Fuel最新文献

{"title":"Experimental study of methane-assisted multi-lateral injector SAGD processes as a novel method for extra-heavy oil recovery in heterogeneous reservoirs","authors":"Xiaofei Sun ,&nbsp;Xiyan Wang ,&nbsp;Jiuning Zhou ,&nbsp;Yongbin Zhao ,&nbsp;Hongxin Li ,&nbsp;Xiangyu Wang ,&nbsp;Xinyu Sun ,&nbsp;Guanglei Xie","doi":"10.1016/j.fuel.2025.135939","DOIUrl":"10.1016/j.fuel.2025.135939","url":null,"abstract":"<div><div>Steam-assisted gravity drainage (SAGD) is a highly efficient thermal recovery technique for producing extra-heavy oil. However, it is still faced with the challenges of high steam usage, high energy losses, and adverse environmental impact. A novel method, called methane-assisted multi-lateral injector SAGD process (MAM-SAGD) was developed in this study for improving the performance of SAGD processes in heterogeneous reservoirs. In this study, for the first time, the large-scale experiments were conducted to study the production performance of MAM-SAGD processes, to clarify the underlying enhanced oil recovery mechanisms of MAM-SAGD processes, and to analyze the impacts of key parameters on the performance of MAM-SAGD processes. The results indicated that the MAM-SAGD process is a feasible method for extra-heavy oil recovery in heterogeneous reservoirs due to the combined mechanisms of multi-lateral injector and methane (CH₄). The highest oil recovery factor of the MAM-SAGD processes was 49.05 %, which was more than 3 times that of the SAGD process. The contributions of multi-lateral injector and CH₄ were 70.8 % and 29.2 %, respectively. The adverse impact degree of the mudstone barrier was ranked as follows: SAGD &gt; multi-lateral injector SAGD &gt; MAM-SAGD. The CH₄ should be co-injected with steam at the late phase of a MAM-SAGD process. An intermediate amount of CH₄ and a reasonable vertical distance between the main and lateral wellbores could significantly enhance the performance of MAM-SAGD processes. The results provide valuable experimental data that can be used to design practical applications of this novel process for producing the extra-heavy oil in heterogeneous reservoirs. More researches including designing application schemes of the MAM-SAGD process and verifying the performance of MAM-SAGD process by reservoir numerical simulations will be required in the future.</div></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":"401 ","pages":"Article 135939"},"PeriodicalIF":6.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation on the evolution characteristics and gas generation mechanism of coal spontaneous combustion-extinction-reignition in sealed fire zones based on ReaxFF simulation","authors":"Hao Lu,&nbsp;Bo Tan,&nbsp;Feiran Wang,&nbsp;Qi Tang,&nbsp;Jiliang Huang,&nbsp;Shanqi Wang,&nbsp;Saiyi Gao","doi":"10.1016/j.fuel.2025.135945","DOIUrl":"10.1016/j.fuel.2025.135945","url":null,"abstract":"<div><div>The reopening and management of sealed fire zones in coal mines is essential for achieving efficient resource utilization. However, the rapid reignition of extinguished coal upon fire zone reopening presents a critical challenge to fire control. To elucidate the underlying mechanisms, this study first characterized BNM coal using XPS, ¹³C NMR and FTIR, followed by the construction and optimization of a coal macromolecular model. Subsequently, ReaxFF molecular dynamics simulations were employed to investigate the dynamic process of coal spontaneous combustion, extinction, and reignition under oxygen-deficient conditions in sealed fire zones. The results indicate that in the spontaneous combustion stage, oxidation and pyrolysis interact significantly, leading to a substantial reduction in char content and a sharp increase in H₂O and CO concentrations. During the extinction and cooling phase, aromatic condensation and crosslinking reactions dominate, resulting in a rise in char mass fraction, with CO and C₂H₂ being the primary gas products. In the reignition phase, active free radicals and unsaturated carbon structures significantly accelerate coal-oxygen reactions, causing an exponential increase in CO as the major gas product. The evolution of H/C and O/C atomic ratios and key reactive functional groups indicates that the spontaneous combustion stage is primarily governed by aliphatic structures and critical active functional groups. The active chemical memory structures formed during the cooling phase serve as precursors for rapid oxidation upon reignition. In the reignition stage, the accumulated diene-type unsaturated carbon species and abundant alkyl free radicals from the spontaneous combustion and extinction phases undergo autocatalytic oxidation, ultimately leading to coal reignition upon fire zone reopening. These findings provide important theoretical support for the safe reopening of fire zones in coal mines.