**5. Conclusions**

Three kinds of biomass and bituminous coal were burned in a laboratory-scale CFB combustor, and the influence of fuel type and oxidizing atmosphere on pollutant emissions were studied. Pellets were burned in air and oxy-combustion environments (oxy-21, oxy-30 and oxy-40) at 850 ◦C. The major conclusions from this study are as follows:

1. The instantaneous emissions of SO2, N2O and CO for the combustion of biomass fuels in all atmospheres were lower than those for the combustion of bituminous coal.


**Author Contributions:** Conceptualization, M.K.-G., A.K.-K. and A.L.; methodology, M.K.-G.; formal analysis, M.K.-G. and A.K.-K.; investigation, M.K.-G. and A.K.-K.; writing—original draft preparation, M.K.-G.; writing—review and editing, M.K.-G. and A.L.; project administration, M.K.-G.; funding acquisition, M.K.-G. All authors have read and agreed to the published version of the manuscript.

**Funding:** Funds to cover costs of publishing in an open access journal were provided by the statute subvention of Czestochowa University of Technology, Faculty of Mechanical Engineering and Computer Science, Department of Thermal Machinery.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Acknowledgments:** The results presented in this paper were obtained from research work cofinanced by the National Science Centre (Poland) based on the decision No. DEC-2012/07/B/ST8/03730. The support is gratefully acknowledged.

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