Article
Thermodynamics
Luis I. Diez, Alexander Garcia-Mariaca, Paula Canalis, Eva Llera
Summary: The oxy-fuel combustion of two torrefied biomasses is experimentally investigated in this study. It is found that increasing the share of torrefied biomass leads to significantly higher burnout degrees and CO2 conversion rates. When torrefied biomass is used alone, the formation rates of NO are reduced. The best results are obtained with 25% H2O atmospheres in most cases.
Article
Energy & Fuels
Jianzheng Xu, Tao Song
Summary: This study conducted experiments and modeling on the CO2-gasification of rice husk char using a bed of red mud oxygen-carrier. The effects of oxygen carrier, temperature, and CO2 concentration were evaluated and modeled. The results showed that the red mud significantly enhanced the gasification of char. A model coupling the kinetics of char gasification and mass transfers within and surrounding the char was established and showed a good agreement with experimental results. The study also revealed the presence of mass transfer resistance within the char particle, which led to pore structure changes at a carbon conversion of about 0.3.
Article
Energy & Fuels
Zhenghong Zhao, Zewu Zhang, Xiaojian Zha, Ge Gao, Xiaoshan Li, Fan Wu, Cong Luo, Liqi Zhang
Summary: Moderate or intense low-oxy dilution oxy-fuel (MILD-oxy) combustion can synergistically reduce CO2 and NOx emissions. Numerical simulations show that increasing O2 concentration weakens flue gas recirculation and promotes combustion intensity. Dry recycle mode has a more uniform temperature distribution, while wet recycle mode achieves diffusion/kinetics-controlled MILD regime. Dry recycle mode slows down coal char burnout, while wet recycle mode has more potential in achieving low NOx emission.
Article
Energy & Fuels
Richard A. Newby, Dale L. Keairns, Robert W. Stevens
Summary: The objective of this study was to estimate the cost of commercial production of oxygen carriers (OCs) for large-scale application in the chemical looping combustion (CLC) power generation industry. Two production facility scenarios were considered, and two OC production techniques were addressed. The estimated OC product costs can be used to guide development and determine the maximum OC makeup rate for achieving a designated cost-of-electricity (COE) reduction goal.
Review
Energy & Fuels
Dunyu Liu, Chaoran Wang, Yunpei Fan, Qiuqi Liu, Xudong Wang, Kailong Xu, Jing Jin, Jingjing Ma, Jinchen Ma
Summary: Chemical looping combustion (CLC) of coal for carbon capture utilization and storage is an effective technology to reduce carbon emission. However, there is uncertainty in mercury emission from both air and fuel reactor. This paper aims to reveal the mechanisms for the transformation of mercury-related species.
Article
Energy & Fuels
Giovanny S. de Oliveira, Ciro E. S. Lobo, Carlos E. A. Padilha, Domingos F. S. Souza, Juan A. C. Ruiz
Summary: Brazil aims to reduce its CO2 emissions by utilizing glycerin in Chemical Looping Combustion (CLC). The study evaluates the feasibility of using glycerin in CLC and finds that the addition of ethanol improves combustion efficiency, while the addition of methanol reduces efficiency.
Article
Energy & Fuels
Yu Bao, Qingbo Yu, Huaqing Xie, Qin Qin, Yu Zhao
Summary: This paper investigates the effect of adding H-2 and CO to a syngas on oxy-MILD combustion. The results indicate that adding H-2 significantly reduces the minimum O-2 concentration required for achieving the MILD state while adding CO has little effect. Furthermore, the mixture containing H-2 and CO can be used as fuel for oxy-MILD combustion with a characteristic chemical time scale comparable to the turbulent time scale.
Article
Thermodynamics
Haodong Huang, Jinchen Ma, Haibo Zhao, Chuguang Zheng
Summary: This work investigates the behavior of coal-derived chlorine in chemical looping combustion (CLC) and the potential adverse impacts of primary gaseous chlorine (HCl) on a Cu-based oxygen carrier (OC). The inactivation mechanism of the sol-gel-derived CuO/Al2O3 OC is studied. It is found that HCl is the main gaseous chlorine in coal CLC and shows high reactivity towards CuO. The presence of HCl can result in corrosion and degradation of the OC.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Energy & Fuels
Michael High, Clemens F. Patzschke, Liya Zheng, Dewang Zeng, Rui Xiao, Paul S. Fennell, Qilei Song
Summary: Chemical-looping combustion (CLC) using metal oxides as oxygen carriers for fossil fuel combustion has been found to be promising. In this study, Cu-based mixed oxides derived from hydrotalcite were used as oxygen carriers for the combustion of solid fuels. The Cu-based oxygen carriers showed high performance and thermal stability, with reversible oxygen release and storage over multiple redox cycles. Slight deactivation and sintering were observed at a very high operation temperature.
