Procedure for granulating dispersed mediums on plate granulator

FIELD: machine building.

SUBSTANCE: granulation is carried out in two stages; first stage is humidification with binding performed to humidity 40-70 % of optimal humidity of mixture. Also, the first stage is combined with simultaneous granulation generating centres of granules formation; the centres are further introduced to area of a plate surface corresponding to 50-80 % of its total area. The second stage is granulation performed at rate exceeding critical velocity of plate rotation. Ratio of area of binding spray in contact zone to material is 0.4-0.7 of working surface of the plate. Angle of ascent of material on periphery region relative to surface of the plate bottom equals to 3-10°.

EFFECT: increased efficiency of granulator, of strength of granules and increased uniformity of granulometric composition of product.

1 tbl

 

The invention relates to the technique of granulation granular, fine and dust-like materials and, in particular, can be used for granulation of fertilizers, animal feed and biologically active preparations.

There is a method of granulation by washing, by which powdered product through the loading fitting is served on an inclined rotating plate, where he moistened binder liquid (e.g. water) from nozzles and ukutyvaemsya to pellets of a given size. Granules, located on the rotary plate, act the force of gravity, centrifugal force and friction force. During the rotation of the tilted plate due to the action of centrifugal force and friction force of the granules are pressed against side and bottom of the plate and rise 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.

The process of granulometry in the General case as follows. Dispersible water additionally crushed on the layer of material. Due to forces of surface tension and capillary pressure of a moving liquid film material particles are drawn together and form the primary agglomerates. Under the action of forces in the moving layer of material agglomerates tend to adopt a spherical shape. The size of the primary AG is Muratov is determined by the size of the water drops within the layer of material. Most of these agglomerates is close to each other, and they are partially connected by water films. When moving moist agglomerate excess moisture is squeezed out to the surface, and the structure of the granules becomes more dense. Under the action of centrifugal forces arising from the rotation of the granulator, and the forces of surface tension of the liquid film of small agglomerates grow larger and, under certain conditions, become nuclei (sources granulometry). In the future anhydride (dry) particles accumulate on the moistened particles of retur. If the size dispersible drops large particles are formed internal retur 3-5 mm in diameter, but the mechanism for the enlargement of the granules remains the same. Further, the seal structure of the granules occurs in dense dynamic layers due to the forces of interaction between them (Pavlasek, Iggeres, Iphoen. Granulation. M.: Chemistry, 1991, 240 S.).

The disadvantage of this method is the strict regulation of the process of granulation on the angular velocity of rotation of the plate ω, the angle α, the place of supply of the binder and writing material. There is a critical angular velocity or rotational speed of the plate n, in which there are large centrifugal force presses the layer of particles of the Board plate and preventing rolling of particles down. In this case, for the operation of the granulator increase the angle of inclination of the plate to the horizon. The critical frequency of rotation of the plate is determined by the dependencies:

,

where φ0- the angle of repose of the material, DT- the diameter of the plate.

As the critical speed depends on many factors, in practice, for each material, this speed is determined experimentally.

At speeds less than the critical optimal mode when the separation of fines from the side of the rotating plate is at the top of their ascent on the surface of the pellet. In this case, is effectively used half or slightly more than half of the bottom area of the plate. There is a limit of the angle of the plate α=45-55°, which is also determined by the material properties and the desired granule size.

In addition, the disadvantages of this method are the limited areas of natural roll-off, low utilization ratio of the volume of the plate and wide particle size distribution of the finished product.

A known method for the production of granular fertilizers, including the dosing of fine-grained materials, mixing, wetting and granulating by washing with or without additives them in a drum or disc granulator (EN 2084276, C1-6 01J 2/14, 2/28, 1995). In kachestvennoi phase when the granulation is used for water extraction of soluble components from the same fertilizer at a temperature of 80-90°C. Of particles with micron size receive granules size 1-4 mm due to the introduction of aqueous extract soluble components of these fertilizers increased nutrient content and strength of granules due to crystallization put them in salt. The disadvantages of this method are the need to introduce more energy-intensive operations water extraction of soluble components, the high sensitivity of the process to the dispersion of the spray binder, a wide particle size distribution of the obtained granules and low productivity of the granulator. In addition, the heating temperature of the binder 80-90°C does not allow granulation thermolabile products (e.g., enzyme products, premixes and certain components of animal feed).

Closest to the proposed invention is a method for the granulation of fine materials on the plate granulator, including batching, mixing, followed by wetting with a binder and granulating the balling on a rotating inclined plate with simultaneous wetting by spraying a binder (EN 2082491, C1-6 01J 2/14, 1994). By a known method on the plate granulator serves hydrated material, and before filing in the process of mixing to the mixture embryonic particle fraction 5 are 300 μm in the number of the e 25-30% of the volume of the material. The best results in performance and composition (dEQ=10-20 mm) is achieved when the diameter of the plate 0.7 m, the tilt angle α=55°, and the rotational speed n=22 min-1. From the description of the application, it follows that the hydration of fine material when mixed with Securom lead to a moisture content of 10-25%, and granulating the mixture is carried out in 5 minutes with additional hydration 2-5%.

The disadvantages of this method are the use of large external rature (for example, marble chips), enter a limited amount of binding that does not allow you to pelletize fine powders to obtain granules with a narrow particle size distribution. In this way it is impossible to pelletize fine enzyme preparations and premixes with low bulk density.

