| High temperature air combustion (HTAC) is a new energy saving and environmental protection technology, and the regenerative burner is the most key part of HTAC. Centering on the structure optimization of burner, numerical simulation and experimental study has been carried out. The results are as follows:The combustion process of blast furnace gas regenerative burner is simulated with the FLUENT software, and the calculation model consists of k-εtwo-equation model for turbulent flow, discrete transfer model for radiation process, Eddy-Dissipation model for gas combustion and Zeldovich model for NOX formation. The comparison of two different chemical reaction mechanisms is completed, and the results indicate that water-vapor reaction mechanism is more suitable for the blast furnace gas regenerative combustion than global reaction mechanism proposed by Lavrov.The comparative study on the influences of nozzle structural parameters has been carried out by means of numerical simulation, and the results indicate that: (1) The change of the distance between air nozzle and gas nozzle in 15D-20D and the angle of nozzle in 3°-9°has little influence on temperature, and the high temperature zone mainly concentrates in the middle of the furnace, the temperature field is uniform, the temperature difference is less than 100℃. (2) The matching of nozzle distance and nozzle angle is important, and the inappropriate design will cause incomplete combustion. At the same time, 18D and 5°is the optimal combination. (3) NOX simulation results show that the structure of experimental burner is efficient to reduce NOX generation, and using the low calorific value blast furnace gas is same.The experimental study on regenerative burner is finished, and the results indicate that all of the combustion performance parameters have the unsteady and cyclical process characteristics and the simulation results are consistent with the experimental data. |
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