【摘要】 针对低温液化分离提纯含氧煤层气流程中的安全问题,提出了控制最低尾气出口温度、添加阻燃成分和预粗脱氧3种防止爆炸的技术手段。结合低温液化分离流程特点,利用爆炸三角形理论,分别给出了上述3种防爆措施的详细实现方法。控制最低尾气出口温度方法的核心就是通过控制液化分离流程的最低温度,将尾气浓度状态点控制在爆炸三角区上限线以上;添加燃阻成分和预粗脱氧方法的核心是:使混合物在分离过程中最可能出现进入爆炸三角区的区域(对低温分离通常在可燃气体液化分离区域)内,氧浓度降低到当地温度、压力下爆炸三角形图上以临界点和纯可燃气体点的连线及以下。基于大量文献数据,拟合出不同温度和压力下甲烷爆炸上限和下限的计算关联式。更多还原

【Abstract】 In order to ensure the security in the methane recovery process from coalbed gas with oxygen,this paper recommends three kinds of technical means: a.to control the lowest outlet gas temperature;b.to add nonflammable gases into the methane/air mixture;c.to have the fuel gas being deoxidized roughly in advance.By use of explosion triangle theory,these three technical means can be achieved as follows: a.the concentration of outlet gas will be maintained above the upper limit of explosion triangle through keeping on the lowest temperature of the whole process;b.the oxygen concentration within the explosion triangle area under local temperature and pressure will be controlled under the line connecting the upper and lower limits with flammable limits of methane/air mixture.Based on the data collected from references,this paper derived the calculation formula of upper and lower limits of methane/air mixture explosion under different temperatures and pressures.更多还原