REVISTA ROMÂNĂ DE AUTOMATICĂ - IPA SA

REVISTA ROMÂNĂ DE AUTOMATICĂ
3
The pre-batcher meets both requirements of
capability (productivity, precision dosage,
possible adjustment of recipes for different
asphalt mixtures, run in automatically) and
the requirements of security and
environmental protection.
After experimental research it was developed
productivity chart (fig.2) of the pre-batcher
having Φ 219mm drums at the extracting
bands and with the transmission of i= 40.
The batching gravimetric system for natural
dry aggregates and of the cold filler has a
weighing error less than 1%, within SR
7970:2001[4].
The gravimetric batcher system for hot
bitumen (fig.3) has an weighing error less
than 1%, falling into the limits SR
7970:2001[4].
Regarding automation equipment, its prebatching
and batching functions of the pilot
of the central for the preparation of mixtures
CEMA 15, achieved both by running and
optimizing its implemented software system,
are according the technical requirements
provided for operating the pilot phase.
Fig. 2 The productivity chart of the pre-batcher system
2. Experimental researches regarding the
preparation process for asphalt
mixtures
After the pre-batching a drying phase comes
in the technological process (max. 0,5%
humidity ) and the heating of natural
aggregates (175 -185 o C), a process
experimentally analysed in the dry drum
equipped with the automated burner GAS-G
4000 MN (table 1).
Fig. 3 System for weighing with precision of the hot
bitumen binder
(Thermo-insulated recipient , on three load cells+
recirculation/watering pumps + numerical mass
indicator)
Table 1
Process parameters of burner GAS-G 4000MN
Progressive
Gas
flow of
pressure
gaseous fuel
(mbar)
(m 3 /h)
De-pressure at the Differential Burnt gas composition
frontal plate of the de-pressure
dryer I/O filter sacs
CO 2 CO
(mmH 2 O) (cmH 2 O)
(%) ppm
60 ... 200 200...125 5...3 10...14 11...12 2...3 1,24...1,25
O 2
(%)