多元可燃性气体爆炸压力与中间产物发射光谱特性的耦合研究

Coupling research on explosion pressure of multi-component combustible gas and emission spectrum characteristics of intermediate products

工业生产中爆炸事故往往是由多元可燃气体与空气混合后遇到明火而引起的,为研究乙烷(C 2 H 6)、乙烯(C 2 H 4)、一氧化碳(CO)、氢气(H 2)对甲烷爆炸特性的影响,选取多组分可燃气体甲烷爆炸压力特性和自由基发射光谱的影响进行研究,利用陕西省工业过程安全与应急救援工程技术研究中心重点实验室搭建的多功能球形气体/粉尘爆炸实验装置和单色仪进行爆炸实验测试,同步采集时间—压力曲线、中间产物(OH,CH 2 O)的发射光谱信号,考察多组分可燃气体浓度对甲烷爆炸压力特性和中间产物的影响。结果表明:在富氧状态下,多组分可燃气体加剧了甲烷—空气混合体系的爆炸剧烈程度,随着体系中氧气含量的减少、由富氧状态变为贫氧状态、促进作用逐渐减弱转变为阻尼作用,爆炸压力特性与中间产物发射光谱参数的影响规律基本保持一致,均呈高度正相关;多元混合体系爆炸剧烈程度越大,自由基发射光谱达到峰值的速度越快,自由基更早、更快的积累是加剧爆炸程度的原因之一。

The explosion accidents in the industrial production are often caused by the mixture of multi-component combustible gas and air being ignited by the open fire.In order to study the influence of ethane(C 2H 6),ethylene(C 2H 4),carbon monoxide(CO)and hydrogen(H 2)on the explosion characteristics of CH 4,the multi-component combustible gas was selected to study the influence on the explosion pressure characteristics and free radicals emission spectrum of CH 4.The multi-function spherical gas/dust explosion experimental device developed by the Shaanxi Engineering Research Center for Industrial Process Safety&Emergency Rescue and the monochromator were used to conduct the explosion experimental tests,then the time-pressure curves and the emission spectrum signals of intermediate products(CH 2O,OH)were synchronously collected,and the influence of the concentration of multi-component combustible gas on the explosion pressure characteristics and intermediate products of CH 4.The results showed that under the oxygen-rich state,the multi-component combustible gas intensified the explosion intensity of methane-air mixture system.With the decrease of oxygen content in the system,the oxygen-rich state became the oxygen-poor state,and the promoting effect gradually weakened and converted into the damping effect.The influence laws of explosion pressure characteristics and emission spectrum parameters of intermediate products were basically consistent,both presenting the high-positive correlation.The greater the explosion intensity of multi-component mixture system,the faster the emission spectrum of free radicals reached the peak.The earlier and faster accumulation of free radicals was one of the reasons for intensifying the explosion intensity.