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研究了在各种不同工况下，尿素装置的放空尾气中爆炸性气体组分的变化趋势以及爆炸性区域和爆炸极限的计算；从增加 NH3或增加蒸汽含量等方面，研究了爆炸性气体组分迁移至非爆炸性区域的方法。“,”Author has researched the varying trend for explosive gas component in venting tail gas of urea plant under a variety of different operation conditions and the calculations of explosive area and explosive limit ; has also researched the method taking the explosive gas moving towards non-explosive area from aspects of increasing ammonia or steam content etc.