Solid Fuel Chemistry最新文献

{"title":"Hydrotreatment of Middle Distillate from Pyrolysis Tar by Using Fixed Bed Reactor","authors":"Janchig Narangerel,&nbsp;Alyeksandr Ariunaa,&nbsp;Oyunchimeg Nasantogtokh,&nbsp;Enkhtur Munkhbat","doi":"10.3103/S0361521924700460","DOIUrl":"10.3103/S0361521924700460","url":null,"abstract":"<p>Hydrotreatment is a crucial operation in the modern oil refining industry, used for removing heteroatoms and hydrogenating aromatic compounds. Middle distillates of coal tar can serve as an alternative feed for producing diesel fuel after heteroatom reduction. Coal tar was obtained through the pyrolysis of Mongolian brown coal at 700°C. The middle distillate, with a boiling range of 220–350°C, was separated from the tar by vacuum distillation, yielding 36.09 wt.%. Hydrotreatment of the middle distillate was carried out at temperatures of 340 and 360°C using a continuous flow, fixed bed reactor filled with a commercial NiMo/Al₂O₃ catalyst. The hydrogen pressure was 6MPa, and the hydrogen flow rate was 0.54 ml/min. The results showed that decreasing the liquid hourly space velocity (LHSV) from 1.55 to 1.03 h^–1 significantly reduced the content of heteroatoms in products from 6.16 to 2.60% and 4.36 to 0.52% for 340 and 360°C, respectively. The total removal of heteroatomic compounds from the middle distillate was highest at 92.36% for the product obtained at 360°C temperature using LHSV 1.03 h^–1.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"59 1","pages":"21 - 26"},"PeriodicalIF":0.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on the Mechanical Properties and Energy Evolution of Coal Rock under Triaxial Cyclic Gradient Loading","authors":"Minbo Zhang,&nbsp;Shilong Zhang,&nbsp;Chunxin Li,&nbsp;Dangyu Zhang,&nbsp;Cuiling Wang,&nbsp;Yan Jin","doi":"10.3103/S0361521924700459","DOIUrl":"10.3103/S0361521924700459","url":null,"abstract":"<p>With the depletion of shallow coal seam resources, deep mining has become a trend, and deep stress makes coal mining in the process of repeated cyclic loading and unloading. In order to study the energy evolution law of mechanical properties of coal and rock under the action of cyclic gradient loading, the RTX-1000 high temperature and high pressure dynamic rock triaxial loading experiment is carried out on coal samples. The changes of residual strain, elastic modulus, input energy density and dissipated energy density of coal and rock under different cyclic gradient loading are compared and analyzed. The results show that with the increase of confining pressure, the number of cyclic gradients of coal and rock samples increases, and the peak strength increases, which are 16.04, 32.04, and 43.92 MPa, respectively, and the axial, radial and volumetric strains have obvious memorability. In the cyclic gradient loading, the residual variable of the coal sample under the same confining pressure decreases sharply and then slowly, and the graph is concave with the number of cycles. Under the same confining pressure and the cyclic loading gradient, the loading elastic modulus is always higher than the unloading elastic modulus, and the elastic mod-ulus of the coal sample gradually decreases under the same cyclic gradient. In the process of cyclic gradient loading, most of the input energy density is stored in the rock sample in the form of elastic strain energy, and the dissipated energy increases between 0.05 and 0.29% of the total input energy in a single cycle, which provides theoretical guidance for deep coal seam mining and roadway support.</p><p>Highlights</p><p>• The variation law of residual strain and elastic modulus of coal samples under cyclic gradient loading were investigated.</p><p>• The stress peaks of coal samples under different confining pressures were 16.04, 32.04, and 43.92 MPa at 5, 8, and 12 MPa, respectively.</p><p>• The calculation formulas of input energy density, elastic energy density, plastic energy density and dissipated energy density of coal samples were presented.</p><p>• The energy of each part of coal sample under the last cycle gradient was studied with the increase of cycle times, which provides theoretical guidance for deep coal mining and roadway support in reality.