CAJ | 학술논문

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。
섬증관시공업상용적화공단원설비，재대기진행동태궤리건모시，기상물질적동태특성방정피의은태처리전화위은태대수방정，이액상잉위미분방정。유차일래，여기상상관적압력적진실동태신식무법득도，이시완전의뢰우액상상태적변화。기우섬증관적화공동태학궤리화“의은태”적계통특점，통과증가쾌변량적동태물료수항관계식，환원계통적기상쾌잠태과정，건립료 TE 과정섬증관적쌍시간척도전계모형。이용기이섭동방법장전계모형정학구해후，여의은태모형진행료방진대비；최후，설계료전계모형적압력공제회로，득도흔호적공제효과，험증료건모방법적합이성화공업응용개치。
In establishing the mechanistic dynamic model of flash tank, a commonly used industrial chemical unit, the liquid-phase characteristic equation is differential, while the gas-phase characteristic equation is algebraic, treated as“quasi-steady-state”. Therefore, the realistic dynamic response of pressure can not be obtained, but is completely attached to the dynamic response of the liquid-phase. In this paper, the algebraic equation of pressure was replaced with dynamic differential equation and the model to two-time scale was established. The singular perturbation method was used to precisely calculate the full-order model, and compared with the quasi-steady-state model. The control system for the established two-time scale model was designed. Compared with the performance of quasi-steady-state model, the full-order model provided better control performance, which also illustrated the rationality of modeling and its practical significance.