Abstract
Preheated air could improve the coal gas heating value and gas quality but, meanwhile, may cause slagging in the gasifier as a result of the enrichment of sodium in the ash. In this work, the migration and transformation of sodium during the Zhundong coal circulating fluidized bed gasification with different air-preheated temperatures were investigated. During the Zhundong coal gasification at 940 °C, with the air-preheated temperature increased from 20 to 600 °C, the air equivalent ratio decreased from 0.52 to 0.38 and the sodium content in the bottom ash increased 62.99%, 425.58% for circulating ash, and 44.02% for fly ash as a result of the effect of carbon inhibition. Accordingly, the release fraction of gaseous sodium decreased 42.82%. The condensation of gaseous sodium started at 800 °C of the coal gas temperature and reached a maximum at about 700 °C. The turning point of the temperature increased with the increase of the air-preheated temperature. The air-preheated temperature had little influence...
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