St. Louis, March 2, 2010 – Alberici Constructors completed a $230 million project to reduce emissions from the coal-fired power plant in Coffeen, Ill., owned by Ameren Energy Resources Co.
Ameren Energy Resources Co. is the holding company for merchant generation and energy marketing services for Ameren Corp.
The final phase of the project was completed Thursday, Feb. 25, when Unit #2 of the plant resumed operations.
The project at Coffeen Station, about 70 miles northeast of St. Louis, is part of a $1 billion environmental improvement program conducted at Ameren’s coal-fired power plants in Illinois as part of AER’s commitment to provide cleaner energy and comply with environmental laws.
The Coffeen project called for Alberici to construct a new scrubber facility to remove sulfur dioxide from combustion gases coming from the plant’s two coal-fired boilers.
To construct the facility, Alberici installed two large absorber vessels and related equipment manufactured by Hitachi Power Systems America, Ltd. The facility grinds limestone, adding it to water to create a slurry that is then sprayed over the combustion gases in a large absorber vessel. This chemical reaction extracts sulfur from the gases and converts the limestone slurry to gypsum – a potentially useful by-product.
Alberici worked with Ameren’s engineering firm, Sargent & Lundy, to perform the design-build project on a tight schedule.
In addition to the sulfur dioxide scrubber system, the project called for Alberici to construct a new electrostatic precipitator system, which uses electric charges to remove particulate matter from the plant’s combustion gases.