Article
Energy & Fuels
Huan Cheng, Yinghua Liang, Rui Guo, Zhang Sun, Qi Wang, Quan'an Xie, Jieping Wang
Summary: The study found that the correlation between the indices representing coke strength and reactivity in the new methods was significantly lower than that in the conventional NSC method. Coke strength after reaction was more susceptible to solution loss degree and reaction temperature compared to coke reactivity. Initial reaction temperature was found to be relatively independent of coke reactivity and strength after reaction.
Article
Energy & Fuels
Karen M. Steel, David R. Jenkins, Reydick D. Balucan, Merrick R. Mahoney
Summary: The study identified preferred pathways in the pore microstructure of coke, with changes in permeability and tortuosity observed with direction. Additionally, the mechanical properties of coke were found to exhibit significant anisotropy, which could affect its strength characteristics.
Article
Chemistry, Analytical
Yixin Chen, Arash Tahmasebi, Soonho Lee, Jianglong Yu
Summary: The quality of coke greatly affects the performance of blast furnace, and coal properties and coke structure are important factors influencing coke quality. This study investigates the evolution and transformation of carbon structures during the coking process of six Australian coking coals, aiming to establish correlations between carbon structures of coke, coal properties, and coke strength. Results show that the carbon structure of coke is closely related to its cold strength parameters.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Review
Chemistry, Physical
Heng Zheng, Runsheng Xu, Jianliang Zhang, Oday Daghagheleh, Johannes Schenk, Chuanhui Li, Wei Wang
Summary: This review discusses the influence of coke structure on its performance, dividing coke structures into chemical structure, physical structure, and optical texture. The characterization methods for these structures are reviewed, and an idea for constructing a coke molecular structural model is proposed.
Article
Physics, Applied
Wenliang Zhu, Hayata Imamura, Elia Marin, Tetsuya Adachi, Nao Miyamoto, Toshiro Yamamoto, Narisato Kanamura, Giuseppe Pezzotti
Summary: The study found that the microstructure of HAp ceramics is significantly influenced by different temperatures, and suitable thermal treatment can effectively adjust their properties, including microstructure, chemical composition, and mechanical hardness.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Green & Sustainable Science & Technology
Lina Kieush, Andrii Koveria, Johannes Schenk, Kanay Rysbekov, Vasyl Lozynskyi, Heng Zheng, Azamat Matayev
Summary: This paper studies the impact of nine industrial coal blends on coke quality using petrographic analysis and discusses the efficient use of coals and preparation of coal mixtures in industrial conditions for sustainable cokemaking. The research indicates that the petrographic properties of coal blends are reliable parameters for assessing coke quality under conditions of unstable raw material base, multi-component blends, and changes in coking regimes.
Article
Energy & Fuels
Jun Zhao, Hong Liu, Haochen Zhang, Xiaolin Song, Haibin Zuo, Guangwei Wang, Zhigao Xu, Ming Wu, Zhenyue Zhang, Ru'an Chi
Summary: This study focuses on the utilization of low-rank coal and biomass residue in the coking process. Hypercoal, produced through co-thermal extraction, was investigated as a component in the coking process. The study found that the inclusion of 15% hypercoal in the coal blend resulted in improved compressive and drum strengths of the coke. Furthermore, the high vitrinite content in hypercoal contributed to the formation of mosaics within the coke, enhancing its cold strength.
Article
Energy & Fuels
Richard Sakurovs, Mihaela Grigore, Anna Sokolova, Jitendra Mata
Summary: Small Angle Neutron Scattering and Ultra Small Angle Neutron Scattering were used to investigate the changes in pore size distribution of three cokes prepared from Australian coals after annealing at temperatures of 1400 and 1600 degrees C. The study found that annealing caused substantial changes in pore size distribution, with the greatest percentage increase occurring around 10 nm pore size. The number of open pores increased significantly, while the number of closed pores decreased slightly for pores in the size range of 100 nm to 2 mu m. The effect of annealing on pore numbers decreased with increasing pore size above 100 nm.
