250万吨/年常减压装置湿式减压塔的工艺设计

Process Design of Wet Vacuum Tower in 2.5 Mt/a Atmospheric and Vacuum Distillation Unit

针对目前减压塔拔出率低、能耗较高的问题,阐明了提高湿式减压塔拔出率的措施。根据已知的重油的物性数据及产品的质量要求等给定数据,确定减压塔各抽出线的产率;通过物料衡算,确定塔顶压力为60 mmHg和50 mmHg进料温度、各侧线的抽出温度。同时计算出湿式减压塔塔板间距及塔径,并确定了减压塔的最大气相负荷及液相负荷的位置、减压塔最大允许线速、适宜线速、空塔截面积、降液管截面积、塔横截面积及塔径。

Aiming at the problems of low distillate yield and high energy consumption in the vacuum tower,the measures to improve the distillate yield of wet vacuum tower were put forward.According to physical property data of heavy oil and product’s quality requirements,production rate of each side-draw plate of vacuum tower was determined.Through the material balance calculation,feed temperature and extracting temperature of each side-draw plate were determined under top pressure 60 mmHg or 50 mmHg.Tray spacing and tower diameter of the wet vacuum tower were calculated,and the location of maximum gas load and liquid load in the vacuum tower was determined as well as maximum permission speed,appropriate speed,empty tower cross-sectional area,downcomer cross-sectional area,tower cross-sectional area and column diameter of the vacuum tower.