Novinda’s latest product, AS-Ox, offers operators of coal-fired power plants that burn PRB or bituminous coal and inject halogens (CaCl2 and/or CaBr2) to oxidize vapor-phase mercury an effective, economical and non-corrosive way to remove mercury.
Adding halides can promote mercury oxidation and removal, but it also creates its own accompanying problems:
AS-Ox, built on Novinda’s award-winning Amended Silicates™ platform, eliminates the issues associated with halide addition to the coal feed and the propensity of wet scrubbers to re-emit mercury. Injected downstream of the boiler at cooler flue gas temperatures (just 300-600 degrees F) via a typical dry sorbent injection system, AS-Ox does not contain or generate damaging halogen gases, which means:
AS-Ox matches halogen performance in mercury oxidation at a cost competitive with CaBr2 and even less than CaCl2. AS-Ox is appropriate for plants that utilize halide treatments for mercury oxidation and are equipped with SO2 scrubbers that capture oxidized mercury as a co-benefit (with or without ACI Injection). In full-scale power plant testing, AS-Ox consistently achieved mercury oxidation objectives without the mercury re-emission issues associated with some wet scrubber operations and eliminated the need for corrosive additive oxidation chemicals.