PURPOSE: To prevent drop in the temp. of molten iron when a blast furnace is operated on a reduced scale, by not charging burden from the beginning of the operation to the end.
CONSTITUTION: When a blast furnace is operated on a reduced scale, no burden is charged from the beginning of the operation to the end. The fuel ratio of a burden reaching a tuyere in the stage is kept at a conventional level, and fuel is used by the minimum amount required to maintain the temp. of molten iron. The volume of top gas is reduced, and the temp. of the gas is controlled to a low level. When water is sprinkled over the top of the furnace, the temp. of the top can be controlled by regulating the flow rate of water to be sprinkled and the diameter of water droplets in accordance with the stock line level at the beginning of operation on a reduced scale.
UNO SHIGENORI
MATSUOKA HIROSHIGE
SAKAMOTO AIICHIROU
JPS58104104A | 1983-06-21 |