基于PID控制器燃烧室的过程控制

Process Control of the Combustor Based on PID Control

基于PID控制算法和有限元计算技术,利用COMSOL Multiphysics多物理场耦合软件流体流动以及稀物质传递模块建立了燃烧室气体流动和质量传递模型,并采用其全局常微分方程和微分代数方程模块建立了燃烧室的PID控制模型。通过改变有较低氧浓度气体的流入速度以获得在燃点的最佳氧气浓度,并且找到最优的PID参数。结果表明,在PID控制参数中,比例因子取值越少,其控制过程振荡越剧烈,趋于稳定耗时越久。因此,选取一个相对较高的比例因子可以获得一个更稳定的过程控制。

In this paper,based on PID control algorithm and finite element computing technique,the Laminar Flow module in COMSOL Multiphysics software is used to bulid the model of gas flow,the Transport of Diluted Species module is applied to bulid the model of mass transfer,and the Global ODEs and DAEs module is adopted to bulid PID control model in the combuster.The control algorithm alters the inlet velocity of the gas with the lower oxygen content to achieve the desired total concentration at the ignition point,and to find the optimal PID parameters.The results show that the results evaluated for the smaller scale factor value in PID control algorithm oscillate more before stabilizing.Thus,it is clear that in the PID process control the higher kP value yields a more stable process control.