<p>Biomass is an organic-based fuel that stands out with its low-polluting properties and renewable nature compared to coal. Co-firing of biomass with coals is a practical and cost-effective application. On the other hand, when wood is burned alone, their raw materials are depleted faster, and it leads to some problems such as corrosion due to its high alkalinity content. Therefore, the existence of coal boilers can be used for the burning of biomass-coal mixtures with minor modifications without the need for the design and construction of biomass combustion boilers.<br></p>