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1)  exhaust gas diffusion
废气扩散
1.
In order to know the pollution area by the exhaust gas concentration field and pollutants diffused from the vent tower port,a three-dimensional numerical simulation was used to predict the exhaust gas diffusion from the port under different wind velocity and direction.
计算结果表明,外界风速越高,废气扩散得越快;但因浓度衰减得也越快,故其能对大气形成污染的扩散范围加大到一定程度时又有减小的趋势;出口污染物会对距风井近距离范围内的大气产生一定程度的污染,可适当加高风井高度以使周围建筑物及人员免受污染物的危害。
2)  toxic gas diffusion
毒气扩散
1.
Based on the fact of the toxic gas diffusion from gas explosion, Gaussian puff model was improved, and the formula in accord with the diffusion rule of toxic gas from gas explosion in mines was set up.
针对瓦斯爆炸事故毒气扩散实际情况对高斯烟团模型进行改进,得出了适合井下瓦斯爆炸事故毒气扩散规律的公式,并对公式中的扩散参数进行了修正。
3)  moisture diffusion
湿气扩散
1.
In this article the studies on moisture diffusion process, hygroscopic stresses and moisture-induced vapor pressure are reviewed, with the emphasis on the theoretical analysis, parameter characterization and its experimental measurement and validation, as well as the finite element simulation.
微电子塑料封装中常用的聚合物材料因易于吸收周围环境中的湿气而对器件本身的可靠性带来很大影响,本文回顾了封装材料中湿气扩散、湿应力及蒸汽压力的产生这3个互相联系过程的研究情况,从理论分析、特征参数描述及其实验测定、有限元模拟分析的角度来分别予以介绍。
2.
This paper analyzes rules of moisture diffusion in PBGA and PQFP packages and influence of temperature during dry baking using finite element analysis models.
文章针对实际的PBGA和PQFP器件,利用有限元模型分析了烘烤过程中湿气扩散随时间变化的规律,以及温度对烘烤效果的影响。
4)  heavy gas dispersion
重气扩散
1.
The feasibility to simulate the accidental leaked heavy gas dispersion in atmosphere by salt water experimental method is analyzed according to the similarity theory.
采用缩比模型的盐水模拟实验,对重气在大气中的扩散速度及浓度变化进行了分析,证实了重气扩散过程中的重力沉降、密度分层以及近源区分叉等现象。
2.
The forward finite difference and Newton iterance are used in the light of box model and other heavy gas dispersion models, such as IIT Heavy Gas Models and virtual point source model, to solve the differential equations of controlling heavy gas cl.
文中从控制重气云团扩散行为的微分方程入手 ,根据箱模型(boxmodel)及其他一些重气扩散模型 ,如IITHeavyGasModels模型和虚点源模型 ,采用向前插分和牛顿迭代的方法 ,针对ThorneyIslandTrialNo 。
3.
A Virtue Instrument(Ⅵ)on the heavy gas dispersion was designed and constructed based on the forming causes, the physical properties and the dispersion processes of varies heavy gases,by utilizing the developed data bases,or the numeric controllers written on theⅥinterface manually for the characteristic parameters.
本研究设计构建的重气扩散虚拟仪器,针对不同重气成因、物理属性和扩散过程,通过调用成果数据库或在用户界面控件上手动写入来设置特征参数。
5)  gas diffusion
气体扩散
1.
Numerical simulation of indoor toxic or harmful gas diffusion;
室内有毒有害气体扩散的数值模拟
2.
Influence of gas diffusion in cathode on the property of the fuel cell with ZrO_2 electrolyte;
阴极气体扩散对ZrO_2电池性能的影响
3.
The research results showed that the boosted wind speed or the velocity of gas leakage accelerated the gas diffusion, and the diffused gas concentration to the leeward side was decreased.
通过对泄漏气体扩散边界的研究,可确定泄漏气体扩散形成的危险域。
6)  atmospheric dispersion
大气扩散
1.
The model provides a quick and accurate method for modeling atmospheric dispersion of urban highway net.
提出了一种计算风向与线源成任意角时任意长地面线源大气扩散的简化模式。
2.
In a calculation of the atmospheric dispersion of emissions from a high overhead source,the atmospheric dispersion parameters given in the National Standards GB3840--91 and the Briggs parameters were found to be no longer suitable.
采用Briggs大气扩散参数的一般式()将国内一些实测大气扩散参数组织拟合,求出高架源大气扩散参数。
补充资料:采煤废气和粉尘


采煤废气和粉尘
waste gas and dust of coal mining

采煤废气和粉尘(waste gas and dust ofeoalmining)煤层的采掘和破碎以及选煤、储运等过程,无时不在产生大量粉尘;矿区的能源供应主要依靠直接燃烧原煤,锅炉排放大量烟气和煤尘,这些构成了采煤废气和粉尘的污染源。 采煤废气严重污染矿区及其周边的大气环境。但随着锅炉房位置的正确布局,燃烧设备和技术的改进,烟囱高度的正确选择等一系列技术管理措施的改善,可以使锅炉排气对生活区的危害降至低限。煤矿粉尘直接损害了井下工人的健康,造成很高的尘肺发病率,危害十分严重。而且大量粉尘也随着矿井排风进人大气,污染生活环境。煤矿区地面也有很多粉尘污染源,如煤机厂的翻砂和清砂粉尘、烧结机粉尘,建材企业的球磨和破碎粉尘、水泥粉尘等。此外,选煤厂受煤坑、煤的破碎和干筛分、运输转载部分、储煤场、煤泥晾晒等都是主要的扬尘点。 中国煤矿区的锅炉房大都采取了除尘措施,多数企业能做到达标排放;对于扬尘严重的储煤场地也采取了洒水降尘方案。以河南省平顶山矿区两矿储煤场为例,在占地面积约250om2的储煤场,选用了65BP-55型离心泵一台,安装了7只PYI型喷水头。1只安装在煤楼顶部,6只架设在煤场四周。每只喷头的扬程半径35m,可作360度任意旋转,使储煤场洒水覆盖率超过了90%。与此同时,还安设了1台半自动的控制操作柜,可根据洒水情况任意选择喷洒位置。采取了以上洒水降尘措施之后,其周围环境有了显著改善。(赵济州)
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
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