SU985647A1 - Spray dryer for liquid products in fluidized bed of inert bodies - Google Patents

Description

The invention relates to techniques for drying liquid products and can be used in food, pharmaceutical, chemical and other industries.

Known spray dryer, for solutions and suspensions, in a fluidized bed of inert bodies, containing a housing with a gas distribution grill, pao | Q dust atomizer of a liquid product and a tedder located above the grill [1].

The disadvantage of this dryer is the low intensity of mixing of inert bodies.

Also known is a spray dryer for liquid products in a fluidized bed of inert bodies, comprising a casing with a gas distribution grid and located above the grate in a layer of inert bodies, an agitator with a drive and a rotor rotor located above the agitator C 2].

The disadvantage of this dryer is the inefficient organization of mixing inert bodies and seed crystals to form granules, which reduces the intensity of heat and mass transfer and granule formation.

The purpose of the invention is the intensification of heat and mass transfer and granule formation.

This goal is achieved by the fact that the rotor is made in the form of a pair of shafts mounted for rotation in opposite directions, and the rotor blades are made of screw with multidirectional winding at opposite ends of the shafts, while the agitator is equipped with a rotating blade.

In addition, the rotating agitator blade is kinematically connected 15 with its drive.

In FIG. 1 schematically shows the proposed dryer, a vertical section; nafig. 2 is a section AA in FIG. 1; in FIG. 3 - section BB in FIG. 2; in FIG. 4 is a section BB of FIG. 1.

The dryer contains a conical housing 1, a gas distribution grill 2, an air duct 3 for supplying heated 25 air, an agitator 4 mounted on a shaft 5, which is driven by a drive 6. A collector 7 is installed in the housing 1 with nozzles 30 arranged around the circumference of the agitator blades 4 <· Wives screw rotors 9 with right a and left b winding, driven into rotation by drive 10 through gears,

11, An unloading window is located above the gas distribution grill 2

12 provided with an adjustable gate 13;

The agitator .4 comprises an obliquely positioned streamlined stationary blade 14 having bearings 15 in which the blade 16 rotates, on the axis of which the bevel gear 17 is rigidly fixed, which is engaged with the bevel gear 18 which is fixedly mounted on the support 18.

The dryer operates as follows

A layer of seed crystals is poured onto the gas distribution grid 2. Heated air is supplied through the duct 3 under the grill 2 under pressure. Drive 6 is turned on. swivels the agitator

4. When the agitator 4 rotates, the bevel gear 17, which is meshed with the stationary gear 19, rotates together with the blade 16 in the bearings 15 relative to the blade 14, while the crystals (granules) are effectively mixed. The blade 14 rakes up the granules placed in a fluidized bed, and the blade 16 during their rotation effectively mixes them, contributing to better heat and mass transfer. A liquid product is supplied through collector 7, for example, a sugar or sorbitol solution, which is sprayed through nozzles 8 to a finely dispersed state ¹ and sprayed onto 14 crystal crystals blown.

In the drying process, the seed crystals are pulled by the product with the growth of granules on the grate 2. As the layer reaches a certain height, regulated by the gate 13, the granules are unloaded through the window 12. In this case, the seed crystals are replaced by the granules formed. In the future, fragments of the granules formed serve as new crystallization centers.

When the liquid product is fed through the nozzles 8, the '15 mixing layer 16 is turned on at the same time as the seed drive 40, which drives the screw rotors 9, which rotate in the opposite directions due to the gears 11. Screw rotors 9 are immersed in a layer of granules. During the rotation of the screw blades due to the presence of the right a and left bows, the crystals are captured, moved to the center under the axis of the nozzle 8 and thrown out by the blades with a fan into the cone of the spray torch. With this directional spreading of crystals (granules) into the torch of the dispersed liquid product, the dispersed liquid is effectively enveloped granules supplied by the nozzle 8 product by increasing the contact surface of the granules in suspension in the pacntina torch, which accelerates the formation of granules.

