摘要
以空气/含柴油污水为模拟介质体系,在环流浮选塔(外筒体内径100mm,高932mm;导流筒内径59mm,高780mm)上考察了操作气速、液相流量及浮选塔上部空间填料设置对油-水分离效率的影响.结果表明,分离效率随操作气速增大先增后降,随液体流量增大而降低;与传统空筒式浮选塔相比,环流浮选塔的分离效率比常规空筒式浮选塔有显著提高.实验确定的最佳操作气速为0.015～0.02m/s,最佳液相流量为20L/h,在环流浮选塔上部设置填料的情况下,油-水分离效率最高可达57.3%.基于实验数据建立了涉及气泡特性、液相物性、气液相流量及油滴返混影响因素在内的分离效率的经验模型,与实验值吻合较好.
The effects of gas velocity,liquid flux,and packing installed in the upper gas-liquid separation region on recovery efficiency of oil were experimentally studied in a loop flotation column. The loop flotation column was composed of an outer cylinder with inner diameter 100 mm and height 932 mm,and a inner concentric draft tube with inner diameter 59 mm and height 780 mm. Air and diesel oily wastewater were used as the media in the experiments. The results show that the recovery efficiency of oil firstly increases and then decreases with increasing the gas velocity. However,the recovery efficiency always decreases with increasing the liquid flux. Compared with the conventional cylindrical flotation column,the loop flotation column can obviously enhance the recovery efficiency of oil. The optimal operation gas velocity and liquid flux determined by the experiments are 0.015～0.02 m/s and 20 L/H,respectively. The maximum recovery efficiency of oil can reach 57.3% under the condition of packing installed in the upper region of the flotation column. Based on the experimental data,an empirical model was established which considered the effects of bubble characteristics,liquid physical properties,gas and liquid flux,and oil droplet back-mixing on the removal efficiency of oil which agreed well with the experimental data.
出处
《过程工程学报》
CAS
CSCD
北大核心
2010年第6期1110-1114,共5页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:20806090)
关键词
浮选
环流塔
含油污水
油回收率
flotation
loop flow column
oily wastewater
recovery efficiency of oil
