声波对煤粉燃烧特性的影响:研究进展与展望

Research progress and prospects on the influence of sound waves on the combustion characteristics of coal powder

  • 摘要: “双碳”目标的实现对煤炭的清洁高效利用提出了更高的要求。因此,探索煤粉新型清洁高效燃烧技术具有重要意义。声学作为一门基础性和交叉性极强的学科, 近年来已渗透到几乎所有重要的自然科学和工程技术领域。尤其在燃煤电站锅炉中,声学技术的应用受到了广泛关注和研究,如基于声学原理的炉内温度场重建、测流、泄漏检测及声波除灰、声波团聚等技术。以上声学技术的研究和应用均涉及到声波传播过程中产生的声物理和化学效应。有关声场作用下煤粉颗粒燃烧特性的研究已有诸多报道,指出利用声波的物理化学效应可以为煤粉颗粒清洁高效燃烧提供新的技术手段。声波助燃技术已被证实是一种高效节能、清洁环保的新型燃烧技术,具有较大潜力。因此,在节能减排政策的高要求下,声波助燃技术在燃煤电站锅炉中的应用推广与发展研究应当得到足够的重视。目前针对声波影响煤粉颗粒燃烧的基础理论研究尚不完善,对声波物理化学效应的作用机制阐述不清。已有的文献中对声波影响煤粉燃烧的研究鲜见专著和综述性文章介绍。鉴于此,本研究较为全面地介绍了声波影响煤粉燃烧的作用机制,分析总结了国内外声波影响煤粉颗粒燃烧的研究现状,厘清了声波影响煤粉颗粒燃烧特性的主要技术研究路线,以便系统了解声波助燃的对象、方法、原理和实际应用。

     

    Abstract: The realization of the “double carbon” goal puts forward higher requirements for the clean and efficient utilization of coal, so it is significant to explore a new clean and efficient combustion technology for pulverized coal. Acoustics, as a basic and cross-cutting discipline, has been closely related to almost all important natural science and engineering technology fields in recent years. The application of acoustic technology in power plant boilers, such as furnace temperature field reconstruction, flow measurement, leak detection, sonic soot cleaning, acoustic agglomeration and other technologies based on acoustic principle, has received extensive attention and research. Also, the research and application of the above acoustic technologies all involve the acoustic physical and chemical effects generated in the process of acoustic wave propagation. The research on the combustion characteristics of coal particles under the action of the sound field has accumulated to a certain extent. Some studies have demonstrated that the physical and chemical effects of acoustic waves, such as acoustic-assisted combustion technology, can provide new technical means for the clean and efficient combustion of coal particles. Acoustic-assisted combustion is a new combustion technology with high efficiency, energy conservation and environmental protection, and has great potential. Therefore, under the high requirements of energy conservation and emission reduction policies, the application, promotion and research of acoustic-assisted combustion technology in coal-fired power plant boilers should be paid enough attention. However, the basic theoretical research on the influence of acoustic wave on pulverized coal particle combustion is inadequate, and the explanation of the mechanism of acoustic wave physical effect is not clear enough. In the existing literature, there is neither a monograph nor a review article on the research of acoustic wave effect on pulverized coal combustion. Given this, the mechanism of acoustic waves affecting pulverized coal combustion is comprehensively introduced in this research review, and the research status of sound wave affecting pulverized coal particle combustion is analyzed and summarized. The research overview clarifies the main technical research routes of the influence of acoustic waves on the combustion characteristics of pulverized coal particles, and helps readers systematically understand the objects, methods, principles and practical applications of acoustic wave combustion support.

     

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