Inherent relations between yield stress and stability of bubble petroleum coke water slurry

The stability of petroleum coke water slurry（PCWS） is currently a hot topic. The inherent relationship between yield stress and stability of bubble-PCWS was studied through orthogonal experiments and range analysis in this work. The results showed that the stability of bubble-PCWS was positively related to the yield stress and that the yield stress could be greatly impacted by the operation conditions during preparation of bubble-PCWS. The main factors affecting the yield stress of bubble-PCWS were solid concentration, aeration time and dosage of frother. However, the effects of aperture size of air distribution plates and type of frother on the yield stress were slight within the experimental range. The optimal conditions for the greatest yield stress were as follows： aeration time of 30 min, solid concentration of 65 wt%, frother dosage of0.030 wt% of the air-dried pulverized petroleum coke, aperture size of air distribution plate of 2-5 lm and AOS frother.The yield stress and the pour rate of bubble-PCWS under this optimum operation condition could reach maxima of more than 0.4 Pa and 96%, respectively.

水焦浆/水煤浆燃烧特性对比研究

采用热重分析仪研究了水焦浆的着火、燃烧特性,并与兖州烟煤水煤浆、贵州无烟煤水煤浆进行了对比;通过TG-DTG法确定燃烧特征温度;采用Flynn-Wall-Ozawa法进行反应动力学分析.结果表明,水焦浆的着火和燃尽温度界于烟煤水煤浆和无烟煤水煤浆之间;随升温速率的升高,各样品的着火、燃尽温度升高,说明燃烧反应向高温区转移;可燃性指数随升温速率升高,表明燃烧特性提高;由动力学分析知,在同一转化率下,水焦浆的活化能低于烟煤水煤浆和无烟煤水煤浆;水焦浆具有着火难,但一旦着火,燃烧反应剧烈的特点.

上海质子重离子医院工艺冷却水及空调水系统节能设计

介绍了该工程的工艺冷却水系统及空调水系统设计中采用的多项节能措施,主要包括工艺一、二次水系统的优化和控制方式以及空调水系统中采用的水源热泵、冷却塔免费供冷等技术手段。

石油焦焦质特性对水焦浆稳定性影响的实验研究

为了优化水焦浆的稳定性,实验研究了4种石油焦成浆的静态稳定性,分析了石油焦的可磨性、表面电性和孔隙结构对水焦浆稳定性的影响规律。实验结果表明:4种不同的石油焦,在同等条件下制备水焦浆,静置7 d后,水焦浆在硬沉淀产生量和析水产生量方面呈现较大差异,浆体稳定性悬殊。不同石油焦的可磨性不同,致使各焦粉的粒度分布特征有异,焦粉粒度分布峰高且窄、粒径集中时,颗粒堆积效率低,浆体稳定性差;粒度分布峰扁平且宽、粒径均匀时,不同粒度级间能够达到较好的填充效果,颗粒堆积效率高,成浆浓度高,浆体稳定性好。石油焦颗粒表面荷电量也各不相同,焦粒Zeta电位绝对值越大,焦粒间的静电排斥力越强,越能有效的阻碍颗粒间的凝聚,从而使颗粒在浆体体系中得以稳定分散,使浆体呈现较好的静态稳定性。石油焦微观孔隙结构特征与水焦浆的稳定性之间存在一定的内在联系,石油焦比表面积越小、平均孔径越大,水焦浆的稳定性就越好。