Effects of Coal Grade and Gasification Conditions on the Pore Characteristic Parameter of Coal Chars

Morimoto, Tatsuya; Ochiai, Tetsuya; Arakita, Kazumasa; Kametani, Tomohiko; Oda, Hirokazu

doi:10.1252/kakoronbunshu.31.56

Cited by 6 publications

(7 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the X = 0.2–0.5, it shows a maximum, which is consistent with Balci et al investigating results. Similar to the variation of pore volume of XLTL at 1000 °C, the volume of YFB and JZA increases with the conversions of char at initial stage before decreasing in the latter stages of reaction, which can be prevailingly connected with pore combination and pore enlargement of coal chars during reaction. , …”

Section: Resultsmentioning

confidence: 57%

“…Similar to the variation of pore volume of XLTL at 1000 °C, the volume of YFB and JZA increases with the conversions of char at initial stage before decreasing in the latter stages of reaction, which can be prevailingly connected with pore combination and pore enlargement of coal chars during reaction. 19,32 The SSA of coal chars may strongly influence the reactivity of char combustion in O 2 /CO 2 , but the SSA of chars are largely impacted by initial temperature of pyrolysis, coal type, and reaction temperature. The interrelation between the conversion rate and SSA of three coals is presented in Figure 1b.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Modified Discrete Random Pore Model Considering Pore Structure Evolution to Depict Coal Chars Combustion in O₂/CO₂

Fei

et al. 2017

Energy Fuels

View full text Add to dashboard Cite

The O 2 /CO 2 combustion of coal chars currently considered as one of the promising technologies has a remarkable effect on reducing greenhouse gas emissions, and it is of importance to investigate the mathematical model of pore evolution at char reaction process, while discrete random pore model (DRPM) can be usually considered as the mathematic modeling of pore evolution for effective prediction of char combustion at O 2 /CO 2 . In this work, pore structure variation of three chars during reaction at O 2 /CO 2 were presented by the N 2 isothermal adsorption/desorption method. The universally used assumption of proportional relation of superficial area and combustion rate was improved for application to coal chars, indicating true superficial area associated with the reaction rate should be corresponding to the pore superficial area 2πl(r 0 + θΔr/2). Therefore, a new pore structure model (MDRPM) was created to simulate carbon conversion of three coals combustion process in O 2 /CO 2 when chemical reaction is considered. Compared with the Liu model, the Struis model, as well as the Bhatia model (DRPM), carbon conversion calculated by the MDRPM was more consistent to experimental values for three char reaction process. According to these models, the combustion characteristic of coal chars in O 2 /CO 2 was investigated.

show abstract

Section: Resultsmentioning

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Modified Discrete Random Pore Model Considering Pore Structure Evolution to Depict Coal Chars Combustion in O₂/CO₂

Fei

et al. 2017

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…The RPM lacks of ability to predict the variation of pore characteristics studied by some researchers [15][16][17][18][19] during reaction because only stable structure parameter ψ is used. On the basis of equation (9), ψ values change with the conversion.…”

Section: B Characteristics Of Parameter ψ and Mrpm Constructedmentioning

confidence: 99%

Modified Random Pore Model Study on Coal Char Reactions under O2/CO2 Atmosphere

Fei

Xiang

et al. 2010

2010 Asia-Pacific Power and Energy Engineering Conference

View full text Add to dashboard Cite

Evolution characteristics of particle pore structure not only reflect reactive process, but also intensify the complicated degree of the reaction. Variation of pore structure in coal char particles is too complex to be described only by the invariable structure parameter ψ when the random pore model (RPM) is used to describe reaction process. In this paper, the structural parameter ψ in random pore model was modified by the pore properties and evolution characteristics of structural parameter were clarified and a new model, modified random pore model (MRPM), was developed. Compared with the simulation results of RPM, it was found that modified random pore model was more satisfied to explain the reaction processes of char, especially at the end of stage. The value of ψ changes with specific characteristic which could be explained by the pore structure feature. Using the MRPM, isotherm reactive characteristics of coal chars were analyzed at different temperatures under O 2 /CO 2 atmosphere.

show abstract

“…Combustion of fossil fuels in an Oxy-fuel environment is one of several promising new technologies for having a significant impact on reducing greenhouse emissions [2,3] . Non-catalytic gas-solid reaction, such as coal combustion as well as gasification, which is influenced by many factors (such as atmosphere, pyrolysis time, temperature), is a very complicated phenomenon, particularly to coal char [4,5] . It has an abundance of submicropores, of which the surface areas have been thought to be predominant in the char reactions [6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

“…The combustion of a porous carbon particle is a kinetic process. Coal char properties not only directly have impact on combustion and/or gasification reactions, but also intensify the complexity of the reaction [5,6,8] . Moreover, some researchers have conducted researches to study the emission of NO in Oxy-fuel combustion, and the main factors influencing NO emission have also been carefully investigated [2,3] .…”

Section: Introductionmentioning

confidence: 99%

Reactivity and Kinetic Analysis of Coal Chars Combustion under Oxy-fuel Conditions

Hua¹,

Li²,

Li³

et al. 2016

Proceedings of the 2nd Annual International Conference on Advanced Material Engineering (AME 2016)

View full text Add to dashboard Cite

Abstract. The Oxy-fuel combustion of Yunfu bituminous (YFB) chars was studied by isothermal thermogravimetric experiments at 1273K-1573K. The surface area of coal chars prepared at different stages of Oxy-fuel combustion was determined by BET methods. The pyrolysis temperature leads to a slight increase in the average pore diameter and surface area, and the average pore diameter of YFB increases with increasing carbon conversion. Pore structure parameters were calculated by random pore model. Compared to the experimental data, it is found that the random pore model has good ability to depict the reactivity of coal chars Oxy-fuel combustion under high temperature, indicating the random pore model was used to depict the reactivity of coal char combustion in Oxy-fuel.

show abstract

Effects of Coal Grade and Gasification Conditions on the Pore Characteristic Parameter of Coal Chars

Cited by 6 publications

References 9 publications

Modified Discrete Random Pore Model Considering Pore Structure Evolution to Depict Coal Chars Combustion in O₂/CO₂

Modified Discrete Random Pore Model Considering Pore Structure Evolution to Depict Coal Chars Combustion in O₂/CO₂

Modified Random Pore Model Study on Coal Char Reactions under O2/CO2 Atmosphere

Reactivity and Kinetic Analysis of Coal Chars Combustion under Oxy-fuel Conditions

Contact Info

Product

Resources

About

Effects of Coal Grade and Gasification Conditions on the Pore Characteristic Parameter of Coal Chars

Cited by 6 publications

References 9 publications

Modified Discrete Random Pore Model Considering Pore Structure Evolution to Depict Coal Chars Combustion in O2/CO2

Modified Discrete Random Pore Model Considering Pore Structure Evolution to Depict Coal Chars Combustion in O2/CO2

Modified Random Pore Model Study on Coal Char Reactions under O2/CO2 Atmosphere

Reactivity and Kinetic Analysis of Coal Chars Combustion under Oxy-fuel Conditions

Contact Info

Product

Resources

About

Modified Discrete Random Pore Model Considering Pore Structure Evolution to Depict Coal Chars Combustion in O₂/CO₂

Modified Discrete Random Pore Model Considering Pore Structure Evolution to Depict Coal Chars Combustion in O₂/CO₂