AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
Ash Formation in High Pressure Oxy-Combustion Systems
DISHANT KHATRI, Zhiwei Yang, Richard Axelbaum, Washington University in St. Louis
Abstract Number: 835 Working Group: Combustion
Abstract The Pressurized Oxy-Combustion (POC) process is receiving tremendous amount of attention as it is regarded as the technology for reducing CO2 emissions with possibly increase in the total efficiency over atmospheric oxy-combustion. Although a promising technology for power generation, the impact on pollutants, such as the particulate matter (ash) has not yet been established at higher pressures. Therefore, in this work, the formation and evolution of fine ash particles will be evaluated in a pressurized oxy-combustor designed for a new POC technology staged pressurized oxy combustion (SPOC). The coal is fed dry using a screw feeder. A three stage high pressure sampling dilution system is designed to take the ash sample at the bottom of the pressurized combustor. The effect of pressure on ash formation is understood by varying the pressure of the system from 1 to 15 Bar. The effect of firing rate is understood by keeping pressure constant but changing the thermal input from 50 KW to 100 KW. The particle size distributions were measured using a Scanning Mobility Particle Sizer and an Electrical Low Pressure Impactor. The impactor also collected ash samples for the Scanning Electron Microscope and Energy-dispersive X-ray Spectroscopy to analyze size-segregated compositions. The experimental data, along with analytical models will help to understand the observed trends during these studies.