World Grain - September 2022 - 83

terial usually experiences a " roasting process, " which
releases various fire gas precursors. The phase from
warming through to roasting can be lengthy, presenting
an opportunity to detect overheating by the pre-combustion
gases. Most commonly, carbon monoxide detection
is used for organic drying fire prevention monitoring.
To be reliable with only monitoring one gas, a highperformance
analyzer is needed. With the understanding
that additional gases such as hydrogen, nitrogen
oxides and hydrocarbon compounds also are produced
during the roasting stage, a semiconductor-based multigas
detector can provide additional detection reliability.
Gas monitoring in a central duct such as dryer exhaust
duct or aspiration filter exhaust duct adds extended
detection coverage beyond the primary equipment
to the connected upstream machines and work areas.
What happens after detection?
Each of the above-mentioned situations requires a tailored
solution to manage the insipient ignition source
from developing into a hazardous situation. This may
include a combination of water deluge, system shutdown,
bypass or operator intervention for example.
If a critical situation is detected,
a predefined communication
and action is needed
to inform and react on the
next steps.
Equally important, the
selection, placement and
calibration of early detection
explosion prevention
systems must be coordinated
and configured for
optimum reliability. This is important to
prevent nuisance false alarms and complacency
toward detection events as the moments after a real occurrence
are vital to neutralizing the ignition as part of
the preventive explosion safety solution.
Alexander Kemmling is a sales executive in explosion prevention
for Rembe. He may be reached at Alexander.Kemmling@rembe.de.
Jeramy Slaunwhite is senior explosion safety engineer for Rembe. He
may be reached at Jeramy.Slaunwhite@rembe.us.
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* Grain and Grain Product Quality
* Blending, Cleaning and
Conditioning
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Development
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