Disc granulator

 

(57) Abstract:

The invention relates to devices for granulating materials and can be used in chemical and other industries, for example, to produce fertilizer from the group consisting of urea, nitrate and ammonium phosphate. Disc granulator includes a housing with a cover, which is installed with the possibility of rotation of the inclined plate, drive plate, loading and unloading spouts, nozzles and separating device. According to the invention, in the disc pelletizer additionally introduced regulating plate and a table-knife, the regulating plate ustanovlena in the plate perpendicular to and gap = 25 - 35 mm relative to the bottom of the plate, a table-knife is mounted so that the edge of the blade parallel to the plane of the bottom of the plate and oriented towards the rotation of the plate,a separator made of rods parallel to the bottom of the plate with a uniform gap between them in the form of a comb perpendicular to the bottom of the plate regulating plate, a separator and a table-knife are located respectively in the zones between 12 - 2 h, 3 to 5 h and 8 - 11 h under the condition of rotation of the plate counterclockwise and fixed on the cover is>the bottom of the plate with the vertex of the angle on the edge, and the bars separating device placed satrom 2,5 - 3 mm 2 C.p. f-crystals, 4 Il.

The invention relates to devices for granulating materials and can be used in chemical and other industries, for example, to produce fertilizer from the group consisting of urea, nitrate and ammonium phosphate.

On the plate granulator, the granules othermovies by spraying the liquid phase into small solid particles, called Retour entered on a rotating inclined plate.

Granulometrie plate granulator has its own characteristics that are associated with a significant amount of centrifugal forces, in developing these machines. Granules, located on the rotary plate, the force of gravity, centrifugal force and friction force. Due to the action of centrifugal force and friction force, the granules are pressed to the bottom of the plate and rise with him to a certain height, and then under the action of gravity to slide down the bottom down. The shape of the trajectory of the pellet approaches the spiral.

As the granules increase in size, they gradually moved into the layer of VVER is P> The mass of the rotating material layer is unevenly distributed across the surface of the plate. The greatest amount of material is on the side of the plate, moving upward where the granules are crashing over the side of the plate. Here, in a direction opposite to the lifting movement of the plate, there is a continuous setiausaha action, the so-called area of natural rolling or zone of active growth of the granules, because it is in this area try to be coated granules. The increase in the area of natural rolling granules parameters of the granulator (speed, angle, diameter and height of the plate) is limited to the specific yield and quality of the finished product. In the limited areas of natural rolling utilization of the volume of the pellet mill low. This is the main disadvantage disc granulators.

Known plate granulator containing an inclined plate with rim, drive plate, loading and unloading spouts and nozzles (p. USSR N 873867 B J OI 2/14, 1974). In the specified plate granulator nozzles installed in such a way as to significantly warm the growth zone was formed on the surface layer in the portion of the plate, where moving over to the AI of the plate clockwise.

As mentioned plate granulator growth of granules occurs only in part of the area's natural roll-off, the utilization ratio of the volume of the pellet mill low. In addition, unloading fall granules wide fractional composition.

Known disc pelletizer, comprising a housing with a cover, which is installed with the possibility of rotation of the inclined plate, drive plate, loading and unloading spouts, nozzles and separating device.with.USSR N 1517995 B J OI 2/14, 1987).

Separator specified disc granulator is made in the side of the plate with perforation and two arc plates covering the Board plate and forming the flow area in the zone 1-6 h when you rotate the plate counterclockwise, and installed in the ability to move along the side of the plate. The formed pellets are crashing over the side of the plate only in the place where the arc plates form the flow area, and particles smaller diameter perforations pass through holes in the Board and output via an additional pipe. Due to the relative movement of the arc plates changes the position and size of the orifice discharge of the finished product, Thu the SPS more narrow fractional composition.

However, in this plate granulator rapid growth of the granules occurs only in the area of natural rolling of the pellets, i.e., the utilization ratio of the volume of disc granulator low.

In addition, the removal of the fine fraction separating the device from the granulator reduces the specific yield.

The objective of this invention is to provide a disc granulator, in which due form, placement and maintenance of new design elements increased utilization of the volume of the pellet, thus increasing the specific output of finished products, ensuring its high quality.

The problem is solved as follows.

In the known disc pelletizer, comprising a housing with a cover, which is installed with the possibility of rotation of the inclined plate, drive plate, loading and unloading spouts, nozzles and separating device, inputs of the regulating plate and the table-knife, the regulating plate is installed in the plate perpendicular to and gap 25-35 mm relative to the bottom of the plate, a table-knife is mounted so that the edge of the blade parallel to the plane of the bottom and is focused on the gap between them in the form of a comb perpendicular to the bottom of the plate, regulating plate, a separator and a table-knife are located respectively in the zones between 12-2 h 3-5 h and 8-11 h under the condition of rotation of the plate counterclockwise and fixed on the cover, with the nozzle placed in the areas between 1-5 h and 8-11 hours At this table-knife angle is 2-3othe bottom of the plate with the vertex of the angle on the edge. In addition, the bars separating device is placed with a gap of 2.5-3 mm.

In the inventive plate granulator along with the natural rolling of the pellets creates an additional effect on granule for their active rolling. In addition, ensure the timely removal of the pellet pellets have reached the desired size. This allows you to create secondary zones, active roll, and, consequently, the growth of granules and better use for the growth of granules zone natural roll-off.

