Article
Materials Science, Multidisciplinary
Xudong Mao, Pritesh Garg, Xiaojun Hu, Yuan Li, Samik Nag, Saurabh Kundu, Jianliang Zhang
Summary: Isothermal reduction of iron ore powder with hydrogen/carbon monoxide gas mixture can be divided into two series of steps. The reduction rate is influenced by hydrogen partial pressure and is higher with pure hydrogen compared to pure carbon monoxide. Hydrogen promotes carbon deposition and increases the apparent activation energy with increasing hydrogen content.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Thermodynamics
Bei Li, Gang Liu, Weili Sun, Lili Ye, Mingshu Bi, Wei Gao
Summary: The combustion characteristics, functional groups, and kinetic behavior of coal gangue (CG) and raw coal (RC) were investigated using TG/FTIR techniques. Results showed that CG contained more aliphatic hydrocarbons and naphthenic bands than RC, leading to the production of more gaseous products after 400 degrees C. Three decomposition stages for both samples were identified based on characteristic temperatures obtained from TG data.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Engineering, Chemical
Wei Zhou, Wanghao Xia, Liangliang Liu, Liansheng Li, Qiuyu Zeng, Shujie Wang, Jinbo Zhu
Summary: This paper investigates the key technologies of underground gangue photoelectric separation, including gangue identification, jet nozzle separation, and process layout. The XAFS method is used to identify the differences in microscopic crystal properties of coal gangue, and numerical simulations are conducted to optimize the nozzle morphology and parameters. Multiple layout schemes for gangue photoelectric separation systems are proposed based on the development and mining system of a specific coal mine.
Article
Chemistry, Physical
Gang Cheng, Zehua Cai, Xinjie Song, Xun Chen, Wenxin Dai, Xianzhi Fu
Summary: Under a photo-thermal synergistic effect, metastable NiCo2O4 exhibited higher catalytic activity and oxygen vacancies promoted the interaction and reaction between CO and NO. Visible light irradiation further enhanced the catalytic reaction.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Review
Engineering, Chemical
Jialin Song, Ziliang Wang, Xingxing Cheng, Xiuping Wang
Summary: This study reviews the state-of-art catalysts for NO reduction during coal combustion and discusses key steps in NO removal by CO, CH4, and H-2, as well as future prospects for improving catalyst performance.
Article
Energy & Fuels
Yuanbo Zhang, Yutao Zhang, Xueqiang Shi, Yaqing Li, Xiaodi Zhang
Summary: The co-spontaneous combustion process of coal and gangue is dominated by promotion, and the danger of spontaneous combustion is higher when both coexist.
Article
Chemistry, Physical
Lei Zhong, Wenhao Pan, Zhikai Shi, Chengwei Mao, Jiayao Peng, Jianlin Huang
Summary: This study reports the preparation of nickel-single-atom catalysts anchored on hollow nitrogen-doped porous carbon spheres (HNCS) for highly efficient CO2 reduction. The obtained catalyst exhibits excellent activity, selectivity, and stability, achieving high Faradaic efficiency and partial current density in the electrocatalytic CO2-to-CO conversion.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Environmental Sciences
Yingbo Dong, Huan Lu, Hai Lin
Summary: This study investigated the effects of HS-CG particle size, leaching solution pH, Fe3+ and acidophilic microorganisms on the release of HMs. The results showed that smaller particle size and more acidic solution resulted in higher release of HMs. The addition of Fe3+ as a catalyst enhanced the release of HMs, but high concentrations of Fe3+ decreased the release.
ENVIRONMENTAL RESEARCH
(2023)
Article
Computer Science, Information Systems
Yongcun Guo, Xinquan Wang, Shuang Wang, Kun Hu, Wenshan Wang
Summary: This study proposes a coal and gangue recognition method based on dielectric characteristics, achieving 100% recognition accuracy through improved denoising techniques and the application of support vector machine. The method demonstrates feasibility and efficiency in identifying coal and gangue.
Article
Engineering, Chemical
Jiahao Cheng, Zhihao Wang, Xingxing Cheng, Zhiqiang Wang, Xuetao Wang
Summary: This study proposes a NOx adsorption-enclosed regeneration process (NAER) utilizing rotary reactors to remove NOx from flue gas at ultra-low temperatures. The results show that metal-doped activated carbon is the optimal catalyst for reducing the cooling temperature difference. The novel enclosed high-concentration CO reduction regeneration process promotes the deep decomposition of nitrate and prevents the overflow of NOx.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Energy & Fuels
Huanran Wang, Xianchun Li, Mingming Zhu, Zhezi Zhang, Junzhi Wu, Dongke Zhang
Summary: The study found that increasing Fe-0 dispersion can improve catalytic activity in the presence of CO, while increasing Fe loading is more important in the absence of CO. Catalyst deactivation is mainly attributed to NO oxidation of Fe-0 and activated carbon support, as well as Fe sintering and agglomeration.
Article
Energy & Fuels
Hongyu Zhao, Yanli Chen, Xuqin Duan
Summary: Efficient utilization of coal gangue (CG) is essential for the sustainable development of the coal industry. Through deep reduction experiments, it was found that CG has a self-reduction effect and the addition of other reducing agents can improve the iron grade. Moreover, the addition of CaCO3 can promote the reduction condition of iron minerals.
Article
Green & Sustainable Science & Technology
Yingliang Zhao, Jingping Qiu, Zhengyu Ma, Xiaogang Sun
Summary: The wet-grinding treatment significantly modifies the structure of coal gangue, increasing its reactivity as SCMs. Using wet-ground coal gangue as SCMs accelerates the setting and compressive strength development of the composite materials, with lower porosity in the matrix. The compressive strength of CG/OPC composites can increase by around 71% when using CG12 as SCMs.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Construction & Building Technology
Peiyuan Chen, Liheng Zhang, Yonghui Wang, Yi Fang, Feng Zhang, Ying Xu
Summary: The study found that the CGA rate significantly affects the compressive strength and durability of CGA shotcrete, while the water/binder ratio (w/b) affects the total porosity. A CGA rate of 71% can greatly reduce electric flux and decrease the total porosity of CGA shotcrete.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Thermodynamics
Hanlin Zhang, Yixiang Shu, Shuangling Yue, Yongqiang Chen, Hrvoje Mikulcic, Zia ur Rahman, Houzhang Tan, Xuebin Wang
Summary: In this paper, a novel coal gangue disposal technology is proposed, which includes high temperature preheating pyrolysis and char combustion stages. A 300,000 tons/year demonstration project has been established. Thermogravimetric analysis was used to study the weight loss characteristics and kinetic analysis of ultra-low calorific value coal gangue in this process, compared with normal calorific value coal gangue. The results showed that the equipment has advantages and stability for disposing of ultra-low calorific value coal gangue, with an average removal rate of combustible components reaching 88.47%.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Cheng-ming Fuyang, Jin-yan Chen, Bing Shao, Yang Zhou, Jian-ming Gong, Xiao-feng Guo, Yong Jiang
Summary: The phase transformation and microstructural evolution of HP40Nb alloy at various temperatures and times were investigated. Experimental results showed that carbides transformed at different temperatures and dissolved gradually during aging process. The mechanical properties of the alloy changed with aging treatment, with an increase in tensile strength and micro-hardness but a decrease in elongation and impact toughness.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Materials Science, Multidisciplinary
Chengming Fuyang, Yang Zhou, Bing Shao, Tianyu Zhang, Xiaofeng Guo, Jianming Gong, Xiaowei Wang
Summary: The study investigated the microstructures and tensile properties of fresh and aged reformer furnace tubes, as well as a fresh-to-aged welded joint. The experimental results showed the transformation of carbides and reduction in secondary carbides after aging treatment. The assessment of the welded joint confirmed its weldability, with no microdefects observed and tensile properties close to the original alloy. Stress redistribution during creep process and peak damage location were also simulated, with the maximum damage reaching 34.01% at a certain time.
Article
Thermodynamics
Zhiqiang Guo, XiaoFeng Guo, Qian Yang, Wei Dong
Summary: The study conducted numerical investigations on the flow and heat transfer characteristics of unexpanded jet impingement in piccolo hot air anti-icing chambers of aircraft. It was found that under a small dimensionless impinging distance, the impinging air cannot be fully expanded, resulting in ineffective heating of the surface. Additionally, ambient temperature was identified as a significant factor influencing jet impinging heat transfer.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Hong Wei, Xiaofeng Guo, Zhida Li, Xuesen Yang, Zhongfu Tang, Chao Fu, Wei Dong
Summary: The pre-cooler of a hypersonic combined precooling cycle aero-engine utilizes ultra-low temperature coolant to precool incoming air, but faces issues of frost layer formation affecting performance. Experimental studies on microtubule precoolers under different humidity conditions are necessary. Results show that increasing freestream humidity leads to decreased heat transfer rates of the pre-cooler. Optimal mass ratios of anhydrous methanol for defrosting are found to be between 1.0 and 1.2.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Hong Wei, Zhida Li, Xiaofeng Guo, Xuesen Yang, Wei Dong
Summary: This study aims to investigate the influence of airflow velocity on the frosting and defrosting performance of a compact precooler under actual air humidity conditions. The experimental results show that frosting has an adverse effect on the performance of the precooler, while defrosting improves the performance. The optimal defrosting performance is achieved when the mass ratio of methanol is approximately 1.1.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Multidisciplinary
Xiao-feng Guo, Ning-ning Nan, Ben-xin Liu, Cheng-ming Fuyang, Jian-ming Gong, Hui-ling Jia, Xin Tan
Summary: In this study, an improved creep damage constitutive model based on the hyperbolic sine function is established, and it is calibrated and validated to reflect the creep behavior of stainless steel at high temperatures. The results show that some creep damage limits in the current ASME-NH code may not be conservative.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2022)
Article
Energy & Fuels
Hong Wei, Wei Dong, Xuesen Yang, Xiaofeng Guo, Zhida Li, Zhongfu Tang, Chao Fu
Summary: The compact heat exchanger is critical in the air-breathing combined precooling cycle engine of hypersonic aircraft, but it is prone to frosting, which decreases engine performance. Experimental results show that spraying anhydrous methanol or anhydrous ethanol significantly improves defrosting effectiveness and heat transfer rates.
Article
Energy & Fuels
Chuanyu Zhang, Xiaofeng Guo, Laurent Royon, Patrice Chatellier
Summary: Wastewater from urban areas contains a significant amount of thermal energy, which exchanges with its surrounding environment. This study analyzes the thermal exchanges between wastewater and its immediate environment. A mathematical model is constructed to predict the water level and velocity in the sewer, allowing the calculation of heat transfer between the wastewater and surrounding soil. The results reveal the influence of wastewater on soil temperature within a certain distance and emphasize the potential of using the sewer network as an underground thermal storage system to improve urban energy efficiency.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Mechanics
Xiangshu Lei, Yingwen Liu, Peng Yang, Laurent Royon, Xiaofeng Guo
Summary: A theoretical model is established to study the physics of droplet dynamics on a vertical surface driven by vibration. Experimental and theoretical results show that the phase shift between droplet and plate reaches its peak at a lower frequency for larger droplets. Based on this phase shift mechanism, a strategy for promoting droplet coalescence is proposed. An optimal frequency and a large-bandwidth frequency range are identified for achieving maximum phase shift and successful droplet coalescence. These findings are significant for the application of vibrating surfaces in droplet removal.
Article
Optics
Daoming You, Manqing Tan, Xiaofeng Guo, Wentao Guo, Yingchun Cao, Wenbin Chen
Summary: In this study, the reflection index of superluminescent diodes (SLDs) is optimized by designing and fabricating antireflective (AR) films. The double-layer AR film, prepared by reactive magnetron sputtering, effectively reduces the ripple index and modulation index of SLDs. The optimized SLD chips maintain a high output power of 10 mW under a current of 100 mA.
CHINESE JOURNAL OF LASERS-ZHONGGUO JIGUANG
(2023)
Article
Physics, Fluids & Plasmas
Geyu Zhong, Yingwen Liu, Xiaofeng Guo, Laurent Royon, Philippe Brunet
Summary: In this paper, the flow structure generated by low-frequency forcing around a sharp tip is studied using direct numerical simulations. The periodic and steady responses are extracted within a large span of amplitude of vibrations. When the amplitude is smaller than the tip radius of curvature, the flow structure is similar to that observed at higher frequencies, with an intense central jet and a quadratic dependence for the streaming velocity with the oscillating velocity. At higher amplitudes, this scaling no longer holds and the streaming flow pattern loses its left-right symmetry. The mechanisms of the instability are analyzed from the careful examination of the instationary flow fields, and possible mechanisms involving the coupling between the streaming jet and instationary vorticity are proposed.
Article
Thermodynamics
Geyu Zhong, Chuanyu Zhang, Xiaofeng Guo, Peng Yang, Yingwen Liu
Summary: This research focuses on the formation and transmission process of oscillatory vortices in oscillatory flow driven by the periodical reverse of flow orientation. It explores the spatial-temporal relationships between fluid dynamics and energy transmission, providing insights into the underlying mechanisms of heat transfer enhancement in oscillating flow.
