N_2/CO_2气氛对CO/H_2爆燃特性的影响  

Influence of N_2/CO_2 on Deflagration Characteristics of CO/H_2

作　　者：刘原一[1] 朱轶铭 熊英莹[1] 王学斌[1] 谭厚章[1] 

机构地区：[1]西安交通大学热流科学与工程教育部重点实验室,西安710049

出　　处：《燃烧科学与技术》2014年第5期383-387,共5页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51376147;51306142)

摘　　要：炉膛冷灰斗区域可能形成局部高浓度的CO/H2混合气,高温焦块落入就可能引起爆燃.通过试验研究了冷灰斗区域N2、CO2氛围对CO、H2爆燃下限以及CO-H2混合气爆燃超压和压力波传播速度的影响.结果表明,随着混合气中CO2浓度从0增加到18%,CO爆燃下限几乎呈线性关系从18.3%上升到31.0%,H2的爆燃下限以相同的规律从11.0%上升到16.3%,在该CO2浓度范围内,CO-H2混合气的爆燃峰值从111.8,kPa下降到60.4,kPa,压力波传播速度明显降低,但仍高于420,m/s;混合气中CO/H2比越高,混合气爆燃强度越弱.相同环境下,CO2对CO-H2混合气爆燃特性的影响强于N2.High-concentration CO/H2 mixture may be formed in the cold hopper area of local boiler. Deflagration would be caused if there are some high temperature cokes droping into the dangerous area. The influence of N2,CO2 concentration on lower deflagration limit（LDL）of CO and H2,deflagration overpressure of CO/H2 mixture and its propagation velocity were studied. The results indicate that with the added volume concentration of CO2 rising from 0 to 18%,the LDL of CO rises from 18.3% to 31.0% nearly linearly,and the LDL of H2 rises from 11.0% to 16.3%with the same regularity. The overpressure of CO/H2 deflagration peak decreases from 111.8,kPa to 60.4,kPa within the same CO2 concentration range. The propagation velocity decreases sharply,but it is always higher than 420,m/s.The higher the molar ratio of CO/H2 is,the weaker the deflagration overpressure is. The inhibiting effect of CO2 is more powerful than that of N2 under the same condition.

关 键 词：爆燃 炉膛 一氧化碳 氢气 抑爆 

分 类 号：O381[理学—流体力学]