Mineral Composition of Estonian Oil Shale Semi-Coke Sediments

Mõtlep, Riho; Kirsimäe, Kalle; Talviste, Peeter; Puura, Erik; JÜRGENSON, J

doi:10.3176/oil.2007.3.01

Cited by 31 publications

(2 citation statements)

References 20 publications

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“…However, the structure of the semicoke is not in a completely regular arrangement like that of graphite. 85 In the heating process of oil shale, a large amount of semicoke will be produced. Semicoke produces a strong eddy current in the microwave field and has a high-temperature rise rate.…”

Section: Semicoke and Graphitementioning

confidence: 99%

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A Review on the Application of Microwave Absorbents in Oil Shale

Pan,

Lou,

Wang

et al. 2023

Ind. Eng. Chem. Res.

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The analysis of the current in situ oil shale mining technology shows that oil shale has the characteristic of poor thermal conductivity. Too solve the problems of low efficiency and high cost of traditional heat conduction mining methods, the microwave mining of oil shale has good production prospects. By microwave heating, electromagnetic energy is directly converted into heat energy by acting on medium molecules. Its transmission property makes the material inside and outside the medium simultaneously heated. No heat transfer is required. This paper summarizes the mechanism of the microwave pyrolysis of oil shale, pyrolysis parameters, and changes in the structure of oil shale in microwave pyrolysis, and how the addition of a microwave absorber endows the microwave with a better heating effect. At present, the absorbents used in microwave heating of oil shale are ferrite absorbents, nanometal absorbents, semicoke, and graphite. The research of ferrite microwave absorbents has been developing toward modification and nanocrystallization by adding trace elements. Among them, the microwave of nanoparticles leads to good absorption performance, which can help microwaves realize high-temperature conversion of oil shale. Microwaves can also be used with fracturing fluids. In the future, the structure and absorption relationship can be improved to achieve better results. Semicoke produces a strong eddy current in the microwave field and has a high-temperature rise rate. Using semicoke as a microwave absorbent can make semicoke waste into a treasure with efficient comprehensive utilization. In addition, the numerical simulation of oil shale microwave pyrolysis is also of great significance. Simulation can create reservoir conditions that experiments cannot reach. At present, it mainly simulates temperature field, decomposition, and product distribution of kerogen, and porosity and permeability evolution of oil shale. In the simulation of adding absorbent, the heating effect of adding nano-Fe3O4 absorbent is better than that of not adding absorbent, and its microwave heating range is also larger. But at present, there are few simulations for this aspect. The experimental research and numerical simulation of oil shale microwave pyrolysis absorbent need further exploration in the future.

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Section: Semicoke and Graphitementioning

confidence: 99%

“…The structure of semicoke is similar to graphite, both having the form of microcrystalline lamellar. However, the structure of the semicoke is not in a completely regular arrangement like that of graphite . In the heating process of oil shale, a large amount of semicoke will be produced.…”

Section: Application Of Microwave Absorbent For Oil Shalementioning

confidence: 99%

A Review on the Application of Microwave Absorbents in Oil Shale

Pan,

Lou,

Wang

et al. 2023

Ind. Eng. Chem. Res.

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Investigation of mineral composition of oil shale

Wang

et al. 2009

Asia-Pacific J Chem Eng

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The aim of this paper is to identify the mineral composition of oil shale from different locations and relate it to their interval of occurrence. Thermogravimetric analysis (TGA), diffuse reflectance infrared Fourier transforms spectroscopy (DRIFTS) and X-ray diffraction (XRD) methods were used for this invetigation. Hydrogen peroxide was used as the oxidant to eliminate the influence of organic matter in TGA. DRIFTS results indicated that most of the kerogen is in aliphatic hydrocarbon form and the peak of hydrocarbon nearly disappeared after oxidation. XRD results indicated that quartz, muscovite, kaolinite and calcite are the dominant minerals. Longkou and Changchun oil shale samples contain high percentage of calcite (12.9 and 11.7% CO 2 respectively) while Fushun and Huadian oil shale samples contain less than 6% CO 2 . Especially, in Fushun oil shale sample, the content is below 3%. Kaolinite is found in Fushun oil shale sample, while muscovite is only found in Huadian oil shale sample. Integration of the XRD, DRIFTS and TGA results of the oil shale samples from different locations has provided a better way of mineral composition identification. 

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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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Mineral Composition of Estonian Oil Shale Semi-Coke Sediments

Cited by 31 publications

References 20 publications

A Review on the Application of Microwave Absorbents in Oil Shale

A Review on the Application of Microwave Absorbents in Oil Shale

Investigation of mineral composition of oil shale

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

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