Article
Green & Sustainable Science & Technology
Bingru Lu, Bin Bai, Ruiheng Zhang, Jingnan Ma, Liuhao Mao, Jinwen Shi, Hui Jin
Summary: This study conducted experiments on the behavior of polyoxymethylene (POM) plastics in supercritical water gasification (SCWG). The effects of temperature, residence time, feedstocks concentration, and pressure on the gasification reaction were investigated, and the optimum conditions for POM plastics gasification were determined. It was found that increasing temperature significantly improved the gasification efficiency, while increasing concentration reduced the gasification rate. Under the optimal conditions, the carbon gasification efficiency reached 97.15%.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Thermodynamics
Jingwei Chen, Liangyu Fu, Ming Tian, Siyi Kang, Jiaqiang E
Summary: This paper investigates the supercritical water gasification (SCWG) characteristics of waste thermoplastic plastics and a mixed plastic. The effects of reaction temperature, reaction time, and mass concentration on gasification characteristics are explored, and the optimal conditions are obtained. The results show that the reaction temperature has the most significant positive effect on the SCWG of different plastics. The study also highlights the higher efficiency of SCWG for mixed plastic due to the synergistic effect of different plastic composition.
Article
Chemistry, Physical
Weizuo Wang, Bin Bai, Wenwen Wei, Changqing Cao, Hui Jin
Summary: This study investigated the conversion characteristics of urea-formaldehyde (UF) plastics using supercritical water, analyzing the impact of different operating parameters on the gasification process. By comparing with polystyrene (PS) plastics, the properties and inhibition mechanism of thermoset plastics were examined.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
D. A. Buentello-Montoya, C. A. Duarte-Ruiz, J. F. Maldonado-Escalante
Summary: This study simulates the co-gasification of plastics and biomass and finds that increasing the proportion of plastics in the gasification feedstock improves the gas heating value and tar content. PET is the least valuable plastic in the process, and the H2/CO ratio decreases with temperature during the gasification of a mixture of PP/PET/biomass, which is important for the end-use of the syngas.
Article
Thermodynamics
Cui Wang, Linfeng Li, Yunan Chen, Zhiwei Ge, Hui Jin
Summary: In this study, gasification experiments of wheat straw in supercritical water were conducted to analyze the gasification properties. A kinetic model of wheat straw was established to guide the acceleration of gasification. The results showed that increasing reaction time enhanced gasification significantly, while temperature became the limiting factor for hydrogen yield.
Article
Chemistry, Physical
Pai Peng, Shenghui Guo, Linhu Li, Hui Jin, Zhiwei Ge, Liejin Guo
Summary: This study proposes an effective pretreatment method for PCOS and demonstrates that both time and temperature have promoting effects on gas production. Polycyclic aromatic hydrocarbons are considered as significant obstacles during gasification. The results show that high carbon gasification efficiency and maximum hydrogen yield can be achieved under specific conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Applied
Ning Wei, Botian Hao, Donghai Xu, Xu Liu, Mingyan Ma, Yang Guo
Summary: This study investigated the pathways and kinetics of hydrogen production from indole gasification in supercritical water. The addition of an oxidant was found to enhance gasification efficiency and increase the yields of H2 and CO2.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Linhu Li, Xujun Li, Wen Cao
Summary: Supercritical water gasification (SCWG) is a clean technology for disposal and energy recovery of oily sludge. The study investigates the gaseous products of SCWG of oily sludge at different temperatures and residence times, and develops a kinetic model to optimize the production of H2 and CH4. The results show that H2 yield increases with temperature and residence time, while CH4 yield and carbon gasification efficiency peak at 600 degrees C. The liquid products contain alkene, acetone, benzene, toluene, ethyl -benzene, xylene, phenolic substances, and PAHs.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Thermodynamics
Yunan Chen, Lei Yi, Wenwen Wei, Hui Jin, Liejin Guo
Summary: The study on sewage sludge gasification in supercritical water found that temperature is the main factor affecting hydrogen yield, gasification efficiency, carbon gasification efficiency, and hydrogen yield potential. Additionally, the addition of mixed catalysts can promote reactions and the formation of hydrogen.
Article
Engineering, Environmental
Lei Yi, Le Wang, Liejin Guo, Ke Cheng, Hui Jin, Yunan Chen, Wen Cao
Summary: The study utilized supercritical water gasification technology to treat UDMH wastewater, with a spiral continuous reactor showing promising results. The addition of KOH could achieve a carbon gasification efficiency close to 100%, with a maximum hydrogen yield of 21.6 mol/kg under specific conditions.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Chemistry, Physical
Ali Karimi, Negar Kazemi, Omid Tavakoli, Azadeh Ebrahimian Pirbazari
Summary: This study investigated the supercritical water gasification of black liquor for hydrogen production, finding that the hydrogen yield could be enhanced by optimizing temperature and reaction time. The addition of heterogeneous catalysts and other biomass like wood residue and formic acid further improved the hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Hao Zhang, Guang Wang, Jingsong Wang, Qingguo Xue
Summary: A new treatment process for waste plastics involving heat treatment and addition of solid carbon material was proposed. The optimum treatment conditions were found to be a temperature of 723K and a plastic addition ratio of 20%. Gasification reactivity of the products with plastic addition was better than that of coal powder, with three kinetics models used to analyze the gasification process. The findings are expected to be useful for waste plastic treatment.
