Article
Chemistry, Analytical
Yuhui Zhang, Xin Jia, Dengguo Lai, Zhennan Han, Xingfei Song, Chao Wang, Guangwen Xu
Summary: The impact of CO2 on the pyrolysis characteristics in reactor with internals was studied by conducting pyrolysis experiments of Yulin coal under N2 (inert) and CO2 (active) atmospheres in fixed-bed reactors for two types of pyrolysis, with and without internals. It was found that CO2 exhibited different effects on tar yield for the two types of pyrolysis, raising tar yield for pyrolysis in reactor without internals but lowering tar yield for that with internals. The tar yield under CO2 atmosphere with internals was 6.31 wt%, which was still 15.97% higher than that without internals at 1000 degrees C.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Chemistry, Applied
Lin Li, Shuai Tong, Lunbo Duan, Changsui Zhao, Zhipeng Shi
Summary: By comparing chars produced under different atmospheres, it was found that the pore structure and specific surface area of chars are significantly affected by the gasification environment, while the presence of chemical groups has a minor impact on the chars. The best gasification reactivities were obtained on the chars produced under 50%CO2/50%N2 and 50%H2O/50%N2 atmospheres, largely influenced by the porosity of the chars.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Engineering, Environmental
Song Qianshi, Wang Xiaohan, Li Haowen, Yang Zixin, Ye Yue, Huo Jiepeng
Summary: The study found that the self-developed char reactivity model accurately predicted the reaction rate of char samples under different gasification temperatures, providing a valuable reference for predicting char gasification reaction rate.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Kagiso Bikane, Jie Yu, Ravi Shankar, Xiangyi Long, Nigel Paterson, Marcos Millan
Summary: This study investigates the gasification kinetics of Morupule coal in atmospheric pressure CO2 and the structural evolution of residual chars. The research shows that gasification reaction rates are high, with little impact on the bulk chemical structure of chars but significant changes in surface chemistry. Residual chars from gasification experiments exhibit lower combustion reactivity compared to chars produced under inert pyrolysis conditions.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Yun Liu, Yuan Zhang, Yu-qing Zhang, Lian-sheng Chen, Hai-ying Li, Hui-min Liu
Summary: The study investigated the effects of pyrolysis heating rate on the char structure and CO2 gasification reactivity of energy crops, revealing that bio-char obtained at a rapid heating rate had more structural defects and carbon crystallite imperfections, leading to higher gasification reactivity. However, this also resulted in a decrease in crystallization size, graphitization, and aromatization degree.
Article
Thermodynamics
Ruochen Wu, Jacob Beutler, Larry L. Baxter
Summary: This investigation examines the trends in biomass char diameter during gasification using continuous particle size data and a theoretical model to describe the variations. The model captures the qualitative and most of the quantitative variation in the data.
Article
Energy & Fuels
Cheng Ma, Qiuxiang Yao, Yuzhen Zhao, Chong Zou, Junxue Zhao, Zongcheng Miao
Summary: Char gasification allows for the clean and efficient utilization of low-rank coal resources. The CO2 gasification behavior and kinetics of char samples produced under different atmospheric conditions were investigated. The results showed that the physicochemical structure and characteristics of the char samples had a significant impact on the gasification rate and activation energy. The application of a three-dimensional diffusion model provided insights into the CO2 gasification process of coal char.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
Article
Chemistry, Multidisciplinary
Qinghua Guo, Yuchen Huang, Qing He, Yan Gong, Guangsuo Yu
Summary: The study found that coal char prepared by wet impregnation had higher reactivity, and the optimal addition method is wet impregnation with a 2% catalyst. The iron-based catalyst can accelerate the gasification rate and provide higher catalytic activity.
Article
Energy & Fuels
Bo Wang, Fanfan Xu, Xin Wang, Jun Li, Yongyi Song, Yingyun Qiao, Yuanyu Tian
Summary: This study provides a comprehensive comparative investigation on feedstock pyrolysis and char gasification performance of typical forestry biomass from Northeast Asia. The results showed that different forestry biomass has close thermal decomposition characteristics, and Salicaceae char has better gasification performance than Pinaceae char due to its high AAEMs content.
Article
Energy & Fuels
Bo Wang, Fanfan Xu, Xin Wang, Jun Li, Yongyi Song, Yingyun Qiao, Yuanyu Tian
Summary: The present study provides a comprehensive comparative investigation on the feedstock pyrolysis and char gasification performance of typical forestry biomass from Northeast Asia. The results show that different forestry biomass has similar thermal decomposition characteristics, and the performance of Salicaceae is better than that of Pinaceae in terms of pyrolysis and char gasification.
Article
Engineering, Environmental
Jorge Preciado-Hernandez, Juan Zhang, Isabelle Jones, Mingming Zhu, Zhezi Zhang, Dongke Zhang
Summary: The study investigated the effects of steam activation on pyrolysis char under different conditions, showing that the steam gasification reaction was kinetically controlled. The volumetric model was found to best describe the behavior of the solid-gas gasification reaction rate.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Dikun Hong, Liang Liu, Chunbo Wang, Ting Si, Xin Guo
Summary: An atomistic coal char representation was constructed via ReaxFF MD simulation, investigating the combustion and gasification characteristics of the char. The activation energies obtained for various reactions were in good agreement with experimental data, revealing the generation of large amounts of C2 species during char-H2O gasification.
Article
Energy & Fuels
Christoph Schneider, Stella Walker, Aekjuthon Phounglamcheik, Kentaro Umeki, Thomas Kolb
Summary: This study investigates the thermal deactivation of beech wood chars during secondary pyrolysis, showing that the initial conversion rate Ro decreases linearly from 1000 degrees C to 1400 degrees C, but increases significantly at 1600 degrees C. Graphitization of the carbon matrix and CaO dispersion were also analyzed, indicating the formation of thin CaO layers at 1600 degrees C, which greatly affect the char reactivity.
Article
Energy & Fuels
Zixin Jiao, Li Liu, Yan Zhao, Xiye Chen, Penghua Qiu
Summary: The study evaluated the cogasification reactivity of Shenmu bituminous coal (SM) char and corn straw (CS) char in CO2 and found that increasing the blend ratio of CS and gasification temperature can weaken inhibition and enhance synergy. The addition of CS volatiles, especially potassium (K), can promote the cogasification reaction, with the promotion effect increasing with temperature. The comparison between CS-SM blend char and CS char volatiles-SM char showed different effects on gasification reactivity depending on the presence of alkali and alkaline earth metals.
Article
Energy & Fuels
Juan Zhang, Mingming Zhu, Isabelle Jones, Chiemeka Onyeka Okoye, Zhezi Zhang, Jian Gao, Dongke Zhang
Summary: This study investigated the transformation of sulphur during steam gasification of a spent tyre pyrolysis char. The results showed that the proportion of organic sulphur increased while the proportion of inorganic sulphur decreased with increasing gasification time and temperature. The main organic sulphur species were thiophene, aliphatic sulphide, sulphone, and sulphoxide, while the main inorganic sulphur species were ZnS and sulphate.
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.