RU218432U1 - DRUM FURNACE FOR DRYING WET GROUND MATERIALS - Google Patents

Abstract

The utility model relates to a device for drying wet solid waste intended for recycling and can be used in agriculture, chemical, food and other industries. SUBSTANCE: drum kiln for drying wet crushed materials contains an inclined rotating drum mounted on support rollers fixed on a fixed frame, nozzles for loading and unloading material installed on the drum covers, a pipe for supplying a drying agent installed on the end cover of the drum, closing the drum with one side, pipes for removing wet gas from the drum, which is formed during the drying process, installed on the end cover, made fixed, closing the drum on the other side, while the fixed frame is installed on supports that regulate the angle of the drum, a sensor for measuring the temperature of the processed material is installed inside the drum , made with the possibility of lowering the temperature of the drying agent when it exceeds the permissible one, the pipe for supplying the drying agent is made inside the drum, while in the lower part of the pipe along its entire length there are holes for uniform supply of the drying agent under pressure to the material, pipes for removing wet gases are perforated with a hole size smaller than the particle size of the crushed material, an elastic plate is fixedly mounted on the central pipe inside the drum, touching the inner surface of the drum, while a sensor is installed at the outlet of the drum, capable of measuring the moisture content of the material, depending on the value of which the amount of material fed into the drum changes, the outer surfaces of the drum and end caps can be made thermally insulated. The technical result of the utility model is the creation of a drum oven for drying wet crushed materials. 1 w.p. f-ly, 2 ill.

Description

The utility model relates to a device for drying wet solid waste intended for recycling and can be used in agriculture, chemical, food and other industries.

A rotary electric furnace is known, which includes a heat-insulated pipe, supports in the form of rollers, a pipe rotation mechanism and an electric heater made in the form of a hollow fixed beam, a heater (Pat. 2240479 RF IPC F27B 7/00: application 2002 1325 17/02 dated 03.12.2002 published on 20.11.2004 Bull. No. 32).

The disadvantage of this oven is that drying occurs only due to the radiant heat of the electric heaters, which reduces productivity, especially when processing wet materials, the maximum heating temperature of which is limited. In addition, the need to use the thermal insulation of a hollow beam, to reduce its deformation during heating, complicates its manufacture and reduces the service life. The consumption of a large amount of electricity significantly increases the cost of the drying process.

Known installation for heat treatment of bulk materials containing a drive, a rotating drum with internal longitudinal flanges, a screw with perforated turns and a hollow shaft with longitudinal screw windows, and an adjustable screw rack to change the inclination of the drum (Pat. 2.534398 RF IPC F26B 11/04, application 2013117445, 06 dated April 16, 2013, published on November 27, 2014 Bull. No. 33).

The disadvantages of this installation are the low reliability of its operation due to the complexity of the design, high labor intensity in manufacturing, low productivity due to the loading and unloading of the processed material into the rotating drum through its side surface, which eliminates the continuity of the drying process.

Known installation for heat treatment of bulk materials, which contains a rotating drum with an internal hexagonal perforated box and auger, a drive, loading and unloading nozzles (Pat. Bulletin No. 33).

The disadvantage of this installation is low productivity due to sticking of wet materials on the surface of the screw and drum, high consumption of hot gas due to heat loss, complexity in manufacturing and operation of the installation.

Known drum dryer with a channel nozzle containing a rotating drum with longitudinal channels, fixed devices for loading and unloading the processed material, supply and exhaust air for drying (Pat. RU 2367865 C1 IPC F26B 11/04, application 2008128107/06 dated 07.09.2008, published 2009.09.20).

The disadvantages of this installation are the complexity of the design, the high labor intensity of manufacturing, low reliability due to sticking of materials with a high specific gravity on the profile nozzles of the drum, the removal of a part of the drying agent through the loading device, which leads to a decrease in drying efficiency, a decrease in productivity and an increase in the cost of its operation.

Known drum kiln for drying sand, taken as a prototype, which contains a rotating inclined drum, support rollers mounted on a fixed frame, a drive that rotates the drum, filling and outlet mouths for supplying and unloading material, a gas burner, hot gases from which are fed into the drum, the outlet for the removal of gases (RU 132875 U1, F26B 11/04, 09/27/2013, D1).

The disadvantage of this furnace is the supply of the drying agent (heated exhaust gases) directly to the inlet of the drum, inside which a laminar flow is formed with a low coefficient of convective heat transfer to the drying material, which leads to a low efficiency of the drying process. In addition, when removing water vapor with exhaust gases, particles of the processed material can be removed through the outlet neck, which does not allow using this installation for drying lightweight materials.

The technical result of the utility model is the creation of a drum oven for drying wet crushed materials.

The technical result is achieved by the fact that the furnace contains an inclined rotating drum lying on the support rollers and a drive for its rotation, installed on a fixed frame, nozzles for loading and unloading material, a pipe for supplying a drying agent, pipes for removing moist gas formed in the drum from the drum. during the drying process, installed on fixed end caps that close the drum, while the pipe for supplying the drying agent enters the inside of the drum, while holes are made in the lower part of the pipe along its entire length, through which the drying agent under pressure uniformly flows to the material, pipes for output wet gas is perforated with a hole size smaller than the particle size of the crushed material, a sensor is installed at the outlet of the material from the drum, which measures its humidity, depending on the value of which changes the amount of material fed into the drum, a sensor is installed inside the drum that measures the temperature of the processed material and is fixedly installed elastic plate touching the inner surface of the drum.

