基于LabVIEW多效逆流蒸发工艺液位控制的研究

针对多效逆流蒸发工艺中液位非线性、大惯性和时滞性的特点,将BP神经网络与增量式PID算法相结合,以LabVIEW为开发平台,实现了多效逆流蒸发过程液位控制的动态仿真。基于物料衡算和热量衡算,建立三效逆流蒸发液位的数学模型,通过液位仿真证明基于LabVIEW实现BP神经网络PID控制系统在多效蒸发液位控制中具有良好的自适应性和鲁棒性。

The Liquid Level Control of Multi-effect Countercurrent Evaporation Process Based on LabVIEW

Aiming at liquid level control's non-linearity,large delay and time lag of the multi-effect countercurrent evaporation process,having back propagation neural network(BPNN)combined with incremental PID algorithm and the LabVIEW taken as development platform to dynamically simulate the level control of multi-effect countercurrent evaporation process was implemented,including establishment of the mathematical model for three-effect countercurrent evaporation level based on material balance and heat balance. Simulating the liquid level proves both adaptivity and robustness of this BPNN-based PID control system in liquid level control of the multi-effect evaporation process.