Projects per year
Abstract
In this work, an inclined plate technique was used to investigate the slagging propensity of bio-ashes and the flowability of the resulting bio-slags in a reducing gas environment at 1300 °C. A number of different approaches were trialled to visualise and measure the slagging propensity of bio-ash as a function of MgO content, as well as their comparison with reference coal ashes and several synthetic ashes generated by blending bio-ash with CaO, Al2O3, SiO2 and K2O individually and/or collectively. As has been found, the presence of 6–16 wt% MgO in bio-ash and coal ash exerted little influence on the ash fusion temperature. However, the slag flowability is slow for a relatively high viscosity of the bio-slags. In contrast, the coal slags flew much faster, although the formation of spinel crystals was confirmed in the high MgO content. Among the major basic oxides within bio-ash and coal ash, CaO is most influential in depolymerising ash matrix to promote its flowability. In contrast, the presence of Fe2O3 is subtle, a small increase of whose content can cause the interaction with MgO for the formation of crystallised spinel. The co-presence of K2O and Al2O3 is the most negative, causing a significant decrease in the slag flowability. Finally, regarding the traditional methodologies for ash study, the base/acid (B/A) ratio for an overall balance between basic and acid oxides is unable to differentiate the discrepancy between coal ash and bio-ash. Likewise, the thermodynamic equilibrium prediction on liquidus amount and viscosity should be deemed as the empirical index that overlooks the kinetic control and formation of crystalline for the Mg-rich ash samples.
Original language | English |
---|---|
Article number | 124207 |
Number of pages | 13 |
Journal | Fuel |
Volume | 322 |
DOIs | |
Publication status | Published - 15 Aug 2022 |
Keywords
- Bio-slag
- Inclined plate
- Magnesium oxide
- Slag flowability
Projects
- 1 Finished
-
ARC Research Hub for Energy-efficient Separation
Wang, H., Zhang, X., Duke, M. C., Hill, M., Leslie, G. L., Diniz da Costa, J. C., Gray, S. R., Nghiem, L., Millar, G., Kong, L., Liu, S., Shon, H. K., Le-Clech, P., Zhang, L., Hoadley, A., Smart, S., Dumee, L., Thornton, A. W., Ozcakmak, B., Bury, P., Stephen, G., Fane, A., Elimelech, M., Pan, B., Tao, S., Horton, A., Wu, X., Forbes, M., Hu, J., Song, H., Dixon, I., Holt, S. A., He, L., Williams, C., Hou, H., Shen, W., Wang, J., Gao, L., Davis, P., Pham, H., Muthukumarn, S., Bustamante, H. & Thang, S. H.
Barwon Region Water Corporation (trading as Barwon Water) (Victoria) , South East Water Corporation (trading as South East Water Ltd (SEWL) (Victoria), Tasmanian Water and Sewerage Corporation Pty Ltd (trading as Tas Water), Advanced Fuel Innovation Pty Ltd, CSL Behring (Australia), Yale University, 2D Water Pty Ltd, Activated Water Technologies Pty Ltd, Akvotek Pty Ltd, Bioactive Materials Pty Ltd, Australian Nuclear Science and Technology Organisation (ANSTO) , Arrow Bowen Pipeline Pty Ltd (trading as Arrow Energy), Baosteel Group Corporation, Ironwood Clean Energy Technologies Pty Limited (trading as: Carbon Technologies Australia), Shenzhen Innova Nanobody Company, Shanghai Boiler Works Co Limited, Shijiazhuang Chang’an Yucai Building Materials Ltd. Company, Zeolite Australia Pty Limited, University of Technology (UTS) Sydney
15/12/17 → 15/12/23
Project: Research
Equipment
-
Centre for Electron Microscopy (MCEM)
Flame Sorrell (Manager) & Peter Miller (Manager)
Office of the Vice-Provost (Research and Research Infrastructure)Facility/equipment: Facility