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Thesis Advisor李佑楚
Degree Grantor中国科学院研究生院
Abstract本文在鼓泡流化床和快速循环流化床两种不同结构燃烧反应器中研究了粒径为0.294毫米~3.5毫米的大同烟煤。床温为973K ~1173K流化速度为0.86米/秒~4.06米/秒时的燃烧情况。由微机实时采样系统和CO_2 红外气体分析仪,对煤燃烧产生的烟气中的CO_2浓度进行实时测量。通过微机数据处理,拟合计算出化学反应速度常数k_c、反应级数n,并由此得到燃烧动力学模型。在此基础上,结合快速流化床流动模型和传递模型,可以为建立统一的快速流化床燃烧反应器的数水模型提供依据。实验结果表明,燃烧反应为一级反应;化学反应速度常数为: k_c = 1.167exp(-26812/RT_p) [m/s]在流化速度U < 1 [m/s]的流化床中,燃烧似为扩散和动力学联合控制过程;在U > 2 [m/s]时,似为动力学控制过程。在U = 2.8 ~ 4.1 [m/d]的快速循环床中,燃烧反应似为动力学控制过程。
Other AbstractCombustion of coal particles of diameter from 0.294 mm to 3.5 mm in both bubbling fluidized bed and fast fluidized bed has been researched. The exhaust gas was analysed for carbon dioxide using an infra-red analyser. With the help of computer data process system, chemical reaction rate constant k_c and reaction order n were calculated and the combustion kinetic model has been obtained. The result showed that the combustion was first order reaction under the experimental conditions. The chemical reaction rate constant showed to be: k_c = 1.167 exp (-26812/RT) [m/s]. Combustion model for fast fluidized bed coal combustors can be established based on the models of combustion, fluid dynamics, and heat and mass transfer.
Document Type学位论文
Recommended Citation
GB/T 7714
罗国新. 快速流态化燃烧大同煤反应速度的研究[D]. 中国科学院研究生院,1990.
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