Article
Chemistry, Applied
Shiwei Ma, Fang Cheng, Junguang Meng, Huijun Ge, Ping Lu, Tao Song
Summary: The feasibility of using Ni-enhanced red mud in chemical looping steam methane reforming (CL-SMR) was evaluated. It was found that the Ni-enhanced red mud displayed desirable reactivity and cyclic stability, with CO selectivity reaching 94.1% and H-2/CO ratio of 2.01 at the most suitable temperature of 900 C. The Ni species effectively activated the C-H bond of methane and facilitated the transfer of lattice oxygen.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Environmental
Fangjun Wang, Shiyi Chen, Shubo Chen, Jun Du, Lunbo Duan, Wenguo Xiang
Summary: This study developed a series of Ni and Co doped CeO2/La2Ni2-xCoxO6 double perovskite composite oxygen carriers for chemical looping steam methane reforming (CL-SMR), achieving the co-production of syngas and hydrogen. The introduction of Co increased surface active sites, accelerating the activation of CH4, while the addition of Ni provided oxygen vacancies to promote oxygen migration. The optimal substitution ratios were 0.6 for cobalt and 1.4 for nickel. The CeO2/La2Ni1.4Co0.6O6 sample showed excellent syngas selectivity (95%) and high methane conversion (86%) at 850 degrees Celsius, with close to 100% hydrogen concentrations in the steam oxidation stage. DFT calculations demonstrated the strongly exothermic partial oxidation of methane, and the CeO2-loaded double perovskite was more conducive to CH4 activation and prevented carbon deposition. The Ni-Co synergistic effect greatly promoted the partial oxidation of methane, and the reduced metals combined with oxygen vacancies provided active stable points for water vapor cracking to generate high-purity hydrogen.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Dingshan Cao, Cong Luo, Fan Wu, Liqi Zhang, Xiaoshan Li
Summary: Chemical looping steam methane reforming (CL-SMR) is a novel process using solid oxygen carriers to produce syngas and hydrogen from methane. This study screened perovskites and found LaFeO3-CeO2 as an optimal oxygen carrier with high hydrogen production, stable reaction performance, and high purity hydrogen. CeO2 loading provides lattice oxygen for syngas production and enhances hydrogen production.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Binlin Dou, Longfei Zhao, Hua Zhang, Kai Wu, Hao Zhang
Summary: The study investigated the use of Ni-based MCM41 and SBA-15 oxygen carriers in chemical looping steam reforming for hydrogen production, with and without CeO2 promoter. Analysis of synthesized oxygen carriers showed thermal decomposition reactions and the catalytic effects of the carriers were observed when CeO2 promoter was used.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Zhifeng Hu, Zhenwu Miao, Jiawei Wu, Enchen Jiang
Summary: Ni/Fe modification of natural ores can improve the reactivity and stability of oxygen carrier for chemical looping steam methane reforming (CL-SMR), enhancing performance and inhibiting agglomeration, with the optimum steam to OC ratio being 0.05. The high ratio of iron to nickel may lead to sintering and decline in OC performance, while the optimal CH4 to OC ratio for highest performance is 0.04.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Xianglei Yin, Shen Wang, Baoyi Wang, Laihong Shen
Summary: The doping of Fe, Co and Ni can improve the oxygen release rate of LaMnO3+delta, with the enhancement effect being the best for Ni. The substitution of Fe, Co and Ni can increase the oxygen release amount, CO selectivity and hydrogen yield. LaMn0.7Fe0.3O3+delta and LaMn0.8Co0.2O3+delta could be used as desirable oxygen carriers for cyclic CLSMR.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Applied
Kun Zhao, Rongjiang Zhang, Yunfei Gao, Yan Lin, Anqi Liu, Xiaobo Wang, Anqing Zheng, Zhen Huang, Zengli Zhao
Summary: This study investigated the use of perovskites as oxygen carriers for chemical looping steam methane reforming, finding that La0.95Ce0.05Ni0.2Fe0.8O3 and La0.95Ce0.05-Ni0.5Fe0.5O3 showed high efficiency in methane partial oxidation and steam splitting, potentially simplifying the separation step for pure hydrogen acquisition.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Applied
Qian Zhang, Bo Jiang, Lin Li, Kun Liu, Nan He, Jing Ma, Xiaoliang Zhang, Dawei Tang
