城市排水有限空间爆炸性气体产生机理与防治对策

易燃性气体爆炸是城市排水系统时有发生的一类有限空间事故,而人们通常更多的只关注有限空间中毒窒息事故,对该类事故关注度不够。通过分析城市排水系统涉及的有限空间和易于产生的爆炸性气体种类与危害性,阐述了防范该类事故的必要性和意义。同时,通过将沼气发酵机理与城市排水系统有限空间易于具备的条件进行对比,说明了城市排水系统有限空间爆炸性气体产生的过程与机理以及爆炸产生的危害。最后针对城市排水的特点与爆炸性气体的产生过程与机理,提出了相应的防治对策,为有效控制和减少该类事故的发生提供了技术支持。

Generating mechanism and control countermeasures of explosive gas in urban drainage limited space

Inflammable gas explosion is one kind of confined space accidents which happened a lot in urban drainage system.However,people usually tend to focus only on confined space poisoning,while ignore the inflammable gas explosion.Through the analysis of the possible confined space in the urban drainage system and the exhibition of the different explosive gas species and their hazards,the necessity and significance of preventing these kinds of accidents were elucidated.Meanwhile,through comparing biogas fermentation mechanism with the properties of the confined spaces in the urban drainage system,how the explosive gases were produced in the confined space and the mechanisms for the confined space gas explosion were illustrated.Finally,the methods to prevent this kind of accidents were proposed and the technology supports to control and decrease this kind of accidents were provided.