全闭式热风循环密集烤房温度控制系统研究

Temperature Modeling and Control Simulation of Full Closed Hot Air Circulation Tobacco Bulk Curing Barn

目前使用的密集烤房采用开放式排湿方式,存在烟叶香气成分流失和排湿气流余热损失等局限.在此种背景下,设计了一种采用全闭式热风循环方式的烟叶密集烤房,以提高烟叶烘烤质量且避免密集烤房排湿气流余热的损失.同时,根据能量守恒定理,建立了全闭式热风循环密集烤房温度控制系统的数学模型,得到了系统的温度控制传递函数.在此基础上,采用基于Sobol序列实数编码遗传算法的PID控制策略,对密集烤房温度控制系统进行了仿真及实验.仿真及实验结果表明:对于惯性大、非线性、时滞大、时变性的烟叶密集烤房温度控制系统,基于该算法的PID控制具有较好的稳定性和动态特性,密集烤房温度控制系统动态响应快、稳态精度高、超调量小.

At present,the open humidification method is used in the intensive roast room,which has some limitations,such as the loss of the aroma components of the tobacco leaves and the waste heat loss of the exhaust air flow.In this background,a tobacco intensive curing barn with totally closed hot air circulation is designed to improve the curing quality of tobacco leaves and avoid the loss of residual heat in the bulk curing barn.Meanwhile,according to the law of conservation of energy,a mathematical model of the temperature control system of the closed hot air circulation bulk curing barn is established,and the temperature transfer function of the system is obtained.On this basis,the PID control strategy based on Sobol sequence real coded genetic algorithm is used to simulate and experiment the temperature control system of dense roast house.The simulation and experimental results show that for large inertia,nonlinear,large delay,time-varying tobacco barn temperature control system,the PID control algorithm has better stability and dynamic characteristics based on the barn temperature control,high accuracy,small overshoot of system dynamic response.