SU733728A1 - Plant for granulating and drying paste-like materials - Google Patents

Description

one

The invention relates to the medical industry and may find application in the chemical, food and other industries.

A granulation and drying installation is known, consisting of a separation chamber with a gas outlet, a granulator located therein, a fluidized bed dryer with gas distribution grids, a cyclone and a ventilation system 1.

However, such an installation may be applied for drug masses containing on the order of 5-30%. . moisture, and its application for paste-like preparations with a moisture content of 7585% is not possible, since no materials are pushed through the granulator, because it smears the holes in the lattice and does not form granules, so that the material does not flow into the sushi chamber. Separate drops, which fall into the drying chamber, do not have time to dry out. In the vertical part of the dryer and, falling on the gas distribution grid, cover it and break

hydrodynamic fluidization,

The aim of the invention is to obtain granules from a pasty

5 material of high humidity. The goal is achieved by the fact that in the proposed installation the separation chamber consists of two parts: the lower and the upper, and the pellet torus is filled in the form of a rotatable drum, on the surface of which annular grooves are made, and equipped with a comb in the form of a comb. is located at a distance equal to 0.10, 5 of the diameter of the granulator, from the section of the upper and lower parts of the separation chamber, and the ratio between the length of the granulator and the vertical part of the dryer is 0.5-1.2.

the annular grooves in the cross section have a trapezoidal shape, and the hole for; gas exhaust is located

25 in the side wall of the upper part of the separation chamber at a distance of 0.5–1.0 diameters of the granulator from its axis and 0.25–0, b of the length of the transulator from the vertical axis of the separation chamber.

None of FIG. 1 is a diagram of the device to be installed. FIG. 2 is a drum section; in fig. 3 shows section A-A in FIG. 2,

The plant for granulating and drying pasty materials consists of a separation chamber 1 with a hole 2 for exhausting gas located in the granulator 3 located in it, from a boiling bed 4, with gas distribution grids 5, a cyclone 6 and a ventilation system 7, the separation chamber 1 from two parts - the lower and upper, and the granulator 3 is made in the form of a rotary drum 8, on the surface of which ring grooves 9 are made, and provided with a skrak 10 in the form of a comb.

The installation works as follows.

Heating of the granulator 3 is turned on, after reaching a predetermined temperature on the surface of the granulator 3, the wet mass is loaded into the receiving bin 11, and from it the gravity of the rotating granulator 3 flows by gravity.

During the rotation from the loading point to the unloading point, the mass in the grooves dries out (about 15-20% of moisture is removed) and is removed from them by the scraper 10. The formed irregular-shaped granules are fed into the drying chamber, where, from the bottom upwards, the flow of drying agent supplied fan 12 and heated to a predetermined temperature in the colorplate 13, as well as subjected to treatment with a radiant flux from the outer walls, dry up and, falling into the fluidized bed, are finally completely dried. The drying agent is air.

The vertical part of the apparatus serves not only to remove a certain amount of moisture, but also to filter. The shallow fraction formed in the fluidized bed encounters sufficiently wet granules in the vertical part of the apparatus, settles on them and significantly reduces entrainment. After the vertical part, the dusty stream enters the separation chamber 1, where the air velocity decreases, a fraction of the dried material falls out and falls on the chamber walls. This same air flow, meeting on its way the resistance in the form of a drum 8, moves away from it and changes its direction of movement, around the drum 8 by. lateral surfaces and ends. Moreover, the fine fraction of the material in the air partially settles on the surface of the wet material.

The speed of air flowing around the drum 8 on the side surfaces

and the ends, due to the reduction of the living section, increase by 2-3 times, thereby increasing the heat transfer between the wet material on the drum surface and the exhaust air.

The end of the drum at the rectangular wall of the separation chamber 1, due to the increased air velocities, is cleared of adherent material particles.

 The air, entering the upper separation chamber, dramatically changes the trajectory of movement and, due to the expansion of the chamber, reduces the speed, so that the remaining small

5, a fraction of the material falls into the wet material located at the top of the drum. Purified air enters the outlet zone. Part of the material deposited on the side surfaces of the walls, due to the selected angle of repose, flows down and again falls into the stream. exhaust air.

Due to such organization of hydrodynamics, it was possible to use up to 20–35% of the heat of exhaust gases (gas temperature is 30–50) and reduce entrainment to the cyclone to 50%. From the cyclone, the small fraction enters the receiving

cyclone hopper 14 6.

The dried granular material in the form of pellets is continuously unloaded by the turnstile into a hopper 14.

Claims (2)

Invention Formula An installation for granulating and sucking pasty materials, consisting of a separation chamber with an opening for evacuating gases, a granulator in it, a fluidized bed dryer with gas distribution grids, a cyclone and a ventilation system 5, characterized in that in order to obtain granules from a pasty material of high humidity, the separation chamber consists of two CQ parts are lower and upper, and the granulator is made in the form of a rotatable drum, on the surface of which annular grooves are made, and equipped with a comb in the form of a comb, while the axis of the granulator located at a distance equal to 0.1-0.5 diameters of the granulator, from the section of the upper and lower parts of the separation chamber, and the ratio between the length of the granulator and the vertical part of the dryer is 0.5-1.2, 2. Installing pop, 1, in contrast to the fact that the annular grooves in the cross section have trapezoid5 NY.