4.7 Article

Comprehensive study on the influence of preparation conditions on the physicochemical structure of char and the adaptability of the char reactivity model

Related references

Note: Only part of the references are listed.
Article Energy & Fuels

Study onCO2gasification kinetics of biomass char based on pore structure analysis: Theoretical modelling of structural parameterψin random pore model

Qianshi Song et al.

Summary: In this work, the structural function of char gasification is theoretically modelled with high accuracy and applicability for different biomass samples. The influence of sample characteristics on the structural parameter is analyzed, showing trends with varying char particle size, initial porosity, and fuel ratio. The model can predict char gasification directly through sample characteristic parameters, replacing previous methods that tested char pore characteristics.

INTERNATIONAL JOURNAL OF ENERGY RESEARCH (2021)

Article Thermodynamics

The effects of char and potassium on the fast pyrolysis behaviors of biomass in an infrared-heating condition

Haodong Zhu et al.

Summary: During the solar pyrolysis of biomass, the heat transfer is restricted, leading to the exploration of co-pyrolysis reaction behaviors of biomass and char, and secondary pyrolysis reactions of biomass. The effects of char and potassium on fast pyrolysis products distribution are discussed, showing that high temperature favors volatile release and higher heating rate promotes decomposition of bio-oils into gaseous products. Char enhances secondary pyrolysis reactions while potassium increases reactivity of biomass pyrolysis.

ENERGY (2021)

Article Engineering, Environmental

Particle-scale evaluation of the pyrolysis process of biomass material in a reactive gas-solid spouted reactor

Shiliang Yang et al.

Summary: The study on biomass pyrolysis in a spouted bed reactor reveals that the heat transfer coefficient of particles varies with bed height and shows significant distribution differences in different regions. The temperature and heat transfer coefficient of biomass increase with the rise of pyrolysis temperature, while the effect of gas velocity on the heat transfer coefficient is insignificant.

CHEMICAL ENGINEERING JOURNAL (2021)

Article Engineering, Environmental

Early-stage kinetics and char structural evolution during CO2 gasification of Morupule coal in a wire-mesh reactor

Kagiso Bikane et al.

Summary: This study investigates the gasification kinetics of Morupule coal in atmospheric pressure CO2 and the structural evolution of residual chars. The research shows that gasification reaction rates are high, with little impact on the bulk chemical structure of chars but significant changes in surface chemistry. Residual chars from gasification experiments exhibit lower combustion reactivity compared to chars produced under inert pyrolysis conditions.

CHEMICAL ENGINEERING JOURNAL (2021)

Article Engineering, Environmental

Eulerian-Lagrangian simulation study of the gas-solid reacting flow in a bubbling fluidized coal gasifier

Shiliang Yang et al.

Summary: The study demonstrates that in air-blown coal gasification, the density difference between solid species in the bed leads to spatial segregation, affecting the gasification process. Combustible gas species distribute unevenly in the bed, with little variation in gas temperature.

CHEMICAL ENGINEERING JOURNAL (2021)

Article Energy & Fuels

Deactivation mechanism of coal char gasification reactivity induced by cow manure biomass volatile-coal char interactions

Meng Ma et al.

Summary: Volatile-char interactions affect the chemical structure and reactivity of coal char, with O-containing functional groups playing an important role in char reactivity. The decrease in gasification reactivity due to volatile-char interactions is attributed to the decrease in aromatic C-O and C=O, and the increase in graphite carbon structures.
Article Energy & Fuels

Combined impacts of intrinsic alkali and alkaline earth metals and chemical structure on reactivity of low-rank coal char: New explanation for the role of water-soluble AAEMs during pyrolysis and gasification

Yan Zhao et al.

Summary: This study investigates the influence of intrinsic alkali and alkaline earth metals (AAEMs) and organic matter chemical structure on char reactivity, providing evidence for the controversial role of water-soluble AAEMs during char gasification. Results show that water-soluble AAEMs decrease char reactivity in the early gasification stage due to catalytic cracking of aromatic C-H bonds, while increasing it later due to original catalysis; ion-exchangeable AAEMs catalyze the opening of aromatic rings in char, particularly small rings, weakening the reaction priority of aliphatic structures. Increasing pyrolysis temperature results in ordered chemical structure and enrichment of ion-exchangeable AAEMs, affecting char reactivity differently at different temperature ranges.
Article Energy & Fuels

Calcium catalytic behavior during in-situ gasification of different aged coal chars in CO2 and steam

Fangqi Liu et al.

Summary: The catalytic behavior of exchangeable calcium in coals during pyrolysis and gasification processes was studied. The experiment showed that char aging significantly changes the state and dispersion of calcium, but does not affect its catalytic action. Increasing temperature enhances gasification reactivity, while the decrease in calcium dispersion may offset the increase in catalytic activity.
Article Chemistry, Analytical

Pyrolysis characteristics of metal ion-exchanged Shendong coal and its char gasification performance

Qiuxiang Yao et al.

Summary: The study investigates the effects of ion-exchanged metal cations on the pyrolysis reactivity of coal and gasification performance of pyrolysis chars. Results show that ion exchange of Co2+ and Ni2+ increase coal tar yields, while alkali and alkaline earth metal cations promote the formation of naphthalene in coal tar. The catalytic effect of these metal cations on coal pyrolysis is in the order Na+ > K+ > Ni2+ > Ca2+ > Mg2+ > Co2+.

JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS (2021)

Article Thermodynamics

Reaction process and characteristics for coal char gasification under changed CO2/H2O atmosphere in various reaction stages

Zihang Zhang et al.

Summary: During the operation of industrial gasifier, the concentrations of CO2 and H2O in gasification media vary with the change of stages, affecting the gasification process. Increasing H2O concentration can improve the reaction rate and conversion rate of coal char, especially in the early stage. The shrinking core model fits the gasification process of coal char better in a highly reactive 95% H2O/5% N-2 atmosphere.

ENERGY (2021)

Article Environmental Sciences

Thermal degradation characteristics and gasification kinetics of camel manure using thermogravimetric analysis

Prakash Parthasarathy et al.

Summary: This work studied the sustainable valorisation of camel manure using thermogravimetric analysis and different kinetic models were applied to estimate the kinetics of O2 gasification. The Coats-Redfern method and Flynn-Wall-Ozawa model were found to be the best fitting models for the experimental data.

JOURNAL OF ENVIRONMENTAL MANAGEMENT (2021)

Article Thermodynamics

CFD simulation of air-blown coal gasification in a fluidized bed reactor with continuous feedstock

Shiliang Yang et al.

ENERGY CONVERSION AND MANAGEMENT (2020)

Article Agricultural Engineering

Theoretical modelling of the chemical reactivity of fresh under non-catalytic conditions

Xiaohan Wang et al.

BIORESOURCE TECHNOLOGY (2019)

Article Engineering, Environmental

Exploration and practice to improve the kinetic analysis of char-CO2 gasification via thermogravimetric analysis

Yan Zhang et al.

CHEMICAL ENGINEERING JOURNAL (2019)

Article Engineering, Environmental

Intrinsic gasification kinetics of coal chars generated in a high-pressure, high-temperature flow reactor

Vijayaragavan Krishnamoorthy et al.

CHEMICAL ENGINEERING JOURNAL (2019)

Article Thermodynamics

DFT study of the catalytic effect of Na on the gasification of carbon-CO2

Deng Zhao et al.

COMBUSTION AND FLAME (2018)

Article Chemistry, Applied

Changes of biochar physiochemical structures during tar H2O and CO2 heterogeneous reforming with biochar

Dongdong Feng et al.

FUEL PROCESSING TECHNOLOGY (2017)

Article Thermodynamics

Ignition and combustion characteristics of single particles of Zhundong lignite: Effect of water and acid washing

Zhezi Zhang et al.

PROCEEDINGS OF THE COMBUSTION INSTITUTE (2017)

Article Chemistry, Multidisciplinary

CO2 gasification of woody biomass chars: The influence of K and Si on char reactivity

Zeineb Bouraoui et al.

COMPTES RENDUS CHIMIE (2016)

Article Engineering, Chemical

Migration of Alkali and Alkaline Earth Metallic Species and Structure Analysis of Sawdust Pyrolysis Biochar

Yijun Zhao et al.

KOREAN CHEMICAL ENGINEERING RESEARCH (2016)

Article Chemistry, Analytical

Variations in char structure and reactivity due to the pyrolysis and in-situ gasification using Shengli brown coal

Xiu-qiang Xu et al.

JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS (2015)

Article Engineering, Environmental

Mechanism analysis and experimental verification of pore diffusion on coke and coal char gasification with CO2

Wei Huo et al.

CHEMICAL ENGINEERING JOURNAL (2014)

Article Agricultural Engineering

Kinetic modelling of steam gasification of various woody biomass chars: Influence of inorganic elements

Capucine Dupont et al.

BIORESOURCE TECHNOLOGY (2011)

Article Engineering, Chemical

SCT reaction kinetics model and diffusion for p.c. combustion in TGA

Pei-Fang Fu et al.

ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING (2010)

Article Biotechnology & Applied Microbiology

Effects of metal catalysts on CO2 gasification reactivity of biomass char

Yanqin Huang et al.

BIOTECHNOLOGY ADVANCES (2009)

Article Energy & Fuels

Study about the kinetic processes of biomass steam gasification

Capucine Dupont et al.

Article Materials Science, Multidisciplinary

Van der Waals radii of elements

SS Batsanov

INORGANIC MATERIALS (2001)