Process for low mercury coal
First Claim
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1. A process for producing low mercury coal comprising:
- drying raw coal with heated gas, wherein said gas is selected from the group consisting of combustion gas, recycled fines-free dryer exit gas, carbon dioxide, pyrolysis gas, steam, and combinations thereof, and wherein said coal temperature is maintained below about 300°
F.;
vaporizing mercury from said dried coal with a purge gas substantially inert to mercury, wherein said purge gas is selected from the group consisting of sulfur-free combustion gas, recycled fines-free dryer exit gas, carbon dioxide, pyrolysis gas, natural gas, air, steam, and combinations thereof, and wherein said coal temperature traverses a range of about 300°
to 550°
F.;
removing mercury from said purge gas wherein such removal is selected from the group comprising activated carbon adsorption, mercury reacting liquid absorption, condensation, and combinations thereof; and
recovering said low mercury coal.
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Abstract
A process for producing low mercury coal during precombustion procedures by releasing mercury through discriminating mild heating that minimizes other burdensome constituents. Said mercury is recovered from the overhead gases by selective removal.
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Citations
6 Claims
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1. A process for producing low mercury coal comprising:
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drying raw coal with heated gas, wherein said gas is selected from the group consisting of combustion gas, recycled fines-free dryer exit gas, carbon dioxide, pyrolysis gas, steam, and combinations thereof, and wherein said coal temperature is maintained below about 300°
F.;vaporizing mercury from said dried coal with a purge gas substantially inert to mercury, wherein said purge gas is selected from the group consisting of sulfur-free combustion gas, recycled fines-free dryer exit gas, carbon dioxide, pyrolysis gas, natural gas, air, steam, and combinations thereof, and wherein said coal temperature traverses a range of about 300°
to 550°
F.;removing mercury from said purge gas wherein such removal is selected from the group comprising activated carbon adsorption, mercury reacting liquid absorption, condensation, and combinations thereof; and recovering said low mercury coal. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification
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Current AssigneeWestern Research Institute
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Original AssigneeWestern Research Institute
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InventorsMerriam, Norman W., Grimes, R. William, Tweed, Robert E.
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Primary Examiner(s)Niebling, John
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Assistant Examiner(s)Wong, Edna
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Application NumberUS08/054,922Time in Patent Office704 DaysField of Search44/621, 44/622, 44/626, 423/107, 423/210, 423/461, 55/72, 55/74, 201/17, 201/41US Class Current44/621CPC Class CodesC10L 9/08 by heat treatments, e.g. ca...
