Preludium 3
Effect of fly ashes from flue gas denitrification process on the course of hydration and formation of properties of grouts and mortars
Domestic project:
Acronym: Preludium 3
Programme: National Centre of Science, competition Preludium 3
Contract No.: UMO-2012/05/N/ST8/02810
Project implementation period of time: 12.02.2013 – 11.04.2016
Total value of the project: PLN 99 700
ITB’s budget: PLN 99 700
Coordinator on behalf of ITB: Agnieszka Michalik, MSc Eng.
Leader: Instytut Techniki Budowlanej
Short description: the aim of the research project was to determine the impact of the addition of fly ash from the flue gas denitrification process by selective non-catalytic reduction using carbamide on the course of hydration and shaping the physicochemical properties of cement slurries and mortars.
The summing up the results of the project an Open Access Article „Ammonia in Fly Ashes from Flue Gas Denitrification Process and its Impact on the Properties of Cement Composites” by Agnieszka Michalik, Joanna Babińska, Filip Chyliński and Artur Piekarczuk, 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 analysed range does not limit the use of fly ash as an additive to cement and concrete.
The implementation of the project provided new knowledge about the changes that occur in fly ash after the introduction of additional installations for reducing NOx compounds using carbamide to coal combustion processes. The comprehensive approach to the proposed work contributed to the development of science by expanding information on the impact of exhaust gas denitrification processes on the quality of coal combustion by-products. The project work enabled a comparative analysis of cement hydration processes in the presence of new waste materials.
