JPH0660333B2 - Blast furnace tuyere insulation ring - Google Patents
Blast furnace tuyere insulation ringInfo
- Publication number
- JPH0660333B2 JPH0660333B2 JP6497988A JP6497988A JPH0660333B2 JP H0660333 B2 JPH0660333 B2 JP H0660333B2 JP 6497988 A JP6497988 A JP 6497988A JP 6497988 A JP6497988 A JP 6497988A JP H0660333 B2 JPH0660333 B2 JP H0660333B2
- Authority
- JP
- Japan
- Prior art keywords
- coal
- blast furnace
- tuyere
- ash
- 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 - Fee Related
Links
Landscapes
- Blast Furnaces (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、高炉への微粉炭吹き込み操業を実施する際に
使用する水冷羽口に装着するセラミック断熱リングに関
する。Description: TECHNICAL FIELD The present invention relates to a ceramic heat insulating ring mounted on a water-cooled tuyere used when performing a pulverized coal blowing operation into a blast furnace.
（従来の技術） 高炉羽口廻りの模式図を第１図に示す。(Prior Art) A schematic diagram around the tuyere of a blast furnace is shown in FIG.
高炉炉内の還元効率を高めるために微粉炭吹込パイプ１
から羽口２を介して、微粉炭を高炉内へ吹き込む操業が
開発されてきた。Pulverized coal injection pipe 1 to improve the reduction efficiency in the blast furnace
Has been developed to blow pulverized coal into the blast furnace via tuyere 2.
（発明が解決しようとする課題） ところが、この場合羽口２の水冷による大量の熱損失を
低下させる目的で羽口２の内周面に装着したAl2O3-SiO2
系セラミック断熱リング３に微粉炭の灰分が付着し、羽
口閉塞が発生するという問題点がでてきた。そのため、
現在は熱効率を低下させることになるのであるが、羽口
内周面の断熱リングを取りはずして操業していた。そこ
で本発明者らは、特願昭62-5669号公報に記載した、吹
き込む石炭の1200℃焼成時の灰分化学組成において、Ca
O,Na2O,K2O等の網目修飾酸化物が全灰分の1.8wt％以下
である微粉炭を選択し、吹込操業を行なえば、Al2O3-Si
O2系断熱リングに、微粉炭灰分が付着せずに操業できる
ことを発明した。(Problems to be solved by the invention) However, in this case, Al 2 O 3 -SiO 2 mounted on the inner peripheral surface of the tuyere 2 for the purpose of reducing a large amount of heat loss due to water cooling of the tuyere 2.
As a result, the ash content of pulverized coal adheres to the system ceramic heat insulating ring 3 to cause tuyere blockage. for that reason,
At present, the thermal efficiency will be reduced, but the heat insulating ring on the inner surface of the tuyere was removed and the plant was operating. Therefore, the inventors of the present invention described in Japanese Patent Application No. 62-5669, in the ash chemical composition of the coal blown at 1200 ℃, the Ca content
If pulverized coal with a network-modifying oxide such as O, Na 2 O, K 2 O having a total ash content of 1.8 wt% or less is selected and blowing operation is performed, Al 2 O 3 -Si
The inventor has invented that the O 2 system heat insulating ring can be operated without adhering pulverized coal ash.
ところが、石炭を海外から輸入している現状では、上述
の網目修飾酸化物の含有量が1.8wt％以下の石炭を定常
的に確保するのは、困難であり、在庫がなくなると同時
に、網目修飾酸化物が1.8wt％より多い石炭を吹き込ま
ねばならない事態が発生し、約１週間程度の吹き込み
で、羽口閉塞が発生するという問題点がでてきた。However, under the current situation of importing coal from overseas, it is difficult to constantly secure coal with a content of the above network modifying oxide of 1.8 wt% or less, and at the same time as stock runs out, network modification is performed. There was a problem that coal with more than 1.8 wt% of oxide had to be blown, and tuyere blockage occurred after about 1 week of blowing.
（課題を解決するための手段） そこで、本発明は、1200℃焼成時網目修飾酸化物が1.8
％より多く含有する石炭を用いて、微粉炭吹込操業を実
施しても、石炭灰が付着し難い断熱リングを見いだした
ものである。(Means for Solving the Problems) Therefore, according to the present invention, when the network modifying oxide is fired at 1200 ° C.
Even if a pulverized coal blowing operation is carried out using coal containing more than 100%, a heat insulating ring to which coal ash does not easily adhere is found.
