JP3140473B2 - Addition method of anti-fusing material for artificial lightweight aggregate - Google Patents
Addition method of anti-fusing material for artificial lightweight aggregateInfo
- Publication number
- JP3140473B2 JP3140473B2 JP02415869A JP41586990A JP3140473B2 JP 3140473 B2 JP3140473 B2 JP 3140473B2 JP 02415869 A JP02415869 A JP 02415869A JP 41586990 A JP41586990 A JP 41586990A JP 3140473 B2 JP3140473 B2 JP 3140473B2
- Authority
- JP
- Japan
- Prior art keywords
- fusing material
- fusing
- rotary kiln
- lightweight aggregate
- artificial lightweight
- 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 - Fee Related
Links
Landscapes
- Muffle Furnaces And Rotary Kilns (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は軽量骨材の焼成時にお
いて融着防止を計るための方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing fusion during firing of lightweight aggregate.
【０００２】[0002]
【従来の技術】従来、人工軽量骨材の製造に際しては、
膨張性頁岩、粘土、石炭灰等を粒状にして回転窯で焼成
し、発泡軽量化するものである。2. Description of the Related Art Conventionally, when manufacturing artificial lightweight aggregate,
Expansive shale, clay, coal ash and the like are granulated and fired in a rotary kiln to reduce foaming and weight.
【０００３】[0003]
【発明が解決しようとする課題】併し乍ら、この様な焼
成方法は実際には極めて難しく、市販されている絶乾見
掛比重１.２〜１.３程度の軽量骨材を焼成するためには
粒子表面を溶融状態になる迄、焼成温度を上昇する必要
がある。つまり、粒子同志が融着して塊状または柱状に
なる場合も少なくなく、この融着を防止することが必要
である。However, such a sintering method is extremely difficult in practice. In order to sinter a commercially available lightweight aggregate having an apparent specific gravity of about 1.2 to 1.3, it is difficult to sinter it. It is necessary to raise the sintering temperature until the particle surface becomes molten. That is, the particles often fuse together to form a block or a columnar shape, and it is necessary to prevent the fusion.
【０００４】この様な融着を防止するために、運転操作
によって一部不良品の発生を覚悟で対応している場合も
あるが、一方高融点物質であるアルミナ系、シリカ系融
着防止材を添加する場合もある。[0004] In order to prevent such fusing, there are cases in which some defective products are prepared by the driving operation, but on the other hand, alumina-based and silica-based anti-fusing materials which are high melting point materials are used. May be added.
【０００５】更に、融着防止材を添加しない場合には、
粒子同志の融着による不良品の発生の問題がある。[0005] Further, when no anti-fusing material is added,
There is a problem of defective products due to fusion of particles.
【０００６】また、融着防止材の添加方法としては、窯
尻から原料と一緒に投入する方法と、バーナ側から投入
する方法があるが、前者は投入時に回転窯から排ガスと
一緒に融着防止材が系外に飛散する問題があり、特に融
着防止材の粒度が小さいと５０％以上も系外に飛散する
問題がある。一方、飛散防止のために融着防止材の粒度
を粗くすると、軽骨表面にザラメ状に融着防止材が付着
して軽量化を阻害すると共に、融着防止効果が半減する
傾向がある。As a method of adding the anti-fusing material, there are a method of charging the raw material together with the raw material from the kiln tail and a method of charging the raw material from the burner side. There is a problem that the preventive material scatters outside the system, and particularly when the particle size of the anti-fusing material is small, there is a problem that 50% or more of the preventive material scatters outside the system. On the other hand, when the particle size of the anti-fusing material is made coarse to prevent scattering, the anti-fusing material tends to adhere to the surface of the light bone in a lame manner, impairing the weight reduction and reducing the anti-fusing effect by half.
