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Study on Soot-fire Accident of Heat Recovery Plant of Diesel Ship and on its Countermeasures

柴油船热回收装置烟尘火灾事故及对策研究

基本信息

批准号：
08651096
负责人：
NISHIKAWA Eiichi
金额：
$ 1.41万
依托单位：
Kobe University of Mercantile Marine
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08651096/
关键词：
Diesel ship Soot-file Exhaust gas economizer Outer fouling Finned heating tube Marine accident Dry-out Water circulation デイ-ゼル船

项目摘要

Exhaust gas economizer of diesel ship, which is an effective recovery plant of waste heat, has been troubled by various problems due to outer foulings of its heating surface. Especially very serious one is the melt-down accident of heating surface, so called "soot-fire", induced by burning-up of soots deposited on heating surface. This project could have made clear the mechanism of soot-fire accident and proposed the countermeasures against the soot-fire.1) Simulation model of soot-burning could have been successfully developed and it has been made possible to evaluate the increase of heat transfer surface temperature and heat load due to soot-burning at various conditions.2) The mechanism of the process from soo-burning to soot-fire accident has been revealed. That is, occurence of soot-burning * dry-out of waterside heat transfer surface * rapid increase of temperature of gasside heat transfer surface fin * further increase of fin temperature due to accelerative oxidation of fin materials * melt-down accident.3) According to the obtained results, measures for improving the reliability of exhaust gas economizer could be porposed, and soot-fire accidents could have been avoided successfully owing to those measures.

船舶柴油机废气省煤器是一种有效的余热回收装置，但由于受热面外表面结垢而存在诸多问题。特别是沉积在受热面上的烟尘燃烧后，引起受热面熔化事故，即“烟火”事故。本项目的研究成果可以明确锅炉灰燃事故的机理，并提出相应的对策：1）成功地建立了锅炉灰燃过程的仿真模型，可以对各种工况下锅炉灰燃引起的传热表面温度和热负荷的增加进行评估; 2）揭示了锅炉灰燃到灰燃事故的机理。根据分析结果，提出了提高废气省煤器可靠性的措施。采取这些措施，才能成功避免煤烟火灾事故。