April 27, 2010

USEPA Steam Electric EGL Site Visit 

Safety Briefing
USEPA / AmerenEnergy Resour

Generating Company

Duck Creek Power Plant

Steam Electric EGL Site Visit

April 27, 2010
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Agenda

 Introductions Safety Briefing Presentation Plant Tour Summary
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Ameren Corporation

 Ameren UE

 Generation (~10,400MW) Electric and Gas Distribution Transmission

 Ameren Illinois Utilities

 Electric and Gas Distribution Transmission

 Ameren Services AmerenEnergy Resources 

Company

 AmerenEnergy Generating 

Company (~4,225MW)

 AmerenEnergy Resources 

Generating (~1,125MW)
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Duck Creek Power Plant Overv

 One coal-fired steamgenerating unit:

465 MW, nominal430 MW, net

 Commerical 

Operation: 1976

 Non-rate regulated MISO market area
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Air Pollution Control Equipment Ov

 Selective catalytic reduction (SCR) system insta

2003 for NOx reduction 

 New Low NOx burners (LNB) installed in 2007 f

reduction

 New combustion management system installed 

for NOx and CO control

 New Electrostatic Precipitator (ESP) in service M

2009 for particulate control

 New Wet Flue Gas Desulphurization (WFGD) sy

service March 2009 for SO2 control

 New concrete chimney installed as part of FGD  New continuous emission monitoring system (C

installed and certified in March 2009
April 27, 2010

USEPA Steam Electric EGL Site Visit 

 Hitachi Counter Current Open Spr

Tower (first in US)

 Absorber Recycle Pump Design

 Continuous recirculation Absorber slurry – pH-5.8, density-70 SO2 removal – 95%

 Closed-loop system

Wet Flue Gas Desulphurization Sy
April 27, 2010

USEPA Steam Electric EGL Site Visit 

WFGD System General Informat

 FGD Type

 Spray Tower Forced Oxidation Horizontal Wet Ball Mill

 Absorber materials

 Flake Glass Lined, Carbon Steel Reagent = limestone 
April 27, 2010

USEPA Steam Electric EGL Site Visit 

WFGD System
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Fly Ash Handling System

 Retrofit during 2005-2006 Major components

 PLC Hoppers Vacuum pumps Transport line Ash storage silos

 Transported to on-site landfill or 

beneficial use
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Fly Ash Handling Overview
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Fly Ash Handling Overview
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Duck Creek Wastewater Managem

 WFGD Bottom ash Low volume Landfill runoff/leachate Gypsum stack runoff/leachate Coal pile runoff
April 27, 2010

USEPA Steam Electric EGL Site Visit 

WFGD Products

Mass Conservation Fundamental: What goes in...

 Post-precipitator combustion gas Limestone Water

 ...must go out

 Gypsum slurry Scrubbed gas and water vapor
April 27, 2010

USEPA Steam Electric EGL Site Visit 

WFGD Wastewater Manageme

GMF Gypsum Stack

 Size: ~30 acres Designed to be closed in place Groundwater monitoring Part of zero discharge GMF Major functions

 WW treatment during WFGD operation WFGD surge volume

 Concept

 Gypsum sluiced from WFGD Settled gypsum in active cell, decant water to recla Clarified reclaim pond water returned to WFGD
April 27, 2010

USEPA Steam Electric EGL Site Visit 

WFGD WW Overview
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Gypsum Stack Liner Cross Sect
April 27, 2010

USEPA Steam Electric EGL Site Visit 

WFGD Wastewater Manageme

GMF Reclaim Pond

 Size: ~10 acres Contributing flows

 Gypsum stack decant Stormwater runoff from gypsum stac Landfill leachate Gypsum stack leachate

 Groundwater monitoring Part of closed loop GMF
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Bottom Ash Wastewater Managem

 Began operation in 2008 Major components

 Two Primary Settling Basins Secondary Settling Pond

 Basins: 12” clay, 60mil Geomembrane, 8” conc

 Bottom Ash Laydown Area

 Bottom ash (2.03MGD) and low-volume 

treatment (1.20MGD)

 100% Beneficial use (on-site landfill alt
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Bottom Ash Wastewater Managem

 Basin design Source water & discharge Solids management
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Bottom Ash Basin Cross Sec
April 27, 2010

USEPA Steam Electric EGL Site Visit 

“Low-volume” Wastewater Manage

 Major Components

 Boiler room sump (0.3MGD) Turbine room sump (0.3MGD) Water treatment room sump (0.6MG STP (0.004MGD)

 Treated in Bottom Ash Settling Ba
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Landfill Wastewater Managem

 Stormwater runoff

 Reservoir for treatment

 Leachate

 Dust control Zero discharge GMF
April 27, 2010

USEPA Steam Electric EGL Site Visit 

GMF Wastewater Manageme

 Stormwater runoff design consideration

 12-week plant outage

 No return to WFGD Assume max 12-week precipitation on record (

 0.5PMP (16.25”) 24H storm event ...and 900,000ft3 of additional sediment/st

area

 Leachate

 Gypsum stack returned to GMF
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Coal Pile Runoff Wastewater 

Management

 Coal (and limestone) storage Ditch collection system Reservoir
April 27, 2010

USEPA Steam Electric EGL Site Visit 

NPDES Permit IL0055620 Outf

 001 – Dam Seepage Collection Sy 002 – Cooling Pond Overflow (el 5 003 – River Intake Screen Backwa 004 – Cooling Pond Overflow (el 5
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Outfall Location Map

001 & 002

003004
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Plant Tour

 Air pollution control overview – ESP

SCR, FGD

 FGD Process Overview Gypsum Management Facility (GM Landfill
April 27, 2010

USEPA Steam Electric EGL Site Visit 

Duck Creek Power Plant

Site Visit - Summary

 Comments and questions Action Items