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4th International Conference on Mechanical Design and Simulation, MDS 2024

作者： Ge, Jingxu Huo, Chaoxia Wang, Lin Zheng, Jin Li, Guojun Key Laboratory of Thermal Fluid Science and Engineering of MOE Faculty of Energy and Power Engineering Xi’an Jiaotong University 28 Xianning West Road Shaanxi Xi’an China Xi’an Thermal Power Research Institute Co. Ltd Shaanxi Xi’an China

ISBN: (纸本)9789819778867

The stirred media mill with pin-type rotor structure is one of the important equipment for manufacturing superfine powder. The CFD-DEM method is used to simulate the solid and liquid flow in the stirred mill. The velocity, collision and energy in the grinding chamber were analysed. The results show that the velocity gradient near the wall of the cylinder and agitator is large, and the velocity gradient near the cover plate on both sides is small, and the distribution of solid particles with high velocity in the grinding chamber is small;the particle distribution in the grinding cavity is not uniform, showing a tendency to pile up to the cover plate on both sides;the total energy per particle in the area near the agitator is much higher than that of the cover plate area on both sides, and the area near the agitator is the effective grinding area. © The Author(s) 2025.

关键词： Multiphase flow

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Variations in Rural PM2.5 Sources and Composition in the Post Coal-to-Gas Period Based on a Three-Year Observation

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Aerosol and Air Quality Research 2025年第1期25卷 1-13页

作者： Ning, Zhi Li, Zhiyong Wei, Jihong Liu, Jinming Ma, Huichun Ren, Zhuangzhuang Ma, Xiaohua Liu, Chen Chen, Lan Liu, Aiqin Wang, Binglin Wang, Jiaqi Gao, Huiying Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science and Engineering North China Electric Power University Baoding071003 China MOE Key Laboratory of Resources and Environmental Systems Optimization College of Environmental Science and Engineering North China Electric Power University Beijing102206 China Department of Pediatrics Affiliated Hospital of Hebei University Baoding071000 China Hebei Key Lab of Mineral Resources and Ecological Environment Monitoring Hebei Research Center for Geoanalysis Baoding071051 China School of Control Science and Engineering North China Electric Power University Baoding071003 China China Environmental United Certification Center Co. Ltd. Beijing100029 China

Introduction: Various studies were conducted focused on the coal-to-gas (CTG) impacts on urban PM2.5 during its implementation. However, the continuity of CTG effectiveness on PM2.5 control in the post CTG remained unclear, especially in rural area, retarding the further emission-control policy optimization. To address this gap, we examined the wintertime rural PM2.5 variations within the Beijing–Tianjin–Hebei during the non-epidemic-lockdown period of winter 2020–2022. Of which, 2020 holds the most stringent CTG enforcement, 2021 marks the conclusion of CTG, and 2022 represents the post CTG. Methods: In this study, the PM2.5 levels in rural areas of the Beijing–Tianjin–Hebei region were monitored during the winters of 2020, 2021, and 2022. Meanwhile, multiple chemical analysis methods were employed to determine its chemical components. The Positive Matrix Factorization (PMF) modeling and Potential source contribution function (PSCF) analysis were employed to analyze the contributions of different sources to PM2.5. Results and Discussion: PM2.5 exhibited an average decrease of 30.4%, and PMF modeling indicated the contributions of coal combustion (CC) to PM2.5 fell from 22.4% in 2020 to 17.8% in 2021, and further to 10.8% by 2022, highlighting the enduring CTG effectiveness. The continuously decreasing CC-specific As, Pb, and SO42– was another evidence for scattered coal prohibition. Reluctantly, the biomass burning (BB) contributions held higher increase of 17.2% in 2021–2022 than 8.86% in 2020–2021, and it has leapt to be the largest PM2.5 contributor (25.4%) in winter 2022. The natural gas shortage and subsidy reduction in winter 2022, as well as the man, and forced demolition of coal-stoves in winter 2022 should be the main inducements. Contrary to the recent upward trend of secondary aerosols, SO42–, NO3–, and NH4+ showed a downward trend, with annual average dropped of 52.6%, 23.4%, and 53.8%, respectively. This should be ascribed to the enhanced primary emiss

关键词： Coal

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Facile construction of N-doped TiO2 nanohybrids with enriched oxygen vacancies for enhanced photocatalytic green hydrogen production

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Ceramics International 2025年

作者： Tao, Zichen Zhang, Bin Chen, Wenxin Cao, Ruwen Liu, Jie Wang, Lidong Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science and Engineering North China Electric Power University Baoding071003 China MOE Key Laboratory of Resources and Environmental Systems Optimization College of Environmental Science and Engineering North China Electric Power University Beijing102206 China

