SU1448179A1 - Rotary furnace - Google Patents

Abstract

The invention relates to the building materials industry, namely to devices for the production of expanded clay from intumescent materials. The purpose of the invention is to provide optimal conditions for the expansion of the material. For this, the rotary kiln comprises a lined casing 1 with a preheating zone 2 and a swelling zone consisting of a conical 3 and a cylindrical 4 sections with the direction of the larger base of the cone in the direction of movement of the material. The conical 3 and cylindrical 4 sections of the intumescent zone are rigidly interconnected, and the length of the conical section is 1 (4-20) x X (R - g), where R is the radius of the larger base of the cone; d is the radius of the smaller base of the cone, which ensures that the speed of movement of the granules increases in the volume and the double twisting of the calcined material along the entire length of the furnace. 1 il. SL

Description

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The invention relates to the industrial use of building materials, namely, devices for production. expanded clay from intumescent materials during firing,

The purpose of the invention is to provide optimal conditions for the expansion of the material.

The figure shows schematically the proposed rotary kiln, longitudinal section.

The rotary kiln comprises a lined casing 1 with a preheating zone 2 in the form of a cylindrical section and an expansion zone consisting of a conical 3 and a cylindrical 4 sections with the direction of the larger base of the cone in the direction of movement of the material. The conical and cylindrical sections of the swelling zone are rigidly interconnected, and the length of the conical section 1 is 1 (4---20) (R - f), where R is the radius of the larger base of the cone; r is the radius of the smaller base of the cone. An actuator -5 is provided for driving the furnace in rotation, the furnace is heated by a burner 6.

The rigid connection of the sections of the swelling zone ensures a uniform movement of the layer of material along the entire length of the furnace, regardless of the diameter and shape of the sections and the constant thickness of the layer of material in them. Constant speed and thickness of the layer provide a smooth but intensive supply of heat to it and, accordingly, to individual granules, which allows you to extract the most complete resources of the raw material by swelling, increase the uniformity of expanded clay gravel in bulk density and strength.

The length of the conical section, equal to (4 - 20) (R - g), ensures the leveling of the speed of movement of the increasing in volume granules in this section for clay raw materials, which are characterized by different swelling. When performing the conical-section of the swelling zone with a length of 1 4 (R - g), its length becomes insufficient for the flow of physicochemical swelling reactions that already occur in the cylindrical section of the swelling zone, which leads to an increase in the thickness of the layer of material and decrease in its speed, means to the deterioration of heat transfer, which corresponds to

loss of optimal heaving conditions. When performing a conical section of length I 20 (Fc - g), physicochemical reactions that provide an increase in the volume of the granules and, accordingly, an increase in the thickness of the layer, are completed on a part of this section and a decrease in the speed of movement of the layer

the material in this case is not compensated by a change in the diameter of the furnace of this section.

Rotating oven works as follows.

When the material moves along the cylindrical section of the pre-heating zone 2, it protects the elementary physical processes and chemical reactions that do not

practical influence on the rate of doubling of the material. As the material moves into the conical 3 section of the expansion zone, the granules begin to swell, i.e. increase in volume. Due to the expansion of the conical section in the course of the movement of the material, its speed and thickness of the layer remain constant over the entire length of the section.

With the same speed and thickness of the layer, the material enters the cylindrical 4 section of the expansion zone, where the processes forming the expanded clay granules that do not cause an increase in their volume are completed, resulting in the material moving speed and its thickness remaining equal to those of the same name in the conical part, i.e. . Increasing the movement speed of the granules increasing in volume and equal duplexing of the calcined material along the entire length of the furnace is provided.

The proposed rotary kiln design ensures that the material is heat-treated under optimal conditions, while the density of the lightweight aggregate decreases, the homogeneity and strength of the aggregate increases, the productivity of the kiln increases, and the power and fuel consumption is reduced.

Claims (1)

Invention Formula A rotary kiln containing a lined body with a preheating zone in the form of a cylindrical section and with an expansion zone consisting of a conical and cylindrical section. 31448179 sections with a larger base direction, sections are rigidly connected between the vanes of the cone in the direction of movement with themselves, and the length of the conical section 1 of the material, which is different, is 1 (4-20) "(K-d), the purpose of providing the optics where R and r are the radii of the larger and smaller conditions of expansion of the material base of the cone, respectively,