Records with Keyword: Coal
Showing records 1 to 25 of 92. [First] Page: 1 2 3 4 Last
Research on Oxy-Fuel Combustion Characteristics of Two Typical Chinese Coals
Minghao Wang, Zhenzhou Pang, Guohua Wei, Jingjie Wang, Guangmeng Wang, Geng Jia, Lingbu Zhang, Jingyu Guan
August 2, 2023 (v1)
Subject: Other
Keywords: burnout, Coal, ignition, NOx, oxy–fuel combustion
Oxy−fuel (O2/CO2) combustion technology shows great potential for carbon reduction. However, difference in the combustion atmosphere would affect coal combustion characteristics and pollutant emissions. In order to explore oxy−fuel combustion characteristics, two typical Chinese coals, sub−bituminous and lean coal, were utilized. Based on thermogravimetry and pilot−scale test, the ignition and burnout characteristics under oxy−fuel and air combustion atmosphere were investigated. Besides, the NOx emission characteristics were also investigated on the pilot−scale test. Through experimental results, these two kinds of coal showed different combustion characteristics, mainly due to differences in coal quality. Compared with air combustion, oxy−fuel combustion affected the coal combustion process. Firstly, the ignition temperature of sub−bituminous and lean coal decreased from 418 and 477 °C to 405 and 415 °C, respectively; the burnout temperature also decreased from 855 and 985 °C to 808... [more]
A Study of the Effect of Freeze−Thawing by Liquid Nitrogen on the Mechanical and Seepage Characteristics of Coal with Different Moisture Content Values
Xiaohan Qi, Shuangrong Hou, Heng Ma, Pin Wang, Yang Liu, Xiaoqi Wang
July 13, 2023 (v1)
Subject: Materials
Keywords: Coal, coal seams, deep low permeability, gas permeation, mechanical, seepage, water content
In order to study the effect of freezing and thawing of liquid nitrogen on the mechanical and seepage characteristics of coal rock with different water content values, conventional triaxial loading tests on freeze−thawed coal samples with different water content values were carried out using non-contact digital image processing technology. The research results showed that with the same water content, the peak strength of a liquid nitrogen freeze−thawed coal sample was smaller than that of a non-freeze−thawed coal sample, and the Poisson’s ratio was larger than that of the non-freeze−thawed coal sample; compared with the non-freeze−thawed coal sample, the strain fluctuation and concentration in the stages of compression density, elasticity, yield, and damage were weakened after freeze−thawing by liquid nitrogen, but the local stress concentration was more obvious; the non-freeze−thawed coal sample mainly showed single shear damage, and the damage fissures were inclined fissures with sma... [more]
Research on Pore-Fracture Characteristics and Adsorption Performance of Main Coal Seams in Lvjiatuo Coal Mine
Wu Li, Jin Li, Changqing Hu, Qianlong Xiao
July 7, 2023 (v1)
Subject: Materials
Keywords: Coal, coal reservoir, CT, pore
Gas prevention and control have always been the focus of coal mine safety. The pore structure characteristics and gas adsorption characteristics of coal seams are the key factors affecting gas adsorption and diffusion in coal seams. Lvjiatuo Mine has the characteristics of a high gas content when it enters deep mining. In order to clarify the influence of the pore-fracture structure characteristics of main coal seams in the research area on coal seam gas adsorption and diffusion, and to study the differences in gas adsorption and diffusion ability in different coal seams, low-temperature nitrogen adsorption (LT-N2GA), high-pressure mercury intrusion (MIP) and computerized tomography (μ-CT) were used as characterization methods, and methane isothermal adsorption experiments were carried out to systematically study the pore structure characteristics of five groups of coal samples, and the pore-fracture structure characteristics and gas adsorption characteristics of each main coal seam we... [more]
The Combustion of Forest Humus Blended with Low-Rank Coal: Effects of Oxygen Ratio and Blending Ratio
Guoli Zhou, Tong Zhang, Chenfei Lou, Kunpeng Wang, Qinghang Yun, Peng Li, Xiaoyang Qu, Guosheng Li
July 4, 2023 (v1)
Keywords: co-combustion, Coal, humus, kinetics, synergistic effect
