Effects of Oxygen Concentrations and Heating Rates on Non-isothermal Combustion Properties of Jet Coal in East China

Huangfu, Wenhao; You, Fei; Shao, Yiming; Wang, Zhenhua; Zhu, Yuan-shu

doi:10.1016/j.proeng.2017.12.012

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…At high heating rate, coal absorbed less oxygen and CO 2 played a leading role on the increasing v h . Increasing CO 2 concentration leaded to a thermal lag effect and further the increasing maximum heat release rate 28 . It can be seen that the influence of the O 2 /CO 2 /N 2 atmosphere on the maximum heat release rate was restricted by the coal rank.…”

Section: Resultsmentioning

confidence: 99%

“…However, for BLT coal, a decrease behavior was showed in the conversion rates ranges of 0.10–0.25 in O 2 /N 2 and 0.15–0.45 in O 2 /CO 2 /N 2 , respectively. The reason was that the precipitation of the remaining volatiles was promoted by the heat release of separated volatiles combustion, and the precipitation and combustion of volatile was significantly deferred in the O 2 /CO 2 /N 2 atmosphere compared with that in the O 2 /N 2 atmosphere 27 , 30 , 31 , because of the slightly lower diffusivity of volatiles in CO 2 than in N 2 and the lower mass flux of oxygen to the volatiles flame 28 , 32 – 34 .…”

Section: Resultsmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

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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“…With untreated biomass having a volatile matter content of 60.52%, the sample is highly likely to be more reactive and easily combustible. As seen from Table 1, biomass also possesses high oxygen concentration which leads to an increase in the self-ignition attribute of fuels and their SPONCOM liability according to Huangfu et al 29 and Ren et al 30 Furthermore, it can be also seen from Table 1 that biomass is low-quality fuel, given that it had a low calorific value of 17.28 MJ/kg. The physicochemical analysis results of the biomass that showed reduced TG spc index post treatment with ILs are presented in Table 1.…”

Section: Relationship Between the Physicochemical Properties Of Bioma...mentioning

confidence: 96%

Inhibition of Spontaneous Combustion Characteristic of Biomass Treated with Imidazolium-Based Ionic Liquids Using Thermogravimetric Analysis

Matsobane,

Bada,

Genc

et al. 2023

ACS Omega

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Emim HSO 4 , and [Bmim + OAc − ] on the SPONCOM liability of Sersia lancea biomass sample harvested from the Vaal River Mine, South Africa. The results of the derivative thermogravimetric (DTG) analysis of this indigenous biomass showed that it is highly liable to SPONCOM prior to treatment with ILs. Following treatment with all three ILs, the DTG results showed that ILs can potentially inhibit the SPONCOM liability of biomass, with [Bmim + OAc − ] showing the best inhibitory effects. With [Bmim + OAc − ] (IL-C), the TGspc index of S. lancea biomass was reduced to 0.0207 from 0.1457%/°C min −1 , and the sample was classified as low reactive after treatment. This indicates that less oxygen was consumed by the treated samples with [Bmim + OAc − ] than by the untreated ones. From the textural properties of the IL-treated biomass, the mechanism responsible for the lower liability of the treated biomass was determined. This study establishes that biomass is very reactive, and it is important to understand its liability to SPONCOM, before being shipped as a fired or co-fired fuel across the Atlantic.

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“…2 /N 2 atmosphere, because the decreasing O 2 concentration leaded to a reduction of local reactivity[28]. The values of v p for YW coal samples increased by -3.52 mW/mg, 1.43 mW/mg, and 4.25 mW/mg at 10°C/min, 15°C/min, and 20°C/min, respectively, because the lower heat conduction coe cient of CO 2 than N 2 caused a thermal lag effect[41]. It can be seen that the in uence of the O 2 /CO 2 /N 2 atmosphere on the maximum heat( ) [ ]release…”

mentioning

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

Preprint

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Coal combustion in an oxygen-lean and multi-gas environment is a common exothermic phenomenon for coalfield fires, leading 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. A delay of ignition and heat release existed during the coal oxygen-lean combustion in O2/CO2/N2. 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.

show abstract

Effects of Oxygen Concentrations and Heating Rates on Non-isothermal Combustion Properties of Jet Coal in East China

Cited by 10 publications

References 15 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

Inhibition of Spontaneous Combustion Characteristic of Biomass Treated with Imidazolium-Based Ionic Liquids Using Thermogravimetric Analysis

Quantitative Analysis of Heat Release during Coal Oxygen-Lean Combustion in a O2/CO2/N2 atmosphere by TG-DTG-DSC

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