高氨氮废水蒸氨塔操作优化与控制

Operation optimization and control of high ammonia-containing wastewater tower

基于某企业的蒸氨系统实测基础数据,采用Aspen Plus、MATLAB、Aspen Plus Dynamic等软件,开发出了一套应用于蒸氨塔的实时优化软件。该软件通过读取实时进料流量和组成,计算出在保证废水氨浓度不大于100 mg/L、液氨质量分数>99.5%时,经济最优的塔顶馏出量、塔底热负荷和回流比,并给出合理的PID控制方案。对于蒸氨塔处理量为100 t/h的装置,以液氨3 500元/t价格计,该技术每年可产生500万元经济效益。

The wastewater with high ammonia content needs to be treated by an ammonia distillation tower system before entering the subsequent wastewater treatment system.The current operation of the ammonia distillation tower is generally conservative,leaving a large space to lift economic benefit.Based on the basic data of a certain company’s ammonia distillation system,this paper develops a set of real-time optimization software for the ammonia distillation tower by using Aspen Plus,MATLAB,Aspen Plus Dynamic and other softwares.By reading the real-time feed flow and composition,the software calculates the economic optimal cost of overhead distillation,bottom heat load and reflux ratio while ensuring the ammonia concentration in wastewater to be not more than 100 mg·L-1 and the purity of liquid ammonia to exceed 99.5%.It also gives a reasonable PID control plan.As for the unit with a treatment capacity of 100 t·h-1,this technology can save RMB5 million of cost per year at a liquid ammonia price of RMB3,500 per ton.