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CONTROL OF MERCURY EMISSIONS FROM COAL-FIRED ELECTRIC UTILITY BOILERS Air Pollution Prevention and Control Division National Risk Management Research Laboratory Office of Research and Development U.S. Environmental Protection Agency Research Triangle Park, NC Introduction During combustion, the mercury (Hg) in coal is volatilized and converted ...
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
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 sorbent-mercury interactions. Novel sorbents for removing mercury from flue gas are suggested. Since ...
Development of Nano-Sulfide Sorbent for Efficient Removal of Elemental Mercury from Coal Combustion Fuel Gas Hailong Li,†,§ Lei Zhu,† Jun Wang,‡ Liqing Li,† and Kaimin Shih*,§ †School of Energy Science and Engineering, Central South University, Changsha, China 410083 ‡Department of Occupational and Environmental Health, College of Public Health, University of Oklahoma Health ...
Over the past few years, laboratory and pilot-scale studies have been conducted to investigate the use of solid sorbents for the removal of mercury from coal-fired, utility flue gas streams. Many factors affect the performance of these sorbents including flue gas conditions, mercury type, and utility operating conditions and configuration.
The U.S. 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 .
Mercury emissions from coal-fired 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 years.Mineral adsorbents perform well at mercury removal and extensive studies on them have been conducted.
A natural chabazite-based silver nanocomposite (AgMC) was synthesized to capture mercury from flue gases of coal-fired power plants. Silver nanoparticles were engineered on zeolite through ion-exchange of sodium ions with silver ions, followed by thermal annealing. Mercury sorption test using AgMC was performed at various temperatures by exposing it to either pulse injection of mercury or ...
The authors have successfully developed novel efficient and cost-effective sorbents for mercury removal from coal combustion flue gases. These sorbents were evaluated in .
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 sorbent-mercury 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.
A laboratory-scale packed-bed 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 on-line atomic fluorescence spectrophotometer (AFS), used in a continuous mode, monitors the elemental mercury concentration in the inlet and outlet streams of the packed-bed reactor.
A laboratory-scale packed-bed reactor system is used to screen sorbents for their capability to remove elemental mercury from various carrier gases. When the carrier gas is argon,
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),
The use of dual beds, (i.e., 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.
issue related to mercury emissions control from coal-fired power plants is the transformation of absorbed ionic mercury to insoluble elemental mercury in wet FGD scrubbers, leading to elemental mercury re-emission. Wet scrubbers are known to provide the co-benefit of mercury removal, when mercury is found in the flue gas in oxidized form.
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 coal-fired power plants.
@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 coal-based mercury emissions.
For coal-fired 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.
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 vapor-phase mercury from coal-fired flue gas streams.
The authors have successfully developed novel efficient and cost-effective sorbents for mercury removal from coal combustion flue gases. These sorbents were evaluated in .
The authors have successfully developed novel efficient and cost-effective sorbents for mercury removal from coal combustion flue gases. These sorbents were evaluated in a fixed-bed system with a typical PRB subbituminous/lignite simulated flue gas, and in an entrained-flow system with air simulating in-flight mercury capture by sorbent injection in the ductwork of coal-fired utility plants.
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 system.Recently, iron-based sorbents such as iron oxide (Fe 2 O 3), supported iron oxide on TiO 2, and iron disulfide have been proposed as active mercury sorbents.It was supposed that Hg 0 reacted with H 2 S on the ...
In December 2000, EPA announced its intent to regulate the emission of mercury from coal-fired 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 vapor-phase mercury and mercury compounds.
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