The Greenidge Multi-Pollutant Control Project: Key Technical and Economic Features of a New Approach for Reducing Emissions from Smaller Coal-Fired Units

摘要

A new approach to multi-pollutant control is being demonstrated at the coal-fired, 107 MW_e AES Greenidge Unit 4 (Boiler 6) in Dresden, NY, as part of the Greenidge Multi-Pollutant Control (MPC) Project. The project, which is part of the U.S. Department of Energy’s (DOE) Power Plant Improvement Initiative, is being conducted by a team including CONSOL Energy Inc. as prime contractor, AES Greenidge LLC as host site, and Babcock Power Environmental Inc. as engineering, procurement, and construction (EPC) contractor. All funding for the project is being provided by the U.S. DOE, through its National Energy Technology Laboratory, and by AES Greenidge. The MPC system, which was installed in 2006 and is being tested while the unit fires 2-4% sulfur eastern U.S. bituminous coal and co-fires up to 10% biomass, includes a hybrid selective non-catalytic reduction (SNCR) / in-duct selective catalytic reduction (SCR) system to reduce NO_x emissions by ≥60%, followed by a Turbosorp~R circulating fluidized bed dry scrubber system to reduce emissions of SO2, SO3, HCl, and HF by ≥95%. Mercury removal of ≥90% is also targeted via the co-benefits afforded by the in-duct SCR, dry scrubber, and baghouse and by injection of activated carbon upstream of the scrubber, as required. The objective of the project is to substantiate that this combination of technologies can cost-effectively provide deep emissions reductions when retrofitted on existing coal-fired electrical generating units (EGUs) with capacities less than 300 MW_e.