SU1170256A1 - Rotary furnace - Google Patents

Description

The invention relates to the construction materials industry, in particular to rotary kilns with adjustable thermal processes in the burning zone, for example, in the production of expanded clay gravel, cement and other building materials, by introducing a dusting powder and gas-medium into the burning zone.

The purpose of the invention is to improve on, 0 reliability and efficiency of the furnace.

FIG. 1 shows a longitudinal section: of a rotary kiln; in fig. 2 section A-A in FIG. one; in fig. 3 section of the furnace on the casing; in fig. 4 - 15

section bb in fig. 3; · in FIG. 5 layout of the casing and collector on a false shell; in fig. 6 is a diagram of the movement of gases in the furnace.

The rotary kiln comprises a housing 20 1 with a grooved casing 2 installed around it, on the side walls of which the seals 3 are mounted in the form of floating sectors. The casing 1 is fitted with pipes 4 with scoops 5. The pipes 4 are made curved with a slope angle of 10-60 ° with discharge ports 6 installed at an angle of 9-12 ° to the tangential lining. The bottom of the scoops 5 is inclined at an angle of 3-15 ° to the tangent of the casing. The bending of the pipe 4 can be smooth, made along the radius, or consist. from the knees (at least 2). In the casing 2 there is a hole 7 for feeding the opud- $$ rival with the help of the auger 8 located in the feed bin 9. 0 t ¹ verstier 7 is made at an angle of 40,

70 'from the vertical in the direction of rotation of the furnace. The screw 8 is mounted vertically or inclined. Regulating valve. 10 with installed under it. sieve 11 communicates with the consumable _;

a bunker 9 by means of an opening 12 made in the lower part of the casing 45 2. The casing 2 can be mounted on a false shell 13 mounted concentrically with respect to the axis of rotation of the furnace body 1.

To inspect the condition of the screw 8 and $ 0 unloading the grains of the material being blasted out of the dusting powder, the feed hopper 9 is made with hatches 14.

If it is necessary to supply gas-medium firing zone 55 to the furnace body 1 or to the false shell 13, a C-shaped collector 15 is installed, communicating with the internal cavity of the furnace through nozzles 16, 'inclined by 5-20 ^β angle to the vertical in the direction of material and 4-16 ° to the tangential lining of the furnace. The nozzles 16 may be located under the pipes 4 or be displaced towards the movement of the calcined material, i.e. set before them. The pipes 4 and the nozzles 16 are placed at a distance of not more than 1.5 times the furnace diameter from the burning zone. The collector 15 contains seals 17 with pipe 18 and nozzles 16.

Rotary kiln works as follows.

When the furnace is rotated, the scoops 5 capture the dusting powder supplied to the furnace casing 1 by the screw 8 through the hole 7 made in the casing. With further rotation of the furnace, the scoops 5 rise, the powder from the scoops is poured through the pipes 4 and poured out under the layer of the calcined material. This contributes to the inclination of the bottom of the scoops (3-15 °) to the tangent of the casing, the bending of the pipes 4 at an angle of 10-60 ° and the inclination of the discharge openings 6 at an angle of 2-12 ° to the tangent lining of the furnace.

The powder in the burning zone sticks to the surface of the granules heated to the pyroplastic state, which eliminates their sticking due to the high refractoriness of the powder, and allows you to carry out the burning process at temperatures close to optimal, with an increase in the quality of the finished product.

The screw 8 mixes the powder in the feed bin 9, eliminating co-formation, captures the powder and feeds it through the opening 7 of the casing 2 to the grab area of the scoops 5. With the change in the position of the control valve 10, and hence the cross-sectional area of the hole 12, the layer thickness changes - the amount of powder in the zone of capture of his scoops 5, what governs the number of captured powder in the burning zone.

The surplus of the powder through the edge of the control valve 10 is poured from the hole 12 to the sieve 11, which also receives grains from the baking material / spilled from the pipes

4. On sieve 11 is carried out section 1170256

the spraying device is free from spillage of the material being burned, while the powder comes into the feed bin 9, and the spill of the material being burned remains on the sieve or in the cavity below it and periodically removed through the hatch 14. The gas-medium through the nozzle 18 in the seal 17 is fed into the reservoir cavity 15 and through the nozzle.

16 enters the furnace, creating a rotating stream of gases moving in the direction of movement of the material through the burning zone. Rotating gas flow - partially cools the superheated lining and equalizes the temperature. between the lining and the calcined material, which prevents overheating of the grains, sticking and the formation of welds or baking the ring on the surface. ovens. At the same time, the rotating flow of gases creates a counter-pressure to the secondary air drawn from the furnace head, minimizing the amount of secondary air and, accordingly, the heat consumption for heating it.

Heated by the heat of flue gases and heat from the gas-environment temperature equalization, passing through the burning zone, is captured by the torch and in the form of a mixture enters the burning zone, participating in the process of fuel combustion and heat exchange.

Installing buckets supplying the powder in the casing 2 of the furnace separately from the collector 15 provides a vacuum in the casing 2 and eliminates pypevrashenie in the casing gas-medium and dust emissions from the furnace. Installing the casing 2 and the collector 15 on the false shell 13 ensures the normal operation of the seals and the furnace body.

Making the hole for feeding the powder in the furnace shell at an angle of 40-70 ° vertically along the direction of rotation of the furnace in the area of the powder gripper ensures stabilization of the process of gripping the powder as the dust sensor and the amount of powder fed into the furnace is stabilized.

The use of the proposed rotary kiln in the building materials industry in the production of expanded clay, in particular, makes it possible to increase the reliability of the kiln by reducing downtime and improve the kiln performance by 5-10%, while increasing the uniformity of the finished product due to stable feeding of the firing zone by the powder and leveling the temperature in the burning zone between the lining and the material to be calcined.

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FIG. I

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FIG. four

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FIG. five

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FIG. 6

Claims (1)

ROTATING OVEN comprising a housing with nozzles, tubes with scoops in the nozzles, a housing around the housing with an opening for feeding the powder with a screw located in the feed hopper, characterized in that * it is equipped with a control valve to improve the reliability and efficiency of the furnace installed under the sieve, communicating with the feed hopper, with the hole in the casing for the supply of the powder is made at an angle of 40-70 ° from the vertical during the rotation of the furnace. <e 5i „, 1170256 > 1170256