延迟焦化分馏塔模拟与侧线取热优化研究

Simulation and optimization of energy recovery for sidedraw of main fractionators of delayed coking unit

为更加合理利用装置过剩能量,以某延迟焦化装置主分馏塔为研究对象,利用流程模拟软件Aspen Plus建立模型,在此基础上应用分析方法对主分馏塔侧线取热进行优化研究。结果表明:模拟计算结果与现场标定值吻合较好,最大相对偏差为5.33%,满足工程计算要求;合理增大高温位取热量,减少低温位取热量,可提高分馏塔过剩热量有效利用程度,降低分离过程损失。在保证产品采出量及质量前提下,优化调整延迟焦化分馏塔各回流取热比例,使分馏塔过剩余热工艺取热提高了1.07 MW。

To properly and fully use the excessive energy of units, simulation and energy-utilization opti- mization of exergy analysis are made for the main fractionator of a delayed coker by process simulation software Aspen Plus. The optimization of heat removal from sidedraw of main fractionators was studied by exergy analy- sis. The simulation results coincide well with the measured values. The maximum error is 5.33% , which meets the requirement of engineering calculation. The proper increase of high-temperature heat removal and reduction of low-temperature heat removal can improve the utilization efficiency of excessive heat and reduce the exergy loss of the fractionators. The exergy of excessive energy recovery for the delayed coking fractionator could be increased by 1.07 MW through optimization of the energy recovery ratios without any impact on prod- uct quantity and quality. The energy utilization of the main fractionators is effectively improved.