Review
Thermodynamics
Jingwei Chen, Qiteng Wang, Zhengyong Xu, E. Jiaqiang, Erwei Leng, Feng Zhang, Gaoliang Liao
Summary: Supercritical water gasification of coal is a promising clean coal conversion technology with advantages such as high efficiency and reduced emissions. However, achieving complete gasification at low temperatures remains a challenge, which can be addressed through factors like temperature, oxidant, and catalysts.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Weizuo Wang, Bingru Lu, Jinwen Shi, Qiuyang Zhao, Hui Jin
Summary: A new supercritical water gasification system using supercritical CO2 as medium was established in this paper, with phenolic plastics as the sample transported by CO2. The influence of temperature, pressure, gasification concentration, and transporting concentration on the system was investigated. The system with CO2 transporting was proven to reduce the loss of both energy and exergy, while the decrease in gas production yield was less than 0.1 mol/mol compared to the system with H2O transporting.
JOURNAL OF THERMAL SCIENCE
(2023)
Article
Green & Sustainable Science & Technology
Le Wang, Jia Chen, Jinhua Cui, Gaoyun Wang, Hui Jin, Liejin Guo
Summary: Supercritical water gasification offers an efficient and clean treatment for spent ion exchange resins, with high temperature, low concentration, K2CO3 catalyst addition, and long residence time promoting the gasification result. The carbon gasification efficiency reached 97.2% at 750 degrees C with 10 wt% concentration and K2CO3 catalyst addition. The main organic component residues in the liquid products were identified, and the reaction pathways and distributions of sulfur and nitrogen were discussed.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Chemical
Yingdong Wang, Huibo Wang, Hui Jin
Summary: Supercritical water gasification is an efficient and clean energy conversion method. The study of particle-particle and particle-fluid-particle interactions on the particle scale can guide the understanding of gasification performance on the reactor scale.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Chemical
Bowei Zhang, Xiao Zhao, Yunan Chen, Zhiwei Ge, Hui Jin
Summary: In this study, the diffusion behavior of H2S in the H2S-H2O system was simulated using the molecular dynamics method. The self-diffusion coefficient of H2S was calculated under different conditions (pressure: 235-280 atm, H2S molar concentration: 1-5%, temperature: 600-1173 K). The results showed that the molar concentration and pressure of H2S had little effect on its self-diffusion coefficient, while temperature and water density had a greater effect. Additionally, the self-diffusion activation energy of the supercritical region of H2S was found to be only 32.58% of the subcritical region. Finally, new parameters of an empirical equation were fitted to predict the self-diffusion coefficient of H2S in the H2S-H2O system, with a mean relative error of 3.05% in the supercritical region.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Physical
Jialin Wang, Yu-Cheng Huang, Yiqing Wang, Hao Deng, Yuchuan Shi, Daixing Wei, Mingtao Li, Chung -Li Dong, Hui Jin, Samuel S. Mao, Shaohua Shen
Summary: This study reveals that the d-orbital electronic configuration of nickel in Ni-N-C catalysts promotes CO2 activation and electron transfer, leading to excellent CO2 reduction to CO performance.
Article
Thermodynamics
Yi Li, Fan Liu, Xiaoyu Li, Hui Jin
Summary: This study investigated the natural convection of near critical water in a cylindrical hydrothermal reactor through numerical simulation. It was found that the flow was dominated by a large vortex when the heat flux ratio was lower than 1, and by two independent weak vortices when the ratio was higher than 1. When approaching the pseudocritical point, the flow structure remained unchanged, but wall heat transfer increased and fluid motion weakened. The change in heat flux ratio significantly regulated fluid motion but had a slight effect on wall heat transfer, with a weakened effect in the near critical region.
