JPH07113124B2 - Manufacturing method of tuyere insulation ring for pulverized coal injection blast furnace - Google Patents
Manufacturing method of tuyere insulation ring for pulverized coal injection blast furnaceInfo
- Publication number
- JPH07113124B2 JPH07113124B2 JP11504494A JP11504494A JPH07113124B2 JP H07113124 B2 JPH07113124 B2 JP H07113124B2 JP 11504494 A JP11504494 A JP 11504494A JP 11504494 A JP11504494 A JP 11504494A JP H07113124 B2 JPH07113124 B2 JP H07113124B2
- Authority
- JP
- Japan
- Prior art keywords
- tuyere
- pulverized coal
- blast furnace
- insulation ring
- heat insulating
- 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
Landscapes
- Blast Furnaces (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、微粉炭吹込高炉の羽口
内面に設けられる羽口断熱リングの製造方法に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a tuyere heat insulating ring provided on the inner surface of a tuyere of a pulverized coal blowing blast furnace.
【０００２】[0002]
【従来の技術】図１は、従来の高炉送風羽口の構造を示
す部分断面図であり、図１において１は高炉送風羽口
（以下、単に「羽口」という）、２は羽口断熱リング、
３はブローパイプ、４は微粉炭吹込パイプである。2. Description of the Related Art FIG. 1 is a partial cross-sectional view showing the structure of a conventional blast furnace blast tuyere. In FIG. 1, 1 is a blast furnace blast tuyere (hereinafter simply referred to as "tuyere"), and 2 is tuyere insulation. ring,
Reference numeral 3 is a blow pipe, and 4 is a pulverized coal blowing pipe.
【０００３】高炉操業において、炉内に熱風を吹込む羽
口１は、高温の溶銑滓が存在する炉内雰囲気に直接さら
されるので、その破損を防ぎ延命をはかるために、一般
に熱伝導性の良い銅で製作され、かつ内部は高流速の淡
水あるいは海水で強制冷却される構造になっている。し
たがって炉内に供給される熱風の熱損失を招くこととな
り、従来より羽口内面に多孔質の耐火物からなる羽口断
熱リング２を挿嵌することによって熱風の羽口冷却水へ
の熱損失を抑制してきた。In the operation of a blast furnace, the tuyere 1 for blowing hot air into the furnace is directly exposed to the atmosphere in the furnace in which high-temperature molten pig iron is present, and therefore, in order to prevent its damage and prolong its life, it is generally made of a heat conductive material. It is made of good copper, and the inside is forcibly cooled by high-velocity fresh water or seawater. Therefore, the heat loss of the hot air supplied to the furnace is caused, and the heat loss of the hot air to the tuyere cooling water by inserting the tuyere heat insulating ring 2 made of a porous refractory on the inner surface of the tuyere is conventionally performed. Has been suppressed.
【０００４】ところが近年、補助燃料として羽口から微
粉炭を吹込む技術が開発されたが、微粉炭の灰分が前記
羽口断熱リング２に付着堆積し、遂には羽口を閉塞する
という問題が発生することから、羽口断熱リングが使え
ず、多量の熱損失を余儀なくされながら操業を続けてい
る。この問題を解決するための手段として、特開平１−
２４０６０８号公報に示された羽口断熱リングがある。In recent years, however, a technique has been developed in which pulverized coal is blown from the tuyere as an auxiliary fuel, but the problem is that the ash content of the pulverized coal adheres to and accumulates on the tuyere insulation ring 2 and eventually blocks the tuyere. As the heat is generated, the tuyere heat insulating ring cannot be used and a large amount of heat loss is inevitable, and the plant continues to operate. As means for solving this problem, Japanese Patent Application Laid-Open No. 1-
There is a tuyere insulation ring shown in 240608.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前記特
開平１−２４０６０８号公報に示された羽口断熱リング
は、リングを構成するセラミックスが緻密質であるため
に断熱効果が低下すること、熱衝撃に弱く割れ易いこ
と、円錐台形状の羽口断熱リングを５μｍの粗さに仕上
げ加工するには、高度の技術を要し、従来の羽口断熱リ
ングに比較して高価となり、実用性に欠ける等の問題点
がある。However, in the tuyere heat insulating ring disclosed in Japanese Patent Laid-Open No. 1-260608, the heat insulating effect is reduced because the ceramics constituting the ring are dense, and the thermal shock It is weak and easy to crack, and it takes a high level of technology to finish the truncated cone-shaped tuyere insulation ring to a roughness of 5 μm, and it is more expensive and less practical than the conventional tuyere insulation ring. There are problems such as.
