JPH04131697U - Non-cooled smelt spout - Google Patents
Non-cooled smelt spoutInfo
- Publication number
- JPH04131697U JPH04131697U JP3486591U JP3486591U JPH04131697U JP H04131697 U JPH04131697 U JP H04131697U JP 3486591 U JP3486591 U JP 3486591U JP 3486591 U JP3486591 U JP 3486591U JP H04131697 U JPH04131697 U JP H04131697U
- Authority
- JP
- Japan
- Prior art keywords
- smelt
- smelt spout
- spout
- corrosion
- cooled
- 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
- 241001062472 Stokellia anisodon Species 0.000 title claims abstract description 47
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 239000000919 ceramic Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 7
- 238000011084 recovery Methods 0.000 abstract description 7
- 230000007797 corrosion Effects 0.000 description 18
- 238000005260 corrosion Methods 0.000 description 18
- 239000000498 cooling water Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Paper (AREA)
Abstract
(57)【要約】
【目的】 ソーダ回収ボイラのスメルトスパウトに関す
る。
【構成】 Ｃｒ：４０〜５０wt％、Ａｌ：１〜３wt％、
Ｎｉ残部の組成からなるスメルトスパウト本体のスメル
ト接触表面にセラミックスブロックを被覆してなる無冷
却スメルトスパウト。
(57) [Summary] [Purpose] Regarding smelt spouts for soda recovery boilers. [Composition] Cr: 40-50wt%, Al: 1-3wt%,
A non-cooled smelt spout comprising a ceramic block coated on the smelt contact surface of the smelt spout body, which has a composition of Ni remaining.
Description
【０００１】0001
本考案はソーダ回収ボイラのスメルトスパウトに関する。 The present invention relates to a smelt spout for a soda recovery boiler.
【０００２】0002
製紙工程におけるソーダ回収工程を図２によって説明する。木材チップａは木 釜ｂにて処理された後、洗浄ｃし、精製ｄ、抄紙ｅ工程に送られる。この洗浄ｃ 工程で生じる使用済薬品（黒液ｆ）はソーダ回収ボイラｇにて処理再生される。 ソーダ回収ボイラｇで処理された薬品はスメルトｈと呼ばれ、約８５０℃の高温 溶融状態で腐食性の極めて高い物質である。 The soda recovery process in the paper manufacturing process will be explained with reference to FIG. wood chip a is wood After being processed in pot b, it is washed c, purified d, and sent to papermaking process e. This cleaning c The used chemicals (black liquor f) generated in the process are processed and recycled in the soda recovery boiler g. The chemical treated in soda recovery boiler g is called smelt h, and is heated to a high temperature of approximately 850℃. It is an extremely corrosive substance in its molten state.
【０００３】 このスメルトｈは図３に示す流路にて炉外に放出されるが、このスメルト流路 部位をスメルトスパウトｉという。なお、ｇ′はソーダ回収ボイラｇの炉壁であ る。0003 This smelt h is discharged outside the furnace through the flow path shown in FIG. The part is called smelt spout i. Note that g′ is the furnace wall of soda recovery boiler g. Ru.
【０００４】 従来スメルトスパウトｉは図４に示す構造をもつ。すなわち、炭素鋼又は低合 金鋼あるいはそれらに１８Ｃｒ系材の肉盛溶接を行ったものが使用され、冷却水 ｋによりメタル温度を低く保っているにもかかわらず、スメルトｈの高い腐食性 のため１〜２年程度の寿命しかなかった。また、スメルトｈが冷却により流路面 に固着し易く、スメルト流路確保のため、頻繁に手入れが必要であった。更に腐 食により冷却水ｋが漏洩した場合、水蒸気爆発を起こすこともあった。なお、図 ４中、ｌは冷却水入口管、ｍは冷却水出口管を示す。0004 The conventional smelt spout i has the structure shown in FIG. i.e. carbon steel or low alloy Gold steel or overlay welded with 18Cr material is used, and cooling water is used. Although the metal temperature is kept low by k, the high corrosivity of smelt h Therefore, their lifespan was only about 1 to 2 years. In addition, the smelt h cools down on the flow path surface. The smelt easily adhered to the smelt, and frequent maintenance was required to secure the smelt flow path. Even more rotten If cooling water leaked due to an eclipse, a steam explosion could occur. In addition, the figure 4, l indicates a cooling water inlet pipe, and m indicates a cooling water outlet pipe.
