RU2543913C2 - Spray dryer of boiling bed with passive nozzle - Google Patents

Spray dryer of boiling bed with passive nozzle Download PDF

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RU2543913C2
RU2543913C2 RU2013130947/06A RU2013130947A RU2543913C2 RU 2543913 C2 RU2543913 C2 RU 2543913C2 RU 2013130947/06 A RU2013130947/06 A RU 2013130947/06A RU 2013130947 A RU2013130947 A RU 2013130947A RU 2543913 C2 RU2543913 C2 RU 2543913C2
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nozzle
conical
made
holes
angle
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RU2013130947/06A
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RU2013130947A (en
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Олег Савельевич Кочетов
Игорь Георгиевич Гетия
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Олег Савельевич Кочетов
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Abstract

FIELD: heating, drying.
SUBSTANCE: invention refers to disperse material drying in boiling bed and may be applied in aniline-ink industry, food, pharmaceutical, microbiological, chemical and other industries. spray boiling-bed dryer with passive includes body with gas dispersing grate, vibrating plates, passive nozzle, vibration device; collection system with acoustic unit is positioned in the lower body part; solution sprinkler includes hollow cylindrical body consisting of cylindrical part with outer thread and two hollow cylinder-conical bands connected in series and coaxial to the body, nozzle with cylindrical fillet on its conical surface with external thread for nozzle connection to the lower cylinder-conical band of the body; opposite to solution feed side, there is an additional row of jets formed by at least three pairs of mutually perpendicular vertical channels for solution flow and horizontal channels forming output holes of each jet; conical side surface of the nozzle has 90° top angle; cylinder-conical band features two rows of throttle holes, so that hole axis projections on a horizontal surface in these rows are separated by an angle within optimum 7.5-60° range, and internal surfaces of throttle holes on cylinder-conical bands have helical surfaces.
EFFECT: improved dryer performance.
2 dwg

Description

The invention relates to techniques for drying dispersed materials in a fluidized bed and can be used in aniline-colorful, food, pharmaceutical, microbiological, food, chemical and other industries.

The closest technical solution to the claimed object is a dryer for drying solutions, suspensions and pastes in a fluidized bed according to the patent of Russian Federation №2328665, F26B 17/10, containing a housing with a perforated motionless jammed gas distribution grill with an inert nozzle, a spray, a vibration mechanism made in the form plates installed in the dryer body with the possibility of rotation relative to the axes kinematically connected with the cam and controlled by it according to a given law (prototype).

The disadvantage of the prototype is the relatively low productivity of drying the final product, since in the known installation, the liquefaction of a layer of inert bodies is achieved due to the shock effects of the vibrating plates. However, the vibration of the plates is transmitted only to the layer of inert bodies adjacent to them, therefore the remaining mass of the layer liquefies less intensively, which is especially evident when working on installations with large dimensions.

The technical result is an increase in drying performance.

This is achieved by the fact that in a spray dryer of a fluidized bed with an inert nozzle containing a housing with a gas distribution grid, vibrating plates, an inert nozzle, nozzle, and a vibration mechanism made in the form of plates mounted in the dryer body with the possibility of rotation relative to the axes on vibrating plates in additional plates of different lengths are rigidly fixed in a checkerboard pattern at an angle to vibrating plates lying in the range, for example, 80 ... 40 °, and the free vertices of the additional plates at the right the vibrating plate face up and the left side down, and in the lower part of the housing there is a capture system, which includes an acoustic installation, where acoustic agglomeration of small particles occurs, a cyclone and a bag filter with a hopper, and the nozzle is made acoustic and contains a resonator made in at least one spherical cavity located in the end wall of the housing facing the distribution head, and the spherical cavity is connected by a calibrated hole with a gap between the vertical a hole in the end wall of the housing and the rod of the distribution head, and in a section perpendicular to the axis of the rod, the gap has an annular cross section, and the distribution head is made in the form of a housing with a cover in the form of truncated cones connected by large bases, and a collector in the form of a cylindrical cavity connected by an annular channel formed by the outer cylindrical surface of the hollow rod and holes of the same diameter coaxial with it, made respectively in the lid and core truncated distribution head, with at least three uniformly arranged along the circumference and perpendicular to the axis of the rod to exit channels solution and the cut holes located on the conical surface of the dispensing head cover, the slope of which determines the angle of the root flame sprayed solution.

In FIG. 1 shows a fluidized bed spray dryer with an inert nozzle, general view; in FIG. 2 is a diagram of a solution atomizer.

The spray dryer of the fluidized bed with an inert nozzle consists of a drying chamber 1 of a cone-shaped rectangular section, in the upper part of which there is a feeder for pastes or a spray of 3 solutions.

