Article
Chemistry, Physical
Wei Lu, Xuedong Zhang, Yang Yuan, Guansheng Qi, Xiangming Hu, Jialiang Li, Yuntao Liang, Baolong Guo
Summary: The study proposed a new type of antioxidant gel foam for coal mine fire prevention and control by introducing procyanidins into the gel system. The gel effectively inhibits coal oxidation, delays the decomposition process of coal, and reduces temperature rise and CO release. In fire extinguishing experiments, the gel shows a rapid temperature reduction at the coal center and achieves stable fire extinguishing without reburning.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Thermodynamics
Yong Yang, Jinbiao Fei, Zhenmin Luo, Hu Wen, Hu Wang
Summary: By using the coal spontaneous combustion experiment platform as the experimental testing method, the characteristic temperature of coal spontaneous combustion was determined through parameters such as heating rate, oxygen consumption rate, gas generation rate, single gas and composite gas index. The relationship between characteristic temperature and each parameter was analyzed, and the corresponding relationship between coal temperature and relevant parameters of gas generation was established. The characteristic temperatures of coal spontaneous combustion were found to be T-1 = 35°C, T-2 = 55°C, T-3 = 75°C, T-4 = 100°C, T-5 = 145°C, T-6 = 190°C, T-7 = 230°C, T-8 = 310°C.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Yibo Tang, Pengwei Guo
Summary: The flammability of polyurethane in underground coal mines and its effects on temperature rise and spontaneous combustion are investigated. The results show that the heating rate of mixed samples of polyurethane and coal is higher than that of any single component. Increasing the proportion of polyurethane and reducing particle size promote temperature rise, while at higher temperatures, a low ventilation rate inhibits spontaneous combustion.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Liyang Gao, Bo Tan, Long Fan, Haiyan Wang, Xiaomeng Li, Wei Lu, Yuangang Jiang
Summary: This paper aims to summarize the similarities and differences in the occurrence mechanisms, monitoring methods, and prevention measures of coal and biomass spontaneous combustion, and explore the technologies and theories that can learn from each other. It seeks to promote the progress of the two in the study of spontaneous combustion mechanism and the development of more advanced spontaneous combustion monitoring and fire prevention technology.
Article
Energy & Fuels
Lulu Sun, Xinwei Lv, Ning Liu, Guansheng Qi, Qiming Huang
Summary: This study investigates the prevention mechanisms of spontaneous coal combustion using thermosensitive composite hydrogels. The results show that the hydrogel undergoes a phase transformation at temperatures above 58 degrees C, providing optimal cooling and suffocation effects to prevent coal combustion. The hydrogel also effectively prevents contact between coal and oxygen, and generates a dehydrating agent and inert gas to inhibit spontaneous combustion. These findings provide guidance for the practical application and development of thermosensitive composite hydrogel materials.
Article
Thermodynamics
Jianwei Cheng, Yuhang Wu, Ziwen Dong, Rui Zhang, Wenbin Wang, Guoying Wei, Tingxiang Chu, Zhaoyang Yu, Yi Qin, Guozhong Liu, Haijian Li
Summary: A novel composite inorganic retarding gel material has been developed for better controlling the fire problem due to coal oxidations. Laboratory tests show that the gel has a good inhibitory effect on the spontaneous combustion process of coal oxidation.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Chaowei Guo, Shuguang Jiang, Hao Shao, Zhengyan Wu, Marc Bascompta
Summary: The presence of secondary oxidation in coal mine goafs affects the indicative ability of a gas indicator for the spontaneous combustion of coal, leading to less accurate early warning systems. In this study, it was found that the chain alkane ratio and the concentrations of oxygen, CO, and C2H4 in secondary oxidation follow the same trends as in primary oxidation, but with lower initial appearance temperature for C2H4. Using C2H4 concentration as an indicator allows for earlier detection of coal spontaneous combustion. The gas produced by secondary oxidation should be considered in the establishment of early warning systems for coal mine goafs.
APPLIED SCIENCES-BASEL
(2023)
Article
Environmental Sciences
Xiyang Fang, Bo Tan, Haiyan Wang, Feiran Wang, Zhuang Zhuang Shao, Changfu Xu, Shaojie Zheng
Summary: Coal spontaneous combustion in the gob poses a significant threat to coal mining operations. This study establishes a multi-field coupling equation and determines the optimal nitrogen injection parameters through on-site verification and simulation analysis, providing valuable insights for preventing and controlling fires.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Energy & Fuels
Minggao Yu, Ning Yang, Zhongyong Liu, Haitao Li, Liang Wang, Mingqiu Wu, Jie Li, Yingying Yu
Summary: A composite gel made of konjac glucomannan (KGM) and expandable graphite (EG) was synthesized and found to effectively inhibit the high-temperature pyrolysis rate of coal, preventing spontaneous coal combustion (SCC) in coal mines.
Article
Thermodynamics
Dongjuan Ma, Xianshu Dong, Liang Yuan, Sheng Xue, Yibo Tang
Summary: This study adopted a novel approach to fire extinguishing using sodium pyrotechnic aerosol (SPA) for controlling underground mine fires. Physical simulation experiments showed that aerosol consisting of NaNO3 and dicyandiamide had a better extinguishing effect than nitrogen, effectively reducing temperature and suppressing fire. This research suggests that SPA has potential for use as a fire extinguishing technique in underground coal mines.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Xiaoxue Xu, Shujie Yuan, Jinhu Li, Shengli Guo, Zhuo Yan
Summary: An environment-friendly intumescent nanogel was developed using organic nano-montmorillonite, acrylamide, sodium lignosulfonate, and ammonium polyphosphate. The gel properties were optimized through an orthogonal experiment. The nanogel effectively prevented coal spontaneous combustion by forming a dense intumescent char layer on the coal samples.
Article
Metallurgy & Metallurgical Engineering
Jianwei Cheng, Wang Luo, Zhongling Zhao, Donghong Jiang, Jianbing Zhao, Leixin Shi, Yuanyuan Liu, Gang Zhao, Zui Wang, Wanting Song, Ke Gao, Guozhong Liu, Wancheng Zheng, Peichao Lu, Yungang Wang
Summary: The article discusses the hazards of coal spontaneous combustion in mines and the measures taken to control it, using a case study to demonstrate the successful control of the fire through detailed monitoring and comprehensive response measures.
MINING METALLURGY & EXPLORATION
(2021)
Article
Environmental Sciences
Jinchang Deng, Shaokun Ge, Haining Qi, Fubao Zhou, Bobo Shi
Summary: The study reveals that long-term spontaneous combustion of coal can have serious impacts on the atmosphere, prompting increased research attention. Through field surveys and modeling analysis, it was found that air pollution in coal fire areas is mainly influenced by combustion conditions and thermophysical parameters. Factor analysis indicates that these areas are primarily affected by sulfur oxides pollution.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Xiangjun Chen, Xiaozhen Dong, Lin Wang, Zhen Huang, Pengfei Cui
Summary: A numerical simulation method was used to analyze the factors affecting the gas concentration in the upper corner of the Yue Nan coal mine working face, and the optimal air intake velocity and mining velocity were determined. Additionally, the wind flow disturbance areas were divided based on the wind speed in the gob, providing reference for gas control.
Review
Energy & Fuels
Moshood Onifade
Summary: Spontaneous combustion is a complex process that results in severe environmental pollution, safety threats, and economic losses, necessitating monitoring and prevention measures.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2022)
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.