丙烷脱氢制丙烯工艺模拟与用能优化

Process simulation and energy optimization of propanedehydrogenation to propylene

采用丙烷质量分数为97%的液化石油气(LPG)生产丙烯,通过Aspen Plus流程模拟软件对60万t/a丙烷脱氢Oleflex工艺进行模拟与优化,并使用Aspen Energy Analyzer软件通过夹点技术对优化后的流程进行能量集成。结果表明:在模拟优化最佳工艺条件下,LPG消耗量为73.28万t/a,可生产质量分数为99.6%的聚合级丙烯产品达60万t/a;系统用能优化后,热负荷降到6.032×10^(8)kJ/h,热公用工程降幅为23.67%;冷负荷降到5.889×10^(8)kJ/h,冷公用工程降幅为30.19%;增加换热器3台,总换热面积增加了9.95×10^(3)m^(2),总成本指数降低了18.38%。

Propylene was produced using liquefied petroleum gas(LPG)with a propane mass fraction of 97%.The Oleflex process of 600 kt/a propane dehydrogenation to propylene was simulated and optimized by Aspen Plus process simulation software,and then the energy integration of the optimized process was performed by Aspen Energy Analyzer software through pinch technology.The simulation results showed that under the optimized process operation,the consumption of LPG was 732.8 kt/a,and 600 kt/a of 99.6%polymer grade propylene was produced.After the optimization of system energy consumption,the heating load was reduced to 6.032×10^(8)kJ/h;the thermal utility was decreased by 23.67%;the cooling load was reduced to 5.889×10^(8)kJ/h;the cooling utility was reduced by 30.19%.Three heat exchangers were added.The total heat exchange area increased by 9.95×10^(3)m^(2),and the total cost index decreased by 18.38%.