JPS61512A - Waste gas cooler for converter - Google Patents
Waste gas cooler for converterInfo
- Publication number
- JPS61512A JPS61512A JP59120720A JP12072084A JPS61512A JP S61512 A JPS61512 A JP S61512A JP 59120720 A JP59120720 A JP 59120720A JP 12072084 A JP12072084 A JP 12072084A JP S61512 A JPS61512 A JP S61512A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- ceramic
- cooler
- waste gas
- bonding
- 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.)
- Pending
Links
- 239000002912 waste gas Substances 0.000 title claims abstract description 20
- 239000000919 ceramic Substances 0.000 claims abstract description 36
- 239000007789 gas Substances 0.000 claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 229910003310 Ni-Al Inorganic materials 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000000428 dust Substances 0.000 abstract description 10
- 230000035939 shock Effects 0.000 abstract description 7
- 239000010419 fine particle Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 238000005299 abrasion Methods 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 25
- 238000001816 cooling Methods 0.000 description 8
- 238000007664 blowing Methods 0.000 description 6
- 238000007751 thermal spraying Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- -1 Nj-Al4 Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229920001342 Bakelite® Polymers 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004637 bakelite Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4646—Cooling arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は接線フィン、中心ツイン等の管列からなる冷却
器の廃ガス流体側表面に強化処理をした溶射層を形成さ
せセラミック被覆した転炉用廃ガス冷却器に関するもの
である。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a ceramic-coated rotor that forms a reinforced sprayed layer on the exhaust gas fluid side surface of a cooler consisting of tube rows such as tangential fins and central twin tubes. This relates to a waste gas cooler for a furnace.
（従来技術）
転炉操業の際、吹錬時に発生する廃ガスは通常１０００
℃以上になり、この廃ガス中には１００ｍｆｉ／Ｎ−程
度のダストが含まれている。この廃ガス中のダストは粉
塵処理するために転炉ｌの炉上に設けられているスカー
ト２、下部フード３、上部フード４を経て集塵器５に導
かれる。(Prior art) During converter operation, the amount of waste gas generated during blowing is usually 1000
℃ or higher, and this waste gas contains dust of about 100 mfi/N-. The dust in the waste gas is led to a dust collector 5 through a skirt 2, a lower hood 3, and an upper hood 4 provided on the furnace of the converter 1 for dust treatment.
このダストを含んだ高温ガスの通過するスカート２、下
部フード３、および上部フード４は金属で製作され、高
温からケーシングを保護することおよび廃ガスの温度を
下げるだめに冷却されている。この冷却構造としては管
を溶接で接合して管列にした接線フィンタイプおよび中
ｌレフインタイブがちシ実開昭５ｌ−１４０８５８（冷
却管列からなる冷却装置）に公表されているように無被
覆の冷却器になっている。従来は無被覆の捷＼使用され
ていたが冷却器の廃ガス側は吹錬時の廃ガスが通過する
際にダストにより摩耗し、長期間使用されている間に管
肉が減少していた。まだ廃ガスは吹錬時２０〜３０分間
通過し、吹錬後２０〜３０分休市する体、この繰返しで
間けつ的に高温度にさらされるだめ、その熱衝撃により
廃ガス流体側の冷却器表向に長期間使用すると割れが発
生していた。さらには転炉炉上にあるスカート２は吹錬
時の溶鋼のスプラッシュよ９１６００℃以上の溶鋼が付
着するが、ケーシングを高温から保護するだめに冷却さ
れているが、その溶鋼付着により部分的に熱衝撃を受は
損傷していた。The skirt 2, lower hood 3 and upper hood 4 through which the dust-laden hot gas passes are made of metal and are cooled to protect the casing from high temperatures and to reduce the temperature of the waste gas. This cooling structure includes a tangential fin type in which tubes are joined by welding to form a tube row, and a medium-sized reflex type, and an uncoated type as disclosed in the Japanese Act No. 5L-140858 (Cooling device consisting of a cooling tube row). It is a cooler. Previously, uncoated pipes were used, but the waste gas side of the cooler was worn away by dust when the waste gas from blowing passed through, and the pipe thickness decreased during long periods of use. . The waste gas still passes through the body for 20 to 30 minutes during blowing, and then rests for 20 to 30 minutes after blowing.This process is repeatedly exposed to high temperatures intermittently, and the thermal shock causes the cooler on the waste gas fluid side. Cracks appeared on the surface after long-term use. Furthermore, the skirt 2 on the converter furnace is covered with molten steel of 91,600°C or higher due to the molten steel splash during blowing, but although it is cooled to protect the casing from high temperatures, the molten steel may partially adhere to the skirt 2. It was damaged due to thermal shock.
