Physical and chemical characteristics of particulate matter (pm1) emitted from combustion of a bituminous coal in air and oxy-fuel environments

2013-05-22
This work examined the physical and chemical characteristics of submicron particulate emissions (PM1) from pulverized bituminous coal burning under either conventional air or oxyfuel conditions. Oxy-fuel combustion is a process that takes place in O2/CO2 environments, which are achieved by removing nitrogen from the intake gases and recirculating large amounts of flue gases to the boiler; this is done to moderate the high temperatures caused by the elevated oxygen partial pressure therein. In this study, combustion took place in a laboratory laminar-flow drop-tube furnace (DTF) in environments in either air or oxy-fuel conditions. A Pittsburgh bituminous coal was burned at a DTF temperature of 1400 K. Scanning Electron Microscope (SEM) was used to observe the morphology of the submicron particles and SEM coupled with Energy Dispersive X-ray Spectroscopy (SEM-EDS) technique was used for the chemical analysis of the PM1. Bimodal ash particle size distributions were observed in the submicron region. Mass fractions of the major metal oxides in submicron ash particles also showed a bimodal distribution. Both the submicron emission yield and the major metal oxides in the submicron particles were typically lower in oxy-fuel condition than those in air. S was the preeminent component of the PM0.1-0.18 (stage 9) while Si and Al were the greatest component of the PM0.56-1 (stage 6). Scanning Electron Microscopy (SEM) revealed that submicron particles were spherical which is attributed to vaporization of minerals followed by condensation and particle growth.

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Citation Formats
F. Kazanç Özerinç, “Physical and chemical characteristics of particulate matter (pm1) emitted from combustion of a bituminous coal in air and oxy-fuel environments,” presented at the 8th US National Combustion Meeting 2013, Utah, USA, 2013, Accessed: 00, 2021. [Online]. Available: https://sutherland.che.utah.edu/USCI2013/PAPERS/1H05-070EN-0270.pdf.