SU691661A1 - End portion of the loading part of a rotary kiln - Google Patents

Description

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The invention relates to the firing technique for materials in rotary kilns and can be used in cement and refractory production for baking materials under high temperature conditions.

A known rotary kiln, intended for firing difficult-burning lump materials, containing a cylindrical refractory lined brick with a slope and rotating around its axis. In the loading part of the drum, a cochlea feeder is fixed on the housing, and from the dust-collecting chamber side, a retaining washer is installed on the butt-end of the housing, which is made corrugated with radially arranged corrugation 1.

In a known rotary kiln, a retaining washer, made corrugated with a radial arrangement of corrugations, does not provide stability of the aerodynamic resistance of the kiln, as Kak radial arrangement of the corrugations creates a vortex of exhaust gases at the exit of the kiln, which contributes to an increase in the removal of small fractions of the calcined material and does not allow to regulate cross-section of the end of the boot part without replacing the retaining washer. The reliability of the fixing of the lining bricks and the loading section of the drum in a reliable state is not ensured. The destruction of the lining of the furnace body leads to the appearance of cracks on the exposed surface by means of a lock washer, through which the calcined material enters the dust collection chamber.

The closest in technical essence and the achieved result to the described invention is the end of the charging part of the rotary kiln, comprising a body lined with refractory bricks, a retaining washer and a ring mounted on the butt of the body made of separate radially mounted segments 2.

A disadvantage of the known design of the end face is that it is impossible to ensure the stability of the aerodynamic resistance of the furnace at a constant inlet section.

The purpose of the invention is to ensure the stability of the aerodynamic drag in the furnace by adjusting the inlet section.

This goal is achieved in that the end of the boot part of the rotary kiln, comprising a body, a lining with refractory bricks, a retaining washer and a ring mounted on the butt of the body, made of j of separate radially installed segments, is provided with a set of pads placed under the base of the ring segments installed with mutual overlapping each other, and the inner 10 NY diameter of the retaining washer is equal to the inner diameter of the lining,.

FIG. Figure 1 shows the end of the charging part of a rotary kiln, a continuous section; in fig. 2 is a view A 5 of FIG. one; in fig. 3 - node 1 figure 1.

The rotary kiln contains case 1 ,, lined with refractory bricks 2. In the loading part of the furnace, case 1 is fixed to a cochlea feeder 3, closed by a fixed casing 4, which is loaded with firing point 5, the material intended for firing.

The refractory lining brick 2 at the end of the body 1 rests on the retaining washer 6.

The retaining washer b is circumferentially fastened to body 1 by bolts 7, and from the end circumferentially fixed to ring 8 by means of bolts 9. At the same time as retaining washer 6, a ring 11 is installed on the side of dust-collecting chamber 10, consisting of identical mutually overlapping circular segments fixed along circle 35 with bolts 7.

The internal diameter of the ring 11, which is the inlet section of the furnace body 1, is adjusted during installation using the set of linings 12. 40

Rotating oven works as follows.

During the rotation of the housing 1, the cochlear feeder 3 captures the material and feeds it into the cavity of the furnace through the loading windows. In rotating ghech material is in semi-weighted states.

Retaining washer 6, made to the height of the lining of the refractory core- Q

Picha 2, it is protected from exposure to waste gases and, in turn, ensures durability of the lining.

The ring 11 does not take the load C9 of the side of the lining during its thermal expansion and eliminates the turbulence of the exhaust gases, reducing the aerodynamic drag in the furnace body 1, which depends on the diameter of the furnace inlet section.

Tests of the proposed design of the butt end of the loading part of the rotary kiln showed reliability and durability when the kiln is operated with an increased calcining temperature of the piece material. Regulation of the inlet section of the furnace by changing the diameter of the ring with the help of a set of liners was achieved, the burned material was prevented from entering the dust-collecting chamber and the emission of fine fractions with waste gases was reduced.

Claims (2)

1. USSR author's certificate 512335, .cl. F 27 B 7/32, 1974. 2. Zaitsev V.V. Improvement of some nodes of rotary kilns - Refractories, 1976, 12, p. 49-50. Vui.l