Gas Utilization Ratio Research Articles

Characteristics of a new gas‐induced reactor

AbstractA newly developed gas‐induced reactor for gas‐liquid heterogeneous reactions presented here has no baffle on the inner wall of the tank body. Inside the reactor tank, two in‐series 45° pitched blade downward turbines enclosed by a draft tube were employed. As the turbines rotate at high speeds, a central gas vortex is formed downwardly along the central shaft from the free surface of the liquid toward the upper turbine. The gas is then induced by the upper turbine and mixes with the input gas. After that, the mixed gas is broken into bubbles by the lower turbine and dispersed through the liquid vortex. With the formation of gas and liquid vortexes, the reactive gas was able to circulate in the liquid phase to achieve high gas utilization. The experimental studies were on the heterogeneous ozonation reaction of a reactive dye (C.I. Reactive Blue 19). Major experimental parameters, such as impeller speed, input concentration of ozone, input flow rate of ozone and liquid volume, were changed to investigate the characteristics of the gas‐induced reactor. This gas‐induced reactor achieved high gas utilization ratio, short reaction time, and high recovery of the unreactive gas.

Lower Fuel Rate Operation by a Large Blast Furnace Equipped with Bell-less Top

In June, 1977, No. 6 Blast Furnace at Chiba Works of Kawasaki Steel Corporation, was blown in as the largest bell-less top equipped furnace in Japan. Although troubles, such as tuyere bending and burning-out attributable to inappropriate gas flow distribution, were encountered at the initial stage, the results of a series of operational experiments were conducive to improving the in furnace conditions. Especially, the tests designed to determine the optimum charging sequence for coke and ore produced the following achievements:1) The CO gas utilization ratio (out of the top gas) improved to about 54%.2) No tuyere burn-outs since April, 1979.3) A considerable decrease in the thermal load on the furnace shell.Furthermore, very low fuel rates followed these improvements: a monthly average of 418.4kg/mt-h•m in March, 1980; and a yearly average of 436.1kg/mt-hm•m for the one year period from April, 1979 to March, 1980.

ガス利用率の変化について

ガス利用率の変化について