Article
Thermodynamics
Shihao Tang, Jia Wei, Bo Xie, Zhiwei Shi, Hao Wang, Xinghua Tian, Biao He, Qingguo Peng
Summary: To promote H2 combustion and enhance energy efficiency, a micro burner with multi-cavity is proposed and investigated through experiments and simulations. The effects of equivalence ratio, cavity settings, and operating conditions on flow field, species distribution, combustion characteristics, and heat transfer are analyzed. Results show that the burner with cavity improves combustion stability and outer wall temperature, with the highest temperature achieved at an equivalence ratio of 0.9. Additionally, the setting of cavities affects flame stretch, heat transfer, and radiation temperature, highlighting the potential for further optimization through cavity modifications.
Article
Chemistry, Physical
Ziqiang He, Dugang Kang, Xiuquan Li, Fei Wang, Jingxiang You, Zongguo Xue, Qunfeng Zou
Summary: A novel micro burner with a slinky projection shape channel is proposed to improve the energy output and reduce NOx emission of the MTPV system. Numerical simulations with detailed H2/air reaction mechanisms and NOx generation mechanisms are conducted. The study investigates the effects of slinky projection amplitude, slinky projection fins number, and basic oscillating channel radius on energy conversion characteristics and NOx emission.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Abdelbasset Lachraf, Mohamed Si Ameur
Summary: This numerical study investigates the impact of equidistant trapezoidal ribs on premixed H2-air micro-combustion, focusing on rib height. The incorporation of trapezoidal ribs enhances mixing, promotes flame stability, and increases combustion efficiency. The study compares a backward-facing step micro combustor (MCSD) with micro combustors of varying rib heights: MCRD1 (0.5 mm), MCRD2 (0.6 mm), and MCRD3 (0.7 mm). The findings highlight the advantageous range of rib height in achieving an optimal balance between improved flame stabilization and satisfactory combustion efficiency.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
(2023)
Article
Green & Sustainable Science & Technology
Qingguo Peng, Bo Xie, Wenming Yang, Shihao Tang, Zhenwei Li, Peng Zhou, Ningkang Luo
Summary: The study found that a small porosity of porous medium can improve flame stability and heat transfer, but has adverse effects on component flow and flame propagation. The use of multi-PM-layers helps balance the opposing effects on fluidity and thermal performance, leading to higher combustion efficiency and radiation temperature.
Article
Thermodynamics
Wei Zuo, Yuntian Zhang, Qingqing Li, Jing Li, Zhu He
Summary: The study found that the micro-cylindrical combustor with cavity has better thermal performance compared to the one without cavity. By analyzing the effects of cavity length and depth, the optimal cavity size was determined, and it was concluded that the combustor with cavity has better potential for applications in micro-TPV systems.
Article
Thermodynamics
Hao Wang, Qingguo Peng, Xinghua Tian, Depeng Wei, Yaojie Tu, Huaqiang Xiao, Ruixue Yin, Guang Fu
Summary: This study investigates the combustion characteristics and thermal performance of pre-mixed hydrogen/air in micro tubes for micro-thermophotovoltaic under different operating conditions. It proposes a cylindrical stepped tube with rib/fins to enhance flame stability and energy efficiency. The numerical simulations and experimental tests demonstrate that the inserted rib and its location significantly impact the flame behavior, heat transfer, and radiation temperature.
APPLIED THERMAL ENGINEERING
(2023)
Article
Chemistry, Physical
Abdelbasset Lachraf, Mohamed Si Ameur
Summary: This paper presents a new design of micro combustor with trapezoidal ribs on its inner wall, which shows promising improvements in thermal performance. Numerical simulations demonstrate the favorable effects of the ribs on temperature distribution and flow residence time. The study also compares the performance of this design with a simple backward facing step micro combustor, highlighting the benefits of the trapezoidal ribs. The results provide valuable insights into heat transfer mechanisms and suggest optimal operating conditions for efficiency and reliability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Linhong Li, Guangyao Yang, Aiwu Fan
Summary: The study verified that a symmetrical configuration of micro-combustor can improve combustion efficiency and radiation efficiency, allowing it to operate at higher average velocities. Furthermore, as the average velocity increases, combustion efficiency decreases monotonically while radiation efficiency and radiant energy output increase first and then decrease.