An object of the invention is to increase the capacity of the pellet mill, the durability of the pellets produced from fine materials and granular media, as well as improving the uniformity of the particle size distribution of the product. This technical result is achieved by using a combination of essential features that characterize the proposed method for the granulation of multicomponent, polydisperse materials on plate granulator.

The essence of the invention consists in that is, a method for pelletizing particulate materials, including batching, mixing, followed by wetting with a binder and granulating the balling on a rotating inclined plate with simultaneous wetting by spraying a binder, added the following operations with the changed regime parameters. Granulation is carried out in two stages, with stage wetting with a binder hold up to humidity 40-70% of the optimum moisture content of the mixture and combine with simultaneous preliminary granulation with reception centers granulometry and the subsequent entry of these centers on the surface area of the plate which constitutes 50-80% of its total surface. Further granulation carried out with the speed of rotation of the plate in excess of the critical speed. Thus the ratio of the area of the spray binder in the zone of contact with the material is 0.4 to 0.7 of the working surface of the bottom of the plate, and the angle of elevation of the material on the peripheral area relative to the bottom surface of the plate is 3-10°.

The claimed method allows you to pelletize as fine powders (dEQ=5-30 μm), and a granular mixture with a particle size of 3-5 mm Granulation is carried out centers granulometry obtained by hydration of the source material in regranulate. When declared gimnich parameters is formed 70-90% of microgranules downloadable from the mixture. When applying to the plate and radial movement on its surface is the simultaneous growth and compaction of a larger number of granules. The use of a significant part of the working surface of the bottom of the plate, the greater the specific gravity and surface irrigation binding of moving granules and high speeds of movement of the particles through the spray granulation process is more intense. As a result, increase the utilization ratio of the volume of the pellet mill, the specific output of the conditional commodity faction narrow particle size distribution. The optimal ratio between the quantities of binder, supplied with moisture in regranulate and graining on the plate, with high sealing loads also provides robust granules.

Thus, when the aggregate of the stated essential features provided the stated purpose.

Below is an example implementation of the claimed method of granulation of fine-grained materials. As source material used powdered enzyme preparation Glycolax F with an average particle size of dEQ=5 μm. Granulation was carried out as follows. As a binder used water and a solution of polyvinylpyrrolidone. The initial mixture was moistened and simultaneously granuloma and in the mixer frame type moisture W CR=12-40%. This humidity was 40-70% of the optimum moisture content of the mixture before drying. Then a mixture consisting mainly of microgranules (centers granulometry), were loaded on the disc granulator, and then carried out the process of granulation, introducing additional binder in the amount of 7-20%. After obtaining pellets of a given size 1-3 mm and the mixture was unloaded, then was dried and determined the particle size distribution by sieving method on the sieve, and the granules. The table shows the results of laboratory studies of the process of granulation on the plate granulator with DT=350 mm, depending on operating parameters of the process.

From the table it is seen that when the claimed ratios of process indicators minimal marketable fractions and pellet durability are achieved in experiments No. 1 and No. 4.

Maximum data output commodity fraction (91 and 93%), performance (9.3 and 9.6 kg/h), the strength of granules (0.18 and 0.25 MPa) and uniformity (coefficient of variation of 0.42 and 0.36) achieved in experiments # 2 and # 3, respectively. When this maximum is used, the working surface and the volume of the plate (60 and 80%). Also conducted experiments with modal parameters of the prototype (No. 5), the worst performance in comparison with the claimed method.

The proposed method for granulating fine and ernesti materials can be applied by granulation enzyme preparations, compound feeds, premixes, and waste disposal beer production (dried brewer's grain).

Table
No.Process indicators granulationNumbers of experiments according to the invention
1234The placeholder
1Performance on the initial mixture G, kg/h8,09,39,6105
2The amount of binder applied to regranulates, % of Optim. humidity4050657075
3The moisture content of the mixture after regranulate Wnp, wt.%1217,726,237,512
4The amount of binder applied to the plate WT, wt.%1818147,54
5The moisture content of the pellets before drying W, wt.%3035,740,24516
6The working surface of the bottom plate, % of the total surface5060807550
7The angle of the plate α, deg.4042485055
8The frequency of rotation of the plate n, R/min3750626730
9The area of the spray binder is about, in fractions from the working surface of the floor plate0,40,60,70,80,5
10Output of marketable fractions (1-3 mm), %7591938770
11The equivalent diameter,dEQmm1,82,12,22,01,4
12The coefficient of variation of the distribution of granule size, V %5342364475
13The strength of the dried granules σSG, MPa0,160,180.250,20,15
14The angle of elevation of the material, hail.3 68102

Method of granulating dispersion media, disc granulator, including batching, mixing, followed by wetting with a binder and granulating by rolling on a rotating inclined plate with simultaneous wetting by spraying a binder, characterized in that the granulation is carried out in two stages, the stage of wetting with a binder hold up to humidity 40-70% of the optimum moisture content of the mixture with simultaneous preliminary granulation with reception centers granulometry, and subsequent input received microgranules on the surface area of the plate, comprising 50-80% of the total surface, and granulation carried out at a speed exceeding the critical speed of rotation of the plate, while the ratio of the area of the spray binder in the area of contact with the material is 0.4 to 0.7 of the working surface of the plate, and the angle of elevation of the material on the peripheral area relative to the bottom surface of the plate is equal to 3-10°.



 

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