【０００７】他方、融着防止材をバーナ吹込側から機械
的に焼点部に投入する方法があり、この場合には、例え
ばスクリュウコンベヤの原理を応用して焼点部まで融着
防止材を運んで、焼点部に融着防止材を投入する所謂機
械的投入方法である。On the other hand, there is a method in which the anti-fusing material is mechanically put into the burning point from the burner blowing side. In this case, for example, the principle of the screw conveyor is used to apply the anti-fusing material to the burning point. This is a so-called mechanical charging method of transporting and charging the anti-fusing material into the burning spot.
【０００８】この様な方法は、融着防止材を的確に効率
良く投入することが出来るが、耐高温の対策が大掛かり
となり、特に回転窯が大型化した場合には焼点部まで設
備を延長する必要があり、設備的に極めて難しいものと
なる。[0008] Such a method makes it possible to introduce the anti-fusing material accurately and efficiently, but it requires large measures to withstand high temperatures. Particularly when the rotary kiln is enlarged, the equipment is extended to the burning point. And it becomes extremely difficult in terms of equipment.
【０００９】また、従来技術として回転窯のバーナ側か
ら空気圧送方式で融着防止材を投入する方式もあるが、
融着防止材が燃焼ガスと共に飛散して効率的に焼点部に
供給するのが難しく、また吹込空気によって窯内の焼成
雰囲気を乱して制御が難しい問題がある。[0009] As a conventional technique, there is also a method in which an anti-fusing material is introduced from the burner side of a rotary kiln by an air pressure feeding method.
There is a problem that it is difficult for the anti-fusing material to be scattered together with the combustion gas and efficiently supplied to the burning point, and that the blowing atmosphere disturbs the firing atmosphere in the kiln, making it difficult to control.
【００１０】この発明の目的は、この様な従来における
種々な課題を解決するために、焼点部に融着防止材を安
定して効率良く添加する方法を提供することにある。An object of the present invention is to provide a method for stably and efficiently adding an anti-fusing material to a hot spot in order to solve such various conventional problems.
【００１１】[0011]
【課題を解決するための手段】上述の目的を達成するた
めに、この発明に依れば、人工軽量骨材の融着防止材の
添加方法は、回転窯における人工軽量骨材の焼成に際し
て、回転窯内の焼点部近傍に融着防止材を効果的に添加
するためにキルンバーナ側から空気圧送方式によってパ
ルス状に断続的に融着防止材を一群の塊状体にして吹込
むことを特徴としている。In order to achieve the above-mentioned object, according to the present invention, a method for adding an anti-fusing material for an artificial lightweight aggregate includes a method for firing an artificial lightweight aggregate in a rotary kiln. In order to effectively add the anti-fusing material to the vicinity of the burning point in the rotary kiln, the anti-fusing material is intermittently blown in a pulse form from the kiln burner side by the air pumping method. And
【００１２】この発明の他の目的や特徴および利点は以
下の添付図面に沿っての詳細な説明から明らかになろ
う。Other objects, features and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.
