Combustion Simulation and Structure Improvement of Internal Combustion Hot Blast Stove

The main function of a hot blast stove is to deliver a high-temperature and stable hot blast to the blast furnace, which has an important impact on the blast furnace ironmaking process. To improve the combustion efficiency, a simulation model of the combustion part of an internal combustion hot blast stove was established by combining turbulence, combustion, and radiation models. Based on the original model, a new type of internal combustion hot blast stove is proposed. The results indicated insufficient combustion in the original structure and higher CO concentrations in the corners of the eyes at both ends of the combustor outlet, the recirculation area at the bottom of the combustion chamber was mainly concentrated in the middle part. With the new structure of the hot blast stove, the gas baffles with different inclination angles are added to the rectangular burner, at the outlet of the combustion chamber, the CO concentration is reduced to a certain extent, and the temperature distribution is more uniform. When the inclination angle of the gas baffle is 60°, the combustion chamber outlet section average temperature rises from 1686 K to 1693 K, the outlet flue gas average volume fraction of CO decreases the most, and the average volume fraction of CO decreases from 0.00708% to 0.00568%, which could reduce the CO content by about 20%.