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%.

To investigate the flow and heat transfer process of blast furnace slag through the slag trench after the slag is discharged, a three-dimensional physical model is established and simulated according to the actual size of the slag trench and the physical properties of the high-temperature slag. The temperature field and flow field distribution of the high-temperature slag liquid inside the slag trench is obtained by numerical simulation under different working conditions, and the effects of operating conditions such as slag trench inclination, high-temperature slag inlet flow rate, and inlet temperature are investigated. The results show that the flow rate of high-temperature slag is related to the slope of the slag trench, the greater the slope of the slag trench, the higher the flow rate of high-temperature slag, in which the highest average speed can reach 2.23 m/s when the slope is 8%; changing the inlet flow rate, flowing through the slag trench, the high-temperature slag reaches the highest flow rate at the same position, the overall flow rate changes tend to rise first and then decrease, and the greater the inlet flow rate, the higher the temperature change of high-temperature slag. The higher the inlet flow rate, the higher the temperature change of high-temperature slag, the higher the temperature of high-temperature slag out of the slag trench; the higher the inlet temperature, the higher the overall flow rate of high-temperature slag, and the position of the highest flow rate is relatively backward.

In order to study the effect of oxygen-enriched combustion technology on the temperature field and NO_X emission in the continuous heating furnace, this paper studies the oxygen-enriched combustion of a pushing steel continuous heating furnace in a domestic company. This study utilizes numerical simulation method, establishes the mathematical models of flow, combustion and NO_X generation combustion process in the furnace and analyzes the heat transfer process and NO_X generation in the furnace under different air oxygen content and different wind ratio. The research results show that with the increase of oxygen content in the air, the combustion temperature in the furnace rises significantly, and the emission concentration of NO_X increases. Furthermore, the NO_X emission concentration is related to the proportion of primary and secondary air.