明で云う冷却帯とは、図１の８で示す
ようにバーナーを有する冷却塔頂上部より、１次回収の
為のコーン部の傾斜開始位置に相当する迄の冷却塔の基
本的に直胴部となっている部分を云う。この冷却帯の内
壁には、火炎より溶融された粒子が付着し易い。この付
着層が厚いと、冷却帯の冷却能力が低下する。冷却帯内
壁の付着層が厚みを増すと、冷却層の冷却能力低下及び
付着粉と火炎との距離近接化により、付着層表面の温度
が上昇する。長時間高温に置かれた付着粉は焼結、凝固
を開始する。焼結、凝固した付着層表面には凹凸があ
り、更に付着を促進させる。このように付着と焼結、凝
固を繰り返して付着層は成長を続け、冷却帯内部を閉塞
させるか、或いは、焼結、凝固した粉体の自重落下によ
り、粉体輸送経路の閉塞、粗大粒子の混入を招くように
なる。付着が少ない場合は、冷却帯内壁が直接高温に置
かれる為、長時間の操業により冷却帯内壁が劣化し、異
物を混入させる。このように、火炎溶融による球状化を
安定して操業するには、冷却塔内壁の付着層を一定範囲
内に制御する事が不可欠となってくる。本発明は冷却帯
で生じるこのような問題を解決するために、発明された
ものであって、冷却帯を流れるガスの空塔速度を0.04〜
3.00ｍ/secとすることにより、壁への付着層の厚みの制
御が可能となり、安定操業が可能となった。The cooling zone referred to in the present invention is the basic of the cooling tower from the top of the cooling tower having a burner to the cone start position of the cone for the primary recovery, as shown at 8 in FIG. It is a part that is a straight body part. Particles melted by the flame are likely to adhere to the inner wall of the cooling zone. If this adhesion layer is thick, the cooling capacity of the cooling zone is reduced. When the thickness of the adhesion layer on the inner wall of the cooling zone increases, the temperature of the adhesion layer surface rises due to the decrease in the cooling capacity of the cooling layer and the close distance between the adhesion powder and the flame. The adhered powder that has been left at a high temperature for a long time starts to sinter and solidify. The surface of the adhered layer that has been sintered and solidified has irregularities to further promote the adhesion. In this way, the adhesion layer continues to grow by repeating the adhesion, sintering, and solidification, and the inside of the cooling zone is closed, or the powder transportation path is closed and coarse particles are caused by the weight drop of the sintered and solidified powder. Will be mixed in. When the adhesion is small, the inner wall of the cooling zone is directly placed at a high temperature, so that the inner wall of the cooling zone deteriorates due to long-term operation, and foreign matter is mixed in. As described above, in order to stably operate the spheroidization due to flame melting, it is essential to control the adhesion layer on the inner wall of the cooling tower within a certain range. The present invention has been invented in order to solve such a problem that occurs in the cooling zone, and the superficial velocity of the gas flowing in the cooling zone is 0.04 to
By setting it to 3.00 m / sec, it became possible to control the thickness of the adhesion layer on the wall, and stable operation became possible.
【００１６】本発明でいう冷却帯の空塔速度とは、冷却
帯終端部分の空塔速度を云う。この空塔速度が0.04ｍ/s
ec未満であると、冷却帯開始部分（上部）と終端部分
（下部）の温度差が生じて冷却塔壁への粒子の均一な付
着層を形成する事ができない。一般に温度の高い冷却帯
開始部分の付着層は厚みがあり、温度の低い冷却帯終端
部分においては粉体の付着は少ない。一方空塔速度を3.