（発明の目的）
本発明は管列からなる冷却器の廃ガス流体側表面をダス
トによる摩耗、熱衝撃による割れ等から耐久性が律速さ
れていたものを高温ガスから冷却器を保護し耐久性の向
上をはかるものである。(Objective of the Invention) The present invention protects the exhaust gas fluid side surface of a cooler consisting of a tube array from high-temperature gas, and improves the durability of the exhaust gas fluid side surface of the cooler, which was limited in its durability from abrasion caused by dust and cracking due to thermal shock. The aim is to improve
（発明の構成）
本発明は、
１ °”）′″−Ｏｇ＃−Ｘ″″４””７１°−ｔｓ
ｉ Ｌ ＜ ｕ＊部をＮｊ−Ａｌ４等のポンディング用
金属溶射層となし、その金属溶射層の上をセラミック溶
射層としたことを特徴とする転炉用廃ガス冷却器。(Structure of the Invention) The present invention provides the following features: 1°")'"-Og#-X""4""71°-ts
A waste gas cooler for a converter, characterized in that the portion where i L < u* is made of a bonding metal sprayed layer such as Nj-Al4, and a ceramic sprayed layer is provided on the metal sprayed layer.
（２）冷却器の廃ガス流体側表面の一部若しくは全部に
Ｎｉ−Ａｌ 等のボンｙ＜グ用金属溶射層となし、その
上にセラミックスと金属を混合しだノ・ψ
一フボンデング溶射層となし、さらにそのノ・−フボン
乏グ溶射層の上をセラミック溶射層としたことを特徴と
する転炉用廃ガス冷却器。(2) A bonding metal sprayed layer such as Ni-Al is formed on part or all of the exhaust gas fluid side surface of the cooler, and on top of that is a bonding thermal sprayed layer with a mixture of ceramics and metal. A waste gas cooler for a converter, characterized in that a ceramic sprayed layer is provided on the carbon-poor sprayed layer.
である。It is.
すなわち、高温ガスから冷却器を保護するだめに耐熱性
があり、しかも耐摩耗性に優れているセラミックスを冷
却機能をそこなわない程度に溶射被覆するものである。That is, in order to protect the cooler from high-temperature gases, ceramics, which have heat resistance and excellent wear resistance, are coated by thermal spraying to an extent that does not impair the cooling function.
冷却器の廃ガス流体側フィンチューブ表面６〜６″′
を溶射前にプラスト処理し、表面に付着しているスケ
ール、ゴミ等を除去として溶射して第１層目７〜７″′
を形成する。つぎにその第１層目７〜７″′ の
上に目的とするセラミックスを溶射し、１９以下の薄肉
層８〜８′″ を被覆する。Cooler exhaust gas fluid side fin tube surface 6~6'''
Before thermal spraying, the first layer is 7~7'''
form. Next, the desired ceramic is thermally sprayed onto the first layer 7 to 7'' to cover the thin layer 8 to 8'' with a thickness of 19 or less.
さらには第３図および第５図に示すように第１８′、８
″ との中間層としてボンデ乏グ材とセラミックスを
混合したものを溶射層１０．１０’として設けるとセラ
ミックスの密着がより安定する。セラミック溶射層には
プラズマで溶射すると通常５〜１９％位の空孔９〜９″
′ できるが、セラミック溶射層をより固定化するだ
めに、１００ｍ・μ以下に微粒子化させたセラミックス
をコロイド状に液に分散させ、その分散したセラミック
ス微粒子を空孔内９〜９″ に含浸させ、空孔内９〜
９″ を機密にし強固なセラミック溶射層を構成する。Furthermore, as shown in FIGS. 3 and 5,
If a thermal sprayed layer 10.10' containing a mixture of a bonding poor material and a ceramic is provided as an intermediate layer between the ceramic layer and the ceramic layer, the adhesion of the ceramic will be more stable. Hole 9~9″
' It is possible, but in order to make the ceramic sprayed layer more fixed, it is necessary to disperse ceramics finely divided into particles of 100 m/μ or less into a liquid in the form of a colloid, and impregnate the pores with the dispersed ceramic fine particles 9 to 9 inches deep. , inside the cavity 9~
9″ to form a strong ceramic sprayed layer.
空孔部９〜９″ の封孔処理は溶射便覧（日本溶射協
会編６７５ページ）に公表されている要領で行われる。The sealing treatment for the holes 9 to 9'' is carried out in accordance with the procedure published in the Thermal Spraying Handbook (edited by the Japan Thermal Spraying Association, p. 675).