Article
Materials Science, Multidisciplinary
Dongqing He, Zihan Feng, Wenwen Zheng, Wensheng Li, Lunlin Shang, Haimin Zhai, Bo Cheng, Xinjian Zhang
Summary: The post-deposition annealing of AlCrN films was investigated, and it was found that oxidation occurred at 600℃, leading to decreased toughness and resistance to plastic deformation as well as deteriorated wear resistance. At 800℃, obvious oxidation of AlN and the formation of Al2O3 were observed. High temperature annealing promoted the coalescence of Cr on the film surface and the formation of a replacement solid solution of Cr-O-Al, improving the mechanical properties of the annealed films. The tribological properties of the films were not significantly affected by annealing at temperatures other than 600℃.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Metallurgy & Metallurgical Engineering
Zohreh Yazdani, Mohammad Reza Toroghinejad, Hossein Edris
Summary: The fabrication process of Al-TiAl3 nanocomposite through cold roll bonding, annealing, and accumulative roll bonding resulted in ultrafine Al grains and TiAl3 particles, leading to improved strength and hardness of the final composite material.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Energy & Fuels
Apsara S. Jayasekara, Brody Brooks, Karen Steel, Pramod Koshy, Kim Hockings, Arash Tahmasebi
Summary: The steel industry is responsible for about 7% of global greenhouse gas emissions, and replacing coal with microalgae biomass for coke production can have a positive impact on reducing CO2 emissions.
Article
Materials Science, Multidisciplinary
Dege Chen, Hongmei Zhang, Dadong Zhao, Yingyi Liu, Zhengyi Jiang
Summary: In this research, ultra-thin Cu/Al metallic composite sheets were successfully prepared using a self-designed four-high laboratory micro mill. The effect of different annealing temperatures on the microstructure and element diffusion at the Cu/Al interface was investigated. The results showed that grain refinement promoted element interdiffusion, with the formation of micropores and microcracks at annealing temperatures of 350-450°C. Metallurgical bonding occurred at an annealing temperature of 350°C, and the highest degree of element diffusion was observed at 500°C.
Article
Energy & Fuels
Deepak Kumar, V. K. Saxena, H. P. Tiwari, V. K. Tiwary
Summary: Traditionally, coke reactivity index and coke strength after reaction are evaluated by reacting coke with carbon dioxide in standard conditions. Developing a method for predicting almost real-time data is essential due to the lengthy testing methodology. The newly developed methodology by infrared gas analyzer can provide real-time coke reactivity index and estimate the coke strength within 10 minutes of reaction time.
INTERNATIONAL JOURNAL OF COAL PREPARATION AND UTILIZATION
(2022)
Article
Materials Science, Coatings & Films
Biao Huang, Er-geng Zhang, Hao-ming Du, Qiang Chen, Dan-dan Liang, Qi An, Qiong Zhou
Summary: The microstructure, mechanical properties, and tribological properties of CrAlTiN coatings were systematically investigated at different annealing temperatures. The results show that the hardness of the coating decreases with increasing annealing temperature, while the elastic strain resistance first increases and then decreases. The preferred annealing temperature effectively regulates the microstructure and improves the mechanical and tribological properties of the CrAlTiN coating.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Mingwang Xie, Pengfei Zhou, Wei Huang, Huiming Chen, Liukui Gong, Weibin Xie, Hang Wang, Bin Yang
Summary: The precipitation behavior and microstructural evolution of a Cu-15 wt%Ag alloy were studied during annealing. Continuous and discontinuous precipitation occurred simultaneously, accompanied by recovery and recrystallization. The strength and electrical resistivity decreased due to these changes. Controlling annealing conditions reduced dislocation density and solute atom concentration, weakening scattering effects. Nanoscale Ag precipitates from continuous precipitation provided stronger precipitation strengthening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Energy & Fuels
Rui Pan, Guangqing Zhang, Shiyuan Li, Xuelin Zheng, Changzhuo Xu, Zongyang Fan
Summary: This study examined the impact of interbedded interfaces on fracture propagation during hydraulic fracturing through experiments and digital image correlation. It was found that interbedded interfaces can restrict the extension of the main fracture, affecting fracturing performance.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Thermodynamics
Sai Meng, Paul Zulli, Chaohe Yang, Zhe Wang, Qingbo Meng, Guangqing Zhang
Summary: This article introduces a novel concept for an intensified gasification process and compares it with conventional fluidised bed gasification process to demonstrate potential improvements in energy and exergy efficiencies. The intensified gasification process can increase energy and exergy efficiencies compared to the conventional process within a certain temperature range.
Article
Energy & Fuels
Yuanxun Nie, Bisheng Wu, Guangqing Zhang, Li Zhang, Zhengda Lei, Shaoyi Cheng, Haitao Zhang, Shiyuan Li
Summary: This study investigates the CO2-brine-rock interactions and their effects on the microstructure of sandstone. The results show that confining pressure reduces the degree of damage in different scales and alters the pore system. The study also reveals that CO2-brine saturation increases porosity and decreases the fractal dimension of the sandstone.
Review
Energy & Fuels
Jianlin Zhao, Junjian Wang, Guangqing Zhang, Dawei Zhou, Li Chen, Hari Viswanathan, Qinjun Kang
Summary: Shale gas reservoirs are an important unconventional resource with unique characteristics. The ultrasmall pore sizes in shale induce the nanopore confinement effect and gas adsorption. The lattice Boltzmann method (LBM) has been modified to simulate gas flow and adsorption in shale rocks, and four types of LBM models have been developed for this purpose. LBM can efficiently estimate shale gas permeability, describe pore-scale flow behaviors, and address the influence of gas adsorption, but challenges remain in its application for shale gas flow and adsorption simulations.
Article
Energy & Fuels
Yanan Hou, Yan Peng, Yishan Liu, Zhangxin Chen, Baitao Fan, Zhiming Yin, Guangqing Zhang
Summary: This study compares the influence of constant amplitude, constant mean stress (CACMS) cyclic loading and constant amplitude, increasing mean stress (CAIMS) cyclic loading on the strength and fatigue lifetime of shale using a series of uniaxial compression tests. A fatigue lifetime model for CAIMS is established and a nonlinear damage accumulation model is proposed to predict damage evolution. It is found that the CAIMS cyclic loading significantly decreases the strength and fatigue lifetime of shale, making it a less efficient loading type compared to CACMS.
Article
Engineering, Geological
Lei Chen, Guangqing Zhang, Min Zhang, Chaohao Zhai, Zongyang Fan, Jianlin Zhao, Dawei Zhou, Shiyuan Li
Summary: In this paper, the slip nucleation during fracture propagation in laminated shale formations during hydraulic fracturing was studied using macro and micro three-point bending experiments, as well as visual hydraulic fracturing experiments. The digital image correlation method (DIC) was used to monitor the interlaminar deformation and a method to identify the slip nucleation zone (SNZ) using DIC was proposed. The findings of this study could enhance understanding of the generation mechanism of slips in shale reservoirs during hydraulic fracturing.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Chemistry, Physical
Di Pan, Guangqing Zhang, Fanghui Jia, Lianjie Li, Tao Zhang, Yao Lu, Hui Wu, Ming Yang, Zhengyi Jiang
Summary: In this paper, the effects of glycerol-based lubricant containing TiO2 NPs on micro deep drawing (MDD) of austenitic stainless steel (ASS) SUS301 were studied. The use of TiO2 nanolubricants significantly improved the quality of the drawn cups in terms of decreased wrinkling and surface roughness. The concentration of TiO2 NPs influenced lubricity by reducing friction during the MDD process, and the optimal concentration was found to be 2 wt%. The lubrication mechanisms were derived from the mending effects of TiO2 NPs and the formation of thin lubricant films associated with open and close lubricant pockets theory.
