Article
Energy & Fuels
Shengquan Zhou, Xiaochao Zhu, Beibei Yan, Qiang Gao, Guanyi Chen, Bo Li
Summary: Biomass gasification is a promising clean technology, but the gasified gas from biomass faces challenges in actual utilization. Utilizing moderate or intense low oxygen dilution (MILD) combustion can reduce CO and NOx emissions from biomass gasified gas. The MILD combustion of biomass gasified gas can be established using a hot coflow generated by a non-premixed flame.
Article
Energy & Fuels
Pikai Zhang, Huangwei Zhang, Yun Feng Zhang
Summary: This study investigates the kinetic characteristics of char ignition and finds that ignition time is affected by various factors, while ignition temperature is mainly influenced by equivalence ratio. Under fuel-rich conditions, the combustion process experiences a thermal runaway and a decay stage. The study also explores the factors affecting the heat release rate peak in detail.
Article
Energy & Fuels
D. S. Romanov, V. V. Dorokhov, K. Yu. Vershinina, P. A. Strizhak
Summary: The paper investigates the influence of stabilizing additives on the properties of fuel slurries derived from coal slime. Different additives were tested and compared, and it was found that they can effectively reduce the proportion of separated liquid, lower the ignition temperature, and accelerate the ignition process. Waste turbine oil and sodium lignosulfonate were the most effective additives. In terms of feasibility, the cost of preparing a slurry from coal slime is higher compared to using bituminous coal, but the payback period for other fuels is shorter.
Article
Thermodynamics
Kseniya Vershinina, Sergei Shevyrev, Pavel Strizhak
Summary: This study introduces the potential of slurry fuels based on coal and waste oil, providing a database of promising components for predicting combustion conditions in power plants. Analysis of high-potential components helps in selecting combustible components with high relative efficiency.
Article
Energy & Fuels
Hui Wang, Hanhui Liu, Kaixiang Zhao, Hairui Yang, Jun Chen
Summary: This study investigated the influence of temperature and sawdust mixing ratio on the combustion characteristics of a mixed sample of Shanxi Lvliang Lin Xian coal slime and sawdust, as well as the sintering characteristics of the sample. The results showed that increasing the furnace temperature or increasing the proportion of sawdust accelerated the combustion process of the mixed sample and reduced the ignition delay and burnout time.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Chemistry, Multidisciplinary
Wenshi Huang, Yuxin Wu, Lele Feng, Hai Zhang
Summary: Moderate or intense low-oxygen dilution (MILD) combustion of pulverized coal has great potential in reducing NOx emission and improving heat flux uniformity. Increasing the jet velocity is an important means to achieve MILD oxy-coal combustion, but the transition mechanism of coal combustion modes with the increase of jet velocity is not clear enough. This study designed a high-velocity coal-laden jet combustion system to investigate the effects of jet velocity on MILD combustion formation of pulverized coal. The theoretical criteria for combustion mode were applied and validated by experimental data. The study also analyzed the key factors, including the dilution effect, jet entrainment, and turbulent mixing, which contribute to achieving the MILD combustion regime.
Article
Energy & Fuels
Ziqu Ouyang, Hongliang Ding, Wen Liu, Shiyuan Li, Xiaoyang Cao
Summary: The study demonstrates the potential of coal self-preheating combustion technology in reducing NOx emissions, especially with specific jet nozzles. Preheated fuel can achieve flameless combustion, resulting in significantly lower NOx emissions.
Article
Energy & Fuels
Hongliang Ding, Ziqu Ouyang, Xiaoyu Zhang, Shujun Zhu
Summary: The experiments showed that the particle size of Shenmu semi-coke significantly affected the composition yield, coal char activity, combustion process, and NOx emissions of high-temperature coal gas. Specifically, a particle size of 163.84 μm led to the highest combustion efficiency of 98.23% with flameless combustion achieved. Additionally, a critical value of 198.54 μm for Shenmu semi-coke particles was identified, affecting NOx emissions.
Article
Chemistry, Multidisciplinary
Jianguo Liu, Zihao Zhou, Longzhe Jin, Tianyang Wang, Shengnan Ou, Shu Wang, Yixuan Wei, Mulati Jueraiti
Summary: This study investigates the impact of coal dust content on the low-temperature oxidation (LTO) characteristics of coal samples in silos. The results show that increasing the coal dust content enhances the oxygen consumption and carbon monoxide generation rates, as well as the LTO capacity. Additionally, decreasing the particle size of the coal samples advances their LTO process. Therefore, controlling the coal dust content effectively reduces the risk of LTO and spontaneous combustion in silo coal.
Article
Chemistry, Multidisciplinary
Olesya P. Stebeleva, Ludmila V. Kashkina, Andrey V. Minakov, Olga A. Vshivkova
Summary: It is common to use coal as a raw material in heat power engineering. However, the ignitability of coal cannot be easily eliminated. Using water-slurry-based coal-water fuel (CWF) instead of coal solves this problem. The rheological and sedimentation properties, combustion parameters, and emissions of CWF have been studied. The cavitation method of producing CWF improves fuel properties and reduces emissions.
