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



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.




Download Full PDF Version (Non-Commercial Use)

Patent Citations (0)

    Publication numberPublication dateAssigneeTitle

NO-Patent Citations (0)


Cited By (14)

    Publication numberPublication dateAssigneeTitle
    CN-103267303-AAugust 28, 2013大唐林州热电有限责任公司NOx generation reducing method for four-corner tangential boiler of thermal power plant
    CN-103267303-BMay 04, 2016大唐林州热电有限责任公司一种火电厂四角切圆锅炉降低NOx生成的方法
    CN-103822225-AMay 28, 2014深圳市国创新能源研究院集成低氮燃烧系统及控制方法
    CN-103822225-BApril 27, 2016深圳市国创新能源研究院集成低氮燃烧系统及控制方法
    CN-104061588-ASeptember 24, 2014烟台龙源电力技术股份有限公司Low-nitrogen combustion control method and system based on secondary air door air regulation control
    CN-104676638-AJune 03, 2015冉启发, 谢京涛Method of controlling low-nitrogen combustion damper in load-down process of boiler
    CN-104676638-BJuly 04, 2017冉启发, 谢京涛一种锅炉降负荷过程中的低氮燃烧风门控制方法
    CN-104692129-AJune 10, 2015吴联凯Control method for pneumatic conveyor
    CN-104692129-BNovember 25, 2015吴联凯气力输送装置的控制方法
    CN-104692130-AJune 10, 2015吴联凯Control system of pneumatic conveyor spindle
    CN-104692130-BNovember 25, 2015吴联凯气力输送装置主轴的控制系统
    CN-104743364-BDecember 30, 2015吴联凯气力输送装置的电控系统
    CN-104803198-BDecember 09, 2015吴联凯气力输送装置
    CN-105509035-AApril 20, 2016华北电力科学研究院有限责任公司, 国家电网公司Method and device for determining opposite firing air supply quantity and automatic control system