甲烷-空气预混区外含钾细水雾抑爆特性研究  

Study on explosion suppression characteristics of water mist containing potassium compounds outside methane-air premixed area

作　　者：王晓玲[1] 刘震起 WANG Xiaoling;LIU Zhenqi(Institute of Building Intelligence,Jiangsu Vocational Institute of Architectural Technology,Xuzhou Jiangsu 221116,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou Jiangsu 221116,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou Jiangsu 221116,China)

机构地区：[1]江苏建筑职业技术学院建筑智能学院,江苏徐州221116 [2]中国矿业大学力学与土木工程学院,江苏徐州221116 [3]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《中国安全科学学报》2024年第1期150-157,共8页China Safety Science Journal

基　　金：江苏省住建厅科技项目(2021ZD18)。

摘　　要：为了解含钾细水雾在综合管廊燃气泄漏场景下的抑爆能力,采用自制的爆炸试验系统,开展含添加剂细水雾位于甲烷-空气爆炸区域外的抑爆试验,分析纯水及草酸钾、碳酸钾、氯化钾3种含钾化合物细水雾对9.5%甲烷-空气爆炸超压与过火范围的影响。研究结果表明:纯水细水雾的临界抑爆雾化质量浓度区间为320~480 g/m^(3);含草酸钾条件下超压下降率随质量分数增加呈现正态累积分布函数(NormalCDF)变化,最佳抑爆质量分数为10%;当雾化质量浓度为480 g/m^(3)、雾滴D32为61.7μm、化合物质量分数为10%时,对应抑爆能力均大于纯水细水雾条件,其中,含草酸钾抑爆能力最强,其次为碳酸钾与氯化钾,峰值超压下降率较纯水细水雾条件分别提高2.32、1.88与1.53倍,过火范围分别缩减46.7%、40%与13.3%。相较于碳酸钾与氯化钾条件,爆炸气体预混区域外含草酸钾细水雾能够吸收更多的爆炸热量、消耗更多的活性自由基。In order to recognize the explosion suppression ability of potassium-containing fine water mist in the scenario of gas leakage in urban comprehensive pipeline corridors,the explosion suppression tests were carried out with additive-containing fine water mist located outside the methane-air explosion area by a self-made explosion experimental system.The effects of pure water and fine water mist of three potassium compounds,namely potassium oxalate,potassium carbonate and potassium chloride,on the overpressure and overfire range of 9.5% methane-air explosion were analyzed.The results indicate that the critical explosion suppression atomization concentration range of pure water mist outside the methane-air premixed area is 320-480g/m^(3).The overpressure decrease rate under potassium oxalate-containing conditions showed a trend of NormalCDF(Normal Cumulative Distribution Function)with increasing mass concentration,and the optimum suppression concentration is 10%.When the atomization concentration is 480 g/m^(3),D 32 is 61.7μm,the mass concentration of the compound is 10%,and the explosion suppression ability of water mist containing additives is greater than that of pure water mist.Among them,potassium oxalate has the strongest explosion suppression ability,followed by potassium carbonate and potassium chloride.The peak overpressure reduction rate is 2.32 times,1.88 times,and 1.53 times higher than that under pure water mist conditions,respectively.The range of overfire is reduced by 46.7%,40%,and 13.3%,respectively.Compared to potassium carbonate and potassium chloride,the potassium oxalate fine water mist outside the premixed area could absorb more heat and consume more active free radicals.

关 键 词：甲烷-空气 含钾化合物 预混区域 细水雾 抑爆 

分 类 号：X932[环境科学与工程—安全科学]