Abstract
The article shows the effect of the stage of internal combustion of biomass (pine sawdust) with insufficient and excessive heat supply. Thermochemical conversion of pine sawdust was carried out first in a dynamic mode to different temperatures of 280, 320, 360, 440 and 440 ° С, and then transferred to the isothermal mode for 1 hour. As a result, the following results were obtained: 1) Hydrogen does not form when heated to 280 ° C; it is formed in small quantities at 320 ° C. From a temperature of 360 ° C and higher, the formation of hydrogen becomes significant. You can also select two modes of education, which is especially noticeable at a temperature of 440 ° C. 2) In the cases of CH4, H2O, CO and CO2, three stages of formation can be distinguished: low-temperature, medium-temperature and high-temperature. For each selected stage, the corresponding kinetic coefficients were calculated.
Highlights
The article shows the effect of the stage of internal combustion of biomass with insufficient and excessive heat supply
The condition for using thermal analysis is that after some time after the start of heating a regular mode is established in which the heating rate of the sample is equal to the heating rate of the external environment, which provides the simplest connections between the characteristics of thermoanalytical curves and various thermal and kinetic quantities
The aim of the work is to determine the mechanisms and kinetics of the formation of gaseous compounds formed during the thermochemical conversion of woody biomass
Summary
The article shows the effect of the stage of internal combustion of biomass (pine sawdust) with insufficient and excessive heat supply. With properly selected conditions for conducting thermal analysis, predominantly the kinetic mode of combustion is established, and the kinetic kinetic coefficients can be determined directly from experimental data. The main condition for such an analysis should be the technical possibility of simultaneous fixation of thermoanalytical measurements and recording of evolved gases. Compliance with this condition will allow us to correctly interpret the results [2]. Analysis of the composition of the gas mixture formed during the combustion of fuels made it possible to supplement thermoanalytical studies with information on the formation of gas products depending on external conditions, including determining the kinetics of their formation
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