工业场合排风口高度对泄漏氢气排除有效性的影响
摘要：以某车间为研究对象，采用数值模拟方法计算了排风口上缘距顶部距离对排除泄漏氢气与空气混合物效果的影响。研究结果表明，不同换气次数下羽流在室内的发展形态不同。当换气次数为1 h-1时，侧墙排风口上缘距离顶部0～0.7 m范围内的排污效率几乎不变，均值为1.20,而当该距离增大到0.8 m时，排污效率下降54.4%,不利于混合物的排除；当换气次数分别为1、3、6 h-1时，侧墙排风口上缘距顶部距离0.1 m左右并未出现明显的排污效率变化，这与现行规范中“用于排除氢气与空气混合物时，吸风口上缘至顶棚平面或屋顶的距离不大于0.1 m”的相关条款的指向有所不同。
关键词：氢气数值模拟排风口高度气流组织换气次数排污效率
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参考文献[1] 中国建筑科学研究院.民用建筑供暖通风与空气调节设计规范：GB 50736—2012[S].北京：中国建筑工业出版社，2012:35- 38.
[2] 中国有色工程有限公司，中国恩菲工程技术有限公司.工业建筑供暖通风与空气调节设计规范：GB 50019—2015[S].北京：中国计划出版社，2015:38- 40.
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[10] 余常昭.紊动射流[M].北京：高等教育出版社，1993:96- 107.
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[2] 中国有色工程有限公司，中国恩菲工程技术有限公司.工业建筑供暖通风与空气调节设计规范：GB 50019—2015[S].北京：中国计划出版社，2015:38- 40.
[3] 中国有色工程设计研究总院.采暖通风与空气调节设计规范：GB 50019—2003[S].北京：中国计划出版社，2004:46- 49.
[4] 孙智浩.受限空间内高压氢气泄漏的数值模拟研究[D].济南：山东大学，2019:35- 38.
[5] CARITEAU B,TKATSCHENKO I.Experimental study of the effects of vent geometry on the dispersion of a buoyant gas in a small enclosure[J].International journal of hydrogen energy,2013,38:8030- 8038.
[6] DENISENKO V P,KIRILLOV I A,KOROBTSEV S,et al.Hydrogen-air explosive envelope behavior in confined space at different leak velocities[EB/OL].[2021-07-29].http://conference.ing.unipi.it/ichs2009/images/stories/papers/194.pdf.
[7] 王晨辉.公共建筑卫生间污染物扩散及通风控制数值模拟[D].西安：西安建筑科技大学，2020:53- 57.
[8] CHUNG K C,HSU S P.Effect of ventilation pattern on room air and contaminant distribution[J].Building and environment,2001,36:989- 998.
[9] VERSTEEG H K,MALALASEKERA W.An introduction to computational fluid dynamics:the finite volume method[M].Essex:Pearson Education,2007:87- 94.
[10] 余常昭.紊动射流[M].北京：高等教育出版社，1993:96- 107.
[11] WRIGHT S J.Buoyant jets in density-stratified crossflow[J].Journal of hydraulic engineering,1984,110 (5):643- 656.
Influence of exhaust outlet height on efficiency of removing leaked hydrogen in industrial occasions
Abstract: Taking a workshop as the research object, the effect of the distance from the upper edge of the exhaust outlet to the top on removing the leaked hydrogen and air mixture is calculated by numerical simulation. The results show that the plume development patterns are different in different air change rates. When the air change rate is 1 h-1, the discharge efficiency within the range of 0-0.7 m from the upper edge of the side wall exhaust outlet to the top is almost unchanged, with an average of 1.20. When the distance is increased to 0.8 m, the discharge efficiency decreases by 54.4%, which is not conducive to the removal of the mixture. When the air change rate is 1, 3 and 6 h-1 respectively, the distance between the upper edge of the side wall exhaust outlet and the top is about 0.1 m, and there is no obvious change in the discharge efficiency. This is different from the relevant provisions of the current specifications that “when used to remove the mixture of hydrogen and air, the distance between the upper edge of the exhaust outlet and the ceiling plane or roof is not more than 0.1 m.”
Keywords: hydrogen; numerical simulation; exhaust outlet height; air distribution; air change rate; discharge efficiency;
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