重整装置分离系统有效能分析

Exergy analysis for reforming unit separation system

对中国石油化工股份有限公司洛阳分公司重整装置进行研究和分析,结合装置实际情况,提出了节能优化措施建议。应用Aspen Plus软件对重整装置进行建模与模拟,通过[火用]分析技术对现有流程进行有效能评价,发现具有较大的节能潜力。将有效能作为因变量对脱戊烷塔进行操作参数研究与优化,得到最佳的操作参数,并将进料温度提高15℃,可节省燃料气1050 t/a;提出充分利用预分馏塔顶油气热量与高压吸收罐底低温液体换热的改造方案,改造后脱戊烷塔进料换热器的[火用]效率从72.16%提高至81.31%,并进一步提高了稳定汽油进入下游装置的温度,从而降低下游装置能耗;提出了耐腐蚀新型空气预热器更换方案,排烟温度降至100℃,加热炉效率可从93%提高至94%,具有良好的节能效果。

The reforming unit of SINOPEC Luoyang Company is studied and analyzed.Combined with the actual situation of the unit,optimal revamping measures of energy-saving are proposed.Aspen Plus software is used to build model and simulate the reforming unit.Based on the exergy analysis,the existing process is evaluated,and it is found that it has great energy-saving potential.The best operation parameters of depentanizing column are obtained with optimization.The feed temperature is increased by 15℃,and the fuel gas saving is 1050 TPY.A scheme of making full use of the heat of oil and gas on the top of the pre-fractionation column and the low-temperature liquid heat exchange at the bottom of the high-pressure absorption tank is recommended.After transformation,the exergy efficiency of the feed heat exchanger of the depentanizing column is increased from 72.16%to 81.31%,and the energy consumption of downstream device is reduced along with the temperature rise of stable gasoline.Furthermore,new anti-corrosion air preheater schemes are put forward.The heater flue gas temperature is dropped to 100℃.The efficiency of furnace could be raised from 93%to 94%.The energy-saving effect is significant.