SU141798A1 - Shaft furnace for burning sintered materials in a fluidized bed - Google Patents

Description

BASIC Auth. ev ° 118359 a kiln was described for the materials in the suspended layer, in which the upper preparatory part of the shaft was provided in the form of several chambers formed by horizontal grids with suspended material layers.

Experimental verification has shown that the gratings during firing of speckapdix materials do not ensure the stable operation of the furnace.

The present invention ensures the stable operation of the furnace with the collection of dust from gases that come out of the boiling bed of the furnace while simultaneously reducing their temperature.

For this purpose, in the upper preparatory zone of the furnace, a series of funnels filled with material are installed with guides located under them. The latter are equipped with adjustable cones, and the gaps between chutes provide the passage of gases into the layer of material in the funnels. When materials pass through, the gases, being cooled, are freed from dust and, for complete purification, pass through a cyclone, from which the settled dust enters the boiling bed.

The drawing shows schematically the proposed furnace in two projections with partial vertical cuts.

The baking furnace for baking the cakes, their materials in the skirt, eats the layer includes, as the main part, the shaft / oval section, lined from the inside with refractory bricks and enclosed from the outside in a metal casing. In the upper preparatory zone of the furnace, a number of funnels 2 are installed with guides 3 located under them. Funnels 2 in the process of operation of the furnace are laid by the material; The chutes 3 are provided with adjustment cones 4, allowing more flexible control of the firing process. Nozzles 5 provide fuel supply

No. 141798- 2 (gas charger, 1ZHN / from coal dust) into the furnace. In the lower part of the furnace there is a discharger 6. From the bottom of the shaft 1, there are abutments 7 with closures 8. Overly shaggy / closed by a cap I connected by a flue q with a cyclone 10, and the closure //.

i The furnace is operated in the following manner.

Isho / C1i ,. K granular or small-cube species by fjgy6, aM. D.2, dod1v "" - funnels 2, then into chutes 3, and then successively into the fluidized bed of the burning zone} 3 and the dense layer of the cooling zone 14. The burned material is discharged by the unloading device 6 through the shutter 8 and fed to the conveyor 15. Gases (combustion products of fuel) coming out of the fluidized bed of the furnace pass through the gaps between the craters 2 and chutes 3, in which the calcined material lies at an angle of repose And is filtered through a layer of material in the funnels 2. In the latter, it (gas) is cooled and cleaned of dust. Then, the gas for complete purification enters the cyclone 10, from which seeding dust is fed through the shutter 11 into the fluidized bed. The cleaned gas is removed by the exhaust fan into the chimney. The proposed stove is beneficial and improves thermal efficiency. Recommended for the manufacture and testing of a prototype.

Subject invention

Shaft furnace for firing of sintering materials in a fluidized bed according to ed. St. N ° 118359, characterized in that, in order to trap dust from gases coming out of the fluidized bed of the furnace and reduce their temperature, in the upper preparatory zone of the furnace a series of funnels filled with material are placed with located below them cones guiding chutes, through the gaps between which the gases enter the layer of material in the funnels, where, cooling, they are freed from dust and pass through a cyclone, from which settled dust enters the fluidized bed, for complete purification.

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