</div></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":"401 ","pages":"Article 135945"},"PeriodicalIF":6.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 thermodynamic model with stability testing for wax precipitation in paraffin systems","authors":"Haoqi Chen ,&nbsp;Bohui Shi ,&nbsp;Enqi Guo ,&nbsp;Shangfei Song ,&nbsp;Qi Kang ,&nbsp;Haiyuan Yao ,&nbsp;Haihong Chen ,&nbsp;Haihao Wu ,&nbsp;Jing Gong","doi":"10.1016/j.fuel.2025.135897","DOIUrl":"10.1016/j.fuel.2025.135897","url":null,"abstract":"<div><div>To accurately predict the thermodynamic behavior of wax phase in oil field gathering and transportation systems, this study developed a novel thermodynamic phase equilibria model for wax precipitation in paraffin mixtures over a wide temperature and pressure region. Based on isothermal flash calculation with stability testing, the model can accurately predict wax precipitated amount and its corresponding composition in the wax phase. The volume-translated PR equation of state, combined with the LCVM mixing rule, described the vapor–liquid phase, while the Predictive Wilson activity model calculated the non-ideality of the solid phase by incorporating the pressure influence from the Poynting term. Inspired by the melting characteristics of wax, the liquid–solid equilibrium ratio as a good initial value for stability testing is adopted to check for the existence of the wax phase. Additionally, this study proposed a new approach to calculate the temperature of wax disappearance conveniently utilizing the tangent-plane-distance (TPD) function. Analyzing the relationship between wax disappearance temperature and TPD function and comparing it with experimental data validate the approach. Also, a number of example calculations demonstrate the robustness and efficiency of the waxy phase equilibrium model, which can effectively address the convergence and continuity issues of the phase boundary.</div></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":"401 ","pages":"Article 135897"},"PeriodicalIF":6.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microwave-assisted functionalization of waste PET plastic with bio-oil: Enhancing compatibility with asphalt through molecular simulation and experimental analysis","authors":"Mingjun Hu ,&nbsp;Kai Zhu ,&nbsp;Qihan Zhang ,&nbsp;Guoqiang Sun ,&nbsp;Arpatjiang Abudurahman","doi":"10.1016/j.fuel.2025.135969","DOIUrl":"10.1016/j.fuel.2025.135969","url":null,"abstract":"<div><div>With the increasing demand for resource recycling, the massive accumulation of waste polyethylene terephthalate (PET) plastic has become a significant environmental burden. However, its high polarity and poor compatibility with asphalt limit its sustainable application in asphalt materials. To address this issue, this study employs microwave technology and bio-oil to depolymerize and surface-functionalize PET plastic, thereby enhancing its compatibility with asphalt. The quantum chemical simulation was conducted to investigate the functionalization mechanism of PET plastic by bio-oil. Then, based on molecular dynamics simulations, the depolymerization behavior of PET plastic and the interaction changes between PET plastic and asphalt under microwave treatment were examined using solubility parameters, binding energy, and dynamic parameters. Finally, the compatibility enhancement effect of microwave-functionalized PET plastic with asphalt was analyzed through rheological tests and fluorescence microscopy. The results indicate that microwave irradiation can degrade the polymerization degree of PET plastic, while bio-oil molecules can undergo functional grafting reactions with the microwave-depolymerized PET products. Molecular simulation results reveal that after microwave treatment, the molecular weight of PET plastic decreases, its aggregation reduces, and its molecular diffusion rate increases, leading to significantly improved compatibility with asphalt. Furthermore, PET plastic modified with bio-oil exhibits a substantial reduction in polarity, achieving the best compatibility with asphalt. Experimental studies confirm the molecular simulation findings. With increasing microwave radiation intensity and prolonged radiation time, the depolymerization of PET plastic and the functionalization modification effect of bio-oil are significantly enhanced. Consequently, the storage stability and uniformity of PET modified asphalt are remarkably improved.</div></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":"401 ","pages":"Article 135969"},"PeriodicalIF":6.