00ｍ/secを越えて大きくすると、付着の増大、粉体の焼
結、凝固が促進される。本発明で呈示する0.04から3.00
ｍ/secとすることにより、壁への付着を安定させること
ができ、長期安定な操業が可能となった。好ましくは１
から2.5ｍ/secである。The superficial velocity in the cooling zone referred to in the present invention means the superficial velocity at the end of the cooling zone. This superficial velocity is 0.04m / s
If it is less than ec, a temperature difference between the cooling zone start portion (upper portion) and the end portion (lower portion) occurs, and it is not possible to form a uniform adhesion layer of particles on the cooling tower wall. Generally, the adhesion layer at the beginning of the cooling zone having a high temperature is thick, and the adhesion of the powder is small at the end of the cooling zone having a low temperature. Meanwhile, the superficial velocity is 3.
When it is increased beyond 00 m / sec, adhesion is increased, powder sintering and solidification are promoted. Presented in the invention 0.04 to 3.00
By setting m / sec, it is possible to stabilize the adhesion to the wall and enable stable operation for a long period of time. Preferably 1
To 2.5 m / sec.
【００１７】ここで空塔速度とは、冷却帯終端部分を流
れるガスの速度であり、下記の式、により計算され
る。
温度補正計数＝（冷却帯終端部分温度＋273）／273・・・・
空塔速度(ｍ/sec)＝（系内ガス量(ｍ3/h)×温度補正係数）／（冷却帯口径面積
(ｍ2) ×3600(sec/h)）・・・・Here, the superficial velocity is the velocity of the gas flowing through the end portion of the cooling zone, and is calculated by the following equation. Temperature correction coefficient = (Temperature of cooling zone end part +273) / 273 ··· Superficial velocity (m / sec) = (Gas amount in system (m 3 / h) × temperature correction coefficient) / (Cooling zone aperture area ( m 2 ) × 3600 (sec / h)) ...
【００１８】冷却帯では、球状化された粒子は火炎の先
端より冷却が開始されて、冷却帯終端部において最も低
温となる。空塔速度は火炎先端部付近で最高速となり、
冷却帯終端部において最低速となる。ここで冷却帯終端
部以外の空塔速度は、ガスの冷却過程にあるので温度と
ガスの流れが安定せず、正確な値を求めることが困難で
ある。ガスが十分に冷却された後の冷却帯終端部分の空
塔速度は、信頼できる値を求める事が可能である。この
冷却帯終端部の温度は、熱電対型温度計によって測定す
るのが一般的であるが、他の温度測定方法を限定するも
のではない。系内ガス量は、温度の低い下流側、例えば
ガス排出用の吸引ブロワー出口側の風速と温度を同時に
測定して、配管径より以下の式を用いて計算する事がで
きる。In the cooling zone, the spheroidized particles start to be cooled from the tip of the flame, and have the lowest temperature at the end of the cooling zone. The superficial velocity is the highest near the flame tip,
It becomes the lowest speed at the end of the cooling zone. Here, since the superficial velocity other than the end of the cooling zone is in the process of cooling the gas, the temperature and the flow of the gas are not stable, and it is difficult to obtain an accurate value. It is possible to obtain a reliable value for the superficial velocity at the end portion of the cooling zone after the gas is sufficiently cooled. The temperature at the end of the cooling zone is generally measured by a thermocouple type thermometer, but other temperature measuring methods are not limited. The amount of gas in the system can be calculated from the pipe diameter by using the following equation, by simultaneously measuring the wind speed and the temperature on the downstream side where the temperature is low, for example, on the outlet side of the suction blower for discharging gas.
【００１９】系内ガス量(Nｍ3/h) ＝（下流側の風速
（ｍ/sec）×測定部配管口径面積（ｍ2）×273）／（下
流側の温度（℃）＋273）
系内ガス量を算出する為の風速、温度を測定するには、
風速計＋温度計兼用式測定装置が好ましい。また、燃焼
生成ガスに水蒸気が含まれる場合は、少なくとも100℃
以上の部位で測定する事が望ましい。In-system gas amount (Nm 3 / h) = (downstream wind velocity (m / sec) x measuring section piping aperture area (m 2 ) x 273) / (downstream temperature (° C) + 273) system To measure the wind speed and temperature to calculate the gas amount,
An anemometer + thermometer combined measuring device is preferred. Also, if the combustion product gas contains water vapor, at least 100 ° C
It is desirable to measure at the above sites.
