Mathematical modeling of thermal decomposition of coal

Gürüz, G.; Üçtepe, Ünalp; Durusoy, Tülay

doi:10.1016/j.jaap.2003.08.007

Cited by 34 publications

(6 citation statements)

References 25 publications

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“…The first step is referred to as pyrolysis or carbonization which may be accompanied by drastic changes in the textural and molecular structure of the coal [3][4][5][6][7][8][9]. The second is relatively slow and is usually the ratedetermining step in coal gasification [10]. Understanding the factors effecting gasification reactivities which is significantly influenced by pyrolysis conditions is essential for efficient design and operation of coal gasifiers and related equipment.…”

Section: Introductionmentioning

confidence: 99%

Physical and chemical properties of selected Turkish lignites and their pyrolysis and gasification rates determined by thermogravimetric analysis

Çakal

Yücel

Gürüz

2007

Journal of Analytical and Applied Pyrolysis

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Section: Introductionmentioning

confidence: 99%

Physical and chemical properties of selected Turkish lignites and their pyrolysis and gasification rates determined by thermogravimetric analysis

Çakal

Yücel

Gürüz

2007

Journal of Analytical and Applied Pyrolysis

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“…Many scholars have conducted researches on the release and transfer behaviors of harmful trace elements in coal combustion process. However, pyrolysis as a critical initial reaction phase of combustion (Gürüz et al 2004), the release of heavy metal elements in the process has not received sufficient attention.…”

Section: Introductionmentioning

confidence: 99%

Effect of occurrence mode of heavy metal elements in a low rank coal on volatility during pyrolysis

Zhou

Guo

Wang

et al. 2019

Int J Coal Sci Technol

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The harmful trace elements will be released during coal utilization, which can cause environment pollution and further endangering human health, especially for heavy metal elements. Compared to combustion, the release of heavy metal elements during coal pyrolysis process, as a critical initial reaction stage of combustion, has not received sufficient attention. In the present paper, a low rank coal, from Xinjiang province in China, was pyrolyzed in a fixed bed reactor from room temperature, at atmospheric pressure, with the heating rate of 10°C/min, and the final pyrolysis temperature was from 400 to 800°C with the interval of 100°C. The volatility of heavy metal elements (including As, Hg, Cd and Pb) during pyrolysis process was investigated. The results showed the volatility of all heavy metal elements increased obviously with increasing temperature, and followed the sequence as Hg [ Cd [ As [ Pb, which was mainly caused by their thermodynamic property and occurrence modes in coal. The occurrence modes of heavy metals were studied by sink-andfloat test and sequential chemical extraction procedure, and it can be found that the heavy metal elements were mainly in the organic and residual states (clay minerals) in the raw coal. And most of the organic heavy metals escaped during the pyrolysis process, the remaining elements were mainly in the residual state, and the elements in Fe-Mn state also tended to remain in the char.

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“…Previous researches have reported various models which describe the pyrolysis process of coal, and can be divided into empirical and network models based on chemical structure [4]. The primary empirical models can be classified into single reaction models (single equation models), multiple parallel reaction models (distributed activation energy models) and competing overall reactions models [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

The Simulation Study of Application of the Fg-DVC Model to the Pyrolysis of Huadian Oil Shale of China at Different Heating Rates

Wang¹,

Wang²,

Xu³

et al. 2016

Oil Shale

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In order to study the relationship between the chemical structure and pyrolysis products of oil shale, a series of experiments with Huadian oil shale of China were performed at various heating rates (10, 20 and 50 °C/min) by using Thermogravimetric Analysis-Fourier Transform Infrared Spectroscopy (TG-FTIR). The quantitative analysis of pyrolysis products, including CH 4 , CO, CO 2 , H 2 O and shale oil, was carried out. The results showed the temperature at which the evolution rate of pyrolysis products reached a peak value. Also, the evolution rate was found to increase with increasing heating rate. For the abovementioned pyrolysis products, the values of kinetic parameters such as activation energy (E) and pre-exponent factor (A) were between 183 and 270 kJ • mol-1 and from 3.3 × 10 9 to 2.8 × 10 13 s-1 , respectively. The Functional Group-Depolymerization Vaporization Crosslinking (FG-DVC) pyrolysis model based on the chemical structure of fuel was employed to simulate the evolution process of CH 4 , CO, CO 2 , H 2 O and shale oil at three different heating rates: 10, 20 and 50 °C/min. The simulation results were in good agreement with TG-FTIR experimental data, indicating the applicability of the FG-DVC model to modelling the pyrolysis process of oil shale.

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Mathematical modeling of thermal decomposition of coal

Cited by 34 publications

References 25 publications

Physical and chemical properties of selected Turkish lignites and their pyrolysis and gasification rates determined by thermogravimetric analysis

Physical and chemical properties of selected Turkish lignites and their pyrolysis and gasification rates determined by thermogravimetric analysis

Effect of occurrence mode of heavy metal elements in a low rank coal on volatility during pyrolysis

The Simulation Study of Application of the Fg-DVC Model to the Pyrolysis of Huadian Oil Shale of China at Different Heating Rates

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