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"59 1","pages":"10 - 20"},"PeriodicalIF":0.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Magnesium Ion on Combustion Behavior of Loy Yang Lignite","authors":"Ying Chen,&nbsp;Shixian Fang,&nbsp;Xiangchun Liu,&nbsp;Ping Cui","doi":"10.3103/S0361521924700502","DOIUrl":"10.3103/S0361521924700502","url":null,"abstract":"<p>The effects of Mg²⁺ on the combustion behavior of Loy Yang lignite (LY) were studied. The combustion behaviors of all samples were investigated using a thermogravimetric (TG) analyzer. Moreover, all samples were characterized using Fourier transform infrared (FT-IR) spectrometer with a DRIFT model, scanning electron microscope (SEM), and a specific surface area and porosity analyzer. The results showed that Mg²⁺ was successfully loaded into the acid-washed sample (LYA) in the form of carboxylates. The addition of Mg²⁺ blocked partial pores of LYA. Compared with that of LYA, the peak temperatures of the Mg²⁺ loaded samples (LYA_Mg0.05 and LYA_Mg0.1) decreased by 2.0 and 2.4%, respectively. The activation energies of LYA_Mg0.1 and LYA_Mg0.05 were lower than that of LYA. Overall, Mg²⁺ could catalyze the combustion of lignite. The higher the loading content, the more obvious the catalytic effect is. Additionally, we proposed a mechanism of Mg²⁺ catalyzing the combustion of lignite, i.e., Mg²⁺ acts as an oxygen carrier, which could enhance the transport of oxygen. Consequently, a catalytic effect of Mg²⁺ on lignite burning was observed.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"59 1","pages":"53 - 59"},"PeriodicalIF":0.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evolution of Microstructure during Calcination Process and Performance Study of Petroleum Coke","authors":"Xin Zhang,&nbsp;Jiao He,&nbsp;Jingbao Lian,&nbsp;Hongyan Piao,&nbsp;Xin Li","doi":"10.3103/S0361521924700472","DOIUrl":"10.3103/S0361521924700472","url":null,"abstract":"<p>In order to explore the effect of calcination temperature on the microstructure and physicochemical properties of medium and low sulfur petroleum coke, two types of petroleum coke with different sulfur contents were calcined at 600–1400°C. The sulfur content, true density, powder resistivity, Lc value, microstructure and microstructure evolution process of calcined coke were analyzed by DTA-TG-DTG, FT-IR, Raman, polarizing microscope (PLM), FE SEM and other methods. It was found that there is not much difference in the DTA-TG-DTG curves between medium sulfur petroleum coke and low sulfur petroleum coke, and the microstructure evolution process is basically consistent. As the calcination temperature increases, there are significant differences in the growth process and basic properties of carbon crystals in calcined coke, which are closely related to the presence and transformation of sulfur. This study can provide important parameters for the pre-calcined anode desulfurization process in the production of aluminum using medium and low sulfur coke.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"59 1","pages":"27 - 37"},"PeriodicalIF":0.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Regeneration of Sibunit Carbon Material Previously Used in the Adsorption of 2,4-Dichlorophenoxyacetic Acid by Microwave Radiation","authors":"M. D. Vedenyapina,&nbsp;S. A. Kulaishin,&nbsp;A. V. Chistyakov,&nbsp;A. K. Rakishev,&nbsp;S. A. Bulkin,&nbsp;M. V. Tsodikov,&nbsp;G. I. Konstantinov","doi":"10.3103/S0361521924700381","DOIUrl":"10.3103/S0361521924700381","url":null,"abstract":"<p>The possibility of reusing mesoporous Sibunit as an adsorbent for 2,4-dichlorophenoxyacetic acid was studied. The effectiveness of using microwave radiation to restore the adsorption properties of the studied adsorbent was shown. A decrease in the average pore size on the surface of the Sibunit sample was noted as the adsorption–regeneration cycles were carried out without reducing the value of the adsorption capacity.