Urea Granulation Technology of Double Drums with a Fluidized Bed(3)
1. The Major Contents of DDG Technology
*a) Technology Name:
Urea Granulation Technology of Double Drums with a Fluidized Bed
*b) Technology Brand:
DDG
*c) A Brief Introduction to the DDG Technology
The basic contents of the DDG Technology is to put the melted urea into
the granulation drum, and make it to meet the prilled urea back from the
shaken sieve, so that to make the pellets enlarged until to reach the
required size. After the sieved pellets come out of the granulation drum, let
the eligible granular urea move into the cooling drum for cooling down,
then the product can go out for sale. The tail gas will be out to the sky after
being washed up by the washing system.
*e) The Patent Equipments:
The key facilities of DDG technology are consisted of the following two
rotary drums:
*(1) The Granulation Drum with a Fluidized Bed:
In the granulation drum, a fluidized bed and a sprayer and other
components are installed properly. In the drum, the prilled urea in
waterfall shape will meet the atomized melting urea from the sprayer,
and will be enlarged into granular ones until it reaches the required
size, and then go out of the drum. The special design makes the
fluidized air pressure much lower than that of the same technology
applied today in the West. The design of mechanical atomization
sprayer leaves out the air atomization. These two points are the
technical bases for energy saving in production.
*(2) Water Cooling Drum:
There is a water cooler installed in the drum. The special design
makes the patent equipments use water cooling instead of wind
cooling. Therefore, it has simplified the treatment process of the cool
wind polluted by the urea powder. This is the technical base of
energy saving in the cooling system.
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