Research On Selection Of Low Nitrogen Burner And Optimization Of Combustion Adjustment For 1000MW Ultra Supercritical Tower Type Boiler

The construction of ecological civilization is a millennium plan for the sustainable development of the Chinese nation.Beautiful scenery is yinshan concept has been firmly established.State and local governments and industries have put forward standards and requirements for controlling NO_X emissions.As the largest thermal power plant in China Southern Power Grid,Guangdong Taishan power plant has the responsibility to respond to the call of the state to achieve ultra-low NO_X emissions.This paper analyzes the mechanism and application of new low nitrogen combustion technology and studies the causes and solutions of the high temperature corrosion and boiler coking occurring after the transformation of low nitrogen burner in domestic thermal power plants.According to the structure characteristics of the 1000MW super supercritical Tower Boiler in Taishan power plant,and referring to the problems of other power plants,the advanced composite air combustion technology in Shanghai boiler plant is adopted to transform the low nitrogen burner,and the feasibility of the scheme is verified by numerical simulation.The cold dynamic field test of a retrofit boiler is carried out.It is confirmed that the diameter of the tangential circle is reasonable and no scour wall is available.The influence of structural parameters of low nitrogen burner on reducing NO_X and safe and economical operation is obtained through hot combustion adjustment test.Combined with the adjustment of the operation mode of the pulverizing system,the curve of oxygen volume and air door opening under the best working condit ion is obtained.After the transformation of the low nitrogen burner,the NO_X emission of the1000MW ultra supercritical Tower Boiler of the Taishan power plant is 177.27mg/Nm~3,which is reduced by 32%~57%compared with the 250~400mg/Nm~3NO_X emission values before the transformation.The boiler runs stably,no high temperature corrosion and boiler coking occurs,and the boiler efficiency is no drop.It achieves safe,economic and environmental protection operation.