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"58 6","pages":"472 - 476"},"PeriodicalIF":0.8,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the Mechanical Properties and Crack Evolution of Bedding Coal under Splitting Load","authors":"Laisheng Huang,&nbsp;Bo Li,&nbsp;Chao Li,&nbsp;Bing Wu,&nbsp;Jingxin Wang,&nbsp;Yang Li","doi":"10.3103/S0361521924700435","DOIUrl":"10.3103/S0361521924700435","url":null,"abstract":"<p>In order to study the tensile properties and crack evolution of bedding coal under splitting load, Brazilian splitting tests were conducted on bedding coal. Results indicate distinct anisotropic mechanical properties of bedding coal. When the bedding dip angle is 0°, the coal sample exhibits the highest tensile strength and splitting modulus, followed by 30° and 90°, with the lowest values observed at 60°. Under the Brazilian splitting load, the crack propagation mechanism for coal samples with a bedding dip angle of 0° involves a combined tension-shear fracture. For dip angles of 0° and 60°, the crack propagation mechanism gradually shifts from tension-shear to tension failure, while at 90°, the crack propagation mechanism is primarily along the bedding plane in tension. The tensile failure characteristics of coal samples with bedding dip angles of 60° and 90° are more pronounced, and the load- acoustic emission parameter curve shows distinct bedding features. In the case of a 30° bedding dip angle, the failure is mainly due to a combined shear and tension cracking, with the acoustic emission counts exhibiting a multi-stage growth pattern. Furthermore, this study explores the implications of bedding coal fracture morphology for fracturing.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"58 6","pages":"522 - 533"},"PeriodicalIF":0.8,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Combined TG–FTIR Study on the Pyrolysis of Waste Generated in the Coffee Production Chain","authors":"Ya. D. Pudova,&nbsp;Yu. M. Faleeva","doi":"10.3103/S0361521924700332","DOIUrl":"10.3103/S0361521924700332","url":null,"abstract":"<p>The results of a study on the pyrolysis of agricultural (coffee husks and parchment) and agroindustrial (two types of spent coffee grounds) waste from coffee production are presented. A study of the temperature dependence of the weight loss of samples during pyrolysis and the qualitative analysis of the main volatile substances were carried out using a thermogravimetric analyzer (TG) coupled with a Fourier transform infrared spectrometer (FTIR). The main stages of thermal decomposition of the samples were presented at four heating rates of 5, 10, 20, and 30 K/min. The results of an analysis of IR spectra for the volatile components of pyrolysis products of four materials were shown, and the temperature dependences of the absorption band intensities of the main gaseous pyrolysis compounds were plotted.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"58 6","pages":"432 - 440"},"PeriodicalIF":0.8,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Harvesting Time on Biomass and Combustion Quality of Miscanthus lutarioriparius in Dongting Lake Area","authors":"Viswanathan Kinipalayam Eswaran,&nbsp;Senthilkumar Veerasamy,&nbsp;Pradeep Thirumoorthy,&nbsp;Sampathkumar Velusamy","doi":"10.3103/S0361521924700423","DOIUrl":"10.3103/S0361521924700423","url":null,"abstract":"<p>Biomass energy is increasingly recognized as a promising alternative to conventional energy sources, offering potential sustainability and environmental benefits. Miscanthus has emerged as a standout candidate within energy crops, with <i>M. lutarioriparius</i> particularly noteworthy. This research delves into the intricate relationship between the timing of harvest and the resulting biomass yield and combustion quality of <i>M. lutarioriparius</i> in the unique coastal wetlands surrounding China’s Dongting Lake. An extensive field experiment was meticulously executed to explore these dynamics, yielding valuable insights comprehensively. (1) First and foremost, the study unearthed a paradoxical trend: delaying the harvest of <i>M. lutarioriparius</i> led to an increase in the stem-to-leaf ratio. However, this apparent benefit was counterbalanced by a noticeable decrease in overall biomass yield, primarily driven by the shedding of leaves as harvest was delayed. Delving into the intricacies of biomass composition, delayed harvests had a significant impact. (2) Specifically, they resulted in marked reductions in water content, ash content, and