【００１３】[0013]
【実施例】図１には、この発明の人工軽量骨材の融着防
止材の添加方法を実施するための融着防止材の添加装置
の一例が示されており、図示される様に、ロータリーキ
ルンの様な回転窯１において、回転窯１内の焼点部２近
傍に融着防止材を供給するように回転窯１のバーナ３側
の壁部を貫通して融着防止材用供給管４が回転窯１内に
延びており、この供給管４の先端部の過熱を防止するよ
うに供給管４の先端部の周りに冷却用の水冷ジャケット
５が設けられている。この融着防止材用の供給管４は融
着防止材６を空気圧送するよう適宜な高圧空気源（図示
しない）に接続されると共に、下部にロータリーバルブ
８を有した融着防止材タンク７が接続されている。この
融着防止材タンク７内の融着防止材６は、ロータリーバ
ルブ８を適宜なタイマーコントローラ９によって所定の
時間を以て作動することによって所定の量を供給でき、
高圧空気源からの高圧空気をタイマーパルス信号制御器
１１によって電磁弁１０を一定時間を以て開閉すること
によって断続的に供給して、融着防止材６を回転窯１内
の焼点部２に供給することができる。FIG. 1 shows an example of an apparatus for adding an anti-fusing material for carrying out the method of adding an anti-fusing material for artificial lightweight aggregates according to the present invention. In a rotary kiln 1 such as a rotary kiln, a supply pipe for the anti-fusing material penetrates through the wall of the rotary kiln 1 on the burner 3 side so as to supply the anti-fusing material to the vicinity of the burning part 2 in the rotary kiln 1. 4 extends into the rotary kiln 1, and a water cooling jacket 5 for cooling is provided around the distal end of the supply pipe 4 so as to prevent overheating of the distal end of the supply pipe 4. The supply pipe 4 for the anti-fusing material is connected to an appropriate high-pressure air source (not shown) so as to pneumatically feed the anti-fusing material 6, and the anti-fusing material tank 7 having a rotary valve 8 at the bottom. Is connected. A predetermined amount of the anti-fusing material 6 in the anti-fusing material tank 7 can be supplied by operating the rotary valve 8 with a suitable timer controller 9 for a predetermined time,
The high pressure air from the high pressure air source is intermittently supplied by opening and closing the electromagnetic valve 10 for a fixed time by the timer pulse signal controller 11, and the fusion preventing material 6 is supplied to the burning spot 2 in the rotary kiln 1. can do.
【００１４】融着防止材タンク７内の使用される融着防
止材は断続的にパルス方式で回転窯１内の焼点部２近傍
に粉体塊状で投入される。このために、融着防止材は粉
体同志の相互作用によってあたかも粉体塊状体として投
入されるので、飛散が少なく、効率的に回転窯１の焼点
部２近傍に投入される。The anti-fusing material used in the anti-fusing material tank 7 is intermittently supplied in the form of a powder in the vicinity of the burning point 2 in the rotary kiln 1 by a pulse method. For this reason, since the anti-fusing material is supplied as a powder mass by the interaction of the powders, the anti-fusing material is less scattered and is efficiently supplied to the vicinity of the burning part 2 of the rotary kiln 1.
【００１５】一方、融着防止材の投入量は焼成物に対し
て３〜１０％程度であるために一般的には数分〜数十分
に１回の投入で良く、従って、回転窯１内に投入される
空気量も少なく、焼成状態の外乱も少ない。On the other hand, since the amount of the anti-fusing material to be added is about 3 to 10% based on the calcined product, it is generally sufficient to add the anti-fusing material once for several minutes to several tens of minutes. The amount of air introduced into the inside is small, and the disturbance in the firing state is also small.
【００１６】この様に構成されたこの発明の融着防止材
の添加方法を実施するための添加装置においては、先
ず、融着防止材６が融着防止材タンク７内に送入管１４
からロータリーバルブ１２を介して投入される。融着防
止材タンク７内の融着防止材６は、シール性の良いロー
タリーバルブ８によって間欠的に供給管４に落下して供
給粉６’と成る。In the adding apparatus for carrying out the method for adding the anti-fusing material of the present invention thus configured, first, the anti-fusing material 6 is fed into the anti-fusing material tank 7 by the feeding pipe 14.
Through the rotary valve 12. The anti-fusing material 6 in the anti-fusing material tank 7 is intermittently dropped into the supply pipe 4 by the rotary valve 8 having a good sealing property to become the supply powder 6 '.
【００１７】ロータリーバルブ８は、融着防止材６の圧
送時に高圧がかゝるためにシール性を良くし、融着防止
材タンク７からの塵埃の発生を防止するために融着防止
材タンク７に逆圧が掛からない様にする必要がある。The rotary valve 8 is provided with a high-pressure seal during the feeding of the fusion-preventing material 6 so as to improve the sealing property, and to prevent generation of dust from the fusion-prevention material tank 7. It is necessary to prevent back pressure from being applied to 7.
