Article
Engineering, Environmental
Hyung Jin Yoon, Chan Hyun Lee, Ki Bong Lee
Summary: In this study, mass transfer enhanced CaO pellets were prepared by utilizing CO2 evacuation to form channels, which significantly improved the initial stage of CO2 sorption and accelerated the sorption kinetics. The enhanced mass transfer not only increased the CO2 sorption uptake at different temperatures, but also had a positive effect on CO2 release after capture. The fast CO2 sorption and regeneration kinetics of the new pellets significantly enhanced the energy efficiency of continuous CO2 capture processes.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Viktor Alexandrovich Kuznetsov, Daria Mikhailovna Bozheeva, Andrey Viktorovich Minakov
Summary: Combustion or gasification of coal in a nitrogen-free environment is a promising technology for reducing the carbon footprint. This study numerically investigates the oxy-gasification processes of pulverized coal in a CO2-H2O-O-2 environment and examines the influence of various factors on the physicochemical processes and syngas composition. The results show that increasing oxygen concentration in the blast can stabilize ignition and combustion of coal, while decreasing the excess oxygen ratio leads to increased combustible losses in the gasifier.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Hyung Jin Yoon, Sungyong Mun, Ki Bong Lee
Summary: This study demonstrated that the CO2 sorption performance of CaO-based sorbents can be maximized through simple mechanical ball-milling, and the used sorbents can be successfully reactivated using this method. The research highlighted the critical role of CaO particle size in affecting CO2 sorption performance, showing that reducing particle size can significantly improve sorption capacity.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Azra Nawar, Majid Ali, Asif Hussain Khoja, Adeel Waqas, Mustafa Anwar, Mariam Mahmood
Summary: In this study, waste eggshells were used to synthesise structure modified CaO with organic acids for efficient CO2 capture. Among the modified sorbents, citric acid modification showed the highest CO2 uptake, making it a promising candidate for economical CO2 capture.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Chemical
Xiaotong Ma, Jun Li, Xingkang Huang, Jingyang Du, Xiao Lu, Tai Feng
Summary: Coal-fired power plants are a major source of arsenic and selenium emissions. A new study found that CO2 has a suppression effect on the removal of arsenic and selenium. The presence of CO2 weakens the adsorption of As2O3/SeO2 on CaO surfaces by changing the electronic field. Additionally, CO2 has a greater negative effect on arsenic capture compared to selenium capture.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Energy & Fuels
Nana Wang, Xin Guo, Suxia Ma, Yuchuan Feng
Summary: The synergistic effect of Ni/Al2O3 on the carbonation properties and sintering resistance of CaO sorbents was investigated through experiments and density functional theory (DFT) calculations. It was found that Ni aggravates the sintering of CaO and reduces its cyclic adsorption capacity. However, the addition of Al2O3 support effectively improves the pore structure and maintains the cycle stability of CaO sorbents. DFT calculations indicate that Ni weakens the adsorption energy of Ca4O4 cluster on CaO surface, leading to the growth of CaO grains.
Article
Chemistry, Multidisciplinary
Yun-Yang Lee, Nalinda P. Wickramasinghe, Ruth Dikki, Darrell L. Jan, Burcu Gurkan
Summary: This study developed a facilitated transport membrane (FTM) using functionalized ionic liquid (IL) and poly(ionic liquid) (PIL) carriers to separate CO2 from air. The results showed that the membrane achieved efficient CO2 separation under certain conditions. Additionally, the study analyzed the effects of carrier binding to CO2, ion diffusivities, and gel glass transition temperature on membrane performance.
Article
Chemistry, Multidisciplinary
Hao Liu, Sufang Wu
Summary: This research focuses on improving the efficiency and durability of CO2 capture in calcium looping technology by doping the adsorbent with high thermal conductivity BeO. The results show that the addition of 15.6wt% BeO in nano-CaO-BeO/Al2O3 adsorbent enhances the decomposition rate, lowers the regeneration temperature, and increases the carbonation conversion rate in infinite cycles.
