JPH07280202A - Superheater in boiler - Google Patents
Superheater in boilerInfo
- Publication number
- JPH07280202A JPH07280202A JP8532794A JP8532794A JPH07280202A JP H07280202 A JPH07280202 A JP H07280202A JP 8532794 A JP8532794 A JP 8532794A JP 8532794 A JP8532794 A JP 8532794A JP H07280202 A JPH07280202 A JP H07280202A
- Authority
- JP
- Japan
- Prior art keywords
- superheater
- boiler
- corrosion
- fluidized bed
- tube
- 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
Landscapes
- Incineration Of Waste (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は廃棄物焼却ボイラ−にお
ける過熱器及び流動床ボイラ−における過熱器に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superheater for a waste incineration boiler and a superheater for a fluidized bed boiler.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】廃棄物
焼却ボイラ−では多量の熱が発生するので、焼却炉では
廃熱ボイラ−を設置して燃焼ガスから熱回収を行なうこ
とが一般に行なわれている。その燃焼ガスには多量の煤
塵が含まれており、これらの煤塵はボイラ−の水管に付
着して管の熱伝導を阻害し、管内を流れる水の蒸気化効
率を低下させる。このため廃熱ボイラ−にはス−トブロ
−装置を設置して水管に付着した煤塵をスチ−ム噴射で
除去する必要が生ずる。2. Description of the Related Art Since a large amount of heat is generated in a waste incineration boiler, it is common to install a waste heat boiler in an incinerator to recover heat from combustion gas. ing. The combustion gas contains a large amount of soot and dust, and these soot and dust adhere to the water pipes of the boiler to hinder the heat conduction of the pipes, and reduce the vaporization efficiency of water flowing in the pipes. Therefore, it is necessary to install a soot blower device in the waste heat boiler to remove the soot dust adhering to the water pipe by steam injection.
【０００３】しかしながら、処理する廃棄物中に塩化ビ
ニル樹脂のように有機塩素化合物が含まれているとき
は、燃焼ガス中に塩化水素ガスが含まれる。燃焼ガス中
の塩化水素ガス量は1000 ppm以上、場合によっては6000
ppm乃至はそれ以上にも及ぶ。また焼却物中に金属又は
金属化合物が存在するときは煤塵中に金属塩化物が混在
してくる。これら塩化水素、金属塩化物によってボイラ
−の管は著しく腐食される。However, when the waste to be treated contains an organic chlorine compound such as vinyl chloride resin, hydrogen chloride gas is contained in the combustion gas. The amount of hydrogen chloride gas in the combustion gas is 1000 ppm or more, and in some cases 6000
ppm to even higher. When a metal or a metal compound is present in the incinerated material, metal chloride is mixed in the soot dust. These hydrogen chloride and metal chlorides significantly corrode the boiler tube.
【０００４】上記のような問題点を解消するために、本
発明の発明者の一部のものは、さきに、スチ−ムによる
ス−トブロ−装置を有する塵芥焼却炉の廃熱ボイラ−の
水管の表面に耐食性の金属溶射層を形成させてなる廃熱
ボイラ−の発明を完成した (特開平5-164319号公報) 。
この公報に示される発明は、特に塩化ビニル樹脂廃棄物
を焼却処分するのに好適な廃熱ボイラ−に係わるもので
あって、焼却炉のボイラ−蒸発管 (表面温度300 ℃前
後) の腐食、摩耗を防ぐため、ス−トブロ−装置に隣接
する蒸発管の表面に耐食性の金属溶射層を形成させてお
き、ス−トブロ−装置に用いる蒸気としては、この廃熱
ボイラ−で発生した中圧蒸気 (具体的には13 kg ／c
m2 、200 ℃の蒸気が挙げられる)を用い上記目的を達成
するものである。しかしながら、この廃熱ボイラ−より
も更にエネルギ−の回収効率を向上させることが望まれ
る。更に流動床ボイラ−における過熱器においても同様
の問題があり、同様にエネルギ−の回収効率を向上させ
ることが望まれている。In order to solve the above-mentioned problems, some of the inventors of the present invention have previously proposed a waste heat boiler for a refuse incinerator having a steam blower device. The invention of a waste heat boiler in which a corrosion-resistant metal sprayed layer is formed on the surface of a water pipe has been completed (Japanese Patent Laid-Open No. 5-164319).