APPLIED THERMAL ENGINEERING
(2023)
Review
Engineering, Environmental
Jinwen Shi, Xing Kang, Liuhao Mao, Yuzhou Jiang, Shiyu Zhao, Yanbing Liu, Binjiang Zhai, Hui Jin, Liejin Guo
Summary: Supercritical carbon dioxide (SCCO2) has been widely used in green, sustainable and effective technologies due to its fascinating properties. However, the high sensitivity of SCCO2 to parameter changes limits its practical applications. This review focuses on summarizing the current research on SCCO2-applied equipments in the field of chemical engineering, providing thoughts for target design, technical guidance for optimization, and inspiration for developing new applications, aiming to supply a reliable and valuable reference for the development and industrial applications of SCCO2-based technologies.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Pai Peng, Gaoyun Wang, Linhu Li, Hui Ge, Hui Jin, Liejin Guo
Summary: This study investigates the degradation of polymer-containing oily sludge (PCOS) in sub-/supercritical water to find a suitable treatment method. The effects of residence time, temperature, catalysts, and co-solvents on the distribution of end products are studied. Results show that PCOS is hardly gasified under subcritical conditions, while supercritical water has high solubility for PCOS with no solid residues. Organic matter in the liquid phase is classified into nine types, and the increase in temperature greatly changes its composition. The migration of elements (carbon and nitrogen) is also comprehensively studied.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Chemistry, Multidisciplinary
Hanbing Li, Hongyan Zhang, Wenquan Liu, Jie Huang, Kejian Lu, Jinwen Shi, Hui Jin, Wenshuai Chen, Maochang Liu
Summary: In recent years, solar-powered photocatalytic water splitting for hydrogen production has gained significant attention as a renewable and environmentally friendly method to generate clean energy. This paper explores the process of photocatalytic hydrogen evolution using Pt-loaded commercial titanium dioxide as the photocatalyst and presents a simple experimental demonstration of integrating photocatalytic hydrogen production with a hydrogen fuel cell system. The principles, reaction mechanisms, and experimental design linking photocatalysis with fuel cells are systematically discussed.
JOURNAL OF CHEMICAL EDUCATION
(2023)
Article
Green & Sustainable Science & Technology
Bin Bai, Peng Liu, Hui Jin
Summary: This study investigates the settlement of plastic particles in hydrothermal conditions. The experimental results show that the particles undergo a swelling stage and increase in size by absorbing the fluid under hydrothermal conditions. The falling trajectory of particles displays an irregular spatial curve, and the eccentric position of the particles during settlement also affects their size. The drag coefficient of swelling particles in the tube is significantly larger than that of rigid particles, and it gradually decreases with the Reynolds number, especially for small particles.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Mechanics
Peitong Li, Huibo Wang, Xiaoyu Li, Liejin Guo, Hui Jin
Summary: This paper aims to find a convenient method to calculate the friction coefficient on a flat plate in supercritical water (SCW) laminar flow using a pseudo-critical incoming state. Direct numerical simulation (DNS) is used to study the velocity profile characteristics in the SCW boundary layer and apply them to derive a semi-analytical formula for plate friction in the SCW fluid field. The method of obtaining a dimensionless parameter G(mu)* by DNS is given, and the dependence between G(mu)* and boundary conditions is derived by numerical experiments. The accuracy of this method is proved by comparing the results with DNS results.
Article
Mechanics
Kun Jiang, Qiuyang Zhao, Haocheng Yu, Jinwen Shi, Hui Jin
Summary: In this study, particle resolve-direct numerical simulation is used to investigate the flow of high-temperature supercritical CO2 over a low-temperature stationary sphere. It is found that the presence of Stefan flow reduces flow resistance but inhibits heat transfer performance compared to cases without Stefan flow.
Editorial Material
Chemistry, Multidisciplinary
Hui Jin, Qingang Xiong, Xiaolei Zhang, Yaning Zhang
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Engineering, Chemical
Qiuyang Zhao, Baercheng Bawaa, Tian Xie, Yu Dong, Weizuo Wang, Hui Jin, Liejin Guo
Summary: The study investigates the hydrocarbon generation characteristics of pure kerogen in supercritical water by removing inorganic minerals using acid-pickling. Results show that increasing temperature favors high-quality oil production with more light distillates, while gas yield continues to increase. The main gas products are methane, hydrogen, carbon dioxide, and C2+ hydrocarbons, with hydrogen proportion increasing with temperature and methane proportion peaking at 600 degrees C. Elevated temperatures in a supercritical water atmosphere lead to ring-opening processes and the cleavage of branched side chains, promoting kerogen maturation.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Chemical
Rui Zhang, Shuaiqi Zhao, Chengzhen Sun, Hui Jin, Kunpeng Zhao, Bofeng Bai
Summary: This study investigates the morphology evolution of lignite particles during supercritical water gasification, and finds that the sharpness of the particles has a significant impact on the gasification efficiency. The presence of high-sharpness structures promotes a particle conversion rate of up to 86.21%. Additionally, an optimized particle morphology of C-s < 0.74 and size D-0 < 1.5 mm achieves an average mass conversion rate of approximately 79.12% without the use of a catalyst.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Weijing Ding, Hui Jin, Panpan Sun
Summary: This article investigates the diffusion behavior of free radicals in supercritical water using molecular dynamics simulation. The results show that higher temperatures promote free radical diffusion under supercritical water conditions, while lower pressure has a positive impact on diffusion coefficients for hydrocarbon radicals.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.