Summary: A multifunctional composite oxygen carrier was developed to significantly improve the CO2 adsorption capacity, H2 production efficiency, and ethanol conversion rate; compared with traditional physically mixed oxygen carriers, the composite oxygen carrier has uniform element distribution, superior reducibility, and shortened dead time; the results show that the multifunctional composite oxygen carrier is more suitable than mixed oxygen carriers for CO2 adsorption and high purity hydrogen production.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Pingchao Zeng, Binlin Dou, Hua Zhang, Kai Wu, Longfei Zhao, Chuanqi Luo, Haisheng Chen, Yujie Xu
Summary: Chemical looping steam reforming (CLSR) using oxygen carriers (OCs) has been demonstrated as an efficient technology for hydrogen production. In this study, NiO/MgAl2O4 OCs were employed for hydrogen production via CLSR with and without CaO sorbent for in-situ CO2 removal (SE-CLSR). The optimal temperature for hydrogen production was found to be 650°C, and the 1g 20NiO/MgAl2O4 catalysts showed high hydrogen selectivity and minimal 'dead time'. High purity hydrogen was successfully obtained via CLSR coupled with CaO sorbent, and stable hydrogen production was achieved with modified stability SE-CLSR experiments.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Xinyi Chen, Guangsheng Zou, Yanliang Yuan, Zuwei Xu, Haibo Zhao
Summary: The research investigates the use of Ni-doped nano-Fe/Ce oxygen carriers for the chemical looping dry reforming of methane. Thermodynamic analysis and reaction simulation are conducted on the CL-DRM process with iron-based oxygen carriers. The experimental results show that the Ni-doped Fe/Ce oxygen carriers achieve high performance and stable cyclic stability due to the high dispersion of Ni and the transformation of Fe oxides and CeO2.
Article
Chemistry, Physical
Xianglei Yin, Shen Wang, Baoyi Wang, Laihong Shen
Summary: The study investigated LaMn1-xAlxO3+delta perovskites as oxygen carriers for CLSMR and found that the substitution of Al increased surface active sites and crystal symmetry, leading to enhanced activation of methane and oxygen release, resulting in higher yield of syngas. The best performance was observed with LaMn0.5Al0.5O3+delta as it exhibited high CO selectivity, yield, and stability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Theodoros Papalas, Evangelos Palamas, Andy N. Antzaras, Angeliki A. Lemonidou
Summary: This study successfully synthesized bimetallic Ni-Co oxygen carriers with ZrO2 as a structure stabilizer using a one-pot sol-gel auto-combustion method. The redox properties and catalytic activity of the reduced state were evaluated, showing that the reduced bimetallic materials exhibited higher reforming activity and stability compared to monometallic materials, with Co addition promoting the oxidation kinetics.
Article
Energy & Fuels
Weixiang Zhang, Lina Zhang, Sijia Pei, Jiarui Wang, Dawei Liu, Xiaoxun Ma, Maohong Fan, Long Xu
Summary: One of the most significant topics in chemical looping reforming technology is the design and preparation of appropriate oxygen carriers with high reactivity and excellent stability. This study focuses on the chemical looping reforming of methane using cobalt-doped Ce-based oxygen carriers synthesized via the solution combustion method with the assistance of coconut shell. The introduction of cobalt decreases the crystallite size, increases oxygen vacancy concentration and lattice oxygen mobility, and the addition of coconut shell further enhances these positive changes and the interaction between Ce and Co.
Article
Energy & Fuels
Janenipa Saupsor, Chunlei Pei, Hongfang Li, Suwimol Wongsakulphasatch, Pattaraporn Kim-Lohsoontorn, Sakhon Ratchahat, Worapon Kiatkittipong, Suttichai Assabumrungrat, Jinlong Gong
Summary: The performances of NiFe-MgAl bifunctional catalysts in the chemical looping reforming of ethanol were studied, showing higher catalytic activity and stability compared to monometallic catalysts. The NiFe-MgAl catalyst provided the highest H-2 concentration at a low reaction temperature and maintained high hydrogen selectivity for repeated cycles.
Article
Energy & Fuels
Yanxin Yang, Yu Qiu, Zhenwu Zhang, Sheng Wang, Hui Chen, Dewang Zeng, Rui Xiao
Summary: Chemical looping methane steam reforming using Ni-promoted Fe2O3/Al2O3 catalysts showed high CH4 conversion, H2 yield, and low carbon deposition due to the facilitation of CH4 activation and enhancement of Fe2O3 reduction by Ni. The synergistic effect between Ni and Fe2O3 can lead to the development of highly active and stable oxygen carriers.