Article
Environmental Sciences
Yanlin Wang, Li Jia, Baihe Guo, Xin Shen, Xin Zheng, Jun Xiang, Yan Jin
Summary: This paper investigates the co-combustion characteristics and NO/SO2 emission behavior of sewage sludge (SS) and coal slime (CS). The study reveals significant interactions between SS and CS during co-combustion and explores the mechanisms behind these interactions. The results demonstrate the influence of both non-catalytic factors and catalytic factors on the combustion characteristics, and the effect of co-combustion temperature and CS ratio on NO and SO2 emission characteristics. The findings also shed light on the reduction of NO facilitated by reducing gases released by SS combustion and the reduction of SS-NO by char formed by CS.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Thermodynamics
Douglas B. Proud, Michael J. Evans, Paul R. Medwell, Qing N. Chan
Summary: The study investigated the combustion of liquid fuels in hot and low-oxygen environments by injecting them as dilute sprays into a reaction zone. Laser diagnostic techniques were used to analyze resulting flames, revealing the presence of distinct inner and outer reaction zones affected by air-fuel premixing and droplet penetration. Variations in fuel type influenced the stability of inner flame front, with bifurcation observed in ethanol flame and ignition kernels in n-heptane and n-heptane/toluene flames.
COMBUSTION AND FLAME
(2021)
Article
Chemistry, Applied
Yonghong Yan, Rui Sun, Liutao Sun, Wenkun Zhu, Dengke Chen
Summary: This study evaluated the effect of primary air velocity on the ignition characteristics of bituminous coal and semicoke mixture, indicating that convection heating was more important than radiant heating for fuel ignition. The optimized flame stability was achieved at a primary air velocity of 18 m/s, and a recommended PAV of no more than 22 m/s for co-firing bituminous coal with a large proportion of semicoke.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Yanlin Wang, Li Jia, Liu Zhang, Xin Zheng, Jun Xiang, Yan Jin
Summary: The co-combustion of sewage sludge and coal slime is a promising method for the harmless disposal of these two solid wastes. The minerals in sewage sludge have significant effects on the combustion of coal slime during co-combustion. Both single and composite minerals have influences on the combustion of coal slime, and the composite minerals can synergistically catalyze the combustion. The kinetic results show that the minerals decrease the apparent activation energy of coal slime during fixed carbon combustion.
Article
Energy & Fuels
K. B. Larionov, K. V. Slyusarskiy, I. V. Mishakov, S. A. Tsibulskiy, R. B. Tabakaev, A. A. Vedyagin, A. A. Gromov
Summary: The combustion process of coal samples loaded with different copper salts was studied in this research. It was found that the addition of copper salts decreased the ignition delay time, lowered the minimum ignition temperature, and reduced the formation of CO, leading to more complete oxidation of the fuel with the generation of CO2.
Article
Energy & Fuels
Wei Fu, Fengyu Li, Yanju Liu, Kesheng Meng, Qizhao Lin
Summary: The objective of this paper is to investigate the spray characteristics of diesel and biodiesel in different in-cylinder environments. Both ambient pressure and temperature have a significant effect on the spray characteristics of the fuels. Biodiesel exhibits different spray characteristics due to its different physical properties compared to diesel.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2023)
Article
Energy & Fuels
Haobo Bi, Chengxin Wang, Xuedan Jiang, Chunlong Jiang, Lin Bao, Qizhao Lin
Summary: This study proposed the co-combustion of sewage sludge and peanut shells to address energy shortage and waste accumulation issues. The research utilized ANN and TGA to investigate the combustion characteristics, finding that peanut shells have a lower combustion temperature range than sewage sludge. The study also established multiple ANN models to predict TG data of the co-combustion, with the best prediction model (ANN21) achieving good overlap with experimental data, showcasing the potential for promoting waste utilization and reduction.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Mechanics
Fengyu Li, Junjian Tian, Kai Han, Lin Bao, Kesheng Meng, Qizhao Lin
Summary: This paper investigates the expansion, micro-explosion, and combustion behaviors of base fuels blended with long-chain alcohols. It found that the proportion of alcohol can significantly impact ignition delay time and combustion rate. Biodiesel-based fuel offers the shortest ignition delay time and longest combustion duration, while aviation kerosene exhibits the opposite characteristics.
Article
Environmental Sciences
Haobo Bi, Chengxin Wang, Qizhao Lin, Xuedan Jiang, Chunlong Jiang, Lin Bao
Summary: The co-pyrolysis experiments of coal gangue and peanut shell were conducted using TG-FTIR and ICP-OES, with kinetic parameters calculated by model-free methods and an ANN model established for predicting thermogravimetric experimental data.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Mechanics
Fengyu Li, Qizhao Lin
Summary: The study focused on the impact of blending pentanol on the radial diffusion of biodiesel spray and its ability to improve radial diffusion capacity. The results showed that adding pentanol could enhance the radial diffusion ability of the spray, but it was also influenced by changes in ambient and injection pressures.
