Bumpy Particle Adhesion and Removal in Turbulent Flows Including Electrostatic and Capillary Forces

The effect of electrostatic and capillary forces on bumpy particle adhesion and removal in turbulent flows is studied. We use the JKR theory and account for the increase of adhesion by capillary force. The effects of electrostatic forces and nonlinear hydrodynamic drag are included in the analyses. The criteria for incipient rolling and sliding detachments and electrostatic lifting removal are evaluated. A turbulence burst model is used for evaluating the peak air velocity near the substrate. The critical shear velocities for detaching particles of different sizes under different conditions are evaluated. The electric field strength needed for electrostatic removal of particles with different charges is also estimated. The results are compared with those obtained in the absence of the capillary force. Comparisons of the model predictions with the available experimental data are also presented.     

MDEA法脱碳塔的扩产改造

通过对现有脱碳装置和运行条件的分析核算，提出了改造方案和实施措施，对改造前后参数和生产数据进行了对比和总结。     

Removal of chromium (VI) from dilute aqueous solutions by activated carbon developed from Terminalia arjuna nuts activated with zinc chloride

Different structured activated carbons were prepared from Terminalia arjuna nuts, an agricultural waste, by chemical activation with zinc chloride for the adsorption of Cr(VI) from dilute aqueous solutions. The most important parameter in chemical activation was found to be the chemical ratio (activating agent/precursor, g/g). Carbonization temperature and time are the other two important variables, which had significant effect on the pore structure of carbon. A high surface area of was obtained at a chemical ratio of 300%, carbonization time and temperature of 1 h and 500 °C, respectively. The activated carbon developed shows substantial capability to adsorb Cr(VI) from dilute aqueous solutions. The parameters studied include pH, adsorbent dosage, contact time, and initial concentrations. The kinetic data were best fitted to the Lagergren pseudo-first-order model. The isotherm equilibrium data were well fitted by the Langmuir and Freundlich models. The maximum removal of chromium was obtained at pH 1.0 (about 99% for adsorbent dose of 2 g/l and 10 mg/l initial concentration).     

水性丙烯酸树脂的合成研究

以甲基丙烯酸甲酯、丙烯酸丁酯为主要单体,以过氧化苯甲酰为引发剂,通过引入亲水性基团羧基和羟基,制备了水性丙烯酸树脂。确定了最佳反应条件,讨论了水性基团的用量对树脂性能的影响,并用红外光谱(FT-IR)和差示扫描量热分析(DSC)对所合成树脂的结构进行了分析和表征。     

脱硫吸附剂与吸附脱硫技术

综述了国内外原料气和燃料油吸附脱硫技术在吸附脱硫材料和吸附脱硫工艺方面的研究与开发进展。介绍了分子筛类、金属氧化物类、活性炭类等脱硫吸附剂。分别评述了物理吸附、活化吸附、选择性吸附等燃料油吸附脱硫技术的机理和工艺。     

气雾型自动喷漆中助剂的应用

分析了气雾型自动喷漆中影响沉降，分散稳定性的主要因素，研究了助剂的应用及工艺改进等解决方法。     

改性粉煤灰处理奥里油废水的实验研究

初步分析了奥里油废水的水质,研究了用酸改性粉煤灰处理奥里油废水的工艺。奥里油废水是一种含有一定表面活性剂、高COD值(大于6000 mg/L)、难生物降解和难O3氧化降解的炼油废水。利用改酸性粉煤灰可对该废水进行预处理,COD去除率达45%。预处理工艺条件是,室温下灰水质量比15∶50,吸附搅拌时间30 min,pH为2~10。     

耐高温防腐蚀涂料的研究进展

介绍了高温腐蚀的几种常见形式以及耐高温防腐蚀涂料存在的问题和研究进展。该类涂料的研究将朝着复合材料方向发展，有机与无机材料相互结合而成的有机-无机型耐高温防腐蚀涂料将是一个新的发展方向。     

合成树脂型防霉建筑涂料的研究及其施工

以合成树脂为主要成膜物质,加入环保型杀菌防霉剂及功能性颜填料,制成防霉期长、装饰性好、成本低、环保的合成树脂型防霉建筑涂料。     

Study of mass transfer in a vertically moving particle bed electrode

A study was made of the influence of process parameters on the mass-transfer coefficient in a flow-through cell with a cascade of rotating drums partially filled with conductive particles (called the vertically moving particle bed). Copper deposition from an acidic sodium sulphate solution was used as the model reaction. To evaluate the experimental data a macrohomogeneous mathematical model of potential and current density distribution inside the cell was developed. The electrolyte flow distribution between the empty space above the particle bed and through the bed was evaluated. On the basis of these results the following correlation is proposed: