This study investigates the thermal degradation behavior of densified wood through thermogravimetric analysis (TGA) under an assumed real fire curve. The mass loss and mass loss rate of virgin and densified spruce powders were compared to assess the effect of densification on pyrolysis behavior. Experimental results show negligible differences between the two materials, attributed to the use of fine powders minimizing heat conduction effects. A kinetic model based on the three-step decomposition mechanism proposed by Broström (2012) was applied, focusing on hemicellulose, cellulose, and lignin as pseudo-components. Kinetic parameters were estimated using an inverse modeling approach with least squares optimization, and validated by comparing simulation results with experimental data. The model demonstrates good agreement, with activation energy values closely matching those reported in the literature. The findings confirm the suitability of the simplified three-step model and the effectiveness of the applied methodology for simulating thermal degradation of lignocellulosic biomass under realistic heating conditions.