Engineered To Order

Damper and EXPANSION JOINT Systems for

Coal Fired Power Plants

Customers:

• Engineering / EPC (Burns & McDonnell, Stone & Webster,Black & Veatch, Sargent & Lundy…)

• OEM (Alstom, Babcock & Wilcox, HamonResearch Cottrell, Doosan Babcock)

• End-User (Southern Company Services, American Electric Power, DukeEnergy…)

What do the dampers do?

Direct and control air into or around the components upstream of the process.

Isolate process trains from each other. Direct and control combustion gasses into and

around components downstream of the process and into the stack.

What do the Expansion Joints do?

Allow the ductwork and components around the process to move independently of each other to prevent thermal stresses while still containing the air or gas within the system.

Products In These Systems:Front End – Pre-

combustionBack-End

Post-combustion

Front endOFA SA

Hot PA Cold PA

FD Fan PA Fan

Air Heater

Pulverizers

Boiler Furnace

Operating Parameters – Front-End Key Selling Features:

• Temperature – 100 F to 750 F (40-400 C)

• Low Velocities – 2,500-3,000 FPM (13-15 m/s)

• Some coal dust loading in flow• Quick acting actuation on pulverizer isolationdampers

• Pressure – 20-25” w.g. (50-60 mbar)

• Wall casing thickness and reinforcementsdesigns to withstand the maximum pressureand prevent vibration due to turbine flowpulsations.

Operating Parameters – Front-End Key Selling Features:

Back end

Economizer

Bypass

Boiler

Economizer

FGD

ESP

Stack

SCR

Operating Parameters – Back-End Key Selling Features:

• Temperature – 100 F to 750 F (40-400 C)

• Low Velocities – 2,500-3,000 FPM (13-15 m/s)

• Large damper sizes• Fly Ash dust loading in flow

Operating Parameters – Back-End Key Selling Features:

• Presence of SO2 – Risk ofcondensation / corrosion

• Designed with high nickel alloy material (C-276or AL6XN) and housing protected withcladding on damper cold side subjected tocorrosion

• Seal air (when needed).

Selective Catalytic Reduction: SCR Dampers

Temp of 600-700 F High dust loading Large sizes Thermal challenges Requirement for tight

shut-off

Flue Gas Desulphurization: FGD Dampers

Temperature 175-400F Leakage of low 1-2% to Tight-Shut-Off

- 0.5% to 0% Guillotine dampers for isolation Louvers for isolation or flow control Very High corrosion

• Large dampers designed to be shippedin sections and assembled on site withease.

• EffoxFlextor supplies complete erectionand testing procedures along witherection/commissioning supervision allaround the world.

Operating Parameters – Back-End Key Selling Features:

Major References – Coal Systems:

Saudi Electric Company Southern Company Services American Electric Power Duke Energy Luminant Energy Kansas City Power & Light Shenzhen West, China PT Paiton, Indonesia Ratchaburi, Thailand