SU1212454A1 - Crystallizer - Google Patents

Description

I

The invention relates to the field of chemical engineering, in particular to crystallizers, intended for the crystallization of solutions of organic and inorganic substances.

A known mold, which is a rotating hollow drum, equipped with a bucket and installed at an inclined-horizontal plane on the supporting and supporting-stop stations, I qTBOp and refrigerant are fed. in the mold countercurrent. During the rotation of the drum, up to the bottom surface of the drum is distributed with a thin film and cooled, and crystals, which move inside the rotating drum towards the discharge side, fall out of solution.

To prevent incrustation on the heat transfer surface inside the rotating drum, a free-lying scraper C13 is placed in its lower part.

A mold is also known, which is a rotational start. a full drum, equipped with bandages and mounted obliquely on supports, a device for cooling the solution with fittings for inlet and outlet of coolant, scrapers, a chamber for unloading the suspension, driving the rotation of the drum.

The solution and coolant are fed to the mold in a countercurrent. During the rotation of the drum on its inner surface, the solution is distributed by a thin film and cooled, while crystals fall out of the solution and move inside the rotating cylinder towards the discharge side.

In order to prevent the formation of inlays on the loop of the surface inside the rotating drum, in its lower part there is a loosely lying scraper consisting of separate C 21 links.

A disadvantage of the known crystallizer is low productivity due to the absence of intensive mixing of the initial solution and coolant, which does not allow to intensify the process of crystal growth.

The aim of the invention is to increase the removal of the product from the unit 1 to carry heat exchange due to intensi

fiatsii mixing the original solution ..

This goal is achieved by the fact that in the mold containing

a nasal solution drum equipped with bandages and mounted on supports, a device for cooling the solution, having a nozzle for inlet and outlet of coolant, a scraper for cleaning the heat transfer surface from incrustation, a chamber for unloading the suspension, a drive for rotating the drum, the latter is communicating with each other a friend

cylindrical sections alternately shifted relative to its longitudinal axis.

In addition, adjacent cylindrical sections are displaced in opposite directions, located inside the common cylindrical shell and resting on its inner wall.

Fig. I depicts a mold; figure 2 - section aa on 4ig.1}

Fig. 3 shows an embodiment of a mold without a cylindrical shell.

 The mold contains a drum 1, made in the form of balanced

eccentric shaft, fitted with jacket 2 to contain coolant, tires 3 and 4, mounted on roller bearings 5 and 6, crown gear 7 to turn the drum; collector 8 to supply coolant to jacket 2, scraper 9 to clean the inner surface of the drum from incrustation, support 10 and support-station 11 stations, a drain chamber 12 for coolant, equipped with a discharge nipple 13, unloading; a special camera 14 for removing the suspension, equipped with a fitting 15, drive station 16 for

rotation of the crown gear 7 mounted on the jacket 2, the fitting 17 for supplying the initial solution, the fitting 18 for supplying the coolant.

The rotation of the crown gear 7 is carried out from the gear 19 of the drive station 16. The drum I is equipped with an end wall 20 with holes 21 for removing the suspension

and end wall 22 from the coolant discharge.

The mold works as follows.

The initial solution is supplied through the nozzle 17 to the inside of the rotating drum 1, which is cooled outside by bringing coolant to the inside of the jacket 2 by countercurrent through the nozzle 18 and discharging the spent coolant through the fitting 13. As the solution cools, during intensive mixing it inside the rotating drum made in the form of a balanced hollow body eccentric shaft and coolant in the jacket, crystals fall out of solution and continuously grow, which together with the liquid phase in the form of a suspension move along the drum in the direction of discharge, and then through, opening 21 in the end wall 20 enters the discharge chamber.

In Ttppnecce of the rotation of the drum 1, the scraper 9 freely lying slides on the internal heat transfer surface, preventing the incrustation in place.

Heat exchange surface, m Material performance

Volumetric flow rate of the original product

Service life taking into account obsolescence, years

Resource to the first cap. repair, h

Effective equipment operation fund per year, h

Electric motor power, kW

2124544

The unloading of the mold is performed continuously during the operation of the mold through the nozzle 15. The execution of the drum 1 in the form

5, a hollow, balanced, eccentric shaft allows intensive mixing of the solution along the entire length of the drum and coolant in the jacket 2; in addition, short scrapers are more

About qualitatively clean the heat exchange surface, since they are less prone to distortions along the length of the drum. These measures can significantly increase the ratio /

15 heat transfer, and consequently, to intensify the performance of the mold.

Such a water cooled crystallizer design can find

20 use in the chemical industry for the crystallization of aqueous organic solutions of organic and inorganic substances.

The comparative characteristic of the known crystallizer with the proposal is given in the table.

2.5 Steel 12X18N10T

0.8801.15

3,383,55

(28600: 8460) (30000: 8460)

28600

30,000

8460

8460

7.5

5.5

Product weight, kg Product price, rub

Annual operational costs of the consumer (electricity), rub.

Table continuation

8900 7820

9300

UP. 23-03.2 1 p. 04-11)

1218 1745

FIG.

Editor V.Ivanova

Compiled by O. Zobnin Tehred J. Kastelevich

/ Order 667/7 Circulation 663 Subscription

VNIIPI USSR State Committee

for inventions and discoveries P3035, Moscow Zh-35, Raushsk nab., 4/5

Branch PPP Patent, 4 Proektna St.

Fig.d

Proofreader M.Maksinshinshets

Claims (2)

1. CRYSTALIZER, containing drum, equipped with bandages and mounted on supports, a device for cooling the solution with fittings for input and output of coolant, scrapers for cleaning heat. the transfer surface from inlays, a chamber for unloading the suspension, a drive for rotating the drum, characterized in that, in order to increase the removal of the product from a unit of the heat exchange surface due to the intensification of mixing of the initial solution, the drum is made in the form of cylindrical sections communicating with one another, alternately offset relative to its longitudinal axis. 2. The mold according to claim 1, characterized in that the adjacent cylindrical sections are offset in opposite directions, are located. inside a common cylindrical shell and rest on its inner wall. Figure 1