摘要
通过室外水幕抑制阻挡CO2扩散试验分析了CO2泄漏时的体积分数分布,探讨了水幕压力、水幕到泄漏源距离、泄漏源高度对水幕抑制阻挡重气云扩散能力的影响,得到了不同初始条件下的水幕稀释效率。结果表明:水幕压力越大,抑制效果越好;泄漏源到水幕的距离较近时,CO2容易穿透水幕;泄漏高度低于水幕高度时,泄漏高度越高,水幕抑制效果越差。在此基础上得出了扇形水幕抑制阻挡重气云扩散机理,即向上喷射的扇形水幕是通过垂直向上的机械趋散作用、空气卷吸等将重气向上驱散,从而达到抑制阻挡非水溶性重气的目的。
The present paper has chosen its research topic in how to restrain and prevent the carbon dioxide diffusion with the water currain spreading in the open space, in which we have done an analysis of the leakage source of the carbon dioxide. At the same time, we have also made a discussion of the effects of the pressure of the water curtain, the distance between the water curtain and the leakage source as well as the leakage source height on the strength of restraining heavy gas diffusion. While studying such problems, we have ob- tained the dilution efficiency of the water curtain under different initial conditions on the basis of the above-mentioned facts. Thus, through experiments we have arrived at the conclusion that the greater pressure the water curtain has, the bigger momentum the drops would gain, and in turn the more air turbulence tend to bring in when the drops defuse and cause the movement of the air turbulence. In doing so, the stronger the drops of the disperse air are, the better the dilution effect will be produced, so that the closer the distance between water curtain and the leakage source, the bigger momentum the carbon dioxide will gain, and in that situation, the mechanical effect that the water curtain owns would perhaps be too weak to push the carbon dioxide upward. And, if so, the carbon dioxide is likely to penetrate into the water curtain promptly. When the situation turns to be such, the result would be： the higher the leakage spot within the height of the water curtain is, the worse the mechanical effect in the vertical direction will be, and the worse air entrainment will become with the worsening dilution effect. On this basis, it can be concluded that the diffusion mechanism of restraining and obstructing the heavy gas diffusion should be made so that the water curtain sector spraying upwards can disperse the heavy gas upward with the help of the air entrainment and the mechanical effect that is straight up so as to reach the goal of restraining the water-insoluble heavy gas.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2012年第4期251-254,共4页
Journal of Safety and Environment
基金
江苏省高校自然科学基金重大项目(09KJA620001)
教育部博士点基金项目(20113221120010)
江苏省科技支撑计划项目(BE2010740)
江苏省城市与工业安全重点实验室开放基金项目(2008UIS005)
关键词
安全工程
水幕
重气
敞开空间
稀释效率
safety engineering
water curtain
heavy gas
openspace
dilution efficiency