In this study, the combustion characteristics of pine needles, pine needle humus, and the co-combustion of these two types of biomass with coal were compared. In addition, the optimization of the combustion performance of coal/humus was assisted through the following studies: (i) the combustion performance of coal/pine needle humus was studied under four different oxygen concentrations (N2, 10%O2/90%N2, 20%O2/80%N2, and 40%O2/60%N2); (ii) the synergistic effect between the humus and coal during combustion was also investigated by adjusting the blending ratio and oxygen content; (iii) the mechanisms of the optimized combustion processes were expounded by kinetics and thermodynamics discussion. The results demonstrated that the combustion characteristics of the coal/humus blends were found to be higher than those of the coal/pine needle blends. The coupling interactions of the oxygen content and blending ratio contributed to the significant synergistic effect between the two fuels, and t... [more]
Model for Predicting CO2 Adsorption in Coal Left in Goaf Based on Backpropagation Neural Network
Fei Gao, Peng Wang, Dapeng Wang, Yulong Yang, Xun Zhang, Gang Bai
May 23, 2023 (v1)
Keywords: CO2 sequestration, Coal, influence factors, Machine Learning, pore structure
Injecting power plant flue gas into a goaf stores CO2 in the flue gas and effectively prevents the spontaneous combustion of the coal remaining in the goaf. Here, we investigated the adsorption behavior of three types of coal at normal temperature and pressure using a self-developed adsorption experimental device. We used a specific surface area and porosity analyzer to study the effects of pore structure, mineral content, and moisture content on CO2 adsorption in coal. Based on the experimental data, we designed a multifactor CO2 adsorption prediction model based on a backpropagation (BP) neural network. The results indicated that the pore size of most micropores in coal was in the range of 0.5−0.7 and 0.8−0.9 nm. The specific surface area and pore volume were positively correlated with the CO2-saturated adsorption capacity, whereas the mean pore diameter, mineral content, and moisture content were inversely associated with the CO2-saturated adsorption amount. The accuracy of the mult... [more]
The Concept of Optimal Compaction of the Charge in the Gravitation System Using the Grains Triangle for Cokemaking Process
Andrzej Mianowski, Bartosz Mertas, Marek Ściążko
April 21, 2023 (v1)
Keywords: bulk density, Coal, coefficient of susceptibility, coke quality, grains triangle, porosity
Two isomorphic sets of grains, small and large, were analysed—without specifying their dimensions—under the acronym CMC (Curve of Maximum Compression) and taking into account the effects of segregation CMCS. The proposal is particularly valuable for optimal blend preparation in the gravity system in cokemaking. The main advantage of this work is the proposal of using the grains triangle, which limits the values calculated by the relations: bulk density-share of coarse/fine grains, for different levels of moisture content. Each system of changing shares of coarse grains is characterised by a constant C, but there is no need to determine it. Compliance of the calculated value with the experimentally determined value means that the given arbitrary grain set has reached its maximum density called the “locus”. The grains triangle practically covers the vast majority of laboratory and industrial test results, and geometrically or computationally indicates the ability of a given particle size... [more]
Emission Mitigation and Energy Security Trade-Off: Role of Natural Gas in the Indian Power Sector
Nandini Das, Shyamasree Dasgupta, Joyashree Roy, Oluf Langhelle, Mohsen Assadi
April 21, 2023 (v1)
Subject: Energy Policy
Keywords: Coal, energy security, energy transition, India, Natural Gas, Renewable and Sustainable Energy
India’s Nationally Determined Contributions (NDC) aim to increase the share of non-fossil fuel, especially renewables, in power generation. But at the same time, it mentions that coal is likely to dominate the power generation in the short and medium term to meet the increase in demand and support the intermittency of renewable energy-based power generation. Thus, additional efforts to transform the thermal power generation to a more efficient and less emitting one in the near term by increasing the use of natural gas (a fossil fuel with a lower emission factor than coal) may be planned towards achieving India’s additional mitigation commitments. The paper presents the implications of a proposed increase in the share of natural gas in thermal power generation of India by looking into the trade-off between emission mitigation and energy security. Along with a Reference Scenario, three alternative emission scenarios are proposed to understand the likely impacts of increased penetration o... [more]
Just Transition as a Tool for Preventing Energy Poverty among Women in Mining Areas—A Case Study of the Silesia Region, Poland
