Investigate the kinetics of coke solution loss reaction with an alkali metal as a catalyst based on the improved genetic algorithm

Abstract

The kinetics of coke solution loss reaction with and without sodium carbonate were investigated under the reaction atmosphere of carbon dioxide. The variables of gas flow rate and coke particle size were explored to eliminate the external and internal diffusion, respectively. Then, the improved method combining with the least square and the genetic algorithm was proposed to solve the homogeneous model and the shrinking core model. It was found that the improved genetic algorithm method has good stability by studying the fitness function at each generation. In the homogeneous model, the activation energy with and without sodium carbonate was 54.89 and 95.56 kJ/mol, respectively. And, the activation energy with and without sodium carbonate in the shrinking core model was 49.83 and 92.18 kJ/mol, respectively. Therefore, it was concluded that the sodium carbonate has the catalytic action. In addition, results showed that the estimated conversions were agreed well with the experimental ones, which indicated that the calculated kinetic parameters were valid and the proposed method was successfully developed. Graphical AbstractKeywords Coking Á Kinetic Á Improved genetic algorithm Á Alkali metal Á Catalyst

Effect of the Particle Size of Iron Ore on the Pyrolysis Kinetic Behaviour of Coal-Iron Ore Briquettes

“…It was reported that the reactivity of coke can be increased by adding minerals with a catalytic effect [14,15]. At present, researchers generally believe that the minerals that can improve coke reactivity mainly include transition metals [16,17], alkali earth metals [18,19], and alkali metals [20][21][22]. However, alkali earth metal and alkali metal minerals have been studied quite thoroughly as catalysts, and these two kinds of minerals could destroy the lining of a blast furnace and aggravate the degradation of coke during the process of blast furnace production [23][24][25][26].…”

Gasification Behaviors of Ferrocoke With and Without Water Vapor

“…The reactivity of coke can be enhanced by adding alkali metals (K, Na), [10][11][12] alkaline earth metals (Ca), [13,14] and transition metals (Zn, Fe). [15,16] However, alkali metals are harmful elements in the blast furnace.…”