【００１８】供給管４に落下した供給粉６’は、高圧空
気源からの高圧空気をタイマーパルス信号制御器１１お
よび電磁弁１０の開閉によって供給管４を通って間欠的
に回転窯１に投入される。また、高圧空気の圧力は圧力
計１５によって測定される。供給管４は回転窯１内に約
１m程延出しており、水冷ジャケット５によって保護さ
れていて、充分な耐熱性が具備されている。回転窯１内
の焼点部２はバーナ様式、キルンサイズにより異なる
が、一般的に供給管４の先端よりも３〜１０m程回転窯
１の奥にあり、融着防止材が効果的に回転窯１の焼点部
２近傍に投入される。The supply powder 6 'that has fallen into the supply pipe 4 intermittently supplies the high-pressure air from the high-pressure air source to the rotary kiln 1 through the supply pipe 4 by opening and closing the timer pulse signal controller 11 and the solenoid valve 10. Is done. The pressure of the high-pressure air is measured by the pressure gauge 15. The supply pipe 4 extends about 1 m into the rotary kiln 1 and is protected by a water cooling jacket 5 and has sufficient heat resistance. The burning point 2 in the rotary kiln 1 varies depending on the burner style and kiln size, but is generally located about 3 to 10 m deeper than the tip of the supply pipe 4 in the rotary kiln 1, and the anti-fusing material rotates effectively. It is thrown into the vicinity of the burning part 2 of the kiln 1.
【００１９】次に、この発明の人工軽量骨材の融着防止
材の添加方法の実際の１つの例が示される。先ず、石炭
灰にセメント５％を添加後、５〜１２mm直径のペレット
に造粒し、２日間放置養生した後に１５００φmm×２０
０００リットルの回転窯で焼成した。融着防止材はバー
ナ側から焼成原料の５％、約６０kg／時の割合で吹込ま
れた（５kg／１回当たり、送入圧１〜１０kg／cm2程
度）。融着防止材としては７号珪砂を用いた。７号珪砂
の粒度分布は下記の表の通りである。Next, an actual example of the method for adding the anti-fusing material of the artificial lightweight aggregate of the present invention will be described. First, 5% of cement was added to coal ash, and then granulated into pellets having a diameter of 5 to 12 mm.
Fired in a 2,000 liter rotary kiln. The anti-fusing material was blown from the burner side at 5% of the firing material at a rate of about 60 kg / hour (at a feeding pressure of 1 kg / cm 2 per 5 kg / time). No. 7 silica sand was used as an anti-fusing material. The particle size distribution of No. 7 silica sand is as shown in the table below.
【００２０】 ７号珪砂の粒度分布 メッシュ ４８ ７０ １００ １４５ ２００ ２８０ μm ３００ ２１０ １４５ １０５ ７４ ５３ 粒度分布 ０.１ ４.５ ３０.８ ４６.９ １４.７ ２.５ 累積分布 ０.１ ４.６ ３５.４ ８２.３ ９７.０ ９９.５[0020]Particle size distribution of No. 7 silica sand Mesh 48 70 100 145 200 280 μm 300 210 145 105 74 53 53 Particle size distribution 0.1 4.5 30.8 46.9 14.7 2.5 Cumulative distribution 0.1 4.6 35.4 82.3 97. 0 99.5
【００２１】[0021]
【発明の効果】以上に説明した様に、この発明の人工軽
量骨材の融着防止材の添加方法に依れば、高圧空気を断
続的に供給して融着防止材を粉体塊として回転窯内の焼
点部近傍に吹込むので、融着防止材を最小の空気量を以
て回転窯内の焼点部に効果的に投入することが出来て、
融着防止材の飛散も防止できると共に、融着防止材の投
入距離を、回転窯の寸法によって勿論異なるが、融着防
止材粒度と供給管直径と１バッチ毎の融着防止材の量、
吹込空気圧、空気量等によって調節することが出来、更
に、添加装置自体も極めて簡単な構成に造ることが出来
るし、供給管先端部の形状が単純であるので水冷ジャケ
ットによって効果的に冷却保護することが出来る等の効
果が得られる。As described above, according to the method for adding the anti-fusing material of the artificial lightweight aggregate of the present invention, high-pressure air is intermittently supplied to make the anti-fusing material into a powder mass. Since it is blown into the vicinity of the burning point in the rotary kiln, the anti-fusing material can be effectively introduced into the burning point in the rotary kiln with a minimum amount of air.