Claims (2)

The invention relates to a technique for drying liquid products and can be used in the food, pharmaceutical, chemical and other industries. A well-known spray dryer for solutions and suspensions in a fluidized bed of inert bodies, comprising a housing with a gas distribution grid, a liquid dispenser product and agitator 1J located above the grate. The disadvantage of this dryer is the low mixing intensity of the inert bodies. A spray dryer for liquid products in a fluidized bed of inert bodies is also known, comprising a housing with a gas distribution grill and disposed ngsh grille in a layer of inert bodies, a powered agitator and a paddle rotor placed above the C2. The disadvantage of this dryer is inefficient organization of mixing of inert bodies and seed crystals for the formation of granules, which reduces the intensity of the processes of heat and mass transfer and granulation. The purpose of the invention is the intensification of heat and mass transfer and granulo formation processes. The goal is achieved by the fact that the rotor is made in the whole of a pair of shafts mounted rotatably in opposite directions, and the rotor blades are screwed with multidirectional winding at opposite ends of the shafts, while the agitator is equipped with a rotating blade. In addition, the rotating blade of the agitators is kinematically associated with its drive. FIG. 1 schematically an isobrgynea proposed dryer, vertical section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 2; in fig. 4 shows a section B-B in FIG. 1. The dryer contains a conical housing 1, a gas distribution grid 2, an air duct 3 for supplying heated air, a turner 4 mounted on the shaft 5, which is driven by the drive 6. In the housing 1 a collector 7 is installed with circumferential nozzles 8- Above the blades The rotator 4 is equipped with screw rotors 9 with right a and left winding, driven by the drive 10 through gears 11, Discharge box 12 is located above the gas distribution grid 2 and equipped with an adjustable gate. The rotator .4 has an inclination onion located streamlined stationary blade 14, having supports 15, in which the blade 16 rotates, on the axis of which a bevel gear 17 is fixed, which is in engagement with a bevel gear 18 that is fixed on support 18. The suiyil works as follows On the gas distribution grid and -1.-4t-rt / -tTT iT-HJiTi brTT ich PP G-iiiTil in t / tr 2 the layer of seed crystals is filled up. The air duct 3 under the grille 2 is supplied under pressure by heated air. The actuator 6 is turned on, which causes the agitator 4 to rotate. During the rotation of the agitator 4, the pinion gear 17, which is in contact with the fixed gear 19, rotates together with the blade 16 in the supports 15 relative to the blade 14 and this produces an efficient mixing of the crystals (granules ). The blade 14 scoops up the granules placed in the boiling layer, and the blade 16 during its rotation effectively mixes them, contributing to better heat and mass transfer. A collector 7 is supplied with a liquid product, for example, sugar or sorbitol diluent, which is sprayed through a nozzle 8 to a finely dispersed state and sprayed onto a layer of agitated blades 14 and 16 of seed crystals. During the drying process, the seed crystals in the product are enveloped with the growth of the granules on the grid 2. As a certain height of the layer, controlled by the chopper 13 is reached, the granules start to be unloaded through the window 12. This replaces the seed crystals with the formed granules. further, fragments of the resulting granules serve. When feeding the liquid product through the nozzle 8, the actuator 10 simultaneously turns on, which drives the helical rotors 9 rotating by the gears 11 in opposite directions. The screw rotors 9 are immersed in a layer of granules. When the screw blades rotate due to the presence of the right a and left coils, the crystals are captured, move to the center under the axis of the nozzle 8, and are thrown by the blades into the torch cone with a fan. In the flare of the dispersed liquid product, the product supplied by the nozzle 8 is effectively wrapped with the product for trT TTYJ-TTirJ - ti 4Tiy-i -.rf i- x-4-nT tf, t h-hh due to an increase in the contact surface of the granules that are in a measured state In the flare is cracked, which speeds up the process of the fractions of the granules. Claim 1-. Spray dryer for liquid products in boiling (Layer of inert bodies containing Kdpnyc with gas distribution grid, spray of liquid product and located above the grid in the layer of inert bodies a driven motor and a blade rotor located above the agitator, characterized by the fact that (Aces of the processes of heat and mass transfer and granulation, the rotor is made in the form of a pair of shafts mounted rotatably in opposite directions, and the rotor blades are made with screw-aligned winding. opposite the ends of the shafts, while the agitator is equipped with a rotating blade. 2. Dryer POP.1, characterized in that the rotating blade of the agitator is kinematically connected with its drive. Sources of information taken into account during the examination 1.- Copyright certificate USSR No. 606065, class F 26 B 17/10, 1978. 2. USSR author's certificate in application number 2892392, cl. F 26 B 3/12, 1980. 17 tuz.Z AT 6 Fig.Z .ir РрЩЩ ( pui.tt