【００２０】また、吸引空気量については、系内ガス量
と燃焼生成ガス量との差で示される。
吸引空気量（Nｍ3/H）＝ 系内ガス量（Nｍ3/h）− 燃
焼生成ガス量（Nｍ3/h）
また燃焼生成ガス量は、例えばプロパンと酸素の完全燃
焼反応の場合、酸素過剰で実施される場合が多いので、
理論燃焼による排ガス量と過剰酸素量により求める事が
できる。空塔速度の制御は、燃焼ガス量、酸素量の制御
及び２次系回収装置の後端部に配置されたガス吸引装置
のブロアーの回転数または出口弁の開度を制御すること
により行う。The intake air amount is indicated by the difference between the system gas amount and the combustion product gas amount. Intake air amount (Nm 3 / H) = system gas amount (Nm 3 / h) -combustion product gas amount (Nm 3 / h) Further, the combustion product gas amount is oxygen in the case of a complete combustion reaction of propane and oxygen, for example. Since it is often done in excess,
It can be calculated from the exhaust gas amount and the excess oxygen amount by theoretical combustion. The superficial velocity is controlled by controlling the amount of combustion gas and the amount of oxygen, and controlling the rotational speed of the blower or the opening of the outlet valve of the gas suction device arranged at the rear end of the secondary recovery device.
【００２１】また、この時冷却帯終端部のガス温度は、
少なくとも400℃以上にすることが好ましい。冷却帯終
端部の内部温度は冷却帯下部の円相当径方向の中央部に
挿入された熱電対によって測温される値であるが、冷却
帯出口の温度は燃焼性ガスと吸引口より吸引される冷却
用ガスとの比、燃焼ガス量とガス吸引装置の吸引力によ
って制御する事が出来る。At this time, the gas temperature at the end of the cooling zone is
It is preferably at least 400 ° C or higher. The internal temperature at the end of the cooling zone is a value measured by a thermocouple inserted in the center of the lower portion of the cooling zone in the radial direction of the circle, but the temperature at the outlet of the cooling zone is sucked from the combustible gas and the suction port. It can be controlled by the ratio with the cooling gas, the amount of combustion gas, and the suction force of the gas suction device.
【００２２】以上のように空塔速度と冷却帯終端部温度
を同時に適正に保つためには燃焼性ガスと冷却用ガスと
のバランスだけでなく、冷却帯の形状が重要となる。す
なわち、水冷壁を有する冷却帯であって、冷却帯の長さ
Ｌと円相当径Ｄの比、Ｌ／Ｄが2〜5とするのが肝要であ
る。Ｌ／Ｄが２未満では、冷却効果が少なく、冷却帯の
出口温度が上昇し出口部分での粒子の凝集が顕著とな
る。またＬ／Ｄを５を越えて大きくすると最高温度と最
低温度の差が大きくなって均一な付着を形成する事が困
難となり、高温部で粒子を凝集させるか、或いは低温部
での付着が全く進行しなくなる。好ましくは3〜4であ
る。As described above, not only the balance between the combustible gas and the cooling gas but also the shape of the cooling zone is important for maintaining the superficial velocity and the temperature at the end of the cooling zone at the same time. That is, in a cooling zone having a water cooling wall, it is important that the ratio of the length L of the cooling zone to the equivalent circle diameter D, L / D, is 2 to 5. When L / D is less than 2, the cooling effect is small, the outlet temperature of the cooling zone rises, and the aggregation of particles becomes remarkable at the outlet portion. Further, if L / D is increased beyond 5, the difference between the maximum temperature and the minimum temperature becomes large, making it difficult to form uniform adhesion, and the particles are agglomerated in the high temperature part, or the adhesion in the low temperature part is completely eliminated. It will not progress. It is preferably 3 to 4.
