There are various forms of drying equipments. Commonly used dryer machine in the cement industry includes rotary dryer,
flow pattern dryer, stirring drying positive airflow drying tube.
In
recent years the spray drying devices are still studied at home and
abroad.
These devices generally use the convection of hot flue gas to
dry materials.
Drying operation can go together with crushing operation and powder selecting operation.
At present, the coal powder equipments in cement plant
make use of the drying and power grinding system.
In recent years,
using the drying and power grinding system in raw cement becomes more
and more at home and abroad.
This way can simplify the processing flow
and decrease energy consumption.
But if the moisture of raw materials is
over the limit of drying and powder grinding system, another dryer is
needed to preheat the materials.
All in all, the drying process is one
of the basic heating procedures, and the drying procedure can directly
influence the quality of cement.
Therefore, great attention must be paid
to the drying equipments.
Within the rotary dryer, there are concurrent and counter-flow type according to the differences of the flowing direction of materials and hot gas.
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Within the rotary dryer, there are concurrent and counter-flow type according to the differences of the flowing direction of materials and hot gas.
The flowing direction of materials and hot gas is same within
the concurrent dryer, and in the feeding part, wet materials contact
with hot gas, so the drying speed is fast, but in the discharging part,
because the materials are easy to be dried and their temperature is
raised, and the difference in temperature between them is small, so the
drying ratio within the whole cylinder is uneven.
However, the flowing
direction of materials and hot gas within the counter-flow dryer is
reverse, and the dried materials contact with hot gas with high
temperature and low moisture, so the drying ratio of the whole cylinder
is much even.
