Attachment 1

Iatan Presentation
April 28, 2010 

Kansas City Power & Light Co

Iatan Generation Station

April 28, 2010

Paul Ling – Environmental Mana

Gary Brown – Station AQC Superin

Nick Voris – Station AQC Engin

Tom Mackin – Station Manag
April 28, 2010 

KCP&L Iatan Generation Sta

Site Location

Iatan 

Generation 

Station
April 28, 2010 

KCP&L Iatan Generation Sta

Station Introduction

Unit Year Completed Location Fuel Net MW KCP&L MW GMO MW GPE MW Operator 

Iatan 1 1980 Iatan, MO PRB 705 494 127 620 Kansas City Power & 

70% 18% 88%

Iatan 2 2010 Iatan, MO PRB 850 465 153 618 Kansas City Power & 

54.7% 18% 72.7% 

Iatan Unit 1Retrofit installation of a new air quality control system (SCR, FGDexisting sub-critical pulverized coal generating unit optimizing use infrastructure.Iatan Unit 2New 850 MW super critical pulverized coal generating unit with ncontrol system (SCR, FGD, Baghouse) in initial startup.
April 28, 2010 

KCP&L Iatan Generation Sta

Air Quality Control Equipm
April 28, 2010 

KCP&L Iatan Generation Sta

Aerial 
April 28, 2010 

KCP&L Iatan Generation Sta

Station Site Layout Drawin
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KCP&L Iatan Generation Sta

Generation Area Site Layout D
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KCP&L Iatan Generation Sta

ZLD Area Site Layout Draw
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KCP&L Iatan Generation Sta

ZLD Area Site Layout Draw
April 28, 2010 

KCP&L Iatan Generation Sta

NPDES Station Outfall Draw
April 28, 2010 

KCP&L Iatan Generation Sta

Station NPDES Operating Pe

NPDES Operating Permit MO-0082996

Outfall 001 – once through coolingOutfall 002 – sanitary water treatment plantOutfall 003 – washdown, blowdown, backwash, coal pile r

stormwater runoff

Outfall 007 & 008 – stormwater runoff

NPDES Operating Permit MO-0135062

Outfall 010 – utility waste landfill leachate collection pondOutfall 011 - utility waste landfill stormwater collection pon
April 28, 2010 

KCP&L Iatan Generation Sta

Bottom Ash Handling

Bottom Ash – Units 1 & 2• Submerged flight conveyor removes wet pyrites, bottom as

ash from the water impoundment directly underneath the bo

• Ash is continuously removed and discharged into the bottom • Ash is loaded from the bottom ash bunker into trucks and b

offsite or deposited in the onsite landfill.

• Submerged flight conveyor drain system collects area drain

water back to system or other systems in the plant.

• Overflow drains from the submerged flight conveyor system 

overflow tank and ultimately to the Unit 2 cooling tower blow
April 28, 2010 

KCP&L Iatan Generation Sta

Bottom Ash Handling

Unit 1Bottom Ash – Submerged Flight Conveyor

BB
April 28, 2010 

KCP&L Iatan Generation Sta

Fly Ash Handling

Fly Ash – Units 1 & 2• Dry fly ash is transferred pneumatically from the baghouse 

ash storage silo.

• Fly ash is either unload through a wet ash conditioner for tr

deposited in the onsite landfill or dry to trucks for beneficial 

• The wet ash conditioner uses service water or brine from th

control.
April 28, 2010 

KCP&L Iatan Generation Sta

Gypsum Handling

Gypsum – Units 1 & 2• Gypsum is conveyed from the rotary drum vacuum filter in t

system to the gypsum stack out.

• Gypsum can emergency stack out or longer-term radial pile 
April 28, 2010 

KCP&L Iatan Generation Sta

Gypsum Handling

Gypsum Radial Stack Out Pile

Gypsum Eme
April 28, 2010 

KCP&L Iatan Generation Sta

FGD - Absorber

FGD - Absorber – Units 1 & 2• The absorber is a large vessel consisting of a spray tower a

utilizing limestone slurry to chemically react with the flue ga

• The slurry from the reaction tank is continuously pumped by 

spray headers in the absorber.

