Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Used Tires as Fuel in Clinker Production: Economic and Environmental Implications

Version 1 : Received: 12 August 2021 / Approved: 13 August 2021 / Online: 13 August 2021 (15:11:16 CEST)

How to cite: Castañón, A.M.; Sanmiquel, L.; Bascompta, M.; Vega y de la Fuente, A.; Contreras, V.; Gómez Fernández, F. Used Tires as Fuel in Clinker Production: Economic and Environmental Implications. Preprints 2021, 2021080300 (doi: 10.20944/preprints202108.0300.v1). Castañón, A.M.; Sanmiquel, L.; Bascompta, M.; Vega y de la Fuente, A.; Contreras, V.; Gómez Fernández, F. Used Tires as Fuel in Clinker Production: Economic and Environmental Implications. Preprints 2021, 2021080300 (doi: 10.20944/preprints202108.0300.v1).

Abstract

The objective of this work is to compare how the gases emitted during the manufacture of the clinker vary in a cement plant, using two types of fuel: petroleum coke and unusable tires (UTs). The study is based on a case study using real time data on more than 40 process variables. Gases are analysed from two points of the production process: Sintering Kiln, main focus of emission to the atmosphere by chimney, and Preheater. The variation of CO and NOx depending on the oxygen and fuel type is studied. The SO2 levels are also analyzed, observing a decrease when using the UTs. The quality of the Clinker has been compared depending on the fuel type. The results are compared, on the one hand, with the quality of the clinker, determined by the content of the majority (C3S, Alite) and minority (Free CaO) phases, and, on the other hand, with the Kiln sintering temperature, the most influential parameter in the productive process. It is verified that Clinker quality is maintained, regardless of the type of fuel used. Concluding that the use of UTs as fuel can generate an important economic and environmental benefit for cement companies and their environment.

Keywords

clinker; used tires; pollutant gases; energy savings; environment impact

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