Large Blast Furnace Research Articles

Refractory Practice in Large Size Blast Furnaces in England and Europe

Refractory Practice in Large Size Blast Furnaces in England and Europe

Operation of Blast Furnace without Liquid Fuel

Three large blast furnaces of NKK have been shifted to the operation without liquid fuel one after another since January, 1980, and the oil-less operation of all blast furnaces was finally achieved in April, 1980. Fukuyama No. 3 Blast Furnace (3223m3), has been operated with increased blast volume and higher blast temperature in order to solve operational problems and achieve improved operation. Although increased slips and fluctuations in blast pressure have been often observed in the operations when the flame temperature is high, all furnaces have been in smooth operation owing to the proper gas distribution control and furnace heat control. By the calculations based on operational results, a productivity of as high as 2.3t/m3/d can be expected on a monthly averaged value in all-coke operation.

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.

ベルレス式大型高炉による低燃料比操業

ベルレス式大型高炉による低燃料比操業

Construction and Operation of Large Blast Furnaces at Fukuyama Works, N.K.K.

Construction and Operation of Large Blast Furnaces at Fukuyama Works, N.K.K.

Radial distribution of the gas flow in large blast furnaces

Radial distribution of the gas flow in large blast furnaces

New automation means and system for large blast furnaces

New automation means and system for large blast furnaces

Production of Formed Coke and Trials in Blast Furnace

The production of a formed coke in excellent quality has been realized in use of a non-coking coal as the main raw materials.As the result of the experimental use of this formed coke for the No.2 blast furnace in Kokura Steel Works of Sumitomo Metal Industries, Ltd. it has been proved that it is not inferior to the conventional coke for same.We intend to study for enlarging coke oven and to make efforts to materialize the economic rationalization of a formed coke for a large blast furnace.

Operating large blast furnaces on natural gas

Operating large blast furnaces on natural gas

Repair of large blast furnace bells

Repair of large blast furnace bells

The operation of ?floating? coolers in the stack of a large blast furnace

The operation of ?floating? coolers in the stack of a large blast furnace

Installing air heaters in a large blast furnace

Installing air heaters in a large blast furnace

The operation of large capacity blast furnaces

The operation of large capacity blast furnaces

On disruption in the operation of crucibles in large blast furnaces

On disruption in the operation of crucibles in large blast furnaces

Experimental operation of a large volume blast furnace

Experimental operation of a large volume blast furnace

A Conference on the Plans of Large Blast Furnaces

A Conference on the Plans of Large Blast Furnaces

Charging of a large blast furnace with size-graded charge

Charging of a large blast furnace with size-graded charge