Thermo-oxidation characteristics of oil shale and oil shale char under oxy-fuel combustion conditions

Yörük, Can Rüstü; Meriste, Tõnis; Trikkel, Andres; Kuusik, Rein

doi:10.1007/s10973-015-4484-5

Cited by 15 publications

(15 citation statements)

References 23 publications

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“…20 Although the high CO 2 partial pressure has no visible effect on the characteristic temperatures, the SO 2 emission profiles are slightly more intensive under 21%O 2 /79%Ar atmosphere. First peak is related to the oxidation of organic sulfur (≈320°C), second is the formation of iron sulfide (≈450°C) and finally oxidation of iron sulfide (≈480°C).…”

Section: Targeted Compounds In the Ms Analysismentioning

confidence: 97%

“…First peak is related to the oxidation of organic sulfur (≈320°C), second is the formation of iron sulfide (≈450°C) and finally oxidation of iron sulfide (≈480°C). 20 Although the high CO 2 partial pressure has no visible effect on the characteristic temperatures, the SO 2 emission profiles are slightly more intensive under 21%O 2 /79%Ar atmosphere.…”

Section: Targeted Compounds In the Ms Analysismentioning

confidence: 97%

“…The relationship between the conversion-dependent activation energy and reaction progress for EOS, EOS/SCE (80: 20), and EOS/PSD (80:20) in 21%O2/79%Ar and 30%O 2 /70%CO 2 is shown in Figure 5.…”

Section: Kinetic Analysis Of the Oxidation Processmentioning

confidence: 99%

“…Based on preliminary explorations, the oil content and gross calorific value of OS varies in different deposits; thus, countries that have high-quality OS reserves, such as the United States, Estonia, China, Jordan, Morocco, and Brazil, have opportunities to make feasible economic decisions. These applications can also be modernized with OF combustion technology because the results of recent studies [20][21][22] show that OF combustion can be applicable to Estonian OS (EOS) and similar type of carbonate rich fuels without having any fundamental difficulties. 18 The majority of the mined OS in Estonia is used for electricity and heat generation by direct conventional air combustion, and the remaining part is used for thermal processing (retorting) to produce shale oil.…”

Section: Introductionmentioning

confidence: 99%

“…19 In this respect, implementing modern technology by increasing the share of biomass in energy production and focusing on the use of solid wastes from OS retorting (including its residual energy potential for combustion with partial fuel switching from 100% OS to OS, biomass, and SC blends) can provide a degree of flexibility to Estonia's OS capacity. These applications can also be modernized with OF combustion technology because the results of recent studies [20][21][22] show that OF combustion can be applicable to Estonian OS (EOS) and similar type of carbonate rich fuels without having any fundamental difficulties.…”

Section: Introductionmentioning

confidence: 99%

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Thermogravimetric analysis and process simulation of oxy-fuel combustion of blended fuels including oil shale, semicoke, and biomass

et al. 2018

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Summary Oxy‐fuel (OF) combustion is considered as one of the promising carbon capture and storage technologies for reducing CO2 emissions from power plants. In the current work, the thermal behaviour of Estonian oil shale (EOS) and its semicoke (SC), pine saw dust, and their blends were studied comparatively under model air (21%O2/79%Ar) and OF (30%O2/70%CO2) conditions using thermogravimetric analysis. Mass spectrometry analysis was applied to monitor the evolved gases. The effect of SC and pine saw dust addition on different combustion stages was analysed using kinetic analysis methods. In addition, different co‐firing cases were simulated using the ASPEN PLUS V8.6 (APV86) software tool to evaluate the effects of blending EOS with different biomass fuels of low and high moisture contents. The specific boiler temperatures of each simulated case with the same adjusted thermal fuel input were calculated while applying the operation conditions of air and OF combustion. According to the experiment and process simulation results, the low heating value and high carbonate content of SC brings along endothermic decomposition of carbonates, which negatively affects the heat balance during the conventional co‐combustion of EOS with SC. Instead, firing of EOS with SC and biomass in OF process can be an effective solution to reduce the environmental impact in terms of the reduction of CO2 emissions and ash. Furthermore, the sensible heat from SC can positively affect the energy balance of the system as the endothermic effect of decomposition of CaCO3 (for both EOS and SC) can be avoided in OF combustion.

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Section: Targeted Compounds In the Ms Analysismentioning

confidence: 97%

Section: Targeted Compounds In the Ms Analysismentioning

confidence: 97%

Section: Kinetic Analysis Of the Oxidation Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermogravimetric analysis and process simulation of oxy-fuel combustion of blended fuels including oil shale, semicoke, and biomass

et al. 2018

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Oxy‐fuel co‐combustion performances and kinetics of bituminous coal and ultra‐low volatile carbon‐based fuels

et al. 2020

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Summary The co‐firing of bituminous coal under oxy‐fuel conditions is a feasible measure to improve the ignition and combustion performances of ultra‐low volatile carbon‐based fuels and effectively control pollutants. The present study aimed at the co‐combustion performances and kinetics of bituminous coal and ultra‐low volatile carbon‐based fuels under oxy‐fuel condition by means of thermogravimetric experiments. The results indicate that the volatile content in fuels is likely to affect the ignition temperature and the oxy‐fuel co‐firing of bituminous coal accelerates the ignition and advances combustion of ultra‐low volatile fuels. The combustion behaviors of individual fuel are retained in the co‐firing process to a large extent, and there is a slight synergy at the 350 to 950°C temperature range. Enhancing the oxygen concentration is effective to improve the combustion performances of ultra‐low volatile fuels in oxy‐fuel atmosphere. The apparent activation energy of residual carbon from coal‐water‐slurry gasification in oxy‐fuel atmosphere exceeds that from fluidized bed gasification, which is highly related to gasification technology and raw fuel properties. The apparent activation energy under condition of co‐firing bituminous coal and residual carbon from coal‐water‐slurry varies considerably, changed from 100 to 46 kJ/mol. Therefore, the addition of bituminous coal significantly reduces the activation energy of ultra‐low volatile fuels to improve the co‐firing performances. Based on the present investigation, a better understanding on the oxy‐fuel co‐firing of various carbon‐based solid fuels is obtained, thereby promoting the efficient and clean utilization of solid waste in the coal chemical industry.

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Study of the thermal behaviour of coal/biomass blends during oxy-fuel combustion by thermogravimetric analysis

Contreras

García-Frutos

Bahillo

2015

J Therm Anal Calorim

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Thermo-oxidation characteristics of oil shale and oil shale char under oxy-fuel combustion conditions

Cited by 15 publications

References 23 publications

Thermogravimetric analysis and process simulation of oxy-fuel combustion of blended fuels including oil shale, semicoke, and biomass

Thermogravimetric analysis and process simulation of oxy-fuel combustion of blended fuels including oil shale, semicoke, and biomass

Oxy‐fuel co‐combustion performances and kinetics of bituminous coal and ultra‐low volatile carbon‐based fuels

Study of the thermal behaviour of coal/biomass blends during oxy-fuel combustion by thermogravimetric analysis

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