SU1243762A1 - Crystallizer for desalination of mineralized water - Google Patents

Description

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The invention relates to the desalination of marine, saline, and also mineralized sewage. With the help of crystallization methods, and can be used in the extinction: squeezing and gas hydrate desalination plants.

The purpose of the invention is to increase the efficiency of the crystallization preparatory plant.

The drawing shows the proposed crystallization plant for the desalination of saline water.

The installation consists of a crystallizer 1, pumps 2 and 3, a wash column 4, a melter condenser 5, the lower part of which is a sump 6, an additional condenser 7, compressors 8 and 9, a degasser 10 AND deaerator 11, the Crystallizer 1 is inclined at input side of the suspension and has a stirrer 12, driven in rotation by the electric motor 13. In the output part of the mold, partitions 14 are installed, forming a calming zone, a pipe 15 for taking the slurry and a pipe 165 connecting with additional pipes 17, located under the paddles of the agitators tangentially to the direction of their rotation. Pipe 15 through a coeji iHeH pump 2 with none: a -the part of the wash column 4 having a perforated cone 18. The middle part of the wash column 4 has a pocket with filtering mesh 19 connected by pipe 20 to the inlet of the crystallizer 1, and pipe 21 - with additional condenser 7 and degasser 10. Top

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The installation works as follows (for example, the operation of the installation on the crystal hydrate C; using a hydrating agent, freon 12, is considered. At operation 1; on the contact freezing cycle, for example, using a refrigerant, freon 114, the installation works similarly, the difference is consists in the fact that the processes in the devices are carried out with slightly different parameters, and in the description everywhere instead of

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gas hydrate should be understood ice).

The source solution through deaerator 11, in which dissolved gases are removed from it, is supplied by pump 33 to the entrance to the crystallizer 1, in which it is in contact with the agent supplied from the sump 6 through pipeline 28 and from additional condenser 7 through pipeline 32. I When the agitator is rotated, the suspension is vigorously agitated and its expansion along the crystallizer. Cooling the suspension due to the boiling part of the refrigerant of the wash column 4 has a scraper 22 leading to the formation of gas hydrates, and is connected by a pipe 23 with: Gshavi- resulting in brine concentration

the tele-condenser 5 .. The lower part of the wash column 4 below the perforated cone 18 has a pipe 2 connected through the valve 25 with the side of the suspension entering the crystallizer 1. The upper part of the sump 6 is connected by a pipe 26 through the pump 3 to the upper part of the wash column 4, and pipe 27 through an additional condenser 7 - with a degasser 10. Niels part of the sump 6 is connected by pipe 28 to the side of the suspension entering the mold 1. The melter-condenser 5 is connected by pipe 29 to the discharge side of the comp essora 8 and conduit 30 - to the suction

the cavity of the compressor U, the discharge side of which is connected by pipe 31 to an additional condenser 7. Additional condenser 7 is connected by pipe 32 to the side of the suspension injected into the mold 1. The input side of the suspension in the mold 1 is connected by pipeline through the pump 33 to the deaerator 11. The auxiliary condenser is also provided with a cold water coil 34. .

The installation works as follows (for example, the operation of the installation on the crystal hydrate C; using a hydrating agent, freon 12, is considered. At operation 1; on the contact freezing cycle, for example, using a refrigerant, freon 114, the installation works similarly, the difference is is that the processes in the devices are conducted with slightly different parameters, and in the description everywhere instead of

gas hydrate should be understood ice).

