电厂改造中图像处理和模糊控制的应用研究

为提高锅炉燃烧系统效率和节能效果,根据所采集的火焰状况采用火焰图像处理并结合专家系统开发了火焰的检测与控制技术。通过对大型锅炉多层4角燃烧器火焰图像的检测、处理、特征提取、模式识别等方法与技术,实现了在确定系统最优性能指标的情况下的模糊控制技术,使锅炉燃烧效率比以往的间接控制方式有明显的提高。同时,对于送风、引风、给煤等过程的大功率电气设备在优化燃烧控制的基础上采用变频调速技术,使得送风、引风、给煤在满足机组锅炉风煤比、炉膛负压、过热蒸汽焓与压力等控制条件下获得电能的最优分配。

Energy-saving Reform of Power Station by Image Processing Expert System and Fuzzy Control

In view of the continued improvement in image and graphics technology,fuzzy control has its superiority in combustion process control which has many uncertain factors.This paper puts forward a detecting and control technique which combines flame images disposal and expert's system based on the situation of flame pictures,and close combines the image processing and fuzzy control in steam turbine generating set's boiler burning unit.For boiler combustion control,the optimum combustion process depends on the ratio of air and fuel(air-coal ratio),and the rational allocation of wind in combustion process and the chamber negative pressure.This paper describes the optimal combustion conditions in the combustion control system by controlling the air-coal ratio,the rational allocation of wind in combustion process and the chamber negative pressure through frequency control under fuzzy control based on the image processing expert system.Through the technique of image detecting,disposal,character pick-up,mode identify and so on,with the flame of big multi-layer four-cape burner,it is easy to realize the boosting of combustion efficiency by adopting fuzzy control technique under certain optimization system capability index.Meanwhile,by adopting speed-adjusted on frequency conversion to the high-power electricity devices during the period of sending breeze,and by giving coal which fulfils the boiler of breeze coal rate,hearth negative pressure and steam-gas enthalpy,the allot of electric energy will be optimized.