The study on the special phenomenon,occurrence process and control mechanism of gasoline-air mixture thermal ignition in underground oil depots is of important academic and applied value for enriching scientific theor...The study on the special phenomenon,occurrence process and control mechanism of gasoline-air mixture thermal ignition in underground oil depots is of important academic and applied value for enriching scientific theories of explosion safety,developing protective technology against fire and decreasing the number of fire accidents.In this paper,the research on thermal ignition process of gasoline-air mixture in model underground oil depots tunnel has been carried out by using experiment and numerical simulation methods.The calculation result has been demonstrated by the experiment data.The five stages of thermal ignition course,which are slow oxidation stage,rapid oxidation stage,fire stage,flameout stage and quench stage,have been firstly defined and accurately descried.According to the magnitude order of concentration,the species have been divided into six categories,which lay the foundation for explosion-proof design based on the role of different species.The influence of space scale on thermal ignition in small-scale space has been found,and the mechanism for not easy to fire is that the wall reflection causes the reflux of fluids and changes the distribution of heat and mass,so that the progress of chemical reactions in the whole space are also changed.The novel mathematical model on the basis of unification chemical kinetics and thermodynamics established in this paper provides supplementary means for the analysis of process and mechanism of thermal ignition.展开更多
为了获得一种可用于地下油库的堵漏材料,以甲基丙烯酸甲酯和甲基丙烯酸丁酯为聚合单体、过氧化苯甲酰为引发剂、N,N-亚甲基双丙烯酰胺为交联剂、聚乙烯醇为分散剂,采用悬浮聚合法合成了一种丙烯酸酯类共聚物吸油树脂。利用正交试验等,...为了获得一种可用于地下油库的堵漏材料,以甲基丙烯酸甲酯和甲基丙烯酸丁酯为聚合单体、过氧化苯甲酰为引发剂、N,N-亚甲基双丙烯酰胺为交联剂、聚乙烯醇为分散剂,采用悬浮聚合法合成了一种丙烯酸酯类共聚物吸油树脂。利用正交试验等,研究了树脂的最佳合成条件、耐温耐盐性能和对不同油品的吸油能力。结果表明:反应温度为80℃、油水比为1:8、引发剂质量分数为1%、交联剂质量分数为2.5%、分散剂质量分数为2%时,树脂对溴乙烷的饱和吸油膨胀率达16.53 m L/m L;并发现树脂的吸油膨胀率随着温度升高、盐溶液浓度增加或浸泡时间延长都呈现逐渐减小的趋势;树脂对三氯甲烷、溴乙烷、1,2-二氯乙烷、丙酮的吸油膨胀率分别为16.07、16.53、10.42、6.12 m L/m L。展开更多
文摘The study on the special phenomenon,occurrence process and control mechanism of gasoline-air mixture thermal ignition in underground oil depots is of important academic and applied value for enriching scientific theories of explosion safety,developing protective technology against fire and decreasing the number of fire accidents.In this paper,the research on thermal ignition process of gasoline-air mixture in model underground oil depots tunnel has been carried out by using experiment and numerical simulation methods.The calculation result has been demonstrated by the experiment data.The five stages of thermal ignition course,which are slow oxidation stage,rapid oxidation stage,fire stage,flameout stage and quench stage,have been firstly defined and accurately descried.According to the magnitude order of concentration,the species have been divided into six categories,which lay the foundation for explosion-proof design based on the role of different species.The influence of space scale on thermal ignition in small-scale space has been found,and the mechanism for not easy to fire is that the wall reflection causes the reflux of fluids and changes the distribution of heat and mass,so that the progress of chemical reactions in the whole space are also changed.The novel mathematical model on the basis of unification chemical kinetics and thermodynamics established in this paper provides supplementary means for the analysis of process and mechanism of thermal ignition.
文摘为了获得一种可用于地下油库的堵漏材料,以甲基丙烯酸甲酯和甲基丙烯酸丁酯为聚合单体、过氧化苯甲酰为引发剂、N,N-亚甲基双丙烯酰胺为交联剂、聚乙烯醇为分散剂,采用悬浮聚合法合成了一种丙烯酸酯类共聚物吸油树脂。利用正交试验等,研究了树脂的最佳合成条件、耐温耐盐性能和对不同油品的吸油能力。结果表明:反应温度为80℃、油水比为1:8、引发剂质量分数为1%、交联剂质量分数为2.5%、分散剂质量分数为2%时,树脂对溴乙烷的饱和吸油膨胀率达16.53 m L/m L;并发现树脂的吸油膨胀率随着温度升高、盐溶液浓度增加或浸泡时间延长都呈现逐渐减小的趋势;树脂对三氯甲烷、溴乙烷、1,2-二氯乙烷、丙酮的吸油膨胀率分别为16.07、16.53、10.42、6.12 m L/m L。