In FIG. 1 and FIG. 2 shows a drum oven. The furnace contains a drum 1, which rests on rollers with a flange 2 and smooth rollers 3. The rollers are mounted on an inclined frame 4, the angle of inclination of which is regulated by supports 5. On the frame 4 there is a drum drive 6 and covers 7 and 8 covering the ends of the drum 1. On The lids are equipped with nozzles 9 and 10 for loading and unloading material. On the lid 7, a pipe 11 is fixed, which enters the inside of the drum 1 to a depth of more than two thirds of its length. Holes are located in the lower part of the pipe along its entire length. The end of the pipe, located inside the drum, is closed, and from the other end, a drying agent is fed into the pipe, which uniformly flows through the holes to the material being processed. Perforated pipes 12 are fixed on the cover 8 in its upper part, leading inside the drum to a depth of up to one third of its length. The ends of the perforated pipes inside the drum 1, and through their open ends through the perforation out of the drum 1 moist gas generated during the drying process. At the outlet of the drum 1, a sensor 13 is installed, which measures the moisture content of the processed material. Inside the drum, a sensor 14 is installed that measures the temperature of the material located there and a fixed elastic plate 15 touches the inner surface of the drum. The outer surfaces of the drum 1 and covers 7 and 8 are covered with heat-insulating material 16.

Drum oven for drying wet crushed materials works as follows.

Drum 1 rests on rollers with flange 2 and smooth rollers 3. Rollers with flange 2 fix the position of drum 1, rollers 3 ensure its unhindered expansion when heated. The drum 1 is driven by the drive 6 through a chain, gear or belt drive (not shown conventionally). Depending on the drying material, the inclination of the frame 4 and the speed of rotation of the drum 1 are set, which determines the speed of its movement during drying. Wet material through the pipe 9 is fed into the drum. The drying agent under pressure enters the pipe 11 and further, through the holes in the lower part of the pipe, to the processed material, carrying out its aerodynamic drying. The gas saturated with moisture during the drying process is removed through perforated pipes 12 installed in the cover that closes the end of the drum from the unloading side. The dimensions of the holes in perforated pipes are smaller than the sizes of small suspended particles formed during the mixing of the processed material with a drying agent. This excludes the removal of these particles together with wet gases. To reduce the amount of suspended particles, the total area of the holes in the perforated pipes through which the wet gas is discharged is larger than the area of the holes in the pipe through which the drying agent is supplied. A sensor 13 is installed at the output of the processed material, which determines its moisture content. To ensure the optimal drying mode, when the moisture value of the processed material deviates, the supply of the processed material changes. This allows you to ensure high quality drying and get maximum productivity when processing various materials. A sensor 14 is installed inside the drum 1, which measures the temperature of the processed material. The outer surfaces of the drum and fixed end caps are covered with heat-insulating material, which reduces heat loss during operation. The elastic plate 15 cleans its inner surface from adhering material during the rotation of the drum.

A drum kiln 8 m long and 2 m in diameter was made. Hot air at 140° C. supplied by a high-pressure fan at a flow rate of 1200 m ³ /h was used as the drying agent. Consumption of processed material 6000 kg/h. Chain drum rotation drive. During tests, the furnace provided a reduction in the moisture content of crushed waste from 50% to 20%, which makes it possible to utilize them in thermal reactors.

This design of the drum furnace allows to obtain a high productivity of the drying process at a relatively low cost of its operation, while ensuring high quality of the processed material, the possibility of automating the process, as well as its use for drying lightweight finely divided materials.

Claims (2)

1. A drum oven for drying wet ground materials, containing an inclined rotating drum mounted on support rollers mounted on a fixed frame, nozzles for loading and unloading material installed on the drum covers, a pipe for supplying a drying agent installed on the end cover of the drum, closing drum on the one hand, pipes for removing wet gas from the drum, which is formed during the drying process, installed on the end cover, made fixed, closing the drum on the other side, characterized in that the fixed frame is mounted on supports that regulate the angle of the drum, inside the drum is installed a sensor for measuring the temperature of the processed material, made with the possibility of lowering the temperature of the drying agent when it exceeds the permissible one, the pipe for supplying the drying agent is made inside the drum, while in the lower part of the pipe along its entire length there are holes for uniform supply of the drying agent under pressure to the material , the pipes for the output of wet gas are perforated with a hole size smaller than the size of the particles of the crushed material, inside the drum on the central pipe an elastic plate is fixedly installed, touching the inner surface of the drum, while a sensor is installed at the outlet of the drum, which is configured to measure the moisture content of the material, depending on the value of which the amount of material fed into the drum changes. 2. Drum furnace according to claim 1, characterized in that the outer surfaces of the drum and end caps are made heat-insulated.

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