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Material HandlingConveying System / Pneumatic
Conveying System (P.C.S.) |
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| Pneumatic Conveying System conveying powder/pellets
through the Tube (conveying pipe) by utilizing the flow of the medium
gas such as air. There are mainly 3 kinds of Flow Pattern such as Plug
Flow, Dune flow and Floating Flow (dilute phase system), when it classifies
from the flow pattern of powder/pellets. The specification of system
constitution and constitution equipment shall be changed by Flow Pattern.
Accordingly, the design of Pneumatic Conveying System starts from the
selection of Flow Pattern. |
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| The Plug Flow conveying is like that
powder/pellets moves while forming the group like plug (slug),
without taking a floating and be one of a dense phase conveying
system. In the system, there is little air consumption and very
good conveying efficiency, also it can convey almost without piping
abrasion and crushing of conveying material. Also, there is no
occurrence of streamer in case of resin pellet conveying. |
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| The Dune Flow conveying is like that
powder/pellets moves while making slug movement with group style
form like a sand dune in the bottom of conveying pipe, this is
one of a Dense Phase Conveying System. In case of coarse (large)
powder and pellets, the formation principle is almost similar with
Plug Flow. But the difference between Plug Flow is that there are
no close particle groups or very few in conveying pipe. Dune Flow
conveying is very suitable method for especially small powder because
easy to include air and be able to use the principle of the fluidization
by a flushing phenomenon. The actual conveying system will be designed
in the same gas velocity area, without distinguishing coarse (large)
powder and small powder. |
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| Layer Flow
(Middle Velocity Conveying) |
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| Suspension Flow (Dilute Phase Conveying) |
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| The Floating Flow conveying, the gas
velocity inside conveying pipe is fast and powder/pellets move
taking a flight, this is one of Dilute phase Conveying System.
In the type of Floating Flow, there are two kings of flows such
as Layer Flow and Suspension(Dispersion)Flow. Layer
Flow is comparatively low (Middle) gas velocity and powder/pellets
focuses on bottom of conveying pipe(Refer
below Note). Suspention Flow is comparatively
high gas velocity and powder/pellets is conveyed with dispersed.
There are few restriction conditions to the system and also it
can be easily designed and be used widely from old times. |
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| Classification |
Flow Pattern |
System Name |
Application |
| Pellet |
Powder |
Non-uniform |
| 1 |
Mass Flow like Plug
Plug Flow (Slug Flow) |
Plug Flow Dense Phase
Conveying System
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| 2 |
Dune Flow
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Dune Flow Dense Phase
Conveying System
Powder Dense Phase Conveying System |
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| 3 |
Layer Flow
Floating Flow |
Middle Velocity Conveying
System
High Pressure Dilute Phase Conveying System |
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| Suspension Flow |
High Velocity Conveying
System
Dilute Phase Conveying System |
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: Applicable |
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: Applicable for only non compressive character |
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: Applicable for without deforming and good ventilation
character |
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: Not applicable |
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| [Note] High Pressure Dilute Phase / Middle Velocity
Conveying System |
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In case of high pressure conveying system adopted
Floating Flow (Dilute Phase), mixing ratio becomes higher in comparison
with normal Low Pressure Dilute System. Also gas velocity can be
lower than normal Dilute System, it can be called as [Middle Velocity
Conveying System]. |
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The SANKO Middle Velocity Conveying System is
having good advantage to avoid some problems like  drop
of conveying material quality by too fast velocity, conveying pipe
abrasion, occurrence of streamer,  powder remaining and
line blocking at the conveying feeder section by reason of shortage
of gas velocity and also pressure fluctuation. SANKO can design
the Conveying System with good stability, low plant cost and low
running cost by this method. |
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