POWER April 2012 - 62

PLANT COOLING
4. Lend a helping hand. A " helper " cooling tower with perhaps eight cells was found
to be the best economic option for the case study plant if it must operate under a downstream
river water temperature limitation of 120F. Source: Sargent & Lundy
500,000
450,000
400,000
350,000
300,000
250,000
200,000
150,000
100,000
50,000
5
rate analysis was performed to determine
the optimum number of cooling tower
cells required to produce a 109F and a
120F river water temperature downstream
of station discharge. When the discharge
requirement is 109F, adding more than
eight cooling tower cells (modules) provided
negligible economic benefit.
Not surprising, the site layout did not
10
Number of rental cooling tower cells
consider the future possibility of adding
a large cooling tower. Existing infrastructure
was carefully considered to properly
locate the new cooling tower as well as
to minimize installed and operating costs.
Options for converting all four units, as
well as only two of the units, were also
investigated. The ultimate recommended
tower location was different than that sug15
gested
by other consultants due to the potential
for icing of the switchyard. The new
location benefited from the ability to reuse
existing cooling water piping, although it
was directly adjacent to a busy haul road
and the coal pile.
After detailed discussions with tower
vendors, it was determined that as long as
a low clog-type tower fill was selected, the
amount of sludge to be removed during basin
cleanings would increase, but the dusty
location would not otherwise affect tower
performance. Furthermore, plume abatement
was required due to the proximity of
the tower to a nearby bridge, which could
experience dangerous fogging and icing
from a tower plume.
The proper design point for the plume
abatement system was selected and the
corresponding additional cost was included
in the project budget. The customer
now has a solid plan ready to implement
should regulators add new river water thermal
discharge and/or temperature limits to
the plant's NPDES permit in the future. ■
-Jeffrey S. Mallory, PE (jeffrey.s.mallory@
sargentlundy.com) is a project engineer I for
Sargent & Lundy.
Bioenergy
Wind
Solar
hydro
geothermal
WaSte to energy
ocean
octoBer 17-19, 2012
Hosted by:
Organized by:
OMNI SHOREHAM | WASHINGTON D.C.
www.retech2012.com
62
www.powermag.com
POWER | April 2012
Lost generation (MWh)

http://www.retech2012.com http://www.powermag.com

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
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