A series of N-doped TiO2 nanohybrids (xN-TiO2) were successfully prepared via a facile solvothermal route by using oleylamine as N source, for enhancing photocatalytic hydrogen evolution reaction (HER). The doped-N atoms induced the generation of abundant oxygen vacancies (OVs). The resulted impurity and defect levels in xN-TiO2 contributed to their narrowed band gap, enhanced visible light response, and promoted separation and transfer of photogenerated carrier. Moreover, the N-doping optimized the distribution of OVs, and therefore affect the conduction band (CB) location of catalyst. Herein, the 3N-TiO2 catalyst with excellent photoelectric properties and appropriate CB location, showed the photocatalytic HER rate of 3984.71 μmol h−1 g−1 under the simulated sunlight irradiation, which was 5.5 and 29.0 times that of the undoped TiO2 and commercial P25, respectively. Meanwhile, the 3N-TiO2 catalyst exhibited the excellent stability and salt-resistance. This work provides a novel insight for the band alignment of photocatalysts by defects regulation, and opens the new possibility for synthesizing N-doped TiO2 catalyst by a more practical and safe method. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Hydrogen evolution reaction

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FAU zeolites from coal/rice husk co-combustion ash (co-ash) for CO2 adsorption: Synthesis, characterization, adsorption and regeneration performance

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Separation and Purification Technology 2025年 369卷

作者： Xu, Qing Lu, Jianyi Zhou, Zhiyong Jin, Yujia Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science and Engineering North China Electric Power University Baoding071003 China MOE Key Laboratory of Resources and Environmental Systems Optimization College of Environmental Science and Engineering North China Electric Power University Beijing102206 China

Synthesis of zeolite from industrial wastes has become an important environmental protection strategy. This study explored the synthesis of nano-sized NaX and NaY zeolites from coal/rice husk co-combustion ash (co-ash) using alkali-melting-hydrothermal synthesis and seed guiding methods, followed by modification with Li+ and K+ exchange. NaY zeolite, synthesized at a SiO2/Al2O3 ratio of 5 and crystallization temperature of 100 °C, exhibited the most complete crystal structure and optimal CO2 adsorption capacity. The specific surface area (SSA) of NaX and NaY zeolites (583.0 m2/g and 790.1 m2/g, respectively) are comparable to those of commercial zeolites, emphasizing their structural parity, and demonstrating their potential as effective CO2 adsorbents. NaY demonstrated a CO2 adsorption capacity of 5.31 mmol/g at 298.15 K and 1 bar, competitive with other conventionally synthesized and commercial zeolites. Cation exchange had a minimal impact on CO2 adsorption of NaY, with LiX improving capacity by 11.65 % compared to NaX, while LiY showed only a 2.94 % increase. K+ exchange negatively affected both zeolites. Kinetic and thermodynamic analyses, using the proposed first-order (PFO) and Langmuir-Freundlich models, indicated that CO2 adsorption is a rapid physisorption process with thermal effects ranging from 22 to 41 kJ/mol. Both zeolites exhibited excellent CO2/N2 selectivity and regeneration stability, with the loss of adsorption capacity retaining only 10.57 % and 9.63 % for NaX and NaY after fifteen cycles. This highlights their potential as efficient CO2 adsorbents. © 2025 Elsevier B.V.

关键词： Coal combustion

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Double cations modified clinoptilolite enhancing the adsorption separation of CH4 and N2

Gas Science and Engineering

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Gas science and engineering 2025年 138卷

作者： Liu, Xiangyang Wang, Peiji Huang, Shaoxuan Wang, Daquan Afzal, Waheed He, Maogang Key Laboratory of Thermal Fluid Science and Engineering of MOE School of Energy and Power Engineering Xi'an Jiaotong University Shaanxi Xi'an710049 China School of Chemistry Xi'an Jiaotong University Shaanxi Xi'an710049 China School of Engineering University of Aberdeen Scotland AberdeenAB24 3UE United Kingdom

Coal bed methane is an important supplement to natural gas, but its application is constrained by low CH4 concentration. Zeolite is most promising adsorbent for coal bed methane purification, its adsorption and separation performance still need to be further improved. In terms of this issue, we successfully synthesized a Na+ and Ag+ double cations modified clinoptilolite inspired by that Na + had an enhancing effect on N2 adsorption capacity of clinoptilolite, while Ag + had a negative effect on CH4 adsorption capacity. The elemental composition and morphology of the cation exchanged clinoptilolite were characterized by SEM, EDS, XRD and BET method. Adsorption capacity of CH4 and N2 were measured by saturation method and isothermal adsorption lines were plotted using the Langmuir-Freundlich model. The results show that the double cations modification can bring both the modification effect of two cations, in which Na + improves N2 adsorption and Ag + reduces CH4 adsorption. It leads to a great improvement in the separation performance of clinoptilolite. The N2/CH4 adsorption selectivity and the N2 adsorption capacity of the cation exchanged clinoptilolite reaches 9.17 and 0.33 mmol/g at 0.1 MPa, respectively. We successfully combined the modifying effects of Na+ and Ag+ on clinoptilolite, resulting in better gas separation performance compared to a single cation-modified clinoptilolite. © 2025 Elsevier B.V.

