Flue gas mercury control
OwnerSrivats Srinivasacharinventor
Life of this patent
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Abstract
An adsorbent composition for removing mercury from a flue gas stream, and a method of its use. The composition is a powdered activated carbon having at least one of a halogen-containing component and an alkaline component dispersed thereon. A flow agent can be composited with the material to maintain flowability in situ.
Claims33
An adsorbent composition for removing mercury from a flue gas stream, comprising:
- powdered activated carbon having a mean particle size (d50) of 20-25 microns or less, and comprising at least one separate alkaline component selected from the group of alkaline components consisting of sodium bicarbonate, sodium carbonate, ammonium carbonate, ammonium bicarbonate, potassium carbonate, potassium bicarbonate, trona, magnesium oxide, magnesium hydroxide, calcium oxide, calcium hydroxide, calcium bicarbonate and calcium carbonate dispersed thereon.
An adsorbent composition for removing mercury from a flue gas stream, comprising:
- powdered activated carbon having a mean particle size (d50) of 20-25 microns or less, and comprising a separate flow agent dispersed thereon.
An adsorbent composition for removing mercury from a flue gas stream, comprising:
- powdered activated carbon comprising a separate chemical component dispersed thereon that undergoes an endothermic decomposition at flue gas temperatures below about 1100° F.
An adsorbent composition for removing mercury from a flue gas stream, comprising:
- dry powdered activated carbon having a mean particle size (d50) of 20-25 microns or less, and comprising a separate chemical component dispersed thereon comprising a hydrophobic portion that is coupled to the activated carbon and a hydrophilic portion that increases stability in a water-based medium.
A method of removing mercury from flue gas resulting from combustion, in which the flue gas is passed through a particle separator, comprising:
- injecting powdered activated carbon into the flue gas at one or more locations before the flue gas reaches the particle separator;
- and
- injecting a sacrificial agent into the flue gas at one or more locations before the flue gas reaches the particle separator, wherein the sacrificial agent is selected from the group of agents consisting of:
- organic compounds having sulfonate, carboxylate or amino functional groups;
- sodium methyl naphthalene sulfonate;
- phenyl glycol ethers;
- poly-napthalene sulfonate;
- sodium/calcium lignosulfonate;
- Aerosol-OS;
- salts of alkyl naphthalene sulfonates;
- and ethylene glycol phenyl ether.
Dependencies are inferred from the claim text.