Article
Green & Sustainable Science & Technology
Dashuai Liu, Binlin Dou, Hua Zhang, Kai Wu, Chuanqi Luo, Jinbo Du, Dao Xing Gao, Haisheng Chen, Yujie Xu
Summary: In this study, hydrogen production was investigated through sorption enhanced aqueous phase reforming (APR) of glycerol, a biodiesel byproduct, using Ni-based monometallic and bimetallic catalysts supported on gelatinous MgO supports. The Cu-Ni bimetallic catalyst exhibited higher H2 selectivity and glycerol conversion compared to the Ni-based monometallic catalyst, with increases of over 3% and 30%, respectively. Higher reaction temperature resulted in higher H2 yield but lower H2 selectivity. The catalyst supported on gelatinous MgO showed a 1.25 times higher H2 yield compared to the catalyst with a calcined support. The addition of CaO to the Cu-Ni bimetallic catalyst through in-situ CO2 capture increased the H2 yield and selectivity by more than 58.3% and 14.4%, respectively. CaO promoted the further cleavage of the C-C bond, leading to increased glycerol conversion. The presence of CaO also improved the catalyst stability.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Mechanical
Jiahui Wang, Zhao Yin, Hualiang Zhang, Hongtao Tang, Yujie Xu, Haisheng Chen
Summary: This study proposes an adaptive prediction method based on machine learning for accurate loss prediction in turbine design. The method utilizes neural networks to predict turbine profile loss over a wide incidence range, resulting in significantly improved accuracy compared to traditional models. Furthermore, a multi-objective optimization process based on adaptive prediction is applied to optimize the aerodynamics of the turbine cascade, leading to a reduction in weighted objective and variation of profile loss.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2023)
Article
Energy & Fuels
Lujing Huang, Huan Guo, Yujie Xu, Xuezhi Zhou, Haisheng Chen
Summary: Compressed air energy storage (CAES) systems often operate under off-design conditions, which significantly affect system performance. This study developed an off-design model for a thermal storage CAES system under multiple design points and investigated the effects of off-design operation and design point selection on system performance. The results reveal the relationships between various parameters and system energy storage efficiency.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Materials Science, Multidisciplinary
Haibo Zhao, Xiao Yang, Chunyang Wang, Rui Lu, Ting Zhang, Haisheng Chen, Xinghua Zheng
Summary: Thermal rectification is an important energy management method with potential applications in micro/nano scale heat dissipation, thermoelectric performance improvement, and thermal switches. Simulation and experimental studies are used to explore the mechanisms and principles of thermal rectification, providing theoretical guidance for its development. However, there is limited experimental research on thermal rectification at micro/nano scale, mainly focusing on asymmetric structures, which hinders further device development.
MATERIALS TODAY PHYSICS
(2023)
Article
Thermodynamics
Li Chen, Liang Wang, Yifei Wang, Haisheng Chen, Peng Hu, Xipeng Lin
Summary: This study provides an in-depth investigation of two unconstrained melting phenomena of n-eicosane inside a sphere, namely contact melting and float melting modes, under a non-isothermal wall temperature. The findings reveal that contact melting occurs at a higher rate than float melting due to the long-term contact state of the solid PCM and low thermal resistance across the bottom thin liquid PCM layer.
APPLIED THERMAL ENGINEERING
(2023)
Review
Energy & Fuels
Huan Guo, Haoyuan Kang, Yujie Xu, Mingzhi Zhao, Yilin Zhu, Hualiang Zhang, Haisheng Chen
Summary: This paper summarizes the coupling systems of compressed air energy storage (CAES) technology with wind, solar, and biomass energies from the perspective of system topology, and analyzes the advantages and limitations of each system. It shows that wind energy and CAES are mainly combined in series and parallel, and sometimes wind power can be converted into thermal energy when coupled to CAES. The coupling between solar heat and CAES mainly utilizes solar energy to heat expander inlet air. Biomass and CAES are generally combined using biomass gasification power generation technology.
Article
Energy & Fuels
Pengfei Li, Zhitao Zuo, Xin Zhou, Jingxin Li, Haisheng Chen
Summary: This study investigates the characteristics of an axial compressor at different rotational speeds. It is found that adjusting the rotational speed can expand the working range of the compressor. Through numerical simulations, the reasonable distribution of inlet parameters and the influence of rotational speed changes on internal flow are determined. The research results provide guidance for the stable and efficient operation of axial compressors in compressed air energy storage systems.
Article
Energy & Fuels
Jixiang Chen, Zhitao Zuo, Xin Zhou, Jianting Sun, Jingxin Li, Wenbin Guo, Haisheng Chen
Summary: The oblique flow compressor is an important component in the compressed air energy storage (CAES) system, and the design of the radial inlet chamber (RIC) directly affects its performance. The study investigates the influence of splitter blades on RIC performance by designing 4 RICs with different numbers of splitter blades. The results show that increasing the number of splitter blades improves stall margin and the isentropic efficiency and pressure ratio vary with different blade numbers.
