SU1360759A2 - Crystallizer - Google Patents

Abstract

The invention relates to XHNn-f ec engineering, namely, crystallizers, intended for crystallization from solutions of organic and inorganic substances, and allows to increase the productivity of the crystallizer on the crystalline product due to the intensification of heat and mass transfer processes. For this, the centers of cylindrical sections are located along helix lines with consecutive bias across the angle of 2/3 ir-1/3 rad, with cylindrical sections in places of support on the inner wall of the cylindrical shell and shirts are equipped with ribs located along the longitudinal axis of the drum 2 or 1 tab. Zfo 35 vj D1 K)

Description

The invention relates to chemical engineering, in particular, to cryptographic crystals intended for crystallization from solutions of organic and inorganic substances, and is an improvement of the device according to the authors. Eve about № 1212454.

The purpose of the invention is to increase the performance of the crystallizer on the crystalline product due to the intensification of the process of heat and mass transfer.

Figure 1 shows a mold; on fig2 - section A-A on fggo1.

The mold contains a drum 1, made in the form of an equilibrium eccentric shaft, equipped with a jacket 2 for containing coolant, bandages 3 and 4 mounted on roller bearings 5 and 6, a crown gear 7 for rotating the drum, a ring gear 8 for supplying coolant jacket 2, scraper 9 for cleaning the inner surface of drum 1 from incrustation, support 10 and support station 11, drain box 1 12 for coolant, equipped with outlet nozzle 13, discharge chamber 14 for removal of suspension, equipped with nozzle 15,a drive station 16 for rotating the ring gear 7 mounted on the jacket 2, a fitting 17 for supplying a stock solution, a fitting 18 for supplying a coolant

The crown gear 7 rotates from the gear 19 of the drive station 16o. The drum 1 is provided with an end wall 20 with an opening 21 for removing the suspension and an end wall 22 from the coolant discharge side. Structurally, the drum 1 consists of separate cylindrical sections 23 sequentially offset from the longitudinal axis of the drum - CIM in the way that their centers are located along a spiral line and are successively displaced circumferentially by an angle of 2 tr / 3 - iT / 3 is RAD. In this case, the cylindrical sections in the places of support on the inner wall of the cylindrical The casing shell is provided with ribs 24 located along the axis of the drum.

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 externally by

supplying the coolant inside the jacket 2 with countercurrent through the fitting 18 and discharging the spent coolant through the fitting 13. As the solution is cooled during intensive mixing inside the rotary drum made in the form of a balanced hollow eccentric shaft and coolant, in a jacket, drop out of the slurry and continuously stretch the mold. together with the liquid phase in the form of a suspension, they move along the drum in the direction of loading, and then through openings 21 in the end wall 20 enter the discharge chamber measure

During the rotation of the drum 1, the scraper 9 freely lying slides 0 on the internal heat transfer surface preventing the incrustation from depositing. The crystallizer is unloaded continuously during the operation of the crystallizer through the nozzle 15 5 The implementation of the drum 1 in the form of a hollow balanced eccentric shaft allows for intensive mixing of the crystallized solution (suspensions) inside a rotating drum along its longitudinal axis to significantly increase the heat transfer coefficient from the cooled p alignment (slurry) to the heat transfer surface of the drum; to increase the heat exchange surface in the places of support of the cylindrical section to the inner wall of the cylindrical drum shell and intensify the heat removal from the entire working surface of the cylindrical sections; to exclude the unrestricted movement of the crystals towards the suspension unloading, thereby increasing the residence time of the crystals in the working volume, f. the crystallizer and, therefore, the contact surface of the phases at the crystal-solution interface, which significantly intensifies the process of mass transfer.

Comparative characteristics of the known and proposed molds are given in the table.

five

50

55

As can be seen from the table, with the same mass of the crystallizer, the heat exchange surface of the claimed crystallizer is 1.2 times larger, and the productivity is 1.5 times higher than that of the known crystallizer, which is

,about

This is due to an increase in the heat and mass transfer coefficient achieved due to better mixing of the suspensions inside the drum and efficient use of the entire outer surface of the drum in heat transfer.

Claims (1)

Invention Formula Mold on auth. St. No. 1212454, characterized in that, in order to increase the product output Volumetric flow rate of the original solution, 1J5, 7 Active heat exchange surface, 30 Heat transfer coefficient,% The residence time of the solution in the crystallizer,% Material performance Mold weight, kg 360759 I water content of the crystallizer on the crystalline product due to the intensification of the process of heat and mass transfer, the centers of the cylindrical section are located along a spiral line, with a successive displacement of the circumference by an angle of / 3 rad, with the cylindrical sections in place . The 1Q supports on the inner wall of the cylindrical shell are provided with ribs located along the longitudinal axis of the drum. Ammonium Sulphate 100 120 100 115 Steel Steel 12X18H10T 12X18N10T 7820 7820 / 3 g 21 2J 7  ZO 8 u 21 IS Editor P.Geershi (rig 2 Compiled by S.Trifonov Tehred M. Morgental Order 6174/9 Circulation 657 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, ul, Proektna, 4 Proofreader L. Pilipenko