含油污泥的废油置换脱水特性

Fry-drying of oily sludge via spent lubricating oil of vehicle

以辽河油田的含油污泥为研究对象,提出了利用车用废润滑油高温置换脱水的新方法。本文对置换脱水过程中,废油在含油污泥内部的渗透情况进行了研究,并考察了油温、含油污泥样品尺寸及初始水含量等因素对脱水过程中含油污泥油、水含量变化的影响。研究结果表明,在置换脱水过程中,吸入的车用废润滑油首先进入含油污泥试样表面,随后逐渐向内部渗透;含油污泥样品的油含量随时间延长经历减量期、增量期及基本恒定期三个阶段,其中增量期为吸油的主要阶段。油温及试样尺寸等因素对置换脱水过程中含油污泥样品的油含量有一定的影响,但对脱水含油污泥样品的最终油含量影响不大;含油污泥的最终油含量受其初始水含量的影响较大。因此,通过对含油污泥试样进行预干燥处理,可有效减少其在废油置换脱水过程中的吸油量。

The fry-drying method was used to dry oily sludge from Liaohe oilfield,and spent lubricating oil of vehicle（SLOV）was used as frying medium.The permeation process of SLOV in the oily sludge sample during the fry-drying process was studied.The effects of oil temperature,size and initial moisture content of oily sludge sample on the change of its oil and water contents were also investigated.At the initial stage of the fry-drying process,SLOV entered the interface with oily sludge sample,and then permeated into oily sludge sample gradually.During the whole fry-drying process,the oil content change of oily sludge could be divided into three periods,i.e.decreasing period,increasing period and essentially constant period.Most of the oil uptake was sucked by oily sludge sample during the increasing period.The temperature of frying SLOV and size of sample affected the oil content of oily sludge sample during the fry-drying process,but the effect on final oil content of oily sludge sample was not obvious.The final oil content of oily sludge sample was affected greatly by initial moisture content of the sample.Therefore,pre-drying would be a useful method to reduce the amount of oil uptake by oily sludge.