【０００５】[0005]
従来技術の問題点は以下の３項目に集約できる。 （１）水冷式であるため、冷却水の循環装置が必要、（２）水冷式であるため 、スメルト凝固によりスメルト流路の閉塞が頻繁に発生、（３）使用材質が低級 なため、耐食性が低く、短寿命（水蒸気爆発の危険有） Problems with the conventional technology can be summarized into the following three items. (1) Because it is water-cooled, a cooling water circulation device is required. (2) Because it is water-cooled, , frequent blockage of the smelt flow path due to smelt solidification, (3) low-grade materials used. Therefore, corrosion resistance is low and lifespan is short (risk of steam explosion)
【０００６】 以上の項目について、その原因と対策を挙げると、（１）はコスト上の問題で あり、冷却水の循環装置が不必要な無冷却式とする他はない。（２）については スメルト融点が５５０〜６５０℃程度であり固着、閉塞を回避するにはスメルト 流路面温度をスメルト融点以上とする必要がある。（３）はメタル温度に応じて 高紙材料を使用する必要がある。[0006] Listing the causes and countermeasures for the above items, (1) is a cost issue. There is no other choice but to use a non-cooling type, which does not require a cooling water circulation system. Regarding (2) The melting point of smelt is about 550 to 650℃, and in order to avoid sticking and clogging, smelt The flow path surface temperature must be higher than the smelt melting point. (3) depends on the metal temperature. It is necessary to use high paper material.
【０００７】 なお従来スメルトスパウトの腐食事例から、スメルトスパウトｉの腐食は図５ に示すように、スメルトｈ流れの境界域ｎで主に生じることが確認されている。 この現象は腐食生成物をスメルト流れが剥ぎ取ることにより次々に腐食が進行す る、いわゆるエロージョン・コロージョンが発生していることを示唆している。[0007] In addition, from the corrosion examples of conventional smelt spouts, the corrosion of smelt spout i is shown in Figure 5. As shown in , it has been confirmed that this occurs mainly in the boundary area n of the smelt h flow. This phenomenon occurs when the smelt flow strips away corrosion products, causing corrosion to progress one after another. This suggests that so-called erosion/corrosion is occurring.
【０００８】[0008]
本考案はＣｒ：４０〜５０wt％、Ａｌ：１〜３wt％、Ｎｉ残部の組成からなる スメルトスパウト本体のスメルト接触表面にセラミックスブロックを被覆してな ることを特徴とする無冷却式スメルトスパウトである。 The composition of the present invention is Cr: 40-50 wt%, Al: 1-3 wt%, and the remainder Ni. The smelt contact surface of the smelt spout body is coated with a ceramic block. This is a non-cooled smelt spout.
【０００９】 すなわち、本考案は前述の問題点を解決するため、スメルトスパウトを空冷式 としたものである。このため、スメルト接触面は８００℃以上の高温となり、ス メルトの腐食性は一段と高まり厳しい腐食環境となるので、この環境中で十分な 耐食性を有する合金の調査を行ったところ、表１に示すように４０〜５０wt％Ｃ ｒ、１〜３wt％Ａｌ、残部Ｎｉの組成であれば要求を満足することが判明した。[0009] In other words, the present invention aims to solve the above-mentioned problems by using an air-cooled smelt spout. That is. As a result, the smelt contact surface reaches a high temperature of 800°C or more, The corrosivity of the melt increases further, creating a severe corrosive environment, so When investigating alloys with corrosion resistance, as shown in Table 1, 40 to 50 wt% C It has been found that a composition of 1 to 3 wt% Al and the balance Ni satisfies the requirements.
