National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai 200237, China.
National Engineering Laboratory for Industrial Wastewater Treatment, East China University of Science and Technology, Shanghai 200237, China.
Sci Total Environ. 2021 Jan 15;752:141887. doi: 10.1016/j.scitotenv.2020.141887. Epub 2020 Aug 22.
Coke powders in the coking wastewater generated by petroleum refining industry needs to be removed to achieve water reuse for lack of water resources. This study developed a decoking hydrocyclone in the closed coking wastewater circulation treatment system to remove coke powders, which was highly efficient and environmentally friendly. Computational Fluid Dynamics (CFD) method was carried out to study the tangential velocity distribution index n-value to guide design of decoking hydrocyclone and experiment was conducted to verify the coke powders removal effect. It was found that the increase of n-value is conducive to the improvement of coke powders separation efficiency. A decoking hydrocyclone with a cone angle of 15° and an inlet size of 4 × 6 mm is the optimum hydrocyclone and the recovery efficiency of coke powders is stable at more than 90%. It is the first time for hydrocyclone successfully applied to the removal of coke powders in coking wastewater in the decoking process of petroleum refining industry, in which the separation efficiency of coke powders is considerably improved.
石油炼制行业产生的焦化废水中的焦粉需要去除，以实现水资源的再利用，因为水资源短缺。本研究在密闭焦化废水循环处理系统中开发了一种除焦水力旋流器，以去除焦粉，该方法高效且环保。采用计算流体动力学（CFD）方法研究了切向速度分布指数 n 值，以指导除焦水力旋流器的设计，并进行了实验以验证除焦效果。结果表明，n 值的增加有利于提高焦粉的分离效率。采用锥角为 15°和入口尺寸为 4×6mm 的除焦水力旋流器为最优水力旋流器，焦粉的回收效率稳定在 90%以上。这是水力旋流器首次成功应用于石油炼制行业焦化过程中焦化废水中焦粉的去除，显著提高了焦粉的分离效率。
