JPS5851200B2 - How to clean combustion gas contact surfaces - Google Patents

How to clean combustion gas contact surfaces

Info

Publication number
JPS5851200B2
JPS5851200B2 JP189278A JP189278A JPS5851200B2 JP S5851200 B2 JPS5851200 B2 JP S5851200B2 JP 189278 A JP189278 A JP 189278A JP 189278 A JP189278 A JP 189278A JP S5851200 B2 JPS5851200 B2 JP S5851200B2
Authority
JP
Japan
Prior art keywords
water
combustion gas
gas contact
deposits
washing
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
Application number
JP189278A
Other languages
Japanese (ja)
Other versions
JPS5495057A (en
Inventor
都茂 近藤
貞夫 原田
正治 中森
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP189278A priority Critical patent/JPS5851200B2/en
Publication of JPS5495057A publication Critical patent/JPS5495057A/en
Publication of JPS5851200B2 publication Critical patent/JPS5851200B2/en
Expired legal-status Critical Current

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Description

【発明の詳細な説明】 本発明は燃焼ガス接触面部以外の部分に害を及ぼすこと
なく燃焼ガス接触面部のみを迅速に洗浄する方法に関す
る。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for quickly cleaning only a combustion gas contacting surface without harming other parts.

一般に、重油、原油および石油プラント等の残渣油を燃
焼させるボイラ炉内各部には、これらの燃料灰を主成分
とする付着物(以下、単に付着物と記す)が堆積し、次
に示すような諸種の障害を誘発することが知られている
In general, deposits mainly composed of these fuel ash (hereinafter simply referred to as deposits) accumulate in various parts of boiler furnaces that burn heavy oil, crude oil, and residual oil from petroleum plants. It is known to induce various types of disorders.

(1) 付着物はボイラ炉内の伝熱面外表面に多量に
付着し、熱伝達を阻害する。
(1) A large amount of deposits adheres to the outer surface of the heat transfer surface in the boiler furnace and obstructs heat transfer.

(2)この結果、排ガス温度が上昇し、ガス流路内の機
器類に悪影響を及ぼす。
(2) As a result, the exhaust gas temperature rises, which adversely affects equipment in the gas flow path.

(3)付着物は一般に金属に対する腐食性が強く、伝熱
面を腐蝕する。
(3) Deposits are generally highly corrosive to metals and corrode heat transfer surfaces.

(4)付着物の堆積量が多くなると、排ガス流路を狭め
、燃焼そのものが困難となり、ボイラの正常運転が阻害
される。
(4) When the amount of deposits increases, the exhaust gas flow path is narrowed, combustion itself becomes difficult, and normal operation of the boiler is inhibited.

一方、本発明者等は、重油燃焼ボイラ炉内の付着物の性
状を調べたところ、次表に示すような結果を得た。
On the other hand, the present inventors investigated the properties of deposits inside a heavy oil-fired boiler and obtained the results shown in the following table.

上表から明らかなように、同一ボイラでも付着する場所
により、化学成分はもとより、硬さ、伝熱管に対する密
着性等の物理的性質が異なり、般に、伝熱管温度の高い
所ではバナジウムが多くて硬いが、低い所ではバナジウ
ムが少なく水溶性成分のpHが低い傾向がある。
As is clear from the above table, even in the same boiler, the physical properties such as hardness and adhesion to heat transfer tubes vary depending on the location where it is deposited, as well as the chemical composition. However, at low temperatures, there is little vanadium and the pH of water-soluble components tends to be low.

すなわち、料燃中に含まれる硫黄分が、 S+02→5O2 S +’/202→5O3 SO+HO4H2SO4 2 のように反応して一部が硫酸となり、硫酸は低温である
ほど凝縮し易いため、伝熱管温度の低い所はどpHが低
くなるわけである。
In other words, the sulfur contained in the fuel reacts as follows: S+02→5O2 S +'/202→5O3 SO+HO4H2SO4 2 , and part of it becomes sulfuric acid. Sulfuric acid condenses more easily at lower temperatures, so the heat exchanger tube temperature Where the pH is low, the pH will be low.

