Redko Oleksandr is Doctor of technical sciences and Professor, department of Heat, gas supply, ventilation and using WHR at the Kharkiv National University of Construction and Architecture. He defended his Dr. S thesis on the problem of intensification of heat processes in a boiling bed and is currently researching processes of low-grade fuel combustion in a boiling bed.Redko Andriy is a Doctor of technical sciences at Kharkiv National University of Construction and Architecture, and Professor in the department of Heat, gas supply, ventilation and using WHR. He defended his PhD dissertation on the problem of gypsum dehydration in a boiling bed under pressure and he is currently researching processes of heat treatment and combustion of various fuels in a boiling bed.