Numerical Simulation Of Combustion Of Zhundong Coal And Prediction Of NO_x

In this paper,a typical 350 MW four angle tangential coal-fired power plant boiler is used as a model.According to the basic requirements of the ideal combustion conditions,pulverized coal characteristics and operating parameters control of the boiler,a series of optimization solutions are derived through three dimensional modeling,numerical simulation and data verification.The paper also carries out numerical and quantitative analysis on the diffusion combustion law of pulverized coal air in the furnace and the weight of related factors affecting the NOx emission index.The research results of this paper can provide important reference for the relevant theoretical research and field operation.The four corner tangential air distribution boiler in this paper is simulated and verified by the orthogonal conditions composed of two typical commodity coal(Tianchi energy company and Shenhua Xinjiang company)and its common mixing ratio.The main measures to reduce NOx emissions from furnace combustion are as follows: 1)layered mixed combustion helps to reduce the emission of nitrogen oxides in the boiler;2)the two kinds of coal combustion is suitable for the lower volatile content of Tianchi energy coal,which can reduce the NOx emissions more effectively;3)Tianchi Coal and Shenhua coal combustion,Shenhua coal The larger the mixing ratio,the higher the NOx concentration at the outlet of the furnace.Through the three-dimensional modeling and numerical simulation,the air staged combustion system of 350 MW boiler is optimized and reconstructed.The SOFA separation and burnout wind is added to the boiler with no burning wind in the industry.By comparing the NOx emission after combustion and the distribution law of nitrogen oxide concentration along the furnace height in the furnace,the favorable configuration and orientation of SOFA are analyzed.The simulation and experimental data show that 1)adding the wind energy to reduce the average temperature in the furnace and reducing the high temperature area in the furnace;2)adding the burning wind energy to reduce the emission of NOx well;3)the improvement effect of the burning wind and the distance between the main combustion area and the main combustion zone in the 6m is better.In this paper,the theory of "theory + contrast + positivism" is applied to introduce the new concept of oxygen enriched combustion industry based on RFG,and optimize the operation control of 350 MW Jundong coal boiler.First,the influence rate of oxygen rich combustion on NOx is simulated,and the indexes of four angle tangentially fired boiler,such as 21% RFG,25% RFG and 29% RFG,are analyzed,and the NOx concentration in the flue gas cycle is considered.The following conclusions and conclusions are drawn: 1)RFG oxygen enriched combustion can reduce NOx formation.2)CO2 oxygen enriched combustion can significantly reduce NOx generation 3)Cyclic NO also significantly reduced NOx emissions.