SU734488A1 - Rotary furnace - Google Patents

Description

(54) ROTATING OVEN

The invention relates to rotary kilns for the manufacture of lightweight FSCs, for example, ash gravel, expanded during firing and used in concrete mixtures.

A known device for producing calcined expanded clay, which is filled in the form of two rotary kilns: a drying and firing, are located one relative to the other so that their axes are mutually offset in the vertical plane ij.

The closest in technical essence and the achieved result to the invention is a rotary kiln for the production of lightweight aggregate, mainly ash gravel, containing a drum with drying, roasting and cooling zones formed inside it. In such a furnace, at the beginning of the burning zone, holes for powder accumulation from the hopper, which do not allow air into the drum 2, are filled.

A disadvantage of the known rotary kilns is that part of the gases, not subjected to rapid cooling, is removed, and the granules are not sufficiently porous, heavy. In addition, the pellets, after leaving the burning zone in the cooling zone, are rapidly cooled to a low temperature in a short section. As a result, the internal stress does not have time to be removed from the granules.

10 which is then caused by their cracking and deterioration.

The purpose of the invention is to improve the quality of firing.

15

This goal is achieved by the fact that a rotary kiln for the manufacture of lightweight aggregate, mainly ash gravel, containing a drum with zones of drying and cooling, formed inside it, is equipped with air suction chambers located behind the burning zone, each of which is made in the form of perforated

shell with reinforced on its outer

surface radial septa

and louvers in 1shzhnii

her parts enclosed in a still

a casing connected to the air supply chamber. In addition, the air duct is articulated

installed in the base of the flap

with counterweight.

FIG. 1 shows a rotary kiln b. cooling zone, general view; in fig. 2 - the same, without it; in fig. 3 is a section A-A in FIG. one; in fig. 4 - section BB in FIG. 3; in fig. 5 is a sectional view BB in FIG. 3

The rotary kiln includes a zone 1, a downstream zone-2 of firing, a zone 3 of normalization, a zone 4 of cooling, a device 5 for air leaks, a conveyor-cooler 6 with a heat sink grid and apertures 7, an air supply chamber 8, a fixed casing 9, perforated then the shell Yus radial partitions 11, louvered devices 12, flap 13 with counter-load, frame 14, jacking device 15, latch 16 slope of frame 14, lattice 17.

Rotating oven works as follows.

The molded granules enter the drying zone 1, where they are dried and heated to 50 ° C with the gases leaving the burning zone 2. The heated pellets enter zone 2 of the obn. in which their temperature reaches I5O ° C, and then to zone 3 of normalization, where the granules are rapidly cooled to. hardening conditions (9OO ° C) using the device 5 for air suction. The louvres 12 of the air suction device 5 and the fixed casing 9 do not rotate when the kiln drum rotates, which ensures air leaks in sectors with open louvres 12. Radial air permeable shell 10 is fed through the partition walls 11 from below. The air attacks into zone 3 of normalization directly on the layer of granules at the time of their softening into a plastic state and the evolution of gases that swell them up. It quickly cools them, preventing the release of compressed gases from the pores.

Voaduzia suction regulate louvered devices 12, Maintaining

Zone 3, the normalization of a constant temperature of 800-9OO C, provides for the removal of internal stresses from the granules. The furnace is equipped with two air suction devices 5, one of which is made between the burning zone 2 and the normalization 3, and the second - between the cooling zone 4 and the normalization 3.

Having passed the normalization zone 3, the granules at 80 ° -850 ° C fall into the cooling zone 4, then onto the cooler conveyor 6 with a heat-resistant mesh, on which they cool the air leaking upwards through the holes 7. Minor waste passes through the grate 17 into the air supply chamber 8, from where it is removed by means of a flap 13 with a counter load pivotally mounted in the main air supply chamber 5 of the chamber 8. The technological process in the furnace is controlled by changing the pitch angle of its frame 14 mounted on one side of the hinge the other is on the jacking device 15 with the latch 16 of the frame slope 14.

The advantage of the proposed furnace is to improve the quality of the ash gravel by introducing the normalization zone 3, in which the granules undergo rapid cooling during their softening into a plastic state and the evolution of gases, which contributes to an increase in the swelling effect and the quality of the granules.

The installation of the furnace frame 14 is hinged on one side, and on the jacking device 15 with a clamp 16, on the other, it is possible to change the angle of the furnace. This achieves the ability to control the process at the expense of the rate of advancement of the granules.

Claims (2)

1. A rotary kiln for the manufacture of lightweight aggregate, mainly ash gravel, containing a drum with zones of drying, roasting and cooling formed inside it, so that, in order to increase the quality of roasting of the material, it is equipped with behind the burning zone by devices for air suction with air-supplying chambers, each of which is made in the form of a perforated shell with radial reworkings 5 fixed on its outer surface 5 7344886 chambers and louvers in the mainstay, The lower part of it is enclosed in a non-received into account during the examination of the movable casing connected below with the air-supplying chamber. US Patent No. 3834862, 2. The furnace according to claim 1, about tl and h and y and a 5kl. 432-106, published. 1974. with the fact that the air passage chamber equipped with a hinge mounted in her2. Patent of the USSR No. 209336, the bases a guard with counterloading. f 27 B 7 / OO, publ. 1966.