权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on Combustion Improvement of Low-Grade Bunker Fuel Oil by Auxiliary Hydrogen Injection

辅助注氢改善低标号船用燃料油燃烧的研究

基本信息

批准号：
13650228
负责人：
TAJIMA Hiroshi
金额：
$ 2.3万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650228/
关键词：
Hydrogen Low-Grade Oil Marine Engines Merging Sprays Gas Engine Diesel Engines High-Speed visualization Constant Volume Chamber

项目摘要

In the first year (2001), researchers mainly focused on the investigation of combustion problem caused by low-grade bunker fuel oil and the construction of hydrogen injection system. Results from the investigation study were summarized as experimental reports presented in the several international conferences. The problems with low-grade fuel resulted in two aspects ; one is its longer ignition delay that has almost three times as long as normal BFOs and the other is its slower burning speed that is never enough for spray flame to go up toward the injection nozzle. Important information about hydrogen injection system was also obtained in such occasions through discussions with other researchers.In the second year (2002), characteristics of hydrogen-assisted combustion were visually investigated in detail. Unique feature of combustion promoting effect of hydrogen was unveiled. When hydrogen is injected just after the fuel injection, ignition of hydrogen sometimes happens in the vicinity of nozzle tip and after the ignition fuel spray was immediately covered by the luminous flame because of rapid propagation of hydrogen flame, which reduces total combustion period drastically. To purpose reducing PM emission, which is thought to be final unburnt products of combustion, hydrogen was injected just before the end of fuel injection. The result showed that disturbance caused by the rapid expansion of hydrogen/air mixture and its higher combustion temperature helped the reduced to burn completely and generate considerably less smoke.On the whole, this research was successfully concluded on both conception and verification sides.

在2001年的第一年，研究人员主要集中在低品级燃料油引起的燃烧问题的研究和氢气喷射系统的建设上。调查研究的结果被总结为在几次国际会议上提交的实验报告。低品位燃料的问题导致了两个方面：一是点火延迟时间较长，几乎是普通BFO的三倍；二是燃烧速度较慢，永远不足以让喷雾火焰上升到喷嘴。通过与其他研究人员的讨论，也在这些场合获得了关于氢气喷射系统的重要信息。在第二年(2002年)，我们对氢气辅助燃烧的特性进行了详细的可视化研究。揭示了氢气助燃作用的独特性。在喷油后立即喷氢时，由于氢火焰的快速传播，有时会在喷嘴尖端附近和点火后的燃油喷雾被发光火焰覆盖后发生氢气着火，从而大大缩短了总燃烧周期。为了减少PM排放(被认为是燃烧的最终未燃烧产物)，在燃料喷射结束之前注入了氢气。结果表明，氢气/空气混合物的快速膨胀和较高的燃烧温度引起的扰动有助于还原燃料完全燃烧并产生较少的烟雾。总体来说，本研究在构思和验证方面都是成功的。