ASME JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Review
Chemistry, Multidisciplinary
Hang Yin, Zhi Li, Xiaofeng Guo, Anchao Feng, Liqun Zhang, San Hoa Thang
Summary: This article introduces the selection principles of RAFT chain transfer agents and the principle and application conditions of a universal RAFT chain transfer agent in RAFT polymerization. The latest developments and applications of block copolymers with MAMs and LAMs based on the universal RAFT agents are discussed in depth.
PROGRESS IN CHEMISTRY
(2022)
Proceedings Paper
Automation & Control Systems
Hung-Jui Huang, Xiaofeng Guo, Wenzhen Yuan
Summary: This paper investigates dynamic tactile sensing for estimating liquid properties. A data-driven model based on simplified physical principles is proposed, and experiments show its accuracy and generality. The model can classify different liquids accurately and estimate volume and concentration with high precision.
ROBOTICS: SCIENCE AND SYSTEM XVIII
(2022)
Article
Polymer Science
Wencheng Shi, Boyu Wu, Xiaofeng Guo, Anchao Feng, San H. Thang
Summary: Fluorescent end-functional mikto-arm star copolymers were synthesized using a novel method and the linear correlation between fluorescence intensity and polymer concentration was verified. This method enables the quantitative analysis of the arm components of star polymers, providing a new approach for the characterization of star polymers.
Correction
Chemistry, Applied
Jia Liu, Juntong Dong, Xiaodan Li, Teng Xu, Zhenguo Li, Jeffrey Dankwa Ampah, Mubasher Ikram, Shihai Zhang, Chao Jin, Zhenlong Geng, Tianyun Sun, Haifeng Liu
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Seba Alareeqi, Daniel Bahamon, Kyriaki Polychronopoulou, Lourdes F. Vega
Summary: This study explores the potential application of single-atom-alloy (SAA) catalysts in bio-oils hydrodeoxygenation refining using density functional theory (DFT) and microkinetic modeling. It establishes the relationships between stability, adsorptive properties, and activity structures for bio-oil derivatives, providing guidance for the synthesis of cost-effective SAA combinations.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Bin Hu, Wen -Ming Zhang, Xue-Wen Guo, Ji Liu, Xiao Yang, Qiang Lu
Summary: This study explored the pyrolysis behaviors and mechanisms of different monosaccharides, including arabinose, galactose, galacturonic acid, and glucuronic acid. The roles of structural differences in these monosaccharides were analyzed, and it was found that glucuronic acid undergoes a special C-C bond breaking reaction during pyrolysis. The findings provide a deep understanding of the pyrolysis chemistry of hemicellulose and the role of different branches.
FUEL PROCESSING TECHNOLOGY
(2024)
Review
Chemistry, Applied
Youwei Zhi, Donghai Xu, Guanyu Jiang, Wanpeng Yang, Zhilin Chen, Peigao Duan, Jie Zhang
Summary: Hydrothermal carbonization (HTC) is an effective method for the harmless disposal of municipal sludge (MS) and offers potential applications for the obtained products. Optimizing reaction conditions, coupling with other waste materials, and combining different processes can improve the performance of HTC. Furthermore, HTC contributes to energy recovery and enhances the quality of life cycle assessment.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Jia Wang, Jianchun Jiang, Dongxian Li, Xianzhi Meng, Arthur J. Ragauskas
Summary: This study presents a scalable process for converting holocellulose and cellulosic wastes into advanced oxygen-containing biofuels with high furan, cyclic ketone, and ethanol content. By combining hydropyrolysis and vapor-phase hydrodeoxygenation using Pd/Al2O3 as a catalyst, the researchers achieved high yields and conversions. The integrated process holds great promise for biomass waste conversion into advanced biofuels.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Florian Held, Jannis Reusch, Steffen Salenbauch, Christian Hasse
Summary: The accurate prediction and assessment of soot emissions in internal combustion engines are crucial for the development of sustainable powertrains. This study presents a detailed quadrature-based method of moments (QMOM) soot model coupled with a state-of-the-art flow solver for the simulation of gasoline engines. The model accurately describes the entire cause-and-effect chain of soot formation, growth and oxidation. Experimental validation and engine cycle simulations are used to identify the root cause of observed soot formation hotspots.
FUEL PROCESSING TECHNOLOGY
(2024)