Power boiler low NOx combustion method and control system based on wind powder closed-loop control

基于风粉闭环控制的电站锅炉低NOx燃烧方法及控制系统

Abstract

本发明公开了一种基于风粉闭环控制的电站锅炉低NOx燃烧方法及锅炉一次风风粉闭环控制系统,其方法为:将主燃烧器区域过量空气系数控制在1.0以下,在炉膛上部不足的空气由AA区间SOFA喷口处补充,使用煤种N-负荷D-分级风风量Q函数f(Q)=f(N,D),将NOx实测值与目标值比较,其偏差通过PID调节后作为修正因子叠加到煤种-负荷-分级风风量函数f(Q)上来调节燃烧区域二次风量与SOFA风量配比。所述系统包括一次信号测量、信号采集、数据处理与反馈执行4个部分。本发明通过闭环控制系统确保锅炉在不同工况下各层一次风风粉分配均匀和燃烧区域二次风量与SOFA风量配比最佳实现了以减低锅炉污染物NOx排放和提高锅炉效率的优化控制目标。
The present invention discloses a power station boiler low NOx combustion method based on wind powder closed loop control and a boiler primary air wind powder closed loop control system. The method is as follows: the main burner region excessive air coefficient is controlled below 1.0; the deficient air at the upper side of a hearth is supplemented by an SOFA nozzle at AA interval; a function f(Q)=f(N,D) is used to compare NOx actual measured value with target value, wherein N is coal type, D is load and Q is graded air amount; after adjusted by PID, the deviation of the comparison is used as a correcting factor to be overlapped with the coal type-load-graded air amount function f(Q) for adjusting the mixture ratio between the SOFA air amount and the secondary air amount of the combustion region. The system comprises a first signal measuring part, a signal acquiring part, a data processing part and a feedback part. With the closed loop control system, the method ensures, in different working conditions, the even distribution of the first air wind powder of each layer and perfect mixture ratio between the SOFA air amount and the secondary air amount of the combustion region, so that the method realizes the optimized control target of reducing the discharging of boiler contamination NOx and improving boiler efficiency.

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