SU1576189A1 - Granulator - Google Patents

Abstract

The invention relates to a device for the production of granules and can be used in all industries. The aim of the invention is to improve the quality of the obtained granules. The granulator comprises a cylindrical body 1 with a nozzle 2, fittings 3, 4 for loading the powder material and discharging the granules. A rotating shaft 5 with radial rods 6 is mounted inside the housing 1. The invention improves the uniformity of the particle size distribution by the fact that the free ends of three adjacent rods 6 are located at the vertices of isosceles triangles, the bases of which are parallel to the axis of the shaft 5 have a length of 3 ÷ 5 the diameters of the rods, and the distance between the rods 3-15 diameters of the rods. 4 tab., 2 Il.

Description

1

3

The invention relates to a device for the production of granules by intensive mixing of a powder material and a binder v can be used in all industrial fields associated with the processing of bulk materials.

The purpose of the invention is to improve the quality of the obtained granules.

Figure 1 shows the granulator; the general view5 of Figure 2 is the location of the mixing rods on the shaft surface.

The grauler contains a cylindrical body 1, on which the nozzles 2 are installed to introduce the binder.

Fittings 3, 4 for loading powdered material and discharging granules. Inside the case there is a rotating shaft 5, equipped with radial rods 6. The ends of three adjacent rods 6 are located at the vertices of isosceles triangles, the sides of which have a certain dimension. The base of the triangle, parallel to the axis of the shaft 5S is equal to 3-5 diameters of the rods, and its sides are 3-15 diameters of the rods 6,

Pellet torus works as follows.

The powder through the nozzle J and the binder through the nozzles 2 is simultaneously fed into the housing 1. Powdered particles under the action of the rotating rods are pressed against the inner surface of the housing and move with a thin rarefied layer to the discharge nozzle 4. In the process of high-speed movement of the rods in the layer on both sides of each rod are created oppositely directed flows of a three-phase medium (gas — solid particles — particles of a liquid) with a high degree of turbulence.

The streams discharged from two adjacent rods merge and re-dissect the subsequent rod into two streams, and the pattern of movement dynamics repeats. The installation parameters of the rods ensure that, at any point in the layer, high touring is maintained, due to which the binder is quickly and evenly distributed between the powder particles and the subsequent uniform growth of the granules. Under movement, the granules acquire the required density, shape, and size of BiGruAgpots through

ten

AND

70

five

0

five

Q

five

0

five

ry and so on, choke 4.

In order to experimentally check the performance of the proposed granulator and compare the obtained results with the indicators of the known granulator, a series of experiments on granulating sodium tripolyphosphate powder using sodium tripolyphosphate solution in water is used as a binder.

The experiments were carried out with the following constant parameters, the content of the binding element in the granulated mixture was 20%, the flow rate of the granulated mixture was 70 kg / h, the rotational speed of the working member was 1500 rpm, the inner diameter of the body was 120 mm, and the length was 420 mm. rod diameter 5 mm, 10 mcm 15 mm, distance a between the rods along the axis of the granulator and the side h of an isosceles triangle, which forms any three adjacent vertices of the rods. The values a and h are proportional to the diameter of the rod. The function of the response is the magnitude of the yield of the product fraction in the finished product with the size of the granules of the product fraction of 0.2-2.0 mm

The results of the experiments are given in table. 1-4, In the first series of experiments (Tables 1-3}, the change in the diameter of the rod is carried out simultaneously with the change in the values of a and h proportional to the diameter of the rod, leaving the proportionality coefficients unchanged for all rods x.

In the second series, experiments are carried out on the well-known model. In this case, the constant parameters are chosen the same as in the first series5 and the variable parameters are the location of the rods in the known granulator.

The studies performed show jJKj that there exists a region of a combination of design parameters of the granulator (distance between the vertices of the rods along the axis of the granulator and the side of an isosceles triangle, which is formed by the free ends of any neighboring rods, at which a significant increase in the yield of the finished product is possible) „

Thus, with a () d and h - () d, the yield of the product fraction is 75.3-87.6%, which is 28.7-40.5% higher.

515

than with a less 3d and h less 3d and 20.7-21.8% higher than with a more 3d and h more 15d and significantly higher than that of the prototype (Table 4).

Thus, due to the indicated distances between the tops of the rods, an increase in the uniformity of the particle size distribution of the product fraction is achieved.

Claims (1)

Invention Formula The granulator containing a cylindrical housing with fittings for the supply of powdered material and St. 61896 rotary shaft with radial cylindrical rods, characterized in that, in order to improve the quality of the obtained pellets, the ends of three adjacent rods are located at the vertices of isosceles triangles, while the distance between the rods 0 forming a shaft parallel to the shaft axis the triangle is 3-5 rod diameters, and the distance between the rods on the side of the triangle is 3-15 rod diameters. Note The output of marketable products,%, when h is equal to Mm note The output of marketable products,%, when h is equal to Note Table 2 Table 3 4.69.2 21,145,2 ∆n, d 10 mm Table 4 10.3 12.5 43.6 36.6 18.8 2.6 7.8 87.1 FIG. 2