The initial solution through the deaerator 11, in which the dissolved gases are removed from it, is supplied by pump 33 to the entrance to the crystallizer 1, in which it is in contact with the agent supplied from the settling tank 6 through the pipeline 28 and from the additional condenser 7 through the pipeline 32. I When the agitator is rotated, the suspension is vigorously agitated and its expansion along the crystallizer. . Cooling the slurry, due to boiling of a portion of the refrigerant, results in the formation of gas hydrates, with the result that the brine concentration

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along the length of the mold increases, and the ratio of the liquid agent to the brine, which is supplied to the entrance to the mold, is necessary; (due to the expenditure of part of the agent to remove the heat of hydrate formation and the formation of gas hydrates... Moving along the crystallizer, the suspension reaches the partitions 14 ,

50 forming a sedative zone in the upper part of the crystallizer where slurry separation occurs under the action of a difference in density on the brine with gas hydrates at the top and

55 agent at the bottom of the output part of the crystallizer (brine density pj, 10,000-1,100 kg / m; density of hydrates, kg / m, density of the initial

agent P isa.a O kg / m). The liquid agent through the pipe 16 and additional pipes 17 enters the blades of the agitator 12, thereby ensuring the relative constant irrigation density over the agent (the ratio of the liquid agent to the brine) along the length of the crystallizer 1, which contributes to maintaining a constant high rate of gas hydrate formation along the the entire length of the mold.

Suspension (brine with gas hydrates) through pipe 15 by pump 2 is fed to the bottom of the wash column above the perforated cone 18 When particles of a liquid agent enter the bottom of the column, it accumulates under the cone 18 and through pipe 2 through the valve 25 periodically or continuously J In the case of a large amount of liquid agent, it is recirculated to the lower part of the mold 1. Under the action of the hydraulic pressure created by the pump 2, the suspension moves upwards, passing through the zone with filtering mesh 19, in which It dries the suspension due to the separation of the brine under the action of the pressure difference before and after the filter screen 19 (the pressure drop is 30-70 kPa) and accumulates it in a pocket, from which the brine is divided into two streams: one through pipeline 20 returns to the mold, and the second through line 21 through an additional condenser 7 and a degasser .10 is removed from the installation. At the exit from the zone with the filter screen 19, the porous gas hydrate piston begins to form, in which the hydrates are washed

gas from the surface brine stalk by protsevote filtration of fresh wash water supplied through pipeline 26 by pump 3. Washed gas hydrate crystals with a scraper 22 are loosened and supplied through pipeline 23 to the melting condenser 5, where, due to the supply of refrigerant condensation heat, gas hydrates decompose into fresh water and liquid agent flowing into the sump 6. Liquid agent through line 28 is sent to the crystallizer. Desalinated water is divided into two streams, one of which is through line 26 and the pump 3 is fed to washing of gas hydrates in a washing column 4 and the other through the line 27 through the additional capacitor 7 and a degasser 10 is discharged from the installation to the consumer.

The heat of hydrate formation is removed in the crystallizer by boiling a part of the refrigerant, the vapors of which are sucked out of the crystallizer by the compressor 8, which injects them into the melter-condenser 5, where they are condensed, giving off heat to decompose the hydrates. The uncondensed agent vapors are compressed by an additional compressor 9 and pumped into an additional condenser 7, where they are condensed due to heat exchange with the desalinated water and brine discharged from the installation, as well as cooling water pumped over the coil 34, Liquid agent from the additional condenser is returned to the crystallizer through pipe 32 one,

Water

Editor S. Lisin

Compiled by B. Kroekin

Tehred NoBonkalo Regional Director S.Shekmar

Order 3738/7 Circulation 663 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (2)

1. CRYSTALLIZATION PLANT FOR DESCRIPTION OF MINERALIZED WATER, containing a crystallizer in series with a paddle mixer and nozzles for the input and output of brine, agent and suspension, flushing. a column and a crystal melter, characterized in that, in order to increase the efficiency of the crystallization process and reduce energy consumption, the mold is installed obliquely in the direction of the suspension input and is equipped with baffles forming a soothing zone in its output part and additional nozzles located tangentially to the mixer blades the direction of their rotation and connected to the lower part of the sedative zone. 2. Installation according to claim 1, characterized in that, in order to increase the stability of operation, the washing column in the lower part is provided with a perforated cone, and the part of the column located under the perforated cone is connected by a pipeline to the inlet part of the mold. ω CZ 1243762 A1