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Ozbas, K. E.; Kök, Mustafa Verşan; Hiçyılmaz, Cahit

doi:10.1023/a:1019911907046

Cited by 33 publications

(8 citation statements)

References 11 publications

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“…It was observed that in raw Thar lignite coal a little amount of mass loss was observed up to the temperature of 150 o C, this mass loss was due to the decomposition of light volatile matters, as observed by Kulnil (Cong et al 2019) and then shows the static behavior (no slope in TGA graph) of coal till the temperature reached 400 o C, that showed the thermal stability (Sikarwar et al 2018) (Marinov et al 2010) of Thar lignite till 380 o C. After 380 o C mass of coal was rapidly reduced, about 75% coal mass lost as the temperature was further raised about 300 o C (up to 680°C), this was owing to rapid combustion of coal between 380 o C to 680 o C, this mass loss was due to release of volatile matter and burning of coal and this demonstrate coal combustion region or primary reaction region in TGA test as reported by Kok (Ozbas, Kök, and Hicyilmaz 2002). Hence the peak combustion temperature of Thar lignite was 380 o C, after that temperature the Thar coal started to degrade.…”

Section: Optimize Reactionsupporting

confidence: 60%

Desulfurization of thar lignite by oxidative alkali leaching under pressure

Usto

Abbasi

Maitlo

et al. 2021

International Journal of Coal Preparation and Utilization

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Pakistan is the world largest lignite bearing country in the world due to the Thar coal reserves. Sulfur contained in this coal need to be removed prior to combustion. Oxidative alkali leaching in dissolved oxygen technique was used to remove the sulfur from Thar coal. This method removed enough all three types of sulfur; about 90% pyretic sulfur, 78% organic sulfur and 50% sulfate sulfur and more than 82S% of total sulfur removal was achieved. Effect of various reaction parameters were observed, it was investigated that reaction time and partial pressure of oxygen has positive effect on the desulfurization, higher the reaction time and oxygen partial pressure higher the degree of desulfurization, also the desulfurization increased with increase in reaction temperature and alkali concentration till some optimum value and then decreases with further increase in value of temperature and concentration of alkali, although desulfurization was observed maximum with minimum particle size. Coal was also characterized with Thermogravimetric Analysis (TGA) and Testo smoke number to investigate the combustion behavior of processed coal. It was observed that combustion properties of processed coal were improved and black smoke in processed coal was reduced.

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Section: Optimize Reactionsupporting

confidence: 60%

Desulfurization of thar lignite by oxidative alkali leaching under pressure

Usto

Abbasi

Maitlo

et al. 2021

International Journal of Coal Preparation and Utilization

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“…The first one is observed in the range from 35 to 150°C, with a DTG peak at 56°C that corresponds to the loss of 5.3%. This loss corresponds to the elimination of the hydrated water, small amount of pyrolysis water from decomposing phenolic groups [23]. The essential mass loss due to combustion observed in the range from 310 to 655°C, with a DTG peak at 500°C that corresponds to the loss 88.8%.…”

Section: Combustion Characteristics Of the Lignite Samplementioning

confidence: 97%

Combustion and pyrolysis characteristics of tunçblek lignite

Elbeyli

Pişkin

2006

J Therm Anal Calorim

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In this study, thermal characteristics and kinetic parameters of cleaned Tunçbilek lignite were determined by using a Setaram Labsys DTA/TG/DSC thermal analysis system both for combustion and pyrolysis reactions. Experiments were performed at a heating rate of 10°C min -1 under reactive (air) and inert (nitrogen) gases up to 1000°C. Non-isothermal heating conditions were applied and reaction intervals were determined for combustion and pyrolysis reactions from obtained curves. The combustion properties were evaluation by considering the burning profile of the lignite sample. Burning temperatures and rate of combustion were determined from TG/DTG curves. Calorific value of the lignite sample was measured by DSC curve and compared with the adiabatic bomb calorimeter result.In addition to investigation of the combustion properties, pyrolysis characteristics of the lignite sample were investigated based on TG/DTG/DSC curves. Activation energy (E) and pre-exponential factor (A) were calculated from the TG data by using a Coats-Redfern kinetic model both for combustion and pyrolysis reactions of cleaned Tunçbilek lignite.

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“…Thermogravimetric analysis has been extensively used for the reactivity characterisation of different materials, and for the study of different heterogeneous reactions involving carbonaceous samples [12,13]. Although extrapolation to other systems at larger scale cannot be directly performed, thermogravimetric analysis is very useful from a fundamental viewpoint, and for comparison between samples treated under different conditions.…”

Section: Introductionmentioning

confidence: 99%

Relationship between structure and reactivity of carbonaceous materials

Arenillas

Rubiera

Pevida

et al. 2004

Journal of Thermal Analysis and Calorimetry

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Knowledge of the amount and distribution of active sites in carbons is of paramount importance for a better understanding of the kinetics involved in heterogeneous gas-solid reactions. In this work a commercial active carbon, CM, was treated at several temperatures in order to obtain a series of samples with different textural and structural properties. The results showed that the loss of reactivity of the samples, determined by thermogravimetric analysis, is related not only to the lower surface area but also to the decrease in the amount of active sites due to a higher structural ordering.

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Untitled

Cited by 33 publications

References 11 publications

Desulfurization of thar lignite by oxidative alkali leaching under pressure

Desulfurization of thar lignite by oxidative alkali leaching under pressure

Combustion and pyrolysis characteristics of tunçblek lignite

Relationship between structure and reactivity of carbonaceous materials

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