鉄鉱石の小型高圧流動還元実験装置

概要

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An experimental apparatus with a batch type fluidized bed reactor of 60mm I.D. for iron ore reduction was developed. The maximum reduction temperature and H_2 pressure were 900℃ and 40kg/cm^2. 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 by swiching the gas flow from N_2 to H_2 at the start of the reduction, it was effective to install two independent outlet pressure regulators for N_2 and H_2. (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.
社団法人日本鉄鋼協会の論文
1981-08-01