Coal oxidation at low temperatures: oxygen consumption, oxidation products, reaction mechanism and kinetic modelling

Wang, Haihui; Dlugogorski, Bogdan Z.; Kennedy, Eric M.

doi:10.1016/s0360-1285(03)00042-x

Cited by 580 publications

(298 citation statements)

References 81 publications

Supporting

Mentioning

287

Contrasting

Unclassified

Order By: Relevance

“…Size distribution of the particles was measured using laser particle-size-distribution tester JL-1177, and the volumetric mean diameter of the particles (D [v, 0.5]) was found to be ~1.6 μm. Fine coal particles were used to eliminate the possible reaction regime controlled by gas diffusion in coal pores during the oxidation process [2] [10]. Proximate and ultimate analyses of the coal are given in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Coal oxidation at moderate temperatures (≤400˚C) alters the coal properties as fuel, thereby making pronounced impact on its subsequent utilization [1] [2]. As an exothermic phenomenon, coal oxidation has direct link to self-heating and spontaneous combustion of coal, which poses fire hazard in coal industries.…”

Section: Introductionmentioning

confidence: 99%

“…As stated in the literature [2] [3] the rate of oxygen consumption almost doubles by every increment of 10˚C at temperatures below 90˚C. At a specific temperature, an oxygen-enriched environment may result in acceleration in the oxidation rate, thereby producing a larger amount of heat during this process.…”

Section: Introductionmentioning

confidence: 99%

“…It has been identified that two independent reaction sequences proceed during the oxidation process, and one of them is the chemisorption sequence [2] [4] [8]. Chemisorption sequence consists of several steps, including the chemisorption of oxygen, as well as formation and decomposetion of unstable carbon-oxygen complexes (intermediates).…”

Section: Introductionmentioning

confidence: 99%

“…(1) (2) Although the occurrence of the direct "burn-off" reaction at low temperatures (<150˚C) has been verified by the existing measurements and theoretical analysis [2] [4] [8] [9], the dependence of this reaction to temperature and its relationship with the chemisorption sequence have not been clearly elucidated. In addition, extensive measurements have been conducted to verify the effect of O 2 concentration on coal oxidation; however, no rigorous efforts have been made to understand the role of O 2 molecules in altering the multi-step reactions that occur during the oxidation process.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Analysis on the Governing Reactions in Coal Oxidation at Temperatures up to 400&deg;C

Zhan¹,

Wang

Zhu³

et al. 2014

IJCCE

Self Cite

View full text Add to dashboard Cite

The present study aims to further understanding of the principal reactions that occur during coal oxidation at moderate temperatures. Mass change and heat evolution of a sample were monitored by thermo-gravimetric analysis coupled with differential thermal analysis (TGA/DTA). Gaseous and solid products were traced using online or in situ Fourier transform infrared spectroscopy (FTIR). Measurements were conducted by heating the samples up to 400˚C, with the O 2 concentration in the reaction medium set at 0, 10, 21, and 40 vol%, respectively. It was observed that the mass increase of a sample between 150˚C and ~275˚C was a result of the accumulation of C=O containing species in the coal structure, whereas substantial mass loss and heat evolution of a sample at ~400˚C can be attributed to the significant involvement of the direct "burn-off" reaction. Enrichment of O 2 in the reaction medium leads to the acceleration in oxygen chemisorption, formation and decomposition of the solid oxygenated complexes, as well as the "burn-off" reaction. With the temperature increasing, the oxidation process governed by oxygen chemisorption gradually shifts to that by significant decomposition reactions, and eventually to that by the direct "burn-off" reaction. Temperature boundaries of these stages can be determined using parameters defined based on a set of TG/DTA data. Shift in the governing reactions is essentially due to the diverse requirements of reactants of the reactions and their energy barriers to be overcome. In engineering practice, the phenomena of self-heating and spontaneous combustion of coal correspond to chemisorption and the direct "burn-off" reaction, respectively.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Analysis on the Governing Reactions in Coal Oxidation at Temperatures up to 400&deg;C

Zhan¹,

Wang

Zhu³

et al. 2014

IJCCE

Self Cite

View full text Add to dashboard Cite

show abstract

Mechanochemical Effect on Maturation of Carbonaceous Material: Implications for Thermal Maturity as a Proxy for Temperature in Estimation of Coseismic Slip Parameters

Kaneki

Ichiba

Hirono

2018

Geophysical Research Letters

View full text Add to dashboard Cite

Because shear stress in a fault is directly related to the frictional heat generated during slip, the thermal maturity of carbonaceous material has been used as a proxy for fault‐rock temperature. We used infrared and Raman spectroscopic analyses and friction and heating experiments to investigate enhancement of the maturation of lignite by shear damage (the mechanochemical effect) and explored the resultant implications for the use of the thermal maturity of lignite as a proxy for temperature. We showed that higher shear stress applied to lignite samples resulted in greater progression of the thermal destruction of aliphatic C─H chains and the survival of the stronger C─C bonds. Thus, we demonstrated that shear damage during earthquake slip causes mechanochemical enhancement of organochemical reactions related to the aromatization of lignite. Our results suggest that shear stress estimated from Raman spectroscopic analyses in previous studies might have been overestimated.

show abstract

Effect of thermal damage on pore development and oxidation reaction of coal

Shao

Yang

2022

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

With the coal entering deep mining, the thermal damage to the destruction of the coal body structure, causing the phenomenon of coal spontaneous combustion is more and more common. To better understand the effect of thermal damage on coal spontaneous combustion, the law of thermal damage on pore structure and free radical of coal was studied by automatic specific surface area analyzer and electron spin resonance spectrometer. It was concluded that 225 C was a key point of thermal damage on coal spontaneous combustion.

show abstract

Coal oxidation at low temperatures: oxygen consumption, oxidation products, reaction mechanism and kinetic modelling

Cited by 580 publications

References 81 publications

Analysis on the Governing Reactions in Coal Oxidation at Temperatures up to 400&deg;C

Analysis on the Governing Reactions in Coal Oxidation at Temperatures up to 400&deg;C

Mechanochemical Effect on Maturation of Carbonaceous Material: Implications for Thermal Maturity as a Proxy for Temperature in Estimation of Coseismic Slip Parameters

Effect of thermal damage on pore development and oxidation reaction of coal

Contact Info

Product

Resources

About

Coal oxidation at low temperatures: oxygen consumption, oxidation products, reaction mechanism and kinetic modelling

Cited by 580 publications

References 81 publications

Analysis on the Governing Reactions in Coal Oxidation at Temperatures up to 400&amp;deg;C

Analysis on the Governing Reactions in Coal Oxidation at Temperatures up to 400&amp;deg;C

Mechanochemical Effect on Maturation of Carbonaceous Material: Implications for Thermal Maturity as a Proxy for Temperature in Estimation of Coseismic Slip Parameters

Effect of thermal damage on pore development and oxidation reaction of coal

Contact Info

Product

Resources

About

Analysis on the Governing Reactions in Coal Oxidation at Temperatures up to 400°C

Analysis on the Governing Reactions in Coal Oxidation at Temperatures up to 400°C