干水材料对小麦淀粉火焰抑制的研究
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摘要
为探究干水材料对淀粉云燃烧的抑制性能,采用小尺寸竖直管道燃烧系统和高速摄影仪系统进行试验。通过分析小麦淀粉云火焰形态、火焰温度及火焰传播速度的变化,研究干水材料对不同质量浓度的小麦淀粉云燃烧的抑制机制及抑制效果。研究表明:干水材料的惰化抑制主要表现为干水材料中水的汽化吸热作用和疏水性气相纳米二氧化硅的隔热作用;干水材料能减弱小麦淀粉云火焰的传播速度,降低火焰的最高温度;干水材料的抑制效果随粉尘云质量浓度的增高先提升后降低,当粉尘云质量浓度为400 g/m~3时,抑制效果最好。
To explore the starch cloud combustion inhibition effects and inhibition mechanism of dry water materials a kind of dry water material was prepared from white carbon,and experiments were carried out by using a small-scale vertical pipe experiment system and a data acquisition system. Effects of the dry water material were studied on flame morphology,flame temperature,and flame propagation speed of wheat starch cloud. The experimental results show that the dry water material can reduce both the maximum flame temperature and the maximum propagation speed of wheat starch flame,that the mainly physical inhibition by the dry water material is the vaporization of the water from the dry water material and the heat insulation of hydrophobic silica particles with nanometer dimensions,that the inhibition effect of dry water material increases firstly and then decreases slightly with the increasing of wheat starch dust concentration,and that the optimal effect is obtained when the mass concentration of starch is 400 g/m~3.
To explore the starch cloud combustion inhibition effects and inhibition mechanism of dry water materials a kind of dry water material was prepared from white carbon,and experiments were carried out by using a small-scale vertical pipe experiment system and a data acquisition system. Effects of the dry water material were studied on flame morphology,flame temperature,and flame propagation speed of wheat starch cloud. The experimental results show that the dry water material can reduce both the maximum flame temperature and the maximum propagation speed of wheat starch flame,that the mainly physical inhibition by the dry water material is the vaporization of the water from the dry water material and the heat insulation of hydrophobic silica particles with nanometer dimensions,that the inhibition effect of dry water material increases firstly and then decreases slightly with the increasing of wheat starch dust concentration,and that the optimal effect is obtained when the mass concentration of starch is 400 g/m~3.
引文
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[2]张海洲,齐志高.粉爆之灾,警钟长鸣:“2.24”淀粉粉尘爆炸事故的原因、过程及教训[J].粮食流通技术,2010(2):24-28.ZHANG Haizhou,QI Zhigao.Disaster of dust explosion,the alarm sounds continuously:the cause process and lessons of"2.24"starch dust explosion accident[J].Grain Distribution Technology,2010(2):24-28.
[3]曹卫国,潘峰,徐森,等.小麦淀粉粉尘爆炸特性参数的研究[J].安全与环境学报,2012,12(2):213-216.CAO Weiguo,PAN Feng,XU Sen,et al.On the characteristic parameters of wheat starch dust explosion[J].Journal of Safety and Environment,2012,12(2):213-216.
[4]李恩科.粮食粉尘爆炸过程分析及泄爆面积的计算[J].工业安全与环保,2008,34(3):33-35.LI Enke.Analysis of grain dust explosion process and calculation of explosion venting area[J].Industry Safety and Environmental Protection,2008,34(3):33-35.
[5]贾玉涛.面粉企业粮食粉尘爆炸及防治[D].沈阳:东北大学,2011.JIA Yutao.Gain dust explosion and its protection in flour plant[D].Shenyang:Northeastern University,2011.
[6]陈晓坤,蔡灿凡,肖旸,等.外部条件对玉米淀粉粉尘爆炸特性的影响[J].安全与环境学报,2017,17(4):1 327-1 330.CHEN Xiaokun,CAI Canfan,XIAO Yang,et al.Effect of external conditions on the explosion characteristic features of the corn starch dust[J].Journal of Safety and Environment,2017,17(4):1 327-1 330.
[7]GIERAS M.Studies on process of dust explosion suppression by water spray[J].Archivum Combustionis,2011,31(1/2):63-67.
[8]SALEH K,FORNY L,GUIGON P,et al.Dry water:from physico-chemical aspects to process-related parameters[J].Chemical Engineering Research and Design,2011,89(5):537-544.
[9]梁华杰.干水的性能及水合物储气研究[D].广州:华南理工大学,2010.LIANG Huajie.Study on the properties and gas hydrate of dry water[D].Guangzhou:South China University of Technology,2010.
[10]CARTER B O,WANG Weixing,ADAMS D J,et al.Gas storage in“dry water”and“dry gel”clathrates[J].Langmuir the Acs Journal of Surfaces&Colloids,2010,26(5):3 186-3 193.
[11]贺拥军.一种灭火剂:中国,CN103007479A[P].2013-04-03.
[12]贺娟.新型干水灭火剂的研究[D].西安:西安科技大学,2014.HE Juan.Research on new dry water extinguishing agent[D].Xi'an:Xi'an University of Science and Technology,2014.
[13]丁以斌,孙金华,何学超,等.锆粉尘云的火焰传播特性[J].燃烧科学与技术,2010,16(4):353-357.DING Yibing,SUN Jinhua,HE Xuechao,et al.Flame propagation characteristic of zirconium particle cloud[J].Journal of Combustion Science and Technology,2010,16(4):353-357.
[14]宫捷,汪泉,李志敏,等.柱形爆炸容器内爆炸冲击波的传播规律研究[J].爆破,2017,34(4):17-21.GONG Jie,WANG Quan,LI Zhimin,et al.Research on propagation law of explosive shock wave in cylindrical explosion containment vessel[J].Blasting,2017,34(4):17-21.
[15]张猛,俞森彬,金武,等.预混湍流3D火焰面密度和燃料消耗率的估计[J].工程热物理学报,2015,36(7):1 578-1 583.ZHANG Meng,YU Senbin,JIN Wu,et al.Experimental study on turbulent premixed flames of syngas oxyfuel mixtures at high pressure with OH-PLIF[J].Journal of Engineering Thermophysics,2015,36(7):1 578-1 583.
[16]崔洪梅,刘宏,王继扬,等.纳米粉体的团聚与分散[J].机械工程材料,2004,28(8):38-41.CUI Hongmei,LIU Hong,WANG Jiyang,et al.Agglomeration and dispersion of nano-scale powders[J].Materials for Mechanical Engineering,2004,28(8):38-41.
[17]程方明,邓军,罗振敏,等.硅藻土粉体抑制瓦斯爆炸的实验研究[J].采矿与安全工程学报,2010,27(4):604-607.CHENG Fangming,DENG Jun,LUO Zhenmin,et al.Experimental study on inhibiting gas explosion using diatomite powder[J].Journal of Mining and Safety,2010,27(4):604-607.
[18]陈先锋,张洪铭,陈曦,等.小麦淀粉粉尘云火焰传播特性研究[J].中国安全科学学报,2016,26(12):53-57.CHEN Xianfeng,ZHANG Hongming,CHEN Xi,et al.Study on propagation characteristics of wheat starch dust cloud flame[J].China Safety Science Journal,2016,26(12):53-57.