Ruifeng Dou

Numerical simulation and parameters optimization on gas–solid heat transfer process of high temperature sinter

Abstract Based on the careful analysis of the heat transfer mechanism of the cooling process of high temperature sinter, a one-dimensional unsteady state mathematical model for the gas–solid heat transfer process of high temperature sinter was established according to the energy conservation. The mathematical model was verified by the use of industrial practical data, and the results showed that it was correct and reliable. Lastly, the model was used to investigate the effect of operation parameters (such as the trolley moving speed and the cooling air velocity) on the cooling process of the annular cooler, and the proposals were put forward for optimising operations of the annular cooler.

The effects of operational parameters on flue gas recirculation iron ore sintering process: sensitivity analysis based on numerical simulation and industrial onsite experimental validation

ABSTRACT A one-dimensional mathematical model is adopted to analyse influences of operational parameters on process performance during flue gas recirculation sintering (FGRS). Simulation results show that FGRS can enhance combustion characteristics and improve distribution of heat. Subsequently, the sensitivity coefficient is used to study contribution of operational parameters to quality and productivity of sintered ore. Sensitivity analysis shows the order of sensitivity of productivity is O2 content > gas supply > temperature, while that of quality is O2 content > temperature > gas supply. The optimal regulation strategy is that O2 content should be controlled first before temperature and that gas supply should be closely controlled. The optimum O2 content range is 19–20 vol.-% and the optimum temperature is around 200°C. Gas supply of FGRS should increase by 4.17%. Finally, an industrial test was carried out, which indicated that the optimal regulation strategy is reasonable.

Strategy research on force setting of strip-switching process in continuous annealing furnace

This paper analysis the force between strip and roll in continuous annealing furnace at first, and make the research on the force setting of the strip-switching process after. Through the study, it indicates that the force setting is not that easily changing one force value to another. This adjustment is limited by both sides of the strip tension to avoid the slipping between the strip and roll. To solve this problem, the switching strategy which limits the difference between two adjacent setting forces is proposed.