【００１０】 また、従来の腐食が前述のエロージョン・コロージョンにより進行しているこ とから、この対策として８５０℃スメルト中で十分な耐食性を示し、かつ硬度の 大きいアルミナ（表２参照）でスメルト接触面を被覆することにより解決した。0010 Additionally, conventional corrosion is progressing due to the erosion/corrosion mentioned above. Therefore, as a countermeasure to this problem, we have shown sufficient corrosion resistance in 850℃ smelt and have a hardness of The solution was to coat the smelt contact surfaces with large alumina (see Table 2).
【００１１】 なお、アルミナは熱応力あるいは熱衝撃により破壊しやすいためブロック状と し、それらによる応力を緩和した。[0011] Note that alumina is easily destroyed by thermal stress or thermal shock, so it is not made in block form. and alleviated the stress caused by them.
【表１】 表 １ 条件：実機の既存のスメルトスパウトに、幅１５mm×長さ２０ mmの上記試験片をアーク溶接にて仮り付けし、７８０℃ で２０００時間の実缶試験を行った。[Table 1] Table 1 Conditions: The above test piece with a width of 15 mm and a length of 20 mm was temporarily attached to the existing smelt spout of an actual machine by arc welding, and an actual can test was conducted at 780°C for 2000 hours.
【表２】 表 ２ （試験条件は表１と同一条件）[Table 2] Table 2 (Test conditions are the same as Table 1)
【００１２】0012
耐食性向上及びエロージョン・コロージョン対策として用いる４０〜５０wt％ Ｃｒ、Ａｌ １〜３wt％、Ｎｉ残部の組成を有する材料は、腐食を受けることに より表面に腐食に対して保護性を有するＣｒ2 Ｏ3 皮膜を形成する。この皮膜は アルミナブロックが脱落した際にも、エロージョン・コロージョンに対して有効 なＡｌ2 Ｏ3 保護性皮膜を形成する。このＣｒ2 Ｏ3 保護性皮膜は腐食性の元素 である酸素・硫黄等の侵入（拡散）に対する防護膜として作用するため合金の耐 食性を著しく向上させる。Materials with a composition of 40 to 50 wt% Cr, 1 to 3 wt% Al, and the balance Ni, which are used to improve corrosion resistance and prevent erosion/corrosion, form a Cr 2 O 3 film on the surface that has corrosion protection when subjected to corrosion. form. This film forms an Al 2 O 3 protective film that is effective against erosion and corrosion even when the alumina block falls off. This Cr 2 O 3 protective film acts as a protective film against the intrusion (diffusion) of corrosive elements such as oxygen and sulfur, thereby significantly improving the corrosion resistance of the alloy.
【００１３】 一方、Ａｌ2 Ｏ3 保護性皮膜及び本来のエロージョン・コロージョン対策とし て使用するアルミナは硬度が大きく粒子等の衝突や摩耗に対して欠損が少なく、 かつ化学的に安定であるため反応による変質が少ない。[0013] On the other hand, alumina, which is used as an Al 2 O 3 protective film and as an original erosion/corrosion countermeasure, has a high hardness and is less susceptible to damage due to particle collisions and abrasion, and is chemically stable, so it is less susceptible to reactions. Less deterioration.
【００１４】 なお、Ａｌ2 Ｏ3 保護性皮膜はブロック状にスメルトスパウト本体に被覆する ことにより、図６に示すように、温度差によりＡｌ2 Ｏ3 保護性が剥がれること がなく、図７に示すように個々のブロック隙間によって応力を緩和するため剥が れたり、破壊することがない。By coating the Al 2 O 3 protective film on the smelt spout body in the form of a block, the Al 2 O 3 protective film does not peel off due to temperature differences, as shown in FIG. As shown, the gaps between the individual blocks relieve stress, so they do not peel off or break.
