The Experimental Study And Numerical Simulation On Staged Combustion To Reduce NO_X Exhaust Of 410t/h Tangential Fired Boiler

Reducing the let of NOX from power plant is an urgent task in recent years.Based on the air-staged proportion of combustion theory, the TianShenggang SG-400/140-M410 boiler has been rebuild to decrease the let of NOX. In this paper , the flow field of the boiler is studied through experiment and numerical simulation to assure that the rebuilding does not cause bad aftereffect. The experiment and computation also provide theoretical guide for heat-state low NOX burner experiment.According to similarity modeling theory, a cold-state simulation experimental equipment of 410t/h tangential fired pulverized coal boiler is set up. Particle Image Velocimetry has been used to test fluid field of the boiler in three operating conditions.By using FLUENT software, the tangential fired pulverized coal boiler has been simulated. The simulation results of velocity distribution tally with the results of flow field of the experiment. The degree of admission in furnace, swirl angular momentum, circle diameter etc. have also been studied to evaluate the operating condition.The study of the paper shows that the adding of OFA will affect the flow field of the boiler, but some combustion method, for example: increasing the velocity of the secondary air, reversing the secongdary air of the top part of the furnace, can improve the operating condition of the OFA combustion method.