摘要
为了保证浸没燃烧式液化天然气(liquefied nootural gas,LNG)气化器运行过程中燃烧火焰的稳定性,借鉴扩散燃烧火焰稳定性理论研究的结论,结合流体力学和化学反应方程,分析了实验装置的特性并进行相关实验。结果表明:火焰不稳定性的原因是燃烧室内压力波动幅度过大,分析得到得实现稳定燃烧的压力波动范围为-15%^+15%,过剩空气系数越大,压力波动对火焰稳定性的影响越明显,最终导致脱火或者熄火。以实验台为原型,进行数值模拟,验证了实验结果,并对实验装置进行了气体回流方面的改进。
In order to ensure the stability of combustion flame in the running process of liquefied natural gas submerged combus-tion vaporizer, Referring to the conclusion of diffusion combustion flame stability theory and combining with the equations of hy-drodynamics and chemical reaction, the characteristics of the experimental device were analyzed and the related experiments were carried out. The results show that the flame instability is caused by the excessive pressure fluctuation in the combustion chamber and the pressure fluctuation range of stable combustion are obtained. The greater the excess air coefficient is,the influence of the pressure fluctuation on the flame stability is more obvious,which eventually leads to the removal of fire or flame. On the experi-mental platform the numerical simulation is carried out, which validates the experimental results and the improvement of gas re-flux in the experimental device has been carried out.
出处
《中国科技论文》
北大核心
2017年第5期564-569,共6页
China Sciencepaper
基金
北京市科学技术委员会资助项目(D151100005515002)
关键词
扩散火焰
火焰稳定性
压力波动
实验研究
数值模拟
diffusion flame
flame stability
back pressure fluctuations
experimental study
numerical simulation
