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The authors have successfully developed novel efficient and costeffective sorbents for mercury removal from coal combustion flue gases. These sorbents were evaluated in a fixedbed system with a typical PRB subbituminous/lignite simulated flue gas, and in an entrainedflow system with air simulating inflight mercury capture by sorbent injection in the ductwork of coalfired utility plants.
A laboratoryscale packedbed reactor system is used to screen sorbents for their capability to remove elemental mercury from various carrier gases. When the carrier gas is argon, an online atomic fluorescence spectrophotometer (AFS), used in a continuous mode, monitors the elemental mercury concentration in the inlet and outlet streams of the packedbed reactor.
Mercury emissions from coalfired power plant flue gas (CFFG 1) threaten the natural environment and human health, and this has attracted the attention of environmental protection departments and scientific researchers in recent adsorbents perform well at mercury removal and extensive studies on them have been conducted.
The use of dual beds, (, two beds in series) should be capable of achieving carbon removal levels of greater than 99%. Sorbents for Mercury Capture A number of companies produce activated carbons that have been used commercially for mercury removal from combustion flue gas, with most of the applications being for incinerator stack gas.
The power generation market for mercury control sorbents is estimated by EPA to be in the billions of dollars. Other potential applications include combustion sources in Europe, where mercury regulation is more stringent, and the municipal and sludge incineration markets, where mercury controls already are in .
CONTROL OF MERCURY EMISSIONS FROM COALFIRED ELECTRIC UTILITY BOILERS Air Pollution Prevention and Control Division National Risk Management Research Laboratory Office of Research and Development Environmental Protection Agency Research Triangle Park, NC Introduction During combustion, the mercury (Hg) in coal is volatilized and converted ...
The proposed program addresses the removal of elemental mercury and sulfur oxides from coalfired utility boiler flue gas by catalytic oxidative adsorption on a regenerable substrate. This proposal concentrates on the preparation, characterization, and testing of metal oxide and metal oxysulfide sorbents.
In December 2000, EPA announced its intent to regulate the emission of mercury from coalfired power plants. ADA Technologies, Inc., is developing a family of new disposable sorbents for this application. The sorbents consist of a natural silicate doped with chemicals to capture and immobilize vaporphase mercury and mercury compounds.
This study evaluated the suitability of the magnetic composites as sorbents for the removal of elemental mercury vapor from flue gases of coalfired power plants. The sorbents were found to completely capture mercury at temperatures up to 200{sup o}C, and the mercury capacity of the sorbents was found to be affected by the state, content, and ...
generating power. WGCU includes the removal of mercury (Hg), present in coal, from the syngas. Carbonbased sorbents used for Hg removal are not suitable for hightemperature Hg removal in conjunction with the WGCU. The U Department of Energy''s National Energy Technology LaboraS
The authors have successfully developed novel efficient and costeffective sorbents for mercury removal from coal combustion flue gases. These sorbents were evaluated in .
Magnetic zeolite composites with supported silver nanoparticles are a new class of multifunctional materials with potential applications as recyclable catalysts, disinfectants, and sorbents. This study evaluated the suitability of the magnetic composites as sorbents for the removal of elemental mercury vapor from flue gases of coalfired power plants.
A review of the various promoters and sorbents examined for the removal of mercury from flue gas is presented. Commercial sorbent processes are described along with the chemistry of the various sorbentmercury interactions. Novel sorbents for removing mercury from flue gas are suggested. Since activated carbons are expensive, alternate sorbents and/or improved activated carbons are needed.
article{osti_924869, title = {The ADESORB Process for Economical Production of Sorbents for Mercury Removal from Coal Fired Power Plants}, author = {Robin Stewart}, abstractNote = {The DOE''s National Energy Technology Laboratory (NETL) currently manages the largest research program in the country for controlling coalbased mercury emissions.
A review of the various promoters and sorbents examined for the removal of mercury from flue gas is presented. Commercial sorbent processes are described along with the chemistry of the various sorbentmercury interactions. Novel sorbents for removing mercury from flue gas are suggested. Since ...
For the past 3 years, ADA Technologies, Inc. (ADA), has been developing and testing a new class of mercury control sorbents called Amended Silicates™, with the overall goal of commercializing these sorbent materials for removal of vaporphase mercury from coalfired flue gas streams.
article{osti_, title = {Effects of HCl and SO{sub 2} concentration on mercury removal by activated carbon sorbents in coalderived flue gas}, author = {Ryota Ochiai and M. Azhar Uddin and Eiji Sasaoka and Shengji Wu}, abstractNote = {The effect of the presence of HCl and SO{sub 2} in the simulated coal combustion flue gas on the Hg{sup 0} removal by a commercial activated carbon ...
Development of an elemental mercury (Hg 0) removal process for coal derived fuel gas is an important issue in the development of a clean and highly efficient coal power generation, ironbased sorbents such as iron oxide (Fe 2 O 3), supported iron oxide on TiO 2, and iron disulfide have been proposed as active mercury was supposed that Hg 0 reacted with H 2 S on the ...
Operators of coal fired power plants have a lot to worry about today: The price of coal relative to natural gas, stack emissions, EPA regulations and the unpredictable nature of future potential ...
The removal efficiency (η) of Hg 0 was used to evaluate the performance of the sorbents for the capture of Hg 0 from coal derived fuel gas. η is calculated by the following formula:
per pound of mercury removed) for an activated carbon process for the removal of mercury from a more dilute stream (1 ppb Hg flue gas from a utility) will be even worse. Many sorbents can remove mercury from flue gas. A sorbent can capture mercury from flue gas via amalgamation (alloying),
For coalfired power plants without WFGD systems, alternate efficient methods and low cost mercury sorbents are essential for mercury removal. To reduce the costs of mercury removal, the mercury oxidation and adsorption rates of mixed sorbents were measured under the complete flue gas atmosphere with the HCl concentration of 50 ppm.
Evaluation of Nanocrystalline Sorbents for Mercury Removal from Coal Gasifier Fuel Gas Raja A. Jadhav* 1, Howard S. Meyer 1, Slawomir Winecki 2, and Ronald W. Breault 3
Over the past few years, laboratory and pilotscale studies have been conducted to investigate the use of solid sorbents for the removal of mercury from coalfired, utility flue gas streams. Many factors affect the performance of these sorbents including flue gas conditions, mercury type, and utility operating conditions and configuration.
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