SU74209A1 - The method of injection into the blast furnace blast furnace blast furnace gas blast furnace - Google Patents

Description

Currently existing methods for blowing blast furnace dust into a blast furnace have a number of significant drawbacks.

The blowing of flue dust by air into the pizhpyu part of the blast furnace blast according to the method developed by Lengipromez requires a compressor unit. Dusting by this method limits the horizons of the places where dust is introduced into the mine from the nechi, since this is due to the need for high temperatures at the places where dust is introduced to ensure ignition of the gas and air mixture that is formed.

The injection of top dust by this method into the upper horizons of the mine, where relatively low temperatures prevail and have little heated materials, is associated with the danger of the formation of an explosive mixture and explosion.

According to the invention, it is proposed to blow the flue dust into the upper horizons of a blast furnace with gases from the lower horizons of the same furnace by the following method.

Koloshnikov dust from a bunker located in the region of the blast furnace top is piped to the points of entry into the furnace. Dust is introduced into the furnace by a nozzle.

To force the dust to enter the oven and spray it into it. The sunke inlet t blast gas from the lower horizons of the furnace. The supply of gas from the lower horizons to the upper horizons is based on the use of a gas pressure differential for the process of blowing dust. A series of studies of the operation of the shaft of the blast furnace showed that the gas pressure in the furnace at the level of 4 m below the large cone (under the protective rings) does not exceed 1200–1800 mm of water. Art. The pressure of the gas in the lower part and the vapor not less than 4000- -5000 mm of water. Art.

Thus, the gas supplied from the lower horizon to the upper bed for blowing in the flue dust to the upper bed will have an excess pressure of at least 2500 mm of water column. Such an overpressure would be quite sufficient for entering the top furnace into the furnace and spraying it in the furnace.

Dust injection is most efficiently carried out by tangential and oblique supply. This will allow with a minimum number of holes around the circumference to spray more fully and evenly

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No. 74209 -2 flue dust according to the internal aspect of the invention.

The deep-bedded dust blowing into the shaft of the upper horizon of the furnace has a pre-flue furnace dust is a matter of fact that the introduced gas, which is different in that the dust will be subjected to gradual dusting by furnace gases throughout the upper part of the shaft, using the sludge powder, therefore, any co-differential pressure between this number is introduced. The introduced dust is not a non-part and the normal process flow below is located in the part from which the lower horizons of the furnace are sampled. Gas.