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3rd Meeting of the Oxy-Combustion Network

Technical Report

1 November 2008

Capture

Event Proceedings

IEAGHG

Citation: IEAGHG, "3rd Meeting of the Oxy-Combustion Network", 2008-05, November 2008.

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Publication Overview

This report presents an overview of the workshop and summarises the current status of development of oxy-fuel combustion. The presentations and discussions at the workshop covered a wide range of topics looking at; on-going studies and experimental results, modelling studies, new developments in oxygen production and CO₂ processing, and identification of various issues relevant to the demonstration of oxy-fuel combustion technology.

Publication Summary

During the 3rd network workshop several major developments were reviewed, and new results are presented. These new developments included:

  • In the area of development in oxy-fuel combustion burners and boilers (including emissions) it has been demonstrated that SO3 emissions will be significantly higher compared to air firing. Increases in H2S formation in the furnace are a possible impact of SO2 accumulation due to flue gas recycle, however evidence of increased sulphur capture in the ash may be coal specific. Lower ash carbon contents have been observed with oxy-fuel combustion. Whilst, new SEM measurement data indicates that with oxy– fuel combustion larger particle sizes are formed during char burnout and ash formation.
  • Development activities in oxy-CFB have gathered pace. This is primarily driven by two of the major large scale projects recently announced the CIUDEN Project in Europe and the Jamestown Project in the USA.
  • Industrial gas companies (notably Air Liquide and Air Products) have confirmed that they are now offering improvements in the specific energy consumption of oxygen production from their cryogenic Air Separation Units (reduced from 200-220 kWh/tonne O2 to 150-170 kWh/tonne O2 by 2009–2010).
  • New experimental results have been presented on the phase equilibria involving binary mixtures of CO₂ with various impurities. These results will aid in the validation of the coefficients used in the different equations of state (i.e. Peng Robinsons EOS). Further unresolved issues on this topic have been identified (for example the coefficients suggested for N2O4 and CO₂ mixture presented in 1901 literature should be further verified). On-going work/studies will be implemented within this year has been noted.

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