共查询到19条相似文献,搜索用时 105 毫秒
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化学毒性气体事故泄漏扩散的数值模拟及评价 总被引:6,自引:0,他引:6
在研究化学毒性气体事故泄漏的扩散模式的基础上 ,利用扩散模型对一氨气泄漏事故排放进行了数值模拟及评价 ,这种方法可为化学品安全评价、环境风险评价管理、风险工程设计、风险责任保险等领域及应急计划制定、事故抢险工作实施提供有效的工具。 相似文献
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基于FLUENT的物质传输模型建立氯气泄漏扩散模型,针对不同泄漏速率、外界风速、障碍物类型等对氯气泄漏扩散进行数值模拟.结果表明,泄漏速率较大时,重气效应明显增大,下风向形成的高浓度区增大;外界风速对重气扩散浓度和扩散危险性区域有很大影响,风速较大时,重气云在下风向的扩散速率增大,在水平侧风向的扩散速率减小,在泄漏源和障碍物附近的停留时间减少,形成的危险区域较小;不同的地表条件是影响重气扩散的重要因素. 相似文献
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化学危险性气体泄漏扩散模拟及其影响因素 总被引:1,自引:0,他引:1
分析了描述易燃易爆及有毒有害气体泄漏扩散过程的数学模型 ,包括Gaussian模型、Gaussian轨迹烟云模型、BM模型、Sutton模型及FEM3模型。重点介绍了目前广泛使用的Gaussian模型及Gaussian轨迹烟云模型。针对事故泄漏扩散过程的复杂性 ,详细讨论了气象条件及地形条件对危险性物质泄漏扩散过程的影响 ,此外还对不确定参数的选取进行了探讨。 相似文献
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可燃及毒性气体泄漏扩散研究综述 总被引:61,自引:0,他引:61
就国内外关于危险性气体(包括可燃性及毒性气体)扩散研究中的数值模型与试验情况进行了综述。数值模型包括高斯烟羽模型、高斯烟团模型、B.M.模型、SUT-TON模型及FEM3模型等。试验研究包括80年代国外进行的一些较大规模试验,如Burro试验、Coyote试验、DesertTortoise试验及Goldfish试验等。 相似文献
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可燃及毒性气体扩散研究 总被引:30,自引:1,他引:29
从气体动力学入手,通过对气体微元进行质量平衡、动量平衡、能量平衡的分析,采用了新的扩散模型对危险性气体的扩散进行数值模拟,为了验证模型的合理性,设计简易风洞,对轻重气体(包括二氧化碳、丙烯、乙炔等气体)在不同的泄放条件下进行了多次定常风洞扩散试验,得到了气体实际扩散后浓度的分布,同时也考察了风速、泄放速率、气体密度等主要因素对气体扩散的影响,得到气体扩散的一般规律。模型计算结果与试验数据吻合较好,最大浓度计算值与试验值的平均偏差在20%以内,且浓度分布趋势一致,从而证明了该模型的合理性。编制了模拟软件可作为泄漏扩散事故的预防及发生事故后采取应急防护措施的分析工具 相似文献
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Zhiguo Yan Sai Tang Xumiao Zhou Li Yang Xingqing Xiao Houyang Chen Yuanhang Qin Wei Sun 《中国化学工程学报》2019,27(1):174-181
The exhaust gases, including SO_2,NH_3, H_2S, NO_2, NO, and CO, are principal air pollutants due to their severe harms to the ecological environment.Zeolites have been considered as good absorbent candidates to capture the six exhaust gases.In this work, we performed grand canonical ensemble Monte Carlo(GCMC) simulations to examine the capability of 95 kinds of all-silica zeolites in the removal of the six toxic gases, and to predict the adsorption isotherms of the six gases on all the zeolites.The simulation results showed that, H_2S, NO, NO_2, CO and NH_3 are well-captured by zeolite structures with accessible surface area of 1600–1800 m~2·g~(-1) and pore diameter of 0.6–0.7 nm, such as AFY and PAU, while SO_2 is well-adsorbed by zeolites containing larger accessible surface area(1700–2700 m~2·g~(-1)) and pore diameter(0.7–1.4 nm) at room temperature and an atmospheric pressure.However, at saturated adsorption, zeolites RWY, IRR, JSR, TSC, and ITT are found to exhibit better abilities to capture these gases.Our study provides useful computational insights in choosing and designing zeolite structures with high performance to remove toxic gases for air purification, thereby facilitating the development and application of exhaust gas-processing technology in green industry. 相似文献
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A brief investigation has been carried out into the nature and quantity of the toxic gases evolved during the thermal decomposition of polyurethane, urea-formaldehyde, nylon and acrylonitrile in air and in nitrogen. The weight fractions of the polymers evolved as hydrogen cyanide are given, together with the lowest temperatures at which hydrogen cyanide, carbon monoxide, ammonia and nitrogen oxides are evolved. Apparent activation energies for the evolution of hydrogen cyanide and carbon monoxide have been determined. A brief discussion of the experimental data is given. 相似文献
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Ana Mafalda RibeiroJosé Miguel Loureiro 《Chemical engineering science》2002,57(9):1621-1626
The system ASC carbon filter/cyanogen chloride was studied by simulation. Three filter configurations and several models, taking into account Langmuir adsorption and second-order reaction between the adsorbed toxic vapour and the active metal on the surface, were developed.The effects of axial dispersion, number of reaction units, film mass transfer units and intraparticle mass transfer resistance on the breakthrough time were studied.Simulation results show that a complex model should be used in order to predict with reasonable accuracy the protection imparted by these filters. 相似文献
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The distribution of the dynamic and thermal parameters of a gas in the immediate vicinity of a flame stabilizer (behind a rib and a backward-facing step 3 mm high) are studied. Data on the longitudinal and transverse velocity components, velocity pulsations, and correlations of pulsations in the boundary layer with combustion and without combustion are obtained using the PIV equipment. Temperature is measured with a thermocouple. Flame is visualized in the visible and ultraviolet regions. It is shown that in the flow attachment region near the leading edge of the flame, the gas velocity is close to the normal burning velocity. Heat release is estimated from the results of measurements. The presence of regions of volume and frontal combustion and kinetic and diffusion reaction is established. With increasing distance from the stabilizer, the heat-release rate decreases by more than an order of magnitude. 相似文献
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水泥厂主要有害气体及其防治 总被引:1,自引:0,他引:1
叙述了水泥生产过程中产生的主要有害气体,论述了它们的理化特征及给人类社会带来的危害。有害气体的防治技术很多,但有些成本很高,有的尚未进入实用阶段。文章结合我国国情,针对《水泥工业大气污染物排放标准》GB4915-2004的规定,重点对二氧化硫、氮氧化物等气态污染物的降排处理,介绍了一些较为简单有效而又适用的防治技术。另外,对产生温室效应的罪魁——二氧化碳的产生机理、数量及减排措施也提出了见解,并建议不失时机地利用清洁发展机制(CDM)来获得资金援助和先进技术。 相似文献
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