基于开缝钝体的稳燃性能优化

发布时间：2017-12-27 10:29

本文关键词：基于开缝钝体的稳燃性能优化　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：低热值煤粉发电在我国占有相当大的比重,但是低热值煤粉往往很难实现稳定燃烧,因此出现了各种各样的燃烧器以适应低热值煤粉。华中科技大学研制的开缝钝体燃烧器是其中优秀的代表,《国家能源局关于促进低热值煤发电产业健康发展的通知》要求低热值煤发电项目应以煤矸石、煤泥、洗中煤等低热值煤为主要燃料,对低热值煤粉提出了更高的要求,本文在开缝钝体燃烧器的基础上,进行修改,提高其稳燃性能。本文通过对开缝钝体燃烧器的理论公式的分析,找出几个影响稳定燃烧的因素,针对这些影响因素,对开缝钝体进行结构的调整,并对这些修改后的模型进行理论分析,理论分析的结果与开缝钝体结果对比,表明修改后,稳燃性能能够得到提升,并得出结论。对各个模型进行数值模拟,通过增加入口风速,比较各个模型的吹熄极限,并与开缝钝体进行对比。分析模型的热力场,在这些修改模型中得到一个最优的修改方案,同时和理论分析的结果对比,在理论论证和模拟分析上共同验证方案的合理性。
[Abstract]:Low calorific value pulverized coal power generation accounts for a large proportion in China, but low calorific value pulverized coal is often difficult to achieve stable combustion. Therefore, various burners have been produced to adapt to low calorific value pulverized coal. The burner developed by Huazhong University of Science and Technology is one of the best representatives, the "notice" on the national energy board to promote the healthy development of low calorific value coal power industry requirements of low calorific value coal power project in coal gangue, coal slime, coal washing and low calorific value coal as the main fuel of low calorific value, put forward higher requirements for the pulverized coal. Based on the modified slotted bluff body burner, and improve the combustion stability. This paper through the theoretical formula of the burner, and find out the factors affecting the stability of combustion, in view of these factors, the structure adjustment of the slitted bluff body, and the modified model of theoretical analysis, comparing the results of theoretical analysis and the results show that the modified slitted bluff body, and stable combustion performance can be improved, and draws a conclusion. Numerical simulation of each model, by increasing the entrance velocity, blow out limit comparison of each model, and compared with the slitted bluff body. The thermodynamic field of the model is analyzed, and an optimal modification plan is obtained in these modified models. At the same time, compared with the theoretical analysis results, the rationality of the scheme is verified by theoretical argumentation and simulation analysis.
【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】：TM611

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