海上油基钻屑电磁热脱附装置投料量与脱附时间的优化研究

Feed Rate and Reaction Time of Electromagnetic Thermal Desorption Device for Offshore Oil-based Drilling Cuttings

油基钻屑为黑色黏稠状固体,含油率为16%,含水率为17%,含固率为67%,无可见的游离液体。在热脱附过程中,随着温度升高,油基钻屑中的水和低馏点石油烃首先蒸发,钻屑黏度逐渐升高,搅拌电机电流上升。温度达到350℃时,高馏点的石油烃开始蒸发,含油率逐渐下降,钻屑黏度也逐渐降低,搅拌电机电流下降,因此搅拌电机电流可以直观反映钻屑含油率的变化过程。研究结果表明,脱附时间为800s,最大投料量为400kg时,固相的含油率小于1%,达到GB 4914-2008《海洋石油勘探开发污染物排放浓度限值》中一级海域的排放标准;脱附时间为1200s时,固相含油率均小于0.3%。经过计算,当进料量为400kg、脱附时间为800s时,达标处理量最高为1.8 t·h^(-1)。

Oil based drilling cuttings were black viscous solids with oil content of 16%,water content of 17%and solid content of 67%.There was no free liquid.In the process of thermal desorption of oil-based drilling cuttings,with the increase of temperature,water and low boiling point petroleum hydrocarbons in drilling cuttings evaporated first,the viscosity of drilling cuttings gradually increased,and the current of mixing motor increased.When the temperature reached 350℃,the high boiling point petroleum hydrocarbon began to evaporate,the oil content decreased gradually,the viscosity of drilling cuttings also decreased gradually,and the current of mixing motor decreased.It could be seen that the current of mixing motor could directly reflect the change process of oil content of drilling cuttings.The research results showed that when the desorption time reached 800s,the maximum feeding amount was 400 kg,the solid oil content was less than 1%,which met the first-class sea area discharge standard in GB 4914-2008《Emission concentration limits of pollutants from offshore oil exploration and development》.When the desorption time was 1200 s,the oil content was less than 0.3%.After calculation,when the feed amount was 400kg and the reaction time was 800s,the standard treatment capacity reached the highest 1.8 t/h.