SU1046228A1 - Method for roasting expanding materials - Google Patents

Abstract

THE METHOD FOR BURNING EXPLOSION OF MATERIALS IN PRESENT, predominantly clay rocks, in a rotating single drum countercurrent furnace, including heating of the material in the zones of heat preparation and swelling and supply, secondary air, heat, and with the aim of providing a step , the secondary air is supplied in the furnace between the heat treatment and expansion zones. ND 00

Description

The invention relates to the sawing of building materials and can be used for heat treatment in the rotary kiln of intumescent materials, mainly clay clay-rock.

Research and practice in the production of claydite have established that the greatest effect of swelling of clay rocks is achieved by the step TbiNr of heating the material at the stages of thermal preparation and swelling, for which double-drum rotary kilns flj are used.

However, this method of firing does not provide a stable stepwise process of heat treatment after a given temperature curve of firing of expanded clay, requires a complex design scheme for its implementation, which limits its scope.

The closest to the proposed method is the firing of intumescent materials, mainly clay rocks, in a rotary single drum countercurrent furnace, which includes heating the material in the heat treatment and expansion zones and supplying secondary air. Secondary air is injected with special nozzles into the zone of maximum material heating (. ) to prevent overheating of the material and its fusion into lumps-agglomerates. This method is aimed at improving the quality of the finished calcination product C2.

However, the known method does not allow to achieve the greatest swelling effect, since it does not provide for the stepwise heating of the material at the stages of thermal preparation and swelling.

The purpose of the invention is to provide stepwise heating of the material.

The goal is achieved in that according to the method of firing intumescent materials, mainly clay, in a rotating single-drum counter-current furnace, including heating the material in soHcix preparation and expansion and supplying secondary air, the last is heated into the furnace between the preparation and expansion zones.

FIG. Figure 1 is a diagram of a rotary drum furnace; in fig. 2 - temperature curves firing in the furnace; Fig. 3 shows an annular slotted nozzle with a regulator of the nozzle outlet section.

The rotary kiln contains a burner 1, a discharge unit 2, a lined body 3, a loading unit 4, a system 5 for selecting a treated heat carrier with a smoke exhauster and a system -6

cleaning dust from the central pipe 7, mounted coaxially with the furnace using racks 8, adjusting rod 9 with the steering wheel 10, installed inside the central pipe on supports 11. The central pipe 7 is connected by a seal 12 with a stationary air supply unit 13, in front of which is installed an adjusting gate 14 and a fan 15

0 supply of secondary air. The opposite end of the pipe is rigidly connected to the socket 16, and at the end of the rod 9 inside the furnace there is a rigidly fixed cone 17 with perforation 18 on its forming surface. Bell 16

5 and the cone 17 form an annular slotted nozzle, and the width of the annular gap is adjusted by a tight 9 and a steering wheel 10.

The method is carried out in the following way.

The secondary air ventilator 15 through the adjusting gate 14 is fed to the fixed unit 13 and further to the central tube 7. Move

5 along the central tube 7, the air cools it, which prevents the destruction of the tube. Then the air enters the annular slit nozzle between the socket 16 and the cone 17 and

0 given speed enters the furnace. The speed of the secondary air exit to the furnace through the annular nozzle is controlled by varying the width of the gap P- between the socket 16 and the cone 17 with the help of a pull 9 and handwheel 10.

5 Part of the secondary air from the pipe 7 passes through the perforations 16 of the cone 17 and, thus, prevents the flue gas from contacting the furnace with the cone 17, which increases its service life.

The secondary air is mixed with the furnace flue gases, and the temperature of the mixture decreases sharply (curve 5 in fig. 2), which is capable of creating a temperature difference between the zones of material heat-treating and swelling. With this mate, the rial before entering the zone

0 swelling is under the influence of relatively low temperatures (400-800 ° C), which reduces the burning out of the organic matter of the matter, contributes to an increase in

5 coefficient of swelling when the material is deposited in the zone of maximum temperatures (swelling).

By varying the amount of incoming air to the kiln 60 of the secondary air, it is possible to change the appearance of the stepped firing temperature curve (curves 2a, 26. in Fig.). Curve 1 in FIG. 2 corresponds to the temperature curve of the gigout without the supply of secondary air

and does not have a temperature jump (step).

The use of the proposed firing method allows to improve the quality of the expanded material due to its maximum expansion and, accordingly, to increase the furnace productivity while ensuring

the stability of the stepwise heat treatment process according to a given temperature curve for burning keraglsite depending on the properties of the feedstock. The method can find a wide application in the production of expanded clay in single drum rotary kilns.

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Claims (1)

THE FIRING METHOD I REMAIN -. 1 BIKING MATERIALS, advantageous of clay rocks, in a rotary single-drum countercurrent furnace, including heating the material in the heat treatment and expansion zones and supplying secondary air, characterized in that, in order to provide stepwise heating of the material, secondary air is supplied to the furnace between the thermal treatment and expansion zones .