hemicellulose levels within <i>M. lutarioriparius</i> biomass. The correlation analysis further underscored the importance of cellulose and lignin, with a strong positive relationship between their content and calorific value, while hemicellulose exhibited a highly significant negative correlation. (3) Additionally, the study ventured into the realm of mineral elements within the biomass. Delayed harvesting precipitated a substantial reduction in their content, with notable fluctuations observed in potassium (K) and calcium (Ca) levels. Furthermore, ash content exhibited positive correlations with potassium (K) and silicon (Si) contents, shedding light on the intricate interplay of mineral elements. A notable silver lining emerged despite the reduced biomass yield associated with delayed harvesting. In a holistic assessment, the optimal window for harvesting <i>M. lutarioriparius</i> to maximize fuel quality was pinpointed to span from late November to the conclusion of January in the subsequent year. This nuanced understanding of harvesting timing can play a pivotal role in optimizing the utilization of <i>M. lutarioriparius</i> as a valuable energy resource.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"58 6","pages":"508 - 521"},"PeriodicalIF":0.8,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on Disaster Mechanism and Prevention of Air Leakage Channel in Shallow Close Distance Coal Seam Group","authors":"Ran Peng,&nbsp;Xiaobin Yang,&nbsp;Wei Li","doi":"10.3103/S036152192470040X","DOIUrl":"10.3103/S036152192470040X","url":null,"abstract":"<p>The shallow-buried close-distance coal seam group has the characteristics of large mining height, shallow burial depth and small interlayer spacing. After coal seam mining, a penetrating air leakage channel is formed on the surface and underground, which is the main cause of low oxygen in the return air corner. This paper, PFC simulation is used to study the caving law of overburden rock and the evolution process of air leakage channel during the mining process of working face. The results show that the low oxygen gas in the goaf of 12 # coal seam mainly migrates to the return corner of the lower 221014 working face. The main medium facilitating this is the interconnected inter-coal seam air leakage channel, and the primary driving force is the substantial and rapid decrease in surface gas pressure, leading to a significant gas pressure difference between the return airway corner and the goaf of the 12 # coal seam. Aiming at the low oxygen phenomenon in the return air corner. The governance measures involving even-pressure ventilation technology were proposed. Theoretical calculations determined a safe gas pressure adjustment range for the return airway corner to be between 88.328 and 88.549 Pa. The pressure equalizing ventilation technology effectively controls the pressure difference between the goaf of 12 # coal seam and 22104 working face, and reduces the air leakage. Finally, the oxygen concentration in the return air corner is increased to prevent excessive fresh air from pouring into the goaf.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"58 6","pages":"485 - 499"},"PeriodicalIF":0.8,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Production of Fuel Briquettes from Carbon-Containing Technogenic Raw Materials","authors":"N. I. Buravchuk,&nbsp;O. V. Guryanova","doi":"10.3103/S0361521924700320","DOIUrl":"10.3103/S0361521924700320","url":null,"abstract":"<p>The article presents the results of experimental studies on the production of fuel briquettes from carbon-containing technogenic raw materials with a certain energy potential, flotation concentrate of coal enrichment sludge and wood and plant residues with binders. The technical characteristics of fuel briquettes of experimental batches are presented. The applicability of the selected binders for obtaining high-quality fuel briquettes was demonstrated. Aspects of the formation of the structure and properties of fuel briquettes are considered.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"58 6","pages":"427 - 431"},"PeriodicalIF":0.8,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142595238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}