原油掺淡水洗盐的精确计算方法

The Accurate Calculation Method of Crude Oil Desalting by Fresh Water Blending

原油脱盐处理工艺主要是采用掺入淡水洗盐。生产中为了节省掺水量以及保证洗盐效果,均将二级电脱盐后的采出水回掺到一级电脱水前,此时粗略计算已经不能满足新鲜水掺入量的计算要求。精确计算需要采用假定及计算结果对比的方法,认为在电脱水器及电脱盐器中存在水的不均匀掺混,且其污水出口含盐浓度低于油入口及出口中水的矿化度。采用精确计算方法能够更好地体现流程上各点的矿化度,有利于结合运行参数分析各点结垢及腐蚀情况,并且能够得到准确的掺水量,以达到减少淡水掺入量,降低污水处理负荷的目的,能够更好地保证原油处理工艺的正常运行。

For on- stream crude oil desalting is necessary besides dehydration, fresh water blending is the major method for crude oil desalting. In order to save the fresh water and guarantee the effect of desalting,effluent after the 2nd stage desalting blends to the inlet of 1st stage desalter where the common calculation cannot meet the requirement of fresh water capacity calculation.The accurate calculation use assumption and calculation results comparison methods, assuming the existing of uneven water blending and the effluent salinity is lower than oil inlet and outlet in the electric dehydrator and the electric desalter.The accurate calculation method can provide the accurate blending capacity and the salinity of each point in the processing, thus can help analysis the scaling and corrosion condition, reduce the fresh water and effluent treatment capacity,which will benefit the crude oil processing.