Abstract
To determine the ash characteristics, catalysts transformation and the sintering mechanism during catalytic coal gasification, the investigation of the effect of ashing temperature, K2CO3 and CaO catalysts addition on the ash sintering behavior of bituminous coal was conducted under catalytic gasification conditions. The ash sintering temperature was determined at 3.5 MPa using a pressure-drop sintering device with H2O, H2, CO inlets. The ash morphology was analyzed using a scanning electron microscope-energy dispersive X-ray spectrometer (SEM-EDS). An X-ray diffractometer (XRD) in combination with FactSage were used to predict the reactions occurring between minerals as well as the mineral transformation and slag formation. The results showed that different ashing temperature affected both ash transformation reactions and volatilization amount of added catalyst, which influenced the ash fusion temperatures and the sintering temperature. The ash-550 °C was chosen to investigate the sintering behavior. The...
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