Abstract
This paper was addressed to evaluate the sintering behavior of coal ash at different temperatures under oxy-fuel combustion (O2/CO2 combustion) atmosphere. A lignite (Zhundong coal) characterized by high sodium level has been applied as the fuel material. The raw ash was heat treated at four different temperatures: 1350, 1300, 1250, and 1200°C, respectively. In addition, two atmospheres has been applied to as the reaction atmosphere: (1) 30vol.% O2/70vol.% CO2 (oxy-firing); (2) air (reference). Meanwhile, the shape of the sintered ash samples during the sintering process was monitored by charge coupled device (CCD). The shrinkage of height and area of sintered samples can be obtained by the image processing system. In addition, the microstructure and chemical compositions of the sintered samples were analyzed by a scanning electron microscope (SEM) equipped with energy dispersive X-ray spectrometry (EDX). Moreover, the distribution of mineral phases in the sintered samples was identified by X-ray diffraction (XRD). The results show that the sintering degree of the samples increases with temperature. In addition, all the samples are characterized by layer structure with different colors. Meanwhile, the XRD results reveal that the oxy-fuel combustion atmosphere did not change dramatically the kinds of mineral phases, but did influence the relative amount of crystalline phases.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
