Reducing Operating Costs and Risks of Hg Control with Fuel Additives

摘要

Under the MATS rule, coal-fired boilers have many options for mercury control. Once in compliance, plants will need to keep the operating costs of mercury control systems in check. Coal additives are used to increase the oxidation of mercury in the flue gas and improve the effectiveness of activated carbon. Bromine is currently the most commonly used coal additive. While effective, bromine addition has been associated with balance-of-plant problems. ADA's M-Prove™ coal additive has been used successfully on PRB- and lignite-fired boilers to increase mercury oxidation and reduce PAC consumption for mercury control. The paper presents a case study on the successful demonstration of M-Prove combined with powdered activated carbon at a subbituminous-fired boiler with a cold-side ESP to achieve mercury emissions below the MATS limit in order to reduce carbon consumption and minimize balance-of-plant impacts.