This paper explores the potential of hydrogen as fuel through a detailed computational simulation of a DJ2700 gun. The simulation conditions, namely, boundary conditions, were established from experimental data collected from the literature. A one-step chemical reaction model and the eddy dissipation model were used to calculate the flame dynamics numerically. A decoupling method was used to calculate the dynamic behavior of the particle. The effects of the hydrogen, oxygen, and oxyfuel flow on the gas and WC-Co-Cr particles were evaluated. The results revealed that the hydrogen flow has a dominant impact on the temperature and velocity of the gases and, consequently, on the particle's temperature and velocity. On the other hand, the oxygen flow has a dominant effect on the pressure achieved inside the combustion chamber. In addition, it was observed that the particle velocity is proportional to the pressure, while the particle temperature is affected by both fuel and oxygen flow.