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Evaluation of Reclaimer Sludge Disposal from CO₂ PCC Process

Technical Report

1 March 2014

Capture

Andrew J. Sexton , Kevin S. Fisher , Anne I. Ryan , Paul Nielsen , Gary T. Rochelle , Eric Chen , Katherine Dombrowski , Jean Youngerman , William A. Steen , Douglas Orr

Citation: IEAGHG, "Evaluation of Reclaimer Sludge Disposal from CO₂ PCC Process", 2014-02, March 2014.

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Publication Overview

In this study different solvent reclaiming technologies were evaluated for two reference power plants: Supercritical Pulverised Coal (SCPC) and Natural Gas Combined Cycle (NGCC) at their respective gross power outputs (900 and 810 MWe, respectively). A low sulphur Australian coal was used for SCPC case. A selective catalytic removal (SCR) unit is assumed upstream of the CO₂ capture unit for both the coal and natural gas power plants. In addition a wet flue gas desulfurization (FGD) unit and a sodium hydroxide polishing unit , is located upstream of the CO₂ capture unit in the coal-fired power plant thus reducing the SOx concentration to 10 ppmv or less .

Publication Summary

  • For amine based solvents such as: monoethanolamine (MEA), piperazine (PZ), and methyldiethanolamine/piperazine (MDEA/PZ), oxidative degradation contributes more to solvent loss than thermal degradation or volatile losses.
  • For coal based power plants, thermal reclaiming may be the preferred option whereas for natural gas based power plants an ion exchange and electrodialysis solvent reclaiming process is the preferred option.
  • Based on US regulations the coal-fired thermal reclaimer waste is likely to be classified as hazardous due to the presence of metals, whereas thermal reclaimer waste from NGCC will be classified as non-hazardous.
  • Under US regulations waste streams from the ion exchange and electrodialysis reclaiming process will not be classified as hazardous.
  • In EU all type of reclaimer waste will be categorized as hazardous.
  • There are sustainable ways available to dispose of reclaimer waste such as: by landfilling, combustion in a waste incinerator, firing in a cement kiln, co-firing at the power plant and handing in the waste water treatment plant.

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