【００２３】[0023]
実施例１
図１に示すように、球状化バ−ナ−１と冷却ガス（空
気）吸引口２を有する直胴型で竪型の冷却塔において、
冷却塔壁７の外側に冷却塔外壁５を設け、冷却塔を２重
管構造とした。冷却塔外壁５には、冷却水入口３と冷却
水出口４を設けた。冷却帯水冷部分６の最も下方の位置
（冷却体終端部）で、冷却塔径中心の測温装置１６を設
けた。冷却塔下部には球状化された粒子を１次回収する
為の回収口１０と２次捕集装置への排気連絡口９を配置
し、２次捕集装置としてのバグフィルター１２にて粒子
の２次捕集を行い、回収口１１より回収できるようにし
た。さらに燃焼排ガス及び空気の吸引装置として吸引ブ
ロワ−１３を設置し、ガス排出口１５の部分より放出さ
れる排ガス量を制御できるようにコントロール用バルブ
１４を設けた。Example 1 As shown in FIG. 1, in a straight body type vertical cooling tower having a spheroidizing burner-1 and a cooling gas (air) suction port 2,
The cooling tower outer wall 5 was provided outside the cooling tower wall 7, and the cooling tower had a double pipe structure. A cooling water inlet 3 and a cooling water outlet 4 were provided on the outer wall 5 of the cooling tower. A temperature measuring device 16 centered on the diameter of the cooling tower was provided at the lowermost position (cooling body end portion) of the cooling zone water cooling part 6. A recovery port 10 for primary recovery of spheroidized particles and an exhaust communication port 9 to a secondary collection device are arranged in the lower part of the cooling tower, and a bag filter 12 as a secondary collection device collects the particles. Secondary collection was performed so that it could be collected from the collection port 11. Further, a suction blower 13 was installed as a device for sucking combustion exhaust gas and air, and a control valve 14 was provided so as to control the amount of exhaust gas discharged from the gas outlet 15.
【００２４】冷却塔の内壁はＳＵＳ３１６材とし、塔内
径1.0ｍ、冷却帯長さ3.0ｍのものを設置した。球状化バ
ーナーより平均粒径5μｍの結晶性シリカ粉末10kg/Hrを
酸素ガスに同伴させて供給し、プロパンガス3Nｍ3/hと
酸素15Nｍ3/hで燃焼させて球状化を行った。吸引ブロワ
−出口のコントロール用バルブの開度を調節し、吸引空
気量の調節を行い、空塔速度が0.05ｍ/secとなるように
して操業を行った。この時の冷却帯終端部温度は421℃
を示した。操業開始から1日後、3日後、７日後に、球状
化処理を一旦停止し、炉の上部から下部にかけての内壁
付着物の性状及び内壁材であるＳＵＳ板の表面を調べた
所、いづれの日数においても、冷却帯の上部、中央部、
下部で付着物は粉状であり、厚みは1〜5cｍであった。
またＳＵＳ板に腐食はみられなかった。引き続き操業可
能であるのを確認した。The inner wall of the cooling tower was made of SUS316 material, and the inner diameter of the tower was 1.0 m and the cooling zone length was 3.0 m. 10 kg / Hr of crystalline silica powder having an average particle size of 5 μm was supplied together with oxygen gas from a spheroidizing burner, and spheroidized by burning with 3 Nm 3 / h of propane gas and 15 Nm 3 / h of oxygen. The opening of the control valve at the outlet of the suction blower was adjusted, the amount of sucked air was adjusted, and the operation was performed so that the superficial velocity was 0.05 m / sec. The temperature at the end of the cooling zone at this time is 421 ° C.
showed that. One day, three days, and seven days after the start of operation, the spheroidizing treatment was temporarily stopped, and the properties of the inner wall deposits from the upper part to the lower part of the furnace and the surface of the SUS plate, which is the inner wall material, were examined. In the upper part, the central part of the cooling zone,
The deposit was powdery at the bottom and had a thickness of 1-5 cm.
