汽车制造厂焊接车间通风方式的研究

汽车制造厂焊接车间在焊接工艺过程中会产生一定量的有害气体,如何使工程初投资与系统运行费用最低,控制有害物的排放,以某工程实例,对诱导式通风方式进行了研究与数值模拟计算,并与原来只设屋顶排风机的通风方式进行比较,最后得出结论,采用15°喷射角的诱导通风方式,有利于有害物的排出,通风效果良好,且运行节能。     

白集煤矿区域可控循环风系统的理论分析与试验

针对白集煤矿深部采区供风量不足的问题,从技术和经济两个方面论证了该煤矿可控循环风方案的可行性,设计了一套由喷雾降尘装置、过滤装置和冷却降温装置组成的循环风流处理系统.在理论上分析了循环风流中瓦斯体积分数、粉尘质量浓度和其他气体成分在可控循环风系统中变化规律,以及可控循环风系统对主通风系统的影响.通过现场实测,不仅验证了瓦斯体积分数、粉尘质量浓度的变化规律,而且处理后的循环风流品质完全达到<煤矿安全规程>要求,同时对回风流的降温降湿处理,可满足高温高湿矿井工作面对风流温湿度的需求.     

强生科学交流中心实验室通风系统设计

用来展示医疗器械、模拟手术环境和培训医生的实验室,其中的通风系统要求能够模拟医院有洁净要求的手术室和生化实验室环境,将室内产生的有害气体和气味充分控制,除掉向室外排气中的有害物质,并且结合工程实例讨论我国目前有关设计规范应用的一些问题。     

Methanogenesis acceleration of fresh landfilled waste by micro-aeration

Introduction The key technology of bioreactor landfill ( Pohland,1995) and ecologically based landfill ( Bramryd, 2001 )consists in the initiative regulating of microbial activities inlandfill layers, so as to accelerate waste degradatio…     

基于气候调节的城市通风道探析

近年来,夏季炎热的气候和愈来愈强的热岛效应使城市饱受因挠,而城市设计策略中缺乏有效的生态规划方法来解决目前存在的问题,城市对炎热气候的适应性不足。论文在利用CFD(计算流体动力学)技术进行实例模拟分析的基础上,重点介绍了一种在城市尺度进行节能设计的新方法:在城市中建立多种形式的通风道,提高城市的通风和排热能力,以达到利用自然资源和有效的规划方式降低夏季城市“热岛”温度、节约能源的目的。文中详细论述了通风道的可行性和必要性、营建方式、注意原则等问题,并进行了一系列的计算机风场模拟研究。     

Influence of Geometry on the Mean Flow within Urban Street Canyons – A Comparison of Wind Tunnel Experiments and Numerical Simulations

A comparison between numerical simulations and wind tunnel modelling has been performed to examine the variation with streamwise aspect ratio (width/height, W/H) of the mean flow patterns in a street canyon. For this purpose a two-dimensional (2-D) cavity was subjected to a thick turbulent boundary layer flow perpendicular to its principal axis. Five different test cases, W/H = 0.3, 0.5, 0.7, 1.0 and 2.0, have been studied experimentally with flow measurements taken using pulsed-wire anemometry. The results show that the skimming flow regime, with a large vortex in the canyon, occurred for all the cases investigated. For the cavities with W/H 0.7 a weaker secondary circulation developed beneath the main vortex. The narrower the canyon, the smaller the wind speed close to the cavity ground, giving increasingly poor ventilation qualities. The corresponding numerical results were obtained with the Computational Fluid Dynamics (CFD) code CHENSI that uses the standard k- model. The intercomparison showed good agreement in terms of the gross features of the mean flow for all the geometries examined, although some detailed differences were observed.     

A COMPARISON OF METHODS AND INSTRUMENTATION OF BIOLOGICAL EARLY WARNING SYSTEMS1

ABSTRACT: Rapid biological information systems using aquatic organisms to monitor water and waste water quality have only recently begun to develop technologically for practical on-site applications. One approach which has been demonstrating its feasibility recently monitors the ventilatory behavior of fish to assess, for example, the quality of drinking water supplies and industrial waste water discharges. A comparison of the basic strategies of the various biological monitoring systems making use of this concept is presented. In addition, the applications and potential utilization of these systems are discussed.     

城市污水处理厂鼓风机房通风设计分析

本文介绍了城市污水处理厂鼓风机房通风设计的重要性，分析了鼓风机房的进气系统及排气系统的设计要点，并介绍了肇庆污水处理厂的鼓风机房设计实例。     

深井高温热环境的数值评价

根据井下工作面热环境的特点,采用了数值模拟的方法,对高温巷道中的热环境进行数值模拟计算,并应用预计热舒适指标(PMV)对不同设计参数的井下环境的热舒适程度进行科学的评价,给出了高温巷道中的速度场、温度场、热舒适PMV值。以某矿山高温巷道为实例进行了热环境评价,得出了热环境评价结果。结果表明在温度为40℃的高温巷道中,采用入口处风速为0.8m/s即可满足通风降温的要求,所得结果更具有直观性、准确性,为最优通风降温方案的确定提供了技术依据。     

改进灵敏度矩阵的矿井通风故障源诊断及传感器布置研究

利用当前的矿井通风安全监测监控系统,只能反映安设风速传感器的井巷风量发生变化,至于变化是由该条巷道故障引起的,还是由于拓扑关系原因引起的,都无法诊断故障源,通风系统的故障可以归结为分支的风阻发生变化。如果分析每一条分支风阻变化对通风系统的影响,即每一条分支都安设风速传感器是不可能的。因此,井下风速传感器的布置最小数量及位置问题也是研究的重点。改进灵敏度矩阵,建立分支灵敏度0-1矩阵和通风网络故障巷道范围库,用以确定可能引起风速超限的故障巷道范围。最后,提出最少全覆盖布点法,给出分支覆盖度和影响巷道范围库的概念,用以求得风速传感器的宏观布点。