The invention disclosed in this publication relates to a waste heat boiler particularly suitable for incineration of vinyl chloride resin waste, in which the boiler of an incinerator-evaporation pipe (surface temperature around 300 ° C) is corroded, In order to prevent abrasion, a corrosion-resistant metal sprayed layer is formed on the surface of the evaporation pipe adjacent to the soot blower, and the steam used in the soot blower is the medium pressure generated in this waste heat boiler. Steam (specifically 13 kg / c
m 2 and steam at 200 ° C. are used) to achieve the above object. However, it is desired to further improve the energy recovery efficiency as compared with this waste heat boiler. Further, there is a similar problem in the superheater in the fluidized bed boiler, and it is also desired to improve the energy recovery efficiency.
【０００５】[0005]
【課題を解決するための手段】本発明は上記エネルギ−
の回収効率の向上という要望に応えるものであり、廃棄
物焼却ボイラ−に付設する過熱器の効率を上げ、例えば
発電にも利用できる高温高圧蒸気 (例えば60 kg ／c
m2 、400 ℃) の発生を可能とするものであり、その発
明の要旨とするところは、廃棄物焼却ボイラ−で発生し
た水蒸気を過熱する過熱器における過熱管の表面又は流
動床ボイラ−における接触過熱器又は層内過熱器の過熱
管の表面が耐食性の金属溶射層で被覆されていることを
特徴とするボイラ−における過熱器に存する。The present invention provides the above-mentioned energy.
In order to improve the efficiency of recovery of wastewater, the efficiency of the superheater attached to the waste incineration boiler is increased, and for example, high-temperature high-pressure steam that can also be used for power generation (for example, 60 kg / c
is intended to enable the generation of m 2, 400 ° C.), has as subject matter of the invention, waste incineration boilers - in - the surface of the superheated tube in the superheater to superheat the generated steam at or fluidized bed boiler The superheater in a boiler is characterized in that the surface of the superheated tube of the contact superheater or the in-layer superheater is coated with a corrosion-resistant metal sprayed layer.
【０００６】[0006]
【実施例】次に本発明の実施例を示す図面の説明に併せ
て本発明を詳説する。 実施例１ 図１は本発明に係わる廃棄物ボイラ−の過熱器における
過熱管の群とス−トブロ−装置の配置の一例を示す模式
図である。図中、１は過熱管、２及び３はス−トブロ−
装置、４はス−トブロ−装置２及び３の先端に設けられ
た噴気孔である。矢印Ａは廃棄物焼却炉で発生した燃焼
ガスの流れの方向を示し、その燃焼ガスが過熱管１の群
を過熱し、過熱蒸気を生成する。そして、過熱管１の群
に対して流れる燃焼ガスの入口側にス−トブロ−装置
２、同じく出口側にス−トブロ−装置３が設けられる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the drawings showing the embodiments of the present invention. Example 1 FIG. 1 is a schematic diagram showing an example of the arrangement of a superheater tube group and a soot blower device in a superheater of a waste boiler according to the present invention. In the figure, 1 is a superheater tube, 2 and 3 are soot blowers.
The device 4 is a fumarole provided at the tip of the soot blower devices 2 and 3. Arrow A indicates the direction of the flow of the combustion gas generated in the waste incinerator, and the combustion gas superheats the group of superheated tubes 1 to generate superheated steam. A soot blower device 2 is provided on the inlet side of the combustion gas flowing to the group of superheated tubes 1, and a soot blower device 3 is also provided on the outlet side thereof.
【０００７】過熱管１は、本体が鋼管からなりその表面
全体に耐食性の金属溶射層が形成されている。耐食性の
金属としては、硬度の高い溶射層を形成するものが好ま
しく、通常ニッケルを主体としたニッケル−クロム系の
溶射材がよい。具体的には、重量％で、ニッケル65〜73
％、クロム10〜17％、硼素1.5 〜5 ％、珪素1.5 〜5
％、鉄1 〜5 ％及び銅1 〜5 ％の割合で含有された組成
からなる溶射材が好ましい。このものは、溶射によって
形成された層の表面が平滑で、ス−トブロ−装置による
処理時に、付着物の除去が特に良好である。この溶射層
の厚さは通常50〜400 μm 、好ましくは100 〜150 μm
である。The superheated tube 1 has a main body made of a steel tube, and a corrosion-resistant metal sprayed layer is formed on the entire surface thereof. As the corrosion-resistant metal, a metal that forms a sprayed layer having high hardness is preferable, and a nickel-chromium sprayed material mainly containing nickel is preferable. Specifically, in weight percent, nickel 65-73
%, Chromium 10 to 17%, boron 1.5 to 5%, silicon 1.5 to 5
%, Iron 1 to 5% and copper 1 to 5% are preferable. In this case, the surface of the layer formed by thermal spraying is smooth, and the removal of deposits is particularly good during the treatment with a soot blower. The thickness of this sprayed layer is usually 50 to 400 μm, preferably 100 to 150 μm.
