Effect of char generation method on steam, CO 2 and blended mixture gasification of high ash Turkish coals

Jayaraman, Kandasamy; Gökalp, I.

doi:10.1016/j.fuel.2015.01.065

Cited by 67 publications

(51 citation statements)

References 62 publications

(41 reference statements)

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“…Because of that numerous works aimed at improving gasification process are conducted. The use a variety of gasifying agents, operating conditions, types of fuel as well as catalysts are analyzed [2][3][4][5][6][7]. This research is particularly important in the case of fluidized bed reactors operating at low temperatures, where the high reactivity of the fuel is essential to ensure the efficient course of the process.…”

Section: Introductionmentioning

confidence: 99%

The influence of catalytic additives on kinetics of coal gasification process

2017

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Abstract. Catalytic coal gasification is a process that has the potential to become one of the efficient industrial technology of energy production. For this reason, the subject of this study was to analyze the kinetics of catalytic gasification of 'Janina' coal with steam. Isothermal measurements were performed at 800 °C, 900 °C, 950 °C and 1000 °C at a pressure of 1 MPa using cations of sodium, potassium and calcium as catalysts. During examination the thermovolumetric method was used. This method allows to determine the formation rates of a gaseous product such as carbon monoxide, hydrogen, methane and carbon dioxide as well as their contribution to the resulting gas. Moreover, the influence of catalysts on the kinetics of CO and H2 formation at various temperatures was determined and the kinetics parameters were calculated with the use of isoconversional model, Random Pore Model and Grain Model. The obtained results confirmed the positive effect of catalysts on the coal gasification process. The catalytic measurements were characterized by higher reaction rate and shorter duration of the process, and the calculated values of the kinetic parameters were lower than for the gasification process without the addition of catalysts.

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Section: Introductionmentioning

confidence: 99%

The influence of catalytic additives on kinetics of coal gasification process

2017

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“…Several researchers [10][11][12][13][14][15] and recently authors [16][17][18][19][20] have reported that thermal analysis techniques such as thermogravimetric analysis and mass spectrometry (TGA-MS) have been widely used to estimate the rapid quantitative methods for the examination of processes under isothermal or non-isothermal conditions and allow for the estimation of effective kinetic parameters for various decomposition reactions and evolved gas analyzes, respectively. Due to its complexity of structure and the heterogeneity of components, the determination of the coal pyrolysis process is very difficult, which consists of a lot of physical changes and chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

High ash coal pyrolysis at different heating rates to analyze its char structure, kinetics and evolved species

Jayaraman

Gökalp

Bostyn

2015

Journal of Analytical and Applied Pyrolysis

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“…To this day, a large variety of aspects were analyzed i.e. use of different operating conditions, agents and solid fuel types being the most popular [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Analysis of green liquor influence on coal steam gasification process

Karczewski

Porada

2017

E3S Web Conf.

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Abstract. Gasification is a clean and efficient technology with a long history dating up to the 19 th century. The possible application of this process ranges from gas production and chemical synthesis to the energy sector and therefore this technology holds noticeable potential for future applications. In order to advance it, a new efficient approaches for this complex process are necessary. Among possible methods, a process enhancing additives, such as alkali and alkaline earth metals seems to be a promising way of achieving such a goal, but in practice might turn to be a wasteful approach for metal economy, especially in large scale production. This paper shows alkali abundant waste material that are green liquor dregs as a viable substitute. Green liquor dregs is a waste material known for its low potential as a fuel, when used separately, due to its low organic content, but its high ash content that is also abundant in alkali and alkaline earth elements seems to make it a suitable candidate for application in coal gasification processes. The aim of this work is an evaluation of the suitability of green liquor waste to work as a potential process enhancing additive for coal steam gasification process. During the experiment, three blends of hard coal and green liquor dregs were selected, with consideration for low corrosive potential and possibly high catalytic activity. The mixtures were gasified in steam under four different temperatures. Their energies syngas yield, coal conversion degree and energies of activation were calculated with use of Random Pore Model (RPM) and Grain Model (GM) which allowed for their comparison.

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Effect of char generation method on steam, CO 2 and blended mixture gasification of high ash Turkish coals

Cited by 67 publications

References 62 publications

The influence of catalytic additives on kinetics of coal gasification process

The influence of catalytic additives on kinetics of coal gasification process

High ash coal pyrolysis at different heating rates to analyze its char structure, kinetics and evolved species

Analysis of green liquor influence on coal steam gasification process

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