Scientists develop analytical system to monitor trace elements in biomass gasification
In recent years there has been significant and high-profile interest in the use of biofuels as possible alternatives to fossil fuels, as part of a move to reduce carbon dioxide emissions. Although combustion accounts for most biofuel use, there has also been significant research into biofuel gasification, a transformation step needed to make synthetic biofuels (earlier post, and here).
However, the behaviour of trace elements during gasification can be problematic, with environmental concerns over toxic components, and process problems caused by alkali metal corrosion and fouling.
David Poole and colleagues at the University of Sheffield and SPECTRO Analytical Instruments, Germany have been conducting experiments to continuously monitor the concentration of various trace elements in the raw gasification gas from an experimental reactor (click to enlarge), in an effort to determine which elements are volatilised. They published their results in the Journal of Analytical Atomic Spectrometry [open access article].
Results of initial tests indicate that the concentration of some elements in the gas phase are extremely high, far higher than in combustion processes, and therefore are of significant concern. Owing to to problems with tar formation in the gasification process, the analysis proved extremely challenging, and further development of the sampling and pre-treatment procedure would be required to obtain more accurate, reliable, and long-term continuous monitoring results.
The German and British scientists also developed a portable, self-contained analytical laboratory for the continuous monitoring of the trace elements that are released during biofuel gasification. The system uses an inductively coupled plasma-optical emission spectrometer to measure the concentration of up to 70 elements simultaneously:
bioenergy :: biofuels :: energy :: sustainability :: gasification :: trace elements :: biomass :: biomass-to-liquids ::
'Gasification is of growing interest as this can increase the energy efficiency of biofuel use,' said Poole, 'but the behaviour of trace elements during gasification can be problematic, with environmental concerns over toxic constituents such as lead, cadmium and arsenic, and process problems caused by others such as potassium and sodium.'
High concentrations of potassium and sodium were detected, which, according to Poole, could result in fouling and corrosion of gasification plants. The heavy metals measured were not detected at significantly high concentrations. The researchers will continue to optimise and improve their analytical system, and plan to develop more automated and robust systems.
More information:
David J. Poole, Vida Sharifi, Jim Swithenbank, Paul Kilgallon, Nigel Simms, John Oakey and Dirk Ardelt, "Continuous analysis of elemental emissions from a biofuel gasifier", J. Anal. At. Spectrom., 2007 DOI: 10.1039/b616798e
However, the behaviour of trace elements during gasification can be problematic, with environmental concerns over toxic components, and process problems caused by alkali metal corrosion and fouling.
David Poole and colleagues at the University of Sheffield and SPECTRO Analytical Instruments, Germany have been conducting experiments to continuously monitor the concentration of various trace elements in the raw gasification gas from an experimental reactor (click to enlarge), in an effort to determine which elements are volatilised. They published their results in the Journal of Analytical Atomic Spectrometry [open access article].
Results of initial tests indicate that the concentration of some elements in the gas phase are extremely high, far higher than in combustion processes, and therefore are of significant concern. Owing to to problems with tar formation in the gasification process, the analysis proved extremely challenging, and further development of the sampling and pre-treatment procedure would be required to obtain more accurate, reliable, and long-term continuous monitoring results.
The German and British scientists also developed a portable, self-contained analytical laboratory for the continuous monitoring of the trace elements that are released during biofuel gasification. The system uses an inductively coupled plasma-optical emission spectrometer to measure the concentration of up to 70 elements simultaneously:
bioenergy :: biofuels :: energy :: sustainability :: gasification :: trace elements :: biomass :: biomass-to-liquids ::
'Gasification is of growing interest as this can increase the energy efficiency of biofuel use,' said Poole, 'but the behaviour of trace elements during gasification can be problematic, with environmental concerns over toxic constituents such as lead, cadmium and arsenic, and process problems caused by others such as potassium and sodium.'
High concentrations of potassium and sodium were detected, which, according to Poole, could result in fouling and corrosion of gasification plants. The heavy metals measured were not detected at significantly high concentrations. The researchers will continue to optimise and improve their analytical system, and plan to develop more automated and robust systems.
More information:
David J. Poole, Vida Sharifi, Jim Swithenbank, Paul Kilgallon, Nigel Simms, John Oakey and Dirk Ardelt, "Continuous analysis of elemental emissions from a biofuel gasifier", J. Anal. At. Spectrom., 2007 DOI: 10.1039/b616798e
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