No corrosion was observed on the SUS plate. It was confirmed that the operation could be continued.
【００２５】＜実施例２＞結晶性シリカ粉末、プロパン
ガス、酸素の供給量をそれぞれ33kg/Hr、10Nｍ3/h、50N
ｍ3/hとした以外は実施例１と同様にして実施した。空
気量の調整を行い空塔速度を0.33ｍ/secとした。この時
の冷却帯出口温度は511℃を示した。操業開始から1日
後、3日後、7日後に、球状化処理を一旦停止し、炉の上
部から下部にかけての内壁付着物の性状及び内壁材であ
るＳＵＳ板の表面を調べた所、いづれの日数において
も、冷却帯の上部、中央部、下部で付着物は粉状であ
り、厚みは2〜7cｍであった。またＳＵＳ板に腐食はみ
られなかった。引き続き操業可能であるのを確認した。<Embodiment 2> The crystalline silica powder, propane gas, and oxygen are supplied at 33 kg / Hr, 10 Nm 3 / h, and 50 N, respectively.
except that the m 3 / h was carried out in the same manner as in Example 1. The air volume was adjusted and the superficial velocity was set to 0.33 m / sec. At this time, the cooling zone outlet temperature was 511 ° C. One day, three days, and seven days after the start of operation, the spheroidizing treatment was temporarily stopped, and the properties of the inner wall deposits from the upper part to the lower part of the furnace and the surface of the SUS plate, which is the inner wall material, were examined. In the same manner, the deposits were powdery in the upper part, the central part and the lower part of the cooling zone, and the thickness was 2 to 7 cm. No corrosion was observed on the SUS plate. It was confirmed that the operation could be continued.
【００２６】＜実施例３＞結晶性シリカ粉末、プロパン
ガス、酸素の供給量をそれぞれ67kg/Hr、20Nｍ3/h、100
Nｍ3/hとした。空気量の調整を行い空塔速度を1.31ｍ/s
ecとした以外は実施例１と同様に実施した。この時の冷
却帯出口温度は658℃を示した。操業開始から1日後、3
日後、7日後に、球状化処理を一旦停止し、炉の上部か
ら下部にかけての内壁付着物の性状及び内壁材であるＳ
ＵＳ板の表面を調べた所、いづれの日数でも付着物は粉
状であり、厚みは3〜8cｍであった。またＳＵＳ材の表
面に腐食は見られなかった。引き続き操業可能であるの
を確認した。<Example 3> The crystalline silica powder, propane gas, and oxygen were supplied at 67 kg / Hr, 20 Nm 3 / h, and 100, respectively.
It was set to Nm 3 / h. Adjust the amount of air and make the superficial velocity 1.31 m / s
It carried out like Example 1 except having set it as ec. At this time, the outlet temperature of the cooling zone was 658 ° C. 1 day after the start of operation, 3
After 7 days, the spheroidizing process was temporarily stopped, and the properties of the inner wall deposits from the upper part to the lower part of the furnace and the S
When the surface of the US plate was examined, the deposits were powdery and the thickness was 3 to 8 cm in any number of days. No corrosion was found on the surface of the SUS material. It was confirmed that the operation could be continued.