Article
Chemistry, Physical
Bo Luo, Jingwei Chen, Jiaqiang E, Gaoliang Liao, Feng Zhang, Jiangjun Ding
Summary: In the context of the international energy crisis, the development of a microthermophotovoltaic system using hydrogen as combustion energy is urgent. To optimize the micro-combustor in the system, nozzle micro-combustors with five different channels are designed and numerically studied. The results show that the nozzle micro-combustor with constriction-expansion channel has the best performance, leading to the design of a new type of nozzle micro-combustor with segmented channel. Numerical studies indicate that segmented micro-combustors have better thermal performance compared to non-segmented micro-burners, making them more suitable for micro-thermophotovoltaic applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Depeng Wei, Qingguo Peng, Hao Wang, Xinghua Tian, Huaqiang Xiao, Hui Liu, Guang Fu
Summary: This study investigates the effects of CH4 addition, burner dimensions and parameters on the working performance of micro-thermophotovoltaic systems. The results show that appropriate CH4 addition can enhance the thermal performance of the burner, and both thinner and thicker block settings have a positive impact on achieving better working performance. Additionally, increasing the burner length extends the operating conditions and radiant area.
Article
Thermodynamics
Wei Zuo, Dexin Li, E. Jiaqiang, Yongfang Xia, Qingqing Li, Yifan Quan, Guangde Zhang
Summary: A hydrogen-fueled micro planar combustor with cavity is designed to achieve high energy output power and energy conversion efficiency for micro-thermophotovoltaic system. Numerical investigations show that the micro planar combustor with cavity can achieve higher and more uniform outer wall temperature. With the reduction of cavity length and outlet size, the energy output and energy conversion efficiency of MTPV increase, but the pressure loss also becomes larger. The optimal dimensionless cavity length and outlet size are found to be 3/9 and 5/7 x 1/3, respectively. Nickel is identified as the optimal solid wall material for higher energy conversion efficiency, reaching 3.86% at an inlet velocity of 5 m/s. Therefore, the micro planar combustor with cavity is more suitable for MTPV system with higher energy output and energy conversion efficiency.
Article
Thermodynamics
Wei Zuo, Zijie Wang, E. Jiaqiang, Qingqing Li, Qianju Cheng, Yinkun Wu, Kun Zhou
Summary: Optimizing the structure of micro combustors to enhance their thermal performance can effectively improve the output power and energy conversion efficiency of micro thermophotovoltaic systems. The introduction of a tube outlet can effectively increase the mean outer wall temperature and temperature uniformity of micro planar combustors, as well as the energy output and energy conversion efficiency of MTPV system, but it also leads to higher pressure loss. The energy output and energy conversion efficiency of MTPV system can be further increased by reducing the tube length and increasing the tube diameter, while the pressure loss decreases slowly. When nickel is used as the solid wall material, the energy output and energy conversion efficiency of MTPV system can reach 6.14 W and 3.54%, respectively.
Article
Chemistry, Physical
Ducduy Nguyen, Young Choi, Cheolwoong Park, Yongrae Kim, Jeongwoo Lee
Summary: Hydrogen energy technology has gained attention for its reliability and non-carbon products, but the backfire phenomenon limits power and torque in hydrogen internal combustion engines. Research has shown that turbochargers can enhance H2ICE power, but issues like exhaust backpressure and pumping losses persist. Supercharging engines can reduce pumping losses, but also requires additional power, affecting engine output.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Ziqiang He, Lei Zhang, Xiuquan Li, Jingxiang You, Zongguo Xue, Yunfei Yan
Summary: This study proposes a unique microcombustor for the MTPV system and investigates the influence of the slinky projection amplitude, slinky projection fins number, and basic oscillating channel radius on its performance. The results show that increasing the slinky projection amplitude and fins number can improve the external wall temperature. Furthermore, a basic oscillating channel radius of 1.5 mm is suggested.