即ち、本発明の高炉羽口断熱リングは、Cr2O3含有量が
１０％以上のセラミックスからなる断熱リング内面の中
心線平均粗さ（Ｒａ）が５μｍ以下であることを特徴と
するものである。That is, the blast furnace tuyere heat insulating ring of the present invention is characterized in that the center line average roughness (Ra) of the inner surface of the heat insulating ring made of ceramics having a Cr 2 O 3 content of 10% or more is 5 μm or less. is there.
以下に本発明をみいだした種々の実験について説明す
る。Various experiments that found the present invention will be described below.
一般に、微粉炭として使用される石炭は、非粘結炭であ
る。網目修飾酸化物が1.8％より多い石炭を４種類準備
した。Generally, the coal used as pulverized coal is non-caking coal. Four types of coal containing more than 1.8% network-modified oxide were prepared.
表１に４種類の石炭の1200℃焼成時の灰分化学組成を示
す。Table 1 shows the ash chemical composition of four types of coal at 1200 ° C.
従来使用してきたリング材質であるAl2O3８６％、SiO2
１３％の化学組成をもつ焼結体で、付着に関する実験を
行った。この焼結体の気孔率は約１５％で、試験片の表
面粗度は、中心線平均粗さＲａ≒１２μｍであった。 Al 2 O 3 86%, SiO 2 which is the conventional ring material
Experiments on adhesion were carried out on sintered bodies with a chemical composition of 13%. The porosity of this sintered body was about 15%, and the surface roughness of the test piece was center line average roughness Ra≈12 μm.
この焼結体の寸法５０×５０×１０mmのものをアルミナ
ルツボ中に入れ、表１に示した４種の石炭粉末中に埋設
させ、1300℃×４hr加熱して付着状況を調査した。評価
方法として焼結体の表と裏に付着した石炭灰分の付着面
積率を算出した。The sintered body having a size of 50 × 50 × 10 mm was placed in an alumina crucible, embedded in the four types of coal powder shown in Table 1, heated at 1300 ° C. for 4 hours, and the adhesion state was investigated. As an evaluation method, the adhering area ratio of the coal ash adhering to the front and back of the sintered body was calculated.
結果は、Ａ炭６０％，Ｂ炭５０％，Ｃ炭３０％，Ｄ炭２
０％という順位であった。The result is 60% A charcoal, 50% B charcoal, 30% C charcoal, 2 D charcoal.
The ranking was 0%.
最も付着していたＡ炭の灰分を観察すると、溶融しガラ
ス化状態で付着しており、灰分の試料中への拡散が認め
られた。When the ash content of the A coal, which had been most attached, was observed, it was found that it was fused and attached in a vitrified state, and that the ash was diffused into the sample.
表１からもわかるように、石炭の灰分は、SiO2-Al2O3が
主体である。このようなSiO2-Al2O3主体のガラス質灰分
との濡れ性が悪い材料として、Cr2O3が知られている。
そこで種々の材料系でCr2O3含有量を変化させたセラミ
ックスを試作し、最も付着率の大きかったＡ炭と付着性
試験を前述と同一の方法で実施した。As can be seen from Table 1, the ash content of coal is mainly SiO 2 -Al 2 O 3 . Cr 2 O 3 is known as a material having poor wettability with such glassy ash mainly composed of SiO 2 —Al 2 O 3 .
Therefore, various ceramics having various Cr 2 O 3 contents were produced as prototypes, and the A charcoal having the largest adhesion rate and the adhesion test were carried out by the same method as described above.
供試セラミックスの化学組成及び石炭灰分の付着面積率
を測定した結果を表２に示す。尚、供試セラミックスの
気孔率は１５％程度で、試験片の表面粗度は、中心線平
均粗さ、Ｒａ≒８〜２０μｍであった。Table 2 shows the results of measuring the chemical composition of the test ceramics and the adhering area ratio of coal ash. The porosity of the test ceramics was about 15%, and the surface roughness of the test piece was the center line average roughness Ra≈8 to 20 μm.
No.１〜７において、Al2O3-Cr2O3系での反応性を調査し
たが、Cr2O3が１０％以上になると石炭灰の付着は、認
められなかった。 In Nos. 1 to 7, the reactivity in the Al 2 O 3 —Cr 2 O 3 system was investigated, but when Cr 2 O 3 was 10% or more, the adhesion of coal ash was not recognized.
これは、No.９〜11のZrO2-Cr2O3系及びNo.12〜13のAl2O
3-ZrO2-Cr2O3系、No.14〜No.15のMgO-Cr2O3系において
も同様であった。This, ZrO 2 of No.9~11 -Cr 2 O 3 system and No.12~13 of Al 2 O
The same was true for the 3 -ZrO 2 -Cr 2 O 3 system and the No. 14 to No. 15 MgO-Cr 2 O 3 systems.