Olga Janikowska, Joanna Kulczycka
April 20, 2023 (v1)
Subject: Energy Policy
Keywords: Coal, employment, energy poverty, gender, just transition, sustainable development goal, women
The inevitable energy transformation can be perceived as an opportunity and as a threat to the actions undertaken to prevent energy poverty in European mining regions. Silesia is a special exemplification of the European region whose economy has been based on coal industry for centuries. There are still about 70,000 miners and coal is also widely used for heating households. Based on developed map of jobs lost in mining and related industry and the demographic and social data the proposal of activities addressed to different group of people has been created. It was also indicated that energy poverty in Poland mainly concerns households inhabited by single women. Therefore, the major conclusion of the paper is postulated that the Just Transition strategy should be extended by issues strictly related to the situation of women in the future labor market. Additionally, the concept of a special hub for women, whose aim would be professional activation of women of various age groups, has bee... [more]
A Preliminary Study on Dependence of Mercury Distribution on the Degree of Coalification in Ningwu Coalfield, Shanxi, China
Yinjiao Su, Xuan Liu, Yang Teng, Kai Zhang
April 20, 2023 (v1)
Keywords: ash, Coal, coalification, correlation, Hg, speciation, sulfur
Mercury (Hg) is a toxic trace element emitted from coal conversion and utilization. Samples with different coal ranks and gangue from Ningwu Coalfield are selected and investigated in this study. For understanding dependence of mercury distribution characteristics on coalification degree, Pearson regression analysis coupled with Spearman rank correlation is employed to explore the relationship between mercury and sulfur, mercury and ash in coal, and sequential chemical extraction method is adopted to recognize the Hg speciation in the samples of coal and gangue. The measured results show that Hg is positively related to total sulfur content in coal and the affinity of Hg to different sulfur forms varies with the coalification degree. Organic sulfur has the biggest impact on Hg in peat, which becomes weak with increasing the coalification degree from lignite to bituminous coal. Sulfate sulfur is only related to Hg in peat or lignite as little content in coal. However, the Pearson linear... [more]
Thermogravimetric Analysis of Solid Biofuels with Additive under Air Atmosphere
Joanna Wnorowska, Szymon Ciukaj, Sylwester Kalisz
April 19, 2023 (v1)
Keywords: Biomass, Coal, combustion, fuel additives, non-isothermal model methods
The paper presents the combustion profile of selected fuels as a result of thermogravimetric analysis. The main purpose of this study was to investigate a mixture of different types of fuel and the influence of the use of a fuel additive on the combustion process profile. As a fuel additive, halloysite was used to investigate the thermogravimetric profiles. It was confirmed that the main combustion parameters such as ignition temperature, burnout temperature, and maximum peak temperature correlated accordingly with different combustibility indices such as the ignition index, the burnout index, and the combustion indices. Furthermore, the present study provided a comparison of selected methods for analyzing non-isothermal solid-state kinetic data and investigated the kinetics of thermal decomposition to describe the ongoing process. Two non-isothermal model methods (Kissinger and Ozawa) were used to calculate the Arrhenius parameters. The effect of heating rate and the addition of hallo... [more]
EU: The Effect of Energy Factors on Economic Growth
Ayaz Aliev, Madina Magomadova, Anna Budkina, Mustafa Harputlu, Alagez Yusifova
April 18, 2023 (v1)
Keywords: Coal, econometrics, economic growth, European Union, fixed effect, gretl software, gross domestic product, oil, ordinary least squares, Renewable and Sustainable Energy, selection effect
In this article, we investigate the effect of different energy variables on economic growth of several oil-importing EU member states. Three periods from 2000 to 2020 were investigated. Three different types of regression models were constructed via the gretl software. Namely, the OLS, FE, and SE approaches to panel data analysis were investigated. The FE approach was chosen as the final one. The results suggest the importance of the consumption of both oil and renewable energy on economic growth. Crises of certain periods also had a noteworthy effect as well.
