JPH08233478A - Protective member for fluidized-bed boiler heat transfer tube - Google Patents
Protective member for fluidized-bed boiler heat transfer tubeInfo
- Publication number
- JPH08233478A JPH08233478A JP3662095A JP3662095A JPH08233478A JP H08233478 A JPH08233478 A JP H08233478A JP 3662095 A JP3662095 A JP 3662095A JP 3662095 A JP3662095 A JP 3662095A JP H08233478 A JPH08233478 A JP H08233478A
- Authority
- JP
- Japan
- Prior art keywords
- base material
- heat transfer
- transfer tube
- protective member
- iron
- 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.)
- Withdrawn
Links
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、伝熱管の減肉防止のた
めに使用される流動床ボイラ伝熱管の保護部材に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective member for a fluidized-bed boiler heat transfer tube used to prevent thinning of the heat transfer tube.
【０００２】[0002]
【従来の技術】流動床ボイラ伝熱管は、使用環境が厳し
く、高温腐食や酸化物粉末による摩耗によって著しい減
肉を生じ、長期に渡って使用することができないため、
従来から図２に示すようにこれを保護するための保護部
材が用いられている。図２に示す従来の保護部材０２
は、ステンレス鋼や耐熱鋳鋼が用いられており、溶接部
４が設けられてボイラ伝熱管１に取付けられていた。2. Description of the Related Art A fluidized bed boiler heat transfer tube is used in a severe environment and suffers from a significant thickness reduction due to high temperature corrosion and wear due to oxide powder, and cannot be used for a long period of time.
Conventionally, as shown in FIG. 2, a protective member for protecting this has been used. The conventional protection member 02 shown in FIG.
Is made of stainless steel or heat-resistant cast steel, and the welding portion 4 is provided and attached to the boiler heat transfer tube 1.
【０００３】[0003]
【発明が解決しようとする課題】従来の流動床ボイラ伝
熱管の保護部材においては、前記のようにステンレス鋼
や耐熱鋳鋼が用いられていたが、伝熱管と同様容易に減
肉を生じ、本来目的とした高温部材の保護が十分に行え
ず、対策が望まれていた。In the conventional member for protecting the heat transfer tube of the fluidized bed boiler, the stainless steel or the heat-resistant cast steel was used as described above. Since the intended protection of the high temperature member cannot be performed sufficiently, a countermeasure has been desired.
【０００４】この保護部材の耐食及び耐酸化性を向上さ
せる方法としては、表面にＡｌあるいはＣｒ拡散被覆を
形成し、これを使用環境中でＡｌ2 Ｏ3 あるいはＣｒ2
Ｏ3の酸化膜化させ、耐食，耐酸化性を付与することが
一般に考えられるが、この種拡散被覆は、その厚さが十
分ではなく、長時間の使用に耐え得るものとすることは
困難である。As a method for improving the corrosion resistance and the oxidation resistance of this protective member, an Al or Cr diffusion coating is formed on the surface and Al 2 O 3 or Cr 2 is used in the working environment.
It is generally considered that O 3 is converted into an oxide film to impart corrosion resistance and oxidation resistance, but this kind of diffusion coating is not sufficiently thick and it is difficult to make it durable for long-term use. Is.
【０００５】なお、耐酸化性、耐食性及び高温での耐摩
耗性にすぐれた材料としては、シリコン系セラミックス
が挙げられるが、セラミックス系材料は一般に高価で、
かつ、加工が容易でないため、特に保護部材のように複
雑形状のものを製造する場合には著しくコスト高にな
り、実用化はむずかしかった。As a material excellent in oxidation resistance, corrosion resistance, and wear resistance at high temperatures, silicon-based ceramics can be cited, but ceramic-based materials are generally expensive and
In addition, since the processing is not easy, the cost is remarkably high, especially when a protective member having a complicated shape is manufactured, and it is difficult to put it into practical use.
【０００６】本発明は、上記課題を解決するため、厳し
い使用条件に耐えることができるセラミックス系材料と
同等の特性を有し、かつ、加工性が良好で、コスト的に
も問題のない金属系保護部材を提供しようとするもので
ある。In order to solve the above-mentioned problems, the present invention has the same characteristics as a ceramic material capable of withstanding severe usage conditions, has good workability, and has no cost problem. It is intended to provide a protection member.
