Oxyfuel technology: Oil shale desulphurisation behaviour during unstaged combustion

Al-Makhadmeh, Leema A.; Maier, J.; Batiha, Mohammad A.; Scheffknecht, Günter

doi:10.1016/j.fuel.2015.05.059

Cited by 11 publications

(5 citation statements)

References 35 publications

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“…Earlier research has already investigated many aspects of oxyfuel combustion with oil shale. − Thermogravimetric analysis experiment has also been performed to better understand the kinetics of oil shale combustion in the CO 2 -rich oxyfuel atmosphere . Small laboratory reactor experiments have also been performed, − and in some of these experiments, it was observed that oxyfuel combustion reduces the amount of free lime in the ash . Yörük et al have also used a process simulator to model an oxyfuel combustion process with oil shale.…”

Section: Introductionmentioning

confidence: 99%

Mineral and Heavy Metal Composition of Oil Shale Ash from Oxyfuel Combustion

et al. 2020

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Oxyfuel combustion can reduce CO 2 emissions from fossil fuels. Hence, it is currently being investigated for potential use in oil shale-fired power plants, which currently produce most of Estonia’s electricity. Here, experiments were performed with kukersite oil shale for both oxyfuel and conventional combustion in a 60 kW th circulating fluidized bed combustor. In this paper, we provide data on the ash composition including mineral compositions and heavy metal concentrations. Oxyfuel conditions did not noticeably influence the concentrations of heavy metals in the ash but did have significantly lower amounts of free lime because of inhibition of the carbonate decomposition reactions. The results suggest that oxyfuel combustion would produce no significant problems in terms of the behavior of the ash or the fate of heavy metals contained in the ash.

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Section: Introductionmentioning

confidence: 99%

Mineral and Heavy Metal Composition of Oil Shale Ash from Oxyfuel Combustion

et al. 2020

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“…Also, the oxygen concentration in the O 2 /CO 2 oxidizer was reported to significantly affect the production and consumption rates of CO in oxyfuel combustion products. , A higher CO 2 concentration in the oxidizer was reported to achieve in-combustor desulfurization. This fact can be exploited in oxyfuel combustion of oil shale having high sulfur contents . Other oxyfuel combustion literature include numerical work by Krieger et al, gas turbine application of oxyfuel combustion by Liu et al., and the thermodynamic cycle analysis for oxyfuel combustion conducted by Hammer et al It is remarkable, however, that most of the available literature on oxyfuel combustion focuses on coal, apparently, because of its comparatively higher carbon content, making its combustion CO 2 rich, and because of the potential of coal in integrated gasification combined cycle (IGCC) plants.…”

Section: Introductionmentioning

confidence: 99%

“…This fact can be exploited in oxyfuel combustion of oil shale having high sulfur contents. 18 Other oxyfuel combustion literature include numerical work by Krieger et al, 19 gas turbine application of oxyfuel combustion by Liu et al, 20 and the thermodynamic cycle analysis for oxyfuel combustion conducted by Hammer et al 21 It is remarkable, however, that most of the available literature on oxyfuel combustion focuses on coal, apparently, because of its comparatively higher carbon content, making its combustion Energy & Fuels CO 2 rich, and because of the potential of coal in integrated gasification combined cycle (IGCC) plants. This includes a comprehensive review on the state-of-the-art oxy-fuel combustion fundamentals, their modeling, and model implementation 22 and other studies dealing with oxyfuel combustion of coal.…”

mentioning

confidence: 99%

Experimental Analysis of the Stability and Combustion Characteristics of Propane–Oxyfuel and Propane–Air Flames in a Non-premixed, Swirl-Stabilized Combustor

