Experiment and Thermodynamic Analysis on Mineral Formation of Cement Clinker Cogeneration from Coal in Pulverized Coal Combustion Boiler

Abstract:

Take Changguang high-sulfur coal as experimental coal type; carry out the experiment of mineral formation rule of co-generation cement clicker on two-section multiphase reaction test stand and conduct XRD, SEM and EDS analyses on the mineral composition of the obtained co-generation clicker sample. It can be found from the experimental results that the mineral composition of co-generation clinker presents great difference with the temperature change in the furnace on the test stand; when the temperature in the furnace reaches to 1,330°C, the main mineral species in co-generation clinker sample are 2CaO•SiO₂, Q phase and 3CaO•3Al₂O₃•CaSO₄ with excellent hydration activity. Conducted thermodynamic calculation on the mineral formation reaction probably occurring in the chemical compositions of Q-phase cement clinker co-generated from Changguang coal. It is shown in the findings of computational analyses that, according to the chemical composition of clinker, the direct synthesis reaction of 2CaO•Al₂O₃•SiO₂ firstly occurs, followed by the direct synthesis reaction of 2CaO•SiO₂, the next is the indirect synthesis reaction of Q-phase mineral, and the last is the indirect synthetic reaction of 3CaO•3Al₂ O₃•CaSO₄; the final main mineral compositions of co-generation clinker should be 2CaO•SiO₂, Q phase and 3CaO•3Al₂O₃•CaSO₄. The conclusion of thermodynamic analyses on co-generation clicker mineral formation reaction basically conforms to the mineral composition in experiment of Changguang coal co-generating Q-phase cement clinker.

• Periodical: Advanced Materials Research (Volumes 354-355)
• Pages: 240-245
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.354-355.240
• Online since: October 2011
• Authors: You Zhou Jiao, Zheng Lun Shi
• Keywords: Cogeneration, Pulverized Coal Combustion Boiler, Q-Phase Cement Clinker, Thermodynamic

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