Investigation of flax shive thermal destruction kinetic process

The use of waste biomass for energy purposes is currently of great interest to scientific and industrial groups around the world. Flax shive is a waste of flax processing industry, which can be used for energy purposes. The most interesting are the processes of thermal processing, making maximum use of the energy potential of the processed biomass wastes. Such methods of thermal processing include various types of pyrolysis. The paper presents the results of a kinetic study of the pyrolysis process of flax bonfire in the temperature range up to 600 °C using the experimentally obtained data of dynamic thermogravimetry. To find the kinetic parameters and the kinetic model of the process, we used model–independent methods and methods of nonlinear regression. Mathematical processing of the experimentally obtained data made it possible to determine the formal kinetic mechanism of the pyrolysis process of flax shive, the kinetic parameters and the temperature interval of each stage of the process. The obtained kinetic parameters of the pyrolysis process of the flax shive in the future will allow optimizing the industrial pyrolysis technology, to reduce the time spent on carrying out research and construction works. This kinetic model of pyrolysis process contains 4 stages of decomposition of flax shive, corresponding to the processes of moisture loss and thermal destruction of flax shive components — hemicellulose, cellulose and lignin. The significant mass of the carbonaceous residue obtained as a result of the pyrolysis of flax shive (about 29% by weight) allows us to conclude that it is potentially possible to use it further for the production of carbon-containing materials. Finally, conclusions about the applicability of flax shive as a raw material for obtaining carbon sorbents will help to make the results of further studies of strength, surface and sorption properties.
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