Process Optimization and CO2 Emission Analysis of Coal/Biomass Gasification Integrated with a Chemical Looping Process
Ratikorn Sornumpol, Dang Saebea, Amornchai Arpornwichanop, Yaneeporn Patcharavorachot
April 18, 2023 (v1)
Keywords: Biomass, calcium looping, co-gasification, CO2 emission, Coal
Biomass gasification is an attractive technology and one of the pathways for producing hydrogen. Due to the variable seasons and low calorific value of biomass, the addition of coal in the gasifier is suggested because coal has a high calorific value and carbon-to-hydrogen ratio. In general, the gaseous product obtained in gasification always contains a high amount of carbon dioxide, therefore, the co-gasification of biomass and coal should integrate with the calcium looping carbon dioxide capture process to provide purified hydrogen. In this work, the model of the co-gasification of biomass and coal integrated with the calcium looping carbon dioxide capture process was developed through an Aspen Plus simulator. The developed model was used to analyze the performance of this process. The sensitivity analysis demonstrated that increasing the gasification temperature, steam-to-feed (S/F) ratio, calcium oxide-to-feed (CaO/F) ratio, and regenerator temperature could improve hydrogen produc... [more]
Distribution of Rare-Earth Elements in Ashes Produced in the Coal Combustion Process from Power Boilers
Zdzisław Adamczyk, Joanna Komorek, Magdalena Kokowska-Pawłowska, Jacek Nowak
April 18, 2023 (v1)
Subject: Materials
Keywords: bottom ash, Coal, critical raw materials, fly ash, rare-earth elements, REY, yttrium
The growing demand for rare-earth elements and yttrium (REY) in modern technologies has resulted in the systematic depletion of primary ores. For this reason, research is being conducted around the world on alternative sources of rare-earth elements, e.g., on the possibilities of recovering REY from coal waste or coal combustion. The article presents the results of comprehensive tests of the fuel—hard coal, and high-temperature HTA ash, fly ash, and bottom ash. Examined samples were taken from a Polish power plant. In the tests, fuel quality parameters were determined in accordance with the standards; microscopic observations in reflected and transmitted light, as well as a scanning electron microscope (SEM/EDS), were used, and chemical and phase composition were determined using ICP-MS and XRD methods, respectively. The distribution of REY between these ashes was analyzed. Their suitability as alternative sources of REY was assessed. The obtained results showed that the process of har... [more]
Production of Low-Mercury Solid Fuel by Mild Pyrolysis Process
Tadeusz Dziok
April 17, 2023 (v1)
Keywords: Biomass, Coal, mercury emission, mercury removal, waste
Mercury is considered one of the most harmful ecotoxic elements. A main source of its anthropogenic emissions is fuel combustion. For fuels with a high mercury content, costly methods are required to remove mercury from the flue gases. The solution to this problem is to remove mercury from the fuel before combustion. This can be achieved by a mild pyrolysis process. Solid fuel samples with relatively high mercury content were examined. These included waste (refuse-derived fuel, paper, sewage sludge, and rubber), waste wood biomass (hornbeam leaves, pine and spruce bark), and six coal. The mild pyrolysis process was performed at 300 °C in an argon flow of 500 cm3/min. The residence time was 30 min. Proximate and ultimate analysis (including mercury content) was conducted for raw fuels and chars. The process allowed a significant reduction in mercury content from 36 to 97%. Mercury was most easily removed from biomass and waste with the most difficult being from coal. The effectiveness o... [more]
Estimation of Gas Loss in Methodology for Determining Methane Content of Coal Seams
Nikodem Szlązak, Dariusz Obracaj, Marek Korzec
April 13, 2023 (v1)
Subject: Materials
Keywords: Coal, determination methane content, gas loss, methane content of coal
