降低催化干气中C_3^+含量的Aspen plus模拟

Reduction of C_3^+ in FCC dry gas by Aspen Plus simulation

介绍中国石油天然气股份有限公司独山子石化分公司降低催化裂化干气中C_3^+组分含量的优化措施,采用流程模拟软件调整了相关物流的入塔条件以达到预期优化目标。该公司800 kt/a催化裂化装置在2016年某段时间干气中C_3^+组分体积分数接近4%,为了降低干气中的C_3^+组分含量,提高液态烃的收率,采用Aspen plus流程模拟软件建立了吸收稳定系统的模拟流程,并在对装置实际生产数据进行分析的基础之上,合理调整了吸收稳定系统中相关物流的入塔流量和入塔温度。通过模拟优化分析,将补充吸收剂的入塔量调节至37.8 t/h,补充吸收剂的入塔温度下调至32℃,粗汽油的入塔温度调节至38℃,贫吸收油的入塔量调节至30.7 t/h,贫吸收油的入塔温度调节至36℃,模拟结果表明:干气中C_3^+体积分数可降至1.49%,催化裂化装置参照模拟数据调整优化后干气中C_3^+体积分数可降至1.64%,提高了装置的整体效益,达到了预期效果。

The optimization and measures for the reduction of C3^＋ in FCC dry gas of Petro China Dushanzi Petrochemical Co.,Ltd. are introduced,and the conditions of process streams entering the tower are adjusted by process simulation software,and the expected optimization objectives have been reached. The C3^＋ in the800,000 TPY FCC unit was close to 4% in a certain period of 2016. To reduce C3^＋ content in the dry gas and raise the yield of liquid hydrocarbons,Aspen Plus process simulation software was applied to build up the simulated process flow of absorption and stabilization system. Based upon the analysis of actual production data of the 800,000 TPY FCC unit,the inlet flowrate and temperature of process streams into the tower of absorption stabilization system were appropriately adjusted. Through the analysis of simulation and optimization,the absorbent inlet flow was adjusted to 37. 8 t/hr,the absorbent inlet temperature was lowered to 32 ℃,the temperature of crude gasoline into the tower was adjusted to 38 ℃,and the inlet flow of lean absorption oil was adjusted to 30. 7 t/hr. The inlet temperature of lean absorption oil was adjusted to 36 ℃. Based upon the simulation results,C3^＋ in the dry gas can be reduced to 1. 49%. After optimization of the FCC unit based upon simulation data,the C3^＋ in FCCU is lowered to about 1. 64%,the economic benefit of the unit is improved and expected results have been obtained.