PSNH Flue Gas Desulfurization
Public Service Company of New Hampshire (PSNH) required services to complete engineering, design, procurement, construction and commissioning of a Flue Gas Desulfurization system (FGD) to reduce mercury and sulfur emissions from two Babcock and Wilcox pressurized cyclone fired units at the Generating Station. The Generating Station’s Unit 1 (MK1) was installed in 1960 and had a gross generation of 122 MW. Unit 2 (MK2) was installed in 1968 and had a gross generation of 336MW. These units were designed to burn 3% sulfur coals and had decreased over time to burn at 1%. The units had been retrofitted with Selective Catalytic Reduction Systems and also required the installation of FGD to meet the requirements of New Hampshire Law. Daniel O’Connell’s Sons managed and self-performed major components of the utility and underground construction of this project which included over 10,000 LF or steel welded piping ranging in size from 4 to 16 inches. Other aspects of included in the scope of work was the construction and installation of a concrete bridge, drainage system for entire site, pump and force main and the preparation work of a 115KV substation for future activity. This work had to be performed while the plant was fully operational without and shutdowns or interruption in service, which DOC managed and delivered in five months.
