CTST塔板在吸收稳定系统改造中的应用

Application of combined trapezoid spray tray in absorption-stabilization system

中国石化湛江东兴石油化工有限公司采用立体传质塔板(CTST)对Ⅰ套重油催化裂化装置、Ⅱ套重油催化裂化装置的吸收塔、解吸塔和稳定塔进行扩大加工能力改造。对Ⅰ套催化裂化装置、Ⅱ套催化裂化装置吸收稳定系统进行了模拟计算和CTST水力学计算,提出了扩大加工能力改造的方案:两套装置的吸收塔、解吸塔和稳定塔,各塔塔壳利旧,塔板层数不变,支撑件不更换,仅每层塔板更换为CTST。改造后两套装置重油加工能力分别由0.3 Mt/a和1.2 Mt/a,增加到0.5 Mt/a和1.5 Mt/a;Ⅰ套催化裂化装置稳定塔液化石油气中C2体积分数小于0.03%,C+5体积分数小于0.02%,稳定汽油中无C3,C4组分,稳定汽油饱和蒸汽压为63.7 k Pa;Ⅱ套催化裂化装置稳定塔液化石油气中C2体积分数为0.03%,C+5体积分数为0.08%,稳定汽油中无C3,C4组分,稳定汽油饱和蒸汽压不大于65 k Pa,取得了良好的改造效果。

The Combined Trapezoid Spray Trays （CTST） have been successfully used in the expansion revamping of absorbers, desorbers and stabilizers in the FCCU Ⅰand FCCU Ⅱ of SINOPEC Zhanjiang Dongxing Petrochemical Co. Ltd. The revamping scheme has been proposed based on computer simulation and the calculation of fluid dynamic performance： The floating trays are replaced with CTST without changing sup- porting parts of absorbers, desorbers, stabilizers in FCCUⅠ and FCCU Ⅱ. After revamping, the capacity of FCCU Ⅰ is increased from 0.3 million tons to 0.5 million tons a year and the capacity of FCCU Ⅱ is in- creased from 1.2 million tons to 1.5 million tons a year. In the FCCU Ⅰstabilizers, the C2 and C5 in LPG are less than 0.03% and 0.02% respectively. The C3 and C4 in the stabilized gasoline is zero, and the saturated vapor pressure of stabilized gasoline is 63.7 kPa. In the FCCU Ⅱ stabilizers , the content of C2 is 0.03% and the content of C5 and plus is 0.08% in LPG. The C3 and C4 in the stabilized gasoline is zero, and the saturat- ed vaoor pressure of stabilizedgasoline is ≤65 kPa.