従来は、上記のように障害に対処するために、停缶時に
、高温部管の付着物はハンマーやサンドブラスト等によ
って除去しているが、多数の人力を要するばかりか騒音
や粉塵が大きく作業環境を著しく悪化し、しかも後者の
場合使用済みサンドを廃棄物として除去する際の問題が
残り、また低温部管の付着物は軟質であり、かつ伝熱面
積が大きくその構造上人力の届く範囲が限定されるため
、高温部管のような方法で除去することはできない。
Conventionally, in order to deal with the above-mentioned problems, deposits on the high-temperature pipes are removed using hammers, sandblasting, etc. when the tank is stopped, but this not only requires a lot of manpower but also creates noise and dust, which creates a difficult work environment. Moreover, in the latter case, problems remain when removing the used sand as waste, and the deposits on the low-temperature pipes are soft, and the heat transfer area is large, making it difficult to reach by human power. It cannot be removed by methods such as hot section tubes.

そのため低温部管の付着物は水洗によって除去する方法
が考えられるが、水洗済み水はpHが低く、また構造上
水洗が十分に行なわれない個所があるため、水洗済み水
が滞溜し、二次障害としての酸腐食が進行する等の重大
な事故発生の恐れがある。
For this reason, it is possible to remove the deposits from the low-temperature pipes by washing them with water, but the pH of the washed water is low, and there are some parts where washing cannot be done sufficiently due to the structure, so the water that has been washed may stagnate. There is a risk of serious accidents such as progression of acid corrosion as a secondary failure.

これに対処するため、アルカリ性の水を水洗水として用
いることも考えられるが、人体に有害なアルカリの使用
と共に水洗の個所によっては酸の中和不十分に起因する
腐食発生や点火昇温時の残留アルカリ塩の影響等があり
、完全な対策ではない。
To deal with this problem, it is possible to use alkaline water as washing water, but in addition to using alkaline water that is harmful to the human body, depending on the washing area, corrosion may occur due to insufficient acid neutralization, and when the ignition temperature rises. This is not a perfect countermeasure as it is affected by residual alkali salts.

そこで本発明者等は、′上表に示す付着物の性状を検討
した結果、水溶性成分が比較曲事いため水洗水を工夫す
れば酸腐食を防止しながら除去することが可能であると
いう知見を得、先に水洗を必要としない部分を非透水性
シートで覆い酸腐食抑制剤を添加した水洗水を用いて腐
食を防止しながら付着物を除去する方法を提案し←特願
昭52−31558号〔特開昭53−134102号〕
参照)、実作業に応用しつつあるが、該作業を通じて、
被水洗対象物以外への完全な防水処置が極めて重要であ
ることに気付いた。
Therefore, the present inventors investigated the properties of the deposits shown in the table above, and found that the water-soluble components are relatively difficult to remove, and if the washing water is modified, it is possible to remove the deposits while preventing acid corrosion. proposed a method of removing deposits while preventing corrosion by first covering parts that do not require water washing with a water-impermeable sheet and using washing water containing an acid corrosion inhibitor. No. 31558 [Unexamined Japanese Patent Publication No. 53-134102]
), is being applied to actual work, and through this work,
I realized that complete waterproofing of objects other than those to be washed is extremely important.

すなわち、重油燃焼ボイラや鋼材を加熱する燃焼炉の構
造材には一般に鋼材を使用しているが、強度の不必要な
部分(すなわち燃焼ガス接触面部以外の部分)の構造材
には耐火レンガ類を使用しており、上記先行方法により
炉内を洗浄した場合、鋼材に対しては防腐食効果がある
が、耐火レンガに対しては、該耐火レンガが多孔質であ
るため水洗水が該耐火レンガ内に多量に浸透してしまい
、水洗終了後点火されて温度が上昇して来ると、この浸
透した水洗水が蒸発し、昇温か極めて緩慢であれば問題
ないが、通常の運転では該水洗水の蒸気化が急激であり
、大きな体積膨張が起こり、耐火レンガの破壊が生じる
In other words, steel is generally used for the structural materials of heavy oil-fired boilers and combustion furnaces that heat steel materials, but refractory bricks are used for structural materials in areas where strength is unnecessary (i.e., areas other than the combustion gas contact surface). When the inside of the furnace is cleaned using the preceding method, it has a corrosion-preventing effect on steel materials, but since the firebricks are porous, the washing water is If a large amount of water permeates into the bricks and the temperature rises when the water is ignited after washing, the permeated washing water will evaporate and there will be no problem if the rising temperature is very slow, but under normal operation the washing water The evaporation of water is rapid, a large volumetric expansion occurs, and the destruction of the refractory brick occurs.

