铝粉爆炸泄放及抑制实验研究
发布时间：2018-11-09 08:38
【摘要】：导管泄放技术的研究对工业粉尘爆炸防护有着重要的意义。导管的存在会使主容器内的最大泄爆压力出现显著的增加,目前造成这种异常现象的主要因素还没有研究清楚。本文以1.3L Hartmann管为基础,对铝粉爆炸泄放及惰化和抑制实验进行了研究。 主要研究内容和结论如下： (1)改进了原有1.3L Hartmann装置,设计了不同长度和直径的导管。采用高频压力传感器测量压力,采用火焰传感器测量导管内火焰特性,采用2块8通道数据采集板进行同步采集。在此装置上进行了铝粉爆炸无管泄放、导管泄放以及惰化和抑制实验。 (2)研究了铝粉浓度、粒径以及泄爆口径对无管泄放特性影响规律,并用SPSS软件拟合得到了最大泄爆压力和最大升压速率与三种因素的定量关系式。实验发现,无管泄放时,对最大泄爆压力影响由强至弱的参数依次：为泄爆口径、铝粉粒径、铝粉浓度；对最大升压速率影响由强到弱依次为：铝粉粒径、泄爆口径、铝粉浓度。 (3)采用不同长径比的导管对铝粉爆炸导管泄放特性进行实验研究,研究了铝粉浓度、铝粉粒径、导管长径比对导管泄放特性的影响,拟合得到最大泄爆压力和最大升压速率与三种因素的量化关系式。结果表明：导管泄放时,对最大泄爆压力影响由强到弱依次为：泄爆导管长径比、铝粉粒径、铝粉浓度。 (4)实验发现,采用导管进行粉尘爆炸泄放实验时,在泄爆管内临近泄爆口处发生了铝粉二次爆炸。二次爆炸产生的原因是射流火焰在导管内将未燃铝粉点燃。研究发现,二次爆炸是导管泄放时容器内最大泄爆压力显著增大的原因之一 (5)爆炸泄放结合爆炸抑制是一种非常经济高效的粉尘爆炸防护措施,实验分别对硅酸铝棉多孔介质和碳酸钙惰性颗粒对铝粉爆炸泄放特性的影响进行了研究。实验发现,在导管内内衬硅酸铝棉多孔介质和在Hartmann管内预混一定质量浓度的碳酸钙惰性颗粒都能有效的降低导管内的二次爆炸的强度,并使Hartmann管和导管内的最大泄爆压力及火焰传播速度都出现了显著地降低。 (6)实验发现,随着碳酸钙质量浓度的增加,最大泄爆压力和最大升压速率都降低,但最大升压速率变化的更加敏感。预混碳酸钙惰性颗粒可以有效的降低爆炸指数和所需泄爆面积。
[Abstract]:The study of duct discharge technology is of great significance to the protection of industrial dust explosion. The existence of ducts can increase the maximum venting pressure in the main vessel significantly. The main factors causing this abnormal phenomenon have not been studied at present. Based on 1.3L Hartmann tube, the experiments of explosion discharge, inerting and inhibition of aluminum powder have been studied in this paper. The main contents and conclusions are as follows: (1) the 1.3L Hartmann device is improved and the conduits of different lengths and diameters are designed. The high frequency pressure sensor is used to measure the pressure, the flame sensor is used to measure the flame characteristics in the tube, and two 8 channel data acquisition boards are used for synchronous acquisition. The experiments of aluminum powder explosion without tube discharge, pipe discharge, inerting and inhibition were carried out on the device. (2) the influence of aluminum powder concentration, particle size and deflagration caliber on the discharge characteristics without tube was studied. The quantitative relationship between the maximum venting pressure and the maximum pressure rising rate and the three factors was obtained by SPSS software. The experimental results show that the parameters that influence the maximum venting pressure from strong to weak are as follows: the diameter of venting, the particle size of aluminum powder and the concentration of aluminum powder; The order of the effect on the maximum pressure rise rate is: the particle size of aluminum powder, the diameter of deflagration and the concentration of aluminum powder. (3) the effect of aluminum powder concentration, particle size and ratio of length to diameter on the discharge characteristics of aluminum powder explosive conduit was studied by using the tube with different aspect ratio. The quantitative relationship between the maximum explosion relief pressure and the maximum pressure rise rate and three factors is obtained by fitting. The results show that the influence on the maximum venting pressure is as follows: the ratio of length to diameter, the particle size of aluminum powder and the concentration of aluminum powder. (4) it is found that the secondary explosion of aluminum powder occurs in the place near the vent of the pipe when the pipe is used for the dust explosion discharge experiment. The reason for the secondary explosion is that the jet flame ignites the unburned aluminum powder in the tube. It is found that the secondary explosion is one of the reasons for the significant increase of the maximum explosion pressure in the vessel when the vessel is released. (5) the combination of explosion release and explosion suppression is a very economical and efficient protection measure for dust explosion. The effects of aluminum silicate cotton porous media and calcium carbonate inert particles on the explosion release characteristics of aluminum powder were studied. It was found that the inert particles of calcium carbonate premixed in the tube of Hartmann and the porous media lined with aluminum silicate cotton inside the tube can effectively reduce the secondary explosion strength of the tube. The maximum venting pressure and flame propagation velocity in Hartmann tubes and ducts have been significantly reduced. (6) it is found that with the increase of calcium carbonate concentration, both the maximum explosion pressure and the maximum pressure rise rate decrease, but the change of the maximum pressure rise rate is more sensitive. Premixed calcium carbonate inert particles can effectively reduce the explosion index and the required explosion area.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：X932
