680 T/h Boiler Low Nox Combustion Technology Analysis

In China, as environmental laws and regulations and the relevant provisions have been improved steadily, the nitrogen oxide emissions has aroused extensive attentions of community and enterprises. The fuel of thermal power plants is mainly coal, which results in a larger emissions of pollutants in thermal power plants. In recent years, by investing in desulfurization system in thermal power plants, the sulfur dioxide emissions have been brought under control, we have got some good results. Thus, acid rain gradually transforms into sulfuric acid and nitric acid type compound, indicating that the control about nitrogen oxide emissions is weakness. In 2012, the State Environmental Protection Department has formally promulgated a new "thermal power plant air pollutant emission standards"(GB13223-2011), the emissions of soot, SO2 and NOX are raised new demands, which requires emission targets of air pollutant in the existing thermal power plants must been met the SO2 concentration is less than 200 milligrams per cubic meter, NOX concentration is less than 200 milligrams per cubic meter, and the dust concentration is less than 30 milligrams per cubic meter from July 1, 2014.It has proposed that the total nitrogen oxide emissions reduce by 10% of the hard targets for the thermal power plants in “National Environmental Protection ‘second five’ plan", further strengthen the efforts to control emissions of nitrogen oxides. With the rapid development of power industry in recent years, the consumption of coal increased significantly and Nitrogen oxide emissions also increased in Guangdong province. Therefore, it is necessary to strengthen the control and reduce emissions of nitrogen oxide emissions, the corresponding depth study about controlling method and the impact of nitrogen oxides must be carried out.In this paper, it is the problem of nitrogen oxides emissions for 680 t/h coal-fired boilers, which makes in Harbin Boiler Factory, the generation principles of nitrogen oxides form the furnace were analyzed, combing with relevant literature, the method of reducing the concentration of nitrogen oxides in the furnace exit was proposed. Through the practical application research of low NOX combustion transformation for Harbin Boiler 680 t/h boiler, two-scale low-nitrogen burners were presented, which could indeed effectively reduce the NOX emission concentration from furnace exit under the premise of without affecting the the safe and economic operation, and it had been verified through the boiler performance test. The results showed that low NOX combustion transformation can effectively reduce the concentration of nitrogen oxides from furnace exit, and they have a positive impact on operation control and cost control as well as the environmental goals for the concentration of nitrogen oxide emissions of less than 200 mg/m3, flue gas denitrification efficiency greater than 80% on the subsequent SCR denitration system. In this paper, the program selection, equipment selection, project implementation and performance analysis in the reconstruction project, which provides a reference for the same type units of low NOX combustion transformation.