従って、耐火レンガ部(すなわち燃焼ガス接触面部以外
の部分)には水洗水がかからないようにすることが必要
であり、このために上記先行方法では、非透水性シート
を用いて防水対策を施こしているが、構造が複雑な部分
での完全な防水は困難であった。
Therefore, it is necessary to prevent washing water from splashing on the refractory brick part (i.e., the part other than the combustion gas contact surface), and for this reason, in the above-mentioned previous method, waterproofing measures are taken using a non-water permeable sheet. However, it has been difficult to completely waterproof parts with complex structures.

本発明は以上の諸点に鑑みてなされたもので、燃料灰を
主成分とする付着物が付着した燃焼ガス接触面部へ水を
供給して前記付着物を溶解除去する燃焼ガス接触面の洗
浄方法において、前記燃焼ガス接触面部以外の部分に合
成樹脂からなるエマルジョン状の防水剤を塗布して皮膜
を形成させた後、水を供給することを特徴とする燃焼ガ
ス接触面の洗浄方法を要旨とするものである。
The present invention has been made in view of the above points, and is a method for cleaning a combustion gas contact surface, which supplies water to a combustion gas contact surface on which deposits mainly composed of fuel ash have adhered to dissolve and remove the deposits. In the above, a method for cleaning a combustion gas contact surface is provided, which comprises applying an emulsion-like waterproofing agent made of synthetic resin to a portion other than the combustion gas contact surface to form a film, and then supplying water. It is something to do.

本発明方法における防水剤は、塩化ビニルモノマ、アク
リルモノマ、酢酸ビニルモノマ、スチレンモノマ、スチ
レン−ブタジェンモノマー等の重合性モノマを乳化剤に
より水に溶かしてエマルジョン化したもの、あるいはア
ルキッド樹脂等のポリマを親水化して乳化剤によりエマ
ルジョン化したもの、その外一旦乾燥すると水不溶性の
皮膜を形成する各種の合成樹脂をエマルジョン化したも
の等であり、上記乳化剤としてはマレイン化ポリブタジ
ェン等のアニオン活性剤等が使用できる。
The waterproofing agent used in the method of the present invention is an emulsion obtained by dissolving a polymerizable monomer such as vinyl chloride monomer, acrylic monomer, vinyl acetate monomer, styrene monomer, or styrene-butadiene monomer in water using an emulsifier, or a hydrophilic polymer such as alkyd resin. and emulsions made from various synthetic resins that form a water-insoluble film once dried.As the emulsifier, anionic activators such as maleated polybutadiene can be used. .

上記防水剤は、燃焼ガス接触面部以外の部分に塗布され
るが、 (1)スプレー、ハケ塗り、その外いかなる方法にても
塗布可能であり、 (2)塗布施工時、水にて希釈可能であり、火災や衛生
上の危険がなく、 (3)人力の届かないような複雑な構造部に対しても充
分に塗布可能であり、 (4)乾燥後は非透水性の皮膜を形成し、塗布作業能率
が極めて良いばかりか、防水効果が極めて良好である。
The above waterproofing agent is applied to areas other than the combustion gas contact surface, but (1) it can be applied by spraying, brushing, or any other method, and (2) it can be diluted with water during application. (3) It can be applied to complex structures that cannot be reached by human power; (4) It forms an impermeable film after drying. Not only is the coating efficiency extremely high, but the waterproofing effect is also extremely good.

