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水平金属丝网管升膜微型燃烧器高效燃烧技术研究
The Study on High Efficient Combustion Technology of Micro Combustor Based on Rising Film Formed by Horizontal Metallic Mesh Tube
【作者】 张斌；
【导师】 梅宁；
【作者基本信息】 中国海洋大学 ， 工程热物理， 2009， 硕士
【摘要】 理论分析和试验结果表明,液体在受热的水平金属丝网管壁面能够形成比较均匀的上升薄液膜,可以起到强化传热传质的作用。本文将水平金属丝网管升膜蒸发机理应用于额定功率为2KW的某微型燃烧器中,实现了原理机的工作,并对其进行了高效燃烧技术研究。本文的研究表明,基于水平金属丝网管升膜蒸发机理的微型燃烧器具有良好的工作性能,燃油蒸发结构简单,燃料蒸发量可灵活调节,油气混合快速充分,具有高的燃烧效率和低的污染物排放。使用富氧空气对水平金属丝网管升膜微型燃烧器助燃可以获得更高的燃烧效率和燃烧温度,有利于强化燃烧室内传热,提高了热效率,节约了能源,还能有效地减少和控制污染物排放。基于FLUENT的水平金属丝网管升膜微型燃烧器燃烧过程的CFD模拟基本上可以反映燃烧器实际的燃烧状况,数值结果和试验结果吻合良好,数值模拟的成功实现为燃烧器性能的分析和改进提供了强有力的理论指导,减少了试验的时间和盲目性,降低了设计成本。此外,本文还进行了利用梯度磁场富集氧气的理论和试验研究,以期为富氧燃烧寻找一种简易、经济、节能的富氧方法,使富氧燃烧技术得到普遍推广。本文的试验已经取得了初步的富氧效果,但还要通过对磁致富氧装置的改进来获得更高氧浓度的富氧空气,使之能够用于富氧燃烧。
【Abstract】 Theoretical analysis and experimental results show that the continuous and even rising liquid film can form by using a horizontal metallic mesh tube when it is heated, and this rising liquid film can strengthen the heat and mass transfer. In this article, a micro-combustor of 2KW out-put based on rising film formed by horizontal metallic mesh tube was developed and an experimental test bed was established, and oxygen-enriched combustion experiments were also done.Experimental results show that the micro-combustor based on rising film formed by horizontal metallic mesh tube has good working performance. Its fuel evaporation device is very simple and the evaporation capacity can be easily adjusted by changing length and diameter of the metallic mesh tube. This micro-combustor can provide rapid fuel evaporation and homogeneous mixture formation, so it has high combustion efficiency and low pollutant emission.Oxygen-enriched air was used in the combustion experiments, and the results show that oxygen-enriched combustion has higher combustion efficiency and higher temperature than the conventional combustion. Besides, oxygen-enriched combustion enhanced the heat transfer in the combustion chamber, so it has lower pollutant emission and better working performance.The CFD simulation based on FLUENT of micro-combustor reflects the actual combustion process very well, and it contributes a lot to the performance analysis and structure improvement of the combustor.Besides, in order to find a simple way of obtaining oxygen-enriched air, theoretical and experimental studies on oxygen enrichment by using gradient magnetic field were done and oxygen-enriched air generated from the corresponding experiment. Higher concentration oxygen-enriched air can be obtained by improving the oxygen enrichment device.