通常、腐食性環境で使用する際に腐食液の浸透を防止す
るために、無機質のものとして水ガラス、硫酸バリウム
等が、まだ有機質のものとしてはベークライト溶液、ポ
リエチレン、フェス等が塗布されている。これらの封孔
処理剤は環境遮断が目的で溶射層の表面に塗布するだけ
で溶射層の強化処理としては使用されていない。まだ、
これらの封孔処理剤は全般に耐熱性が低く、１０００℃
以上の高温で使用するには不向きである。しかしながら
本発明では１０００℃以上の高温に耐えられる耐熱性を
有し、しかも硬さの固いセラミックスをｌｏｏｍμ以下
の微粒子にしたものを空孔部内９〜９″ に含浸させ
ることにより空孔部９〜９″′が強化できセラミック溶
射した被覆層をダストを含む高温ガスから保護できる。Usually, when used in a corrosive environment, in order to prevent the penetration of corrosive liquids, inorganic materials such as water glass and barium sulfate are coated, while organic materials such as Bakelite solution, polyethylene, and Fes are coated. . These sealing agents are merely applied to the surface of the thermally sprayed layer for the purpose of environmental protection, and are not used to strengthen the thermally sprayed layer. still,
These sealing agents generally have low heat resistance, and
It is unsuitable for use at higher temperatures. However, in the present invention, ceramics having heat resistance that can withstand high temperatures of 1000°C or higher and hardness is made into fine particles of loomμ or less and impregnated into the cavity 9 to 9''. 9'' can be strengthened and the ceramic sprayed coating layer can be protected from high-temperature gases containing dust.
（実施例） 本発明を図面に示す実施例をもって説明する。(Example) The present invention will be explained with reference to embodiments shown in the drawings.
第１図は転炉１の炉上に設置された廃ガス冷却装置でス
カート２、下部フード３、および上部フード４から構成
されている。これらの冷却装置は高温ガスの通過する際
の温度から耐熱性の不足をカバーするために管列からな
るフィンチューブで冷却する構造になっている。従来の
ものはこのフィンチューブが被覆されていなかっただめ
に摩耗による減肉、熱衝撃による割れ等の損傷が発生し
ていた。FIG. 1 shows a waste gas cooling device installed on the top of a converter 1, which is composed of a skirt 2, a lower hood 3, and an upper hood 4. These cooling devices have a structure in which cooling is performed using fin tubes consisting of tube rows in order to compensate for the lack of heat resistance due to the temperature at which high-temperature gas passes through. In conventional products, this fin tube was not coated, resulting in damage such as thinning due to wear and cracking due to thermal shock.
本発明はこれらの損傷を防止するために廃ガス通過側の
フィンチューブの表面をセラミックス８〜８″′ で溶
射被覆し、さらには空孔部内９〜９″をセラミック微粒
子で強化処理しているので、第１表に示すように溶射被
覆していないものに比べ、プラストエロージョンテスト
による摩耗量が大幅に減少する。In order to prevent these damages, the present invention thermally sprays the surface of the fin tube on the exhaust gas passage side with ceramics 8 to 8'' and further strengthens the inside of the cavity with ceramic fine particles. Therefore, as shown in Table 1, the amount of wear in the plasto erosion test is significantly reduced compared to those without thermal spray coating.
また高融点を有するセラミックスを溶射被覆してい乙の
で、フィンチューブの母材（金属材料）６〜６″′
を高温損傷から保護できる。したがって耐熱性のあるセ
ラミック溶射被覆のものは被覆のないＣ−５ｔｅｅｌ
あるいはＮｉ−Ｃｒ系の自溶性合金溶射被覆のものよ
り、溶鋼の付着量が少ない。さらにはフィンチューブの
母材６〜６″ と第１層目７〜７″′ の界面は自
溶性合金溶射のようにヒユーズ化していないのでヒート
ショックに対応でき割れが発生していない。In addition, since it is coated with ceramics having a high melting point by thermal spraying, the base material (metal material) of the fin tube is 6~6''
can be protected from high temperature damage. Therefore, the heat-resistant ceramic spray coating is C-5teel without coating.
Alternatively, the amount of molten steel deposited is smaller than that of a Ni-Cr-based self-fluxing alloy thermal spray coating. Furthermore, the interface between the base material 6 to 6'' of the fin tube and the first layer 7 to 7'' is not fused unlike in self-fusing alloy spraying, so it can withstand heat shock and no cracks occur.
（発明の効果）
以上のようにセラミックスを溶射被覆し、セラミックス
微粒子で強化処理したガス冷却器に関する本考案の効果
はつぎの通りである。(Effects of the Invention) The effects of the present invention regarding the gas cooler coated with ceramic by thermal spraying and reinforced with ceramic fine particles as described above are as follows.
（１）１０００℃以上の耐熱性のあるセラミックスを溶
射被覆しているので、管列からなる冷却器の廃ガス流体
側表面を高温の熱から保護できる。(1) Since it is coated with ceramics that is heat resistant to 1000° C. or higher, the exhaust gas fluid side surface of the cooler consisting of tube rows can be protected from high-temperature heat.
