Journal
FUEL
Volume 260, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2019.116369
Keywords
Coal ash with high silica and alumina levels; CaO/Fe2O3; Ash fusibility; Prediction of flow temperature
Categories
Funding
- Joint Foundation of Natural Science Foundation of China and Shanxi Province [U1510201, U1810127]
- NSFC-DFG [21761132032]
- Joint Foundation of the Natural Science Foundation of China and Xinjiang Province [U1703252]
- Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering [2017-K21]
- Youth Innovation Promotion Association, CAS [2011138]
- Natural Science Foundation of Shanxi Province [201703D421033]
- International Partnership Program of Chinese Academy of Sciences [122214KYSB20170020]
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Ash fusibility which is usually investigated and evaluated by the ash chemical compositions is widely used to guide the coal selection in boiler and gasifier. Calcium and iron are the main basic oxides in coal ash, which tend to decrease ash fusion temperatures (AFTs). However, the change of AFTs varied with CaO/Fe-2 O-3 mass ratio is not yet revealed. In this work, effect of CaO/Fe2O3 ratio on the fusibility of ash with high silica and alumina levels was explored under weak reducing atmosphere (CO: CO2 = 3/2, volume ratio). Thermodynamic calculations were applied to investigate the fusion behavior. A general rise of AFTs with the increasing CaO/Fe2O3 ratio was verified, especially for the coal ash with low SiO2 + Al2O3 level and SiO2 /A1(2)O(3) mass ratio. Mullite and anorthite are main refractory minerals phase of the ash samples with high SiO2 and Al(2)O(3 )levels. The fusion of the ash in anorthite primary phase is the soft-melting mechanism, and liquidus temperature was well used to predict flow temperature (FT). However, the liquidus temperature should not be used to predict FT of the ash in mullite primary phase due to the melting-dissolve mechanism. A T-mullite model was proposed to predict FT for the ashes in mullite primary phase. The deviation of predicted and measured FT was within the measuring error range ( +/- 40 degrees C), which was supported by 25 real coal ashes.
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