Research On Low Nitrogen Burner Transformationand Optimizing Operation Of 600MW Subcritical Units

Because of the rich of the coal in our country’s energy resource,the coal-fired power plant has become the main component of China’s electric power industry.Although the chemical energy of coal can be converted into efficient energy,the combustion of coal produces some pollutants,of which NOx is one of the major pollutants.NOx will not only form acid rain,but also destroy the ozone lay er.So the reduction of nitrogen oxide emissions has become the mai n task of thermal power plants.In this paper,to be directed against the high value of NOx emission,the transformation measure was carried out about 600 MW Subcritical Units of ninghai power.First of all,the unit burner structure,coal characteristics and so on are analyed.Then,the preliminary scheme of double-scale combustion technology is put forward,and the reconstruction scheme is predicted by thermodynamic calculation and numerical simulation.After the good effect is obtained,the boiler combustion system is reformed and optimized.Finally,the stability of the combustion is poor and so on.The relevant data are analyzed and found to be due to the deep air classification and the primary air pitch.According to the analysis results,in the subsequent transformation of the No.4 unit,modified the transformation program,and the INFIT real-time optimization control system was adopted.The experimental results show that the NOx reduction effect is remarkable after the double-scale combustion technology is used in this unit,and the efficiency of the boiler is reached by the technical agreement.The INFIT real-time optimization control system is used to optimize the steam and steam temperature.