Yalechko V. Improving the efficiency of the energy-technological process of burning crushed wood biomass

The dissertation work is devoted to the solution of the actual problem – development of scientific bases of process of burning of the crushed wood biomass and improvement of fuel devices for increase of efficiency of its burning. The conditions of application of the mathematical model of the process of thermal spontaneous combustion of wood biomass are specified in the work, which made it possible to investigate the peculiarities of this process, taking into account and without taking into account heat dissipation and to form requirements for efficient combustion of wood biomass in fuel devices. By applying the combustion reaction kinetics equation and the least squares method together, a system of equations has been developed to calculate the values of the kinetic constants of the wood combustion reaction based on the results of the nonisothermal method for investigation the combustion process. Experimental studies have been performed and the elemental composition of different wood species, including fast-growing varieties, has been determined. According to the results of thermogravimetric analysis, the kinetic constants of the combustion reaction for energy willow Salix were determined and the analytical dependences of the relative weight loss of the Salix willow sample on the inverse temperature of the sample were obtained, which makes it possible to analyze the stages of the combustion process of the sample and to form requirements for the conditions of combustion of this species of wood in fuel devices. The influence of the excess air coefficient on the fuel regime during the combustion of genetically modified wood is determined, which makes it possible to choose the optimal values of the regime parameters of the combustion process of such wood and reduce the level of emissions. According to the results of the performed researches the design of fuel devices for burning of crushed wood biomass is improved, which provides reduction of losses with mechanical and chemical afterburning and increases the efficiency of the boiler unit by 1.0–2.0%. The results of the dissertation work are implemented at the production enterprises engaged in research, design, production and operation of boiler equipment.