Control of mercury and other elemental metal emissions from combustion devices by oxidation
AssigneeBreen Energy Solutions
InventorsBernard P. Breen, James E. Gabrielson
Life of this patent
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Abstract
In a method of removing metals such as mercury from flue gas produced by combustion devices, ammonia and optionally carbon monoxide are injected into the flue gas in a manner so that there are sufficient amounts of these materials in the flue gas when the flue gas is at a temperature of from 900° F. to 1350° F. to oxidize the metals within the flue gas. The oxidized metals are then attracted to particulates present in the flue gas. These particulates bound with oxidized metals are removed from the flue gas by a particulate removal device such as an electrostatic precipitator or baghouse.
Claims15
A method of removing mercury from flue gas produced by combustion devices burning mercury containing fuel, the flue gas containing particles and passing from a combustion zone in which the temperature exceeds 2600° F., through a first temperature zone in which the temperatures range from 1750° F. to 2100° F., through a second temperature zone in which the temperatures range from 900° F. to 1350° F. and through a particle removal device, the method comprising introducing ammonia into the flue gas when the flue gas passes through the second temperature zone, the ammonia being introduced in sufficient amounts to oxidize mercury within the flue gas.
A method of removing metals from flue gas produced by combustion devices burning fuel containing those metals, the flue gas containing particles and passing from a combustion zone in which the temperature exceeds 2600° F., through a first temperature zone in which the temperatures range from 1750° F. to 2100° F., through a second temperature zone in which the temperatures range from 900° F. to 1350° F. and through a particle removal device, the method comprising introducing a material into the flue gas that controls free radical C1 when the flue gas passes through the second temperature zone in sufficient amounts to oxidize the metals within the flue gas.
The method of claim 12 wherein the material is a material selected from the group consisting of ammonia, urea, hydrochloric acid and carbon monoxide.
A method of removing metals from flue gas produced by combustion devices burning fuel containing metals, the flue gas containing particles and passing from a combustion zone in which the temperature exceeds 2600° F., through a first temperature zone in which the temperature ranges from 1750° F. to 2100° F., through a second temperature zone in which the temperatures range from 900° F. to 1350° F. and through a particle removal device, the method comprising introducing a material into the flue gas that affects the flue gas in a manner to optimize C1 oxidation of elemental metals in the second temperature zone.
Dependencies are inferred from the claim text.