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Nara Paddle Dryer (NPD)

Product Outline

NPD is a dryer that is used for various fields of materials such as resin, sludge, food, chemicals, etc. The most remarkable point is in the wedge shape of the heat exchanging paddles, which is developed by NARA. NPD is used by various customers in all over the world as a leading dryer in this field.

Application

Operation
Drying, Solvent recovery, Heating, Sterilization, Reaction, Cooling, Vacuum drying, etc.
Material
Wide range of particle size and shapes such as fine particles, granules, pellet, flakes.
Also, available for the material with high moisture content, slurry, and high viscosity.

Features

  • Dryer size is minimized, due to the large heat transfer area per volume.
  • The wedge shaped paddles goes into the powder to enhance contact to the heat transfer area, and the heat transfer coefficient is relatively high due to the good mixing. So, high heating factor can be obtained. Also, the fullness of the materials is high as 80-90%, therefore large heat transfer area can be efficiently used.
  • Since two shafts overlap each other, it prevents the adhesion of powder on the paddle wings, therefore keeping a good heat transfer.
  • The residence time distribution is sharp and the powder is uniformly dried.
  • Since the required carrier gas amount is small, the exhaust gas treatment system can also be minimized. This is a big advantage, especially for the closed system with inert gas circulation for solvent recovery.
  • Slurry with high moisture content or materials with high viscosity can be treated.
  • Available under the vacuumed condition as well, for materials which are sensitive to high temperatures.
  • By using oil for the heat medium, it is possible to use high temperature up to 290oC.

Specification

Type NPD-
1.6W-G
NPD-
3W-G
NPD-
4W-G
NPD-
5W-G
NPD-
6W-G
NPD-
7W-G
NPD-
8W-G
NPD-
9W-G
NPD-
10W-G
Heat Transfer Area (m2) 2.5 8.5 12.7 17.8 22.9 32.7 45.2 60.2 73.8
Effective Volume (m30.065 0.348 0.64 1.1 1.6 2.46 3.76 5.1 7.05
Padddle Wing (mm) 160 300 400 500 600 700 800 900 1000
Rotation Speed (min-1) 30 21 18 17 15 13 12 10 10
Power(kW) 1.5 3.7 5.5 7.5 15 18.5 30 45 45
Type NPD-
11W-G
NPD-
12W-G
NPD-
13W-G
Heat Transfer Area (m291 102 122.3
Effective Volume (m39.06 11.18 13.9
Padddle Wing (mm) 1100 1200 1300
Rotation Speed (min-19 9 8
Power(kW) 55 55 75
※We will manufacture NPD-13W and larger equipment as a special specification.
※We have experience in installing NPD-14W with 204m2 heat transfer
For type other than those above, we will design and manufacture in accordance with your request.

Reference