Attrition of high ash Ekibastuz coal in a bench scale fluidized bed rig under O2/N2 and O2/CO2 environments

Suleimenova, Botakoz; Aimbetov, Berik; Shah, Dhawal; Anthony, Edward J.; Sarbassov, Yerbol

doi:10.1016/j.fuproc.2021.106775

Cited by 7 publications

(3 citation statements)

References 38 publications

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“…The mass of the individual pellets varied in the range of 0.55 ± 0.05 g. The bituminous high ash coal from the North of Kazakhstan (Ekibastuz) was used as a supplementary fuel during co-combustion experiments and was pelletized along with SS. Details thermal and chemical properties of the Ekibastuz coal can be found elsewhere [38].…”

Section: Sample Preparationmentioning

confidence: 99%

Thermal Characterization, Kinetic Analysis and Co-Combustion of Sewage Sludge Coupled with High Ash Ekibastuz Coal

Aidabulov,

Zhakupov,

Zhunussova

et al. 2023

Energies

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Efficient utilization of natural resources and possible valorization of solid waste materials such as sewage sludge into secondary materials via thermal conversion and simultaneously recovering energy is vital for sustainable development. The continuous increase in metropolises leads to an enormous production of wet sewage sludge, which creates major environmental and technical issues. In this paper, the samples of sewage sludge from Astana’s waste water treatment plant are analyzed for their thermochemical properties, followed by thermogravimetric and kinetic analysis using the Flynn–Wall–Ozawa and Kissinger–Akahira–Sunose methods. Overall, the calorific value of sewage sludge sample was 18.87 MJ/kg and was comparable to that of the bituminous coal samples. The activation energy varied from 140 to 410 kJ/mol with changing conversion from 0.1 to 0.7. Further, mono-combustion and co-combustion experiments of the sewage sludge with high ash bituminous coal were conducted using the laboratory scale bubbling fluidized bed rig, respectively. The difference in NOx emissions between mono-combustion of sewage sludge and co-combustion with coal were at around 150 ppm, while this value for SO2 was similar in average, but fluctuates between 150 and 350 ppm. Overall, the findings of this study will be useful in developing a co-combustion technology for a sustainable disposal of municipal sewage sludge.

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Section: Sample Preparationmentioning

confidence: 99%

Thermal Characterization, Kinetic Analysis and Co-Combustion of Sewage Sludge Coupled with High Ash Ekibastuz Coal

Aidabulov,

Zhakupov,

Zhunussova

et al. 2023

Energies

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“…There have been several investigations looking into char fragmentation under oxyfuel conditions. Suleimenova et al 69 investigated particle attrition, an important phenomenon in FBC, on a bench-scale bubbling fluidized bed unit in O 2 /N 2 and O 2 /CO 2 with a similar O 2 level. The results showed that particle attrition rate was directly proportional to the superficial gas velocity, and not significantly affected by O 2 /CO 2 combustion.…”

Section: Transformation Of Mineral Mattermentioning

confidence: 99%

A Comprehensive Review of Ash Issues in Oxyfuel Combustion of Coal and Biomass: Mineral Matter Transformation, Ash Formation, and Deposition

et al. 2021

Energy Fuels

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To alleviate the global warming issue, various CO 2 abatement technologies have been proposed. As one of the leading options for CO 2 capture in power plants mostly firing coal and biomass, the oxyfuel combustion technology has been actively developed for decades. Progress at different stages of the development has been continuously updated in several reviews. However, they usually cover a wide range of topics, which vary significantly in detail. The ash issues are very critical to the design and operation of oxyfuel boilers, but may be one of the most controversial topics. The knowledge is widely scattered in different research articles, and a relatively comprehensive description is not available in the published reviews. Therefore, it is difficult for one to have a clearer picture of this important topic. The present review attempts to provide a more complete understanding. It pays particular attention to experimental data, because they are the basis for model development and full-scale simulation. Different from previous reviews that presented limited information on mineral matter transformation under oxyfuel conditions, this Review summarizes most of the related results reported in the open literature. Data on ash formation and deposition in oxyfuel combustion are also updated. They are organized according to different combustion technologies, i.e., oxyfuel pulverized fuel combustion (oxy-PFC) and oxyfuel fluidized bed combustion (oxy-FBC). By correlating between the three aspects, an in-depth understanding of ash issues in oxyfuel combustion may be achieved. At the end of this Review, key messages regarding mineral matter transformation, ash formation and deposition in oxyfuel combustion, and future research needs are presented.

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“…CWSs, being a lique ed form of coal, are generally produced by physical methods and are regarded as a viable alternative to existing fuels owing to their high solid content, convenient and low-cost hydro-transportability, and easy handling (similar to that of oil) [9]. The rheological characteristics of CWSs are similar to characteristics of heavy fuel oil making it an attractive substitute to heavy fuel oil [10,11]. The use of CWSs can overcome various inherent problems of coal, such as poor dispersibility, dust formation, and spontaneous ignition.…”

Section: Introductionmentioning

confidence: 99%

Improving the Storage Stability of Coal Water Slurries Use of a pH-Responsive Thickener

Yoon,

Tokmurzin,

Yang

et al. 2024

Korean J. Chem. Eng.

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Coal Water Slurries (CWSs) are considered to be a new form of fuel that can alleviate the environmental and safety issues associated with use of bulk solid fuel. However, CWSs does not always t into existing solid fuel supply and storage chain. In this study, we propose a novel method to control CWSs viscosity using pH responsive thickener, offering the advantages of improved storage stability and on-demand viscosity control, thus allowing CWSs to be used as a c for a variety of applications. This study investigates the effects of additives and pH on the viscosity and storage stability of CWSs. Poloxamer 407, polynaphthalene sulfonate formaldehyde (PNSF), and a copolymer containing pigment-a nic (PA) groups were used as dispersants to lower CWSs viscosity. Xanthan gum, a modi ed acrylic polymer (MAP), and carbomer were used as thickeners for assessing the storage stability and uidity of CWSs based on viscosity changes. Optimal viscosity reduction was achieved by the addition of PA. A viscosity of 7,000 cP was achieved by the use of carbomer, with small amount comparable to 27.3 wt.% of MAP and 22.7 wt.% of Xanthan gum. Moreover, the carbomer-containing CWSs exhibited high storage stability in a 360-h stability test, retaining 84.3% of the original baseline coal content. pH-dependent viscosity changes were observed only in carbomer-containing samples.

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Attrition of high ash Ekibastuz coal in a bench scale fluidized bed rig under O2/N2 and O2/CO2 environments

Cited by 7 publications

References 38 publications

Thermal Characterization, Kinetic Analysis and Co-Combustion of Sewage Sludge Coupled with High Ash Ekibastuz Coal

Thermal Characterization, Kinetic Analysis and Co-Combustion of Sewage Sludge Coupled with High Ash Ekibastuz Coal

A Comprehensive Review of Ash Issues in Oxyfuel Combustion of Coal and Biomass: Mineral Matter Transformation, Ash Formation, and Deposition

Improving the Storage Stability of Coal Water Slurries Use of a pH-Responsive Thickener

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