High performance mercury capture
a mercury capture and high-performance technology, applied in the direction of emission prevention, separation processes, lighting and heating apparatus, etc., can solve the problems of more difficult to remove mercury from flue gas produced by coal-fired power plants, and the requirement of increasing carbon injection rates to meet more stringent emission regulations. , to achieve the effect of high-performance mercury captur
Active Publication Date: 2014-02-13
ANDRITZ AB
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Benefits of technology
The patent describes a system and method for removing mercury from the flue gas of coal-fired power plants. The system has a high mercury capture rate of 99.9% or more, meaning that most of the mercury is removed from the flue gas in the first fabric filter and the remaining mercury is captured in the second or last fabric filter. The amount of mercury remaining after the first filter is very low, so the second filter has a low level of mercury absorbed on the activated carbon and is able to capture additional mercury. This still active carbon is then re-used in the first filter. Overall, the system has a high mercury capture rate and is efficient in removing mercury from flue gas.
Problems solved by technology
Both of these differences make it more difficult to remove mercury from flue gas produced by a coal-fired power plant.
The utilization factor for activated carbon is important as it is costly.
However, even with these industry efforts, compliance with more stringent emission regulations requires increased carbon injection rates.
Method used
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[0013]The present invention relates to a system and a method for removing elemental mercury and / or mercury compounds from the products of solid fuel combustion including flue gas, and more particularly, to a system and a method for removing elemental mercury and / or mercury compounds from flue or process gas produced by coal combustion, such as from a coal-fired power plant.
[0014]One common coal in the United States is subbituminous coal, typically from the Powder River Basin, commonly referred to as PRB coal. PRB coal can have mercury contents of about 10 pounds per trillion British thermal units (lb / TBtu). To meet the United States Environmental Protection Agency (U.S. EPA) regulations for new power plants, the mercury capture equipment or system needs to capture or remove over 99.8 percent of the mercury present in the flue gas. Current mercury emission regulations are less stringent requiring about 1.2 lb / TBtu, or a little less than 90 percent removal of the mercury present in th...
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Abstract
A method and system for high performance mercury capture from solid fuel combustion flue gas is provided. The method includes injecting pulverized activated carbon into a mercury capture system with at least a first and a second fabric filter, collecting the pulverized activated carbon captured in the second fabric filter, and injecting the collected pulverized activated carbon from the second fabric filter upstream of the first fabric filter for reuse to capture mercury from the process gas.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61 / 680,490; filed on Aug. 7, 2012, entitled “HIGH PERFORMANCE MERCURY CAPTURE” which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a system and a method for removing mercury from the products of solid fuel combustion including flue gases, and more particularly, to a system and a method for removing elemental mercury or mercury compounds from flue gases produced by coal combustion.BACKGROUND OF THE INVENTION[0003]The use of activated carbon for the adsorption of mercury vapor has been successfully demonstrated in various applications such as municipal waste incineration. However, there are significant differences in the concentration of mercury from waste incinerator flue gas as compared to coal-fired power plant flue gas, with the concentration of mercury from the coal-fired power plants bei...
Claims
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IPC IPC(8): B01D53/64
CPCB01D53/64B01D53/10B01D2253/102B01D2257/602B01D2258/0283B01D53/505F23J15/02F23J2215/20F23J2215/60F23J2217/101F23J2219/30
Inventor LASLO, DENNIS JAMES
Owner ANDRITZ AB