摘要
通过爆炸极限测试装置测定二氯甲烷在常压空气中的爆炸极限,结果表明二氯甲烷在常压下,室温~120℃内不存在爆炸极限。考察温度、压力及氧氮混合气中氧含量对二氯甲烷爆炸极限的影响,结果表明:温度对二氯甲烷爆炸极限几乎没有影响;随着压力的增大,二氯甲烷爆炸下限没有变化,但爆炸上限变化较为明显;随着氧气浓度的增大,二氯甲烷爆炸下限有较小幅度变化,但爆炸上限变化幅度较大;绘制了二氯甲烷在常温常压下的爆炸极限三元图,得到该工况条件下“二氯甲烷-氧气-氮气”混合体系的燃爆区域,极限氧含量为17.8%(相当于含氧量22.1%的氧氮混合气)。因此在工业生产过程中降低体系的压力及氧气含量有助于预防二氯甲烷燃爆危险的发生。
In this paper,the explosion limits of dichloromethane at atmospheric air were measured by an explosion limits device.The results showed that there was no explosion limits of dichloromethane from room temperature to 120℃.The effect of temperature,pressure and the oxygen concentration of oxygen and nitrogen mixture on the explosion limits of dichloromethane were investigated.The research showed that the temperature had little effect on the explosion limits of dichloromethane.With the increase of pressure,the lower explosion limit of the dichloromethane did not change,but the variation of the upper explosion limit was obvious.With the increase of oxygen concentration,the lower explosion limit of dichloromethane had a small change,but the change of the upper explosion limit was large.The explosion ternary diagrams of“dichloromethane-oxygen-nitrogen”at atmospheric temperature and pressure was drawn,and the limiting oxygen concentration of“dichloromethane-oxygen-nitrogen”was 17.8%(amount to the oxygen concentration was 22.1%in the mixture of oxygen and nitrogen).Therefore,reducing the pressure and oxygen concentration of the system during industrial production can help prevent the explosion of dichloromethane.
作者
霍明甲
张䶮
王双全
吴保意
Huo Mingjia;Zhang Yan;Wang Shuangquan;Wu Baoyi(SINOPEC Research Institute of Safety Engineering,Shandong,Qingdao,266071;National Registration Center for Chemicals,Ministry of Emergency Management,Shandong,Qingdao 266071)
出处
《安全、健康和环境》
2019年第10期43-46,共4页
Safety Health & Environment
关键词
二氯甲烷
爆炸极限
三元图
高温
高压
极限氧含量
dichloromethane
explosion limit
explosion ternary diagram
high temperature
high pressure
limiting oxygen concentration