また、上記防水剤はC,H,0等の有機化合物から構成
されるため、水洗終了後皮膜を除去せずに運転を再1開
しても該皮膜は燃焼してしまい、運転再開後における防
水処理部の悪影響は全くない。
In addition, since the above waterproofing agent is composed of organic compounds such as C, H, and 0, even if the operation is restarted without removing the film after washing with water, the film will be burned, and the film will be burned. The waterproofing part has no negative effects at all.

以下、添付図面を用いて本発明方法の要領とその作用お
よび効果を説明する。
Hereinafter, the gist of the method of the present invention, its operation, and effects will be explained using the accompanying drawings.

第1図は、本発明方法をボイラの節炭器に適用する場合
の例を示すものである。
FIG. 1 shows an example in which the method of the present invention is applied to a boiler economizer.

図において、被水洗対象物である節炭器1と前後・左右
側壁部等との間隔は50mm程度と狭く、運転後は付着
物によりこの間隔は一層狭められ、更に該節炭器1と側
壁との間には種々の連結管2やサイズミックスタイ3が
設けられているため、節炭器1以外の部分をビニルシー
ト等の非透水性のシートで完全に覆うことは不可能であ
り、かつ水洗済みの水が滞留し易すくなっている。
In the figure, the distance between the economizer 1, which is the object to be washed, and the front, rear, left, and right side walls is narrow, about 50 mm, and after operation, this distance becomes even narrower due to deposits, and furthermore, the distance between the economizer 1 and the side walls, etc. Since various connecting pipes 2 and size mix ties 3 are provided between the economizer 1 and the economizer 1, it is impossible to completely cover the parts other than the economizer 1 with a non-water permeable sheet such as a vinyl sheet. In addition, water that has already been washed tends to accumulate.

そこで、上記防水剤を水にて適当な粘度に薄め、節炭器
1上部の各側壁部よりスプレーやハケ等を用いて下部へ
流下させる。
Therefore, the above-mentioned waterproofing agent is diluted with water to an appropriate viscosity, and is allowed to flow down from each side wall of the upper part of the economizer 1 to the lower part using a spray, a brush, or the like.

次いで、防水剤が目的とする塗布部分を十分塗布してい
ることを炉内照明や懐中電溶により確認した後、放置し
て乾燥させる。
Next, after confirming that the waterproofing agent is sufficiently applied to the intended application area using furnace lighting or a flashlight, the area is left to dry.

乾燥後、形成された皮膜4を亀裂等のないことを確認し
た上で、万全を期するためビニルシート等の非透水性シ
ート5を用いて先行方法の防水対策を施こすこともでき
る。
After drying, after confirming that there are no cracks or the like in the formed film 4, the waterproofing measures of the previous method may be applied using a water-impermeable sheet 5 such as a vinyl sheet to ensure complete safety.

しかる後、節炭器1の上部および下部に設置された可動
式のノズル6により水洗水をスプレーする。
Thereafter, washing water is sprayed by movable nozzles 6 installed at the upper and lower parts of the economizer 1.

該ノズル6はフレキシブルな給水管Tにより流量計8、
バルブ9、給水ポンプ10を介して給水ライン11に接
続されている。
The nozzle 6 is connected to a flow meter 8 by a flexible water supply pipe T.
It is connected to a water supply line 11 via a valve 9 and a water supply pump 10.

また節炭器1の下部には、ホッパートラストビーム12
等ヲ利用した足場13が設置され、この上にビニルシー
ト等にて水洗水の受槽19が設けられ、該受槽19の底
部に排水ポンプ(スラリポンプ)14が取付けられてい
る。
In addition, a hopper trust beam 12 is installed at the bottom of the economizer 1.
Scaffolding 13 is installed, and a receiving tank 19 for washing water is provided with a vinyl sheet or the like on top of the scaffolding 13. A drainage pump (slurry pump) 14 is attached to the bottom of the receiving tank 19.

上記の可動式ノズル6よりスプレーされた水洗水は、節
炭器1の付着物を溶解・剥離して上記の受槽19に落下
するが、節炭器1以外の部分には皮膜4と非透水性シー
ト5により完全防水が施こされているため全く接触する
ことはない。
The washing water sprayed from the movable nozzle 6 dissolves and peels off the deposits on the economizer 1 and falls into the receiving tank 19, but the parts other than the economizer 1 are covered with a film 4 and non-water permeable. Since the adhesive sheet 5 is completely waterproof, there is no possibility of any contact.

