SU1703931A2 - Rotary drum for heat treatment of friable materials - Google Patents

Abstract

The invention relates to the design of a rotating drum for the heat treatment of bulk materials and can be used in the production of mineral fertilizers, chemical, metallurgical and other industries. The aim of the invention is to intensify the heat treatment process and stabilize the final moisture content of the material. When moving the material in the last section 3 along additional pipes 7 fixed coaxially at the outlet ends of the main pipes 4, heat exchange is intensified, since The pipes 7 are made with a cross section smaller than the section of pipes 4. The pipes 7 are equipped with their own blades 8, whose width is less than the width of the blades of 5 main pipes 4 by an amount equal to the difference of the radii of these pipes. 3 il.

Description

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The invention relates to the technique of heat treatment of bulk materials, can be used in the production of mineral fertilizers, chemical, cement, metallurgical and other industries and is an improvement of the invention on the main author. St. No. 1060896.

The aim of the invention is to intensify the heat treatment process and stabilize the final moisture content of the material.

FIG. 1 schematically shows a drum; in fig. 2 is a section A-A in FIG. one; in fig. 3 - pipe construction.

The rotating drum for heat treatment of bulk materials comprises a body 1, which is divided into a series of sections with lifting blades 2, the last of which section 3 is made up of a set of pipes 4 with lifting blades 5, symmetrically located with respect to the axis of the body. In front of the pipes 4 of the last section a system of reloading blades 6 is mounted,

The blades in the sections to the pipe nozzle have a length and width that increase in the side of the pipe nozzle, are installed in a checkerboard pattern and have an end gap between the sections,

Each pipe 4 of the last section 3 is equipped with an additional pipe 7 of smaller section fixed coaxially at the ends of the main pipes, and the width b of the blades 8 of the additional pipe is less than the width of the blades of 5 main pipes by an amount equal to the difference between the radii of the main R and additional pipes g), t . b R - g.

The drum works on the track.

Bulk material, ne riger phosphorite flour with an initial moisture content of 10–18%, which is dried, is not shown from the unloading device) and coolant (flue gases with a temperature of 300–800 ° C) are fed into the drum 1 of the rotating drum. The material and the heat carrier in the flow are successively all sections in which the heating and drying of the V.ve. In order to intensify the drying process and stabilize the final moisture of the material when the material is loaded with high humidity, changes in the drying capacity of the material with different dispersion and degree of moisture contact with the solid material, the main pipes 4 in the last section are equipped with additional pipes 7 of smaller section fixed coaxially the ends of the main pipes, and the width of the blades 8 in additional pipes is less than the width of the blades of the 5 main pipes by an amount equal to the difference of the radii of the main and additional pipes.

When moving to the pipes, the material is poured over the blades of the m sections, while the blades in the sections have a length and width increasing towards the pipe fitting, are installed in a staggered order and have a rift gap between the sections. This makes it possible to intensify the process of heating and drying the material at the initial stage.

The material is then loaded into the main tubes 4 into the lifting blades 5 by means of reloading blades 6. As the material moves through the main tubes with the lifting blades, the heat treatment process is intensified as a result of an increase in the velocity of the heat transfer fluid and the surface of the material. Further movement of the material into additional pipes 7 provides additional intensification of heat treatment and stabilization of the final moisture of the material by increasing the rate of material flow by the flow of heat transfer fluid, increasing the residence time of large particles in the main pipes, as well as creating a developed surface of heat and mass transfer, as additional pipes create support moved material.

The intensification of heat treatment and the stabilization of the final moisture content of the material, first of all, large particles, is provided by changing the design of the blades of additional pipes whose width is less than the width of the blades of the main pipes by an amount equal to the difference between the radii of the main and additional pipes. In this case, the speed of movement of large particles along the additional pipe is reduced, and the speed of movement of the heat transfer medium over the material is increased.

Reducing the width of the blades of additional pipes also reduces material loss.

When the width of the blades is less than the difference between the radii of the main R and the additional g of pipes, the pouring of the material deteriorates and the drying intensity decreases, and with an increase in the width of the blades b more than the specified value, the entrainment of wet particles increases, which does not stabilize the final moisture content of the material.

Thus, the optimum width b of the blades of the additional tubes is the difference of the radii R-r of the main and additional tubes.

The proposed rotating drum provides increased productivity due to process intensification.

heat treatment, improving the quality of the finished product while stabilizing the final moisture of the material, saving energy resources: fuel, while reducing unit costs by increasing productivity and electrical energy by reducing the load on the electric wire of the rotating drum, since the additional ones along with the main pipes are placed along the periphery of the drum and with a uniform loading of the material through the pipes, the torque transmitted to the drum from the electric drive decreases.

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Claims (1)

Claims Rotating drum for heat treatment of bulk materials according to the author. St. 1st 1060896, characterized in that, in order to intensify the heat treatment process and stabilize the final moisture content of the material, the latter section is equipped with additional pipes fixed coaxially on the outlet ends of the main pipes, made with a cross section smaller than the latter, and equipped with their own blades whose width less than the width of the blades of the main pipe by an amount equal to the difference of the radii of these pipes. t eight 8 r-r Fig.Z five