A Modified Random Pore Model for the Kinetics of Char Gasification

Abstract In this work, a modified random pore model was developed to study the kinetics of the carbonation reaction of CaO. Pore size distributions of the CaO pellets were measured by nitrogen adsorption and mercury porosimetry methods. The experiments were carried out in a thermogravimeter at different isothermal temperatures and CO2 partial pressures. A fractional concentration dependency function showed the best accuracy for predicting the intrinsic rate of reaction. The activation energy was determined as 11 kcal/mole between 550–700°C. The effect of product layer formation was also taken into account by using the variable product layer diffusivity. Also, the model was successfully predicted the natural lime carbonation reaction data extracted from the literature.

Download Full-text

An Adaptive Random Pore Model for Multimodal Pore Structure Evolution with Application to Char Gasification

Energy & Fuels ◽

10.1021/ef101532u ◽

2011 ◽

Vol 25 (4) ◽

pp. 1423-1437 ◽

Cited By ~ 32

Author(s):

Simcha L. Singer ◽

Ahmed F. Ghoniem

Keyword(s):

Pore Structure ◽

Structure Evolution ◽

Pore Model ◽

Char Gasification ◽

Random Pore Model

Download Full-text

Unification of Gasification Kinetics of Char in CO2at Elevated Temperatures with a Modified Random Pore Model

Energy & Fuels ◽

10.1021/ef020231m ◽

2003 ◽

Vol 17 (4) ◽

pp. 961-970 ◽

Cited By ~ 38

Author(s):

Hao Liu ◽

Chunhua Luo ◽

Masahiro Kaneko ◽

Shigeru Kato ◽

Toshinori Kojima

Keyword(s):

Elevated Temperatures ◽

Pore Model ◽

Kinetics Of ◽

Random Pore Model

Download Full-text

Study on CO 2 gasification kinetics of biomass char based on pore structure analysis: Theoretical modelling of structural parameter ψ in random pore model

International Journal of Energy Research ◽

10.1002/er.6113 ◽

2020 ◽

Author(s):

Qianshi Song ◽

Xiaohan Wang ◽

Chunhan Gu ◽

Haowen Li ◽

Jiepeng Huo

Keyword(s):

Pore Structure ◽

Structure Analysis ◽

Theoretical Modelling ◽

Structural Parameter ◽

Pore Model ◽

Biomass Char ◽

Kinetics Of ◽

Pore Structure Analysis ◽

Random Pore Model

Download Full-text

Study on Kinetics of Straw Stalk Gasification in CO2 with Random Pore Model

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.618.316 ◽

2014 ◽

Vol 618 ◽

pp. 316-320

Author(s):

Hua Fei ◽

Jin Ming Shi ◽

Yuan Lin Li ◽

Kai Luo

Keyword(s):

Experimental Data ◽

Reaction Model ◽

Carbon Conversion ◽

Pore Model ◽

Different Temperatures ◽

Shrinking Core ◽

The Relationship ◽

Kinetics Of ◽

Core Reaction ◽

Random Pore Model

The gasification of straw stalk in CO2 environment was studied by isothermal thermogravimetric analysis. The characteristics of rice straw and maize stalk gasification at different temperatures were examined under CO2 atmosphere. The relationship between reaction time and carbon conversion of two biomass chars was analyzed by the random pore model (RPM), and compared with the simulation of the shrinking core reaction model (SCRM). The results show that the random pore model is better to predict the experimental data at different temperatures. This means that the characteristics of pore structure for the influence of biomass chars gasification is well reflected by parameter ψ used in RPM. It indicates that the RPM can be applied to the comprehensive simulation of biomass chars gasification in CO2 environment.

Download Full-text

Kinetics of SO2‐Dolomite Reaction: Application of Random Pore Model

Journal of Materials in Civil Engineering ◽

10.1061/(asce)0899-1561(1994)6:1(65) ◽

1994 ◽

Vol 6 (1) ◽

pp. 65-77 ◽

Cited By ~ 6

Author(s):

Sanjeev S. Tambe ◽

Srinivas S. Yerrapragada ◽

K. L. Gauri

Keyword(s):

Pore Model ◽

Kinetics Of ◽

Random Pore Model

Download Full-text

A Modified Random Pore Model for Gasification Kinetics of Coal Char and Biomass Char

TMS 2015 144th Annual Meeting & Exhibition ◽

10.1007/978-3-319-48127-2_102 ◽

2015 ◽

pp. 841-848

Author(s):

Guang-wei Wang ◽

Jian-liang Zhang ◽

Wei-wei Geng ◽

Jiu-gang Shao

Keyword(s):

Coal Char ◽

Pore Model ◽

Biomass Char ◽

Kinetics Of ◽

Random Pore Model

Download Full-text

Structural and Gasification Kinetic Studies on Co-pyrolysis Chars of Coal and Biomass

10.21203/rs.3.rs-524028/v1 ◽

2021 ◽

Author(s):

Lang Liu ◽

Jingsong Zeng ◽

Qingrui Jiao ◽

Shan Ren ◽

Jian Yang ◽

...

Keyword(s):

Thermogravimetric Analysis ◽

Porous Structure ◽

Kinetic Studies ◽

Activation Energies ◽

Biomass Composition ◽

Pore Model ◽

Gasification Reactivity ◽

Char Gasification ◽

The Relationship ◽

Kinetics Of

Abstract In the present study, the CO2 gasification behaviours of the co-pyrolysis chars with coal and biomass as feedstock were investigated using isothermal thermogravimetric analysis (TGA) at 950–1150 °C. The TGA results demonstrated that the char gasification reactivity was improved at higher biomass composition. In addition, the char characteristics results evaluation revealed that biomass promoted the development of a porous structure and inhibited the formation of graphite-like carbon during the co-pyrolysis of coal and biomass. Moreover, an extended random pore model (eRPM) was proposed to define the char gasification kinetics of coal and biomass. It was found that the activation energies of chars decreased with increasing biomass composition. Lastly, the relationship between the gasification reactivity and char characteristics was evaluated.

Download Full-text