【００２７】＜実施例４＞冷却帯長さを1.5ｍとする以
外は実施例１と同様の球状化装置を配置した。結晶性シ
リカ粉末、プロパンガス、酸素の供給量をそれぞれ67kg
/Hr、20Nｍ3/h、100Nｍ3/hとし、空気量の調整を行い空
塔速度を2.46ｍ/secとした以外は実施例１と同様にして
実施した。この時の冷却帯終端部温度は951℃を示し
た。操業開始から1日後、3日後、7日後に、球状化処理
を一旦停止し、炉の上部から下部にかけての内壁付着物
の性状及び内壁材であるＳＵＳ板の表面を調べた所、い
づれの日数でも付着物は粉状であり、厚みは3〜12cｍで
あった。またＳＵＳ材の表面に腐食は見られなかった。
引き続き操業可能であるのを確認した。<Example 4> The same spheroidizing device as in Example 1 was arranged except that the cooling zone length was 1.5 m. 67 kg each of crystalline silica powder, propane gas, and oxygen supply
/ Hr, and 20Nm 3 / h, 100Nm 3 / h, except that the superficial velocity adjusts the amount of air was 2.46 m / sec was performed in the same manner as in Example 1. At this time, the temperature at the end of the cooling zone was 951 ° C. One day, three days, and seven days after the start of operation, the spheroidizing treatment was temporarily stopped, and the properties of the inner wall deposits from the upper part to the lower part of the furnace and the surface of the SUS plate, which is the inner wall material, were examined. However, the deposit was powdery and had a thickness of 3 to 12 cm. No corrosion was found on the surface of the SUS material.
It was confirmed that the operation could be continued.
【００２８】＜実施例５＞冷却帯長さ6.0ｍとする以外
は実施例１と同様の球状化装置を配置した。結晶性シリ
カ粉末、プロパンガス、酸素の供給量をそれぞれ33kg/H
r、10Nｍ3/h、50Nｍ3/hとし、空気量の調整を行い空塔
速度を0.26ｍ/secとした以外は実施例１と同様に実施し
た。この時の冷却帯出口温度は365℃を示した。操業開
始から1日後、3日後、7日後に、球状化処理を一旦停止
し、炉の上部から下部にかけての内壁付着物の性状及び
内壁材であるＳＵＳ板の表面を調べた所、いづれの日数
でも付着物は粉状であり、厚みは1〜2cｍであった。ま
たＳＵＳ材の表面に腐食は見られなかった。引き続き操
業可能であるのを確認した。<Example 5> The same spheroidizing apparatus as in Example 1 was arranged except that the cooling zone length was 6.0 m. Supplying crystalline silica powder, propane gas, and oxygen at 33 kg / H each
r, 10 Nm 3 / h, 50 Nm 3 / h, and the same procedure as in Example 1 except that the amount of air was adjusted and the superficial velocity was 0.26 m / sec. At this time, the cooling zone outlet temperature was 365 ° C. One day, three days, and seven days after the start of operation, the spheroidizing treatment was temporarily stopped, and the properties of the inner wall deposits from the upper part to the lower part of the furnace and the surface of the SUS plate, which is the inner wall material, were examined. However, the deposit was powdery and had a thickness of 1-2 cm. No corrosion was found on the surface of the SUS material. It was confirmed that the operation could be continued.
【００２９】＜比較例１＞装置、結晶性シリカ粉末、プ
ロパンガス、酸素の供給量は実施例１と同様に行い、コ
ントロールバルブ１４の開度を調整し、空塔速度を0.03
ｍ/secとした。この時の冷却帯終端部温度は297℃を示
した。操業開始から１日後に球状化処理を一旦停止し、
炉内壁の付着物の性状を調査した所、冷却帯下部には付
着が全く見られず、ＳＵＳ表面の所々に腐食物が沈着し
ていた。また得られた球状粉を回収し、篩にかけると、
黒褐色の異物が篩い上に数多く見つかった。操業開始１
日後で操業を停止した。<Comparative Example 1> The apparatus, crystalline silica powder, propane gas, and oxygen were supplied in the same manner as in Example 1, the opening of the control valve 14 was adjusted, and the superficial velocity was 0.03.