【０００７】[0007]
（１）本発明の流動床ボイラ伝熱管の保護部材は、鉄
（以下Ｆｅとする）を主成分とし、これに３４〜４８原
子％（２０〜３２重量％）のアルミニウム（以下Ａｌと
する）を加えたＦｅ−Ａｌ二元合金を基材として形成さ
れたことを特徴としている。(1) The protective member of the fluidized bed boiler heat transfer tube of the present invention contains iron (hereinafter, Fe) as a main component, and 34 to 48 atomic% (20 to 32% by weight) of aluminum (hereinafter, Al). It is characterized in that it is formed by using a Fe-Al binary alloy added with.
【０００８】（２）本発明は、上記発明（１）に記載の
流動床ボイラ伝熱管の保護部材において、Ｆｅ及びＡｌ
にボロン（以下Ｂとする）が添加されて基材が形成され
たことを特徴としている。(2) The present invention provides a protective member for a fluidized bed boiler heat transfer tube as set forth in the above invention (1), wherein Fe and Al are used.
It is characterized in that boron (hereinafter referred to as B) is added to the substrate to form a base material.
【０００９】[0009]
【作用】上記発明（１）において、基材はＡｌ濃度が３
４〜４８原子％であり、Ｂ２型金属間化合物単相である
ため、Ａｌ2 Ｏ3 が長期間安定に形成され、材質的には
酸化物系セラミックスに類似しているため、高温での耐
酸化性、耐食性、耐摩耗性が要求される使用条件におい
ても、伝熱管を完全に保護し、減肉の防止が可能とな
る。In the above invention (1), the substrate has an Al concentration of 3
Since it is 4 to 48 atomic% and is a B2 type intermetallic compound single phase, Al 2 O 3 is stably formed for a long period of time, and because it is similar to oxide ceramics in terms of material, it has acid resistance at high temperature. Even under use conditions that require chemical resistance, corrosion resistance, and wear resistance, it is possible to completely protect the heat transfer tube and prevent wall thinning.
【００１０】上記発明（２）においては、ＦｅとＡｌに
粒界強化元素であるＢが添加されて基材が形成されてい
るため、基材の延性が改善され、加工性の向上、使用中
の熱ひずみに対する耐力の向上が可能となる。In the above invention (2), since the base material is formed by adding B, which is a grain boundary strengthening element, to Fe and Al, the ductility of the base material is improved, the workability is improved, and during use. It is possible to improve the proof stress against heat strain of.
【００１１】[0011]
【実施例】本発明の一実施例に係る流動床ボイラ伝熱管
の保護部材について、図１により説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A protective member for a fluidized bed boiler heat transfer tube according to an embodiment of the present invention will be described with reference to FIG.
【００１２】図１に示す本実施例に係る保護部材２は、
Ｆｅ−２４．４重量％Ａｌ−０．０２４重量％Ｂ合金が
基材として用いられたものであり、精密鋳造法により伝
熱管１を完全に覆う形状に製造し、１０００℃×２ｈｒ
炉冷の熱処理を実施した後に機械加工を施し、ボイラ組
立後にボルト３により伝熱管１に装着される。The protective member 2 according to this embodiment shown in FIG.
Fe-24.4 wt% Al-0.024 wt% B alloy was used as a base material, and was manufactured by a precision casting method into a shape that completely covers the heat transfer tube 1, and 1000 ° C. × 2 hr.
After heat treatment for furnace cooling is performed, machining is performed, and after the boiler is assembled, it is attached to the heat transfer tube 1 by the bolt 3.
【００１３】上記において、保護部材２の表面には、基
材に含まれるＡｌの選択酸化によりＡｌ2 Ｏ3 が酸化膜
として生成されるが、基材がＢ２型金属間化合物単相
（Ａｌ濃度；３４〜４８原子％）であるため、表面にＡ
ｌあるいはＣｒ拡散被覆を形成し、これを使用環境中で
酸化膜化させるものとは異なり、Ａｌ2 Ｏ3 が長時間安
定に形成されている。In the above, Al 2 O 3 is generated as an oxide film on the surface of the protective member 2 by selective oxidation of Al contained in the base material. However, the base material is a B2 type intermetallic compound single phase (Al concentration). 34 to 48 atomic%), and therefore A on the surface
Unlike the case where a 1 or Cr diffusion coating is formed and is made into an oxide film in a use environment, Al 2 O 3 is stably formed for a long time.
【００１４】これは、材質的には酸化物系セラミックス
と類似したものであり、酸化、腐食及び摩耗を生じやす
い使用条件下においても伝熱管１を完全に保護し、減肉
を生じさせないように作用する。This is similar to oxide ceramics in terms of material, and protects the heat transfer tube 1 completely even under use conditions where oxidation, corrosion and wear are likely to occur, and prevents wall loss. To work.
