Investigation of ash deposition in a pilot-scale fluidized bed combustor co-firing biomass with lignite


Gogebakan Z., Gogebakan Y., SELÇUK N., Seliuk E.

BIORESOURCE TECHNOLOGY, vol.100, no.2, pp.1033-1036, 2009 (Peer-Reviewed Journal) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 100 Issue: 2
  • Publication Date: 2009
  • Doi Number: 10.1016/j.biortech.2008.07.037
  • Journal Name: BIORESOURCE TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.1033-1036
  • Keywords: Biomass, Lignite, Co-firing, Fluidized bed combustion, Ash deposition, RESIDUE, STRAW, FUEL

Abstract

This study presents the results from investigation of ash deposition characteristics of a high ash and sulfur content lignite co-fired with three types of biomass (olive residue, 49 wt%; hazelnut shell, 42 wt%; and cotton residue, 41 wt%) in 0.3 MWt Middle East Technical University (METU) Atmospheric Bubbling Fluidized Bed Combustion (ABFBC) Test Rig. Deposit samples were collected on all air-cooled probe at a temperature of 500 degrees C. Samples were analyzed by SEM/EDX and XRD methods. The results reveal that co-firing lignite with olive residue, hazelnut shell and cotton residue show low deposition rates. High concentrations of silicon, calcium, sulfur, iron, and aluminum were found in deposit samples. No chlorine was detected in deposits. Calcium sulfate and potassium sulfate were detected as major and minor components of the deposits, respectively. High sulfur and alumina-silicate content of lignite resulted in formation of alkali sulfates instead of alkali chlorides. Therefore, fuel blends under consideration can be denoted to have low-fouling propensity. (c) 2008 Elsevier Ltd. All rights reserved.