正丁烷高温着火延迟期的实验与数值模拟研究  

Experimental and Numerical Simulation of n-Butane Ignition Delay at High Temperature

作　　者：任君朋 Ren Junpeng(State Key Laboratory of Chemical Safety,Shandong,Qingdao,266104;SINOPEC Research Institute of Safety Engineering Co.,Ltd.,Shandong,Qingdao,266104)

机构地区：[1]化学品安全全国重点实验室,山东青岛266104 [2]中石化安全工程研究院有限公司,山东青岛266104

出　　处：《安全、健康和环境》2023年第10期49-54,共6页Safety Health & Environment

摘　　要：由于正丁烷高温转化制顺酐工艺涉及高温高压等操作条件,量化正丁烷反应混合气在反应器中的安全停留时间,是保证其安全转化的前提。通过自主建设的高温高压燃爆测试平台,测定了正丁烷在不同温度、压力下的着火延迟时间。研究发现,温度与压力越高,着火延迟时间越短。更值得注意的是,正丁烷在500~618℃温度范围内,温度越高,着火延迟时间越长,且具有明显负温度效应现象。通过CHEMKIN软件对正丁烷燃烧反应路径进行分析,发现正丁烷出现负温度效应的原因是由于产生的丁基过氧自由基导致低温链支化,抑制了主链反应路径的发展。研究结果有助于深入理解正丁烷自燃机理,指导正丁烷高温转化工艺的安全设计与爆炸防控。Since the process of high temperature conversion of n-butane to maleic anhydride involves operating conditions such as high temperature and high pressure,quantizing the safe residence time of n-butane reaction mixture in the reactor is the premise of ensuring its safe conversion.The ignition delay time of n-butane at different temperatures and pressures was measured by using the self-built high temperature and high pressure explosion test platform.It was found that the higher the temperature and pressure,the shorter the ignition delay time.It was worth noting that n-butane in the temperature range of 500~618℃,the higher the temperature,the longer the ignition delay time,and had an obvious negative temperature effect phenomenon.Through the analysis of n-butane combustion reaction path by CHEMKIN software,it was found that the negative temperature effect of n-butane was due to the low temperature chain branching caused by the generated butyl peroxy radical,which inhibited the development of the main chain reaction path.The results are helpful to further understand the mechanism of spontaneous combustion of n-butane,and guide the safety design and explosion prevention of n-butane high-temperature conversion process.

关 键 词：正丁烷 着火延迟时间 快压机 数值模拟 自燃 

分 类 号：X937[环境科学与工程—安全科学]