Thermogravimetric analysis on gasification reactivity of Hailar lignite

Hou, Ao; Wang, Ze; Song, Wenli; Lin, Weigang

doi:10.1007/s10973-011-1712-5

Cited by 16 publications

(9 citation statements)

References 32 publications

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“…1 and 4, steam decomposition and coal gasification commence from 800°C. The pyrolysis characteristics of the coals are the same when the coal is heated until 800°C either in argon or in steam ambience, which was also reported by Hou et al [25]. At temperatures below 350-400°C, different processes take place prior to primary pyrolysis, i.e., disruption of hydrogen bonds, vaporization and transport of the non-covalently bonded molecular phase [40].…”

Section: Thermal Decompositionsupporting

confidence: 54%

“…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. Fan et al [26] studied the gasification reactivity of coal chars with steam and CO 2 at medium temperature ranges using thermogravimetric analysis.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Thermal Decompositionsupporting

confidence: 54%

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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“…Study on char's reactivity is always crucial for developing novel gasification technologies as char and gasifying agents reactions are the limiting steps in controlling the gasification efficiency [2][3][4][5][6][7][8]. The investigations on char reactivity in the literature mainly employed ex-situ approaches [9,10].…”

Section: Introductionmentioning

confidence: 99%

Variations in char structure and reactivity due to the pyrolysis and in-situ gasification using Shengli brown coal

Wang

Chen

et al. 2015

Journal of Analytical and Applied Pyrolysis

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“…The presence of inherent minerals within brown coal promoted H 2 , CO 2 , and CO gas evolutions compared to the demineralized coal char and the demineralized coal char with Ca- and Na-exchanged metal species that significantly catalyzed the gasification reaction. − Fan et al found that the ash from three types of Chinese coal chars played a significant role in improving the char reactivity, which was affected by the gasification temperature and reaction degree because of the variation in the compositions and relative amounts. Hou et al claimed that the inherent minerals in Hailar lignite displayed significant catalytic effects on gasification compared to that of external ash addition. The gasification reactivity of three types of South African coals containing similar carbon structural properties (elemental, structural, and petrographical properties) was also reported to positively correlate with calcium and magnesium contents and alkali index in the ash .…”

Section: Introductionmentioning

confidence: 99%

Production of High H₂/CO Syngas by Steam Gasification of Shengli Lignite: Catalytic Effect of Inherent Minerals

Yang

Zhou

et al. 2015

Energy Fuels

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The steam gasification of Shengli lignite (SL-raw) and demineralized samples (SL-HCl and SL-HF) obtained by sequential leaching with hydrochloric acid and hydrofluoric acid aqueous solutions was conducted using fixed-bed microreactor equipment. The high steam gasification rate of Shengli lignite was achieved at a lower temperature range of 616−750°C compared to the demineralized lignite SL-HCl and SL-HF, indicating that the inherent minerals within Shengli lignite had a distinguished catalytic effect on the steam gasification. The initiating temperature for the steam gasification of SL-raw was 616°C, which was about 140°C lower compared to the initiating temperature of demineralized lignite samples SL-HCl and SL-HF at 756°C. On the basis of the very similar characteristics of steam gasification of SL-HCl and SL-HF, it was indeed confirmed that the principal component of inherent minerals that played a catalytic effect on the steam gasification reaction was calcium ion, which can be readily eluted by hydrochloric acid aqueous solution. The natural minerals within SL-raw not only effectively accelerated the reactivity of steam gasification but also significantly enhanced the H 2 production and substantially reduced the formation of CO, especially in the low-temperature range from 616 to 750°C. The optimal performances of steam gasification of Shengli lignite at lower temperatures were majorly attributed to the significant improvement of the water-gas shift (WGS) reaction by the inherent minerals. This study demonstrated that Shengli lignite could be a potential feedstock for the production of H 2 -rich synthesis gas by the steam gasification at the temperatures below 750°C.

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Thermogravimetric analysis on gasification reactivity of Hailar lignite

Cited by 16 publications

References 32 publications

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

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

Variations in char structure and reactivity due to the pyrolysis and in-situ gasification using Shengli brown coal

Production of High H₂/CO Syngas by Steam Gasification of Shengli Lignite: Catalytic Effect of Inherent Minerals

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Thermogravimetric analysis on gasification reactivity of Hailar lignite

Cited by 16 publications

References 32 publications

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

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

Variations in char structure and reactivity due to the pyrolysis and in-situ gasification using Shengli brown coal

Production of High H2/CO Syngas by Steam Gasification of Shengli Lignite: Catalytic Effect of Inherent Minerals

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Production of High H₂/CO Syngas by Steam Gasification of Shengli Lignite: Catalytic Effect of Inherent Minerals