An experimental study of operating bed pressure drop was performed in thermal treatment of coarse waste particles of different size, density, and sphericity in conical spouted beds by introducing a nonporous draft tube. The influence of introducing a nonporous draft tube as well as of operating conditions on bed pressure drop was determined. Bed pressure drop in conical spouted beds with a nonporous draft tube was found to be lower than that without any device, which allows for saving operating costs. The most important factor influencing the bed pressure drop was the stagnant bed height. The bed pressure drop was reduced when stagnant bed height, particle density, particle sphericity or inlet gas temperature were decreased. Likewise, the bigger the particle diameter, the lower was the bed pressure drop.