Systems and methods for optimizing a pac ratio
AssigneeThe Southern Company
InventorsDAMON WOODSON, Brandon Looney
Life of this patent
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Abstract
An exemplary embodiment of the present invention provides a method of controlling a PAC-to-particulate ratio in a potion of an exhaust system from a furnace. The method comprises measuring a second amount of particulate exiting a particulate removal system, and controlling a first amount of particulate removed by the particulate removal system based in part on the measured second amount of particulate, such that a desired ratio of PAC-to-particulate is obtained in the portion of the exhaust system.
Claims16
In an furnace exhaust system for removing an exhaust from a furnace, the exhaust comprising particulate, the furnace exhaust system comprising a particulate removal system for removing a first amount of the particulate from the exhaust, such that a second amount of the particulate exits the particulate removal system through a duct, the exhaust system further comprising a PAC injection system for injecting PAC into the exhaust downstream of the particulate removal system, a method of controlling a PAC-to-particulate ratio in a portion of the exhaust system downstream of the particulate removal system comprising:
- measuring the second amount of the particulate remaining in the exhaust;
- and
- controlling the first amount of the particulate removed by the particulate removal system based in part on the measured second amount of particulate.
In a coal-fired power generation plant comprising a furnace, an electrostatic precipitator, a PAC injection system, and a PAC filtration system, wherein an exhaust comprising particulate exits the furnace and enters the electrostatic precipitator wherein a first amount of the particulate is removed from the exhaust before the remaining exhaust comprising a second amount of the particulate exits the electrostatic precipitator via a duct, wherein the PAC injection system injects PAC into the duct, such that at least a portion of the PAC comes into contact with at least a portion of the second amount of the particulate, wherein the exhaust comprising the second amount of particulate and the PAC enter the PAC filtration system, a method of controlling the ratio of PAC-to-particulate in a portion of the plant downstream of the electrostatic precipitator to optimize mercury removal comprising:
- based in part on the second amount of the particulate exiting the electrostatic precipitator, varying the magnitude of an electric field applied to components of the electrostatic precipitator.
In a system for removing a first amount of mercury from an exhaust of a coal-fired furnace, wherein the exhaust comprises a second amount of mercury and particulate, wherein the system is configured to remove a first amount of the particulate from the exhaust, inject an amount of PAC into the exhaust having a remaining second amount of the particulate, such that the first amount of mercury is adsorbed or absorbed by the PAC, and filter the PAC from the exhaust, a method of reducing the amount of PAC used to remove the first amount of mercury comprising:
- measuring the second amount of the particulate;
- varying the first amount of the particulate removed from the exhaust based on the measured second amount of the particulate.
Dependencies are inferred from the claim text.