多针-水膜电极电晕放电脱硫研究

采用不锈钢多针作为高压电极系统,水膜为低压电极.负直流高压电源供电,含二氧化硫(SO2)的污染气体从高压电极系统的轴向进入,沿着电晕放电电场从水膜上方通过,在电晕放电等离子体和水吸收共同作用下,生成硫酸使SO2得到脱除.主要研究了放电电压、气体中SO2初始浓度和气体在电极系统的停留时间对脱硫效果的影响,并测试了水中SO32-和SI42-离子浓度,分析SO2脱除机制.结果表明,电晕放电和水吸收对SO2脱除具有很好的协同作用,脱硫效果明显升高,SO2转变生成硫酸量的体积分数提高;脱硫效果随电压增加和停留时间的增加而增加,初始浓度对脱硫效果有影响.当SO2初始浓度(体积分数)为430×10-6,施加电压为14.5 kV,停留时间为7.5 s时,脱硫效率达90%以上.     

推流式SBR工艺可行性研究

根据我国中小型城市生活污水处理的需要,改进SBR部分结构,设计出推流式SBR装置,通过试验寻找推流式SBR运行条件,验证装置对有机物降解效率,同时亦验证装置对氮、磷的脱除效果。研究表明推流式SBR工艺由于特殊的运行方式,对NH3-N和TP的去除彻底,NH3-N去除率最高达到92%,TP的去除率最高达到98.76%,TN的去除率73%,COD去除率达90%。     

Engineering layout of fuel tanks in a tank farm

The present paper deals with the location of tanks in a tank farm, in chemical and allied industries. Ideally the tanks are so placed and installed that in case of fire, the neighbouring tanks could remain safe. The safe distance of separation among the tanks is calculated in no wind condition, as well as, in the presence of wind. The paper uses the methods available in literature and modifies the point source model to include the effect of wind vector on the flame height during the calculation of safe inter-tank distance. It is found that for wind velocity > 4 m/s, the modified point source model provides appropriate inter-tank distance. However, for no wind and with wind velocity < 4 m/s, the Shokri-Beyler’s method provides safe inter-tank distance.     

Se（IV）在改性水滑石和膨润土的吸附行为

79Se是高放废物地质处置安全评价中的重点关注的核素之一,如何有效地阻滞其在处置库环境中的迁移扩散是目前研究的热点。将金属盐溶液和有机溶剂与水滑石和膨润土混合制备,分别得到2种无机改性水滑石和9种不同的有机和无机改性膨润土,通过批次实验研究这些改性材料对Se(IV)的吸附性能。结果表明无机改性的水滑石和膨润土对Se(IV)均有较好的吸附,吸附率超过57%。而有机改性的膨润土吸附效果很差,吸附率低于10%。采用SEM和XRD对这些改性材料进行表征,结果表明：无机改性后的膨润土的比表面积和层间距均增大,有利于对Se(IV)的吸附。     

Sb-SnO_2/Ti纳米涂层电极对对硝基苯酚的电催化氧化

采用改进的热氧化工艺制备了不同掺锑量二氧化锡纳米涂层电极,对电极结构和形貌进行表征,进行了电化学性能测试,并进一步考察了不同掺锑量二氧化锡纳米涂层电极对对硝基苯酚电催化氧化降解行为。研究结果表明:不同掺锑量二氧化锡纳米涂层电极析氧电位均在1.70V(vs.SCE)以上,当掺锑量WSb/(WSn+WSb)为6.450wt%时,电极的电催化氧化性能最好,对硝基苯酚的电催化氧化反应属于电化学燃烧过程。     

Experimental study of the influence of particle size on Minimum Explosible Concentration of sulfur dust

Despite the extensive use of sulfur in the industry, very little information is available in the literature on its key dust explosion properties. The work presented in this paper contributes to filling the current knowledge gaps on sulfur dust explosion properties and focuses on the experimental determination of the MEC of sulfur dust using a Modified Hartmann Tube and a 20 L dust explosion sphere. First, the MEC of sulfur dust samples collected at a sulfur production facility from areas prone to the generation of fine sulfur dust was measured. The results showed that these sulfur dust samples are fine enough to cause dust explosions with 55 ± 5< MEC <105 ± 5 g/m³. Second, the influence of the particle size of sulfur dust was investigated with both equipment. The use of the Modified Hartmann Tube for MEC determination showed that the MEC increases with increasing particle size in the particle size range of 0–2000 μm. Unlike the Modified Hartmann Tube, MEC experiments done in the 20 L Sphere did not allow the quantification of the influence of the particle size on the MEC. These results were explained by the phenomenon of particle breakage induced by the 20 L Sphere's dispersion mechanism. Additional experiments with the 20 L sphere confirmed the particle breakage of sulfur dust particles and showed that it is inversely proportional to dust concentration and proportional to the dust's original particle size distribution.     

电絮凝法去除饮用水中氟的研究

采用双铝电絮凝法去除饮用水中的氟.研究了电极间距、原水pH值、原水氟浓度、电流密度对除氟的影响.结果表明,电絮凝法去除地下水中的氟不需添加可溶性盐和改变pH值,在选定的实验条件下,阳极面积与反应器容积比为52.5 m2/m3,电极间距1.0 cm,电流密度30 A/m2,反应10 min后,出水中F-浓度符合国家饮用水卫生标准.