Optimization Research On The Control System Of 220t/h And 410t/h Master Boiler

Recently fossil fired power generation,the major component of the power generation enterprises,has been impacted constantly by the clean energy,such as photovoltaic,hydro,wind and nuclear power stations.The units with the capacity less than 200 MW have been shut down due to the high running cost and severe pollution problem.Even though the unit capacity at Hong Wei Thermal Power Plant is also low,they operate as cogeneration which was encouraged by the government to develop centralized heat supply by small units.The control strategy of these parallel operated boilers were the object of this paper,the defects and shortages of the original control scheme were discussed,and the optimized and more suitable control strategy was discussed and designed for common header boiler system.Firstly,by analyzing the dynamic characteristics of the boiler combustion system,a reasonable boiler load distribution and keeping economic operation viewpoint is proposed.The key to solve the problem is to maintain the pressure of the main steam header pressure at the rated value,then to keep the coal mill at the optimum condition by distributing the coal feeding reasonably.The wavelet denoising technology was applied in data preprocessing in order to identi fy of the main steam header pressure system efficiently and accurately,the least square method was used in recognition comparison test to ensure the modeling accuracy,the identification error was greatly reduced.Secondly,the original 410 t/h boiler combustion control system could not be put in automatic control,therefore huge amount of operation work load was caused by controlling the system manually.The main steam header pressure fluctuates frequently due to the manual operating error.The advanced intelligent control technology was utilized in this study to design the 410 T/ H steam header pressure control,urnace pressure control and secondary air actuator control methods.The comparatively ideal result was achieved in the Matlab software simulatio n.Finally,“boiler load follow header pressure” control was selected,after ensuring the normal operation of current equipment.The pressure regulating boiler online identification,dynamic load distribution methods were designed and applied in the control of boilers with main steam header.The boiler load distributions were more reasonable,the load and pressure cooperation among boilers was achieved.