ｆ （２） また吹錬時のスプラッシュに
よる溶鋼が管表面に付着しない。f (2) Also, molten steel splashed during blowing does not adhere to the pipe surface.
（３） 金属に比ベセラミックスは硬く、摩耗しにく
いためにダストを含んだ廃ガスによる減肉が防止できる
。(3) Compared to metals, ceramics are harder and less prone to wear, which prevents wall thinning due to dust-containing waste gas.
（４） フィンチューブと第１層目との界面をヒユー
ズ化していないので急撤なヒートショックヲ受けても冷
却器表面に割れが発生しない。(4) Since the interface between the fin tube and the first layer is not fused, no cracks will occur on the surface of the cooler even if it is subjected to sudden heat shock.
（５） セラミック溶射Ｊ−の空孔部９〜９″′
を微粒子のセラミックスで強化処理しているので剥離し
にくい。(5) Ceramic sprayed J- hole 9~9'''
It is hard to peel off because it is reinforced with fine ceramic particles.
（６） これまでは琴耗、熱疲労等から耐久性が律速
されていたが、セラミックスを溶射被覆することにより
耐久性が著しく向上する。(6) Until now, durability has been limited by abrasion, thermal fatigue, etc., but by thermal spray coating with ceramics, durability is significantly improved.
以上の通り本考案は転炉用廃ガス冷却器として実用上き
わめて有用なものである。As described above, the present invention is extremely useful in practice as a waste gas cooler for converters.
第１図は転炉用廃ガス冷却装置の構造を示す説明図、第
２図から第５図までは本発明の実施例の概略説明図であ
る。
１・・・転炉 ２・・・スカート３・・・
下部フード ４・・・上部フード５・・・集塵器
６．６′、６′：６″′・・・フィンチューブ７、７１
．７：Ｊ ｆ ・・・ボンディング溶射層Ｂ、 Ｂ：
ＢＪ−ＢＨＪ ・・セラミック溶射層ｇ、 ｇ：
ｇＪ： ｇＪＨ・・・強化処理層１０、’１．０’
・・ハーフボンディング溶射層１１．１１１１１″、
１１″・・・溶接部代理人 弁理士 吉 島
寧第１図
第２図 第３図
第５図FIG. 1 is an explanatory diagram showing the structure of a converter waste gas cooling device, and FIGS. 2 to 5 are schematic explanatory diagrams of embodiments of the present invention. 1... Converter 2... Skirt 3...
Lower hood 4... Upper hood 5... Dust collector 6.6', 6': 6'''... Fin tube 7, 71
．． 7: J f ... Bonding sprayed layer B, B:
BJ-BHJ...Ceramic sprayed layer g, g:
gJ: gJH... Reinforcement treatment layer 10, '1.0'
・・Half bonding thermal spray layer 11.11111″,
11″...Welding Department Agent Patent Attorney Yoshijima
Figure 1 Figure 2 Figure 3 Figure 5
Claims (2)
Ｎｉ−Ａｌ等のボンディング用金属溶射層となし、その
金属溶射層の上をセラミック溶射層としたことを特徴と
する転炉用廃ガス冷却器。(1) For a converter, characterized in that part or all of the exhaust gas fluid side surface of the cooler is coated with a bonding metal sprayed layer such as Ni-Al, and a ceramic sprayed layer is placed on top of the metal sprayed layer. Waste gas cooler.
Ｎｉ−Ａｌ等のボンディング用金属溶射層となし、その
上にセラミックスと金属を混合したハーフボンディング
溶射層となし、さらにそのハーフボンディング溶射層の
上をセラミック溶射層としたことを特徴とする転炉用廃
ガス冷却器。(2) Part or all of the exhaust gas fluid side surface of the cooler is coated with a metal sprayed layer for bonding such as Ni-Al, and on top of that is a half-bonding sprayed layer made of a mixture of ceramics and metal, and then the half-bonding layer is formed. A waste gas cooler for a converter, characterized by having a ceramic sprayed layer on top of the sprayed layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59120720A JPS61512A (en) | 1984-06-14 | 1984-06-14 | Waste gas cooler for converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59120720A JPS61512A (en) | 1984-06-14 | 1984-06-14 | Waste gas cooler for converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61512A true JPS61512A (en) | 1986-01-06 |
Family
ID=14793327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59120720A Pending JPS61512A (en) | 1984-06-14 | 1984-06-14 | Waste gas cooler for converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61512A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020062726A1 (en) * | 2018-09-29 | 2020-04-02 | 华北电力大学 | Membrane type water-cooled wall having anti-abrasion heated surface and preparation method therefor |
-
1984
- 1984-06-14 JP JP59120720A patent/JPS61512A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020062726A1 (en) * | 2018-09-29 | 2020-04-02 | 华北电力大学 | Membrane type water-cooled wall having anti-abrasion heated surface and preparation method therefor |
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