Flue-gas desulfurization (FGD) process at the Norochcholai Coal Power Plant in Sri Lanka.
Flue-gas desulfurization unit at Norochcholai Coal power plant in Sri Lanka. (Left)
FGD Chemistry: A Review
Flue-gas desulfurization (FGD) is a set of technologies used to remove sulfur dioxide (SO2) from exhaust flue gases of fossil-fuel power plants, and from the emissions of other sulfur oxide emitting processes.
Most FGD systems employ two stages: one for fly ash removal and the other for SO2 removal. Attempts have been made to remove both the fly ash and SO2 in one scrubbing vessel. However, these systems experienced severe maintenance problems and low removal efficiency. In wet scrubbing systems, the flue gas normally passes first through a fly ash removal device, either an electrostatic precipitator or a wet scrubber, and then into the SO2-absorber. However, in dry injection or spray drying operations, the SO2 is first reacted with the sorbent, and then the flue gas passes through a particulate control device.
Another important design consideration associated with wet FGD systems is that the flue gas exiting the absorber is saturated with water and still contains some SO2. These gases are highly corrosive to any downstream equipment such as fans, ducts, and stacks. Two methods that can minimize corrosion are: (1) reheating the gases to above their dew point, or (2) choosing construction materials and design conditions that allow equipment to withstand the corrosive conditions. Both alternatives are expensive, and engineers designing the system determine which method to use on a site-by-site basis.
Reference : The Coal Research Forum, UK
Flue-gas desulfurization process at the Norochcholai Coal Power Plant in
Sri Lanka.
Aeration of sea water to remove Sulfur during the Flue gas desulfurization FGD) process at the Norochcholai Coal Power Plant in Sri Lanka
Flue-gas desulfurization
Areation of sea water to remove Sulpher
Flue-gas desulfurization (FGD) unit at the Norochcholai Coal Power Plant in Sri Lanka.
Special Thank to Eng. K. A. Nishantha Perera, Operation Engineer, Norochcholai Coal Power Plant,
Sri Lanka.
Reference : FGD Chemistry: A Review by Dr. Chris Satterley, E.ON New Build & Technology Ltd., UK.
Flue gas is the gas exiting to the atmosphere via a flue, which is a pipe or channel for conveying exhaust gases from a fireplace, oven, furnace, boiler or steam generator. Quite often, the flue gas refers to the combustion exhaust gas produced at power plants. Its composition depends on what is being burned, but it will usually consist of mostly nitrogen (typically more than two-thirds) derived from the combustion air, carbon dioxide (CO2), and water vapor as well as excess oxygen (also derived from the combustion air). It further contains a small percentage of a number of pollutants, such as particulate matter (like soot), carbon monoxide, nitrogen oxides, and sulfur oxides.
Flue
A flue is a duct, pipe, or opening in a chimney for conveying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors. Historically the term flue meant the chimney itself.
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