### Babcock Power Environmental Inc., a Babcock Power Inc. company, provides fully integrated environmental solutions for utility power plants, waste-to-energy facilities, and large industrial applications worldwide. With more than 30 years of experience in designing and installing Wet Flue Gas Desulfurization (WFGD) systems, Babcock Power Environmental Inc. can apply its technology and experience to upgrade any OEM’s WFGD system. Babcock Power Environmental upgrades existing scrubbers to meet today’s more stringent emissions regulations and achieve higher performance levels. Typically, the intent is to increase SO 2 

### removal efficiency to 97-99%, while minimizing additional pressure drop and energy consumption. WFGD scrubber upgrades normally involve applying new technology to existing systems to achieve optimal efficiency. Initially, an understanding of current problems is essential. Older models often have poor gas distribution and fail to remove significant amounts of SO 2 

### . They also present inefficient spray patterns over the cross section of the absorber. Babcock Power Environmental can successfully overcome these problems by utilizing its world-leading technology and experience.

Contact Babcock Power Environmental Inc. to meet emissions regulations and improve the efficiency of your WFGD

. 

# TECHNICAL OVERVIEW Wet Flue Gas Desulfurization Scrubber Upgrades

Babcock Power Environmental Inc. www.babcockpower.com 

## Benefits Scrubber Upgrades

• Low cost solution vs. new installation

• Catch up on 20 y ears of technology

• Meet toda y’s requirements with yesterday’s dollars

• Higher SO 2 reduction with improv ed

ener gy efficiency 

## CFD Modeling

• Results in better gas distribution

• Simulates dr oplets and full spray coverage over absorber(s)

• Ensur es proper flow along walls

• Identifies ar eas requiring additional nozzles for
pr oper liquid and gas distribution 

## Bidirectional Nozzles Installed

• W ider-angle spray cone ensures efficient spray pattern thr ough the spray zone

• Incr ease gas - liquid collisions

• Dual dir ection allows for complete coverage
thr oughout the total spray zone 

## Wall Baffles

• Impr ove distribution of flue gas over entire

cr oss section

• Reduce “gas sneakage” along absorber walls and corners

• Minimize pr essure drop

*Delta Wings furnished utilize technology under an exclusive license with Balcke-Dürr GmbH and from other Babcock Power Inc. proprietary sources.

Bidirectional Spray Nozzles Bidirectional Spray Nozzles Wall Rings a Babcock Power Inc. company

## Strategic Process The process begins with a complete analysis of the existing system design and performance. Physical and Computational Fluid Dynamics (CFD) flow modeling follow this to optimize inlet gas distribution and limit the amount of slurry deposition on the inlet duct. Slurry spray nozzle tests are then conducted to ensure new nozzles will have similar flow and pressure criteria. Bidirectional nozzles, however, will be installed regardless of the original design, with wider-angle spray cones to provide complete coverage of the spray zone and increased gas-liquid collisions. Wall baffles are designed and installed in each absorber to direct and better distribute flue gas over the entire cross section of the absorber, as well as minimize or eliminate “gas sneakage” along the absorber walls and corners. These strategic steps improve gas flow distribution and liquid-to-gas contact, ultimately increasing the absorber’s effectiveness in removing SO 2 

### from the flue gas.

Babcock Power Environmental Inc. • 5 Neponset Street, PO Box 15404, Worcester, MA 01615-0040 tel: 508-852-7100 • www .babcockpower.com 

# TECHNICAL OVERVIEW Wet Flue Gas Desulfurization Scrubber Upgrades

BPE-TO-0011-v3-201 3 Unit Flue Gas SO 2 , lb/MBtu Starting SO 2 , Efficiency Upgrade SO 2 , Efficiency

550 MW 6.5 -91 % >99%

390 MW 8.0 93.5 % ~98 %

2 x 600 MW 2.0 <94% ~98%

Note: Coal type remained the same as original for all three projects

Safety 3 People. Power. Projects. We’re giving safety the third degree. Babcock Power Inc. and its subsidiaries place the safety, health and security of our people at the core of our company values. Our team is our most valuable resource, generating solutions everyday to deliver safe, clean, reliable energy globally. With a keen focus on safety, Babcock Power Inc. conducts business in a manner that protects our people, our customers and the environment. From innovation to generation, we are proud of our award-winning safety record and are committed to operating with integrity and excellence.
The data contained herein is solely for your information and is not offered, or to be construed, as a warranty or contractual responsibility. © Babcock Power Environmental Inc., 2013 a Babcock Power Inc. company