Article
Chemistry, Applied
Shuang Xing, Rui Han, Yang Wang, Caihong Pang, Yang Hao, Xueqian Wu, Chunfeng Song, Qingling Liu
Summary: In this study, aluminum-oxide deposited CaO/CuO composites with highly porous structures and fine grain sizes were synthesized using the space-confined chemical vapor deposition method. These composites exhibited significantly enhanced CO2 capture performance and cycling stability.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Engineering, Environmental
Yongqing Xu, Bowen Lu, Cong Luo, Jian Chen, Zewu Zhang, Liqi Zhang
Summary: The study successfully improved the quality of H-2 gas produced during the sorption enhanced steam reforming (SESRE) process of ethanol by coupling novel CaO-based porous spherical sorbents with conventional Ni/Al2O3 catalyst. The results showed that the sorption enhanced steam reforming process is an effective and flexible way to produce high-quality H-2 around 600 degrees C, and the simulated sorption enhanced process was experimentally validated.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Biochemistry & Molecular Biology
Zhiqiang Ni, Yue Cao, Xiaopeng Zhang, Ning Zhang, Wu Xiao, Junjiang Bao, Gaohong He
Summary: This paper presents an optimization model based on the superstructure method to determine the best membrane process for CO2 capture. The results show that the combination of different membrane types achieves better results, with a CO2 capture cost reduced to 11.75$/tCO2.
Article
Green & Sustainable Science & Technology
Ashak Mahmud Parvez, Selina Hafner, Matthias Hornberger, Max Schmid, Guenter Scheffknecht
Summary: Sorption Enhanced Gasification (SEG) is a promising technology for solid fuel conversion and carbon capture and sequestration, with proven scale-up potential and the ability to produce H2-rich syngas and reduce CO2 emissions. The operational temperature window of SEG ranges from 600 to 750 degrees Celsius, and desired syngas compositions can be achieved through process optimization.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Engineering, Chemical
Xiaowan Peng, Yun-Lei Peng, Meng Huo, Jin Zhao, Qiuwei Ma, Bei Liu, Chun Deng, Mingke Yang, Baocan Dong, Changyu Sun, Guangjin Chen
Summary: To enhance CO2 capture capacity and selectivity, researchers have developed a porous slurry composed of ZIF-8 and C16 isoparaffin. This optimized slurry exhibits low viscosity, high sorption speed, and low CO2 sorption heat. It also demonstrates higher CO2 sorption capacity and selectivity compared to existing commercial CO2 absorbents. Additionally, the slurry system can be easily regenerated through pressure swing, making it a promising alternative for separating IGCC gas with higher efficiency and lower energy cost.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Jian Chen, Yuxin Jiang, Xilei Liu, Weimin Xia, Anqi Huang, Jiacheng Zong, Zhicheng Wang, Bin Qian, Felix Donat
Summary: In this study, a one-step synthesis of CaO/CuO composite pellets with enhanced CO2 capture performance was achieved using a gel-casting technique. By adjusting the immersion time and the molar ratio of Ca to Cu, composite pellets with homogeneous elemental distribution and a molar ratio of 1 could be obtained. The addition of glucose as a pore-forming material improved the CO2 capture performance of the modified composite pellets.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Nanoscience & Nanotechnology
Ralph Rajamathi, Bhojaraj, C. Nethravathi
Summary: Monolithic porous nanostructures of CaO-MgO composites were synthesized by a rapid self-sustained combustion reaction, showing enhanced cycle stability and CO2 capture capacity with the addition of MgO.
ACS APPLIED NANO MATERIALS
(2021)
Review
Energy & Fuels
Ahsanullah Soomro, Shiyi Chen, Zhao Sun, Shiwei Ma, Wenguo Xiang
Summary: This paper assessed the product distribution variations in thermochemical processes fueled with cellulose, lignin, cellulose-rich, and lignin-rich biomasses, using principal component analysis (PCA) to understand the influence of elemental properties. The results indicated that cellulose and lignin, with high volatile matter and fixed carbon contents respectively, are suitable for liquid and solid product production.
BIOMASS CONVERSION AND BIOREFINERY
(2021)
Article
Thermodynamics
Shiyi Chen, Yilin Zheng, Mudi Wu, Jun Hu, Wenguo Xiang
Summary: The supercritical CO2 (sCO(2)) Brayton cycle is efficient and compact, expected to replace the steam Rankine cycle in various applications. Integrating sCO(2) cycle with single-stage reheating and recompression with pulverized coal oxy-fuel combustion process has been shown to increase total efficiency, with wet mode showing higher efficiency under basic sCO(2) cycle conditions.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Energy & Fuels
Qiwei Cao, Shiyi Chen, Yingjiu Zheng, Yongneng Ding, Yin Tang, Qin Huang, Kaizhu Wang, Wenguo Xiang
Summary: This paper analyzes the performance degradation of turbomachinery in gas turbines, predicts degradation trends through deep neural networks, builds regression and classification models. The optimized model shows higher accuracy and no overfitting, and the prediction model achieves high accuracy in classifying degradation.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Applied
Lin Li, Lunbo Duan, Zhihao Yang, Yueming Wang, Wenguo Xiang
Summary: This study proposed a process route for in-situ denitration in circulating fluidized bed reactor by adding catalyst, and verified its feasibility in various reactor and combustor scales. The results demonstrated that catalyst addition can significantly reduce NOx emissions without adverse effects on combustion characteristics.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Energy & Fuels
Fang Cheng, Aijing Yan, Shiwei Ma, Shiyi Chen, Tao Song, Ping Lu, Wenguo Xiang
Summary: The study focused on the performance evolution of Sm-doped Fe2O3/CeO2 in chemical looping hydrogen generation (CLHG) and found that the activation and attenuation processes could be attributed to changes in particle microstructure and enhanced interaction between Fe2O3 and CeO2 leading to the generation of CeFeO3.