【０００６】本発明は、かかる問題点を解決するために
なされたものであり、従来の多孔質羽口断熱リングの内
面に特定の混合物を塗布し焼成することによって所期の
優れた効果を奏する羽口断熱リングの製造方法を提供す
ることを目的とする。The present invention has been made in order to solve the above problems, and has a desired excellent effect by applying a specific mixture to the inner surface of a conventional porous tuyere heat insulating ring and baking the mixture. An object is to provide a method for manufacturing a tuyere heat insulating ring.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係る微粉炭吹込高炉用羽口断熱リングの製
造方法は、１〜１５μｍの焼成アルミナ微粉と、重リン
酸アルミニウム溶液をそれぞれ２対８から６対４の範囲
で混合したものを羽口断熱リングの内面に塗布し、５５
０℃以上で焼成することとしているのである。In order to achieve the above object, a method for manufacturing a tuyere insulation ring for a pulverized coal blowing blast furnace according to the present invention is a method of producing a burned alumina fine powder of 1 to 15 μm and an aluminum diphosphate solution. Apply the mixture in the range of 2: 8 to 6: 4 to the inner surface of the tuyere insulation ring,
The firing is performed at 0 ° C or higher.
【０００８】本発明において、焼成アルミナ微粉の粒度
を１〜１５μｍとしたのは、下記表１に示す如く１μｍ
未満では緻密過ぎるため熱衝撃に弱く、割れが発生する
からである。また１５μｍを超えると表面粗さが大きく
なり微粉炭の付着が観察されるためである。In the present invention, the particle size of the calcined alumina fine powder is set to 1 to 15 μm as shown in Table 1 below.
If it is less than the above range, it is too dense and is vulnerable to thermal shock and cracks occur. Further, if it exceeds 15 μm, the surface roughness becomes large and the adhesion of pulverized coal is observed.
【０００９】[0009]
【表１】 [Table 1]
【００１０】また、焼成アルミナ微粉と重リン酸アルミ
ニウム溶液の混合比については、断熱リング内面へ塗布
する時に、適当な流動性を保持するために決定される。
すなわち、それぞれの比率が１対９では流れ過ぎ、７対
３では塗布不能であるためである。The mixing ratio of the calcined alumina fine powder and the aluminum biphosphate solution is determined so as to maintain proper fluidity when applied to the inner surface of the heat insulating ring.
That is, when the respective ratio is 1: 9, the flow is too much, and when the ratio is 7: 3, the application is impossible.
【００１１】また、焼成温度を５５０℃以上としたの
は、重リン酸アルミニウム溶液が５５０℃以上で脱水が
完全に完了し、安定化するためである。The reason why the firing temperature is set to 550 ° C. or higher is that the dehydration of the aluminum biphosphate solution is completed and stabilized at 550 ° C. or higher.
【００１２】[0012]
【作用】本発明においては、焼成アルミナ微粉と重リン
酸アルミニウム溶液の混合物が多孔質羽口断熱リングの
内面に塗布・焼成されているので、断熱性が保持され、
しかも微粉炭灰分の付着が防止される。In the present invention, the mixture of calcined alumina fine powder and aluminum biphosphate solution is applied and calcined on the inner surface of the porous tuyere heat insulating ring, so that the heat insulating property is maintained,
Moreover, the adhesion of fine coal ash is prevented.
【００１３】[0013]
【実施例】本発明の羽口断熱リングの製造方法は、例え
ば従来使用されているSiC:96％、気孔率15％からなる羽
口断熱リングの内面に1 〜15μｍの焼成アルミナ微粉
と、重リン酸アルミニウム溶液をそれぞれ２対８から６
対４の範囲で混合したものを塗布し、５５０℃以上で焼
成するものである。EXAMPLE A method for producing a tuyere heat insulating ring of the present invention is, for example, a conventionally used SiC tuft of 96% and a porosity of 15%. Aluminum phosphate solution 2 to 8 to 6 respectively
The mixture is applied in the range of 4 to 4 and baked at 550 ° C. or higher.