【００１５】[0015]
本考案の一実施例を図１によって説明する。図１において、１は４０wt％Ｃｒ 、３wt％Ａｌ、残部Ｎｉで鋳込まれたスメルトスパウト本体であり、２はアルミ ナブロックで、スメルトスパウト本体１に固定されている。 An embodiment of the present invention will be described with reference to FIG. In Figure 1, 1 is 40wt%Cr , is a smelt spout body cast with 3wt% Al and the balance Ni, and 2 is aluminum. It is fixed to the smelt spout main body 1 with a nub block.
【００１６】[0016]
本考案の効果として以下が挙げられる。 （１）無冷却式採用により冷却水循環装置が不要となる。 （２）無冷却式採用により水蒸気爆発の不安がなくなる。 （３）無冷却式採用によりスメルト接触面の温度が上昇しスメルト固着がなくな る。（流路確保の作用が不要となる） The effects of this invention include the following. (1) No cooling water circulation device is required due to the non-cooled type. (2) Uncooled type eliminates concerns about steam explosion. (3) Adopting a non-cooling system increases the temperature of the smelt contact surface and eliminates smelt sticking. Ru. (No need to act to secure the flow path)
【図１】本考案無冷却式スメルトスパウトの一実施例の
説明図。FIG. 1 is an explanatory diagram of an embodiment of the non-cooled smelt spout of the present invention.
【図２】製紙工程におけるソーダ回収工程の説明図。FIG. 2 is an explanatory diagram of the soda recovery process in the paper manufacturing process.
【図３】従来のスメルトスパウトの一態様の説明図。FIG. 3 is an explanatory diagram of one aspect of a conventional smelt spout.
【図４】従来の水冷式スメルトスパウトの一態様の説明
図。FIG. 4 is an explanatory diagram of one aspect of a conventional water-cooled smelt spout.
【図５】従来のスメルトスパウトの腐食発生位置の説明
図。FIG. 5 is an explanatory diagram of locations where corrosion occurs in a conventional smelt spout.
【図６】スメルトスパウト内外面の温度差による変形の
説明図。FIG. 6 is an explanatory diagram of deformation due to temperature difference between the inner and outer surfaces of the smelt spout.
【図７】本考案スメルトスパウトにおけるセラミックス
ブロックの応力緩和の説明図。FIG. 7 is an explanatory diagram of stress relaxation of the ceramic block in the smelt spout of the present invention.
１ スメルトスパウト本体 ２ アルミナブロック 1 Smelt spout body 2 Alumina block
フロントページの続き (72)考案者 西尾 敏明 長崎市飽の浦町１番１号 三菱重工業株式 会社長崎研究所内Continuation of front page (72) Creator Toshiaki Nishio 1-1 Akunoura-cho, Nagasaki City Mitsubishi Heavy Industries Co., Ltd. Inside the company's Nagasaki Research Institute
Claims (1)
％、Ｎｉ残部の組成からなるスメルトスパウト本体のス
メルト接触表面にセラミックスブロックを被覆してなる
ことを特徴とする無冷却式スメルトスパウト。[Claim 1] Cr: 40 to 50 wt%, Al: 1 to 3 wt%
A non-cooling type smelt spout, characterized in that the smelt contact surface of the smelt spout body, which has a composition of % and the remainder is Ni, is coated with a ceramic block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3486591U JPH04131697U (en) | 1991-05-17 | 1991-05-17 | Non-cooled smelt spout |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3486591U JPH04131697U (en) | 1991-05-17 | 1991-05-17 | Non-cooled smelt spout |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04131697U true JPH04131697U (en) | 1992-12-03 |
Family
ID=31917164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3486591U Pending JPH04131697U (en) | 1991-05-17 | 1991-05-17 | Non-cooled smelt spout |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04131697U (en) |
-
1991
- 1991-05-17 JP JP3486591U patent/JPH04131697U/en active Pending
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