关键词： Gas adsorption

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Unintended side effect of the coal-to-gas policy in North China Plain: Migration of the sources and health risks of ambient PAHs

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science of the Total Environment 2025年 958卷 178050页

作者： Li, Zhiyong Liu, Chen Ren, Zhuangzhuang Liu, Jinming Ma, Xiaohua Ning, Zhi Meng, Jianwei Liu, Aiqin Ma, Huichun Wang, Lei Chen, Lan Wang, Hao Kong, Shaofei Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control Department of Environmental Science and Engineering North China Electric Power University Baoding071003 China MOE Key Laboratory of Resources and Environmental Systems Optimization College of Environmental Science and Engineering North China Electric Power University Beijing102206 China Hebei Key Lab of Mineral Resources and Ecological Environment Monitoring Hebei Research Center for Geoanalysis Baoding071051 China Department of Atmospheric Sciences School of Environmental Sciences China University of Geosciences Wuhan430074 China

Ongoing coal-to-gas (CTG) largely cut down both coal consumption and associated PM2.5. However, a knowledge gap still existed in CTG impacts on the other energy and organic pollutant emissions. Coupling on-site investigation with statistical yearbooks, we provided a more realistic energy evolutions before (BCTG), during (DCTG), and after (ACTG) the CTG for Hebei Province. Together, we examined the impacts of CTG derived energy conversion on PM2.5-bound PAHs at urban (UA)/suburban rural (SRA)/remote rural (RRA) sites in winter 2022. As expected, the consumptions of coal and natural gas (NG) far decreased and increased from BCTG to ACTG, respectively. Accidentally, biomass usage rose by 60.7%, and rural CTG acted as a main driver. Specially, SRA's NG-shortage and coal-stove demolition should be the main inducements, and RRA's coal-sale ban was another trigger in the early stage of CTG. ∑18PAHs and ∑8TPAHs stand for the sum of 18 PAHs and 8 toxic PAHs, respectively. ∑18PAHs (ng/m3) presented as SRA (81.8) > RRA (46.4) > UA (19.4). Biomass burning (BB) and NG combustion (NGC) contributed most to∑18PAHs of 31.0% and 23.1% at SRA, resulting in the highest ∑18PAHs, ∑18PAHs/PM2.5, and ∑8TPAHs/PM2.5, and incremental lifetime cancer risk values. Also, NGC has become the second largest contributor at UA. Variations in both diagnostic ratios and source-depend isomers further proved the prominence of NGC related PAHs at UA vs. SRA. Notably, RRA was least affected by the CTG, coal combustion (CC, 40.4%) and BB (32.6%) still occupied the top positions. In short, CTG gave rise to an upsurge in biomass usage, and the incremental PAHs emissions from BB vs. NGC. This study underlined that the priorities should be given to rural NG guarantee and subsidy retention, and biomass prohibition for further air quality improvement. © 2024 Elsevier B.V.

关键词： Coal

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Corrigendum to “Constraint-incorporated deep learning model for predicting heat transfer in porous media under diverse external heat fluxes” [Energy and AI 18 (2024) 100425]

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Energy and AI 2025年 19卷

作者： Ziling Guo Hui Wang Huangyi Zhu Zhiguo Qu MOE Key Laboratory of Thermal-Fluid Science and Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China

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A review of corrosion and protection of alloys in supercritical carbon dioxide power cycles: from the perspectives of corrosion simulation, dynamic simulation to experimental research

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The Journal of Supercritical Fluids 2025年

作者： Zhiyuan Liang Tingshan Guo Qinxin Zhao Key Laboratory of Thermal Fluid Science and Engineering of MOE School of Energy and Power Engineering Xi’an Jiaotong University Xi’an 710049 PR China