該受槽19に溜った水洗済み水は、上記の排水ポンプ1
4により排出され、配管15により流量計17、pH計
18を経て流量とpHがチックされつつ炉外の中和槽1
6へ送られる。
The washed water accumulated in the receiving tank 19 is transferred to the drain pump 1 described above.
4, and the flow rate and pH are checked through piping 15 through a flowmeter 17 and a pH meter 18, and the neutralization tank 1 outside the furnace is discharged.
Sent to 6.

この流量とpHのチックにより水洗状況を判断し、該状
況に応じて水洗水量を増減する。
The washing condition is determined based on the flow rate and pH tick, and the amount of washing water is increased or decreased depending on the situation.

以上説明したように本発明方法によれば、構造が複雑で
人力が届ないような個所においても、燃焼ガス接触面部
以外の部分の防水対策が容易かつ完全であるため、該部
分に害を及びすことなく燃焼ガス接触面部のみを迅速に
洗浄することができる。
As explained above, according to the method of the present invention, even in places where the structure is complex and human power cannot reach, waterproofing of parts other than the combustion gas contact surface is easy and complete, so that there is no possibility of harm to the parts. Only the combustion gas contact surface can be quickly cleaned without cleaning.

本発明方法はボイラに限らず、加熱炉、ゴミ焼却炉、ガ
スタービン等にも適用することができる。
The method of the present invention is applicable not only to boilers but also to heating furnaces, garbage incinerators, gas turbines, etc.

次に、実施例および参考例を挙げて本発明方法の効果を
更に具体的に説明する。
Next, the effects of the method of the present invention will be explained in more detail with reference to Examples and Reference Examples.

実施例 防水剤としてアクリル酸エステル共重合体を水に懸濁し
た合成ラテックスを用い、第1図に示す要領にて塗布し
、io時間放置して乾燥させた。
Example A synthetic latex prepared by suspending an acrylic acid ester copolymer in water was used as a waterproofing agent, and it was applied as shown in FIG. 1 and left to dry for io hours.

なお、第2図に示す5TBA24スキマ試験片(l二1
0am、m=2018.1−1:3 Q朋、0=((ス
キマ)=2朋、P=7朋)(1)と5TBA24平板試
験片(5X20 X3 omm)(2)とを用い、(1
)については上記と同じ防水剤を塗布・乾燥させたもの
を節炭器1の真下(水洗水の落下する位置)と受槽19
とへ、(2)については一方に上記と同じ防水剤を塗布
・乾燥し他方は防水剤を塗布せずに両者を受槽19へ、
それぞれ取付けた。
In addition, the 5TBA24 gap test piece shown in Figure 2 (l21
0am, m=2018.1-1:3 Q. Using (1) and 5TBA24 flat plate test piece (5X20 X3 omm) (2), 1
), apply and dry the same waterproofing agent as above and apply it to the tank 19 directly below the economizer 1 (the position where the flushing water falls) and the water tank 19.
Tohe, regarding (2), apply the same waterproofing agent as above to one side and dry it, and put both into the receiving tank 19 without applying the waterproofing agent to the other side.
Installed each.

しかる後、第1図に示す要領で水洗を行なった。Thereafter, washing with water was performed as shown in FIG.

水洗終了後、運転を再開したところ、節炭器1出ロ排ガ
ス温度は水洗直前に比奴して約70℃低下しており、こ
れにより節炭器1に付着していた付着物が完全に除去さ
れ、節炭器1での熱回収が効率良く行なわれていること
が判明した。
When we restarted the operation after washing, we found that the temperature of the exhaust gas from the economizer 1 had dropped by about 70°C compared to just before washing, and as a result, the deposits that had adhered to the economizer 1 were completely removed. It was found that heat recovery in the economizer 1 was carried out efficiently.

