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化工学报  2015 

TE过程闪蒸罐双时间尺度建模与动态特性分析

DOI: 10.11949/j.issn.0438-1157.20140925, PP. 186-196

Keywords: 动态建模,动态仿真,过程控制,拟稳态,双尺度建模,奇异摄动,控制性能

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Abstract:

闪蒸罐是工业常用的化工单元设备,在对其进行动态机理建模时,气相物质的动态特性方程被拟稳态处理转化为稳态代数方程,而液相仍为微分方程。由此一来,与气相相关的压力的真实动态信息无法得到,而是完全依赖于液相相态的变化。基于闪蒸罐的化工动态学机理和“拟稳态”的系统特点,通过增加快变量的动态物料守恒关系式,还原系统的气相快暂态过程,建立了TE过程闪蒸罐的双时间尺度全阶模型。利用奇异摄动方法将全阶模型精确求解后,与拟稳态模型进行了仿真对比;最后,设计了全阶模型的压力控制回路,得到很好的控制效果,验证了建模方法的合理性和工业应用价值。

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