TPW/BPROS/ESPBRC12/eng/ECS/06.12/CH/7709 © ALSTOM 2012. 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. Alstom contributes to the protection of the environment. This leaflet is printed on environmentally-friendly paper.

AIR QUALITY CONTROL SYSTEMS

Electrostatic Precipitators Effectively improving the environment

Alstom’s wide range of Electrostatic Precipitators (ESP) designs offer the best fit for all applications, optimising emission compliance and saving power.

Meeting the most stringent regulation with the lowest cost Electrostatic Precipitators (ESP) are widely accepted across the world as an effective system for particulate emissions control. Alstom Electrostatic Precipitators, offer a reliable solution to the demands of increasingly strict regulations for particulate matter emissions worldwide, at the lowest lifecycle cost.

ESPs work by creating a high voltage electrical field (corona) around the discharge electrodes, which causes the gases and the dust particles being carried by the gases, to get ionised. The dust particles, once charged, migrate to and deposit themselves on the neutral collecting plates, from which they are dislodged by periodic rapping and guided to dust hoppers for removal.

Alstom offers a wide range of ESP designs, with a choice of discharge electrodes and rapping systems, to provide the most cost effective, technically reliable solution for every application.

Applications

Power and Industrial Boilers firing Coal, Lignite, Oil, Orimulsion, Biomass and other fuelsVarious processes in Iron & Steel and non-ferrous Metallurgical industries, Cement industry, Incineration plants, Glass smelting and Pulp & Paper plants, etc.

Customer Benefits HIGH PARTICULATE REMOVAL EFFICIENCYEmission levels less than 10 mg/Nm³

CUSTOMISATION Choice of discharge electrodes customised to specific demands of various applications

INCREASED AVAILABILITY Robust design and construction ensures reliability

REDUCED COMPLIANCE COSTS Integrated control system optimises power savings while maximising performance

LOWER INVESTMENT Easy to install due to flexible layout and modular design

PROVEN DESIGN Proven technology fine tuned with global experience and a large installed base

TPW/BPROS/ESPBRC12/eng/ECS/06.12/CH/7709 © ALSTOM 2012. 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. Alstom contributes to the protection of the environment. This leaflet is printed on environmentally-friendly paper.

To find out more about Alstom’s ESP technology and applications, please contact your local Alstom

representative:

Alstom PowerBrown Boveri Strasse 7

5401 BadenSwitzerland

������������������Visit �� online: ������������www.alstom.com

AIR QUALITY CONTROL SYSTEMSELECTROSTATIC PRECIPITATORS

STATE-OF-THE-ART LABORATORY AND TESTING FACILITIES Highly-skilled engineers and technicians from Alstom’s R&D Execution Centre in Växjö, Sweden support our customers and the further development of our ESP technology solutions.

ALSTOM ESP EXPERIENCEAlstom’s ESP technology and know-how have been established for over 60 years, with more than 4,500 ESP Installations around the world across all applications. In Power generation alone, Alstom has an installed base of 197 GW globally.

SCOPE OPTIONS

EPC OPTION

Design, Engineering, Supply, Erection & Com-missioning with or without Civil Works

EP OPTION

Design, Engineering & Supply with Advisory Service during Erection & Comminssioning

SERVICES ONLY

Operation & Maintenance Services

SPECIFICATIONS

PM Removal Efficiency Approx. 99.95%

Emission Level < 10 mg/Nm3

Corona Power Consumption 1-10 Watts/m2

3 STEPS TO MAXIMISE PERFORMANCE1 Optimum charging of the dust is fundamental to effective ESP performance and

this is achieved by perfectly matching the choice of the discharge electrode design to the demands of the application.

The Alstom spiral discharge electrodes ensure uniform corona current distribution and is universally recognized as the most effective solution for medium and high resistivity dustThe Alstom multi-peak discharge electrodes are best suited for applications involving low resistivity dusts or dusts having large amounts of fine particles.

2 Effective Cleaning System design helps prevent dust building up on the collecting plates, minimizing the “back corona” effect, which otherwise diminishes the efficiency of the ESP, especially if the dust resistivity is high.

Alstom uses a robust Tumbling Hammer design which is most effective in dislodging even the most resistant dust from the electrodes, to ensure consistently high efficiency of the ESPAlstom also offers, Electric Impact Rapping (EIR) for applications involving low resistivity dust, where relatively mild rapping is sufficient. The design of the EIR is simple and easy to maintain as all the moving parts are accessible from outside the flue gas path.

3 High quality Integrated ESP Control systems ensure optimized performance of the ESP

Alstom’s Electrostatic Precipitator Intelligent Controller (EPIC III) is a 3rd generation state-of-the-art ESP control system that delivers

–optimum performance and power savings thanks to a range of operating modes –rapping sequence optimization and power controlled rapping as well as self-optimization algorithms (EPOQ)

Alstom also offers the Switch Integrated Rectifier (SIR) high frequency output power supplies, which ensures maximum power injection without sparking and is highly effective for low and medium resistivity dusts.

TYPICAL ESP LAYOUT & KEY COMPONENTS

Gas distribution screens

Power supply

Casing

Collecting electrodes

Discharge electrode system

Bottom arrangement (pyramid hoppers, trough hoppersor scrapers, baffles)

Rapping mechanism for discharge and collecting electrodes