The determination of natural gas content in coal seams is essential to safe mining activities and to estimate gas resources. It is used to estimate methane emissions into workings, which is very important when using preventive measures of methane ignition and explosion. Methane content in a coal seam is mostly determined using a direct method. However, a problem with estimation of gas loss during collecting a sample in a mine occurs in each method. That gas loss is estimated using different procedures. In the Polish mining industry, methane content in a coal seam is mostly determined during roadway advancing faces in coal seams. The differences in procedures for determining methane content in coal in various laboratories gave rise to starting research into developing a new method. This article presents results of study of gas loss unification for the determination of methane content in coal seams. The research focused mainly on determining a uniform method for estimating gas loss using... [more]
Retrofit Decarbonization of Coal Power Plants—A Case Study for Poland
Staffan Qvist, Paweł Gładysz, Łukasz Bartela, Anna Sowiżdżał
April 12, 2023 (v1)
Keywords: Carbon Dioxide, climate change, Coal, decarbonization, Nuclear, renewable, repowering, retrofit decarbonization
Out of 2 TWe of coal power plant capacity in operation globally today, more than half is less than 14 years old. Climate policy related to limiting CO2-emissions makes the longer-term operation of these plants untenable. In this study, we assess the spectrum of available options for the future of both equipment and jobs in the coal power sector by assessing the full scope of “retrofit decarbonization” options. Retrofit decarbonization is an umbrella term that includes adding carbon capture, fuel conversion, and the replacement of coal boilers with new low-carbon energy sources, in each case re-using as much of the existing equipment as economically practicable while reducing or eliminating emissions. This article explores this idea using the Polish coal power fleet as a case study. Retrofit decarbonization in Poland was shown to be most attractive using high-temperature small modular nuclear reactors (SMRs) to replace coal boilers, which can lower upfront capital costs by ~28−35% and l... [more]
Experimental Investigation on the Tensile Strength of Coal: Consideration of the Specimen Size and Water Content
Honghua Song, Yixin Zhao, Yaodong Jiang, Weisheng Du
April 11, 2023 (v1)
Keywords: Coal, fractal dimension, scale effect, tensile strength, water content
We experimentally and theoretically explored the microstructure-related effects of water and specimen size on the tensile strength of coal. Cylindrical coal specimens with different sizes (diameters of 25, 38, and 50 mm) and water contents (immersion time lengths: 0, 4, and 7 days) were processed. The microscopic features and mineral compositions of the coal samples were imaged and characterized via scanning electron microscopy (SEM) and X-ray diffraction (XRD). The physicochemical effects of water on the microstructures and coal matrices were investigated by acoustic emission (AE) and fractal theory. In this research, the tensile strength was found to be reduced in larger specimens, which can be explained by an exponential correlation. Water enhances the scale effect on the tensile strength of coal, although the water content decreases in larger specimens. Meanwhile, greater reductions in tensile strength were observed under the coupled effects of the water and specimen size. Based on... [more]
The Integration of Hybrid Mini Thermal Power Plants into the Energy Complex of the Republic of Vietnam
Guzel Mingaleeva, Olga Afanaseva, Duc Toan Nguen, Dang Nayt Pham, Pietro Zunino
April 4, 2023 (v1)
Keywords: Coal, Exergy Efficiency, hybrid mini thermal power plants, renewable energy resources, thermoeconomic efficiency
The article describes a method of integrating small distributed generation components in the power system of the Republic of Vietnam. The features of the energy system of Vietnam and the technologies used for mini thermal power plants are considered. The classification of small distributed generation components is presented with implantation of the most used resources of Vietnam—fossil and renewable. A generalized methodology for selection and calculation of technological schemes for mini thermal power plants is considered. The schemes of steam-turbine mini thermal power plants operating with coal and gas-turbine mini thermal power plants with solar air heaters are selected. Based on the calculation of the selected mini thermal power plant schemes, their distribution in the territory of the Republic of Vietnam has been obtained. The thermoeconomic efficiency has been chosen as the criterion for the best option for placing mini thermal power plants; its value for the proposed option is... [more]
