三元前驱体废水汽提蒸氨工艺优化研究  

Discussion on the Process of Steam Stripping Ammonia from Ternary Precursor Wastewater

作　　者：张旭 ZHANG Xu

机构地区：[1]中国恩菲工程技术有限公司,北京100038

出　　处：《绿色矿冶》2023年第2期55-59,69,共6页Sustainable Mining and Metallurgy

摘　　要：目前比较普遍的三元前驱体废水汽提脱氨工艺有两种,一是采用配置有再沸器与冷凝器的精馏塔,并向再沸器中通入饱和蒸汽作为热源,二是采用只配置冷凝器但无再沸器的精馏塔,并直接从精馏塔底部通入饱和蒸汽作为热源。这两种工艺存在能耗偏高或排向下游废水处理量较大的问题。因此,本文提出了一种优化工艺路线,即配套再沸器但无冷凝器的精馏塔进行蒸氨操作,充分利用精馏塔塔顶蒸汽和塔釜出料液与原料废水进行合理换热,且经过换热后的原料液从精馏塔塔顶进料。并应用Aspen Plus工艺流程模拟软件,对优化工艺与上述两种传统工艺进行模拟计算和指标对比。建模时采用ELECNRTL热力学模型和等效变换以加快收敛。模拟结果表明,优化的工艺结合了两种传统工艺的优点,不但避免了蒸汽热源直接接触物料,使蒸氨塔塔釜废水量减少,而且充分利用了蒸氨塔塔顶蒸汽和塔釜出料液的余热,使整个系统的能耗降低。At present,there are two common types of ternary precursor wastewater stripping and deamination processes.One is to use a distillation tower equipped with a reboiler and condenser,and inject saturated steam into the reboiler as a heat source.The other is to use a distillation tower equipped with only a condenser but no reboiler,and directly inject saturated steam from the bottom of the distillation tower as a heat source.These two processes have the problem of high energy consumption or a large amount of wastewater treatment discharged downstream.Therefore,this article proposed an optimized process route,which is to use a distillation tower with a reboiler and no condenser for ammonia distillation operation,fully utilizing the steam at the top of the distillation tower and the outlet liquid from the tower kettle for reasonable heat exchange with raw material wastewater,and the raw material liquid after heat exchange enters from the top of the distillation tower.And Aspen Plus process simulation software was used to simulate and compare the optimized process with the two traditional processes mentioned above.When modeling,ELECNRTL thermodynamic model and equivalent transformation were used to accelerate convergence.The simulation results indicate that the optimized process combines the advantages of two traditional processes,not only avoiding direct contact between steam heat sources and materials,but also reducing the amount of waste water in the ammonia tower kettle;Moreover,it fully utilizes the residual heat of the steam at the top of the ammonia distillation tower and the effluent from the tower kettle,thereby reducing the energy consumption of the entire system.

关 键 词：锂电池 三元前驱体 废水 汽提脱氨 Aspen Plus 流程模拟 

分 类 号：TF815[冶金工程—有色金属冶金] TM912[电气工程—电力电子与电力传动] X703[环境科学与工程—环境工程]