Article
Energy & Fuels
Bo Leckner
Summary: This article introduces the application of oxy-combustion by flue-gas recirculation for CO2 capture in an existing biomass-fired circulating fluidized bed boiler, which is already CO2-neutral. The article suggests using oxygen produced together with hydrogen in electrolysis by excess wind and solar power as an alternative to the commonly used air separation method.
Article
Engineering, Environmental
Daofeng Mei, Carl Linderholm, Anders Lyngfelt
Summary: In the process of Chemical Looping Combustion (CLC), further conversion of unconverted fuel gases is necessary to achieve complete combustion. Experimental results demonstrate that adding oxygen to the post-oxidation chamber (POC) can significantly enhance the oxidation efficiency of fuel gases, leading to higher gas conversion rates.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Felix Donat, Agnieszka Kierzkowska, Christoph R. Muller
Summary: In chemical looping, using Fe and Co as the main and side reaction metals can effectively reduce the extent of carbon deposition and improve the catalytic effect of oxygen carriers on methane decomposition.
Review
Environmental Sciences
Hayder A. Alalwan, Alaa H. Alminshid
Summary: This report discusses recent advancements in CO2 capturing methods, with a focus on chemical looping combustion (CLC) as a promising technology. CLC is highlighted for its ability to reduce the cost of CO2 separation and concentrate the captured CO2, making it a feasible option for carbon capture.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Applied
Minkyu Kim, Boseok Seo, Jinho Boo, Huiju Jung, No-Kuk Park, Ho-Jung Ryu, Jeom-In Baek, Misook Kang, Sung Bong Kang, Dohyung Kang
Summary: Chemical looping combustion technology is a popular research topic due to its ability to efficiently convert fossil fuels into sustainable energy with carbon capture. This study focused on the methane oxidation on Mn-Cu bimetallic oxygen carriers and explored the effects of dopants on their performance. Computational and experimental results showed that Ni-doped CuMn2O4 improved the oxygen transfer rate, while V-doped CuMn2O4 had a lower rate due to hindered oxygen migration. These findings highlight the importance of considering dopants' effects on oxygen migration when designing enhanced oxygen carriers.
Article
Energy & Fuels
Changsheng Bu, Xu Zhao, Bo Leckner, Alberto Gomez-Barea, Daoyin Liu, Junguang Meng, Changqi Liu, Xinye Wang, Jubing Zhang, Guilin Piao
Summary: Adding active oxygen carriers to the inert bed material improves oxygen distribution in fluidized bed combustors. This method, known as Oxygen-carrier-aided combustion (OCAC), has been used in air combustion in FB boilers and shows potential for oxy-fuel combustion. Experimental analysis of OCAC in oxy-fuel combustion was conducted using different coals and oxygen carriers. The results demonstrate that the burnout temperature decreases with oxygen carriers, while ignition temperature remains stable. The effect of oxygen carriers on char combustion rate follows the sequence: steel slag < hematite < AR-Fe2O3, with stronger effects observed for lower rank fuels. Combustion kinetics of chars using oxygen carriers exhibit higher activation energy and pre-exponential factor compared to pure char, indicating enhanced oxygen transport to the carbon surface.
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
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
Computer Science, Artificial Intelligence
Dongdong Zhang, Wenguo Xiang, Qiwei Cao, Shiyi Chen
Summary: An incremental support vector regression model optimized by particle swarm optimization algorithm is proposed for sensor faults online diagnosis. Experimental results show that the model has superior performance in model response time and convergence performance.
APPLIED INTELLIGENCE
(2021)
Article
Thermodynamics
Hai Zhao, Puzhen Gao, Xiaochang Li, Ruifeng Tian, Hongyang Wei, Sichao Tan
Summary: This study numerically investigates the interaction between flow-induced vibration and forced convection heat transfer in a tube bundle. The results show that the impact of flow-induced vibration on heat transfer varies in different flow velocity regions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rohit Chintala, Jon Winkler, Sugirdhalakshmi Ramaraj, Xin Jin
Summary: The current state of fault detection and diagnosis for residential air-conditioning systems is expensive and not suitable for widespread implementation. This paper proposes a cost-effective solution by introducing an automated fault detection algorithm as a screening step before more expensive tests can be conducted. The algorithm uses home thermostats and local weather information to identify thermodynamic parameters and detect high-impact air-conditioning faults.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
A. Azimi, N. Basiri, M. Eslami
Summary: This paper presents a novel optimization algorithm for improving the water-film cooling system of photovoltaic panels, resulting in a significant increase in net energy generation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Duc-Thuan Phung, Chin-Hsiang Cheng
Summary: In this study, a novel CFDMD model is used to analyze and investigate the behavior of thermal-lag engines (TLE). The study shows that the CFDMD model effectively captures the thermodynamic behavior of the working gas and the dynamic behavior of the engine mechanism. Additionally, the study explores the temporal evolution of engine speed and the influence of various parameters on shaft power and brake thermal efficiency. The research also reveals the existence of a thermal-lag phenomenon in TLE.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Haiying Yang, Yinjie Shen, Lin Li, Yichen Pan, Ping Yang
Summary: The purpose of this article is to find a measure to improve the interfacial thermal transfer of graphene/silicon heterojunction. Through molecular dynamics simulation, it is found that surface modification can significantly reduce the thermal resistance, thereby improving the thermal conductivity of the graphene/silicon interface.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Qiong Wu, Yancheng Wang, Haonan Zhou, Xingye Qiu, Deqing Mei
Summary: This article introduces a visible methanol steam reforming microreactor, which uses an optical crystal as an observation window and measures the reaction temperature in real-time using infrared thermography. The results show that under lower oxygen to carbon ratio conditions, the microreactor has a higher heating rate and a stable gradient in temperature distribution.