Article
Engineering, Chemical
Jun Hu, Haobo Li, Shiyi Chen, Wenguo Xiang
Summary: Fe2O3/Al2O3 oxygen carriers improved with Mg addition demonstrated excellent reactivity and stability for chemical looping steam reforming of methane (CLSR). The increase in Mg/Al ratio led to decreased lattice oxygen activity but improved methane conversion and CO selectivity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Environmental Sciences
Mudi Wu, Haobo Li, Shiwei Ma, Shiyi Chen, Wenguo Xiang
Summary: The introduction of nickel atoms and nanorods structures significantly enhances the surface oxygen activity and catalytic performance of perovskite oxides, leading to a temperature reduction of approximately 90 degrees Celsius for the oxidation of toluene.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Shubo Chen, Wenguo Xiang, Shiyi Chen
Summary: Based on the density functional theory, a microscopic model of metal Fe, Al-doped NiO was established to study its effects on the performance of chemical looping combustion. The results showed that the Al-doped surface reduced the intermediate state energy and reaction energy, enhanced the activity of NiO surface, suppressed carbon deposition, and promoted subsequent reactions.
Article
Engineering, Mechanical
Qiwei Cao, Shiyi Chen, Dongdong Zhang, Wenguo Xiang
Summary: This article proposes an adaptive soft-sensing multi-level modeling method based on the combination of just in time learning and ensemble learning, which can effectively predict difficult-to-measure variables of gas turbines. The method is validated through actual operating data, confirming its effectiveness.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Shubo Chen, Wenguo Xiang, Shiyi Chen
Summary: In this study, density functional theory (DFT) calculations were used to investigate the reaction mechanism of producing syngas through chemical looping reforming of methane on NiO-based surfaces. The research focused on the basic reaction steps and the formation and removal of carbon deposits. The results showed that the NiO/Al2O3 surface with Al-Ni structure had better lattice oxygen transferring ability and anti-carbon properties.
APPLIED SURFACE SCIENCE
(2022)
Article
Thermodynamics
Shiyi Chen, Nan Zhou, Mudi Wu, Shubo Chen, Wenguo Xiang
Summary: This paper investigates the integration of a natural gas-fueled MCFC with internal reforming and chemical looping air separation (CLAS) to achieve high-efficiency power generation with CO2 capture. The system is analyzed for thermodynamic and economic performance, and the results show the plant net power efficiency, CO2 capture rate, and cost of electricity.
Article
Thermodynamics
Nan Zhou, Jun Du, Mudi Wu, Wenguo Xiang, Shiyi Chen
Summary: Pressurization increases power efficiency, and coupling it with a supercritical CO2 Brayton cycle offers higher efficiency than steam-based power cycles with CO2 capture. Three layouts of the coupled system were analyzed thermodynamically and economically, with net power efficiencies of 39.4%, 40.2%, and 41.3%. Sensitivity analysis evaluated the impact of various factors on net power efficiency, and economic analysis showed their attractiveness for coal-fired power generation with CO2 capture.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Engineering, Chemical
Fangjun Wang, Shiyi Chen, Jiang Wu, Wenguo Xiang, Lunbo Duan
Summary: A 2D/3D g-C3N4/ZnIn(2)S(4) heterojunction photocatalyst was constructed and showed outstanding performance in CO2 photoreduction. The fabrication process and electronic changes of the heterojunction were analyzed experimentally and theoretically, and a feasible mechanism for the photocatalytic reduction of CO2 on the g-C3N4/ZnIn2S4 composite was proposed.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Review
Engineering, Environmental
Mudi Wu, Jiyu Sun, Wenguo Xiang, Shiyi Chen
Summary: Catalytic oxidation, a technology that converts hazardous materials to harmless molecules, has been widely studied for atmospheric pollution treatment. Recent attention has been focused on catalyst synthesis via defect engineering, which creates defects in materials to regulate their electronic properties and enhance catalytic performance. However, there is still a lack of systematic understanding of the application of defect engineering in catalytic oxidation. This review summarizes the recent progress in applying defect engineering, including the introduction of different types of defects, strategies to create defects, and the impact of defects on catalyst properties and performance.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Proceedings Paper
Agricultural Economics & Policy
Shi Yan, Xiang Wenguo, Chen Shiyi
Summary: Domestic gas-steam combined cycle units face issues such as frequent start and stop, large load changes, and accelerated development of defects. It is important to strengthen the monitoring and inspection of metal components to prevent fatigue, cracks, and organizational deterioration.
