舶用ボイラにおける水注入燃焼について
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概要
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In accordance with the recent tendency using the low grade fuel oil for marine use, the behavior of fire-side fouling has been a more important problem on the marine oil-fired boilers.<BR>There are many problems to be considered for the fire-side fouling especially in using the low grade fuel oil, however the mechanism of the fouling on oil-fired boiler has been well established.<BR>Generally the fire-side deposits are scaled off by water washing which occupies greater part of docking works.<BR>For the purpose of reduction in the formation of fire-side deposits in view point of improving the combustion process due to the microexplosion phenomenon of water-in-oil emulsion, the water injection system was installed experimentally to the existing boiler on the turbine ship “KINKOMARU” which was put in service in 1972.<BR>In this paper, the long-term investigation into the characteristic of fire-side deposits under the emulsified combustion extending over a period of 14 months was evaluated, comparing with the property prior to the installation of water injection system.<BR>The following effects were obtained under the lower excess air combustion due to the emulsified combustion, which seemed to have a good influence for the fire-side fouling.<BR>The water injection rate was maintained at 2% to the fuel oil flow in consideration of watersaving for marine use.<BR>(1) Low level fouling was observed on furnace and superheater<BR>(2) Easy scaling off of deposits on superheater<BR>(3) Reduction in carbon monoxide (CO) concentration was measured.
- 社団法人 日本マリンエンジニアリング学会の論文
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- 舶用ボイラにおける水注入燃焼について