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Falling film evaporator

Falling film evaporation is to add the material liquid from the upper tube box of the heating chamber of the falling film evaporator, and distribute it evenly into the heat exchange tubes through the liquid distribution and film forming device. It can be single-effect or multi-effect evaporation and concentration.
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Falling film evaporation is to add the material liquid from the upper tube box of the heating chamber of the falling film evaporator, and distribute it evenly into the heat exchange tubes through the liquid distribution and film forming device. It can be single-effect or multi-effect evaporation and concentration.

 

 

Under the action of gravity, vacuum induction and air flow, it flows into a uniform film from top to bottom. During the flow process, it is heated and vaporized by the heating medium in the shell side, and the generated vapor and liquid phase enter the separation chamber of the evaporator together. After the vapor and liquid are fully separated, the vapor enters the condenser for condensation (single-effect operation) or enters the next-effect evaporator as The medium is heated to achieve multi-effect operation, and the liquid phase is discharged from the separation chamber.
The main body of the equipment is composed of Ⅰ, Ⅱ, Ⅲ effect heaters, separators, heat pumps, condensers, sterilizers, insulation pipes, material pumps, water pumps and instrument cabinets. This equipment is made of high-quality stainless steel when it comes into contact with materials.
 
Application scope of falling film evaporator
It is widely used in the evaporation and concentration of water or organic solvent solutions in medicine, food, chemical, light industry and other industries, and can be widely used in the treatment of waste liquids in the above industries. It is especially suitable for heat-sensitive materials. The equipment operates continuously under vacuum and low temperature conditions. It has high evaporation capacity, energy saving and consumption reduction, low operating costs, and can ensure the invariance of materials during the evaporation process.
 
Falling film evaporator process
The process flow has four forms: cocurrent (parallel flow), countercurrent, mixed flow (cross flow), and advection.
Downstream: The solution and steam flow in the same direction, and both flow sequentially from the first effect to the last effect. The raw material liquid is pumped into the first effect, depending on the pressure difference between the effects, it automatically flows into the next effect, and the finished liquid is pumped out of the last effect (usually operating under negative pressure). Because the pressure of the latter effect is low, the boiling point of the solution is also low. When the solution enters the latter effect from the former effect, it will flash part of the water and produce more secondary steam. Because the concentration of the latter effect is higher than that of the former effect and the operating temperature is lower , Often the heat transfer coefficient of the first effect is much higher than that of the final effect. The downstream process is generally suitable for processing materials that are heat sensitive in high concentrations.
Reverse flow: the raw material is sent from the last effect to the front effect by the pump, the finished liquid is discharged by the first effect, and the material liquid and steam flow in the reverse direction. It is generally suitable to handle solutions whose viscosity changes greatly with temperature and concentration, and it is not easy to handle heat-sensitive materials. 
Mixed flow: It is a combination of forward and reverse flow processes, which has the advantages of both forward and reverse flow to avoid its shortcomings, but the operation is complicated and requires a high degree of self-control. 
Advection: each effect is fed and the finished liquid is discharged, and each effect has crystals, which can separate the crystals in time, and is generally used for the evaporation of saturated solutions.
 
Specification model

specification

Distilled water(Kg/h)

Total heat transfer area(㎡)

Tube length(m)

Effective number

Steam consumption(t/t)

Total power(KW)

CZJMR05-28

28000

1674

9

5

0.135-0.17

27.5

CZJMR05-22

22000

1349

9

5

0.136-0.17

24.5

CZJM05-30

30000

1160

9

5

0.27

20

CZJM05-22

22000

730

6

5

0.275

19

CZJMR04-20

20000

1136

9

4

0.17-0.19

17.5

CZJMR04-15

15000

700

8

4

0.17-0.19

8.8

CZJMR04-8

8000

360

6

4

0.18-0.2

6.6

CZJM04-15

15000

420

9

4

0.3-0.31

6

CZJM04-8

8000

220

6

4

0.3-0.31

4.5

CZJMR03-7

7000

265

6

4

0.29-0.32

13.5

CZJM03-13

13000

478

6

3

0.29-0.31

3.7

CZJM03-10

10000

197

6

3

0.4-0.42

2.2

CZJM03-7

7000

130

6

3

0.4-0.42

4.4

CZJMR02-3.5

3500

91

4.5

2

0.38-0.42

9.5

CZJMR02-10

10000

274

6

2

0.38-0.41

2.7

CZJM02-2

2000

58

3

2

0.4-0.42

1.1

CZJM02-3.5

3500

80

4.5

2

0.57-0.6

2.2

CZJM02-10

10000

175

6

2

0.57-0.6

4.4

CZJM02-2

2000

46

3

2

0.57-0.6

2.2

CZJM02-5

5000

114

6

2

0.57-0.6

3

CZJMR01-1

1000

25

3

1

1.1-1.15

13

CZJM01-1

1000

20

3

1

1.1-1.15

3

 

 

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