Is.
【０００８】上記耐食性の金属溶射層によって過熱管は
保護されるが、過熱管表面に付着した煤塵中には上述の
ように金属塩化物が含まれ、かつ過熱管の表面温度は高
く、300℃以上となって管の腐食が激しくなる。そこで
適時、ス−トブロ−装置２及び３の作動によって煤塵が
除去される。ス−トブロ−装置２及び３における噴気孔
４を有する管は、図１中、矢印Ｃで示されるように回転
し、また矢印Ｄ又はＥに示されるように前進、後退し、
先端に形成された噴気孔４によって過熱管１の群の全体
にわたり、かつス−トブロ−装置２及び３により過熱管
１の全面が高圧の噴気に曝され、除塵が達成される。こ
のとき用いられる噴気としては、本発明の過熱器で生成
された過熱蒸気が好ましく、そのほか、圧縮空気を用い
ることができる。The above-mentioned corrosion-resistant metal sprayed layer protects the superheated tube, but the soot dust adhering to the surface of the superheated tube contains the metal chloride as described above, and the surface temperature of the superheated tube is high, which is 300 ° C. As a result, the corrosion of the pipe becomes severe. Soot is removed at appropriate times by the operation of the soot blowers 2 and 3. The tube having the fumaroles 4 in the soot-blowing devices 2 and 3 rotates as shown by an arrow C in FIG. 1, and moves forward and backward as shown by an arrow D or E,
Dust removal is achieved by exposing the entire group of superheated tubes 1 by the blowholes 4 formed at the tips and by the sootblowing devices 2 and 3 to the entire surface of the superheated tubes 1 by the high-pressure jet. As the fumes used at this time, superheated steam generated by the superheater of the present invention is preferable, and compressed air can also be used.
【０００９】ス−トブロ−装置は従来から知られている
ものが何れも使用できるが、上記矢印Ｄ及びＥで示すよ
うに前、後進し、ブロ−イング時のみ炉内に入る長抜差
型が好ましい。過熱管１の群の配列は図１に示すもので
は千鳥配列であるが、格子配列でもよい。しかし、ス−
トブロ−装置による噴出蒸気が多数の過熱管の群に対し
効率よく作用するには千鳥配列の場合が好ましい。上記
のス−トブロ−装置による過熱管に付着する煤塵の除去
に併せ、過熱管表面が耐食性金属の溶射層で被覆されて
いることにより、過熱用の燃焼ガス中に塩化水素ガスが
含まれ、或いは煤塵中に塩化物が混在していても、従来
のように迅速に腐食が進むのを阻止することができる。As the so-called blow-blowing device, any of the conventionally known ones can be used, but as shown by the arrows D and E, a long pull-out type which goes forward and backward and enters the furnace only during blowing. Is preferred. The arrangement of the groups of the superheater tubes 1 is a staggered arrangement as shown in FIG. 1, but may be a lattice arrangement. However,
The staggered arrangement is preferable in order that the steam ejected by the tow blower acts efficiently on a large number of superheated tubes. Along with the removal of soot dust adhering to the superheater tube by the above-mentioned soot blower device, the superheater tube surface is covered with a sprayed layer of a corrosion resistant metal, so that hydrogen chloride gas is contained in the combustion gas for superheat, Alternatively, even if chloride is mixed in the soot and dust, it is possible to prevent the rapid progress of corrosion as in the conventional case.
