Available Technology

Mercury Sorbent Delivery System for Flue Gas

The Department of Energy’s National Energy Technology Laboratory (NETL) is seeking licensing partners interested in implementing United States Patent Number 7,494,632 titled "Mercury Sorbent Delivery System for Flue Gas."
Mercury is a natural contaminant in fossil fuels. In high temperature gas streams in power plants, nearly all of the mercury in coal ends up in the flue gases (about 1 part per billion (ppb) concentration) after combustion. These flue gases may contain mercury in elemental, oxidized, and particulate forms. Elemental mercury in exhaust gases does not adhere to soot and other particles entrained with the gases, but instead tends to remain in the vapor phase, making it the hardest form of mercury to remove. One typical adsorbent for use with this invention is an activated carbon particle having a particle size of 2 microns to about 30 microns. This small size effectively reduces mass transfer resistance by decreasing the capture distance. Further, the low consumption rate compared to duct injection makes employment of promoted carbons as well as other high capacity sorbents economically feasible. As the mercury-containing flue gas passes through the filter bag layers, the first layer removes particulates in a separate stream. The reduced-particle flue gas then enters the mercury adsorbent media, where the adsorbent removes elemental mercury vapor from the dust-free flue gas.
A method of removing elemental mercury from high temperature flue gas streams and contaminated aqueous streams -A way of reducing the amount of toxic mercury that enters the environment -An inexpensive method of flue gas clean-up based on reduced consumption of sorbents
Edgar Klunder
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