Commercial Operation
January 15, 1991
OVER 15 Years
Without a Lost Time Accident
Days Since Last Lost Time Accident
Total Work Hours Since Last Lost
Time Accident
5,760
3,203,362
At AES Safety is First
Key Plant Data Points
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Electric contract under the Public Utility
Regulatory Policy Act (PURPA) of 1978
Commercial Operations – January 1991
Net plant capacity 320 MW
Utilizes 65% of all state coal produced
Utilizes clean coal technology
Largest single private investment in
Oklahoma at $480M until Red Bud in 2002
Fuel & Economic Impact
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Utilizes 65% of all Oklahoma coal produced and
some PRB
Local coal utilization creates 1500 – 2000 direct
and indirect rural jobs in area
Plant payroll / benefits over $15M annually
Overall financial impact of $48M annually to the
local area from local coal purchases and buying
locally whenever possible
Material Handling
• Approximately 275 trucks per day hauling coal, limestone & ash
• 3,000 Tons of Coal per day
• 1,000 Tons of Limestone per day
Plant Technology
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Utilizes Circulating Fluidized Bed (CFB)
combustion technology
Results in lower sulfur dioxide and nitrogen
oxides emissions while firing at lower
temperatures (1500 F) than a conventional
Pulverized Coal plant
Combustion gas reaction with limestone for
sulfur dioxide capture while firing coal
…Plant Technology
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Emissions are controlled within the four
boilers, no add-on flue gas treatment is
required
Fabric filter bags (4 bag houses with
12,000 bags each) allow for an extremely
high degree of particulate removal
Results in no visible emissions from stack
Emissions Stack
• NOX Normally runs < 75% of Limit
• Opacity Normally runs < 20% of
• Limit SO2 Normally runs < 80% of Limit
AES Customers
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Supplying clean, safe and reliable electricity to
Oklahoma Gas & Electric
Plant contract availability 99%
Net 320 MW
CO2 sold to Continental Carbonic and prior to
Tyson Foods
CO2 plant availability 98%
200 tons liquid food-grade / 40 tons dry ice
Carbon Dioxide Area
ABB Lummus Crest CO2
Recovery Process Design
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ABB licensed the proprietary design required for
this plant from its original developer, KerrMcGee, Oklahoma City
At the time it was common to extract food-grade
carbon dioxide (CO2) from the exhaust gas of
coal-fired plants in Russia.
CO2 Recovery Process
The Technical Challenge
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The Challenge was to create a process of
taking a gas, turning it into a liquid, that is
of food-grade quality along with being safe
for shipping food for human consumption
AES Shady Point became the first plant in the United
States to successfully produce a food-grade product
from utilizing a fossil fuel
Approximately 5% of
the flue gas is diverted
from the power plant
for the CO2 process
Flue gas compressed with centrifugal blowers for
transport to the CO2 plant
First step involves the flue gas passing through a
quencher to reduce gas temperatures from 325 F to
approximately 106 F
Cooled gas travels through the scrubber to
remove sulfur oxides
Cool & cleaned flue gas then enters
the absorber tower where CO2 is
removed by a counter-current flow
(gas and liquid separated at this
point) of monoethanolamine (MEA)
solution
CO2 rich MEA solution pumped to
a CO2 stripper and boiled at 75 psi
to strip out all CO2
Stripped MEA is cooled and
pumped back to the absorber tower
as lean MEA with no CO2 particles
present (closed loop system)
CO2 gas is compressed, liquefied and
purified (in a proprietary process) where all
sulfur compounds, amine, oil, ammonia,
oxides of nitrogen are removed
Lastly, gas is liquefied by cooling it to -12 F
and 300 psi and stored in three insulated
containers (bullets) prior to shipment at 200
tons per day production
Liquid CO2 is sent to a certified lab for
testing and verification of 99.9% pure
food-grade CO2 safe for packing food
for human consumption.
Approximately 40 tons of liquid food-grade CO2 is passed over
to a liquid flash tank to be pelletized and liquid pressure is
dropped to 60 psi and temperatures are reduced to -109 F,
producing solid food-grade CO2 or dry ice
Power Magazine Selects
AES Shady Point For
The 1992 Power Plant Award
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Criteria – Facilities representing leadership in the
application of fresh ideas and new technology
and equipment to maximize efficiency, minimize
environmental impact while demonstrating
technologies important to produce thermal and
electrical energy in a fuel-efficient and
environmentally sound manner
Awarded for applying reheat fluidized-bed boiler
technology and demonstrating CO2 recovery for
coal-fired power plants