このことより、１０％以上のCr2O3を含有するセラミッ
クスが、石炭灰の付着に対して良好な結果を有する事が
判明した。From this, it was found that the ceramic containing 10% or more of Cr 2 O 3 had good results for the adhesion of coal ash.
しかし、この付着性評価は、静的評価であり、高炉での
微粉炭吹込操業は、燃焼した石炭が羽口断熱リングに動
的にあたることにより、付着が発生しているものと考え
られる。そこで、第２図に示す方法で、動的付着性評価
を行った。However, this adhesion evaluation is a static evaluation, and it is considered that during the pulverized coal injection operation in the blast furnace, the adhesion occurs because the burned coal dynamically hits the tuyere heat insulating ring. Therefore, the dynamic adhesion was evaluated by the method shown in FIG.
つまり、1200℃までCOGバーナ７で熱せられたガス炉６
内の試料置台１０上に供試セラミックス９をモルタル１
１で固定し、微粉炭バーナー８からでる石炭灰を直接供
試セラミックス９にふきあてて、動的付着性評価を行な
うものである。供試セラミックスとしては、表２のNo3,
4,5,6,7,8,10,11,13,15の化学組成を有するものを用
い、表面粗度つまり中心線平均粗さＲａを変化させ、物
理的付着を評価する。試験は、200メッシュ以下のＡ炭
で実施した。結果を表３に示す。In other words, the gas furnace 6 heated by the COG burner 7 up to 1200 ℃
Put the sample ceramics 9 on the sample table 10 in the mortar 1
It is fixed at 1, and the coal ash discharged from the pulverized coal burner 8 is directly sprayed on the test ceramics 9 for dynamic adhesion evaluation. As the ceramics under test, No. 3 in Table 2,
Using those having a chemical composition of 4,5,6,7,8,10,11,13,15, the surface roughness, that is, the center line average roughness Ra is changed and the physical adhesion is evaluated. The test was performed on A charcoal of 200 mesh or less. The results are shown in Table 3.
No.16〜18のように中心線平均粗さＲａが、5.0μｍ以下
では、Ａ炭灰の付着は認められないが、5.0μｍをこえ
たNo.19、No.20では、付着が認められた。 When the centerline average roughness Ra is 5.0 μm or less as in Nos. 16 to 18, the carbon ash A is not adhering, but in No. 19 and No. 20 where it exceeds 5.0 μm, the adhering is recognized. It was
以上の結果から、Cr2O3含有量が１０％以上のセラミッ
クスで、かつ試料の中心線平均粗さＲａが5.0μｍ以下
なら、石炭灰の付着対策には有効である。From the above results, if the content of Cr 2 O 3 is 10% or more and the center line average roughness Ra of the sample is 5.0 μm or less, it is effective as a countermeasure against coal ash adhesion.
（実施例） Ｒａ＝0.2，5.0μｍの内面粗度を有する９０％Al2O3，
１０％Cr2O3の断熱リング及び、従来のAl2O3-SiO2断熱
リング（Al2O3：８６％，SiO2：１３％，Ｒａ≒0.2μｍ
まで研磨）を用いて、実機試験を実施した。試験は、Ａ
炭を200メッシュ以下に粉砕し、高炉の試験用羽口か
ら、約１ヶ月吹き込んだ。操業条件を表４に示す。(Example) Ra = 0.2, 90% Al 2 O 3 having an inner surface roughness of 5.0 μm,
10% Cr 2 O 3 heat insulating ring and conventional Al 2 O 3 —SiO 2 heat insulating ring (Al 2 O 3 : 86%, SiO 2 : 13%, Ra≈0.2 μm
The actual machine test was carried out. The test is A
The charcoal was crushed to 200 mesh or less and blown through the test tuyere of the blast furnace for about 1 month. Table 4 shows the operating conditions.
