Study of coal pyrolysis by thermo-gravimetric analysis (TGA) and concentration measurements of the evolved species

Seo, Dong Kyun; Park, Sangshin; Kim, Yong Tack; Hwang, Jungho; Yu, Tiantang

doi:10.1016/j.jaap.2011.05.012

Cited by 96 publications

(63 citation statements)

References 29 publications

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“…The experimental results were nearly the same as those obtained in our previous work [25,26]. Figure 1 shows the derivative thermogravimetry (DTG) curves for BR = 0 and BR = 1 at a heating rate of 10°C min -1 .…”

Section: Characteristics Of Coal Pyrolysis and Biomass Pyrolysissupporting

confidence: 77%

“…At the beginning of each experiment, 0.8 g of the blended sample was loaded into a sample pan in the heating zone of the reactor. Sample masses of 0.001-2 g have previously been used in TG experiments [23,[25][26][27][28][29][30][31]. Each sample was heated to 110°C over 10 min and maintained at this temperature for 30 min until dry.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

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A comprehensive study on co-pyrolysis of bituminous coal and pine sawdust using TG

Jeong

Seo

Park

et al. 2015

J Therm Anal Calorim

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A sample consisting of woody biomass and bituminous coal was pyrolyzed in a lab-scale furnace in a nitrogen atmosphere with the temperature increasing by different heating rates of 5, 10, and 50°C min -1 until the furnace wall temperature reached 900°C. Five blending ratios (BRs) of coal-biomass were tested. For each BR, the mass loss of the sample and mole fractions of the gaseous species evolved from the sample were measured using a thermogravimetry (TG) and a real-time gas analyzer (GA). Reactivity, product yield, and activation energy were considered as index parameters to co-pyrolysis. While synergy (the difference between the experimental data and calculated results obtained using an additive model) of the reactivity of co-pyrolysis was observed only at specific temperatures, the TG results showed synergy at temperatures between 450 and 500°C compared to between 450 and 600°C seen with the GA method for all pyrolyzed gases, and especially between 350 and 650°C for H 2 . While there was no synergy in the char yield of the copyrolysis, the liquid and total gas exhibited synergy for all three BRs. The pre-exponential factors and the activation energies of BRs of 0.25, 0.5, and 0.75 were obtained using a kinetic study of co-pyrolysis.

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Section: Characteristics Of Coal Pyrolysis and Biomass Pyrolysissupporting

confidence: 77%

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

A comprehensive study on co-pyrolysis of bituminous coal and pine sawdust using TG

Jeong

Seo

Park

et al. 2015

J Therm Anal Calorim

Self Cite

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show abstract

“…The apparent reaction rate is calculated as a differential of the conversion degree versus time, denoted as dX dt . The half-life time t 0.5 indicating the time needed for 50 % conversion of carbon in chars [24] is used as a reactivity index in this work to characterize the gasification reactivity of coal chars for quantitative comparisons.…”

Section: Methodsmentioning

confidence: 99%

“…Nali et al [12] performed gas chromatography and mass spectrometry studies for the pyrolysis of various Polish and US lignites. Seo et al [24] studied coal pyrolysis using thermo-gravimetric analysis (TG) and concentration measurements of the evolved species for Chinese coals under non-isothermal conditions at various heating rates. Hou et al [25] reported the gasification reactivity of the Hailar lignite and the catalytic effects of the present ash using thermogravimetric analysis under N 2 /CO 2 ambience.…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric and evolved gas analyses of high ash Indian and Turkish coal pyrolysis and gasification

Jayaraman

Gökalp

2015

J Therm Anal Calorim

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High ash coals from India and Turkey are investigated in this study. A coupled thermogravimetric analyzer and mass spectrometer system is used for the thermal decomposition characterization of the coal samples and the identification of the volatiles evolved during the various reaction regions. Coal samples are heated in argon, air, oxygen, steam and blended gas mixtures at the temperature range from 25 to 1250°C. The experiments are performed to study the pyrolysis, combustion and gasification characteristics of typical Indian and Turkish high ash coals. Thermogravimetry and derivative thermogravimetry studies are applied to measure the conversion level and half-life time of the coals/chars during and after pyrolysis. The maximum mass loss occurs during the devolatilization stage of coals at the temperatures from 350 to 700°C, where O 2 , CO 2 , CO, H 2 and a small amount of CH 4 are released. Coal particles start to react with steam and produce CO 2 , CO and H 2 when the temperature is increased above 750°C. The gasification reactions are completed around 950°C in steam and steam blended ambience. The reactivity of high ash coal chars mainly depends on reagents' and surrounding gases concentration and also the reaction temperature. The results indicate that the size effect of the char particles is minimal at high gasification temperatures. Char gasification rates determined by TG techniques under isothermal conditions in different reagent flow rates and size effect contribute to enhance the knowledge on high ash coal thermal characterization and gasification and, therefore, to establish the optimum operational conditions for syngas production from high ash coals.

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“…The coal was also investigated in a fixed bed reactor to determine the influence that temperature and heating rate of the pyrolysis may have on the yield of the products and composition of the gases evolved. The main emission gases produced were identified as H2, CH4, C2H2, C2H4, C2H6, C3H6 and C3H8 and also minor concentrations of other gases (P. Lu et al, 2004;Seo, Park, Hwang, & Yu, 2010;Seo, Park, Kim, Hwang, & Yu, 2011).The TGA has been used to study coal characteristics for last several decades and Avila (2012) extensively used this method to propose a thermogravimetric index but failed to fully define all of the experimental parameters. The TGA experimental parameters were proposed (i.e.…”

Section: (C) Thermogravimetric Analysis (Tga)mentioning

confidence: 99%

Review of experimental methods to determine spontaneous combustion susceptibility of coal – Indian context

Mohalik

Lester

Lowndes

2016

International Journal of Mining, Reclamation and Environment

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Study of coal pyrolysis by thermo-gravimetric analysis (TGA) and concentration measurements of the evolved species

Cited by 96 publications

References 29 publications

A comprehensive study on co-pyrolysis of bituminous coal and pine sawdust using TG

A comprehensive study on co-pyrolysis of bituminous coal and pine sawdust using TG

Thermogravimetric and evolved gas analyses of high ash Indian and Turkish coal pyrolysis and gasification

Review of experimental methods to determine spontaneous combustion susceptibility of coal – Indian context

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