酸性水汽提装置节能优化研究

Energy-saving optimization of acid water stripping unit

利用Aspen Plus 7.2软件搭建了基于ELECNRTL热力学方法的基础模型,采用响应面设计得到了装置热负荷与各影响因素之间的高阶拟合回归方程,并以此为依据得到了最小装置热负荷与对应的关键优化操作参数。结果表明,当热料占比为0.900、塔底压力为400 kPa、侧线采出位置为第18块塔板、热料进料温度为145℃时,装置热负荷由7.139 MW降至6.022 MW,其降幅高达15.65%。为了有效验证上述结果的可靠性,在最佳操作条件下对实际生产装置进行现场标定,测得该装置的实际热负荷为6.036 MW,降幅约为15.45%,与预测值较为接近。本文为进一步挖掘酸性水汽提装置的节能潜力提供了可靠的理论依据与改造思路,对同类装置亦具有一定借鉴作用。

The basic model of acid water stripping unit based on ELECNRTL thermodynamics approach was established using Aspen Plus 7.2 package.The high-order fitting regression equation between heat load and influencing factors was obtained by response surface design.The minimum heat load of the device and the corresponding key optimization operating parameters were achieved on the basis of the aforementioned study.The heat duty of the optimized device was predominantly reduced from 7.139 MW to 6.022 MW with a dramatic decrease of 15.65%,while the proportion of the hot feed,the bottom pressure of the tower,the extraction position of the sideline,and the temperature of the hot feed were set to be 0.900,400 kPa,the 18 th column tray,and 145℃,respectively.In order to effectively validate the reliability of above results,the practical equipment was calibrated in the field under the best operating conditions.The heat load of the device was measured to be 6.036 MW,which was close to the predicted value,with an actual decrease of 15.45%.This paper provides a scientific and reliable theoretical basis toactivate the potential of further energy saving of the acid water stripping unit,and also offers a reference for similar units.