Research And Numerical Simulation On Staged Combustion To Reduce NOx Exhaust Of 400t/h Tangential Firing Boiler

Development of coal combustion technology in the past was largely empirical in nature, being based primarily on years of accumulated experience in operations of utility furnaces and on data obtained from sub-scale test facilities. Empirically based experience and data have limited applicability. With the fast development of computer, the numerical simulation of combustion has been an important means of the combustion theory research and the combustion device design.By using the CFD software, the TianShenggang SG-400/140-M410 boiler has been simulated. The boiler is tangential firing pulverized coal boiler. I studied the flow, convection and combustion in the boiler and gave the velocity distribution, temperature distribution and so on. In the paper, the swirl number distribution and the NOx distribution in the boiler also are studied. Based on this, the boiler will be rebuilded. According to the way of combustion, I would add a flat of burn-out wind and change air's match to decreasing the NOx. So four projects are designed. The results show that all the four projects could decrease the let of NOx in the vary degree and prove that the classified combustion adding burn-out wind has effect on low NOx. And the classified intensity is more and the amount of NOx is lower.