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AMMONIA ABSORPTION/AMMONIUM BISULFATE REGENERATION PILOT PLANT FOR FLUE GAS DESULFURIZATION
Citation:
Williamson, P. AND E. Puschaver. AMMONIA ABSORPTION/AMMONIUM BISULFATE REGENERATION PILOT PLANT FOR FLUE GAS DESULFURIZATION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-77/149 (NTIS PB272304), 1977.
Description:
The report gives results of a pilot-plant study of the ammonia absorption/ammonium bisulfate regeneration process for removing SO2 from the stack gas of coal-fired power plants. Data were developed on the effects of such operating variable in the absorption of SO2 by ammoniacal liquor as: temperature and flyash content of inlet flue gas, pH of recirculating absorber liquor, and oxidation of sulfite to sulfate in absorber liquor. An equation was developed for operating conditions that should prevent fume formation in the absorber; however, consistent plumeless pilot-plant operation was not achieved. Acidulating and stripping equipment and operating conditions were developed for recovering 99+% of the SO2 in the absorber product liquor as a gas of suitable concentration for processing to sulfuric acid or elemental sulfur. The proposed study of electrical decomposition of ammonium sulfate to recover ammonia and ammonium bisulfate for recycling was not undertaken because of indicated high energy requirements and unfavorable economics. It is recommended that any further work involving SO2 removal with ammonia be directed toward a noncyclic process with production of ammonium sulfate.