Thermal power stations employ flue gas conditioning (FGC) technique to reduce the emission of suspended particulate matter in the surrounding atmosphere substantially. This technique involves the treatment of flue gases by adding the chemical agents (viz., ammonia and/or sulfur trioxide) to the flue gas, which in turn increases the collection efficiency of electrostatic precipitators. Since the pozzolanic activity of the fly ash is important for its suitability as a cementitious material in the construction industry, the presence of residual ammonia in fly ash may adversely affect its utilization. Hence, it becomes mandatory to establish the presence of residual ammonia in the fly ash, and its influence on the pozzolanic activity of the fly ash needs to be studied in details. With this in view, fly ash samples from coal based thermal power stations in India, where FGC is being done, were collected, and the residual ammonia as well as pozzolanic activity was determined. Based on these investigations, it has been demonstrated that the influence of residual ammonia from FGC on pozzolanic activity of the fly ash is insignificant.
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