Laboratory Measurements of the Relative Permeability of Coal: A Review
Shaicheng Shen, Zhiming Fang, Xiaochun Li
April 4, 2023 (v1)
Keywords: Coal, coalbed methane, gas, laboratory experiments, measurement method, measurement technique, relative permeability, Water
The relative permeability of coal to gas and water is an essential parameter for characterizing coalbed methane (CBM) reservoirs and predicting coal seam gas production, particularly in numerical simulations. Although a variety of studies related to the relative permeability of coals have been conducted, the results hardly meet the needs of practical engineering applications. To track the dynamic development of relative permeability measurements in the laboratory, discover the deficiencies, and discuss further work in this field, this paper investigates the relative permeability measurement preparation work and laboratory methods and summarizes the development of techniques used to determine the water saturation during experimentation. The previously determined relative permeability curves are also assembled and classified according to coal rank and the absolute permeability. It is found that the general operations in the relative permeability measurement process are still not standard... [more]
Gini and Entropy-Based Spread Indexes for Primary Energy Consumption Efficiency and CO2 Emission
Hellinton H. Takada, Celma O. Ribeiro, Oswaldo L. V. Costa, Julio M. Stern
April 3, 2023 (v1)
Keywords: carbon emissions, Coal, energy consumption, fossil fuels, generalized entropy index, Gini index, Natural Gas, non-fossil fuels, Petroleum, technology efficiency
Primary energy consumption is one of the key drivers of global CO2 emissions that, in turn, heavily depends on the efficiency of involved technologies. Either improvement in technology efficiency or the expansion of non-fossil fuel consumption requires large investments. The planning and financing of such investments by global policy makers or global energy firms require, in turn, reliable measures of associated global spread and their evolution in time, at least from the point of view of the principles for responsible investment (PRI). In this paper, our main contribution is the introduction of index measures for accessing global spread (that is, measures of inequality or inhomogeneity in the statistical distribution of a related quantity of interest) of technology efficiency and CO2 emission in primary energy consumption. These indexes are based on the Gini index, as used in economical sciences, and generalized entropy measures. Regarding primary energy sources, we consider petroleum... [more]
Failure Behavior and Damage Characteristics of Coal at Different Depths under Triaxial Unloading Based on Acoustic Emission
Anlin Zhang, Ru Zhang, Mingzhong Gao, Zetian Zhang, Zheqiang Jia, Zhaopeng Zhang, Ersheng Zha
March 31, 2023 (v1)
Keywords: acoustic emission (AE), Coal, crack classification, damage, different depths, failure behavior, mining disturbance
The depth effect of coal mechanical behavior seriously affects the safety and efficiency of deep coal mining. To explore the differences in failure behavior and damage characteristics of coal masses at different depths during the coal mining process, based on the consideration of in situ stress environment, physical properties, and mining disturbance of coal seams, triaxial unloading experiments with acoustic emission (AE) monitoring were conducted on coal samples at four different depths taken from the Pingdingshan coal mine area. The results showed that the AE activity of deep coal was more concentrated, and the cumulative AE energy of coal increased with increasing depth. The cumulative AE energy of the 1050-m coal sample was 69 times that of the 300-m coal sample. The b value representing the microcrack scale decreased with increasing depth, and the rupture degree of deep coal increased. The cracking mode of coal was classified and the failure behavior was analyzed. The cumulative... [more]
Petrographic Characteristics of Coal Gasification and Combustion by-Products from High Volatile Bituminous Coal
Barbara Bielowicz
March 31, 2023 (v1)
Keywords: bottom ash, char, Coal, fly ash, gasification