APPLIED THERMAL ENGINEERING
(2024)
Review
Thermodynamics
Giulia Manco, Umberto Tesio, Elisa Guelpa, Vittorio Verda
Summary: In the past decade, there has been a growing interest in studying energy systems for the combined management of power vectors. Most of the published works focus on finding the optimal design and operations of Multi Energy Systems (MES). However, for newcomers to this field, understanding how to achieve the desired optimization details while controlling computational expenses can be challenging and time-consuming. This paper presents a novel approach to analyzing the existing literature on MES, with the aim of guiding practical development of MES optimization. Through the discussion of six case studies, the authors provide a mathematical formulation as a reference for building the model and emphasize the impact of different aspects on the problem nature and solver selection. In addition, the paper also discusses the different approaches used in the literature for incorporating thermal networks and storage in the optimization of multi-energy systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xuepeng Yuan, Caiman Yan, Yunxian Huang, Yong Tang, Shiwei Zhang, Gong Chen
Summary: In this study, a multi-scale microgroove wick (MSMGW) was developed by laser irradiation, which demonstrated superior capillary performance. The surface morphology and performance of the wick were affected by laser scan pitch, laser power, repetition frequency, and scanning speed. The MSMGW showed optimal capillary performance in alumina material and DI water as the working fluid.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Maofei Mei, Feng Hu, Chong Han
Summary: This paper proposes an effective local search method based on detection of droplet boundaries for understanding the dynamic process of droplet growth during dropwise condensation. The method is validated by comparing with experimental data. The present simulation provides an effective approach to more accurately predict the nucleation site density in future studies.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rahul Kumar Sharma, Ashish Kumar, Dibakar Rakshit
Summary: The study explores the use of phase change materials (PCM) as a retrofit with Heating Ventilation and Air-conditioning systems (HVAC) to reduce energy consumption and improve air quality. By incorporating PCM with specific thickness and fin configurations, significant energy savings can be achieved in comparison to standard HVAC systems utilizing R134a. This research provides policymakers with energy-efficient and sustainable solutions for HVAC systems to combat climate change.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhenhua Ren, Xiangjin Meng, Xingang Qi, Hui Jin, Yunan Chen, Bin Chen, Liejin Guo
Summary: This paper investigates the heat transfer mechanism and factors influencing thermal radiation in the process of supercritical water gasification (SCWG) of coal, and proposes a comprehensive numerical model to simulate the process. Experimental validation results show that thermal radiation accounts for a significant proportion of the total heat exchange in the reactor and a large amount of radiant energy exists in the important spectral range of supercritical water. Enhancing radiative heat transfer can effectively increase the temperature of the reaction medium and the gasification rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mauro Abela, Mauro Mameli, Sauro Filippeschi, Brent S. Taft
Summary: Pulsating Heat Pipes (PHP) are passive two-phase heat transfer devices with a simple structure and high heat transfer capabilities. The actual unpredictability of their dynamic behavior during startup and thermal crisis hinders their large-scale application. An experimental apparatus is designed to investigate these phenomena systematically. The results show that increasing the number of evaporator sections and condenser temperature improves the performance of PHP. The condenser temperature also affects the initial liquid phase distribution and startup time.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xinyi Zhang, Shuzhong Wang, Daihui Jiang, Zhiqiang Wu
Summary: This study focuses on recovering waste heat from blast furnace slag using dry centrifugal pelletizing technology. A comprehensive two-dimensional model was developed to analyze heat transfer dynamics and investigate factors influencing heat exchange efficiency. The findings have important implications for optimizing waste heat recovery and ensuring safe operations.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xincheng Wu, An Zou, Qiang Zhang, Zhaoguang Wang
Summary: The boosting heat generation rate of high-performance processors is challenging traditional cooling techniques. This study proposes a combined design of active jet intermittency and passive surface modification to enhance heat transfer.
APPLIED THERMAL ENGINEERING
(2024)