従来のAl2O3-SiO2断熱リングでは約１週間稼動後、リン
グ内が閉塞状態になったので、定修時に断熱リングを取
りはずした。Ｒａ＝0.2，5.0の内面粗度を有する９０％
Al2O3，１０％Cr2O2の断熱リングでは、約６ヶ月稼動し
てもリング内の閉塞は認められなかった。又５０％Al2O
3-５０％Cr2O3固溶体リング（Ｒａ＝5.0μｍ）を、水冷
羽口に装着し、表４の操業条件で各種石炭銘柄（Ａ〜
Ｄ、網目修飾酸化物1.8％以上）の吹き込みを約６ヶ月
間実施したが、リングに石炭灰の付着は認められなかっ
た。 The conventional Al 2 O 3 -SiO 2 heat insulating ring was closed for about 1 week, and the inside of the ring became blocked, so the heat insulating ring was removed during regular repairs. 90% with an inner surface roughness of Ra = 0.2, 5.0
With the heat insulating ring made of Al 2 O 3 and 10% Cr 2 O 2 , no clogging was observed in the ring even after operating for about 6 months. 50% Al 2 O
A 3-50% Cr 2 O 3 solid solution ring (Ra = 5.0 μm) was attached to the water-cooled tuyere, and various coal brands (A to
Blowing of D, network-modifying oxide (1.8% or more) was carried out for about 6 months, but adhesion of coal ash to the ring was not observed.
（発明の効果） 本発明のCrO3含有量が１０％以上のセラミックスからな
る断熱リング内面の中心線平均粗さＲａが５μｍ以下で
ある高炉羽口断熱リングを用いれば、石炭の1200℃焼成
時に網目修飾酸化物が1.8％以上含有する微粉炭を用い
て、微粉炭吹込操業を実施しても、リングへの石炭灰分
の付着がなく、高炉の省エネルギー操業に有効である。(Effect of the Invention) When the blast furnace tuyere heat insulating ring having a center line average roughness Ra of the inner surface of the heat insulating ring made of ceramics having a CrO 3 content of 10% or more according to the present invention is 5 μm or less, coal is burned at 1200 ° C. Even if pulverized coal blowing operation is performed using pulverized coal containing 1.8% or more of network modifying oxide, coal ash does not adhere to the ring, which is effective for energy saving operation of blast furnace.
第１図は、高炉羽口廻りの模式図、第２図は、動的石炭
灰付着性評価試験方法の説明図である。 １…微粉炭吹込パイプ、 ２…羽口、３…セラミック断熱リング、 ４…付着灰分、５…ブローパイプ、 ６…ガス炉、７…COGバーナー、 ８…微粉炭バーナー、 ９…供試セラミックス、 １０…試料置台、 １１…供試セラミックス固定用モルタル。FIG. 1 is a schematic diagram around the tuyere of a blast furnace, and FIG. 2 is an explanatory diagram of a dynamic coal ash adhesion evaluation test method. 1 ... Pulverized coal injection pipe, 2 ... Tuyere, 3 ... Ceramic heat insulation ring, 4 ... Adhesive ash content, 5 ... Blow pipe, 6 ... Gas furnace, 7 ... COG burner, 8 ... Pulverized coal burner, 9 ... Test ceramics, 10 ... Sample holder, 11 ... Mortar for fixing sample ceramics.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 長谷川 順三 東京都千代田区大手町２丁目６番３号 新 日本製鐵株式會社内 (56)参考文献 特開 昭59−47306（ＪＰ，Ａ) 特開 昭51−130646（ＪＰ，Ａ) 実開 昭61−111951（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Junzo Hasegawa 2-6-3 Otemachi, Chiyoda-ku, Tokyo In-house Nippon Steel Co., Ltd. (56) Reference JP-A-59-47306 (JP, A) Japanese Unexamined Patent Publication No. 51-130646 (JP, A) Actual No. 61-111951 (JP, U)
Claims (1)
からなる断熱リング内面の中心線平均粗さ（Ra）が５μ
ｍ以下であることを特徴とする高炉羽口断熱リング。1. A center line average roughness (Ra) of the inner surface of a heat insulating ring made of ceramics having a Cr 2 O 3 content of 10% or more is 5 μm.
A blast furnace tuyere heat insulation ring characterized by being m or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6497988A JPH0660333B2 (en) | 1988-03-18 | 1988-03-18 | Blast furnace tuyere insulation ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6497988A JPH0660333B2 (en) | 1988-03-18 | 1988-03-18 | Blast furnace tuyere insulation ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01240608A JPH01240608A (en) | 1989-09-26 |
| JPH0660333B2 true JPH0660333B2 (en) | 1994-08-10 |
Family
ID=13273679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6497988A Expired - Fee Related JPH0660333B2 (en) | 1988-03-18 | 1988-03-18 | Blast furnace tuyere insulation ring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0660333B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03111549U (en) * | 1990-02-28 | 1991-11-14 | ||
| JP6461588B2 (en) * | 2014-12-12 | 2019-01-30 | 川崎重工業株式会社 | Combustion system |
-
1988
- 1988-03-18 JP JP6497988A patent/JPH0660333B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01240608A (en) | 1989-09-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |