Abstract
The paper presents the results of studies of conversion process on the laboratory pyrolysis reactor and the results are compared with data, obtained in model experiments by thermogravimetric analysis (TGA). The heating rates were compared in the pyrolysis reactor and in the laboratory furnace of TGA in the pyrolysis process of wood biomass conversion. The laboratory pyrolysis reactor, as a part of the multistage gasification facility of low-grade solid fuel, was launched in several modes. Three experimental modes of the device operation with different screw speeds and fuel flow rates through the reaction shaft were tested. The temperature profile of fuel and wall along the length of the pyrolysis reactor was shown. The temperature up to 600 °C was recorded in a mode with a low fuel flow rate, and in the end of the reaction zone the fuel temperature was close to that of the wall. The kinetic coefficients and conversion rates for the wood biomass pyrolysis were calculated from the obtained equation. Therefore, the calculated data of the conversion rate and the pyrolysis parameters, based on the TGA data, can be used to further develop the pyrolysis reactor and evaluate the parameters of its operation.
Highlights
At present, the involvement of low-grade solid fuel in the energy balances of Russian regions becomes ever more significant
The paper presents the results of studies of conversion process on the laboratory pyrolysis reactor and the results are compared with data, obtained in model experiments by thermogravimetric analysis (TGA)
The heating rates were compared in the pyrolysis reactor and in the laboratory furnace of TGA in the pyrolysis process of wood biomass conversion
Summary
The involvement of low-grade solid fuel in the energy balances of Russian regions becomes ever more significant. The increase in solid fuel conversion efficiency is possible if the conversion is divided into several stages: thermal preparation, burning of combustible gases, and gasification of solid residue [2]. A small sample ensures minimum costs and high efficiency (homogeneity, exact correspondence of the real conversion regimes to given conditions) as well as a large number of modes and a choice of optimal conditions for research at larger facilities. When it studying the conversion process at large facilities, it is difficult to measure process parameters, there is a limited number of measurement points and irregularity of the process. Additional difficulties connected with a restrictions in researched modes because it takes a long time to reach the set operation mode but the resource of equipment is limited too
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