Release of alkali metals during biomass thermal conversion

Research output: Contribution to journalArticle

Abstract

Biomass has great potential to become an economic source of renewable energy; however, its high chlorine and alkali metal content may cause series problems (e.g. slagging and corrosion) thus limiting its utilization. This paper reviews the release of potassium during biomass thermal conversion. Organic potassium is released first when the temperature is relatively low, starting at about 473 K and slowing down at about 773 K; the release of inorganic potassium occurs with the increase of processing temperature. The potassium vapors are mainly in the form of KCl, KOH and K 2 SO 4 . In addition to the temperature, the properties of biomass feedstock, fuel-air ratio, pressure and heating rate also significantly influence the release rate of alkali metals. Future studies are required to develop accurate kinetic models of potassium release to address the ash related challenges when firing and co-firing biomass with high inherent alkali content.
LanguageEnglish
Pages1-3
Number of pages3
JournalArchives of Industrial Biotechnology
Volume1
Issue number1
Publication statusPublished - 29 Nov 2016

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Alkali Metals
Bioconversion
Alkali metals
Potassium
Biomass
Ashes
Chlorine
Alkalies
Heating rate
Temperature
Feedstocks
Vapors
Hot Temperature
Corrosion
Economics
Kinetics
Processing
Air

Keywords

  • biomass
  • alkali metal
  • release mechanism

Cite this

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Release of alkali metals during biomass thermal conversion. / Cao, Wenhan; Li, Jun; Lue, Leo; Zhang, Xiaolei.

In: Archives of Industrial Biotechnology, Vol. 1, No. 1, 29.11.2016, p. 1-3.

Research output: Contribution to journalArticle

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AB - Biomass has great potential to become an economic source of renewable energy; however, its high chlorine and alkali metal content may cause series problems (e.g. slagging and corrosion) thus limiting its utilization. This paper reviews the release of potassium during biomass thermal conversion. Organic potassium is released first when the temperature is relatively low, starting at about 473 K and slowing down at about 773 K; the release of inorganic potassium occurs with the increase of processing temperature. The potassium vapors are mainly in the form of KCl, KOH and K 2 SO 4 . In addition to the temperature, the properties of biomass feedstock, fuel-air ratio, pressure and heating rate also significantly influence the release rate of alkali metals. Future studies are required to develop accurate kinetic models of potassium release to address the ash related challenges when firing and co-firing biomass with high inherent alkali content.

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