The carburization and corrosion resistance of heat-resistant materials are crucial for enhancing the safety of supercritical CO 2 renewable energy power system. Addressing the compatibility issues between heat-resistant materials and supercritical CO 2 , this review focuses on material selection, corrosion failure mechanisms, and surface strengthening methods, encompassing both experimental characterization and simulation calculations. The corrosion resistance of heat-resistant materials is predominantly governed by their intrinsic properties, particularly the Cr content. Stress loading aggravates the ion diffusion and carburization rates of heat-resistant materials. Although impurity gases accelerate corrosion rates, temperature remains the primary factor controlling ionic diffusion kinetics. Pre-forming protective oxide layers through surface modification can significantly enhance corrosion resistance. The continuous and dense Cr 2 O 3 , Al 2 O 3 and SiO 2 oxide films hinder the ion diffusion and significantly reduce the carburization and corrosion rates of heat-resistant materials. However, corrosion testing alone provides limited mechanistic insights, whereas computational simulations offer valuable understanding of gas adsorption and initial oxidation behavior in these materials. Machine learning can reduce the influence of test equipment, environment, and operation, improving the systematic and universal applicability of high-temperature corrosion test results. Future research should focus on conducting experiments and simulations of high-temperature corrosion and corrosion fatigue under variable supercritical CO 2 load conditions.

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Renewable production of nylon precursors from lignin

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Cell Reports Sustainability 2025年第3期2卷

作者： Li, Kaile Yu, Shijie Radu, Alexandra Xu, Yongqing Saad, Juniza Md Mohamed, Badr A. Li, Qinghai Zhang, Yanguo Luo, Zhicheng Zhou, Hui Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Beijing Key Laboratory of CO2 Utilization and Reduction Technology Department of Energy and Power Engineering Tsinghua University Beijing 100084 China Department of Science and Technology Universiti Putra Malaysia Bintulu Sarawak Campus Sarawak Bintulu 97008 Malaysia Department of Agricultural Engineering Cairo University Giza Egypt Shanxi Research Institute for Clean Energy Tsinghua University Shanxi Taiyuan 030000 China MOE Key Laboratory of Energy Thermal Conversion & Control School of Energy and Environment Southeast University Nanjing 210096 China Laboratory of Inorganic Materials and Catalysis Department of Chemical Engineering and Chemistry Eindhoven University of Technology Eindhoven Netherlands

Cyclohexanone and cyclohexanol are critical monomeric precursors in the production of nylon 6 and nylon 66, which are conventionally sourced from petroleum. To reduce the reliance on fossil resources and embrace green chemistry, there is a need to shift to more sustainable feedstocks such as lignin, an abundant aromatic biopolymer. To convert lignin-derived monomers obtained by deconstruction of the polymer into nylon precursors, a selective hydrodeoxygenation (SHDO) step, i.e., demethoxylation and dearomatization, toward cyclohexanone and cyclohexanol needs to be carried out. However, catalytic processes required for this transition, spanning catalyst activity, stability, and product selectivity, remain uncertain. This review delves into recent strides with metal-based catalysts (e.g., ruthenium [Ru], nickel [Ni], and cobalt [Co]) on diverse supports (e.g., metal oxides and carbon materials), exploring reaction conditions (solvent, temperature, and H₂ pressure) and proposed mechanisms. It concludes by outlining catalyst challenges and future perspectives for the SHDO reaction, paving the way for sustainable nylon precursor synthesis from lignin. © 2025 The Authors

关键词： guaiacol lignin metal-based catalysts nylon precursor selective hydrodeoxygenation

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Tuning the Molecular Structure and Transport Property of[bmim][Tf_(2)N]Using Electric Field

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Journal of thermal science 2022年第4期31卷 1076-1083页

作者： WANG Tao LIU Xiangyang XUE Sa LIU Hui HE Maogang Key Laboratory of Thermal Fluid Science and Engineeringof MOE School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049China

In this work,the effects of electric field on the microstructure and transport property of[bmim][Tf_(2)N]were simulated by molecular dynamics method to provide regulating strategy of required ionic *** simulation results showed that[bmim]^(+) and [Tf_(2)N]^(–)move slowly along the positive and negative direction of the electric field,respectively,and anions and cations are still arranging alternatively under weak electric field which has slight influence on the electrostatic force in[bmim][Tf_(2)N].When the electric field is strong,it has significant influence on the electrostatic force of[bmim][Tf_(2)N],which results the aggregation of[bmim]^(+) and [Tf_(2)N]^(–) and the appearance of large hole inside[bmim][Tf_(2)N].In addition,with the increase of electric field intensity,the density of[bmim][Tf_(2)N] increases,which means the free volume inside[bmim][Tf_(2)N]become ***,the thermal conductivity and viscosity exhibit anisotropy.

关键词： ionic liquid molecular structure transport property electric field

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