Co-combustion of biocoal and lignite in a circulating fluidised bed combustor to decrease the impact on global warming

Keivani B., OLGUN H., ATİMTAY A.

INTERNATIONAL JOURNAL OF GLOBAL WARMING, vol.18, no.2, pp.120-137, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 18 Issue: 2
  • Publication Date: 2019
  • Doi Number: 10.1504/ijgw.2019.100313
  • Journal Name: INTERNATIONAL JOURNAL OF GLOBAL WARMING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.120-137
  • Keywords: biomass, torrefaction, biocoal, oxygen enriched combustion, circulating fluidised bed combustion, OXYGEN-ENRICHED COMBUSTION, BIOMASS, COAL, TORREFACTION, EMISSION, SYSTEM, NO
  • Middle East Technical University Affiliated: Yes

Abstract

This work covers co-combustion of biocoal obtained from red pine wood chips with Orhaneli lignite in a 30 kW-thermal capacity circulating fluidised bed combustor (CFBC) system in air and oxygen-enriched atmosphere. The combustor was of 108 mm inside diameter and 6 m height. The combustion temperature was held at 850+50 degrees C. Oxygen enriched combustion tests were carried out at different ratios of lignite and biocoal mixtures. Biocoal share in the fuel mixture was increased up to 50% by wt. It was found that the fuel mixtures up to 50% by wt. of biocoal were combusted effectively in the system. The oxygen concentration in the oxidant was varied between 21 and 27% by vol. for the oxygen-enriched combustion experiments. The results showed that biocoal can be a good additive fuel to lignite coal and oxygen-enriched co-combustion is an option for reducing flue gas emissions of SO2, CO and N2O.