【００１５】また、若干のＢの添加は、これが粒界強化
元素であるため、基材の延性を改善することができ、加
工性が改善され、使用中の熱ひずみに対する耐力の向上
を可能とする。Further, the addition of a small amount of B can improve the ductility of the base material because it is a grain boundary strengthening element, the workability is improved, and the proof stress against thermal strain during use can be improved. To do.
【００１６】上記保護部材２は、基材が所定の形状に加
工された後、ボルト３により伝熱管１に装着されてお
り、従来の溶接によるものと異なるが、これは基材に用
いられる上記合金が従来の保護部材に用いていた材料よ
りももろさが増し、破壊されやすいことから、これを防
ぐためである。The protective member 2 is mounted on the heat transfer tube 1 with the bolts 3 after the base material is processed into a predetermined shape, which is different from the conventional welding, which is used for the base material. This is because the brittleness of the alloy is higher than that of the material used for the conventional protection member and the alloy is easily broken, so that this is prevented.
【００１７】本実施例の保護部材２については、その耐
久性を確認するため、実機における１年間の使用実験を
行ったところ、保護部材２については酸化、腐食及び摩
耗によるわずかな減肉を生じたが、伝熱管１では全く減
肉を生じなかった。In order to confirm the durability of the protective member 2 of this embodiment, a one-year use experiment was conducted in an actual machine. As a result, the protective member 2 was slightly thinned due to oxidation, corrosion and abrasion. However, the heat transfer tube 1 did not cause metal loss at all.
【００１８】[0018]
【発明の効果】本発明の流動床ボイラ伝熱管の保護部材
は、Ｆｅに３４〜４８原子％のＡｌを加え、更に若干の
Ｂを添加して基材が形成されたことによって、ＦｅとＡ
ｌによりＢ２型金属間化合物単相の基材が形成されて長
期安定な金属が得られ、Ｂの添加により基材の延性が改
善されるため、高温での耐酸化性、耐食性、耐摩耗性が
要求される使用環境においても伝熱管を完全に保護し、
その減肉を防止することができる保護部材を実現するEFFECTS OF THE INVENTION The protective member for the fluidized-bed boiler heat transfer tube of the present invention is formed by adding 34 to 48 atomic% of Al to Fe and further adding a small amount of B to form the base material.
l forms a B2-type intermetallic compound single-phase base material to obtain a stable metal for a long period of time, and the addition of B improves the ductility of the base material, so oxidation resistance at high temperatures, corrosion resistance, and wear resistance Completely protects the heat transfer tubes even in the usage environment where
Realize a protective member that can prevent the thickness reduction
【図１】本発明の一実施例に係る保護部材の説明図であ
る。FIG. 1 is an explanatory diagram of a protective member according to an embodiment of the present invention.
【図２】従来の保護部材の説明図である。FIG. 2 is an explanatory view of a conventional protection member.
１ 伝熱管 ２ 保護部材 ３ ボルト ４ 溶接部 1 Heat transfer tube 2 Protective member 3 Bolt 4 Welded part
Claims (2)
％（２０〜３２重量％）のアルミニウムを加えた鉄−ア
ルミニウム二元合金を基材として形成されたことを特徴
とする流動床ボイラ伝熱管の保護部材。1. A fluidized bed comprising iron as a main component and an iron-aluminum binary alloy containing 34 to 48 atomic% (20 to 32% by weight) of aluminum as a base material. Boiler heat transfer tube protection member.
保護部材において、鉄及びアルミニウムにボロンが添加
されて基材が形成されたことを特徴とする流動床ボイラ
伝熱管の保護部材。2. The protection member for a fluidized bed boiler heat transfer tube according to claim 1, wherein boron and boron are added to iron and aluminum to form a base material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3662095A JPH08233478A (en) | 1995-02-24 | 1995-02-24 | Protective member for fluidized-bed boiler heat transfer tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3662095A JPH08233478A (en) | 1995-02-24 | 1995-02-24 | Protective member for fluidized-bed boiler heat transfer tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08233478A true JPH08233478A (en) | 1996-09-13 |
Family
ID=12474855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3662095A Withdrawn JPH08233478A (en) | 1995-02-24 | 1995-02-24 | Protective member for fluidized-bed boiler heat transfer tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08233478A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007292308A (en) * | 2006-03-27 | 2007-11-08 | Mitsubishi Rayon Co Ltd | Protective member and manufacturing method |
-
1995
- 1995-02-24 JP JP3662095A patent/JPH08233478A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007292308A (en) * | 2006-03-27 | 2007-11-08 | Mitsubishi Rayon Co Ltd | Protective member and manufacturing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20020507 |