Control of mercury and other elemental metal emissions from combustion devices by oxidation
First Claim
1. A method of removing mercury from flue gas produced by combustion devices burning mercury and chlorine 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 increase concentration of atomic chlorine in the second zone such that the chlorine will bond with mercury within the flue gas in the second temperature zone.
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Accused Products
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.
109 Citations
16 Claims
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1. A method of removing mercury from flue gas produced by combustion devices burning mercury and chlorine 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 increase concentration of atomic chlorine in the second zone such that the chlorine will bond with mercury within the flue gas in the second temperature zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- F., through a first temperature zone in which the temperatures range from 1750°
-
11. A method of removing metals from flue gas produced by combustion devices burning fuel containing those metals and chlorine 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 Cl when the flue gas passes through the second temperature zone in sufficient amounts to increase concentration of atomic chlorine in the second temperature zone such that the chlorine will bond with the metals within the flue gas in the second temperature zone. - View Dependent Claims (12, 13)
- F., through a first temperature zone in which the temperatures range from 1750°
-
14. A method of removing metals from flue gas produced by combustion devices burning fuel containing metals and chlorine, 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 Cl oxidation of elemental metals in the second temperature zone. - View Dependent Claims (15, 16)
- F., through a first temperature zone in which the temperature ranges from 1750°
Specification