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| Effect of K(g) on high temperature gasification kinetics of coke in N2-CO-CO2-H2O atmosphere |
| LAN Chen-chen1,2, ZHANG Shu-hui1,2, LIU Ran1,2, LÜ Qing1,2, LI Fu-min1,2 |
1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China;
2. Ministry of Education Key Laboratory of Modern Metallurgy Technology, North China University of Science and Technology, Tangshan 063210, Hebei, China |
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Abstract In order to understand the influence of alkali metals in high temperature zone on coke gasification process, the kinetic behaviors of coke gasification in the temperature 1 413-1 773 K were studied by thermogravimetric analysis under atmospheres of N2-CO-CO2-H2O and N2-CO-CO2-H2O-K(g). The results show that K(g) has a strong positive catalytic effect on the gasification reaction of coke, which can significantly improve the effective internal diffusion coefficient (De) and interfacial reaction rate constant (k+), reduce the activation energy of internal diffusion and interfacial reaction, and the influence of K(g) on internal diffusion is higher than that on interfacial reaction. With increase of reaction rate, the internal diffusion resistance (ηi) and interfacial reaction resistance (ηC) increase gradually, whereas K(g) tends to decrease ηi and ηC. Under the N2-CO-CO2-H2O atmosphere at 1 413 K, the controlling factor gradually changes from interfacial reaction to internal diffusion. At 1 473, 1 573, 1 673 and 1 773 K, the controlling factor is always interface reaction. Under the N2-CO-CO2-H2O-K(g) atmosphere, the controlling factor is the interface reaction.
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Received: 24 February 2022
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2022, Vol. 32 
