Development of Swirl Burner Series for Steel Making Processes

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1 3 3.4.4 Burner application results SCF burners were installed in the ignition furnace for the No. 2 sintering machine at the Kashima Steel Works in March, 1985, the No.3 sintering machine at Kashima in March, 1986, and the No. 5 sintering machine at the Wakayama Steel Works in November, 1986. These all have shown excellent operation since then, reducing the unit cost of coke oven gas. Two sets of SSC burners were installed on the palette wall side of an ignition furnace. re­inforcing ignition at the side wall. To prevent the adhesion of raw materials, the quarl was made of the heat resistant metal. (1) Furnace width-directional temperature distribution has improved, becoming uniform in terms of raw material surface temperature distribution after ignition. (Table 7) Table 7 Improved flammability of new type ignition furnace No.3 sintering machine at the Kashima Steel Works Production ratio hIm' ·24 h) Thickness of layer (mm) Coke oven gas (x 10) kcal/tl Strength of ignition (kcal/m') Distance between burner (mm) and grate surface Before reformation 21.3 405 10.0 4810 '400 x = 164°C ! 250f- •• 38'C I Temperature of rcrw material surface i C) (Measuring at the exit· side of heat maintenance furnace) Width of pallet: 5 meters 200 - ° Y.0 --., 0 150f-(0 ° t 100 0 I I I 2.0 1.0 0 '.0 2 .0 Measured on April 7,1984 o o After reformation 22.8 430 6.8 . 3430 750 ;'---0 h~ I o o I o I I I I I I i=240°C (1 = , ,oC 2.0 1.0 ' .0 1.0 2.0 Measured on June 5 , '985 (2) As to the raw material surface temperature within the ignition furnace, a maximum temperature equal to that of the conventional burner was obtained with the SCF burner when the volume of coke oven gas was reduced to half. (Fig. 23) (3) The No. 2 and No. 3 sintering ignition furnaces at the Kashima Steel Works provide a unit consumption of 1.2-1.4Nm 3/t coke oven gas in case of a 400mm thick layer. reduced by O.86Nm3/t-s compared with that of the conventional burner. (Fig. 24) (4) More than five years have passed since the start of operations, but there has been no thermal deformation and damage in the burner without causing any choking trouble, which is excellent in durability and easy in maintenance. (5) Since there is no choke trouble with the burner part, high efficiency operation of low furnace is possible, operating in a O.25-0.35m distance range between the burner and raw material surface.