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sustainable energy generation through engineered copper molybdate: a ternary metal oxide catalyst for efficient oxygen evolution in alkaline environments","authors":"Hung-Chang Cheng ,&nbsp;Dhanapal Vasu ,&nbsp;Hsin-Yu Lin ,&nbsp;Zhen-Yuan Lan ,&nbsp;Leggins Abraham ,&nbsp;Tetsu Yonezawa ,&nbsp;Te-Wei Chiu","doi":"10.1016/j.fuel.2025.135906","DOIUrl":"10.1016/j.fuel.2025.135906","url":null,"abstract":"<div><div>The world is currently facing an energy shortage, and renewable hydrogen technology is regarded as a key alternative to fossil fuels. Among these technologies, water splitting processes, such as oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), have attracted significant attention for their environmentally friendly nature. This study focuses on the synthesis and application of copper molybdate (Cu₃Mo₂O₉) based ternary metal oxides (TMOs), which exhibits an orthorhombic crystal structure, variable oxidation states, and excellent redox properties, making it highly promising for applications in electrocatalysis and energy storage. Using the hydrothermal method, the reaction solution pH was adjusted to identify the sample with optimal crystallinity and structural characteristics. Experimental results show that Cu₃Mo₂O₉ nanoparticles with superior crystallinity was successfully synthesized at pH 11. The optimized pH electrocatalyst exhibits better OER with an overpotential of 170 mV at a current density of 10 mA cm⁻² and Tafel value of 153 mV/dec. TMOs have high specific capacitance and excellent stability, highlighting its potential as an energy material.</div></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":"401 ","pages":"Article 135906"},"PeriodicalIF":6.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanism research and field practice of elastic sand-carrying capacity in novel-functionality slickwater","authors":"Hao Bai,&nbsp;Junlin Wu,&nbsp;Fujian Zhou,&nbsp;Zhiyuan Ding,&nbsp;Xinlei Liu,&nbsp;Sasa Yang,&nbsp;Yunjin Wang,&nbsp;Fangzhou Xu,&nbsp;Erdong Yao","doi":"10.1016/j.fuel.2025.135962","DOIUrl":"10.1016/j.fuel.2025.135962","url":null,"abstract":"<div><div>Slickwater fracturing fluid is commonly used for unconventional oil and gas reservoirs, but its proppant-carrying capacity is limited. Enhancing this capacity without increasing viscosity significantly is a key challenge. The study constructs a device to quantify fluid viscoelastic sand carrying, using pure viscous glycerol as a benchmark fluid. The research explores the impact of fluid elasticity (G’=0.001 ∼ 10,000 Pa) on sand settling (some types of processed sand can be used as proppants), leading to a revised sand-carrying settling formula. Experimental results demonstrate that the laboratory-synthesized viscoelastic slickwater (VSW), despite exhibiting power-law behavior, possesses superior elasticity and at least 90 % lower settling rate of single-particle sand than glycols of matched viscosity, establishing a non-linear relationship between sand concentration and settling time. By considering the equivalent viscosity of elastic effects through coupling, the applicability of the single-particle Stokes settling formula is extended to describe the settling behavior of sand in viscoelastic fluid. Dynamic sand-carrying experiments within fractures reveal that sand concentration, shear rate, viscosity, and elasticity collectively influence sand settling. Highly elastic fluids show superior dynamic sand-carrying effects, with the concentration of friction reducer affecting sand-carrying capacity. The modified single-particle settling rate V_V improves the calculation of dynamic sand-carrying settling. Concentric-cylinder experiment highlights that elastic sand-carrying is more sensitive to shear rate response, and highly elastic fluids can establish dominance in elastic sand-carrying at lower shear rates. Combined with the concentric-cylinder sand-carrying experiment, elastic sand-carrying is more sensitive to shear rate response, and highly elastic fluids can establish dominance in elastic sand-carrying at lower shear rates (with elasticity/viscoelasticity ratio exceeding 90 %). VSW slickwater forms a network structure, displaying good elasticity and sand-carrying capacity. The combination of the two sand-carrying devices, along with the revised settling formula and the sand-carrying settling threshold diagram, is effectively applicable to VSW fluids. This combination accurately predicts the settling behavior of multi-particle sand in highly elastic fluids within wellbores and fractures, providing critical guidance for future fracturing applications.</div></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":"401 ","pages":"Article 135962"},"PeriodicalIF":6.