Program topic: 1. Combustion particulate formation from pulverized coal under oxy-fuel combustion conditions

Yunlu Jia, Joann S. Lighty

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Aerosol particulates are one of a variety of products generated by coal combustion. Combustion conditions can affect the formation of aerosol particulates, specifically, size distribution, amount, and composition. Understanding the formation of fine particulates is important for predicting emissions and understanding potential deposition. Oxy-fuel coal combustion conditions provide exhaust gas with a high concentration of CO2 versus CO2/N2 due to the recycled flue gas. The hypothesis is that this high CO2 concentration reduces the vaporization of refractory oxides from combustion according to the reaction: MOn(s) + CO(g) ↔ CO2(g) + MOn-1(g). This research investigated particulate formation in a drop tube furnace under different flue gas scenarios. Ash particulate formation has been studied as a function of furnace temperature, coal type, and gas phase conditions, namely, CO2 versus N2. A Scanning Mobility Particle Sizer (SMPS) and an Aerodynamic Particle Sizer (APS) were utilized for ash particle size distributions in sizes ranging from 14.3 nm to 20 microns. In addition, particles were collected on an eleven-stage, Berner Low Pressure Impactor (BLPI) for elemental analysis using Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). Ultra fine ash deposition was directly related to temperature, increasing with increasing temperature. The results showed a change of particle size for high calcium and silicon coals as hypothesized.

Original languageEnglish
Title of host publication28th Annual International Pittsburgh Coal Conference 2011, PCC 2011
Pages1005-1013
Number of pages9
StatePublished - 2011
Event28th Annual International Pittsburgh Coal Conference 2011, PCC 2011 - Pittsburgh, PA, United States
Duration: 12 Sep 201115 Sep 2011

Publication series

Name28th Annual International Pittsburgh Coal Conference 2011, PCC 2011
Volume2

Conference

Conference28th Annual International Pittsburgh Coal Conference 2011, PCC 2011
Country/TerritoryUnited States
CityPittsburgh, PA
Period12/09/1115/09/11

Keywords

  • Ash formation
  • Coal combustion
  • Elemental analysis
  • Oxyfuel

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