【００１０】実施例２ 図２は廃棄物ボイラ−である流動床ボイラ−１０におけ
る流動層１１、蒸発器の蒸発管１２及び過熱器の過熱管
１３の配列の一例を示す模式図である。即ち流動床ボイ
ラ−１０は流動媒体によって流動層１１が形成され、こ
の流動層１１の中に蒸発器の蒸発管１２及び過熱器の過
熱管１３が設置されている。流動層温度は約600 〜1000
℃の温度範囲で運転されるので、廃棄物中の可燃分は流
動層内で燃焼し、腐食性ガスが蒸発器の蒸発管１２に
も、過熱器の過熱管１３にも接し、これらの管は腐食さ
れる。そこで上記過熱管１３には前記実施例１で説明し
た耐食性の金属を、かつ前述したと同じ厚さに溶射す
る。これによって過熱管１３の腐食が防止乃至低減され
る。また、蒸発管１２に対しても同様に上記耐食性金属
を溶射し、腐食を防止乃至低減させることができる。な
お、流動層区域において、過熱管、蒸発管には流動媒体
(一般的には珪砂) が直接接触するので燃焼生成物であ
る煤塵は付着しない。従ってス−トブロ−装置は必要と
しない。また耐食性の金属溶射層を形成させる過熱管
は、流動層内に設置されるもののほか、接触過熱器にお
ける過熱管に対しても適用できる。Embodiment 2 FIG. 2 is a schematic view showing an example of the arrangement of a fluidized bed 11, a vaporizer tube 12 of an evaporator and a superheater tube 13 of a superheater in a fluidized bed boiler 10 which is a waste boiler. That is, in the fluidized bed boiler 10, a fluidized bed 11 is formed by a fluidized medium, and in the fluidized bed 11, an evaporation pipe 12 of an evaporator and a superheating pipe 13 of a superheater are installed. Fluidized bed temperature is about 600-1000
Since it is operated in the temperature range of ℃, the combustible components in the waste are burned in the fluidized bed, and the corrosive gas contacts both the evaporation pipe 12 of the evaporator and the superheating pipe 13 of the superheater. Is corroded. Therefore, the above-mentioned superheated pipe 13 is sprayed with the corrosion-resistant metal described in Embodiment 1 and to the same thickness as described above. As a result, corrosion of the superheated pipe 13 is prevented or reduced. Similarly, the corrosion resistant metal can be sprayed on the evaporation tube 12 to prevent or reduce corrosion. In the fluidized bed area, the fluid medium is
Since it is in direct contact with (generally silica sand), soot, which is a combustion product, does not adhere. Therefore, no sootblowing device is required. Further, the superheat pipe for forming the corrosion-resistant metal sprayed layer can be applied not only to the one installed in the fluidized bed but also to the superheat pipe in the contact superheater.
【００１１】[0011]
【発明の効果】焼却時、腐食性物質を生成する廃棄物
(例えば塩化ビニル樹脂屑) を含んでいる廃棄物を熱源
とする廃熱ボイラ−のエネルギ−回収効率を上げるため
付設した過熱器の過熱管の腐食が有効に阻止される。EFFECTS OF THE INVENTION Waste that produces corrosive substances when incinerated
Corrosion of the superheater pipe of the attached superheater is effectively prevented in order to improve the energy recovery efficiency of the waste heat boiler which uses waste containing (for example, vinyl chloride resin scraps) as a heat source.
【図１】実施例１で用いた廃熱ボイラ−の模式図。FIG. 1 is a schematic diagram of a waste heat boiler used in Example 1.
【図２】実施例２で用いた廃熱ボイラ−である流動床ボ
イラ−の模式図。FIG. 2 is a schematic diagram of a fluidized bed boiler, which is a waste heat boiler used in Example 2.
１ 過熱管 ２ ス−トブロ−装置 ３ ス−トブロ−装置 １１ 流動床ボイラ−の流動床 １２ 蒸発管 １３ 過熱管 DESCRIPTION OF SYMBOLS 1 Superheat pipe 2 Soot blower device 3 Soot blower device 11 Fluidized bed of fluidized bed boiler 12 Evaporation pipe 13 Superheated pipe
フロントページの続き (72)発明者 塚本 圭祐 東京都港区港南１丁目６番27号 株式会社 荏原製作所内 (72)発明者 岩下 豪 三重県四日市市東邦町１番地 三菱化成株 式会社四日市工場内 (72)発明者 小林 正幸 三重県四日市市東邦町１番地 三菱化成株 式会社四日市工場内 (72)発明者 滝 義宏 東京都千代田区丸の内二丁目５番２号 三 菱化成株式会社内Front page continuation (72) Inventor Keisuke Tsukamoto 1-6-27 Konan, Minato-ku, Tokyo Ebara Corporation Co., Ltd. (72) Inventor Go Iwashita, Toho-cho, Yokkaichi-shi, Mie Mitsubishi Chemical Corporation Yokkaichi Plant (72) Inventor Masayuki Kobayashi 1 Toho-cho, Yokkaichi-shi, Mie Mitsubishi Kasei Co., Ltd. Yokkaichi Plant (72) Inventor Yoshihiro Taki 2-5-2 Marunouchi, Chiyoda-ku, Tokyo Sanryo Kasei Co., Ltd.