Article
Energy & Fuels
Xue Mi, Chao Chen, Haoqi Fu, Gongcheng Li, Yongxiang Jiao, Fengtao Han
Summary: This research proposed a phase change material (PCM) heat storage wall system with a four-layer structure, and studied the mechanism of electric thermal conversion of the graphene electrothermal film and the heat transfer characteristics of the four-layer structure. The experimental results showed that with the increase in voltage, the temperature of the electrothermal film increases, while its electrothermal conversion efficiency decreases from 85% to 75%; during the heat storage process, the temperature of the PCM wallboard is 3-5 degrees C lower than that of the cement wallboard, but the effective heat storage increases by 59-65%; during the heat release process, the effective heat release of the PCM wallboard increases by 41-78%, and the maximum heat storage and release efficiency is 98%; and at 32 V, the PCM can completely change phase. The theoretical calorific value of the electrothermal film is equivalent to the hourly power generation of 1.45 m(2) of photovoltaic modules. These results provide basic data for the integration of photovoltaic and phase change technology and their efficient application in buildings.
Article
Thermodynamics
Huan Guo, Yujie Xu, Lujing Huang, Jianting Sun, Haisheng Chen
Summary: This paper establishes an optimization strategy based on the corresponding-point methodology (CPM) for CAES systems and modifies the overall evaluation index, Mg. The optimization case of under-water CAES system is analyzed. Results show that the proposed optimization strategy is effective and reveal the influence mechanism of key parameters on the optimization results.
Article
Energy & Fuels
Yu Liu, Zi-Yu Liu, Hualiang Zhang, Yujie Xu, Haisheng Chen
Summary: Extensive research has been conducted on Li-ion batteries to achieve both safety and high energy density. This study successfully synthesized an anode material for lithium storage using cobalt nitrate as a precursor and dates as a carbon source. The carbon derived from dates had desirable properties and effectively maintained the stability of large-capacity Co3O4 particles. The resulting carbon-metal oxide composite electrodes exhibited satisfactory performance in terms of reversible capacity, cycling stability, Coulombic efficiency, and high-rate capability.
Article
Energy & Fuels
Huan Guo, Xiaolu Wang, Lujing Huang, Hualiang Zhang, Jingjian Huang, Yujie Xu, Haisheng Chen
Summary: This paper studies a new integrated system of coal-fired CHP unit with compressed air energy storage (CAES) system, which can greatly adjust the heat-power ratio. A detailed off-design model of the integrated system is established to analyze the influence of key parameters on the system's off-design characteristics. Case study on an industry park data shows that the integrated system can well follow the heat and power demand with relatively high efficiency.
JOURNAL OF ENERGY STORAGE
(2023)
Review
Energy & Fuels
Xinjing Zhang, Yang Li, Ziyu Gao, Shiqing Chen, Yujie Xu, Haisheng Chen
Summary: Compressed air energy storage (CAES) is an effective solution for controlling renewable energy and balancing the mismatch between renewable generation and customer load, thus promoting the penetration of renewable energy. Advanced CAES technologies, such as adiabatic CAES (ACAES), isothermal CAES (ICAES), liquid air energy storage (LAES), supercritical CAES (SC-CAES), underwater CAES (UWCAES), and CAES coupled with other power systems, have been extensively studied and developed in the past decade. This paper provides a comprehensive reference for adjusting novel CAES systems to achieve dynamic operation with high performance, facilitating the integration and planning of different types of CAES and their dynamic control strategies in energy systems for various applications.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Yin Guan, Wen Li, Yangli Zhu, Xing Wang, Gongrui Huang, Haisheng Chen
Summary: There is a pressure difference between the air storage device pressure and turbine inlet pressure of the compressed air energy storage (CAES) system. By using a reasonable air distribution mode, the throttling loss caused by pressure difference can be reduced. This study investigates the characteristics of axial turbine with chamber under two nozzle governing modes, including mass flow rate, specific work, and efficiency. The results show that compared with throttle governing, the optimal mode under rated mass flow rate increases the average specific work of the turbine by 6.8% and the average total efficiency by 7.0%. The flow field loss is mainly related to the decreased regulated pressure.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Multidisciplinary
Yuanyuan Jing, Jun Luo, Xue Han, Jiawei Yang, Qiulin Liu, Yuanyuan Zheng, Xinyi Chen, Fuli Huang, Jiawen Chen, Qinliang Zhuang, Yanan Shen, Haisheng Chen, Huaizhou Zhao, G. Jeffrey Snyder, Guodong Li, Ting Zhang, Kun Zhang
Summary: Researchers have developed a large-area, durable, washable, and skin-conformable wearable thermoelectric textile that can rapidly and stably cool the body surface and be powered by solar energy, reducing energy consumption.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)