• The recycle slurry, composed of gypsum and limestone, is 

reaction tank to the hydrocyclone classifier when the slurry high point. 

• The hydrocyclone classifier separates the feed into overflow 

• The overflow, which is lower in solids concentration, is direc

water system.

• The underflow, which is higher in solids concentration, is di

dewatering system.

• The absorber reaction tank receives relatively clean water f

including cooling tower blowdown or service water, mist elimand reclaim water system.
April 28, 2010 

KCP&L Iatan Generation Sta

FGD - Absorber

Unit 1 FGD

Recycle 
April 28, 2010 

KCP&L Iatan Generation Sta

FGD – Reclaim Water

FGD – Reclaim Water – Units 1 & 2• The reclaim water system stores discharge water from vario

reducing demand for makeup water for the FGDs.

• The reclaimed water comes from:

– Filtrate and washwater from gypsum dewatering– Hydrocyclone classifier overflow– Absorber, limestone preparation, and bottom ash stora

– Cooling tower blowdown
April 28, 2010 

KCP&L Iatan Generation Sta

FGD – Reclaim Water

Reclaim Water Tank
April 28, 2010 

KCP&L Iatan Generation Sta

FGD – Gypsum Dewaterin

FGD – Gypsum Dewatering – Units 1 & 2• The gypsum dewatering system functions to filter the gypsu

filter cake that is low in moisture and a filtrate that is re-usereclaim water system.

• Filter feed tanks feed the two rotary drum vacuum filters.

• In the rotary drum vacuum filter a vacuum is applied across 

removing most of the liquid from the slurry leaving the filter 

• The filter cake is removed from the rotary drum and convey

stack out conveyors.
April 28, 2010 

KCP&L Iatan Generation Sta

FGD – Gypsum Dewaterin

Rotary Drum Vacuum Filter
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KCP&L Iatan Generation Sta

Water Balance
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KCP&L Iatan Generation Sta

ZLD – Mechanical Dewater

ZLD – Mechanical Dewatering – Units 1 & 2• The FGD blowdown is directed from the FGD reclaim tanks 

wastewater storage (FGD blowdown) tank or the ZLD back

• The wastewater solids are removed in the metal removal cl

addition of coagulant and polyelectrolyte.

• The metal removal clarifier sludge is pumped to the sludge 

decantation in the thickener is directed to the thickener ove

• The solids from the sludge thickener are mixed with a polym

with the belt filter press.

• The filter cake from the belt filter press is conveyed to the Z

building and loaded into trucks for disposal in the onsite lan

• The overflow from the metal removal clarifier is directed to 

tank where it is pH adjusted and treated with an anti-scale.
April 28, 2010 

KCP&L Iatan Generation Sta

ZLD – Mechanical Dewater

ZLD Wastewater Storage (FGD Blowdown) Tank, Metal RemoWaste Brine Holding Tank (left to right)

ZLD Backup H
April 28, 2010 

KCP&L Iatan Generation Sta

ZLD – Mechanical Dewater

ZLD Cake 

ZLD Cake Stack Out Conveyor
April 28, 2010 

KCP&L Iatan Generation Sta

ZLD – Evaporator

ZLD – Evaporator – Units 1 & 2• The wastewater from the evaporator feed tank is directed th

heat exchangers and deaerator to the seeded falling film ev

• The wastewater is recirculated from the sump to the top of 

bundle. Anti-foam and caustic injection points are located iloop. 

• A side stream flow through a small hydrocyclone is used to 

concentrated waste brine from the evaporator. The overflobrine holding tanks and ultimately to the fly ash silo conditio
April 28, 2010 

KCP&L Iatan Generation Sta

ZLD – Evaporator

ZLD Building

Chemical Feeds
April 28, 2010 

KCP&L Iatan Generation Sta

ZLD – Evaporator

Evaporator Heat Exchanger Falling Film E
Attachment 2 

Iatan FGD System Process Flow Diagram 
[Confidential Business Information has been removed from this document.]
Attachment 3 

Iatan FGD Wastewater Treatment System Process Flow Diagrams 
[Confidential Business Information has been removed from this document.]