Claims (7)
過熱する過熱器における過熱管の表面又は流動床ボイラ
−における接触過熱器又は層内過熱器の過熱管の表面が
耐食性の金属溶射層で被覆されていることを特徴とする
ボイラ−における過熱器。1. The surface of a superheater tube in a superheater for superheating steam generated in a waste incineration boiler or the surface of a superheater tube in a contact superheater or in-bed superheater in a fluidized bed boiler is a corrosion-resistant metal sprayed layer. A superheater in a boiler characterized by being coated.
過熱する過熱器における過熱管の表面が耐食性の金属溶
射層で被覆されており、かつ上記過熱管の群を加熱する
廃棄物燃焼廃ガスの通路の入口側と出口側にはス−トブ
ロ−装置が設置されていることを特徴とするボイラ−に
おける過熱器。2. A waste combustion waste gas for heating a group of superheated pipes, the surface of a superheater pipe of a superheater for superheating steam generated in a waste incineration boiler is coated with a corrosion resistant metal sprayed layer. A superheater in a boiler, characterized in that a soot blower device is installed on the inlet side and the outlet side of the passage.
層内過熱器の過熱管の表面が耐食性の金属溶射層で被覆
されていることを特徴とする流動床ボイラ−における過
熱器。3. A superheater in a fluidized bed boiler, wherein the surface of the superheater tube of the contact superheater or the in-bed superheater in the fluidized bed boiler is coated with a corrosion-resistant metal sprayed layer.
成分とする組成からなる請求項１、２又は３記載の過熱
器。4. The superheater according to claim 1, 2 or 3, wherein the metal sprayed layer has a composition containing nickel and chromium as main components.
７３％、クロム１０〜１７％、硼素１．５〜５％、珪素
１．５〜５％、鉄１〜５％及び銅１〜５％の割合で含有
される組成からなる請求項１、２、３又は４記載の過熱
器。5. The metal sprayed layer is nickel 65 to 65% by weight.
73%, chromium 10-17%, boron 1.5-5%, silicon 1.5-5%, iron 1-5% and copper 1-5%. The superheater according to 3 or 4.
ある請求項１、２、３、４又は５記載の過熱器。6. A superheater according to claim 1, 2, 3, 4, or 5, wherein the thickness of the metal sprayed layer is 50 to 400 μm.
である請求項１、２、３、４、５又は６記載の過熱器。7. The thickness of the metal sprayed layer is 100 to 150 μm.
The superheater according to claim 1, 2, 3, 4, 5 or 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8532794A JPH07280202A (en) | 1994-04-01 | 1994-04-01 | Superheater in boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8532794A JPH07280202A (en) | 1994-04-01 | 1994-04-01 | Superheater in boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07280202A true JPH07280202A (en) | 1995-10-27 |
Family
ID=13855544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8532794A Pending JPH07280202A (en) | 1994-04-01 | 1994-04-01 | Superheater in boiler |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07280202A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6027697A (en) * | 1995-08-08 | 2000-02-22 | Ebara Corporation | Method and apparatus for treating combustion exhaust gases |
| CN112213252A (en) * | 2020-08-31 | 2021-01-12 | 中国恩菲工程技术有限公司 | Method for testing corrosion resistance of metal coating |
-
1994
- 1994-04-01 JP JP8532794A patent/JPH07280202A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6027697A (en) * | 1995-08-08 | 2000-02-22 | Ebara Corporation | Method and apparatus for treating combustion exhaust gases |
| CN112213252A (en) * | 2020-08-31 | 2021-01-12 | 中国恩菲工程技术有限公司 | Method for testing corrosion resistance of metal coating |
| CN112213252B (en) * | 2020-08-31 | 2023-12-12 | 中国恩菲工程技术有限公司 | Method for testing corrosion resistance of metal coating |
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