2018

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Carbon dioxide (CO2) emission forms the biggest portion of greenhouse gas emissions known to cause global warming, which can lead to climate change. One of the most widely recommended means of tackling CO2 emission is the carbon capture technique, which includes oxyfuel combustion. In oxyfuel combustion, O2/CO2 oxidizer mixtures are used to lower the oxy-combustion temperatures to make it suitable for the components of the combustion systems. These oxidizer mixtures, depending upon the relative concentrations of the species, exhibit distinct combustion characteristics. In this study, flame stability of propane–air and propane–oxyfuel combustion is studied in a non-premixed, swirl-stabilized combustor. The combustion of air was compared to two oxyfuel mixtures, namely, oxyfuel I and II, in terms of lean blowout limits. Oxyfuel II and air combustion were also compared in terms of the temperature. Furthermore, the effects of the CO2 dilution level, equivalence ratio, swirl number, and combustor firing rate on oxyfuel flame stability were studied. Results show that, for lean mixtures, the propane–air flame transits from the attached flame to lifted flame before subsequent flame extinction. This is contrary to oxyfuel I and II flames that transit directly from the attached flame to no flame regime at all firing rates studied. Near stoichiometry, however, the oxyfuel flames display distinct flame transitions, including liftup before extinction as a consequence of CO2 dilution at high firing rates. These flame transitions before blowout were observed to be flow-induced. NO x and CO emissions were seen to depend strongly upon air and oxyfuel combustion temperatures. The amount of CO2 required in the oxidizer at blowout was observed to decrease significantly as the equivalence ratio decreases from 1 to 0.9, signifying an enhanced stability at stoichiometric conditions. Further studies revealed that the oxyfuel flames are more stable at the swirl number of 1.0 when compared to 0.6 and 1.5.

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“…One of the most effective ways for oil shale utilization would be direct combustion, and those of a gross calorific value higher than 3 MJ/kg can be utilized with pulverized firing (PF) and circulating fluidized bed combustion (CFBC) technologies for power generation . Recently, several studies have been made to employ the oxy‐fuel combustion of oil shale as a promising technology of carbon capture and sequestration (CCS) since its large amount of carbonate minerals can cause a high specific emission of carbon dioxide . Despite the research efforts, combustion of oil shale using the existing processes, which were initially designed for coal combustion, has been accompanied by a number of operating problems due to very specific and complicated compositions of organic and mineral matters in oil shale which vary significantly in different basins .…”

Section: Introductionmentioning

confidence: 99%

“…[3] Recently, several studies have been made to employ the oxy-fuel combustion of oil shale as a promising technology of carbon capture and sequestration (CCS) since its large amount of carbonate minerals can cause a high specific emission of carbon dioxide. [4,5] Despite the research efforts, combustion of oil shale using the existing processes, which were initially designed for coal combustion, has been accompanied by a number of operating problems due to very specific and complicated compositions of organic and mineral matters in oil shale which vary significantly in different basins. [6] Furthermore, the oil shale deposit consists of several layers which are in turn subdivided in sub-layers, and therefore variations in such chemical properties of oil shale also depend to a great extent on mining conditions despite the same batch.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis and char oxidation characteristics of oil shales and coal in a thermogravimetric analyzer

Park

Song

2017

Can J Chem Eng

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Non‐isothermal thermogravimetric analysis was carried out on two different oil shales and sub‐bituminous coal in order to evaluate effects of the fuel properties and compare the reaction characteristics. The samples and their chars after the devolatilization were heated up to 900 °C at a constant heating rate of 10 K/min under inert and oxidizing atmospheres, respectively. Experimental results exhibit distinct behaviour between the samples for both pyrolysis and char oxidation processes. Pyrolysis of oil shale occurs in two temperature regimes corresponding to its organic and mineral degradation, and mineral matter plays important roles in production of the residual char at the second pyrolysis stage and its reactivity to the subsequent char oxidation. Kinetic analysis was performed using the global one‐ and multi‐step models with nth order reaction mechanism. Organic devolatilization processes of coal and oil shale are analyzed by three‐ and two‐step models, respectively, however mineral degradation of oil shale and char oxidation are analyzed by a one‐step model. Finally, a reasonable fit to the experimental data can be achieved for all the samples and their chars at different atmospheres.

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Oxyfuel technology: Oil shale desulphurisation behaviour during unstaged combustion

Cited by 11 publications

References 35 publications

Mineral and Heavy Metal Composition of Oil Shale Ash from Oxyfuel Combustion

Mineral and Heavy Metal Composition of Oil Shale Ash from Oxyfuel Combustion

Experimental Analysis of the Stability and Combustion Characteristics of Propane–Oxyfuel and Propane–Air Flames in a Non-premixed, Swirl-Stabilized Combustor

Pyrolysis and char oxidation characteristics of oil shales and coal in a thermogravimetric analyzer

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