SU1733881A1 - Device for production of lightweight filler - Google Patents

Abstract

The invention relates to the production of building materials. A device for the manufacture of a lightweight filler comprises a rotary kiln, a supply nozzle into the expansion zone of the dusting material, a screen installed in front of the outlet opening of the nozzle at the boundary of the expansion zone, and a material metering hopper. A supply nozzle into the swelling zone of the dusting material is mounted in the center of the furnace and connected to the fan. The device saves dusting powder and improves the quality of expanded clay by reducing the bulk density. 6 Il.

Description

The invention relates to the production of building materials and can be used, in particular, for the manufacture of lightweight aggregate, preferably expanded clay, obtained by dusting granules in rotary kilns in order to reduce the bulk density of the aggregate.

A device is known for additionally feeding powdered material into a rotary drum furnace at its hot end, which contains a pneumatic conveyor connected to the air channel of the fuel injector with two outlet pipes located inside the fuel injector. One of the nozzles is buried inside the nozzle and has a divider at the outlet, the other is located in the cut-off plane of the nozzle air channel and is provided with a nozzle at the exit. Nozzles are connected to the inlet pneumatic by means of a separator valve. Coming from the pneumatic conveyor (through the separator

valve) powdered material in the form of a pneumatic mixture is distributed through the nozzles. In the recessed branch pipe, which has an outlet divider, the kinematic energy of the pneumatic mixture is quenched and then picked up by the air pumped into the air channel of the nozzle is directed to the furnace. Another part of the pneumatic mixture, which enters the second nozzle, located in the plane of the cut-off of the air channel, the fuel nozzle and having a nozzle at the outlet end, is also directed into the furnace, but in the form of a compact jet.

The closest to the proposed one includes a rotary drum kiln and a duct supplying the dusting material to the expansion zone. The duct is mounted centrally in the furnace and is connected to the fan and the feeder of the dusting material. The air injected by the fan into the pipeline. In the course of its movement, the dusting material, evenly coming from the metering hopper, is collected and mixed with the dusting material.

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air and dust flow moving through the pipeline to the swelling zone. When moving along the pipeline, the air-dust stream due to ejection, draws water from the holes in contact with the pipeline of the water pipeline, dispersing it into small droplets, which, connected with the air-dust stream, form a mixture sprayed through a nozzle mounted on outlet end of the pipeline.

A disadvantage of the known device is the entrainment of dusting material by the furnace exhaust gases directed towards the spraying of dusting material ejected from the pipe nozzle at a considerable speed, which increases the amount of dusting material being carried out and, as a result, affects expressed in qualitative and quantitative terms.

The purpose of the invention is to reduce the consumption of dusting material and improve the quality of expanded clay.

The goal is achieved by the fact that the device for the manufacture of a lightweight filler, including a rotary kiln and a supply pipe for dusting material to the pellet expansion zone, mounted in the center of the furnace and connected to the fan, and the dusting hopper, is equipped with a screen mounted on the output the end of the powder supply pipeline at the boundary of the expansion zone.

At the exit end of the powder supply pipe, mounted in the center of the rotary drum kiln and connected with the fan and the powder feeder-metering hopper, an additional screen is installed on which the air-dust mixture, impact, settles at the boundary of the expansion zone , enveloping the reaction surface of the pellets moving along the furnace drum. The screen also functions as a shield that protects the dusting material from being carried away by a stream of furnace waste gases.

FIG. Figure 1 shows a device providing reception and delivery of a dusting material to a rotating drum kiln at the boundary of the expansion zone of the pellets; in fig. 2 and 3 — device in double-drum rotary kilns, one

of which with coaxial arrangement of drums, other - at different levels; in fig. 4 — node I in FIG. one; in fig. 5 — node 11 in FIG. one; in fig. 6 shows section A-A in FIG. one.

The device is a set of equipment that provides a uniform supply of dusting material, and consists of a cyclone 1 (storage hopper), a feeder 2, a fan 3, a supply pipe 4 connected to the delivery pipe 5, fixed in the furnace with the spokes 6. At the end of the delivery nozzle 5, a screen 7 is installed, reflecting a directional air-dust flow consisting of a mixture of air injected by the fan 3 and a dusting material. The screen 7 also serves as a shield that prevents dusting material from being carried away with a stream of furnace gases.

The device works as follows.

The refractory powder entering the cyclone 1 is collected by the feeder 2 and is fed to the inlet 4, connected to the fan 3 and the delivery 5.

The fan 3, injects air, mixes the latter with the refractory powder entering the pipe 4, creating an air-dust stream moving through the pipes 4 and 5 into the expansion zone of the granules, where the flow, reflected from the screen 7, settles at the boundary of the expansion zone, enveloping the reaction surface of the granules moving along the drum.

The use of the proposed device makes it possible to reduce the loss of dusting material from the entrainment of the furnace exhaust gases, increase the efficiency of coating the granules with dusting material, and improve the quality and quantity of the finished product.

Claims (1)

Invention Formula A device for the manufacture of a lightweight filler, including a rotary kiln and a supply nozzle into the expansion zone of dusting material, mounted in the center of the kiln and connected to a fan, and a material metering hopper, characterized in that, in order to reduce the consumption of the latter, to improve the quality of the claydite It is equipped with a screen mounted in front of the outlet of the nozzle at the boundary of the swelling zone. f / eUy o // aSa /} a5cfw / cf Sc / paSa weffSaptHveMttau mmubrabuyuhi / Gfeymyu mind kam Fig 2 mind camera SaflcrSafS 3criyttЈtffaf # e / jt FIG. 3