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The characteristic of scraper
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The characteristic of scraper

 

The characteristic of scraper film evaporator:
  1. Vacuum resistance falling small:
Because of its unique evaporation form, the material that is handled becomes membrane in the evaporation surface, but not agglomerates. Therefore, there is not the problem that liquid pillar static pressure counteracts vacuum degree which exists in other evaporation form (in other evaporation form, the vacuum degree only reflects the vacuum degree of liquid phase main body surface). The vacuum degree showed by systerm is the vaccum degree of material evaporation

  2. Evaporation intensity strong
The enhancement of the vacuum degree, reduces the processed material’s boiling point and enlarges the thermoelectric driving force of the cold and hot medium. The scraper forces causes the liquid membrane to rapids and thinner. And the scraper’s clean fuction keeping from the fouling in the heating surface, which enlarges the heat transfer coefficient, enhances evaporation intensity.
  3. Heated time short:
Because the scraper evaporator is one kind special membrane evaporator, the resident time of material in heating surface is very short, about 10-60 seconds (according to the evaporator’s different specification), specially suitable for dealing with thermosensitive material.

  4. Operation elasticity big:
The quantity of entering the evaporator material in unit time decides the liquid membrance thickness in the heating surface. Because the liquid membrance forces to form depending on the scraper, therefore the material quantity can adjust in very wide range.


The structure of scraper film evaportator:

According to the different character of the material, must use different scrapers. The scraper film evaportators producted by our company includes four types。

1.Centrifugal activity scraper:
This kind of evaporator construction cost is cheap, therefore applies widely; suits to low viscosity material
  2. Hinge activity scraper:
The construction cost of this kind of evaporator is more expensive than centrifugal activity scraper.
  3. Hoop rolling scraper:
This kind of evaporator is suitable for the situation with GMP request or high pure request. The touch way is rolling but not skiding. The scraper nearly has not worn .
  4. Fixed rigid scraper:
This kind of evaporator is suitable for high viscosity material, and the construction cost is the highest in the scraper evaporator.

Evaporation ability:
The evaporation ability of scraper film evaporator is the strongest. Under the standard condition (steam medium; 100% water feeding; vacuum systerm), transpiration rate is approximately 100kg/m2.hr

Type and specification:

Type

Heating area(M2

Equipment height(mm)

Equipment inside diameter(mm)

Weight(kg)

WFE-0.06

0.06

1000

¢70

70

WFE-0.1

0.1

1200

¢80

95

WFE-0.2

0.2

1380

¢100

130

WFE-0.5

0.5

2750

¢265

420

WFE-1.0

1.0

3350

¢300

650

WFE-2.0

2.0

4320

¢400

850

WFE-3.0

3.0

5100

¢400

1400

WFE-4.0

4.0

5600

¢500

1980

WFE-6.0

6.0

6500

¢600

2780

WFE-8.0

8.0

7230

¢700

3250

WFE-10

10

7350

¢900

3750

WFE-12

12

7800

¢1100

4300

WFE-15

15

8500

¢1100

5000

WFE-20

20

10650

¢1200

7500

WFE-24

24

11250

¢1400

8600

WFE-30

30

12500

¢1500

12000

WFE-40

40

15000

¢1700

17000

 
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