Solid Fuel Chemistry最新文献

{"title":"Influence of Different Particle Sizes on Spontaneous Combustion Characteristics of Coal","authors":"Song Wei,&nbsp;Yuqing Wei,&nbsp;Zongxiang Li","doi":"10.3103/S0361521924700496","DOIUrl":"10.3103/S0361521924700496","url":null,"abstract":"<p>Spontaneous combustion of coal is one of the important factors affecting coal mine safety. Many coal mine accidents are caused by spontaneous combustion of coal In order to study the influence of particle size on coal oxidation temperature rise, a temperature programmed test system was used to study the gas generation law in oxidation temperature rise of coal samples with different particle sizes in Dongrong Coal Mine. The thermal reaction of five different particle sizes of coal was studied by differential scanning calorimetry in thermal method The results show that the smaller the particle size, the greater the gas release of coal samples; With the decrease of particle size of coal sample, the reaction area between coal sample and oxygen increases, and the cross point temperature corresponds The particle size of coal sample has obvious influence on the tendency of coal spontaneous combustion. It is of practical significance to study the difficulty of coal spontaneous combustion by using activation energy. According to the experimental data, it is necessary to prevent and control coal mine fires.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"59 1","pages":"48 - 52"},"PeriodicalIF":0.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513311","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":"Structure Features of Humic Acids Isolated from Oxidized Kuzbass Coal and Yakutia Brown Coal","authors":"T. M. Solov’ev,&nbsp;G. Shaikhislam,&nbsp;S. A. Epshtein,&nbsp;N. N. Kondrat’ev,&nbsp;S. I. Sivtsev,&nbsp;M. D. Sokolova","doi":"10.3103/S0361521924700447","DOIUrl":"10.3103/S0361521924700447","url":null,"abstract":"<p>The article presents the results of a study of the structure of humic acids isolated from brown coals of Yakutia and oxidized coals of Kuzbass using nuclear magnetic resonance spectroscopy and IR spectroscopy. Based on the ¹³C NMR spectra, their structural parameters, such as the aromaticity index and hydrophobicity index, were calculated. It was noted that the humic acids of oxidized coals were characterized by higher values of the aromaticity and hydrophobicity indices than those of the humic acids of brown coals. The results of titrimetric analysis showed that humic acids isolated from oxidized coals were characterized by a higher concentration of carboxyl and carbonyl groups. Based on the study, it was suggested that the humic acids of brown coals from Yakutia will have stronger growth-stimulating properties than the humic acids of oxidized coals from Kuzbass.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"59 1","pages":"1 - 9"},"PeriodicalIF":0.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513316","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":"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":"The Change in the Distribution of the ‘Three Zones’ of Spontaneous Combustion of Coal in a Coal Mine Goaf with a Retained Roadway by Roof Cutting","authors":"Lin Li,&nbsp;Shufan Zhang,&nbsp;Xiangjun Chen,&nbsp;Zhiqiang Li,&nbsp;Lin Wang,&nbsp;Junwei Yuan","doi":"10.3103/S0361521924700514","DOIUrl":"10.3103/S0361521924700514","url":null,"abstract":"<p>The roof-cutting and pressure-release (RCPR) mining mode can eliminate coal pillar between the adjacent mining faces by automatically forming roadways, which shows the better mining efficiency and economy than the traditional longwall mining mode. However, this mining mode causes changes in the collapse characteristics of the overlying rock and air leakage in a coal mine goaf, which may influence spontaneous combustion of coal in a coal mine goaf. To study the distribution of the spontaneous coal combustion zone in the coal mine goaf under the RCPR mining mode, the distributions of oxygen concentration and temperature in a coal mine goaf are simulated and analyzed after the simulation verification to reveal the new characteristics of the spontaneous coal combustion zone. The research results show that (1) the spontaneous coal oxidation zone is in the type of letter C, different from the one under the traditional longwall mining mode; (2) the air leakage pathway in the type of letter S causes the unique spontaneous coal oxidation zone, which is different from the air leakage pathway in the type of right parenthesis under the traditional longwall mining mode; (3) a temperature index to divide the spontaneous coal combustion zone is determined by the comparison between the temperature distribution and oxygen concentration distribution.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"59 1","pages":"60 - 75"},"PeriodicalIF":0.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513317","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":"Experimental Study on Characteristics of Gas Migration and Dispersion in One Dimensional Space","authors":"Ji Wu,&nbsp;Zongxiang Li,&nbsp;Shuoran Huang,&nbsp;Nan Jia","doi":"10.3103/S0361521924700484","DOIUrl":"10.3103/S0361521924700484","url":null,"abstract":"<p>Mine counter wind is an important relief measure to control airflow when disaster occurs in mine. Once a fire occurs in the main inlet area of the mine, in order to prevent the expansion of the disaster, it is necessary to carry out mine counter wind.Windy well gas ventilation system during mine air reverse distribution of gas migration is more complex, rely on experimental method is difficult to clearly grasp the mineral sheers distribution of gas migration during the wind, combined with the practice, rarely used against the wind, the lack of mineral sheers anti wind during gas migration distribution in ventilation system, resulting in many cases, difficult to make a decision on against the wind, Therefore, it is necessary to use the computer simulation program to simulate and study the reverse wind in the high gas mine with multiple air shafts. And gas migration in mine is one of the most important parameters in simulation of dispersion dispersion coefficient of gas migration, is for the study of reverse wind during the migration of gas in mine network system diffusion process, the formation of high concentration of gas cloud caused by catastrophe rule research and plan technical analysis, gas migration characteristics of dispersion experiments.</p>","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"59 1","pages":"38 - 47"},"PeriodicalIF":0.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513312","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":"Erratum to: Effect of Limestone Addition to Coal on SO2 Emission Control and Erosion-Corrosion Behaviour of Rifle Bore Bed Tube in AFBC Boiler","authors":"K. Ravi,&nbsp;M. Matheswaran,&nbsp;S. A. Srinivasan","doi":"10.3103/S036152192501001X","DOIUrl":"10.3103/S036152192501001X","url":null,"abstract":"","PeriodicalId":779,"journal":{"name":"Solid Fuel Chemistry","volume":"59 1","pages":"76 - 76"},"PeriodicalIF":0.8,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143513319","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}