PWER/BPROS/TRMWBD10/eng/THS/09.10/CH/7268 © ALSTOM 2010. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. 

## AQCS Service SOLUTIONS 

# Wet Scrubber Upgrade Air Quality Control Systems

The technology to effectively reduce

your emission levels

E mission reduction: More stringent environmental regulations require improved solutions for exhaust flue gas cleaning. Alstom offers a full set of Wet Flue Gas Desulfurisation (FGD) Service solutions to upgrade your equipment to a high-tech design with optimum performance.

I ntegrated upgrade solutions: Alstom is committed to finding innovative solutions to existing Wet FGD systems with upgrades for increased performance and energy savings. As every Wet FGD system is unique, Alstom takes a tailored approach to determining the solution you need. We bring a full array of engineering expertise to the table to ensure that the solution meets your expectations for high performance, low energy consumption and reduced operating costs. 

# Alstom, one of the most trusted names in power generation, has all the experience and expertise to obtain the highest efficiencies with the lowest operating and maintenance costs.

R eliable solutions

Our customers can benefit from our upgrade solutions to reduce emissions and maintenance costs and extend the lifetime of existing equipment.

R educed emission Alstom offers a full set of upgrade solutions to meet your emission guarantee requirements.

Increased efficiency Alstom’s Wet FGD upgrade solutions includes optimising layout of spray headers and installation of wall rings to increase gas to liquid contact, for optimum efficiency of your systems.

Lower energy consumption Alstom’s new nozzle types and pumps significantly reduce your energy consumption. Newly developed design of tray and demisters will increase performance with less pressure drop.

Lower operation cost Operation costs are reduced due to continuously improved designs that operate in an efficient and reliable manner, based on extensive proven experience and innovative design.

Process optimization Alstom has the process expertise to evaluate existing operations and tune the system for optimum performance.Spray headers: Improved design for uniform flue gas coverage The optimal alignment and distance between the spray headers and the nozzles enable a uniform distribution of the liquid (slurry) and the flue gas. Alstom’s design increases the gas / liquid contact and improves the SO2 removal efficiency at lower energy consumption. 

# Wet Flue Gas Desulfurisation upgrade solutions

Nozzle types: Optimal droplet diameter and dispersion Alstom increases the efficiency of the SO2 absorption with the optimum design and location on the spray bank of the spray nozzles. Our hollow cone and bi-directional nozzles are positioned with computer modeling to achieve optimised gas to liquid contact, scrubbing efficiency and reduce gas sneakage. 

## Wet FGD upgrade options:

Mist eliminators: Prevents droplets carry over at reduced pressure loss Alstom’s modeling of the mist eliminators, spacing and orientation minimises the droplet re-entrainment. Through extensive testing and experience, Alstom recommends the appropriate washing cycle that secures low pressure drop translating in energy savings and securing reliable operation. 

# For high efficiency and low maintenance costs

# Wet Flue Gas Desulfurisation upgrade solutions

A WFGD system includes many components that need to be tuned for optimum scrubber system performance Performance enhancing plates: Increased gas to liquid contact Improved gas distribution for each spray level and reduced risk for areas with high gas velocities at scrubber wall can be achieved by upgrading with enhancing plates. The improved gas distribution will increase gas to liquid contact and result in more efficient SO2
removal.

Tray upgrades: Optimal velocity with additional perforated tray Alstom’s tray design improves the optimal gas to liquid contact rate for incoming gas distribution. The tray installation has shown improved scrubbing performance and lower total operating energy consumption.

Slurry preparation equipment: Ball mill, mixers & pumps Alstom’s overall process expertise and assessment of current operation conditions will confirm any tuning needs for limestone preparation. The quality of limestone and proper grinding level in the ball mill is very important for most efficient SO2 removal. 

# For high efficiency and low maintenance costs

Make-up Water Tank 

### WET FGD

ESP or Fabric Filter

Forces Oxidation

Pulverizer

AIR Absorber Reheater (optional)

I.D Fan ME Wash

Reclaim Water Tank

Primary Dewatering

Ash Pond Secondary Dewatering Gypsum to Market Landfill Disposal Cake Wash (optional)

orPWER/BPROS/TRMWBD10/eng/THS/09.10/CH/7268 © ALSTOM 2010. All rights reserved. Information contained in this document is indicative only. No representation or warranty is given or should be relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is provided without liability and is subject to change without notice. Reproduction, use or disclosure to third parties, without express written authority, is strictly prohibited. 

## AQCS S ERVICE SOLUTIONS Air Qu a li t y Con t rol Sy ste m s



# Alstom knows how to engineer and size AQCS systems and provide performance guarantees for your upgrades

High expertise: Alstom has extensive experience on all types of Air Quality Control systems and installed the first full scale Wet Flue Gas Desulfurization system 1968. With more than 52000 MW installed Wet FGD systems on fossil fired power generation facilities, we have the knowledge to support customers for new and upgrade solutions to meet their environmental requirements. 

## High technology: Alstom has the expertise to engineer and size a complete AQCS system and will provide performance guarantees for your upgrades. We offer complete service contracts for operation and maintenance of your Wet FGD system. Forced Oxidation Air: High quality gypsum Alstom’s innovative forced oxidation system (air blown into the reaction tank combined with agitators) leads to an efficient and complete chemical reaction in the slurry tank. A stable balance results in a high quality gypsum which can be sold commercially.

R ecycle Pumps: Energy saving Alstom’s advanced design of spray headers, nozzles and other components lead to optimal liquid flow and pressure drop. The upgrade design matches for high SO2 removal and reduced power consumption from the pumps.



# “We are the ultimate leader of the installed base” T F r e s h w a t e r

F

B l o w e r H u m i d i f i e r A g i t a t o r T F r e s h w a t e r

F

B l o w e r H u m i d i f i e r A g i t a t o r

E xecution C entre Sao Paulo Alstom Brazil Av. Embaixador Macedo Soares,
10.001 05307-200 São Paulo Phone: +55 113 612 78 13

E xecution C entre Milano ALSTOM Power Italia Spa Viale Edison, 50 20099 Sesto San Giovanni MI

Phone: +39 022 434 837 31 E xecution C entre Knoxville ALSTOM Power Inc 9737 Cogdill Road, Suite 101 Knoxville, TN 37932 Phone: +1 865 966 0550
+1 866 257 8664

E xecution C entre Kolkata ALSTOM Projects India Ltd Plot No. Y-13, Block - EP, Sector V Salt Lake, Kolkata 700091 Phone: +91 334 006 01 46 

### For more information contact your Alstom Service representative:

E xecution C entre V äxjö Alstom Power Sweden AB Kvarnvägen

Box 1233 SE-351 12 Växjö Phone: +46 470 76 20 00

E xecution C entre C ologne Alstom Power Service GmbH Friedrich-Ebert-Straße 51429 Bergisch Gladbach Phone: +49 220 484 32 70



### Visit Alstom Power online: www.alstom.com/power