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利用热天平(50~1100℃)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50~1 100℃,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。
The combustion characteristics of boron powder in four different atmospheres of air, CO2, N2 and O2 were studied respectively by means of thermobalance (50 ~ 1100 ℃). The effect of particle size on the ignition temperature was also studied. The Doyle single-curve integration method was used to calculate the thermal reaction kinetics parameters of boron under different atmospheres. The experimental results show that the maximum weight gain of boron in CO2 atmosphere and the maximum weight gain rate in O2 atmosphere at 50-1 100 ℃, while no significant weight gain in N2 atmosphere. Boron in air, O2 and CO2 atmosphere The ignition temperature of 710,697,770 ℃, respectively, to improve oxygen concentration is conducive to promoting the ignition of boron. Boron powder ignition temperature increases slightly with increasing particle size. By calculating the reaction kinetics parameters of boron in the atmosphere of air, O2 and CO2, the reaction of boron in the above atmosphere belongs to the second order reaction, and the reaction rate constant of boron is the minimum in CO2 atmosphere. Analysis of the combustion products showed that the reaction of boron with O2 was the dominant reaction in the air without reacting with N2.