Page 17 - Chemical Technology
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Chemical Technology • January 2013
FOCUS
on control and instrumentation engineering
With the increasing demand
from the power industry to achieve better combustion perfor-
mance and fuel economy, M&W Asketeknik has developed the ACFM-2200 Automatic Coal
Flow Monitor in close cooperation with specialists from coal-fired power utilities.
The ACFM-2200 is a fully automatic monitoring and sampling unit, which collects pulver-
ized coal samples from pneumatic transport pipes between mills and burners. The measur-
ing results are transmitted to the control room for evaluation and control of the coal flow.
The sampling operation is carried out according to the international ISO standard 9931.
Typical applications include routine flow measurements, adjustment of fuel distribution,
sampling of coal, monitoring of pulverizing distribution settings in connection with low-NOx
burners and test firing of new coal types.
The sampling unit consists of a motorized rotating sampler arm with four coal extraction
nozzles. The measuring unit separates the coal particles from the extracted gas stream and
collects them in a measuring tube where the volume is measured by a fibre optics measur-
ing device.
The control unit supervises the function of all components and converts the measur-
ing signals for display on the operator’s panel (facilities for remote indication is available).
The operator’s panel allows easy access to mode selection, change of parameters etc. as
well as display of error messages. The control unit can operate up to eight sampling and
measuring units according to requirement.
M&W Asketeknik is represented locally by OEN Enterprises.
The new guided radar sensor
from
VEGA, the VEGAFLEX 82 with innovative
features offers a new quality when it
comes to reliability and measurement
certainty for bulk solids, even for appli-
cations in silos up to 75 m high and for
solids with low reflectivity.
Thanks to its new automatic probe
end tracking function, VEGAFLEX 82
measures the levels of bulk solids with a
low dielectric constant of 1,1 and higher,
with unprecedented reliability. When
there is an increasingly unreliable prod-
uct signal, the sensor switches automati-
cally to the stable probe end tracking
signal, which is always proportional to
the level. This guarantees accurate,
consistent readings, especially with criti-
cal products such as plastic powder. The
sensor is thus able to adapt to changing
conditions, delivering a new quality in
measurement certainty and reliability.
If large amounts of buildup form on
the measuring probe, another innova-
tive feature takes effect: dynamic false
echo suppression. In such applications
the signal processing system adapts
itself automatically to the process
conditions and increases measurement
certainty. VEGAFLEX 82 is suitable for
Automatic coal flow monitor and
sampling unit available locally
For more information contact: Mike Andrews on tel: +27 11 675 4447;
email:
; or go to
Guided radar for level measurement of bulk solids
For more information contact
John Groom on +27 11 795 3249;
or email:
level measurement in almost all bulk
solids. It delivers reliable measurement
data in process temperatures from -40 to
+200° C and process pressures from -1 to
+40 bar. Its applications range from large-
volume bunkers to 75 m-high silos, from
light, fine powders to coarse, heavy gravel.
As a member of the plics
®
family, the sen-
sor combines all the advantages of VEGA’s
sensor concept: robust designs in cable
and rod versions, standardized process
fittings and a wide variety of housing and
electronics versions.
The VEGAFLEX 82 sensors are supplied
already calibrated. For specific settings on
site, the quick-start function guides the
user through the setup menus in a few
easy-to-follow steps.
VEGAFLEX 82 is equipped with asset
management functions according to NE
107 for simple diagnostics and preven-
tive maintenance. Beside the level, the
instrument also continuously transmits
the dielectric constant of the bulk mate-
rial, giving an indication of its moisture
content. In addition, measurement data,
events and echo curves are stored perma-
nently in the sensor electronics.
The sensors have all necessary ap-
provals such as ATEX, FM and SIL2/3 as a
matter of course.