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating the effects of flow regime on hydrogen transport in salt rock","authors":"Lin Yuan,&nbsp;Adel Najafimarghmaleki,&nbsp;Hassan Dehghanpour","doi":"10.1016/j.fuel.2025.135737","DOIUrl":"10.1016/j.fuel.2025.135737","url":null,"abstract":"<div><div>Underground hydrogen storage (UHS) in salt caverns is emerging as a promising solution for the transition to a sustainable energy future. However, a thorough understanding of hydrogen flow mechanisms through salt rock is essential to ensure safe and efficient storage operations. In this study, we conducted hydrogen flow experiments in salt rocks using the pressure pulse decay (PPD) method, covering a range of hydrogen pore pressures from 0.4 MPa to 7.5 MPa within the slip and transitional flow regimes (Knudsen numbers between 0.04 and 1.5). The Knudsen numbers were determined by measuring the pore size distribution (PSD) of the salt rock samples and assigning an average pore size to each sample based on the measured PSD. Our results indicate that the intrinsic permeability of the tested salt rock samples ranges from 5 × 10⁻²¹ m² to 1.0 × 10⁻²⁰ m². However, a significant enhancement in apparent permeability, up to 10 times the intrinsic permeability was observed, particularly at lower pressures. This permeability enhancement is attributed to the nanoscale pore structure of salt rocks, where the mean free path of hydrogen becomes comparable to the pore sizes, leading to a shift from slip flow to the transitional flow regime. The results further reveal that the first-order slip model underestimates the apparent permeability in the transitional flow regime, despite its satisfactory accuracy in the slip region. Moreover, the higher-order slip model demonstrates acceptable accuracy across both the slip and transitional flow regimes.</div></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":"401 ","pages":"Article 135737"},"PeriodicalIF":6.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fuel consumption of diesel, natural gas, hybrid, full electric and hydrogen fuel cells based buses: A simulated comparison using standard road cycles and gradeability tests","authors":"Ahmet Fatih Kaya ,&nbsp;Marco Puglia ,&nbsp;Nicolò Morselli ,&nbsp;Giulio Allesina ,&nbsp;Simone Pedrazzi","doi":"10.1016/j.fuel.2025.135938","DOIUrl":"10.1016/j.fuel.2025.135938","url":null,"abstract":"<div><div>Due to the detrimental environmental impact of diesel and gasoline vehicles, alternative propulsion technologies—such as hybrid electric, battery electric, and fuel cell vehicles—have garnered increased attention. However, no studies were found that analyse both gradeability and fuel consumption across varying road inclines for different bus types—diesel, compressed natural gas (CNG), hybrid electric, battery electric, and fuel cell—while considering the impact of A/C operation. Additionally, limited research has addressed the influence of critical factors, such as bus weight, drag coefficient, and wheel radius, on fuel consumption for these buses. This study addresses this gap by evaluating the fuel consumption and gradeability of five bus types (diesel, CNG, hybrid electric, battery electric, and fuel cell) using the MATLAB/Simulink-based ADVISOR tool.</div><div>Fuel consumption was analysed over the Orange County Transit Authority (OCTA) drive cycle under both A/C on and off conditions, and the effects of key vehicle parameters—bus weight, drag coefficient, and wheel radius—were investigated. Fuel consumption was also assessed on the modified Central Business District (CBD-14) drive cycle at 0 %, 2 %, and 4 % road grades. Gradeability tests were conducted at 20 and 40 km/h.</div><div>In gasoline equivalent, the battery electric bus exhibited the lowest fuel consumption (29.9 L/100 km with A/C off and 38.4 L/100 km with A/C on), while the CNG bus showed the highest values (87.3 L/100 km with A/C off and 106.9 L/100 km with A/C on). Among the examined parameters, bus weight had the greatest impact on fuel consumption, whereas drag coefficient was the least influential. For a 2 % road grade, the fuel cell bus experienced the largest increase in consumption (78 % with A/C off; 35.5 % for the electric bus with A/C on), while the hybrid electric bus showed the smallest increase. In gradeability tests, the hybrid electric bus achieved the highest climbing capability—22.5 % at 20 km/h and 10.3 % at 40 km/h (A/C off)—compared to the fuel cell bus, which reached only 12.2 % and 7.0 %, respectively; similar trends were observed with A/C on. These findings provide valuable insights into the operational efficiency of different bus technologies under real-world driving conditions.</div></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":"401 ","pages":"Article 135938"},"PeriodicalIF":6.