Aspen Plus模拟热耦合变压汽提工艺优化糠醛精制装置脱水塔  

OPTIMIZATION OF DEHYDRATION COLUMN IN FURFURAL REFINING UNIT BY THERMAL COUPLED VARIABLE PRESSURE STRIPPING PROCESS BASED ON Aspen Plus

作　　者：魏川林 Wei Chuanlin(Shandong Jilian Petrochemical Engineering Co.,Ltd.,Jinan 250000)

机构地区：[1]山东济炼石化工程有限公司,济南250000

出　　处：《石油炼制与化工》2024年第12期141-146,共6页Petroleum Processing and Petrochemicals

摘　　要：糠醛精制装置脱水塔一般采用单塔汽提工艺,由于脱水塔塔顶温度和压力较低,常规技术无法较好地回收塔顶气热量。运用Aspen Plus软件,基于NRTL热力学模型对脱水塔系统进行模拟计算,根据共沸温度的变化确定采用热耦合变压汽提工艺的可行性。对比分析常规汽提工艺和热耦合变压汽提工艺,以年总费用(C_(TA))作为评价指标,同时考虑降低一次投资,优化了热耦合变压汽提工艺低压塔和高压塔的塔板数、高压塔的操作压力等参数,推荐低压塔理论塔板数设置为4,高压塔理论塔板数设置为8,高压塔操作压力在230~305 kPa之间。与常规单塔汽提工艺相比,热耦合变压汽提工艺设备总成本增加32.1%,年运行费用减少28.1%,C_(TA)减少22.9%,热耦合变压汽提工艺具有较明显的经济优势。The dehydration column of furfural refining unit generally adopts single-column stripping process.Because of the low temperature and pressure at the top of the dehydration column,the heat of the gas overhead can not be well recovered by conventional technology.Based on the NRTL thermodynamic model,Aspen Plus software was used to simulate the dehydration column system,and the feasibility of adopting the thermal-coupling variable pressure swing stripping process was determined according to the change of azeotropic temperature.Comparing and analyzing the conventional steam stripping process and the thermal-coupled pressure swing steam stripping process,taking the annual total cost(C_(TA))as the evaluation index,and considering the reduction of the initial investment,the parameters such as the number of trays and the operating pressure of the low-pressure column and high-pressure column were optimized.The theoretical trays of the low-pressure column were recommended to be set to 4,the theoretical trays the high-pressure column were set to 8,and the operating pressure of the high-pressure column should be between 230 and 305 kPa.Compared with the conventional single-column stripping process,the total cost of equipment in the thermal coupling pressure swing stripping process is increased by 32.1%,the annual operating cost is decreased by 28.1%,and the C_(TA)is decreased by 22.9%.The thermal coupling pressure swing stripping process has significant economic advantages.

关 键 词：糠醛精制 变压汽提 热耦合 模拟优化 节能降耗 脱水塔 

分 类 号：TQ053.5[化学工程] TQ251.11