POWER April 2012 - 25

an overfill of material or indicate that
material is no longer flowing out of the
silo, signaling a stoppage. If the level
of coal in the silos gets low before the
blockage can be repaired, then the plant
must either reduce load or shut down to
clear the blockage.
Another problem when handling dusty
UNITED STATES
and dirty coal is its affinity for absorbing
moisture. Once coal becomes wet or
moist, a coating and buildup of a film
of coal on the surface of the chutes will
eventually block the flow through the
silo transport chutes. When chute blockage
occurs, it can create an overflow of
coal from the conveyor belts. Not only
does the blocked chute stop production,
but it also can cause severe injury to
plant personnel and result in fines by
state regulatory agencies. We have also
seen damage caused by plugged chutes
and the resulting overflow of coal from
conveyors to other process equipment.
Pick the Best Technology
With the potential for lost generation
and equipment damage caused by
blockages in fuel-handling systems, it's
surprising that more plants don't have
the instrumentation to sense impending
blockages. Many different types of
point level devices on the market today
are used for blockage detection and prevention
on coal transfer chutes, including
a variety of switch, microwave, and
acoustic wave technologies.
Switch Technology. Favorites are the
few switches that are sufficiently robust
to operate in these solids-handling applications
that operate 24/7. Whether
the technology is capacitance, vibra4.
Undercover switch. A mill cyclone
feed level switch covered with a coal ash coating
often causes a false trip. Courtesy: Hawk
Measurement Systems
Biomass Power Generation
UNITED STATES
CANADA
CANADA
SWEDEN
SWEDEN
Material Handling for
Biomass Handling Equipment
Complete Engineered Systems
Pulverized Coal Boiler Conversions
CFB Boiler Feed Systems
Silos
Wood Hogs
Disc Screens
Open Storage
Closed Storage
Truck Dumpers
USA: CORPORATE HEADQUARTERS
Jeffrey Rader Corporation
398 Willis Road
Woodruff, SC, USA 29388
Phone: 864.476.7523
Fax: 864.476.7510
CANADA: Vancouver, BC
Jeffrey Rader Canada
Unit 2, 62 Fawcett Road
Coquitlam, BC V3K 6V5 Canada
Phone: 604.299.0241
Fax: 604.299.1491
Chain Conveyors
Bucket Elevators
Screw Conveyors
Screw Reclaimers
Pneumatic Conveying
CANADA: Montreal, Quebec
Jeffrey Rader Canada
2350 Place Trans-Canadienne
Dorval, Quebec H9P 2X5 Canada
Phone: 514.822.2660
Fax: 514.822.2699
SWEDEN: Stockholm
Jeffrey Rader AB
Domnarvsgatan 11, 163 53 SPÅNGA
Stockholm, Sweden
Phone: +46 8 56 47 57 47
Fax: +46 8 56 47 57 48
For information on how Jeffrey Rader Corporation can solve your
Biomass Handling needs, visit us at www.jeffreyrader.com/pow
CIRCLE 14 ON READER SERVICE CARD
April 2012 | POWER
www.powermag.com
25

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POWER April 2012

Table of Contents for the Digital Edition of POWER April 2012

Contents
POWER April 2012 - Cover1
POWER April 2012 - Cover2
POWER April 2012 - Contents
POWER April 2012 - 2
POWER April 2012 - 3
POWER April 2012 - 4
POWER April 2012 - 5
POWER April 2012 - 6
POWER April 2012 - 7
POWER April 2012 - 8
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POWER April 2012 - Cover3
POWER April 2012 - Cover4
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