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响应面法是一种考虑多因素的优化方法,结合Design Expert中的Box-Behnken设计方法来分析隔壁塔,并预测优化因素。运用Aspen Plus模拟,简捷计算和严格计算后,通过灵敏度功能逐个分析操作参数,在达到相同分离效果时,结果与传统二塔对比。最后,以进料位置、侧线采出位置、液相流量和气相流量为4因素,再沸器热负荷和各个产品的摩尔分数为响应值,进行试验设计分析获得全局最优值。结果表明,每个因素对响应值的影响均显著,总热负荷分别降低23.6%、18.4%,塔板数减少,成本降低。相对于隔壁塔单因素的优化,产品纯度提高,能耗也进一步降低。
Response surface methodology is a multifactorial optimization approach that combines the Box-Behnken design approach in Design Expert to analyze bulkhead towers and predict optimizations. After using Aspen Plus simulation, simple calculation and rigorous calculation, the operating parameters were analyzed one by one by the sensitivity function. When the same separation effect was achieved, the result was compared with the traditional two towers. Finally, taking the feed position, the position of the side line extraction, the liquid flow rate and the gas flow rate as 4 factors, the reboiler thermal load and the mole fraction of each product as the response values, the experimental design and analysis are conducted to obtain the global optimum value. The results showed that each factor had a significant impact on the response, the total heat load decreased by 23.6% and 18.4% respectively, the number of plates decreased and the cost decreased. Relative to the next tower single factor optimization, product purity, energy consumption is also further reduced.