本文编号：2319909
[Abstract]:The study of duct discharge technology is of great significance to the protection of industrial dust explosion. The existence of ducts can increase the maximum venting pressure in the main vessel significantly. The main factors causing this abnormal phenomenon have not been studied at present. Based on 1.3L Hartmann tube, the experiments of explosion discharge, inerting and inhibition of aluminum powder have been studied in this paper. The main contents and conclusions are as follows: (1) the 1.3L Hartmann device is improved and the conduits of different lengths and diameters are designed. The high frequency pressure sensor is used to measure the pressure, the flame sensor is used to measure the flame characteristics in the tube, and two 8 channel data acquisition boards are used for synchronous acquisition. The experiments of aluminum powder explosion without tube discharge, pipe discharge, inerting and inhibition were carried out on the device. (2) the influence of aluminum powder concentration, particle size and deflagration caliber on the discharge characteristics without tube was studied. The quantitative relationship between the maximum venting pressure and the maximum pressure rising rate and the three factors was obtained by SPSS software. The experimental results show that the parameters that influence the maximum venting pressure from strong to weak are as follows: the diameter of venting, the particle size of aluminum powder and the concentration of aluminum powder; The order of the effect on the maximum pressure rise rate is: the particle size of aluminum powder, the diameter of deflagration and the concentration of aluminum powder. (3) the effect of aluminum powder concentration, particle size and ratio of length to diameter on the discharge characteristics of aluminum powder explosive conduit was studied by using the tube with different aspect ratio. The quantitative relationship between the maximum explosion relief pressure and the maximum pressure rise rate and three factors is obtained by fitting. The results show that the influence on the maximum venting pressure is as follows: the ratio of length to diameter, the particle size of aluminum powder and the concentration of aluminum powder. (4) it is found that the secondary explosion of aluminum powder occurs in the place near the vent of the pipe when the pipe is used for the dust explosion discharge experiment. The reason for the secondary explosion is that the jet flame ignites the unburned aluminum powder in the tube. It is found that the secondary explosion is one of the reasons for the significant increase of the maximum explosion pressure in the vessel when the vessel is released. (5) the combination of explosion release and explosion suppression is a very economical and efficient protection measure for dust explosion. The effects of aluminum silicate cotton porous media and calcium carbonate inert particles on the explosion release characteristics of aluminum powder were studied. It was found that the inert particles of calcium carbonate premixed in the tube of Hartmann and the porous media lined with aluminum silicate cotton inside the tube can effectively reduce the secondary explosion strength of the tube. The maximum venting pressure and flame propagation velocity in Hartmann tubes and ducts have been significantly reduced. (6) it is found that with the increase of calcium carbonate concentration, both the maximum explosion pressure and the maximum pressure rise rate decrease, but the change of the maximum pressure rise rate is more sensitive. Premixed calcium carbonate inert particles can effectively reduce the explosion index and the required explosion area.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：X932
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