The drying chamber 1 with a gas distribution grid 2 is equipped with nozzles for input 4 and output 12 of the coolant. Inside the chambers there are two (left and right) vibrating plates 6 mounted at a certain angle to the inert material layer, for example 30 ... 40 °. Vibrating plates 6 at a distance of approximately

Figure 00000001
2/3 from the upper end pivotally mounted on the shaft 7 in a drying chamber with inert packing body 5, allowing them to oscillate about the shaft axis 7. On the vibrating plates 6 in a staggered rigidly secured additional plates 11 of different length at an angle to the vibrating plates 6 lying in the range, for example, 80 ... 40 °, and the free vertices of the additional plates 11 at the right vibrating plate 6 are facing up, and at the left (not shown) - down. Additional plates 11 serve for more intensive mixing of the inert nozzle.

The plates 6 with the rods 8 are connected to the cam 9, and the rods are pressed against the cam by a spring 10. The vibrating plates 6 transmit dynamic and static effects to the inert material layer 5 and give it a certain law of motion, which is achieved by the angle of the vibrating plates 6, the profile of the cam 9 and its number revolutions. Cam 9 is mounted on a drive shaft (not shown). The cam is used to set a specific, for example sinusoidal, law of motion of the vibrating plates 6.

As a feeder for the wet initial product, this apparatus uses a solution sprayer (Fig. 2), which contains a hollow body consisting of a cylindrical part 16 with an external thread for connecting to the nozzle of the distribution pipe for supplying the solution, and two serially connected and coaxial with it hollow cylindrical conical belts 17 and 18.

A nozzle 19 is formed coaxially with the housing in its lower part and is formed by the outer conical surface and the end, perpendicular to the axis of the nozzle, a blind partition 20, in which a central throttle hole 21 and at least three inclined holes 22 are made at an angle of 45 ° to the nozzle axis. On the conical surface of the nozzle 19, a cylindrical flange with an external thread is made for connecting the nozzle to the lower cylinder-conical belt 18 of the housing.

The housing and the nozzle 19 form among themselves several coaxial inner cylindrical chambers 23, 25, 26, 27 and a conical chamber 24.

The chamber 23 serves to supply the solution, the chambers 24, 25 and 27 are expansion chambers, and the chamber 26 performs the functions of a pressure chamber.

An additional row of nozzles is made on the nozzle 19 from the side opposite to the solution supply, which are formed by at least three pairs of mutually perpendicular vertical channels 31 for the passage of the solution and horizontal channels 30 that intersect on the conical lateral surface of the nozzle 19 and form the outlet openings of each from the jet. Paired channels 30 and 31 are located at right angles to each other in the longitudinal planes of the housing. The conical lateral surface 19 of the nozzle is made with an angle at the apex equal to 90 °.

On the cylindrical conical belt 17, rigidly connected to the cylindrical part 16 of the housing with an external thread, two rows of throttle holes are made: one row is at least three horizontal holes 28 made on a cylindrical surface, the other row is at least three inclined holes 32 at an angle of 45 °, made on a conical surface. Moreover, in the horizontal plane of the projection of the axes of the holes 28 and 32 in these rows are separated from each other by an angle of 7.5 ... 60 °.

A row consisting of at least three horizontal throttle holes 29 is made on the cylinder conical belt 18 connected to the nozzle 19 by means of an internal thread. Moreover, in the horizontal plane of the projection of the axes of the holes 29 and the nozzles, which are formed by at least three pairs mutually perpendicular vertical 31 and horizontal 30 channels on the conical lateral surface of the nozzle 19, are separated from each other by an angle lying in the optimal range of values: 7.5 ... 60 °.

On the inner surfaces of the throttle holes 28.29 and 32 located on the cylinder conical belts 17 and 18, helical surfaces are made. This allows you to increase the fineness of the sprayed solution due to the formation of a vortex flow in these holes.

Spray fluidized bed dryer with an inert nozzle operates as follows.

The required amount of inert material is loaded into the drying chamber 1, then the drive is turned on, from which the cam 7 rotates. The latter, through the rods mounted on the axis of the shaft 5 of the vibrating plates 4, transmits the movement to the vibrating plates and the gas distribution grid 6. Shock-vibration effects of the vibrating plates 4 s additional plates 9 and 10 and the springs of the gas distribution grid 6 are transferred to the layer of particles of inert material, which, when impacted, make complex circulation movements in the drying chamber 1. the heat transfer medium is fed to the jam 3, which heats the drying chamber 1 and a layer of inert material. After uniformly heating the drying chamber 1, a dried material is fed through the paste feeder or pneumatic nozzle 2 into the drying chamber 1, which is sprayed or smeared on the top layer of inert material, then dried, chipped and leaves through the gas distribution grid 6 and pipe 11 to the recovery system: first in the acoustic installation 12, where there is an acoustic agglomeration of small particles, and then in the cyclone 13 and the bag filter 14 with the hopper 15.

The work of a fine spray of the solution is as follows.

The sprayer is installed in an upright position. When the solution is supplied to the housing 16 under the action of a pressure drop of 0.4 ... 0.8 MPa, capillary turbulent flows of the solution are formed in the channels and throttle openings, rushing to the outlet sections of these holes.

