Unburnt carbon and ashing behavior of lignite under O2-enriched conditions

What is it about?

Oxygen-enriched combustion of coal has so far been investigated using either entrained flow reactors or fluidized-bed combustors where burning takes place rapidly due to high heating rates. On the contrary, this paper presents the results of slow burning of coal under oxygen-enriched combustion conditions. Ashing behavior of mineral matter-rich low-rank coal from Turkish Tekirdag-Malkara lignite under oxygen-enriched conditions was investigated to determine the effect of this combustion technique on unburnt carbon, mineralogical characteristics and the burning performance. These experiments showed that the influence of O2 concentration on ashing is much more evident than the temperature during oxygenenriched combustion.

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Why is it important?

This paper is important from the following points of views: Oxy-fuel combustion of lignite under slow burning conditions was studied, Ashing behavior of mineral matter rich coal was explained. Comparative study in O2 concentration and temperature during oxy-fuel combustion was performed. Unburnt carbon reduction at low temperatures was revealed.