SU1737243A1 - Device for cooling loose material in fluidized bed - Google Patents

Abstract

Use: for cooling expanded clay gravel. The essence of the invention: the part of the bottom, adjacent to the conveyor, is made solid. The bottom is tilted towards the discharge at an angle of 10-20 °. The discharge conveyor is equipped with side walls. The sealing of the side walls of the conveyor is made in the form of rubber bands bent to both sides and adjacent to the conveyor belt. A pressure sensor is located in the pressure chamber connected to the conveyor drive. 2 Il.

Description

The invention relates to devices for cooling and drying bulk materials and can be used in the building materials industry, for example, for cooling expanded clay gravel, as well as in the agricultural, metallurgical and chemical industries.

A rotary drum cooler is known, comprising a drum inclined at an angle of 45-50 ° to the horizon, a material level sensor automatically connected to the conveyor, a device for supplying air for cooling, made in the form of a collector placed around the drum 0.25-0, 45 of its length from the top edge.

A disadvantage of the known device is the low effect of heat transfer due to the large angle of inclination of the drum to the horizon (45-50 °). This angle is much larger than the internal friction angle (30 °) of a material such as expanded clay, therefore,

the material inside the drum will move at high speeds and the drum will perform the functions of a stove, and since the cooling air enters the upper part of the drum, the material, which has high speed and dense flow, does not have time to cool completely, therefore when filling the drum to fixed by the sensor, the uncooled material sticks to the bottom of the drum, which reduces the reliability of the device,

The closest to the proposed technical entity is an air wagon-cooler, which contains a chamber with a perforated grille, installed with a slope of 5-8 in the direction of material movement, a switchgear for supplying air for cooling and an umbrella for discharging it, louver adjusters, devices for loading and unloading material.

The disadvantage of this device is its tendency to clogging large

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fractions and inclusions with a size of 20-70 mm, for the removal of which it is necessary to stop the technological process. In addition, louvre controls do not provide control over the height of the material layer along the length of the lattice, as they are installed at the outlet end of the refrigerator lattice, and the angle of inclination of the perforated lattice of 5-8 ° does not provide sufficient material movement speed refrigerator, i.e. the material layer is sealed, which reduces the efficiency of heat transfer. In the known device, the material is unevenly distributed along the length of the lattice. Its greatest accumulation is observed in the loading end and in front of the louvered regulators, which impairs heat transfer in these places, and in the case of a decrease in the level of the material, it leads to inappropriate consumption of air in the middle part of the grid.

The purpose of the invention is to increase the reliability of operation, ease of operation and reduce the dustiness of the surrounding space.

The goal is achieved by the fact that the device is equipped with a pressure sensor placed in the pressure chamber and connected to the conveyor drive, part of the bottom adjacent to the conveyor is solid, the bottom is set at an angle of 10-20 ° to the horizon, and the conveyor is made with side walls with a seal E in the form of rubber bands bent to both sides.

FIG. 1 shows an apparatus for cooling a particulate material in a fluidized bed; FIG. 2 is a section A-A in FIG. one.

The device comprises a chamber 1 with an inclined perforated bottom 2, a section 3 without perforation, a gate 4, side walls 5, a conveyor 6, a drive 7 of the conveyor electrically connected with a magnetic starter 8, the input of which is electrically connected through a converter 9 with a pressure sensor 10, seal 11.

The device works as follows.

Bulk material from the furnace (not shown) enters the cooling chamber 1 with a sloping perforated bottom 2, where cooled air flows through the perforated bottom, and the air velocity in the chamber must be such that the material is fluidized. The fluidized material is moved along a sloping perforated bottom 2, from which it is taken out at the exit by conveyor 6 and then fed to the warehouse. Monitoring the pressure of the cooling air, and therefore the height

The material layer is carried out by a pressure sensor 10 installed in the sublattice space.

The output control contacts of the pressure sensor 10 act on the magnetic starter 8, which controls the operation of the conveyor motor 6, the sensor responds to the change in static pressure under the perforated grille.

By increasing the height of the layer of material

in the cooling chamber, the static pressure under the perforated bottom increases. The pressure sensor 10 provides a signal for shutting down the conveyor 6, which discharges the material from the cooling chamber 1. In this case, a reduction of the layer of material in the cooling chamber 1 occurs and, consequently, the static pressure under the perforated bottom 2 of the cooling chamber 1 decreases. Sensor Contacts 10

the discharge conveyor 6 is shut off. Thus, the height of the layer in the cooling chamber is controlled to maintain the most efficient operation of the device for cooling bulk materials.

When used, this device can provide the following technical and economic advantages: reliable operation, efficient heat exchange, rational

use of cooling air, reducing the dustiness of the ambient air (environment).

Claims (1)

Invention Formula A device for cooling the bulk material in a fluidized bed, comprising a chamber with a perforated bottom inclined towards the discharge side, a pressure chamber placed under the bottom, and a discharge conveyor with a gate valve, characterized in that, in order to increase the reliability of operation, ease of operation and reduce the surrounding dustiness space, it is equipped a pressure sensor placed in the pressure chamber and connected to the conveyor drive, part of the bottom adjacent to the conveyor is solid, the bottom is set at an angle of 10-20 ° to the horizon, and the conveyor is made with side walls with seals in the form of rubber bands bent in both parties. 1 l