Article
Chemistry, Physical
Yaosong Huang, Yanjun Chen
Summary: A novel technique combining numerical simulation and machine learning is proposed to optimize the combustor geometry of micro thermophotovoltaic system, improving combustion conditions and system performance. Numerical simulations are used to investigate the influences of combustor geometric parameters on flame shape and performance, and the artificial neural network is trained to determine the optimization success. The radiation power of the combustor is optimized to 34.51 W using only 197 data samples.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Erwei Leng, Yilin Guo, Yanshan Yin, Yun Yu, Xun Gong, Jingwei Chen, Yuan Xue, E. Jiaqiang
Summary: In this study, a combination of spectroscopic techniques was used to reveal the catalytic mechanism of KCl and CaCl2 on cellulose char evolution during slow pyrolysis, providing insights into the evolution of functional groups in pyrolysis char. The results of this research are significant for understanding biomass pyrolysis mechanism and industrial production of biochar.
Article
Energy & Fuels
Jiaqiang E, Lei Cai, Jintao Li, Jiangjun Ding, Jingwei Chen, Bo Luo
Summary: The study shows that in the catalytic combustor, homogeneous reactions are significantly weakened, resulting in higher and more uniform outer wall temperatures, better fluid mixing, and reduced temperature difference at the outer wall. Additionally, the catalytic combustor exhibits lower average flow velocity and pressure loss at an inlet velocity of 10 m/s.
Article
Energy & Fuels
E. Jiaqiang, Jinquan Luo, Dandan Han, Yan Tan, Changling Feng, Yuanwang Deng
Summary: In this study, the effects of different mass fractions of Pd and Pt catalysts and different test conditions on the light-off temperature in the regeneration process of a rotary diesel particulate filter were investigated using the CHEMKIN software. The results showed that Pd catalyst can significantly decrease the light-off temperature for volatile organic components and Pd-based catalysts had a higher effect on CH4 combustion compared to Pt-based catalysts. Pt-based catalysts with a 2.0% mass fraction exhibited the best light-off performance among all catalysts, with a conversion rate reaching 100% at 698 K. Additionally, Pd dispersion of around 70% resulted in the lowest light-off temperature.
Review
Energy & Fuels
Erwei Leng, Yilin Guo, Jingwei Chen, Shuai Liu, Jiaqiang E, Yuan Xue
Summary: This paper comprehensively reviews the pyrolysis of lignin, including mechanism, modeling, and the effects of inorganic species. It discusses the pyrolysis characteristics, depolymerization mechanism, and different types of models used, as well as the influences of alkali metals, alkaline earth metals, and transition metals on lignin pyrolysis. Challenges and prospects are also discussed in the last section of the article.
Article
Energy & Fuels
Lehan Chen, Yuanwang Deng, Wei Han, E. Jiaqiang, Chunhua Wang, Dandan Han, Changling Feng
Summary: The adsorption characteristic and diffusion properties of MOR, MFI, and CON zeolites used in hydrocarbon catcher were studied in this work. Numerical simulation results showed that CON zeolite has the best adsorption performance for benzene component, while MFI zeolite performs better for ethylene component. The study also revealed that high temperature has a significant impact on the adsorption capacity of zeolites.
Article
Energy & Fuels
Qingguo Peng, Jia Wei, Wenming Yang, E. Jiaqiang
Summary: The combustion characteristics and thermal performance of premixed H-2/C3H8/air in a micro planar combustor with a block insert were experimentally and numerically tested. The effects of hydrogen blended fraction, equivalence ratio, flow rate, and block width on flame stability and heat transfer were discussed and analyzed. The results showed that adding hydrogen improved combustion stability in the micro combustor, and the lowest hydrogen blending mole fraction for a steady flame of the premixed H-2/C3H8/air was obtained through experimental study.
