Paris, January 7, 2011 — Alstom won a contract via its joint venture company NASL worth about $26 million from the National Aluminium Co. (Nalco) to retrofit the electrostatic precipitators (ESPs) at five units of its captive power plant in Angul Orissa.
The ESPs at Angul were originally supplied by BHEL and the units were commissioned between 1985 and 1989. The upgrade will reduce particulate emissions from the plant to well below the 150 mg/Nm3 requested by the Environment Pollution Control Board, thus allowing Nalco to conform to India’s environmental requirements.
The contract scope includes the design, engineering, supply, erection and commissioning of the mechanical and electrical components of the ESPs, including the control system and the ash handling system.
The contract will be executed through Nalco’s local services partner, NASL, a joint venture company of Alstom and National Thermal Power Corp. (NTPC). The first unit is expected to be commissioned in 2012, with the fifth one being completed in 2014.
Alstom has been associated with Nalco for almost three decades. Alstom executed its first project with Nalco in 1982 with the supply of a fume treatment plant for Nalco's aluminium smelter. Since then, Alstom has supplied fume treatment plants for all potline expansions at the Angul plant.
ESPs have been used widely to control particulate emissions. ESPs are often the most cost-effective solution due to high removal efficiencies in combination with robustness and low maintenance costs.
A large majority of industrial and thermal power units in India are equipped with ESPs. More stringent emission requirements and more challenging conditions due to fuel switching and other process changes result in a need for improved collection efficiency and ESP retrofit.