超临界二氧化碳回收处理废润滑油的研究

超临界二氧化碳作为一种环境友好型溶剂,具有临界温度低,渗透性和溶解能力强,无杂质残留,不产生二次污染等优点。文章主要介绍了超临界二氧化碳作为降粘剂,结合膜分离技术,用于废润滑油回收处理方面的研究进展。     

长径比对卧螺离心机内流场影响的数值模拟

研究用于污泥脱水的卧螺离心机的分离性能,并应用FIUENT软件建立卧螺离心机螺旋流道内污泥流体的两相湍流三维模型。主要研究不同转鼓长径比对卧螺离心机分离性能的影响,间接给出了不同长径比对卧螺离心机分离性能的影响关系图,并得到了该卧螺离心机最佳转鼓长径比的几何尺寸,为进一步研究离心机特性参数对其分离性能的影响和结构优化提供了理论依据。     

Flame acceleration in tube explosions with up to three flat-bar obstacles with variable obstacle separation distance

The effect of obstacle separation distance on the severity of gas explosions has received little methodical study. It was the aim of this work to investigate the influence of obstacle spacing of up to three flat-bar obstacles. The tests were performed using methane-air (10% by vol.), in an elongated vented cylindrical vessel 162 mm internal diameter with an overall length-to-diameter, L/D, of 27.7. The obstacles had either 2 or 4 flat-bars and presenting 20% blockage ratio to the flow path. The different number of flat-bars for the same blockage achieved a change of the obstacle scale which was also part of this investigation. The first two obstacles were kept at the established optimum spacing and only the spacing between the second and third obstacles was varied. The profiles of maximum flame speed and overpressure with separation distance were shown to agree with the cold flow turbulence profile determined in cold flows by other researchers. However, the present results showed that the maximum effect in explosions is experienced at 80 to 100 obstacle scales about 4 times further downstream than the position of maximum turbulence determined in the cold flow studies. Similar trends were observed for the flames speeds. In both cases the optimum spacing between the second and third obstacles corresponded to the same optimum spacing found for the first two obstacles demonstrating that the optimum separation distance does not change with number of obstacles. In planning the layout of new installations, the worst case separation distance needs to be avoided but incorporated when assessing the risk to existing set-ups. The results clearly demonstrate that high congestion in a given layout does not necessarily imply higher explosion severity as traditionally assumed. Less congested but optimally separated obstructions can lead to higher overpressures.     

特厚煤层不同开采阶段"弱-弱"结构覆岩破坏高度研究

为了确定老虎台矿特厚煤层不同开采阶段"弱-弱"结构覆岩破坏高度,以63005工作面所在区域为研究对象,构建FLAC3D数值计算模型,对研究区域水砂充填开采阶段和综采放顶煤开采阶段覆岩破坏高度进行分析,确定了覆岩破坏高度与采出厚度的关系.分别采用微震监测、EH-4探测法对研究结果进行了验证.结果表明:无论水砂充填开采阶段还是综采放顶煤开采阶段,老虎台矿"弱-弱"结构覆岩最大破坏高度均约为等效采高的8.5倍;63005工作面开采前后,覆岩破裂最大高度与油母页岩和绿色页岩的分界面密切相关,均被控制在分界面之下;覆岩破坏高度受到F18断层的影响,被约束在断层破碎带沿走向范围内;63005工作面开采后,绿色页岩层中F18断层的下盘出现离层破坏,且破坏范围呈逐步扩大的趋势.     

超疏水膜用于含油废水处理过程机理及研究进展

综述了多年来国内外高度疏水膜应用于乳化油污水处理的研究及进展,简单介绍了含油污水处理及破乳方法,重点介绍了疏水膜分相机理和处理油水乳状液的破乳机理,讨论了影响疏水膜油水分离的因素。最后对今后的研究方向提出展望。     

ATC废液的几种物化处理单元技术

ＡＴＣ废液具有高ＣＯＤ、高含盐量，以及生物降解的特点。本文分析了ＡＴＣ废液的水质特点，介绍了酸忻，氧化，混凝等几种处理ＡＴＣ废液的物化单元技术，并据此总结出一条对ＡＴＣ废液进行物化预处理的优选路线。     

高梯度磁除尘的实验研究

对磁性粉尘和非磁性粉尘进行了磁分离实验研究。结果表明,对磁性粉尘,磁除尘效率可达99％以上,而对非磁性粉尘,通过粉尘上磁,磁除尘效率可达90％以上。