基于流程模拟的催化裂化吸收稳定系统分析与操作优化

SYSTEM ANALYSIS AND OPERATION OPTIMIZATION FOR THE ABSORPTION AND STABILIZATION SYSTEM IN A FCC UNIT BASED ON PROCESS SIMULATION

以典型的吸收稳定四塔流程作为研究对象,通过流程模拟软件PRO/Ⅱ模拟计算结果与装置标定数据的对比分析,确定模拟过程的热力学方法为SRK,并对参数进行规定。在确定吸收稳定系统干气、液化气和稳定汽油等产品质量的条件下,对各影响因素进行分析,研究其对系统能耗和吸收效果的影响,得到系统优化的操作参数为:补充吸收剂流量29t/h,系统操作压力1.4MPa,稳定塔进料位置和温度分别为第12块理论板和138℃,解吸塔热、冷进料流量比为7∶3。模拟计算结果表明,通过优化操作参数,可使系统冷热负荷分别降低约4%和5%。

Taking a typical absorption and stabilization system with four towers as research object, by comparing the calculation results from PRO/Ⅱ simulation software and the calibration data of the practical unit,parameters in the simulation are determined and SRK method is adopted to optimize simu lation. In the premise of the specific qualities of dry gas, LPG and gasoline, the effect of operation param eters on the energy consumption and absorption results is studied, and the optimized operation parameters are obtained as follows：a complementary absorbent flow rate of 29 t/h,a system operation pressure of 1.4 MPa,the flow rate ratio of hot and cold feeds for the desorption tower is 7 to 3,and the feed inlet location and temperature of the stabilization tower is at 12^th theoretical tray and 138 ℃, respectively. The simulation results demonstrate that by optimizing operation parameters,the cooling duty and heating du ty of the unit is reduced about 4% and 5 % ,respectively.