Pressurized CO2-enhanced gasification of coal

Chmielniak, T.; Ściążko, M.; Tomaszewicz, G.; Tomaszewicz, Martyna

doi:10.1007/s10973-014-3879-z

Cited by 21 publications

(14 citation statements)

References 24 publications

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“…Char gasification involves reactions between the fixed carbon in coal char and the gasifying agent, usually one or a mixture of oxygen, steam, and carbon dioxide. CO 2 and steam gasification of coal char are an extensively studied research topic because of its importance in power generation and chemical production [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

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Intrinsic kinetics of CO2 gasification of a Victorian coal char

Kabir

Tahmasebi

Bhattacharya

et al. 2015

J Therm Anal Calorim

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CO 2 gasification of Victorian (Morwell) brown coal char was studied using a thermogravimetric analyser (TG). Gasification kinetics of demineralised, Ca-loaded, and Fe-loaded Morwell char were also studied. The grain model and random pore model were used to fit the gasification data. The random pore model fitted the experimental data better than the grain model. The activation energy was 189.05 kJ mol -1 for the CO 2 gasification of Morwell coal char. With 2 % Ca loading, the activation energy increased to 204.53 kJ mol -1 due to lowering of the surface area. However, an order of magnitude increase in the pre-exponential factor indicated an increase in active reaction sites for the 2 % Ca-loaded sample, resulting in a net increase in gasification rate. 5 % Ca loading and 2 % Fe loading proved to be less effective in increasing the gasification rate. Analysis of the TG outlet gas also proved the effectiveness of 2 % Ca loading as a gasification catalyst.

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Section: Introductionmentioning

confidence: 99%

“…Catalytic activity of iron was studied using Fe(NO 3 ) 3 -, (NH 4 ) 3 Fe(C 2 O 4 ) 3 -, FeCl 3 -, and Fe 2 (SO4) 3 -loaded YL coal [11]. Both nitrate and oxalate salts were effective precursors.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic kinetics of CO2 gasification of a Victorian coal char

Kabir

Tahmasebi

Bhattacharya

et al. 2015

J Therm Anal Calorim

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“…The reactor has been used in the past for coal pyrolysis and gasification and recently it has been proposed to apply it to gasification with carbon dioxide [24][25][26]. The reactor encompasses a barrel like bottom part, where internal recirculation of the solid phase develops, a riser section and an expanding section at the top from which the gases are directed to the solids separator.…”

Section: Geometry and Meshmentioning

confidence: 99%

Towards a hybrid Eulerian–Lagrangian CFD modeling of coal gasification in a circulating fluidized bed reactor

Klimanek

Adamczyk

Katelbach-Woźniak

et al. 2015

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“…To improve this efficiency, a novel gasification method is being developed at the Institute for Chemical Processing of Coal (IChPW) in which additional carbon dioxide is added to the process. As indicated in the thermodynamic model, the CO 2 plays a dual role in the process as both a carbon and oxygen carrier [10]. The beneficial effect of the CO 2 addition is associated with a decrease in the demand for both carbon and oxygen while maintaining the syngas quality as in conventional air-blown systems by increasing the influence of the char-CO 2 reaction [10].…”

Section: Introductionmentioning

confidence: 99%

“…As indicated in the thermodynamic model, the CO 2 plays a dual role in the process as both a carbon and oxygen carrier [10]. The beneficial effect of the CO 2 addition is associated with a decrease in the demand for both carbon and oxygen while maintaining the syngas quality as in conventional air-blown systems by increasing the influence of the char-CO 2 reaction [10]. The process is designed to operate in a 600-kW PDU-scale pressurized circulating fluidized bed reactor rig, which is part of the Clean Coal Technologies Center of the IChPW.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on kinetics of coal char–CO2 reaction by means of pressurized thermogravimetric analysis

Tomaszewicz

Ściążko

2017

J Therm Anal Calorim

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Comprehensive kinetic studies were performed to establish the validity of many kinetic expressions that describe the behavior of char samples during pressurized gasification toward CO 2 . The gasification experiments were carried out isothermally in a high-pressure thermogravimetric analyzer (TG-HPs, TA Instruments, USA). Two char samples derived from Turów lignite B and Janina sub-bituminous C were used for the studies. The models that were employed are regarded as the most popular: the volumetric (VM); the modified volumetric (MVM); the grain (GM); the random pore (RPM); and the Langmuir-Hinshelwood model. The models were validated at 850, 950, and 1050°C, and at CO 2 pressures of 0.4, 1, 11, and 21 bar. The effects of temperature and pressure were significant and increased the reaction rate. The calculated values of activation energy were similar for the various models employed and ranged from 169 to 212 kJ mol -1 for the Turów sample and 182 to 238 kJ mol -1 for the Janina coal char sample. The GM, RPM, and MVM fit the experimental data well, in contrast to the VM and LH models.

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Pressurized CO2-enhanced gasification of coal

Cited by 21 publications

References 24 publications

Intrinsic kinetics of CO2 gasification of a Victorian coal char

Intrinsic kinetics of CO2 gasification of a Victorian coal char

Towards a hybrid Eulerian–Lagrangian CFD modeling of coal gasification in a circulating fluidized bed reactor

Experimental study on kinetics of coal char–CO2 reaction by means of pressurized thermogravimetric analysis

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