Abstract
Study of oxidation kinetics for three types of coal char with different carbon content in air is presented. The coal char powders of anthracite, bituminous T-grade coal and 2B-grade lignite with particle size less than 80 μm were tested. The coal char oxidation was researched by isothermal method via simultaneous TG-DSC analyzer Netzsch STA 449 Jupiter F3 in the temperature range of 1000–1200 °C. Measurements were carried out at ambient pressure. Volumetric flow rate of oxidizing medium into analyser chamber was 250 ml/min. Flow consisted of air and argon with volumetric ratio 24/1. Carbon average rate of oxidation reaction at each temperature were defined based on experimental results. Kinetic constants (the frequency factor and activation energy) were defined for Arrhenius equation modified with three submodels: volumetric model, shrinking core model and random pore model. The activation energy values for anthracite are 1,6-1,7 times higher than for chars of bituminous coal and lignite.
Highlights
The increased attention is paid to solid fuel conversion, in particular, for bituminous coals and lignite [1]
Solid fuel gasification is realized in gasifyers with gaseous oxidizer feed there the main heterogeneous reactions takes place, mainly, carbon oxidizing by steam, carbon dioxide and oxygen resulted in hydrogen, carbon monoxide and dioxide formation [4]
The increasing of air temperature in furnace the sample combustion time values decreases while mass loss rate and carbon oxidation reaction rate increase
Summary
The increased attention is paid to solid fuel conversion, in particular, for bituminous coals and lignite [1] This data is used to improve combustion characteristics on thermal power plants and to produce syngas and hydrogen for chemical and metallurgical industry via gasification [1, 2]. Solid fuel gasification is realized in gasifyers with gaseous oxidizer feed there the main heterogeneous reactions takes place, mainly, carbon oxidizing by steam, carbon dioxide and oxygen resulted in hydrogen, carbon monoxide and dioxide formation [4]. Modern gasification technologies apply two-staged approach [5] there processes of oxidizing and reduction are takes place in different chambers of gasifyer This defines increased interest for carbon oxidation reaction kinetics:. The activation energy dependence on fixed-carbon content in fuel is presented as well
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