共查询到20条相似文献,搜索用时 84 毫秒
1.
2.
3.
4.
根据口罩阻挡环境气溶胶微粒吸人人体的使用要求,模拟人体呼吸阻力(通常为30~50 Pa).采集部分市场销售口罩和新型医用组合滤料口罩作为测试对象,对过滤环境气溶胶中0.3~0.4 μm粒径区间的颗粒物的性能进行测试.结果 表明:纱布口罩(8层)透气性大,但对环境气溶胶微细颗粒物的过滤效率低于10.0%,且3个纱布口罩叠... 相似文献
5.
6.
8.
铜基摩擦材料与无石棉纸基摩擦材料在相同工况条件下,具有不同的摩擦系数和磨耗率,产生的滑磨功相差也很大。现就相同试验条件下两的测试情况,及主要摩擦性能进行比较。 相似文献
9.
给水过滤工艺现状测试与研究是老厂滤池技术改造的前提和基础。测试、分析结果表明:匀质滤料和气水反冲洗方式符合给水过滤技术发展趋势,是老厂滤池技术改造的方向。 相似文献
10.
11.
本文主要研究耐高温高效滤料过滤效率在不同测试条件下的影响。笔者通过改造过滤器静态效率测试平台进行实验,对测试气体的温度、气体流速、上游发尘浓度进行调节,观察过滤效率的变化趋势。通过大量实验数据,探讨了各因素对于过滤效率的影响。 相似文献
12.
G. D. E. Glasgow BEng MSc PhD A. D. Wheatley BSc PhD MIBiol 《Water and Environment Journal》2001,15(3):193-197
An increasing number of reported outbreaks of Cryptosporidiosis, associated with the water supply, have led to an upsurge in interest in particle analysis in drinkingwater treatment. This paper describes recent observations of rapid-gravity filter performance using particle-size distribution analysis. Experimental rapid sand filters were constructed and operated using a suspension of PVC particles, and samples for particle analysis were collected at several depths and various times during the filter cycle. Ripening and early breakthrough of Cryptosporidium oocyst size particles were observed during the study, and 1 β particles exhibited the worst capture efficiency. Flow disturbances were found to reduce particle-capture efficiency including Cryptosporidium and Giardia cyst sizes. 相似文献
13.
空调系统新风供给形式对室内颗粒污染物的影响 总被引:1,自引:2,他引:1
着重探讨了风机盘管加新风的空调系统和两种变风量空调系统形式中,新风量,新风过滤效率和室外含尘粒子对室内颗粒污染物的影响,最后指出对一次,二次风的混合进行中效过滤的全空气系统,能够明显提高新风稀释和排除室内粉尘的能力,完全能够满足是用户对环境日益增加的健康和舒适方面的要求。 相似文献
14.
有关单纤维过滤模型的过滤机理,早期大致将其归类为三种机理:扩散机理、惯性机理、拦截机理。针对这三个机理,也提出了不少的研究方法及理论公式模型,亦有对单一机理的合并分析理论。本文主要就这三个过滤机理的合理性及单机理合并的实际意义进行讨论分析,并讨论今后探索多重机理联合作用模型对实际研究的重要性,方法即是通过效率值的计算对比进行分析。计算分析了各单一机理之间的捕集效率理论误差及合并后对总效率的影响误差,研究结果表明:各单一过滤机理的各经验模型之间或大或小都存在着一定的差距,而对单一机理的合并则会让这样的差距进一步扩大。 相似文献
15.
从通风与空调运行能耗的角度,对《建筑节能工程施工质量验收规范》GB50411-2007中通风与空调工程现场节能检测的相关条款进行了分析,就如何完善通风与空调工程节能性能现场检测的问题进行探讨,并在此基础上提出了增加能耗检测项目的具体内容。 相似文献
16.
F. P. Bourgine Eurlng J. I. Chapman BSc R. J. Bastiment M. G. Gennery IEng MIEIE J. G. Green BEng MSc CEng MICE 《Water and Environment Journal》1998,12(3):170-174
The effect of the introduction of additional process stages in a surface-water treatment plant was studied in order to investigate how particle removal could be optimized. Particle counting is considered to be a useful indicator of treatment performance. This paper is based on results which were obtained from trials on a water-treatment plant treating surface water; these consisted of a combination of modifications to existing full-scale plant and a specially constructed pilot plant. 相似文献
17.
18.
A UK standard for the specification, approval and testing of filtering materials has recently been published by British Water (formed by the merger of the British Effluent and Water Association and the British Water Industries Group) in response to an identified need. This paper reviews the considerations during the preparation of the standard and provides a technical background. The approach has been to base the standard on parameters which affect the behaviour of the material during filtration, rather than to specify material composition and appearance, which are unimportant. Standards and specifications are a basis for testing, and the inclusion of irrelevant parameters can lead to unnecessary work. 相似文献
19.
本文介绍了几种天然非金属矿物的过滤性能,对当前非金属矿在过滤行业的应用进行了阐述,并分析了未来非金属矿物材料在过滤材料应用中的发展趋势。 相似文献
20.
本文阐明了对袋式除尘器用滤料进行表面技术处理的必要性及其产生的相关问题,并通过现有理论及实验研究结果对滤料孔隙率与过滤阻力、过滤效率之间的两组关系分别进行分析论证,得出两组关系在除尘实践中存在的矛盾:滤料的孔隙率增大,过滤阻力减小,但是过滤效率也随之减小;而当孔隙率减小时,过滤效率增大,过滤阻力也增大。在实际过滤除尘工程中,用户和设计者往往希望拥有高效低阻的过滤材料。为此本文给出了解决这个矛盾的思路,以及依据实际过滤除尘工况寻找复合滤料最佳孔隙率的具体操作方法,这不仅对滤料的性能优化设计、选择提供了方法指导,还将有助于新型滤料的研发,同时也避免了对滤料进行表面处理时存在的盲目性。 相似文献