摘要
利用热天平（50～1100℃1分别研究了硼粉在空气、CO2、N2和O2四种不同气氛下的燃烧特性，同时研究了粒度对着火温度的影响。采用Doyle单曲线积分法模型计算硼在不同气氛下的热反应动力学参数。试验结果表明，在50～1100℃，硼在CO2气氛下增重量最大，在O2气氛中的增重速率最大，而在N2气氛下未见明显增重；硼在空气、O2和CO2气氛下的着火温度分别为710，697，770℃，提高氧浓度有利于促进硼的着火。硼粉着火温度随粒径的增大略微升高。通过计算硼在空气、O2和CO2气氛下的反应动力学参数可知，硼在以上气氛中的反应均属于二阶反应，CO2气氛下硼的反应速率常数最小。燃烧产物分析表明硼在空气气氛下与O2反应为主导反应，而基本不与N2发生反应。
In order to investigate the combustion characteristics of boron in air, CO2, N2 and O2 respectively, experiments were carried out with a high-temperature thermal balance at 50～1 100 ℃. Effect of particle size on the ignition temperature of boron was also studied. The single-curve model of Doyle integral method was adopted to calculate the kinetic parameters of the thermal reaction of boron under different atmosphere. The results show that the weight gain rate of boron in O2 is highest. The weight gain in CO2 is the most and least in N2 on the contrary. The ignition temperature of boron in air, O2 and CO2 is 710, 697, 770℃ respectively, which leads to the conclusion that increasing oxygen concentration can notably improve the ignition of boron. The ignition temperature increases slightly with the increasing of particle size. According to the kinetic calculation, the reaction of boron in air, O2 and CO2 are all belong to second order reaction and the rate constant in CO2 is the minimum. The analysis of combustion products shows that the reaction between boron and O2 is the dominant reaction in air.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2012年第29期59-65,I0009,共8页
Proceedings of the CSEE
基金
国家自然科学基金资助项目(51106135)
中国博士后科学基金资助项目(20110491769)~~
关键词
硼
热分析
燃烧
动力学
气氛
boron
thermal analysis
combustion
kinetics
atmosphere