After the collision of the solution flows in the channels 30 and 31 and the outflow through the nozzle outlet openings, a fan-shaped gas-solution flow in the form of a shroud occurs, i.e. a solution droplet crushing mechanism is implemented, but the generated swell-like flow deviates from the horizontal plane by a larger angle, in the range from 45 to 60 °, in the direction of the central region of the irrigated surface located directly under the central throttle hole 21 in the blind partition 20 of the atomizer. This distribution of the sprayed solution allows to increase the uniformity of spraying the solution over the Central part of the irrigated surface.

In the proposed installation, the gas distribution grid 6 is made in the form of a package of grids assembled from metal springs (not shown in the drawing), connected or in contact with one another, which are connected to vibrating plates.

Such a gas distribution lattice makes it possible to more evenly liquefy a layer of inert bodies due to the oscillatory movement of the vibrating plates and the influence of inertia on them arising from the pulsating compressive-tensile movements of the gas distribution lattice. This design of the gas distribution grid solves the problem of its cleaning when drying sticky materials. The continuous regeneration of the mesh lattice occurs as a result of the constant displacement of the individual elements of the lattice relative to each other during vibration.

As a result of drying, fine powders of products with a moisture content of up to 0.8% are obtained.

Claims (1)

  1. An inert fluidized bed spray dryer containing a housing with a gas distribution grid, vibrating plates, an inert nozzle, a solution spray, a vibration mechanism made in the form of plates mounted in the dryer body with the possibility of rotation relative to the axes, additional vibrational plates are stiffly fixed to the vibrating plates plates of different lengths at an angle to the vibrating plates lying in the range, for example, 80 ... 40 °, and the free vertices of the additional plates at the right are vibrating the first plate is facing up, and the left - down, and in the lower part of the housing there is a capture system, which includes an acoustic installation, where the acoustic agglomeration of small particles, a cyclone and a bag filter with a hopper, characterized in that the solution sprayer contains a hollow cylindrical body consisting of a cylindrical part with an external thread for connecting to the nozzle of the distribution pipe and two hollow cylindrical-conical belts connected in series and coaxial with it, and coaxially to the body in e the lower part of the nozzle is fixed, formed by the outer conical surface and the end, perpendicular to the axis of the nozzle, a blind partition in which the central throttle hole and at least three inclined holes are made at an angle of 45 ° to the axis of the nozzle, with a cylindrical a flange with an external thread for connecting the nozzle to the lower cylindrical conical belt of the housing, while on the nozzle, from the side opposite to the solution supply, an additional row of nozzles are formed, which are formed at least three pairs of mutually perpendicular vertical channels for the passage of the solution and horizontal channels that intersect on the conical lateral surface of the nozzle and form the outlet openings of each of the nozzles, and the paired channels are located at right angles to each other in the longitudinal planes of the housing, the conical lateral surface of the nozzle is made with an apex angle of 90 °, and on the cylinder conical belt rigidly connected to the cylindrical part of the body, two rows of throttle openings are made s: one row represents at least three horizontal holes made on a cylindrical surface, the other row represents at least three inclined holes at an angle of 45 °, made on a conical surface, while in the horizontal plane of the projection of the axes of the holes in these rows, they are spaced apart from each other by an angle lying in the optimal range of 7.5 ... 60 °, and a row consisting of at least three horizons is made on the cylinder conical belt connected to the nozzle by means of an internal thread throttle holes, while in the horizontal plane of the projection of the axes of the holes and nozzles, which are formed by at least three pairs of mutually perpendicular vertical and horizontal channels on the conical side surface of the nozzle, are separated from each other by an angle lying in the optimal range of values: 7 , 5 ... 60 °, and on the inner surfaces of the throttle holes located on the cylinder-conical belts, helical surfaces are made.
RU2013130947/06A 2013-07-08 2013-07-08 Spray dryer of boiling bed with passive nozzle RU2543913C2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105021026A (en) * 2015-07-29 2015-11-04 梧州市渝鑫稀贵金属有限公司 Vertical shaft drying kiln

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2328665C1 (en) * 2007-01-09 2008-07-10 Олег Савельевич Кочетов Distributing dryer of boiling bed with passive nozzle
RU2343375C1 (en) * 2007-07-03 2009-01-10 Олег Савельевич Кочетов Spray drier of boiling bed with passive head piece
RU2427402C1 (en) * 2010-08-20 2011-08-27 Олег Савельевич Кочетов Kochetov's sprayer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2328665C1 (en) * 2007-01-09 2008-07-10 Олег Савельевич Кочетов Distributing dryer of boiling bed with passive nozzle
RU2343375C1 (en) * 2007-07-03 2009-01-10 Олег Савельевич Кочетов Spray drier of boiling bed with passive head piece
RU2427402C1 (en) * 2010-08-20 2011-08-27 Олег Савельевич Кочетов Kochetov's sprayer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105021026A (en) * 2015-07-29 2015-11-04 梧州市渝鑫稀贵金属有限公司 Vertical shaft drying kiln

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