スートファイア (排ガスエコノマイザメルトダウン事故) の発生機構
スートファイア (排ガスエコノマイザメルトダウン事故) の発生機構
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DOI：
10.5988/jime1966.28.717
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发表时间：
1993-11
期刊：
影响因子：
--
通讯作者：
栄一 西川
中科院分区：
文献类型：
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作者：
栄一 西川
本文对柴油机船用废气省煤器的烟炱着火事故机理进行了研究。本文是继第一篇报道之后的第二篇报道，利用模拟模型对废气省煤器的燃灰过程进行了研究。根据模拟结果，只有在碳烟燃烧的情况下，传热表面的温度才能达到其熔点。因此，很难认为煤烟火灾仅仅是由煤烟燃烧释放的热量引起的。据报道，管材料的氧化热可能是另一个热源。因此，进行了实验，以测量管材的氧化速率，并揭示了氧化热可能是另一个热源的可能性，当氧化速率被高温蒸汽气氛和“脱离“氧化加速时。结果表明，烟炱着火是由一系列过程引起的，即烟炱在翅片管上的燃烧、烟炱燃烧引起的翅片管水侧干化、干化引起的水侧排热突然下降、翅片温度迅速升高、铁氧化引起的翅片温度进一步升高，最后传热表面熔化。
The mechanism of soot-fire accident of exhaust gas economizer in diesel ship is investigated in this report. This is the second report following the first one, in which the process of soot-burning of exhaust gas economizer was studied by a simulation model. According to the soot-burning simulation, temperature of heat transfer surface seldom reaches its melting point only by soot-burning. So it is difficult to consider that soot-fire is occurred only by heat released by the soot-burning. It has been reported the oxidative heat of tube materials might be another heat source. The experiments, therefore, are carried out in order to measure the rate of oxidation of tube materials, and reveal that there is a possibility that the oxidative heat might be another heat source when the oxidation rate is accelerated by the high temperature steam atmosphere and the“break-away”oxidation. Accordingly it is made clear the soot-fire is occurred by a series of events, that is, burning of soots deposited on finned tubes, waterside dry-out of the finned tubes induced by the soot-burning, sudden degradation of waterside heat removal due to the dry-out, rapid increase of fin temperature, and further increase of the fin temperature due to oxidation of iron, and finally melt-down of the heat transfer surfaces.