The state of sodium and potassium in the pressurized fluidized-bed combustion and gasification of peat

Wahab Mojtahedi, Rainer Backman

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Multicomponent multiphase equilibrium calculations were carried out for pressurized fluidized-bed combustion and gasification conditions to determine the relative distribution of the alkali methals (sodium and potassium) in the gas and condensed phases.
The dependence of alkali volatilization on operating temperature, pressure, total alkali content and chlorine content of the feedstock was studied. Alkali release in the vapour phase may be much higher than is acceptable to a gas turbine, especially in gasification conditions.
Therefore the need to remove the volatilized alkali metal compounds is more acute in gasification than in combustion. The results are also compared with the measured alkali content of the effluent stream of a pressurized fluidized-bed combustor.
Original languageEnglish
Pages (from-to)189-196
JournalJournal of the Institute of Energy
Volume62
Issue number453
Publication statusPublished - 1989
MoE publication typeA1 Journal article-refereed

Keywords

  • gasification

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