Fluidized Bed Reduction Apparatus of Pulverized Iron Ore under High Pressure
1984 年 24 巻 2 号 p. 156-162
詳細
1984 年 24 巻 2 号 p. 156-162
An experimental apparatus with a batch type Fluidized bed reactor of 60mm ID for iron ore reduction was developed. The maximum reduction temperature and H2 pressure were 900°C and 40kgf/cm2, respectively. Experiments revealed that there were many operational problems to be solved and successive improvements were made. Findings obtained during the development of the apparatus are as follows:
(1)In order to keep the gas flow and pressure constant at the reduction, the performance of inlet pressure regulators was the most important and it was better to install two independent regulators for high and low pressure ranges.
(2)In order to decrease the pressure change brought about by switching the gas flow from N2 to H2 at the start of the reduction, it was effective to install two independent outlet pressure regulators for N2 and H2.
(3) When pressurized Ar was introduced to the space in the electric furnace of external heating type to get the pressure balance with the reactor, heating efficiency of the furnace was found to decrease seriously because of enhanced heat leakage.
(4) Sufficient gas preheating was very effective for fine control of the reduction temperature in the fluidized bed and also for prevention of the sintering trouble of the reduced iron powder at higher reduction temperature.