Article
Energy & Fuels
Changling Feng, Yuanwang Deng, Yan Tan, Wei Han, Jiaqiang E, Lehan Chen, Dandan Han
Summary: By studying the application of ZSM-5 zeolite as a HC adsorbent in cold start emissions of gasoline engines, it was found that the adsorption efficiency was high in the first stage, but most of the adsorbed hydrocarbons were desorbed afterwards. The total adsorption efficiency in the whole cycle was 26.2%. The results showed that ZSM-5 had good adsorption performance for cold start of gasoline engines.
Article
Chemistry, Physical
Wei Zuo, Hongshuo Zhao, Jiaqiang E, Qingqing Li, Dexin Li
Summary: This study compares the thermal performance and flame stability of hydrogen-fueled micro tube combustors with backward facing step and with injector. The effects of diameter ratio on thermal performance and flame stability are analyzed and discussed. The results show that decreasing the diameter ratio can improve fluid and heat circulation, but it is not helpful for flame stabilization. However, the injector can enhance the thermal performance and improve flame stability under lower hydrogen/air equivalence ratio.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Chemistry, Physical
Jiaqiang E, Yaqian Mei, Changling Feng, Jiangjun Ding, Lei Cai, Bo Luo
Summary: With the development of technology, the demand for Power MEMS is increasing, traditional chemical batteries are not suitable for this field. Combustion of hydrogen and hydrocarbon fuels is a promising alternative, but micro combustion faces problems of instability and low efficiency. Therefore, improving flame stability and combustion efficiency in micro combustion is necessary.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Green & Sustainable Science & Technology
Yan Tan, Jiaqiang E, Jingwei Chen, Gaoliang Liao, Feng Zhang, Jintao Li
Summary: A three-dimensional mathematical model of premixed hydrogen/air mixtures in micro combustors with rearward-step structure is established in this study to achieve high and uniform wall temperature distribution. The effects of rearward-step structure and inlet velocity on combustion characteristics and thermal performance in the micro combustor are investigated. The results indicate that the rearward-step structure enhances combustion intensity and stabilizes the flame, but also increases the temperature non-uniformity of the outer wall in the micro combustor.
Article
Energy & Fuels
Qingguo Peng, Jiahao Ye, Yaojie Tu, Wenming Yang, Jiaqiang E, Zhuang Kang, Guang Fu
Summary: This study investigates the effects of premixed combustion and porous media setting on the flame stability and energy efficiency in micro combustion. Partially inserted porous media and larger combustor size promote combustion stability and broaden burning limits, while blending C3H8 inhibits these effects.
Article
Engineering, Environmental
Jingwei Chen, Yu Bai, Tian Meng, Qiteng Wang, Chenxi Wang, E. Jiaqiang
Summary: This study investigates the decomposition mechanisms of amoxicillin in supercritical water through molecular dynamics simulation. The results show that amoxicillin undergoes carbon ring opening, carbon chain breaking, and small molecular compound conversion in supercritical water. The OH radical plays a vital role in the decomposition process.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Changling Feng, Yuanwang Deng, Jiaqiang E, Dandan Han, Yan Tan, Xiaoyu Luo
Summary: The feasibility of ZSM-5 zeolite for controlling hydrocarbon emissions during the cold start period of a gasoline engine was studied. The results showed that ZSM-5 zeolite can effectively adsorb and reduce the emissions of the main hydrocarbons during cold start.
Review
Energy & Fuels
Zhiwei Shi, Qingguo Peng, Jiaqiang E, Bo Xie, Jia Wei, Ruixue Yin, Guang Fu
Summary: This article systematically reviews the modification methods of catalysts in selective catalytic reduction (SCR) technology, analyzes the effects of various catalyst parameters on denitrification efficiency, and discusses the influences of spatial structure on catalytic effect. Additionally, it compares the performance of catalysts with different components and summarizes the current problems in catalyst research. The development of NH3-SCR technology is also prospected.
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.
