Release of sodium and potassium in the PFB gasification of peat

Wahab Mojtahedi, Esa Kurkela, Matti Nieminen

Research output: Contribution to journalArticleScientificpeer-review

30 Citations (Scopus)


The pressurised fluidised-bed gasification (PFBG) of peat to produce a fuel gas has been investigated as the major component of an integrated gasification combined-cycle (IGCC) power-generation system. Peat, the major indigenous solid fuel in Finland, contains alkali metals (Na and K) which are released by gasification and which have deleterious effects on the downstream hardware (eg the blades of gas turbines). Theoretical studies of the distribution and levels of alkali-metal compounds in PFB gasifier product streams are reported, followed by a comparison of the latter with measured data from a pressurised fluidised-bed gasifier of 15 cm diameter. An attempt is made to measure the volatilised alkali metals in the gasifier product gas directly after the freeboard. The measuring technique is described, and the results analysed and discussed. The development and construction of an on-line, real-time continuous alkali monitor are briefly outlined.
Original languageEnglish
Pages (from-to)95 - 100
JournalJournal of the Institute of Energy
Issue number456
Publication statusPublished - 1990
MoE publication typeA1 Journal article-refereed


  • gasification

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