2020 INTERNATIONAL CONFERENCE ON CLIMATE CHANGE, GREEN ENERGY AND ENVIRONMENTAL SUSTAINABILITY (CCGEES 2020)
(2021)
Article
Energy & Fuels
Shitong Fang, Houfan Du, Tao Yan, Keyu Chen, Zhiyuan Li, Xiaoqing Ma, Zhihui Lai, Shengxi Zhou
Summary: This paper proposes a new type of nonlinear VIV energy harvester (ANVEH) that compensates for the decrease in peak energy output at low wind speeds by introducing an auxiliary structure. Theoretical and experimental results show that ANVEH performs better than traditional nonlinear VIV energy harvesters under various system parameter variations.
Article
Energy & Fuels
Wei Jiang, Shuo Zhang, Teng Wang, Yufei Zhang, Aimin Sha, Jingjing Xiao, Dongdong Yuan
Summary: A standardized method was developed to evaluate the availability of solar energy resources in road areas, which combined the Analytic Hierarchy Process (AHP) and the Geographic Information System (GIS). By analyzing critical factors and using a multi-indicator evaluation method, the method accurately evaluated the utilization of solar energy resources and guided the optimal location selection for road photovoltaic (PV) projects. The results provided guidance for the application of road PV projects and site selection for route corridors worldwide, promoting the integration of transportation and energy.
Article
Energy & Fuels
Chang Liu, Jacob A. Wrubel, Elliot Padgett, Guido Bender
Summary: The study investigates the effects of coating defects on the performance of the anode porous transport layer (PTL) in water electrolyzers. The results show that an increasing fraction of uncoated regions on the PTL leads to decreased cell performance, with continuous uncoated regions having a more severe impact compared to multiple thin uncoated strips.
Article
Energy & Fuels
Marcos Tostado-Veliz, Xiaolong Jin, Rohit Bhakar, Francisco Jurado
Summary: In this paper, a coordinated charging price mechanism for clusters of parking lots is proposed. The research shows that enabling vehicle-to-grid characteristics can bring significant economic benefits for users and the cluster coordinator, and vehicle-to-grid impacts noticeably on the risk-averse character of the uncertainty-aware strategies. The developed pricing mechanism can reduce the cost for users, avoiding to directly translate the energy cost to charging points.
Article
Energy & Fuels
Duan Kang
Summary: Building an energy superpower is a key strategy for China and a long-term goal for other countries. This study proposes an evaluation system and index for measuring energy superpower, and finds that China has significantly improved its ranking over the past 21 years, surpassing other countries.
Article
Energy & Fuels
Fucheng Deng, Yifei Wang, Xiaosen Li, Gang Li, Yi Wang, Bin Huang
Summary: This study investigated the synergistic blockage mechanism of sand and hydrate in gravel filling layer and the evolution of permeability in the layer. Experimental models and modified permeability models were established to analyze the effects of sand particles and hydrate formation on permeability. The study provided valuable insights for the safe and efficient exploitation of hydrate reservoirs.
Article
Energy & Fuels
Hao Wang, Xiwen Chen, Natan Vital, Edward Duffy, Abolfazl Razi
Summary: This study proposes a HVAC energy optimization model based on deep reinforcement learning algorithm. It achieves 37% energy savings and ensures thermal comfort for open office buildings. The model has a low complexity, uses a few controllable factors, and has a short training time with good generalizability.
