烷基化装置脱异丁烷塔节能优化研究
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摘要
烷基化装置主要由选择性加氢、脱轻烃塔、烷基化反应、酸烃分离、循环异丁烷塔和脱异丁烷塔等部分组成,而脱异丁烷塔是装置的主要蒸汽用户,对该塔进行用能分析,可进一步挖掘装置潜力。基于某厂烷基化装置的脱异丁烷塔实际数据进行建模分析,考察回流比及进料温度对脱异丁烷塔的影响,并通过热力学分析,提出对该塔增设中间再沸器的优化方案。模拟值与实际值误差在5%以内,模拟值与实际值吻合较好。基于该模型,在第59块板和第60块板之间增设中间再沸器,利用低温热水作为再沸器热源。优化后,回流比为0.766,进料温度为50℃,可节省再沸器热负荷5603kW,折合1.0MPa(表)蒸汽8.52t/h,每年节能效益为1288.22万元。通过新增中间再沸器,可为石化炼油企业提供新的热阱,有利于提高全厂低温热利用率。
An alkylation unit mainly consists of selective hydrogenation,light hydrocarbon removal column,alkylation reaction,acid-hydrocarbon separation,cyclic isobutane column and deisobutanizer.Deisobutanizer is a major steam consumer in the unit,so analyzing its energy consumption can further tap the potential of the unit.A simulation model was established based on the actual data of the deisobutanizer in an alkylation unit,the influence of mass reflux ratio and feed temperature on the deisobutanizer was analyzed,and an optimum proposal of adding intermediate reboiler to the column was presented through thermomechanical analysis.The error between the simulated results and the actual results was within 5%,and the simulated results agreed well with the actual results.Based on this model,an intermediate reboiler was added between the 59 thtray and the 60 thtray,and low temperature hot water was used as the reboiler heat source.After the optimization,the mass reflux ratio was 0.766,the feed temperature was 50℃,the heat load of reboiler was saved by 5603 kW,equivalent to 8.52 t/h of 1.0 MPag steam,and the energy saving benefit was 12.8822 million yuan each year.By adding an intermediate reboiler,a new heat trap is provided for refining and petrochemical enterprises,which is beneficial to improving the utilization rate of low temperature heat.
An alkylation unit mainly consists of selective hydrogenation,light hydrocarbon removal column,alkylation reaction,acid-hydrocarbon separation,cyclic isobutane column and deisobutanizer.Deisobutanizer is a major steam consumer in the unit,so analyzing its energy consumption can further tap the potential of the unit.A simulation model was established based on the actual data of the deisobutanizer in an alkylation unit,the influence of mass reflux ratio and feed temperature on the deisobutanizer was analyzed,and an optimum proposal of adding intermediate reboiler to the column was presented through thermomechanical analysis.The error between the simulated results and the actual results was within 5%,and the simulated results agreed well with the actual results.Based on this model,an intermediate reboiler was added between the 59 thtray and the 60 thtray,and low temperature hot water was used as the reboiler heat source.After the optimization,the mass reflux ratio was 0.766,the feed temperature was 50℃,the heat load of reboiler was saved by 5603 kW,equivalent to 8.52 t/h of 1.0 MPag steam,and the energy saving benefit was 12.8822 million yuan each year.By adding an intermediate reboiler,a new heat trap is provided for refining and petrochemical enterprises,which is beneficial to improving the utilization rate of low temperature heat.
引文
[1]刘利，方丽.硫酸法烷基化装置节能降耗措施[J].炼油与化工，2017,28(2):65-67.
[2]曹飘，郑伟中，孙伟振，等.离子液体/硫酸催化C4烷基化反应过程强化——表界面特性研究[J].化工学报，2018,69(11):4832-4839.
[3]刘初春.气体分馏、MTBE、烷基化装置组合优化，提高碳四资源利用水平[J].当代石油化工，2016,24(12):15-20.
[4]刘永强.烷基化原料方案的工艺优化[J].广东化工，2015,42(10):229-230.
[2]曹飘，郑伟中，孙伟振，等.离子液体/硫酸催化C4烷基化反应过程强化——表界面特性研究[J].化工学报，2018,69(11):4832-4839.
[3]刘初春.气体分馏、MTBE、烷基化装置组合优化，提高碳四资源利用水平[J].当代石油化工，2016,24(12):15-20.
[4]刘永强.烷基化原料方案的工艺优化[J].广东化工，2015,42(10):229-230.
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