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791.
瓦斯爆炸传播过程中障碍物激励效应的数值模拟 总被引:1,自引:0,他引:1
笔者对瓦斯爆炸传播过程中的障碍物的激励效应的物理机制进行了分析 ,并构建了相应的物理模型 ,设计了 3种情况下 ,对冲击波经过障碍物附近时的变化特征进行了数值模拟。结论表明 ,非燃烧区的障碍物同样存在激励效应 ,激励效应取决于瓦斯爆炸冲击波的初始强度 ,即爆轰状态激励效应最为强烈。 相似文献
792.
梁华 《中国安全科学学报》1995,(Z2)
通过对数十个液化石油气新罐场的设计审核和在用罐场调研分析,深入比较常用几种贮罐液面计之优劣与使用特点,介绍了适用于小型贮配站改造用简易价廉的钢瓶倒残系统,提出采用地下掩埋式贮罐设计方案,争取实现贮罐使用安全性和投资回报的优化组合。 相似文献
793.
Akinori Hashimoto Akiko Matsuo 《Journal of Loss Prevention in the Process Industries》2007,20(4-6):455-461
Simulations of gas explosion of hydrogen/air mixture inside two rooms connected by ducts are carried out. Scalar transport chemical reaction model and LES turbulence model are utilized to reduce the calculation load and to conduct real-scale analysis. The effects of ignition source locations and volume of ignited room are analyzed, and the time history of pressure and rate of pressure rise in each room are focused in this study. When the volume of the ignited room is larger than the other room, the high pressure from the other room causes a force to act on the partition to the ignited room. This study indicates that the current technique can predict specific features of gas explosions inside two rooms connected by the ducts. 相似文献
794.
Dust Explosion Simulation Code (DESC) was a project supported by the European Commission under the Fifth Framework Programme. The main purpose of the project was to develop a simulation tool based on computational fluid dynamics (CFD) that could predict the potential consequences of industrial dust explosions in complex geometries. Partners in the DESC consortium performed experimental work on a wide range of topics related to dust explosions, including dust lifting by flow or shock waves, flame propagation in vertical pipes, dispersion-induced turbulence and flame propagation in closed vessels, dust explosions in closed and vented interconnected vessel systems, and measurements in real process plants. The new CFD code DESC is based on the existing CFD code FLame ACceleration Simulator (FLACS) for gas explosions. The modelling approach adopted in the first version entails the extraction of combustion parameters from pressure–time histories measured in standardized 20-l explosion vessels. The present paper summarizes the main experimental results obtained during the DESC project, with a view to their relevance regarding dust explosion modelling, and describes the modelling of flow and combustion in the first version of the DESC code. Capabilities and limitations of the code are discussed, both in light of its ability to reproduce experimental results, and as a practical tool in the field of dust explosion safety. 相似文献
795.
Flame propagation in hybrid mixture of coal dust and methane 总被引:1,自引:0,他引:1
Yi Liu Jinhua Sun Dongliang Chen 《Journal of Loss Prevention in the Process Industries》2007,20(4-6):691-697
To investigate the flame propagation through hybrid mixture of coal dust and methane in a combustion chamber, a high-speed video camera with a microscopic lens and a Schlieren optical system were used to record the flame propagation process and to obtain the direct light emission photographs. Flame temperature was detected by a fine thermocouple. The suspended coal dust in the mixture of methane and air was ignited by an electric spark. The flame propagation speeds and maximum flame temperatures of the mixture were analyzed. The results show that the co-presence of coal dust and methane improves the flame propagation speed and maximum flame temperature notably, which become much higher than that of the single-coal dust flame. The flame front temperature varies with the coal dust concentration. 相似文献
796.
Zhihua Chen Baochun Fan Xiaohai Jiang 《Journal of Loss Prevention in the Process Industries》2006,19(6):648-655
Suppression tests of oxyhydrogen gas explosions were performed in an explosion tube with five types of dry powder used as the suppressants. The experimental results showed that the powder with large dust cloud density and small radius has better suppression effect, which agrees well with previous correlative results. Moreover, our results also showed that particles with chemical activity and light material density, their suppression effect are more prominent than that of the inert particles with heavy density. To discover the detailed suppression process of dust powder, governing equations were developed based on the homogeneous reactive two-phase flow. The TVD scheme and the Lax–Wendroff–Rubin scheme were adopted to solve the reactive gas phase and particle phase, respectively. The time splitting technique was employed to handle the stiffness of the coupled equations. Our calculated results showed that the dust cloud has the suppression effect on the explosion of oxyhydrogen gas, and with the increase of dust cloud density or the decrease of particle diameter, its suppression effect become more evident, which is in good agreement with our experimental results, in addition, the numerical results showed that with the same particle diameter, the suppression performance is enhanced with the reduction in particle material density. 相似文献
797.
Agns Jullien Pierre Monron Gaetana Quaranta David Gaillard 《Resources, Conservation and Recycling》2006,47(4):356-374
An experimental study of road building and recycling of used pavement has been conducted within the framework of a Life Cycle Analysis. Four equivalent asphalt concretes made with different recycling rates have been investigated during road construction. Airborne emissions, pollutant release over time and odor production related to asphalt laying have all been determined and compared among the various recycling rates. All of the results (VOC, PAH and odors), expressed in terms of concentrations and fluxes, exhibit quite monotonic variations with respect to the recycling rate. These results, however, did not reveal the same trend as a function of the recycling rate (increases or decreases), depending on the selected target parameter (VOC or PAH). Indicators have been proposed for a discussion of results that take into account: (i) raw material emissions with respect to the reference defined in the case of pavement without reclaimed asphalt; and (ii) emissions in each case from all material production sources. 相似文献
798.
799.
现在测定COD多数采用的是重铬酸钾硫酸回流法消解水样,此方法存在着消解后铬盐排放会造成二次污染、回流氧化时间过长、因使用剧毒的汞盐作掩蔽剂易引起汞污染等缺点。针对这些缺点本文将介绍一些新的方法和监测技术。 相似文献
800.
配备低压进样系统的GC-FID法测大气中的CO和CH_4 总被引:1,自引:0,他引:1
将自主研发的低压进样系统与GC-FID法相结合,解决了低压样气难以抽取进样的技术难题,实现了对SUMMA采样罐内低压样气中CO、CH4的分析.罐内样气压强大于30kPa情况下,该进样装置能将待测低压气体提升至常压状态并完成进样过程.本系统采用3个六通阀、5分子筛与TDX-01双柱实现O2、CO、CH4的有效分离.通过对5分子筛柱的反吹去除杂质组份,既保持基线平稳,又可缩短分析周期,提高效率.该分析系统CO、CH4的最低检出限分别为9.2×10-9、5.5×10-9.本分析系统与美国加州大学Irvine分校Donald R.Blake实验室针对CO、CH4比对的相对误差分别低3%和1%. 相似文献