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Abstract
Kinetic studies of CO2 gasification of different materials were carried out using the Geneva method in an apparatus for determining the reactivity of cokes. The main purpose of these studies was parallel analysis of the Boudouard–Bell (B–B) reaction progress on the basis of both solid-phase and gaseous products combined with the mass balance of the process. The kinetic equations involve the conversion degree of the solid (x) or gaseous phase (α) with the kinetic reaction rate constant. It was proved that the mathematical form of the mass balance is similar to the simplest kinetic equation, in which the kinetic constant k is replaced by the known process constant C. Complete kinetic description of the B–B reaction is determined by adopting initial conditions and taking into account the chemical reaction that occurs in a short time interval.
Highlights
Interest in the equilibrium reaction of CO2 reduction to carbon monoxide in the presence of carbon, called the Boudouard–Bell reaction, was once associated with its crucial role in the steel industry
The second observation is that the results of these studies refer to the interpretation for the second time in this work with reference to (21) with (27) or (28) in which the impact of the initial stage of the reaction/process (1) for gasification kinetics is called into question
The apparatus used for determining the reactivity of cokes according to [3] for three selected fuels: domestic coke DC, semi-coke SC and smokeless fuel SLF, in which the composition of the gaseous phase and mass loss, was analyzed using the ‘‘start–stop method.’’ It was found that the rate of the reaction/ process was related to the rate of increase in the conversion degree of the solid phase, changing in direct proportion to the conversion degree of CO2 in the gaseous phase according to (20) or (21)
Summary
Interest in the equilibrium reaction of CO2 reduction to carbon monoxide in the presence of carbon, called the Boudouard–Bell reaction (abbreviated B–B), was once associated with its crucial role in the steel industry. SainteClaire Deville had already studied this reaction in 1864 as an interesting case of dissociation. Lothian Bell (1864, 1871) investigated this reaction in blast furnace processes. Deville and Bell’s works were qualitative descriptions of the examined reactions. After 1900, Octave Boudouard published a study describing the equilibrium state of coal and carbon oxides as described in detail in [1]. The Boudouard–Bell reaction is still of significant interest due to two main reasons
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