著者
佐川 隆一 加藤 幸三 松田 裕昌 蔵田 親利 森 鋭和
出版者
The Japan Institute of Marine Engineering
雑誌
日本舶用機関学会誌 (ISSN:03883051)
巻号頁・発行日
vol.8, no.9, pp.697-708, 1973

近年, 舶用主機の大容量化に伴い, ボイラ燃焼室の発熱負荷は大幅に増大している.これにより加熱管の局所過熱や熱計算法の再検討等の問題が起きている.これらの問題点に関する情報を得るために, 自然循環ボイラ (蒸発量30T/H) を用いて実験を行なった.<BR>本報告は, これらの問題に大きな関連を持つ燃焼ガスのフローパターン, 炉内温度分布, 熱流束分布等の実験結果について示す.<BR>まず, 炉内フローパターンの観察を5孔ピトー管, 発煙筒等を用いて行なった結果, 以下のことが判明した.<BR>(1) フロパターンは燃焼時でも非燃焼時でもほとんど同様である. (2) 火炎形状は卵形であり, 燃焼室の形状には無関係である. (3) 火炎と底面の間の狭い領域に強い逆流が存在している. (4) 上部空間には炎がなく, ガスは停滞している.<BR>次に, 吸引式温度計を用いて炉内温度分布を測定した結果, フローパターンの計測並びに火炎形状の観察結果と良い対応を示した.最高温度は火炎のバーナ寄り約1/3の所で記録された.燃焼室出口ガス温度は計算結果と大体一致した.<BR>最後に, 手製の熱流束計を用いて熱流束の分布を測定した.本装置は全熱流束だけでなく, ふく射成分のみの分離計測も可能である.最大熱流束は火炎の中央で記録され, その値は燃焼室平均値より67~84%大きかった.その結果, 各々の水冷管の熱吸収割合にはかなり大きな差が現われた.この差異はボイラの循環や安全性に大きな影響を持っているであろう.<BR>全熱流束に対するふく射成分は2/4負荷時に約84%であった.
著者
鈴木 清
出版者
The Japan Institute of Marine Engineering
雑誌
日本舶用機関学会誌 (ISSN:03883051)
巻号頁・発行日
vol.34, no.5, pp.320-327, 1999-05-01

The ship have completed the docking survey at Singapore. After twenty hours in sailing for loading port, the main deisel engine occurred explosion in the scavenging air manifold. And then the main engine stopped by auto.device. But it was not re-start. Both of the aux. blowers damaged at impeller and casing. The ship was staying for a week at emergency anchorage. The aux, blowers changed completely with elect. Motors. It caused that much accumulated oily mist in the scavenging air manifold by the drain pipe be blockade was ignited.
著者
吉川 文隆 内田 幸宏 藤田 健二 矢野 昭彦 川添 強 佐田 裕之
出版者
The Japan Institute of Marine Engineering
雑誌
マリンエンジニアリング (ISSN:13461427)
巻号頁・発行日
vol.43, no.2, pp.258-264, 2008
被引用文献数
1

The previous report described the corrosive wear on propeller shaft sleeves, made of bronze, in seawater-lubricated stem tube bearings. Accompanying is the occurrence of craters on the sleeve surface due to the action of erosion corrosion. As a countermeasure, based on the mechanism, this second report will provide the development of a catholic protection bearing, what prevents corrosion of the sleeve surface and reduces wear. Using anodes installed in some of the water channel grooves of the rubber bearings, this method is characterized by intermittent protection at best, and protection conditions were investigated by means of fundamental testing and using bearings of 140mm in diameter. As a result, a current density of 8A/m<SUP>2</SUP> was found to protect the sleeve from corrosive wear. Cathodically protected bearings were also applied to bearings of 500mm in diameter and equipped for a ferry vessel. The results are presented here in terms of bearing design, trial running, and successful reduction of wear during actual in-service use.
著者
西山 洋一郎
出版者
The Japan Institute of Marine Engineering
雑誌
日本舶用機関学会誌 (ISSN:03883051)
巻号頁・発行日
vol.32, no.9, pp.684-690, 1997-09-01
被引用文献数
1

The new hydrographic surver ship "SHOYO" with capacity of 3, 200tons, is now under construction in the Japan Maritime Safety Agency as a replacement of the old ship "SHOYO" which was constructed in 1972.<BR>This new ship is expected to be completed in March, 1998.<BR>The electric propulsion system was first employed in the Japan Meritime Safety Agency. It is equipped with diesel engine generators as a power source for every application on sailing.<BR>The electric propulsion system is provided with 2 sets of 2, 800kW main-generators to drive the fixed pitch propellers at a motor output and speed of 2, 100kW/262-290rpm ahead.<BR>The thyristor motor system is applied to driving 2 sets (2 shafts of propellers.)<BR>In addition, one set of bow-thruster (800kW) is located at the stem for controling the ship with the Joy-stick conbined to the electric propulsion system during fixed point observation.