摘要
针对乙腈-水变压精馏稳态工艺流程,建立了变压精馏动态模型,探究了其不同的动态方案。研究表明:无论是引入回流量-塔顶采出量比例控制模块的控制结构,还是回流量-进料流量比例控制模块的控制结构,面对扰动时产品纯度均出现发散型震荡现象;温度控制结构比组成-温度控制结构的稳定时间短,但只能使水产品纯度维持在质量分数为99.88%附近;常压塔再沸器热负荷与进料流量比例控制模块能及时调整常压塔蒸汽流率;组成控制器可以在线监测产品纯度,组成-温度控制结构抗扰动能力更强。
Based on the steady-state process of the pressure-swing distillation for separating the acetonitrile-water azeotrope,a dynamic model of pressure swing distillation was established,and its different dynamic schemes were explored.The results showed that whether the control structure of the proportional control module of both the return flow and the distillate flow,or the control structure of return flow and the input flow,the product purity appeared divergent oscillation.The stability time of the temperature control structure is shorter than that of the composition-temperature control structure,but the water purity can only be maintained around 99.88wt%.The proportional control module of the reboiler heat duty of atmospheric column and feed flow can adjust the steam flowrate of atmospheric column in time.The composition controller can monitor the product purity online.The composition-temperature control structure has stronger anti-disturbance ability.
作者
杨阳阳
徐东芳
YANG Yangyang;XU Dongfang(China National Offshore Oil Corporation Petrochemical Engineering Co.,Ltd.,Qingdao 266100,China)
出处
《化工设计》
CAS
2024年第1期22-26,1,共6页
Chemical Engineering Design
关键词
变压精馏
乙腈-水
动态特性
pressure-swing distillation
acetonitrile-water
dynamic characteristics
