SCR deactivation in a full-scale cofired utility boiler

Effects of existing energy saving and air pollution control devices on mercury removal in coal-fired power plants

“…5. The SCR catalysts are always exposed to high temperature and dusty surroundings before the preheater in the coal-fired power plants, thus the catalytic activity would be decreased because of sintering and poisoning by alkali and alkaline earth metals (AAEMs) [51]. The AAEM salts plug the pores and reduce the acidity of the catalytic sites [22,52].…”

The influence of poisoning on the deactivation of DeNOx catalysts

“…Strege et al [22] showed under industrial conditions that the main ash accumulation was at the entrance of the pores. In the case of the catalysts studied in this paper, some channels of the monolith were totally closed (cf.…”

“…The differences were explained by Sahu et al [4] who claimed that different fuel characteristics, the gas atmosphere and the used combustion technology influenced the composition of fly ash. Anhydrite and minor amounts of quartz were found, e.g., by Strege et al [22] in ash scraped from the surface of catalyst exposed to flue gas from utility boiler co-firing wood waste and coal and by Koukouzas et al [23] in fly ash from a pilot-scale fluidized boiler firing coal, wood chips and their blends. Mishra and Das [24] reported, for coal-derived fly ash, mullite, quartz and hematite as the main crystalline phases.…”

Transformations of mercury in processes of solid fuel combustion – review

“…Wu and co-authors also highlighted oxidation effi ciency reaching 71% in the SCR systems. By means of the wet FGD without SCR, it was possible to capture 54.9-68.8% of total mercury, while with the SCR system the mercury removal effi ciencies ranged from 78% to 90.2% (Winberg et al 2004, Eom et al 2008, Strege 2008.…”