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Heat regenerator occupied by regenerative materials improves thermal efficiency of regenerative<br/> combustion system through the recovery of sensible heat of exhaust gases. By using one-dimensional twophase<br/> fluid dynamics model, the unsteady thermal flow of heat regenerator with spherical particles, were<br/> numerically simulated to evaluate the heat transfer and pressure drop and to suggest the parameter for<br/> designing heat regenerator. It takes about 7 hours for the steady state of the flow field in regenerator, which<br/> heat absorption of regenerative particle is concurrent with the magnitude of heat desorption. The regenerative<br/> particle experiences small temperature fluctuation below 10K during the reversing process. The thermal flow<br/> in heat regenerator varies with inlet velocity of exhaust gas and air, configuration of regenerator(crosssectional<br/> area and length) and diameter of regenerative particle. As the gas velocity increases, the heat transfer<br/> between gas and particle enhances and pressure losses also increase. As particle diameter decreases, the air is<br/> preheated higher and the exhaust gases are cooled lower with the increase of pressure losses.
Low calorific combined gases, such as BFG, CFG, COG, and LDG, are generated at ironmaking and steelmaking processes. The BFG(Blast Furnace Gas), having lowest heating value among these combined gases, is not basically burned with mixing of only air as oxidant. Meanwhile, using oxygen as oxidant, the BFG could be burned. The purpose of this work is to develop an oxyfuel burner of low calorific BFG and to apply the burner to a large scale furnace at Pohang steel works. The basic burner model for stable BFG-O2 flame is proposed and optimized: oxygen is discharged through a nozzle in the center of the burner and BFG is supplied with its concentric tube. The nozzle rim of oxygen plays a important role to stabilize and hold the flame. A real scale burner for real scale furnace at chemical process plant is developed through scale up from the small scale model. The developed burner is attached in real scale furnace and field tests are carried out. From the tests, it is confirmed that the developed burner system is successfully operated in the furnace and the effect is positive in the side of low NOx emission under l0ppm and energy saving by 37% in heating value basis
An experimental study was carried out in a real scale test furnace to investigate the performance, such as NOx emission, enhancement of heat transfer, uniformity of temperature, and etc, of oscillating combustion applied in radiant tube burner system. A oscillating controller with solenoid valve were designed and used. Two burners used in steel industry were tested in this study. The fuel, used commercial LPG in this study, was only oscillated using the oscillating controller with a solenoid valve. As oscillating combustion was applied in radiant tube burner system, it is found that NOx emission, compared to no oscillation, could be reduced by 20~30% at 2.5㎐ without CO emission. However, as oscillating frequency was increased, effect of abatement of NOx emission is gradually reduced. From the measurement of furnace heating time from 100℃ to 900℃, heat transfer is increased by 4.0% at the oscillation of 2㎐. Temperature distribution of radiant tube surface is more uniform at oscillation of 2Hz with decrease of the peak temperature and increase of low temperature. From these results, it is confirmed that oscillating combustion is useful in radiant tube burner system.