SU118359A1 - Pit furnace for sintering materials in a suspended layer - Google Patents

Description

The subject of the invention is a shaft kiln for firing sintering materials in a suspended (fluidized bed) layer divided by horizontal gratings into chambers. The known shaft kilns with horizontal grids for firing materials in a fluidized bed do not provide a stable firing mode.

In the shaft furnace described, this disadvantage is eliminated by the fact that the furnace shaft has a material sintering chamber expanded at the base and narrowed in its upper part. This increases the velocity of the heated air coming from below. F creates a suspended (boiling) layer of material in which the fuel burns and the material burns, and a dense layer of enclosed material forms in the lower part of the chamber, which acts as a gas distributor.

The drawing shows a shaft furnace for firing sintered materials, a general view.

The mine has a plate granule torus 1, a feeder 2 and a pipe 3, through which the granulated raw material mixture is fed to the upper part of the shaft 4. The mine is divided by horizontal bars 5, 6.7 and rollers 8 into four chambers 9, 10, 11, / 2 The pipes (5, 14, 15) communicate with each other, with the pipe 13 protruding above the grate 5 to a certain height, which determines the height of the suspended layer of material in the chamber and almost reaches the grate 6. When in the chamber 9 the material layer rises above the protruding part of the pipe 13, the material will pass through the pipe 13 into the chamber 10. And through the pipe 14, the material flows from chamber 10 into chamber // and through pipe 15 from chamber 11 into chamber 12. The lower part of chamber 12 is expanded with respect to its upper part in order to create a dense layer of burned clinker in this part of the chamber. Through this layer is injected the need # 118359-2 -

combustible air that is heated by the heat of the clinker.

Thus, clinker is cooled in this layer. Above the dense layer, due to an increase in the velocity of the heated air coming from below due to a decrease in the cross section of the chamber and an increase in the temperature of the gases, a suspended layer is created in which the fuel is burned and the material is burned. Fuel is supplied through a series of nozzles 16 located at the interface between dense and weighted layers.

The products of combustion from chamber 12 are successively passed through the grids 7, 5, 5 and are located; they are located on them. Layers of material with the speed necessary to create a suspended layer in chambers 9, 10, 11, in which the material is heated and decarbonated. The cooled clinker with the aid of the growing rollers 8, located under the chamber 12, is discharged into the funnel 17 and through the sluice gate 18 enters the conveyor.

The air supply is dried by the fan 19 through the hollow rollers 8. The gases coming from the furnace through the pipe 20 enter the dust precipitation device and then are removed with a smoke exhauster into the atmosphere.

Subject invention

A shaft kiln for sintering materials in a suspended layer, divided by horizontal grids into chambers, is characterized in that, in order to create a rational mode of burning in a suspended (boiling) layer, the sintering chamber of the material, expanded at the base, has a narrowing in its upper part, which increases the velocity of the heated air coming from below and creates a suspended (boiling) layer of material in which the fuel burns and the material burns, and in the lower part of the chamber a dense layer of burned material is formed, you the pivotal role of the gas distribution device.