【００１４】ちなみに、微粉炭吹込高炉の操業条件とし
て、送風量：3800Nm3/min 、送風温度：９００℃、微粉
炭吹込量：２０ｔｏｎ／Ｈｒとし、Ａ：羽口断熱リング
なし、Ｂ：羽口断熱リング取付（SiC ）、Ｃ：本発明方
法により製造した羽口断熱リング取付、の試料について
微粉炭灰分付着状況、羽口抜熱量（給排水温度差ΔＴ）
等の効果を比較したところ、下記表２に示すような結果
を得た。なおこの試験において適用した羽口断熱リング
としては、粉液混合比：５対５、塗布厚み：0.5mm 、焼
成温度：６００℃である。By the way, the operating conditions of the pulverized coal blowing blast furnace are as follows: blast volume: 3800 Nm 3 / min, blast temperature: 900 ° C., pulverized coal volume: 20 ton / Hr, A: no tuyere insulation ring, B: tuyere For samples of heat insulating ring attachment (SiC), C: attachment of tuyere heat insulating ring manufactured by the method of the present invention, pulverized coal ash adhesion state, tuyere heat removal amount (supply / drainage temperature difference ΔT)
When the effects of the above were compared, the results shown in Table 2 below were obtained. The tuyere insulation ring applied in this test had a powder-liquid mixing ratio of 5: 5, a coating thickness of 0.5 mm, and a firing temperature of 600 ° C.
【００１５】[0015]
【表２】 [Table 2]
【００１６】表２より明らかなように本発明方法により
製造した羽口断熱リングの優秀さが判る。As is clear from Table 2, the superiority of the tuyere insulation ring manufactured by the method of the present invention can be seen.
【００１７】[0017]
【発明の効果】本発明は以上説明したように、従来の多
孔質羽口断熱リングの内面に、焼成アルミナ微粉と、重
リン酸アルミニウム溶液の混合物を塗布・焼成するもの
であり、断熱性の保持、微粉炭灰分付着防止上優れた効
果があり、しかも従来使用されている羽口断熱リングに
即適用することができるので安価に実用化でき、長期間
の安定した使用が可能である。As described above, the present invention applies and fires a mixture of calcined alumina fine powder and aluminum biphosphate solution on the inner surface of a conventional porous tuyere heat insulating ring, which has a heat insulating property. It has an excellent effect of holding and preventing the adhesion of pulverized coal ash, and since it can be immediately applied to the conventionally used tuyere heat insulating ring, it can be put to practical use at low cost and can be used stably for a long period of time.
【図１】高炉用羽口構造を示す部分断面図である。FIG. 1 is a partial cross-sectional view showing a tuyere structure for a blast furnace.
１ 高炉送風羽口 ２ 羽口断熱リング ３ ブローパイプ ４ 微粉炭吹込パイプ 1 Blast furnace blast tuyere 2 Tuyere insulation ring 3 Blow pipe 4 Pulverized coal injection pipe
───────────────────────────────────────────────────── フロントページの続き (72)発明者 近藤 淳 和歌山県和歌山市湊1850番地 住友金属工 業株式会社 和歌山製鉄所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Kondo 1850 Minato, Wakayama City, Wakayama Prefecture Sumitomo Metal Industries, Ltd. Wakayama Works
Claims (1)
リン酸アルミニウム溶液をそれぞれ２対８から６対４の
範囲で混合したものを羽口断熱リングの内面に塗布し、
５５０℃以上で焼成することを特徴とする微粉炭吹込高
炉用羽口断熱リングの製造方法。1. A mixture of 1 to 15 .mu.m calcined alumina fine powder and aluminum biphosphate solution in the range of 2: 8 to 6: 4 is applied to the inner surface of the tuyere heat insulating ring,
A method for producing a tuyere insulation ring for a pulverized coal blowing blast furnace, which comprises firing at 550 ° C or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11504494A JPH07113124B2 (en) | 1994-05-27 | 1994-05-27 | Manufacturing method of tuyere insulation ring for pulverized coal injection blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11504494A JPH07113124B2 (en) | 1994-05-27 | 1994-05-27 | Manufacturing method of tuyere insulation ring for pulverized coal injection blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06340908A JPH06340908A (en) | 1994-12-13 |
| JPH07113124B2 true JPH07113124B2 (en) | 1995-12-06 |
Family
ID=14652803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11504494A Expired - Lifetime JPH07113124B2 (en) | 1994-05-27 | 1994-05-27 | Manufacturing method of tuyere insulation ring for pulverized coal injection blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07113124B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102994676A (en) * | 2012-12-20 | 2013-03-27 | 武钢集团昆明钢铁股份有限公司 | Small wear-resistant bush for blast-furnace tuyere and manufacture method thereof |
-
1994
- 1994-05-27 JP JP11504494A patent/JPH07113124B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102994676A (en) * | 2012-12-20 | 2013-03-27 | 武钢集团昆明钢铁股份有限公司 | Small wear-resistant bush for blast-furnace tuyere and manufacture method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06340908A (en) | 1994-12-13 |
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