Damper and EXPANSION JOINT Systems for Coal Fired Power Plants - - PowerPoint PPT Presentation

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, Hamon Research Cottrell, Doosan Babcock)

• End-User

(Southern Company Services, American Electric Power, Duke Energy…)

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

• r gas within the system.

Products In These Systems:

Front End – Pre- combustion Back-End Post-combustion

Front end

OFA 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 isolation

dampers

• Pressure – 20-25” w.g. (50-60 mbar)
• Wall casing thickness and reinforcements

designs to withstand the maximum pressure and prevent vibration due to turbine flow pulsations.

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 of

condensation / corrosion

• Designed with high nickel alloy material (C-276
• r AL6XN) and housing protected with

cladding on damper cold side subjected to corrosion

• 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 shipped

in sections and assembled on site with ease.

• EffoxFlextor supplies complete erection

and testing procedures along with erection/commissioning supervision all around 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