The scattering of the anti-fusing material can be prevented, and the feeding distance of the anti-fusing material, of course, depends on the size of the rotary kiln. However, the particle size of the anti-fusing material, the diameter of the supply pipe, the amount of the anti-fusing material per batch,
It can be adjusted by the blowing air pressure, the amount of air, etc. In addition, the addition device itself can be made in a very simple configuration, and the shape of the tip of the supply pipe is simple, so it is effectively cooled and protected by a water cooling jacket. And the like.
【図１】この発明の人工軽量骨材の融着防止材の添加方
法を実施するための添加装置の概要図である。FIG. 1 is a schematic view of an adding device for carrying out a method for adding a fusion preventing material for an artificial lightweight aggregate according to the present invention.
１ 回転窯 ２ 焼点部 ３ バーナ ４ 供給管 ５ 水冷ジャケット ６ 融着防止材 ７ 融着防止材タンク ８ ロータリバルブ ９ タイマーコントローラ １０ 電磁弁 １１ タイマーパルス信号制御器 １２ ロータリバルブ １４ 送入管 １５ 圧力計 DESCRIPTION OF SYMBOLS 1 Rotary kiln 2 Burning point 3 Burner 4 Supply pipe 5 Water cooling jacket 6 Anti-fusion material 7 Anti-fusion material tank 8 Rotary valve 9 Timer controller 10 Solenoid valve 11 Timer pulse signal controller 12 Rotary valve 14 Inlet pipe 15 Pressure Total
───────────────────────────────────────────────────── フロントページの続き (72)発明者 末岡 忠士 山口県小野田市大字小野田6276番地 小 野田セメント株式会社資源化学研究室内 (58)調査した分野(Int.Cl.7，ＤＢ名) C04B 14/00 - 28/36 C04B 35/64 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tadashi Sueoka 6276 Onoda, Onoda City, Yamaguchi Prefecture Onoda Cement Co., Ltd. Resource Chemistry Laboratory (58) Field surveyed (Int. Cl. 7 , DB name) C04B 14 / 00-28/36 C04B 35/64
Claims (1)
して、回転窯内の焼点部近傍に融着防止材を効果的に添
加するためにキルンバーナ側から空気圧送方式によって
パルス状に断続的に融着防止材を一群の塊状体にして吹
込むことを特徴とする人工軽量骨材のの融着防止材の添
加方法。1. During firing of an artificial lightweight aggregate in a rotary kiln, in order to effectively add an anti-fusing material in the vicinity of a burning point in the rotary kiln, intermittently in a pulse form by a pneumatic pumping method from a kiln burner side. A method for adding an anti-fusing material to an artificial lightweight aggregate, which comprises blowing the anti-fusing material into a group of masses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02415869A JP3140473B2 (en) | 1990-12-29 | 1990-12-29 | Addition method of anti-fusing material for artificial lightweight aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02415869A JP3140473B2 (en) | 1990-12-29 | 1990-12-29 | Addition method of anti-fusing material for artificial lightweight aggregate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04238846A JPH04238846A (en) | 1992-08-26 |
| JP3140473B2 true JP3140473B2 (en) | 2001-03-05 |
Family
ID=18524144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02415869A Expired - Fee Related JP3140473B2 (en) | 1990-12-29 | 1990-12-29 | Addition method of anti-fusing material for artificial lightweight aggregate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3140473B2 (en) |
-
1990
- 1990-12-29 JP JP02415869A patent/JP3140473B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04238846A (en) | 1992-08-26 |
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