Low-nitrogen Combustion Reformation Of Boiler Burner

As a main source of power supply in China,coal-fired power plants have also brought serious air pollution problems.With the concept of the Five Integral and the concept of ecological civilization proposed by the 18th National Congress,limiting the emission of nitrogen oxides from coal-fired power plants has become the primary goal of major power plants.At present,China's major coal-fired power plants have adopted the most degradable flue gas denitration technology in order to achieve the emission of nitrogen oxides.However,due to the high cost of reducing flue gas denitration technology,the low nitrogen reform of the burner has become a measure to reduce costs in large coal-fired power plants.In this paper,based on the comprehensive study of the low-nitrogen burners of various coal-fired power plants and relying on the current combustion system,in order to maintain the high combustion efficiency of the boiler,the slagging and nitrogen oxides are prevented from being greatly reduced.Nitrogen modification measures:low NOx reforming measures for burners;anti-slagging,anti-corrosion measures and high-efficiency measures.The scope of the renovation mainly includes the main burner section and the burnout section.The transformation results show that the modified burner has better furnace air weight ratio,which can meet the national requirements for nitrogen oxide emission while ensuring stable combustion of coal powder.Through the cold state experiment and the hot state experiment of the modified burner,and compared with the burners of other coal-fired power plants,the process parameters of the modified burner in actual operation are obtained.After running the modified burner,the nitrogen oxides of the original flue gas decreased from 600mg/m~3 to 220mg/m~3 under pure coal conditions;the nitrogen oxides of the original flue gas decreased from 400mg/m~3 under the gas blending condition.To 170 mg/m~3.Compared with before and after the transformation,the boiler efficiency is slightly improved.Under the condition of gas blending,the boiler efficiency is increased by 91.49%from 91.49%.Under pure coal conditions,the boiler efficiency is increased from 92.92%to 93.79%.Meet the national environmental protection standards of 2016,net smoke emission of nitrogen oxides50mg/m~3;the daily average liquid ammonia consumption of the burner unit after renovation is reduced by 1.5t,the annual cost of saving liquid ammonia consumption is 17.82 million yuan;It can save liquid ammonia 1.5t and 0.72t steam volume of0.7MPa every day,and save steam economy by 30,000 yuan per year.After the change,the burner can reduce the emission of nitrogen oxides,but it can not affect the working efficiency,and also control the cost of denitration.Figure 26;Table 14;Reference 52...