**4. Conclusions**

This study aimed to fundamentally investigate the ash deposition behavior during co-combustion of coal with two kinds of biomasses, WP and EFB, using TMA and DTF. The conclusions are as follows.


melting temperature with increasing WP and EFB blending, and the slagging/fouling tendency was expected to increase gradually.


**Author Contributions:** Conceptualization, T.-Y.J. and C.-H.J.; data curation, T.-Y.J. and C.-H.J.; investigation, T.-Y.J., L.S., and J.-H.K.; methodology, T.-Y.J. and B.-H.L.; project administration, C.-H.J.; supervision, C.-H.J.; validation, T.-Y.J., L.S., J.-H.K., and B.-H.L.; visualization, T.-Y.J. and L.S.; writing—original draft, T.-Y.J.; writing—review and editing, T.-Y.J., B.-H.L., and C.-H.J.

**Acknowledgments:** This work was conducted under the framework of the research and development program of the Korea Institute of Energy Research (B9-2445).

**Conflicts of Interest:** The authors declare no conflict of interest.
