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Open AccessArticle

Ammonia in Fly Ashes from Flue Gas Denitrification Process and its Impact on the Properties of Cement Composites

Building Structures, Geotechnics and Concrete Department, Instytut Techniki Budowlanej, Filtrowa 1, 00-611 Warsaw, Poland
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Buildings 2019, 9(11), 225; https://doi.org/10.3390/buildings9110225
Received: 28 August 2019 / Revised: 18 October 2019 / Accepted: 24 October 2019 / Published: 26 October 2019
(This article belongs to the Special Issue Advances in Sustainable Building Material Engineering)
The paper presents the results of research on the properties of fly ashes from the process of flue gas denitrification by selective non-catalytic reduction (SNCR), consisting of dosing urea into the coal combustion chamber. The research was carried out on two types of fly ash: Silica fly ash from flue gas denitrification and ash from a traditional boiler without the flue gas denitrification process. The scope of comparative studies included physicochemical and structural features of ashes, as well as slurries and mortars with the addition of ashes. Fly ash from denitrification, whose ammonia content at the time of sampling was 75 mg/kg at the maximum, was examined. Our own research has shown that fly ash from flue gas denitrification is characterized by a higher value of losses on ignition and ammonia content in comparison to ashes without denitrification. It was shown that the ammonia content in the analyzed range does not limit the use of fly ash as an additive to cement and concrete. View Full-Text
Keywords: siliceous fly ashes; ammonia slip; selective non-catalytic reduction (SNCR); selective catalytic reduction (SCR); denitrification process siliceous fly ashes; ammonia slip; selective non-catalytic reduction (SNCR); selective catalytic reduction (SCR); denitrification process
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Michalik, A.; Babińska, J.; Chyliński, F.; Piekarczuk, A. Ammonia in Fly Ashes from Flue Gas Denitrification Process and its Impact on the Properties of Cement Composites. Buildings 2019, 9, 225.

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