Article
Engineering, Mechanical
Wenrui Wang, Guangqing Zhang, Hu Cao, Lei Chen, Chunyang Zhao
Summary: Alternate fracturing is a more effective method for increasing natural gas production, as it can form complex fracture networks and control fracture geometry more efficiently. The critical factors affecting the generation of branch fractures are the fracture spacing and the number of main fractures.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Di Pan, Guangqing Zhang, Hui Wu, Fanghui Jia, Lianjie Li, Tao Zhang, Ming Yang, Zhengyi Jiang
Summary: In this study, micro deep drawing experiments were conducted on an austenitic stainless steel using lubricants containing different mass fractions of graphene nanosheets (GNS) in ethanol. The friction-reduction mechanisms of the GNS in the micro deep drawing process were discussed by analyzing the profile and surface roughness of the microcups. The results showed that GNS could reduce friction and improve surface quality, with the lubricant containing 10 mg/ml GNS achieving the best results in terms of drawing force, wrinkling, and surface roughness.
Article
Engineering, Chemical
Di Pan, Guangqing Zhang, Fanghui Jia, Yao Lu, Jun Wang, Zhou Li, Lianjie Li, Ming Yang, Zhengyi Jiang
Summary: This study examines the influence of TiO2 nanolubricants and graphene lubricants on micro deep drawing (MDD). The research findings show that using a 5.0 mg/mL graphene lubricant together with TiO2 nanolubricants can significantly reduce drawing force and improve the consistency of the produced microcups.
Article
Energy & Fuels
Xuelin Zheng, Guangqing Zhang, Lei Chen, Min Zhang, Renyi Qiu, Dawei Zhou, Jianlin Zhao
Summary: Hydraulic fracturing is crucial for shale oil and gas production, and using liquid nitrogen (LN2) as a fracturing agent shows promise. This study combines laboratory experiments and numerical simulations to analyze the cryogenic fracturing mechanisms of LN2 in shale. The experiments use digital image correlation to record the fracturing processes and observe three typical modes of induced fractures in shale with beddings. A numerical model is developed to simulate the thermal-mechanical coupling and analyze the applicability of different fracture criteria. The findings provide references for shale fracturing treatments with LN2.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Review
Energy & Fuels
Jianlin Zhao, Junjian Wang, Guangqing Zhang, Dawei Zhou, Li Chen, Hari Viswanathan, Qinjun Kang
Summary: This review examines four lattice Boltzmann models developed for simulating shale gas flow/adsorption and discusses the current challenges in applying these models.
Article
Materials Science, Multidisciplinary
Huaixuan Feng, Xue-feng She, Xiao-min You, Guang-qing Zhang, Jing-song Wang, Qing-guo Xue
Summary: This work investigated the extraction of iron and removal of sodium from red mud using the technology of carbothermic reduction. The effects of various parameters on melting separation and de-alkalization were studied. Optimal conditions for metallization rate and sodium removal were achieved at a reduction temperature of 1,450 degrees C, basicity of 1.5, and reduction time of 12 min. The microstructure of the pellets revealed increased aggregation of iron particles at a basicity of 1.5. X-ray diffraction analysis indicated that the final phase composition of the reduced pellets is mainly Ca2Al2SiO7, which has applications in cement materials and glass ceramics.
HIGH TEMPERATURE MATERIALS AND PROCESSES
(2022)
Article
Mining & Mineral Processing
Huibin Li, D. J. Pinson, P. Zulli, L. Lu, R. J. Longbottom, S. J. Chew, B. J. Monaghan, G. Zhang
Summary: Channel iron deposits (CID) are a significant iron ore resource in Western Australia, and this study compared the complex mineral phases in CID goethitic ore with traditional hematite ore. The changes of goethitic ore when heated to different temperatures were investigated, revealing temperature-induced phase transformations and colour changes.
MINERAL PROCESSING AND EXTRACTIVE METALLURGY-TRANSACTIONS OF THE INSTITUTIONS OF MINING AND METALLURGY
(2022)
Article
Engineering, Petroleum
Yanan Hou, Yan Peng, Zhangxin Chen, Yishan Liu, Guangqing Zhang, Zhixiao Ma, Weibing Tian
Summary: This paper focuses on the pressure wave propagation behavior in fracturing fluids, revealing the impact of resonance phenomenon on pressure wave propagation and discussing factors such as frequency, injection mode, injection position, and friction.