Article
Energy & Fuels
Moyue Cong, Yongzhuo Gao, Weidong Wang, Long He, Xiwang Mao, Yi Long, Wei Dong
Summary: This study introduces a multi-strategy ultra-wideband energy harvesting device that achieves high power output without the need for external power input. By utilizing asymmetry, stagger array, magnetic coupling, and nonlinearity strategies, the device maintains a stable output voltage and high power density output at non-resonant frequencies. Temperature and humidity monitoring are performed using Bluetooth sensors to adaptively assess the device.
Article
Energy & Fuels
Tianshu Dong, Xiudong Duan, Yuanyuan Huang, Danji Huang, Yingdong Luo, Ziyu Liu, Xiaomeng Ai, Jiakun Fang, Chaolong Song
Summary: Electrochemical water splitting is crucial for hydrogen production, and improving the hydrogen separation rate from the electrode is essential for enhancing water electrolyzer performance. However, issues such as air bubble adhesion to the electrode plate hinder the process. Therefore, a methodology to investigate the two-phase flow within the electrolyzer is in high demand. This study proposes using a microfluidic system as a simulator for the electrolyzer and optimizing the two-phase flow by manipulating the micro-structure of the flow.
Article
Energy & Fuels
Shuo Han, Yifan Yuan, Mengjiao He, Ziwen Zhao, Beibei Xu, Diyi Chen, Jakub Jurasz
Summary: Giving full play to the flexibility of hydropower and integrating more variable renewable energy is of great significance for accelerating the transformation of China's power energy system. This study proposes a novel day-ahead scheduling model that considers the flexibility limited by irregular vibration zones (VZs) and the probability of flexibility shortage in a hydropower-variable renewable energy hybrid generation system. The model is applied to a real hydropower station and effectively improves the flexibility supply capacity of hydropower, especially during heavy load demand in flood season.
Article
Energy & Fuels
Zhen Wang, Kangqi Fan, Shizhong Zhao, Shuxin Wu, Xuan Zhang, Kangjia Zhai, Zhiqi Li, Hua He
Summary: This study developed a high-performance rotary energy harvester (AI-REH) inspired by archery, which efficiently accumulates and releases ultralow-frequency vibration energy. By utilizing a magnetic coupling strategy and an accumulator spring, the AI-REH achieves significantly accelerated rotor speeds and enhanced electric outputs.
Article
Energy & Fuels
Yi Yang, Qianyi Xing, Kang Wang, Caihong Li, Jianzhou Wang, Xiaojia Huang
Summary: In this study, a novel hybrid Quantile Regression (QR) model is proposed for Probabilistic Load Forecasting (PLF). The model integrates causal dilated convolution, residual connection, and Bidirectional Long Short-Term Memory (BiLSTM) for multi-scale feature extraction. In addition, a Combined Probabilistic Load Forecasting System (CPLFS) is proposed to overcome the inherent flaws of relying on a single model. Simulation results show that the hybrid QR outperforms traditional models and CPLFS exceeds the best benchmarks in terms of prediction accuracy and stability.
Article
Energy & Fuels
Wen-Jiang Zou, Young-Bae Kim, Seunghun Jung
Summary: This paper proposes a dynamic prediction model for capacity fade in vanadium redox flow batteries (VRFBs). The model accurately predicts changes in electrolyte volume and capacity fade, enhancing the competitiveness of VRFBs in energy storage applications.
Article
Energy & Fuels
Yuechao Ma, Shengtie Wang, Guangchen Liu, Guizhen Tian, Jianwei Zhang, Ruiming Liu
Summary: This paper focuses on the balance of state of charge (SOC) among multiple battery energy storage units (MBESUs) and bus voltage balance in an islanded bipolar DC microgrid. A SOC automatic balancing strategy is proposed considering the energy flow relationship and utilizing the adaptive virtual resistance algorithm. The simulation results demonstrate the effectiveness of the proposed strategy in achieving SOC balancing and decreasing bus voltage unbalance.
Article
Energy & Fuels
Raad Z. Homod, Basil Sh. Munahi, Hayder Ibrahim Mohammed, Musatafa Abbas Abbood Albadr, Aissa Abderrahmane, Jasim M. Mahdi, Mohamed Bechir Ben Hamida, Bilal Naji Alhasnawi, A. S. Albahri, Hussein Togun, Umar F. Alqsair, Zaher Mundher Yaseen
Summary: In this study, the control problem of the multiple-boiler system (MBS) is formulated as a dynamic Markov decision process and a deep clustering reinforcement learning approach is applied to obtain the optimal control policy. The proposed strategy, based on bang-bang action, shows superior response and achieves more than 32% energy saving compared to conventional fixed parameter controllers under dynamic indoor/outdoor actual conditions.