The coal was gasified in a fluidized bed reactor with CO2 as a gasifying agent at 889−980 °C. The coal and gasification residue produced during gasification was burned at temperatures up to 900 °C. The petrographic analysis, gasification residues, and fly and bottom ash resulting from the combustion of coal and chars showed the efficiency of the gasification and combustion processes. The gasification residue primarily comprised inertoids and crassinetwork, which accounted for 60% of the sample. The analysis of the petrographic composition of fly ash revealed that the fly ash formed during the combustion of gasification residue had a higher mineral content. The fly ash from the combustion of gasification products contained significantly less unburned coal compared to that from coal. The samples of the bottom ash from coal combustion were composed of approximately 25% organic matter, most of which was chars. The bottom ash formed from the combustion of coal gasification products was comp... [more]
The Potential Utilizing of Critical Element from Coal and Combustion Residues
Yunhu Hu, Mu You, Guijian Liu, Zhongbing Dong, Facun Jiao, Ying Meng
March 29, 2023 (v1)
Keywords: abundance, Coal, critical element, utilization potential
Strategically critical elements are becoming significant for the rising demand of emerging energy-efficient technologies and high-tech applications. These critical elements are mostly geologically dispersed, and mainly recovered from recycled materials. Coal with high concentrations of critical elements is supposed to stable alternative sources. The abundances of critical elements in coal varies widely among different deposits and regions. The high concentrations of critical elements are found in many Chinese and Russian coal ores. The global mining potential ratio (MPR) is applied and suggests scandium, hafnium, cesium, yttrium, germanium, gallium, thallium, strontium and rare-earth elements could be potential recovery from coal. A number of benefits are expected with the extraction of critical elements during coal utilization.
Paleovegetational Reconstruction and Implications on Formation of Oil Shale and Coal in the Lower Cretaceous Laoheishan Basin (NE China): Evidence from Palynology and Terpenoid Biomarkers
Yu Song, Kai Zhu, Yinbo Xu, Qingtao Meng, Zhaojun Liu, Pingchang Sun, Xiang Ye
March 29, 2023 (v1)
Keywords: Coal, oil shale, paleovegetation, palynology, terpenoid biomarkers
In some cases, the oil shale deposited in shallow lakes may be genetically associated with the coal-bearing successions. Although paleovegetation is an important controlling factor for the formation of oil shale- and coal-bearing successions, few studies have focused on their joint characterization. In this study, a total of twenty-one oil shale and coal samples were collected from the upper member of the Lower Cretaceous Muling Formation (K1ml2) in the Laoheishan Basin, and investigated for their bulk geochemical, maceral, palynological, and terpenoid biomarker characteristics, in order to reconstruct the paleovegetation and reveal its influence on the formation of oil shale and coal. The K1ml2 is subdivided into lower, middle, and upper units. The studied oil shale samples from the lower and upper units display a high ash yield (Ad), low total organic carbon (TOC) and sulfur (S) contents, and limited hydrocarbon generation potential. The studied coal samples from the middle unit are... [more]
Coal Modeling Investigations in International Collaboration in the Light of Bibliometric Analysis of the Problem
Agnieszka Saramak, Daniel Saramak
March 28, 2023 (v1)
Keywords: bibliometric analysis, Coal, mineral processing, Modelling
The article concerns an analysis of records registered in Web of Science (WoS) database related to the problem of coal modeling. All publications registered in the WoS from the time period 1951−2021 were analyzed, mostly in terms of international collaboration, merit content and research areas. It appeared that international scientific cooperation on this topic is differently considered, depending on the country. The leader in terms of the number of documents remains China, while the highest citation counts were gained by research teams, with the USA as the leader. Several sub-categories within research areas could be also divided on the basis of key words, while the most popular topic is connected with energetical aspects of coal utilization.
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