Journal
FUEL
Volume 231, Issue -, Pages 417-426Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2018.05.110
Keywords
Coal; Biomass; Mineral matter; Ash fusion process; CO2 atmosphere
Categories
Funding
- National Youth Science Foundation of China [21206104]
- National Natural Science Foundation of China [21376158, U1610221]
- National Foreign Expert Bureau in China by the High-End Foreign Experts' Project in China [GDW20161400003]
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The ash fusion process of Jincheng anthracite ash, rice straw ash and coal-biomass ashes with different rice straw ash addition ratios during co-gasification under CO2 atmosphere was elucidated by the ash fusion test, chemical analyses, optical heating stage microscopy (OHSM), X-ray diffraction and scanning electron microscopy equipped with energy-dispersive X-ray analyzer. Results showed that the initial sintering and initial melting temperatures of coal-biomass ashes observed by OHSM decreased with the addition of rice straw ash. The deformation temperatures determined by the ash fusion test were close to the initial melting temperatures. The biomass ash addition to coal ash introduced excessive amounts of alkaline compounds in the ash mixtures that led to lower initial temperatures of liquid phase formation. The ash fusion behavior of coal-biomass ashes with a rice straw ash addition <= 3 wt% was similar to that of coal ash and fits to the softening-melting ash fusion mechanism. In contrast, the ash fusion behavior of coal-biomass ashes with a greater addition of rice straw ash (>3 wt%) experienced dramatic changes at lower temperature and fits to the melting-dissolution'' ash fusion mechanism.
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