蓄热式燃烧实验及在隧道窑应用研究

发布时间：2018-01-09 05:04

本文关键词：蓄热式燃烧实验及在隧道窑应用研究　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：蓄热式燃烧技术同时又被称为高温低氧燃烧技术,由于其突出的烟气余热回收利用能力、低NOx及CO2排放特点,成为当下节能减排的一个热点,同时又能预热助燃空气,提高设备的燃烧效率,扩大燃料可用范围。本文首先对蓄热式燃烧的原理、燃烧特性、国内外研究以及应用现状进行阐述,重点是对实验的相关研究,研究了影响蓄热式燃烧系统运行效果的主要因素,得出点火枪的火焰稳定性、系统换向周期、蓄热体的蓄热和释热性能等是影响系统运行过程中稳定性、高效性的主要因素。通过重点研究点火枪点火性能、蓄热体蓄热、释热性能以及系统换向周期的选取,得出空燃比K为12、过量空气系数a为1.2、天然气量为2.5 L/min时,点火枪的火焰特性达到了工程应用的理想状态,空气和天然气的比例、空气过量程度、气体初始温度等是影响火焰的稳定性(火焰长度和刚度)的主要因素,而换向周期的确定则由点火枪的火焰稳定性、燃烧室体积,烟气温度,烟气量,蓄热体体积等因素影响,同时由于换向周期的不同影响着蓄热体的蓄热能力和释热能力,也影响到空气预热的效果,因此需要从理论分析和实际生产相结合来确定合适的换向周期。最后通过耗能分析和理论计算,分析蓄热式燃烧技术在隧道窑应用的可行性,为蓄热式燃烧技术的进一步推广和应用做准备。通过实验台架的搭建、安装、调试,到实验各项的逐步完成,最后到系统整体成功运行结束,有效通过实验验证系统及其各部件的稳定性、高效性,探究了主要影响因素,为其工程应用做好坚实的理论和实验基础。
[Abstract]:Regenerative combustion technology is also known as high temperature and low oxygen combustion technology. Because of its outstanding waste heat recovery ability, low NOx and CO2 emissions, it has become a hot spot of energy saving and emission reduction. At the same time, it can preheat the combustion air, improve the combustion efficiency of the equipment and expand the range of fuel availability. Firstly, the principle, combustion characteristics, domestic and international research and application status of regenerative combustion are described in this paper. The main factors influencing the operation effect of regenerative combustion system are studied, and the flame stability and system commutation period of the ignition gun are obtained. The heat storage and heat release performance of the regenerator are the main factors that affect the stability and efficiency of the system. When the heat release performance and the cycle of the system are selected, the air-fuel ratio K is 12, the excess air coefficient a is 1.2, and the natural gas quantity is 2.5 L / min. The flame characteristics of the igniter reach the ideal state of engineering application. The ratio of air to natural gas, the degree of excess air and the initial temperature of gas are the main factors affecting the flame stability (flame length and stiffness). However, the determination of commutation period is influenced by the flame stability, combustion chamber volume, flue gas temperature, flue gas volume, heat storage volume and so on. At the same time, the heat storage capacity and heat release ability of the regenerator are affected by the different commutation periods, and the effect of air preheating is also affected. Therefore, it is necessary to combine theoretical analysis with practical production to determine the appropriate commutation period. Finally, through energy dissipation analysis and theoretical calculation, the feasibility of the application of regenerative combustion technology in tunnel kiln is analyzed. Preparation for the further promotion and application of regenerative combustion technology. Through the construction, installation, debugging of the experimental bench, to the gradual completion of the experimental items, and finally to the successful operation of the system as a whole. Through the experiment to verify the stability and efficiency of the system and its components, the main influencing factors are explored, and a solid theoretical and experimental basis for its engineering application is established.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TK16

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