SU1233893A1 - Jet crystallizer - Google Patents

Description

The invention relates to heat- and mass-changing apparatus and can be used in the technological lines of the chemical and adjacent industries from the industry where the crystallization process is to be implemented.

The aim of the invention is to increase productivity by increasing the intensity of the heat sink, increasing the average crystal size by intensifying the processes of nucleation and crystallization, eliminating deposits on the heat sink surface.

FIG. 1 shows the proposed mold; in fig. 2 — node I in FIG. one.

The mold consists of a housing 1, nozzles for introducing a solution 2, a refrigerant 3, vertical partitions 4, a drive with a stem 5, bushings 6 in which spiral tapes 7 are placed, upper (outer) edges attached to the inner wall of the sleeve, and lower (inner) The edges include heat transfer pipes 8, chambers 9 for introducing refrigerant (dispensing chamber), chambers 10 for removing refrigerant (collecting chamber), refrigerant pipes 11, slurry 12, perforated diaphragm 13, hopper 14, pulsation chamber 15.

The mold works in the following way.

A fresh solution is fed into the body 1 of the apparatus through the pipe 2. At the same time, refrigerant enters the nozzle 3, and inside the working cavity of the apparatus, vertical partitions 4 begin to perform reciprocating movements from one wall of the apparatus to another under the action of an actuator with a rod 5. When the vertical partitions 5 move, the solution from one area adjacent to the partition 4 flows to the other, located on the other side, through the pdel formed by sleeve 6

and pipe 8. Since spiral ribbons 7 (Fig. 2) are installed throughout the entire dam of this shell, the solution, the passage of these shells and in contact with the surface of the pipes, is cooled, twisted and goes out of it in the form of a swirling turbulent dispersion of the jet. The crystals formed are centrifugal forces thrown to the peripheral layers of the jet, which are replenished with a warmer solution. The germ crystals dissolve, the solution becomes more saturated in these areas and favorable conditions for crystal growth are created. The swirling jet, continuing its motion at high speed, washes the pipe, cools, reaches the next partition, turns around and, forming vortex flows, intensively mixes with the solution found in the annular space.

Such an organization of heat and mass transfer in a jet mold and determines its high efficiency. The refrigerant from the pipe 3 enters the dispensing chamber 9, passes through the pipes 8, enters the collecting chamber 10 and is discharged from the device through the pipe 11. The suspension obtained in the crystallizer leaves the apparatus through nozzle 12. In order to ensure that the solution flows through the bushings at high speed, a perforated diaphragm 13 is included in the design, preventing the fluid from flowing over the sleeve. The crystals deposited on the perforated diaphragm are intermixed with vertical partitions and pushed into the bunker 14. During the entire operation of the apparatus with the chord strips 7 when moving the vertical partitions 4, the heat transfer tubes 8 are cleaned and they are peeled off. The active surface of the mold plate of the mold, therefore, remains clean all the time.

compiler I. Nenasheva

Editor A. GulkoTekhred I. VeresKorrek and I. Musk;

Order 2676/4 Draw 663 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raun1ska nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (1)

JET CRYSTALIZER, comprising a housing with a pulsating chamber, inlet and outlet pipes of material flows, a stack of horizontally arranged heat exchange tubes connected to the inlet and outlet chambers of a refrigerant, characterized in that, in order to increase productivity by increasing the intensity of heat removal, increasing the average size of crystals by intensifying the processes of nucleation and crystallization, eliminating deposits on the heat transfer surface, it is equipped with a pulsation located in the lower part hydrochloric apertured diaphragm chamber attached to the housing and disposed above the diaphragm perforated by vertical baffles overlapping body section interconnected with a drive rod and provided with perforations arranged in their sleeves with established within them spirally curved strips covering the heat exchange tubes. (L s u with QO s