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanism of energy instability release during coal and gas outburst","authors":"Yunfu Li ,&nbsp;Chaolin Zhang ,&nbsp;Enyuan Wang ,&nbsp;Yong Kang ,&nbsp;Jiawei Chen","doi":"10.1016/j.fuel.2025.135961","DOIUrl":"10.1016/j.fuel.2025.135961","url":null,"abstract":"<div><div>As coal mining progresses deeper each year, the risks and hazards associated with coal and gas outbursts become increasingly severe. Therefore, this study employs a combination of physical experiments and numerical simulations to investigate the mechanisms of outbursts from the perspectives of coal failure and energy release. Based on physical experiments with four sets of permeability values (3.21, 7.62, 11.44, and 16.39 mD), numerical models for outburst-prone (3.21, 7.62, and 11.44 mD) and non-outburst-prone (16.39 mD) results were established. It is found that the gas pressure in both physical experiments and numerical simulations of outbursts shows high consistency, with gas pressure during outbursts exhibiting three distinct stages: delayed decline, rapid decline, and stabilization. The lower the coal permeability, the higher the peak seepage force and the longer its duration. Horizontal tensile stress decreases as permeability increases, with a shorter duration. Considering factors related to seepage force, such as gas pressure, horizontal stress, and friction between coal bodies, failure conditions of the coal were established, revealing that lower-permeability coal is more prone to failure. The coal with 16.39 mD never reached the failure condition, consistent with the absence of outburst in this case. During energy release in outbursts, the elastic energy and free gas expansion energy is of the same order of magnitude, while the desorbed gas expansion energy is approximately 1 ∼ 2 orders of magnitude higher than both. Gas expansion energy for pressure-dominated outburst is the primary energy source and decreases with the increase of permeability. The main energy during outbursts is used for coal fragmentation and transport, with the kinetic energy of coal exceeding the energy for fragmentation. The proportion of breakage work in energy dissipation increases with the permeability. The energy sources obtained from numerical simulations align closely with the energy dissipation calculated from physical experiments, validating the accuracy of the numerical model. Furthermore, the mechanisms of energy instability release during outbursts were explained from both microscopic, macroscopic and coal seam mechanics and energy evolution perspectives. The findings of this study provide valuable guidance for understanding outbursts.</div></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":"401 ","pages":"Article 135961"},"PeriodicalIF":6.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characteristics of fractal evolution of sectional fractures in tectonic coal assemblages with different loads based on CT scans","authors":"Zechen Chang ,&nbsp;Pengxiang Zhao ,&nbsp;Xiaochuan Ma ,&nbsp;Wen Lei ,&nbsp;Yingying Liu ,&nbsp;Laolao Wang ,&nbsp;Xu Guo ,&nbsp;Yuanjia Liu","doi":"10.1016/j.fuel.2025.135928","DOIUrl":"10.1016/j.fuel.2025.135928","url":null,"abstract":"<div><div>To study the fractal structure of planar cracks in tectonic coal composites during the damage process under load, uniaxial loading tests were conducted on the specimens of structural coal composites as the research objects. The fractal characteristics of the surface fracture propagation of the loaded structural coal composite specimens were quantitatively characterized by using CT scanning equipment and Avizo image analysis software. The results shown that the transverse fractal dimension, the longitudinal fractal dimension and the fracture pixel ratio increased linearly with the increase of load. The changes in fractal dimensions and fracture pixel ratio were mainly concentrated in structural coal. The longitudinal cleavage dimension and pixel ratio shown an upward-downward-upward trend with the variation of the load. Under the action of continuous loading, the cleavage structure of the structural coal pores was destroyed first. When the stress at the tip of the crack was greater than that at the interface, the penetration effect of the crack could propagate. Meanwhile, the increase in stress led to the generation of interfacial additional stress at the lower interface, and the cleavage developed downward, resulting in the overall fracture of the specimen. The above research results could provide theoretical support for the prevention and treatment of coal and gas hernias.</div></div>","PeriodicalId":325,"journal":{"name":"Fuel","volume":"401 ","pages":"Article 135928"},"PeriodicalIF":6.7,"publicationDate":"2025-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}