SU1586757A1 - Arrangement for granulating pulverulent mineral fertilizers - Google Patents

Abstract

The invention relates to the class of rotary drum type granulators and allows to increase the reliability of the device operation by reducing the dynamic effects on the granulated material from the retaining element and the inner surface of the drum. This is achieved by the fact that the retaining element of the granulator is made with the possibility of radial and circumferential movements relative to the inner surface of the drum, which creates conditions for its self-centering in the layer of the material being processed. 2 Il.

Description

This invention relates to granulating powdered materials, namely granulators, such as rotating drums.

The aim of the invention is to increase the reliability of the device by reducing the dynamic effects on the granulating material from the retaining element and the inner surface of the drum.

Figure 1 shows a device with a cylindrical shape of a rolling drum, a longitudinal section; in fig. 2 - the same, side view.

The housing 1 of the device rests on the rollers 2 through the bandages 3. At the entrance end of the housing there are inclined

chute 4 for injecting the powder component and conduit 5 for feeding the binder component, and a retaining ring 6 at the discharge end. Inside the case there is a retaining element 7 connected to the rod 8 with the HELP of the brackets 9 which move relative to each other It is possible to install springs .. 10 in a non-deformed state, ensuring the calculated position of the retaining element in the layer of the material being processed as during operation of the device in the presence of granulated mixture in it and in the start stage, when the particulate material is not yet fed

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 case. The rod 8 has the freedom of rotational movement in the supports of the fixed struts 11. The end of the movable rod is equipped with a lever 12, on which a counterweight 13 can be mounted on various positions.

The device works as follows.

i When the housing 1 rotates, a powdered component is continuously fed through it through a chute 4, and a liquid component is introduced through pipe 5 to uniformly irrigate the surface of the powder. When a granulated mixture is poured, granules form. / Moving in a layer of pouring and subjected to dynamic action on the side of other particles of the material being processed, they gradually increase in size and reach the discharge end of the body 1 of the granulator. The retaining ring 6 allows you to create the required degree of filling with a granulated mixture of the working volume of the body of the granulator. The retaining element 7, located in the central part of the pouring layer, changes the trajectory of the particles of the small fraction, directs them to the zone of the most intensive rolling,

In the central zone of the transfer layer, the dynamic interactions between the particles of the material being processed and, consequently, between the material being processed and the supporting element are minimal. The retaining element tends to be retained in the central zone of the layer of the material being processed, and the proposed device allows the retaining element to self-center in the zone of concentration of the main mass of the fines and prevent its attachments from breaking if the granulator fails. When changing the technological parameters of the granulation process, leading to a displacement of the center of the layer of transferring the processed material, and hence the zone of concentration of the main mass of the fine fraction both in the circumferential and in the radial directions relative to the drum of the granulator, the retaining element having freedom of movement in these directions, it will perform self-centering, thus ensuring optimal conditions for rolling

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granulated material. When a granulator is disrupted (a case of overwetting of the granulated mixture), when the material being processed goes from a loose to a pasty state and dynamic effects from the material on the retaining element increase sharply, the retaining element, having freedom of movement in the circumferential direction, is displaced from the material layer in the direction of rotation of the drum. With the normalization of the physicomechanical properties of the layer of the material being processed, the retaining element under the action of its own gravity force returns to its original position.

The presence of the counterweight 13 in the corresponding position on the lever 12 of the movable rod 8 allows the retaining element 7 to be installed in the initial calculated and equilibrium position inside the housing 1,

The use of a retaining element with circumferential and radial {1st movements relative to the inner surface of the drum creates conditions for its self-centering in the layer of the material being processed, which reduces the dynamic effects of the retaining element on the granulated material when the hydrodynamics of the material transfer layer are changed, and also increases the reliability of the unit in case of disruption of the process of granulation due to the overwetting of the granulated mixture, excluding the possible breakdowns of attachment molecular element.

Claims (1)

Formula A device for granulating powdered t-shnerapne fertilizers j including a rotating drum with means for loading powdered materials and loading granules, a retaining element installed at the bottom of the drum, characterized in that, in order to increase the reliability of the device by changing the dynamic effects from the retaining element granulated material, retaining element made with the possibility of radial and circumferential movements relative to the inner surface of the drum.  T: 7