焦化装置吸收稳定系统模拟与优化

应用Aspen Plus模拟软件对延迟焦化装置吸收稳定系统进行模拟计算,并在此基础上分析系统操作变量对干气中C3组分含量的影响,对操作参数进行了优化：提高补充吸收剂量至33 t/h,增加解吸塔冷进料量至25.32t/h,降低稳定塔回流比至2.0,降低解吸塔塔底温度至130℃,提高稳定塔塔底温度至168.48℃。计算结果显示,干气中C3组分摩尔分数由9.52%减少至6.00%。结合装置内的低温热资源,提出应用溴化锂吸收制冷技术降低系统吸收剂温度,减少干气中C3组分含量,并提出两套可行的技术方案。

Simulation and optimization of absorption-stabilization system of delayed coking unit

The Aspen Plus simulation software was applied to simulate and calculate the absorption-stabilization system of delayed coking unit.The impacts of several operational variables of the system on the C3 content in dry gas were analyzed,and operational parameters were optimized,such as： increasing absorbent addition to 33 t/h,raising feed flowrate of desorber to 25.32 t/h,reducing reflux ratio of stabilizer to 2.0,lowering desorber bottom temperature to 130 ℃ and raising stabilizer bottom temperature to 168.48 ℃.The calculation results showed that the mole fraction of C3 in dry gas was reduced to 6.0% from 9.52%.In consideration of low-temperature resources in the unit,the absorbent lithium bromide refrigeration technology was proposed to lower the temperature of absorbent and reduce the C3 in dry gas.Two practical technical solutions were recommended.