POWER May 2011 - 81

HEALTH & SAFETY
doors are normally closed and hold dust, fire,
and explosion from spreading into adjacent
areas. This is also true for closed-tube conveyor
galleries.
Ignition Control. Some plants have
ignition control tools that have been designed
and well thought out by the original
designer; however, the majority of power
generation facilities hold inadequate plans
showing hazardous locations by expressing
electrical classifications on a plan view or
site plan, usually via crosshatch patterns.
Many plants have plans with verbiage that
explains the intent or design parameters of
the electrical engineer who originally built
the facility.
OSHA expects to be provided with a
clear and concise drawing that designates
these areas. Inspecting these areas by referring
to the hazardous area classification
drawings is a critical step during the assessment.
Fire
Suppression. Follow the " Best
Practices for Fire Suppression Systems "
developed by the PRBCUG to ensure you
can achieve the best results in responding
to fires and explosions. (Go to www.
prbcoals.com for PRBCUG membership
information.) Protectowire (a linear heat
5. Taming the black beast. Dust suppression is achieved by applying the right chemical
at the right location. Courtesy: Benetech Inc.
detector used above conveyors) distribution
and water piping nozzles are vital to
the effectiveness of fire suppression.
Control Technologies for
Combustible Dust
Mitigation of dust emissions as delineated
in the Environmental Protection Agency's
(EPA) " Standards of Performance for Coal
Preparation and Processing Plants " (40
Code of Federal Regulations 60 Subpart Y)
has been redefined. The preamble of EPA's
Subpart Y clearly states that dry dust collectors
and subbituminous coal dust are an
unhealthy combination due to the hazards of
storing explosive coal fines in the hopper and
dumping such fines back into the system. All
the systems listed below have been cleared
for use as best available control technology
when replacing dry dust collectors:
■ Wet scrubbers do not store coal in a dry
and dangerous state. Instead, the coal is
impinged with water and falls out into a
wet discharge stream.
■ Special transfers and passive chutes
channel the material for less wear on the
belt and curtail entrained air. (One of the
New Edition!
Platts 2011 UDI Who's Who at Electric Power Plants Directory
With the 2011 UDI Who's Who
Directory, you can:
* Connect with key power
plant personnel at more
than 4,000 power plant sites
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The UDI Who's Who at Electric Power Plants Directory is the defi nitive reference for the
North American electric power sector. It includes:
* Power plant design characteristics
* Nearly 8,500 plant management and support contact names, titles,
and primary job functions
* Basic plant operating statistics for more than 1,500 power stations, including:
- Generation (MWh)
- Availability (%)
- Heat rate
- Capacity Factor (%)
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To purchase, visit www.udidata.platts.com
80
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POWER May 2011

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