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.
Review
Agricultural Engineering
Fengming Zhang, Yufeng Li, Zhaojian Liang, Tong Wu
Summary: Supercritical water oxidation (SCWO) is an effective and promising technology for destroying organic waste and converting it into energy. However, the energy consumption cost is still high and there is a need for systematic analysis and improvement of energy conversion and utilization.
BIOMASS & BIOENERGY
(2022)
Article
Energy & Fuels
Mei Yang, Yunlong Zhou, Jinfu Yang, Jiaxin Bao, Di Wang, Qingshan Yu
Summary: This study reconstructed a thermodynamic system for a coal-fired power plant and proposed an efficient waste heat utilization system. By increasing the extraction steam flow and preheating the air, the efficiency of the power plant was significantly improved while reducing energy loss.
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
Thermodynamics
Jia Liu, Nan Hu, Li-Wu Fan
Summary: The novel power generation system based on coal gasification in supercritical water shows great potential in meeting China's increasing energy demands. The stable and complete oxidation of hydrogen in the supercritical water oxidation reactor is crucial. Optimal design parameters for the reactor include diameter, axial length, and oxygen ratio. Analysis of enthalpy and exergy flow distributions revealed a total exergy destruction of only about 6.29%.
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
Engineering, Chemical
Guodong Yu, DeDong Hu
Summary: Supercritical water oxidation technology is an environmentally friendly method for treating refractory organic wastes. The main drawback is the high treatment cost, which hinders its large-scale application. This study optimized the SCWO process by constructing four wastewater treatment processes and using different oxidants and energy recovery methods. The results provide theoretical support for the industrialization of SCWO technology.
DESALINATION AND WATER TREATMENT
(2023)
Article
Thermodynamics
Chengcheng Luo, Huan Xi, Yong-Qiang Feng, Tzu-Chen Hung
Summary: This paper investigates a hybrid system based on the supercritical water oxidation (SCWO) system and performs parameter sensitivity analysis, exergy and economic analyses. The results show that the proposed system has higher electrical efficiency, heat efficiency as well as revenue from electricity and hot water.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Engineering, Environmental
Bingru Lu, Weizuo Wang, Cui Wang, Wenwen Wei, Hui Jin
Summary: Energy shortage and environmental pollution have led to the development of waste recycling and environment-friendly energy. A solar-driven gas-heat-electricity system was established to convert plastic waste and solar energy into electricity, heat, and hydrogen-rich gas. The analysis of the system's mass, energy, and exergy flow under typical conditions revealed the key factors affecting gasification performance, system efficiency, and energy output distribution.
CHEMICAL ENGINEERING JOURNAL
(2023)
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
Energy & Fuels
Huifang Feng, Jiajing Kou, Cui Wang, Hui Jin, Liejin Guo
Summary: This study investigated the evolution characteristics of three-phase products during supercritical water gasification (SCWG), revealing the mechanism of gasification reactions. The removal of functional groups from solid particles was found to decrease the gasification reactivity of char. The formation of hydrogen bonds by water led to coal structure decomposition and the production of CO and CO2 gases. H-2 and CH4 primarily originated from free radical collisions and polycondensation reactions. The presence of liquid intermediate components was quantitatively analyzed using high-performance liquid chromatography. The research findings are of great significance for controlling char formation, reducing the irreversibility of chemical reactions, and achieving large-scale industrial production.
Article
Thermodynamics
Fan Zhang, Shuzhong Wang, Yanhui Li, Wenjing Chen, Lili Qian
Summary: A novel supercritical water system was proposed to treat sewage sludge harmlessly in this work, utilizing supercritical water gasification and oxidation. The study found that increasing treatment temperature, reducing moisture content, and oxidation coefficient could significantly improve the energy efficiency of the system.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Yingfei Huang, Fengming Zhang, Zhaojian Liang, Yufeng Li, Tong Wu
Summary: Hydrothermal flames are utilized in different methods, including hot water injection, evaporation concentration, and addition of auxiliary fuel, to improve the performance of supercritical water oxidation (SCWO) systems for cutting fluid treatment. The simulations based on Aspen Plus 8.2 validate the proposed systems by comparing with experimental data. Results indicate that a low ratio between heat source flow and feed flow (FR) requires high heat source temperature and results in high electricity consumption. FR = 2 is considered as the optimum condition for SCWO system with hot water injection (SCWOH). Increasing concentration ratio and fuel concentration can effectively reduce the energy consumption for SCWO systems with evaporation concentration (SCWOE) and addition of auxiliary fuel (SCWOF), respectively. Exergy analysis reveals that most of the exergy inputs are destroyed inside the system, with exergy distribution coefficients of the reactor exceeding 80% in SCWOE and SCWOF. Economic analysis shows that SCWOE has the lowest treatment cost of 95.9 USD/t.
Article
Energy & Fuels
Huifang Feng, Jingli Sun, Hui Jin, Jiajing Kou, Liejin Guo
Summary: The study found that adding phenol can increase coal gasification efficiency and inhibit char formation, leading to an increased hydrogen yield. Phenol effectively suppresses char formation and enhances char reactivity.
Article
Environmental Sciences
Jianna Li, Shuzhong Wang, Lili Qian, Jie Zhang, Tiantian Xu, Yanhui Li, Donghai Xu
Summary: This study investigated the co-oxidation behavior between different ammonia-alcohol environments. Increasing temperature, oxidation coefficient, residence time, and alcohol concentration enhanced NH3-N and TOC degradation, while higher ammonia concentration inhibited TOC degradation. Alcohols were oxidized first in the system to generate more radicals, leading to significant ammonia removal.
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)