The gap between the regulating plate and the bottom plate selected from those considerations that when the gap is less than 25 mm, the number of granules that fall on the table-knife a little and melt from the nozzle will be to get on a plane of a table-knife, which is undesirable. If the gap is more than 35 mm on the table-knife gets a thick layer of granules, in which is movably what Asa to the formation of agglomerates of the type "raspberry".

The establishment of a table-knife at an angle of 2-3othe bottom of the plate with the vertex of the angle on the edge provides free passage of those granules that during operation of the pellet mill could hide under the table-knife.

The gap between the bars separating device 2.5-3 mm is determined by the requirements to the size of the granules of the finished product. So, for example, ammonium nitrate according to GOST 2-75, to reduce caking of fertilizers preferably the content of the pellets 3-2 mm not less than 50%

Thus, the proposed set of features, ceteris paribus (the parameters of the pellet) in the inventive granulator allows the simultaneous growth of a larger number of granules, therefore, the utilization ratio of the volume of the pellet is higher, which increases the specific yield while ensuring its high quality.

In Fig. 1 shows a plate granulator, General view, section I-I of Fig. 2 disc granulator, a General top view of Fig. 3 regulating plate, the section II-II of Fig. 4 separating device, the section III-III.

Disc granulator includes an inclined plate 1 of diameter D depth H, radius R and angle to the horizon pamesan the cuttings 5 to enter reture, the nozzle 6, the regulating plate 7 fixed to the cover 3 of the housing 2 and perpendicular to the gap d 25-35 mm relative to the bottom plate 1, a table-knife 8, mounted on the cover 3 of the housing 2 counters 0 and separating device 10. Table-knife 8 is mounted so that the edge of the blade 11 is parallel to the plane of the bottom of the plate 1 and are directed towards the rotation of the plate 1 at an angle 203othe bottom of the plate 1 with the vertex angle of the blade 11. Between the blade 11 and the plane of the bottom of the plate 1 there is a small gap to allow the free sliding of the table-knife 8 on the bottom of the plate 1 without scoring.

Separator 10 is made of rods parallel to the bottom plate 1 with a uniform gap between them in the form of combs mounted on the cover 3 of the housing 2 perpendicular to the bottom plate 1. The bars separating device 10 is placed relative to each other with a gap of 2.5-3 mm.

When conditional consideration of plate 1 in the form of hours (Fig. 2) regulating plate 7, a separating device 10 and a table-knife 8 are respectively in the zones between 12-2 h 3-5 h and 8-11 h under the condition of rotation of the plate counterclockwise, and the nozzle 6 are placed in zones 12 and 13 between 1-5 h and 8-11 PM

In Fig. 2 also noted area 14 supply reture, zone 15 conditional is clockwise all the described positions will be mirrored about the axis, passing through the 12 and 6 o'clock

Disc granulator operates as follows.

Inclined plate 1 mounted in a housing 2 with a lid 3 is driven in rotation by the actuator counterclockwise with a given angular velocity w

Through the feeding pipe 5 into the zone 14 is injected recur, for example, melkorazdroblennuyu granules of ammonium nitrate.

As a result of granules located on an inclined rotating plate 1, gravity, centrifugal force and friction force, they get complex movement (schematic line 16) around the zone 15 of the conventional center segregation of granules.

Lifting together with the rotating plate 1, some of the granules, in which the force of gravity overcomes the force of friction, sliding down the surface layer (a natural rolling), some of the granules is reflected by the regulating plate 7, and some of the granules pass through the gap between the control plate 7 and the bottom of the plate 1.

Actively rolling, as due to the natural roll-off, and by reflection from the plate 7, the granules are coated in the liquid phase, for example, a melt of ammonium nitrate through a nozzle 6, is placed in zone 13.

The granules are passed through the gap between the street and served on the table-knife 8, mounted on the cover 3 on the rack 9. Rolling on the table-knife 8, the granules are subjected to spraying through a nozzle 6 in the zone 12.

Along with the growth of granules that have reached the desired size, due to centrifugal forces rolled over the side of the plate 1 in the discharge pipe 4 and are derived from the disc granulator for further processing.

Unloading of the finished granules also contributes to the separation device 10, which passes through only the granules less than 2.5-3 mm in accordance with the gap between the parallel bars of the comb separating device 10.

The granules are passed through a separating device 10, moving up together with the rotating plate 1, and the described cycle is repeated until then, until the granulator.

Thus, due to more efficient use of the volume of the pellet at the same time the growth process is subjected to a greater number of granules, i.e., increasing the specific output of finished products and this ensures its high quality.

1. The disc pelletizer, comprising a housing with a cover, which is installed with the possibility of rotation of the inclined plate, drive plate, boot, razgruzit latina and a table-knife, the regulating plate is installed in the plate perpendicular to and with a gap of 25 to 35 mm relative to the bottom of the plate, a table-knife is mounted so that the edge of the blade parallel to the plane of the bottom of the plate and oriented towards the rotation of the plate, a separator made of rods parallel to the bottom of the plate with a uniform gap between them in the form of a comb perpendicular to the bottom of the plate regulating plate, a separator and a table-knife are located respectively in the zones between 12 and 2 h 3 5 h and 8 to 11 hours under the condition of rotation of the plate counterclockwise and fixed on the housing cover, when this nozzle is placed in the areas between 1 to 3 hours and 8 11 o'clock

2. Granulator under item 1, characterized in that the table-knife angle is 2 3oto the bottom of the plate with the vertex of the angle on the edge.

3. Granulator under item 1, characterized in that the bars separating device is placed with a gap of 2.5 to 3 mm.

 

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