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Airborne Flue Gas Facility

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Coal is burned to make steam, which drives the turbines to generate electricity. During the combustion process, SOx and NOx are formed. Some heavy metals are vaporized. The Airborne process removes these contaminants from the flue gas prior to its release into the atmosphere. Sodium bicarbonate reacts with the SOx and NOx in the flue gas to produce sodium sulfate and sodium nitrate. The sodium sulphate and nitrate are absorbed into a solution in the wet scrubber. Un-reacted SOx and NOx are also absorbed into the solution as sodium sulfate and sodium nitrate. The solution is passed through a filter to remove heavy metals and particulate matter. The purified sodium sulfate/nitrate solution is evaporated to the desired concentration. Ammonia supplied from commercial sources and carbon dioxide supplied from the power plant or commercial sources is introduced into the process. Ammonia, carbon dioxide and water are combined to make ammonium bicarbonate. Purified sodium sulfate and ammonium bicarbonate are combined to form solid sodium bicarbonate precipitate and ammonium sulfate solution. Sodium bicarbonate is separated from the ammonium sulfate solution. Sodium bicarbonate is dried and is reintroduced into the scrubbing process. Fertilizer crystals are mixed with a binder in a rotating pan to form round fertilizer granules. The process is called pan granulation. The ammonium sulfate solution is evaporated to form crystals that are then granulated. Ammonium sulfate can be upgraded into potassium sulfate and other fertilizer products. Fertilizer granules are dried to less than 0.1% moisture and screened for proper size. Fertilizer granules are stored and ready for shipment. The high quality, durable granules are free of dust and flow easily into modern agricultural and turf equipment.