New and renewable energy usage is expanding, but thermal power plants are still critical as a stable power source. For coalfi

red power plants to play a role in responding to climate change until other technological alternatives are prepared, nextgeneration

coal-fi red power plants must be equipped with high-effi ciency, low-emission (HELE) technology. In the existing

HELE technology, low emission meant a reduction of pollutants such as NOx, SOx, and PM (particulate matter), but now

greenhouse gases are also a reduction target. The existing thermal power plants can supply massive low-carbon power through

fuel diversifi cation with low-carbon fuels. From this perspective, a circulating fl uidized bed (CFB) boiler represents an optimal

solution, and the importance of numerical analysis techniques is increasing in using various fuels in CFB boilers. The

particles in the CFB boiler demonstrate alterations in particle size as a consequence of cracking and abrasion resulting from

particle-wall and particle-to-particle collisions. The re-designed particle size distribution (PSD) of intrinsically induced fuel

fragmentation within a furnace diff ers from the initial fuel particle size. If the PSD change eff ect is obvious, the redefi ned

PSD should be used for a numerical simulation of a CFB boiler. In this study, we investigated the eff ect of fuel fragmentation

on the operation of a CFB boiler through 1D simulation. The fuel fragmentation factor is specifi ed as a variable with a

range of values. It has been demonstrated that the average particle size of the fuel introduced to the boiler can vary by more

than 40%, depending on the degree of fragmentation of the fuel. Consequently, alterations in the PSD impact the transfer of

heat and the temperature of the bed, which in turn aff ects combustion effi ciency. These results show that accurate estimation

of the solid size in the boiler is essential for the numerical simulation of a CFB boiler.