燃气锅炉燃烧效率优化控制仿真研究

Simulation on the Optimal Control of Gas Boiler Combustion Efficiency

对燃气锅炉燃烧效率优化控制的研究不仅能够提高燃烧的效率减少能源的浪费,更能减少污染对环保大有裨益,但燃气锅炉具有非线性、大惯性、多变量等特点,针对这些特点并对燃气锅炉燃烧控制系统进行分析,采用两输入两输出,设计了由燃料控制系统和送风控制系统共同构成的温度控制系统,并且在此系统中加入了检测烟气含氧量的方法,来实现燃气量和空气量的最佳空燃比控制,在保证供水温度的同时也提高燃烧效率。最后在系统中采用了自抗扰控制(Active Disturbance Rejection Control,ADRC)算法,并在MATLAB中搭建仿真与常规PID进行对比,证明ADRC控制比常规PID有着更为优良的动态性能指标,从而提高了燃烧效率,减少了污染与能源浪费。

Research on optimization control for combustion efficiency of gas boiler can reduce energy waste and pollution. However, the gas boiler has the characteristics such as nonlinearity, great inertia and multivariate. In this paper, we analyzed the combustion control system of gas boiler aiming at these characteristics. Firstly, we used stream input and two outputs to design the temperature control system consisting of fuel control system and blowing-in system, and introduced the detection method of oxygen content in flue gas into the system to achieve the optimal air- fuel ratio control of fuel gas quantity and air quantity. Then, we ensured the supply water temperature and improved the combustion efficiency in the meantime. Finally, we used the active disturbance rejection control in the system and set up the simulation to compare with the common PID. It proves that the ADRC control has more excellent dynamic performance index compared with common PID. Thus, it improves the combustion efficiency and reduces the pollution and energy waste.