Page 9 - GlobalEyes Edition 6 Dec 2011

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installed trial product into
the last of Eskom’s coal fired
power stations, Grootvlei.
The first performance results
from this trial are expected
in the next four months.
Data gathered from these
mills will be used to further
improve the design of the
grinding components to
ensure consistent wear.
This information can also
be used for determining
product warranties in new
markets where similar
mills and coal are used.
Using its depth of
knowledge and expertise
in the manufacture of wear
consumables, Bradken
strives to cross market and
industry boundaries and
develop innovative product
solutions for customers
all over the world.
in Mpumalanga, South
Africa, to be overseen by
Herman Bosman and the
team at Bradken’s Jet Park,
Johannesburg sales facility.
Eskom is the largest producer
of electricity in South Africa.
Of their total power output,
90% is produced by coal
fired power stations, six of
which used steel ring and
ball technology to pulverise
coal for electricity generation.
The success of this trial saw
Bradken awarded a five year
contract to supply rings and
balls for all 32 mills at the site.
On the back of this
achievement trials were
commenced at a further four
of Eskom’s facilities; Komati,
Matla, Dhuva and Hendrina,
with the product reported
to be performing very well.
In August, Bradken
successfully delivered and
Bradken offers a range of
products into the vertical
grinding mill market,
supplying balls and rings,
along with spiders, integral
rotating throats, detachable
rotating throats and mill floors.
Bradken’s UK based
product development team
identified that the use of
steel rings and balls in
South Africa’s coal fired
power stations was limiting
wear life and potentially
leading to excessive
downtime for replacement
and maintenance.
Sales and Marketing
Manager for Bradken in
Sheffield, Mathew Marsh
said that the use of these
products was impractical
as the abrasive coal used
in South African power
stations caused them to wear
out quickly and unevenly.
“Typically for every set of
worn rings the customer
would wear out three sets
of balls. So every time a set
of balls wore out they would
need to open the pulveriser
mill, remove the worn balls
and insert a new set.
“This could take several
days to undertake, meaning
lost time for power
generation,” Mathew said.
Taking this on board,
Bradken developed a
solution based on existing
ring and ball technology
that ensured equal wear
life for the rings and balls
through improved design
and the use of a variety of
high chrome iron materials.
After a slow initial uptake,
Bradken secured a two
year trial of the product
at the Eskom owned Kriel
Power Station, located
Workers unload rings to be trialled at Eskom's Grootvlei Power Station
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