Thermal evolution of the oxidation characteristics of pulverized coal with different particle sizes and heating rates

Pan, Rongkun; Qiu, Tian; Chao, Jiangkun; Ma, Hongyan; Wang, Jian; Liu, Cong

doi:10.1016/j.tca.2020.178516

Cited by 30 publications

(7 citation statements)

References 25 publications

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“…At present, most scholars have carried out a lot of research on the heat release of coal combustion under conventional air combustion. Pan et al 2 studied the heat release of the oxidation characteristics of pulverized coal under conventional air combustion using a C600 microcalorimeter. The results showed that the oxidative heat evolution of pulverized coal has obvious stage characteristics of first absorbing heat and then releasing heat.…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of heat release during coal oxygen-lean combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Shi

et al. 2022

Sci Rep

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Heat release of coal combustion in an oxygen-lean and multi-gas environment is a common phenomenon, coalfield fires caused by it can lead to serious environmental destruction and loss of coal resources. Simultaneous thermal analysis experiments for Bulianta (BLT, high-volatile bituminous coal) and Yuwu coal (YW, anthracite) in 21vol.%O2/79vol.%N2 and 15vol.%O2/5vol.%CO2/80vol.%N2 were carried out to study the law of heat release. Based on the TG-DTG-DSC curves, the combustion characteristic parameters were analyzed. Decreasing O2 concentration caused a significant reduction of local reactivity and further the decreasing maximum heat release rate for low-rank coal, while increasing CO2 concentration caused a significant thermal lag effect and further the increasing maximum heat release rate for high-rank coal. The relationship between the heat release rate and the reaction rate constant was quantitatively analyzed. At the increasing stage of the heat release rate, the heat release rate of the two coals increased conforming to ExpGro1 exponential model. At the decreasing stage of the heat release rate, the heat release rate of YW coal decreased exponentially with the reaction rate constant, while the heat release rate of BLT coal decreased linearly. Regardless of the atmospheres, the conversion rates corresponding to maximum heat release rate of BLT and YW coal were about 0.80 and 0.50, respectively, indicating that the coal rank played a dominant role. The results are helpful to understand the heat release process of coal oxygen-lean combustion in O2/CO2/N2.

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Section: Introductionmentioning

confidence: 99%

Quantitative analysis of heat release during coal oxygen-lean combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Shi

et al. 2022

Sci Rep

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“…During power generation pulverized coal is transported from pulverizing mills to burners through a network of pneumatic conveying pipelines. Online measurement of the size distribution of pneumatically conveyed particles is important for smooth fuel delivery and optimized combustion processes [1,2]. On the one hand, the presence of large particles in the pipelines will cause unbalanced distribution of fuel to burners, leading to excessive NOx emission, flame oscillation, slagging, etc.…”

Section: Introductionmentioning

confidence: 99%

Online Measurement of the Size Distribution of Pneumatically Conveyed Particles Through Acoustic Emission Detection and Triboelectric Sensing

Zheng

Yan

et al. 2021

IEEE Trans. Instrum. Meas.

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“…The particle size and surface area of pulverized coal are often correlated and greatly influence the spontaneous combustion susceptibility and explosion severity of coal dust (Cashdollar, 1996;Mishra and Azam, 2018;Azam and Mishra, 2019;Pan et al, 2020). The explosibility and spontaneous combustion susceptibility or oxidation rate of coal increase with increase in the fineness and exposed surface area of coal.…”

Section: Introductionmentioning

confidence: 99%

“…The explosibility and spontaneous combustion susceptibility or oxidation rate of coal increase with increase in the fineness and exposed surface area of coal. The finer the pulverized coal particle size, the greater the exposed specific surface area available for oxygen adsorption, the stronger the coal oxidation and coal-oxygen recombination abilities, and the greater the susceptibility of coal to spontaneous combustion (Pan et al, 2020). Hence, characterization of particle size and surface area of pulverized coal is important from the spontaneous combustion susceptibility and explosion severity assessment perspectives.…”

Section: Introductionmentioning

confidence: 99%

Physico-chemical characteristics of pulverized coals and their interrelations—a spontaneous combustion and explosion perspective

Mishra

2021

Environ Sci Pollut Res

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Characteristics of pulverized coals have significant influence on the spontaneous combustion and explosion processes. This paper presents an experimental and theoretical framework on physico-chemical characteristics of coal and analyzes their interrelations from spontaneous combustion and explosion perspectives. The chemical properties, morphology, bulk density, particle size and specific surface area of pulverized coals from nine different coal subsidiaries of India are vividly investigated in five distinct sizes. Moreover, the effects of particle size on bulk density, specific surface area and N2 adsorption capacity of pulverized coals are critically analyzed. The micrographs revealed that the coal particles are mostly irregular in shape with angular outlines and sharp edges.With decrease in particle size, the bulk density of pulverized coals decreased and the specific surface area and N2 adsorption capacity increased. The relationships of bulk density and specific surface area of pulverized coals with particle size are established. Moreover, the specific surface areas determined by both the particle sizing and BET methods are compared and correlation factors between them are determined. This study led to the generation of insightful coal characteristic data which can be used as reference material for furthering researches on spontaneous combustion and explosion involving pulverized coals.

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Thermal evolution of the oxidation characteristics of pulverized coal with different particle sizes and heating rates

Cited by 30 publications

References 25 publications

Quantitative analysis of heat release during coal oxygen-lean combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Quantitative analysis of heat release during coal oxygen-lean combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

Online Measurement of the Size Distribution of Pneumatically Conveyed Particles Through Acoustic Emission Detection and Triboelectric Sensing

Physico-chemical characteristics of pulverized coals and their interrelations—a spontaneous combustion and explosion perspective

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