Article
Energy & Fuels
Fa-qiang Su, Tao Zhang, Jun-bo Wu, Qi-chao Deng, Akihiro Hamanaka, Yi-he Yu, Meng-jia Dai, Xiao-long He, Jun-nan Yang
Summary: In this paper, UCG simulation experiments were conducted to investigate the effects of the gasification agent ratio on the composition and calorific value of the product gas. An energy recovery evaluation method and an evaluation model of the underground coal gasification temperature field were established. The results showed that increasing the oxygen concentration improved the calorific value of the produced gas and the energy recovery rate.
Article
Thermodynamics
Changyifan Ren, Dianqi Hu, Yunan Chen, Liejin Guo
Summary: An auto-thermal supercritical water co-gasification system was developed for H2 and heat production from sewage sludge and coal. Thermodynamic analysis and life cycle environmental impact assessment were performed, showing the sensitivity of H2 yield to the proportion of preheated water and dry coal to dry sewage sludge. Adding 21% dry coal was necessary when the system was energy self-sufficient to treat sewage sludge directly.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Deming Zhang, Bin Bai, Runyu Wang, Jiajing Kou, Wenwen Wei, Hui Jin, Liejin Guo
Summary: The study investigated the impact of K2CO3 and Al2O3 on ash agglomeration in coal SCWG, finding that K2Si2O5 plays a cohesive role between ash particles whereas Al2O3 can effectively solve this issue and enhance carbon gasification efficiency.
Article
Construction & Building Technology
Ary A. Hoyos-Montilla, Jorge I. Tobon, Francisca Puertas
Summary: This research examines the influence of calcium hydroxide on the alkaline activation of coal fly ash with sodium hydroxide. The presence of calcium hydroxide increased the compressive strength and modified the type and quantity of cementing gels.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Green & Sustainable Science & Technology
Chaowei Wang, Song He, Sheng Li, Lin Gao
Summary: High water consumption is hindering the development of the coal chemical industry in China. Research shows that upgrading cooling water technology and adopting water-saving gasification methods can significantly reduce water consumption in the coal-to-synthetic natural gas process. By integrating water networks and improving other units, water consumption can be further reduced to levels lower than 3.50 t/kNm(3).
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Biochemistry & Molecular Biology
Jianyun Zhang, Zhiwei Yang, Linwei Ma, Weidou Ni
Summary: This study quantified the exergy losses of coal-based series polygeneration systems and evaluated the potential efficiency improvements achievable by applying advanced technologies. It found that overall exergy loss can be significantly reduced by implementing selected advanced technologies in gasification, methanol synthesis, and power generation components of the system.
Article
Thermodynamics
Yuhao Tian, Hao Feng, Ying Zhang, Qiang Li, Dong Liu
Summary: In this study, we proposed and investigated a power generation system called CAllam cycle, which combines coal gasification in supercritical water with the Allam cycle. Our simulations compared the CAllam cycle with the natural gas Allam cycle and explained the underlying mechanisms of the differences. Results showed that recycling CO2 improved system efficiency and reduced gas turbine blade temperature. The optimized CAllam cycle achieved a maximum system efficiency of 53.19% with a CO2 recycling ratio of 1.158 and a gas turbine outlet pressure of 2.43 MPa, using 40 wt% Hongliulin coal as an example.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Song He, Sheng Li, Lin Gao
Summary: The coal gasification process plays a significant role in polygeneration systems and can greatly impact system performance. This study integrated a novel methanol-electricity polygeneration system using coal-steam gasification, resulting in a substantial increase in energy efficiency. Through exergy analysis and comparison of energy efficiency, the study demonstrated the system's energy saving potential and the influence of gasification processes on system performance.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Chemistry, Applied
Ruiqi Mu, Ming Liu, Junjie Yan
Summary: Supercritical water gasification (SCWG) is a promising technique to convert coal into hydrogen-rich syngas. Advanced exergy analysis shows that SCWG has a higher exergy efficiency compared to conventional (CG) and chemical looping gasification (CLG). The gasifier in SCWG process has the highest irreversibility caused by gasification reaction, but also has a high potential for avoidable exergy destruction. Additionally, parameters such as coal water slurry concentration (CWSC), gasification temperature, gasification pressure, and oxygen-coal ratio have significant effects on the performance of SCWG.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Physical
Chuang Yang, Shuzhong Wang, Yanhui Li, Yishu Zhang, Chengchao Cui
Summary: This study investigates the thermodynamic equilibrium analysis of supercritical water gasification involving different feedstocks like coal, sewage sludge, microalgae, and sawdust. The results show that temperature and feed concentration play a crucial role in determining hydrogen yield, while pressure has minimal effects. An optimal feed concentration of 15-20 wt% is found for hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Shenghui Guo, Yu Wang, Fei Shang, Lei Yi, Yunan Chen, Bin Chen, Liejin Guo
Summary: Supercritical water gasification (SCWG) is a promising clean technology for utilizing solid fuel or waste without gaseous pollution. This paper proposes an innovative series design for heat integration in the SCWG system that considers the gasification process, which increases the overall system efficiency. The thermodynamic analysis shows significant improvements in cold gas and exergy efficiency compared to previous single-stage gasification reactors.
Article
Chemistry, Physical
Huan Liu, Shuqin Liu
Summary: This study compares energy consumption and greenhouse gas emissions between underground coal gasification (UCG)-based hydrogen production (UCG-H-2) and surface coal gasification (SCG)-based hydrogen production (SCG-H-2) using life cycle assessment. Results show UCG-H-2 has significant energy saving advantage, and 80% capture rate can achieve a balance between energy consumption and emissions. Scenario analysis suggests UCG substitution for hydrogen production can reduce energy consumption significantly.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Xi Cao, Lingxue Kong, Jin Bai, Zefeng Ge, Wen Li, Guangsuo Yu
Summary: This study investigated the viscosity temperature characteristics of slag under water vapor atmosphere and established an optimization model for predicting slag viscosity, which can effectively predict the viscosity and Tcv of the slag.
Article
Thermodynamics
Cesare Freda, Pietro Tarquini, Vinod Kumar Sharma, Giacobbe Braccio
Summary: The thermodynamic study of driving biomass gasification using medium temperature solar technology reveals the highest cold gas efficiency in solar driven supercritical water gasification, demonstrating its potential in this integration.
Article
Energy & Fuels
Akihiro Hamanaka, Fa-qiang Su, Ken-ichi Itakura, Kazuhiro Takahashi, Jun-ichi Kodama, Gota Deguchi
Summary: This study discusses the application of a coaxial UCG system with a horizontal hole through model experiments, evaluating the impact of coal quality on the temperature distribution of the gasification area and product gas quality.
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)