また、上記試験片(1)については、水洗開始後約40
時間経過した後に取り出し、皮膜を除去してスキマ部の
濡れ状態を観察したが水分は全く認められず、試験片(
2)については1時間毎に取り出してその腐食減量を調
べたところ、防水剤を塗布したものは0.005〜0.
008■/cIfl−hで、塗布しなかったものは0.
1〜0.157’Q〆ボ・hであった。
In addition, for the above test piece (1), approximately 40
After a period of time, the test piece was taken out, the film was removed, and the wet state of the gap was observed, but no moisture was observed.
As for 2), we took it out every hour and examined its corrosion weight loss, and found that those coated with waterproofing agent ranged from 0.005 to 0.
008■/cIfl-h, and those that were not coated were 0.
It was 1 to 0.157'Q〆bo・h.

参考例 防水剤として (1)塩化ビニルモノマと乳化剤(マレイン化ポリブタ
ジェン)を水に溶かしてエマルジョン化シたもの (2)アクリルモノマと(1)と同じ乳化剤を水に溶か
してエマルジョン化したもの (3)アルキッド樹脂を親水化して(1)と同じ乳化剤
によりエマルジョン化したもの を用い、市販の耐火レンガに塗布し、2日後、この耐火
レンガを水中に1時間浸漬してその含水量を求めたとこ
ろ、下表結果が得られた。
Reference examples Waterproofing agent: (1) vinyl chloride monomer and emulsifier (maleated polybutadiene) dissolved in water to form an emulsion (2) acrylic monomer and the same emulsifier as (1) dissolved in water to form an emulsion (3) ) An alkyd resin made hydrophilic and emulsified with the same emulsifier as in (1) was applied to a commercially available refractory brick, and two days later, the refractory brick was immersed in water for 1 hour to determine its water content. , the results shown in the table below were obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明方法をボイラに適用する場合の一例を示
す説明図、第2図は実施例で用いた5TBA24スキマ
試験片を示す斜視図である。
FIG. 1 is an explanatory view showing an example of the case where the method of the present invention is applied to a boiler, and FIG. 2 is a perspective view showing a 5TBA24 gap test piece used in the example.

Claims (1)

【特許請求の範囲】[Claims] 1 燃料灰を主成分とする付着物が付着した燃焼ガス接
触面部へ水を供給して前記付着物を溶解除去する燃焼ガ
ス接触面の洗浄方法において、前記燃焼ガス接触面部以
外の部分に合成樹脂からなるエマルジョン状の防水剤を
塗布して皮膜を形成させた後、水を供給することを特徴
とする燃焼ガス接触面の洗浄方法。
1. In a method for cleaning a combustion gas contact surface in which water is supplied to a combustion gas contact surface to which deposits mainly composed of fuel ash have adhered to dissolve and remove the deposits, a synthetic resin is applied to a portion other than the combustion gas contact surface. A method for cleaning combustion gas contact surfaces, which comprises applying water to form a film by applying an emulsion-like waterproofing agent consisting of:
JP189278A 1978-01-13 1978-01-13 How to clean combustion gas contact surfaces Expired JPS5851200B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP189278A JPS5851200B2 (en) 1978-01-13 1978-01-13 How to clean combustion gas contact surfaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP189278A JPS5851200B2 (en) 1978-01-13 1978-01-13 How to clean combustion gas contact surfaces

Publications (2)

Publication Number Publication Date
JPS5495057A JPS5495057A (en) 1979-07-27
JPS5851200B2 true JPS5851200B2 (en) 1983-11-15

Family

ID=11514224

Family Applications (1)

Application Number Title Priority Date Filing Date
JP189278A Expired JPS5851200B2 (en) 1978-01-13 1978-01-13 How to clean combustion gas contact surfaces

Country Status (1)

Country Link
JP (1) JPS5851200B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58169335U (en) * 1982-05-08 1983-11-11 三井造船株式会社 Diesel ship chimney cleaning device
JPS6176809A (en) * 1984-09-25 1986-04-19 三菱重工業株式会社 Acid washing method

Also Published As

Publication number Publication date
JPS5495057A (en) 1979-07-27

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