It was set to m / sec. At this time, the temperature at the end of the cooling zone was 297 ° C. One day after the start of operation, the spheroidizing process was temporarily stopped,
When the properties of the deposits on the inner wall of the furnace were examined, no deposits were found at the lower part of the cooling zone, and corrosive substances were deposited in various places on the SUS surface. Moreover, when the obtained spherical powder is collected and sieved,
Many black-brown foreign substances were found on the sieve. Start of operation 1
The operation was stopped after a day.
【００３０】＜比較例２＞装置、結晶性シリカ粉末、プ
ロパンガス、酸素の供給量は実施例１と同様に行い、空
気量の調整を行って空塔速度を3.03ｍ/secとした。この
時の冷却帯出口温度は750℃を示した。操業開始から2日
後に輸送配管が閉塞した為、球状化処理を一旦停止し、
炉内壁の付着物の性状を調査した。冷却帯上部の付着物
が焼結しており、一部が落下した形跡が見られた。配管
中の閉塞物は凝集焼結したシリカ粉塊であった。操業開
始２日後で操業停止した。表１に実施例１〜５及び比較
例１、２の試験条件及びその結果をまとめて示す。<Comparative Example 2> The apparatus, crystalline silica powder, propane gas, and oxygen were supplied in the same manner as in Example 1, and the amount of air was adjusted to adjust the superficial velocity to 3.03 m / sec. At this time, the cooling zone outlet temperature was 750 ° C. Two days after the start of operation, the transportation piping was blocked, so the spheroidizing process was temporarily stopped,
The properties of the deposits on the inner wall of the furnace were investigated. The deposit on the upper part of the cooling zone was sintered, and there was evidence that part of it had dropped. The blockage in the pipe was agglomerated and sintered silica powder mass. Two days after the start of operation, the operation was stopped. Table 1 collectively shows the test conditions and the results of Examples 1 to 5 and Comparative Examples 1 and 2.
【００３１】[0031]
【表１】 [Table 1]
【００３２】[0032]
【発明の効果】以上説明したように、本発明の無機質球
状粒子の製造方法では、球状化後の冷却に於いて、炉内
壁への付着を安定させる事ができるので、付着物による
炉内閉塞や配管閉塞を起こすこともなく、また炉内壁劣
化やコンタミ混入を防止する事ができるので、長期にわ
たって安定操業が可能となる。As described above, in the method for producing inorganic spherical particles of the present invention, the adhesion to the inner wall of the furnace can be stabilized in the cooling after spheroidizing, so that the inside of the furnace is blocked by the adhered matter. Since it is possible to prevent deterioration of the inner wall of the furnace and contamination by contamination, it is possible to perform stable operation for a long period of time.
【００３３】[0033]
【図１】球状粒子製造装置の概観図1 is a schematic view of a spherical particle manufacturing apparatus.
【００３４】[0034]
１ 球状化バ−ナ− ２ 冷却ガス（空気吸入口） ３ 冷却水入口 ４ 冷却水出口 ５ 水冷ジャケット外壁 ６ 冷却水貯蔵部 ７ 冷却塔内壁 ８ 冷却帯 ９ 排気連絡口 １０ 粒子一次回収口 １１ 粒子２次回収口 １２ 粒子２次回収用装置 １３ 生成ガス排気用吸引ブロワ− １４ ガス量コントロ−ル用バルブ １５ ガス排出口 １６ 冷却帯出口部温度測定用熱電対式温度計 １７ 火炎流 １８ 吸引空気流 1 Spherical burner 2 Cooling gas (air inlet) 3 Cooling water inlet 4 Cooling water outlet 5 Water cooling jacket outer wall 6 Cooling water storage 7 Cooling tower inner wall 8 cooling zones 9 exhaust communication port 10 Particle primary recovery port 11 Particle secondary collection port 12 Secondary particle recovery device 13 Suction blower for exhausting generated gas 14 Gas volume control valve 15 gas outlet 16 Thermocouple type thermometer for measuring temperature at outlet of cooling zone 17 Flame Flow 18 Suction air flow
