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以CO_2为对象,通过敞开空间水幕稀释阻挡CO_2扩散试验,分析了CO_2泄漏时的体积分数分布,对水幕稀释阻挡非水溶性重气扩散的影响因素进行了无量纲分析,主要针对泄漏源高度、泄漏源距水幕距离、水幕流量及泄漏流量进行研究,通过研究各影响因素推出了无量纲准数及水幕的稀释效率。定义了两个无量纲量:无量纲流量K=Q/q和无量纲距离Ω=H/L。结果表明:K不变时,随泄漏流量增大,水幕后CO_2的体积分数变大。泄漏流量相同时,测试点处CO_2体积分数随K增大而减小。泄漏流量每增加1 m3/h,为保持水幕后CO_2的体积分数不变,K需要增加0.25。当越接近0.6时,水幕后CO_2的体积分数越小,稀释效果越好。最后,基于无量纲分析结果,针对非水溶性重气泄漏扩散现场,提出了水幕设置建议。
Taking CO_2 as an example, the CO_2 diffusion test was carried out by diluting open space water curtain. The volume fraction distribution of CO_2 leakage was analyzed, and the influencing factors of water - Height, the distance between the leak source and the water curtain, the water curtain flow rate and the leakage flux were studied. Based on the various influencing factors, the dimensionless calibration number and the dilution efficiency of the water curtain were introduced. Two dimensionless quantities are defined: the dimensionless flow K = Q / q and the dimensionless distance Ω = H / L. The results show that when K is constant, the volume fraction of CO_2 after water curtain increases with the increase of leakage flow rate. At the same leakage flow rate, the CO_2 volume fraction decreases with increasing K at the test point. For each additional 1 m3 / h of leakage flow, K needs to be increased by 0.25 in order to keep the volume fraction of CO2 after water curtain constant. When the closer to 0.6, the smaller the volume fraction of CO_2 after water curtain, the better the dilution effect. Finally, based on the results of dimensionless analysis, aiming at the scene of non-water-soluble heavy gas leakage diffusion, a proposal of water curtain setting is proposed.