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｈ０１Ｌ 23/31 (56)参考文献 特開 昭61−118131（ＪＰ，Ａ) 特開 昭62−241542（ＪＰ，Ａ) 特開 平２−107516（ＪＰ，Ａ) 特開 昭60−156541（ＪＰ，Ａ) 特開 昭62−241541（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B01J 2/16 C01B 33/00 C03B 19/00 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification symbol FI H01L 23/31 (56) References JP-A-61-118131 (JP, A) JP-A-62-241542 (JP, A) Special features Kaihei 2-107516 (JP, A) JP 60-156541 (JP, A) JP 62-241541 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) B01J 2 / 16 C01B 33/00 C03B 19/00
Claims (3)
温火炎中に投入して溶融球状化し、球状粒子を含む燃焼
ガスを冷却帯を通過させながら冷却する無機質球状粒子
の製造方法において、冷却帯のガスの空塔速度を０．０
４〜３．００ｍ／ｓｅｃとすることを特徴とする無機質
球状粒子の製造方法。1. A method for producing inorganic spherical particles, wherein a raw material powder is charged into a high-temperature flame to melt and sphericalize in a metal cooling tower, and combustion gas containing spherical particles is cooled while passing through a cooling zone. The superficial velocity of gas in the cooling zone is 0.0
4 to 3.00 m / sec, a method for producing inorganic spherical particles.
とを特徴とする請求項１記載の無機質球状粒子の製造方
法。2. The method for producing inorganic spherical particles according to claim 1, wherein the outlet temperature of the cooling zone is 400 ° C. or higher.
却塔であって、冷却帯の長さＬと円相当径Ｄの比、Ｌ／
Ｄを２〜５としたことを特徴とする製造装置3. A cooling tower used in the manufacturing method according to claim 1 or 2, wherein the ratio of the length L of the cooling zone to the equivalent circle diameter D, L /
Manufacturing apparatus characterized by setting D to 2 to 5
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22800397A JP3478468B2 (en) | 1997-08-25 | 1997-08-25 | Method and apparatus for producing inorganic spherical particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22800397A JP3478468B2 (en) | 1997-08-25 | 1997-08-25 | Method and apparatus for producing inorganic spherical particles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1157451A JPH1157451A (en) | 1999-03-02 |
| JP3478468B2 true JP3478468B2 (en) | 2003-12-15 |
Family
ID=16869663
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22800397A Expired - Lifetime JP3478468B2 (en) | 1997-08-25 | 1997-08-25 | Method and apparatus for producing inorganic spherical particles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3478468B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010526986A (en) * | 2007-05-11 | 2010-08-05 | エスディーシー マテリアルズ インコーポレイテッド | Heat exchanger, cooling device and cooling method |
| MY155215A (en) * | 2008-05-16 | 2015-09-30 | Denki Kagaku Kogyo Kk | Amorphous silica powder, process for its production and its use |
| JP5068720B2 (en) * | 2008-09-25 | 2012-11-07 | 中外炉工業株式会社 | Spherical particle production equipment |
| US20110300384A1 (en) * | 2008-12-22 | 2011-12-08 | Denki Kagaku Kogyo Kabushiki Kaisha | Powder, method for producing same, and resin composition containing same |
| JP6305007B2 (en) * | 2013-10-18 | 2018-04-04 | 新日鉄住金マテリアルズ株式会社 | Spherical amorphous silica particles, method for producing the same, and resin composition containing the same |
| CN111566048B (en) | 2018-01-26 | 2023-05-09 | 电化株式会社 | Amorphous silica powder, process for producing the same, and use thereof |
| KR102049600B1 (en) * | 2018-03-16 | 2019-11-27 | 창원대학교 산학협력단 | method for manufacturing ceramics nano fused compositee heat-release film |
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1997
- 1997-08-25 JP JP22800397A patent/JP3478468B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JPH1157451A (en) | 1999-03-02 |
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