Article
Mechanics
Junjian Tian, Yu Liu, Fengyu Li, Kai Han, Wenliang Zhou, Qizhao Lin, Kesheng Meng
Summary: This study investigates the effects of octanol on the spray characteristics of biodiesel through experiments and model verification. Results show that increasing octanol content leads to changes in spray penetration, cone angle, velocity, and area. The modified model, which introduces density, viscosity, and correction factors, is more suitable for predicting the spray characteristics of blended fuel under high injection pressure.
Article
Mechanics
Yu Liu, Junjian Tian, Zhihui Song, Fengyu Li, Wenliang Zhou, Qizhao Lin
Summary: This study investigated the spray characteristics of biodiesel and polyoxymethylene dimethyl ethers (PODE) under different injection pressures. It was found that biodiesel blends have a greater spray tip penetration compared to diesel blends, and the addition of PODE brings the spray characteristics of biodiesel closer to pure diesel. An excellent predictive model was also developed using computer technology.
Article
Mechanics
Fengyu Li, Weidong Shi, Yang Yu, Yue Shu, Qizhao Lin
Summary: The study focuses on the velocity field and diameter distribution of long-chain alcohol-aviation kerosene transverse jets. It reveals that droplet size and shape factor are mainly affected by the Weber number of cross gas flow, and the droplet size increases first and then decreases with the increase in the volume fraction of long-chain alcohol. Additionally, the addition of long-chain alcohol reduces the range of particle sizes with the largest number density.
Article
Mechanics
Kesheng Meng, Zhiyong Huang, Xiaolei Zhang, Lan Li, Rui Li, Qizhao Lin
Summary: This study investigates the evaporation, micro-explosion, and interaction phenomena of a mixed fuel droplet group during heating. Experimental equipment is used to observe the biodiesel and ethanol droplet group with different component proportions. The results show that when the ratio of biodiesel to ethanol is 40:60, the micro-explosion intensity is the highest, and higher micro-explosion intensity leads to higher evaporation rate. A three-stage evaporation model is established, and it is found that the second stage has an average evaporation rate 28 times higher than the first stage and 32 times higher than the third stage.
Article
Mechanics
Kesheng Meng, Lan Li, Xiaolei Zhang, Zhiyong Huang, Fengsheng Wang, Rui Li, Qizhao Lin
Summary: This study compared the influence of temperature on the micro-explosion intensity and frequency of two droplet groups. It found that the droplet groups exhibited different characteristics and life cycles under different temperatures, and analyzed the reasons behind these changes. The study also established a frequency model for supermicro-explosion and analyzed the impact of combustion on it.
Article
Mechanics
Kai Han, Qizhao Lin, Minghou Liu, Kesheng Meng, Zhanshi Ni, Yu Liu, Junjian Tian
Summary: Using the single droplet suspension method, this study investigated the effect of nitrogen flow rate on the micro-explosion characteristics of different blended types of droplets in laminar flow conditions. Experimental results showed that the nitrogen flow rate had a greater impact on high-boiling fuel in low one (H/L) droplets compared to low-boiling fuel in high one (L/H) droplets. The micro-explosion intensity and number increased first and then decreased with the increase in nitrogen flow rate for most droplet compositions, except for B20M80. The study provided valuable insights for understanding the micro-explosion mechanism of different blended types of droplets in different flow regimes.
Article
Green & Sustainable Science & Technology
Kai Han, Qizhao Lin, Minghou Liu, Kesheng Meng, Zhanshi Ni, Yu Liu, Junjian Tian, Zhicong Qiu
Summary: This study aimed to investigate the effects of different 1-pentanol addition ratios on the micro-explosion characteristics of blended droplets. The results showed that the micro-explosion number and total micro-explosion intensity reached the maximum when the 1-pentanol volume content was 50%. Compared with biodiesel/1-pentanol blended droplets, biodiesel/methanol ones had better micro-explosion characteristics and shorter droplet lifetime.
Article
Thermodynamics
Zhicong Qiu, Junjian Tian, Yu Liu, Hao Sun, Zhanshi Ni, Qizhao Lin, Liqun He
Summary: In this study, the expansion and evaporation characteristics of ethanol-biodiesel mixed droplets were investigated under different coal slime particle content and different particle size using the single droplet suspension method. Experimental results showed that the addition of micron-sized slime particles increased the evaporation rate of the droplets. The total evaporation rate of the droplets increased with increasing slime particle content, with the shortest total evaporation time observed for fuel droplets containing 3% slime particles. The stable evaporation rate of the droplets first decreased and then increased, with the highest stable evaporation rate observed for droplets containing 1% coal slime particles. Furthermore, at the same particle content, droplets containing 60 μm slime particles exhibited the fastest evaporation rate.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Zhanshi Ni, Haobo Bi, Chunlong Jiang, Hao Sun, Wenliang Zhou, Zhicong Qiu, Liqun He, Qizhao Lin
Summary: Thermogravimetric-Fourier transform infrared spectrometry was used to investigate the co-pyrolysis of coal slime and lignin in this study. The composition and evolution of gaseous products during the pyrolysis process were analyzed, as well as the influence of lignin content. An artificial neural network prediction model with a relative error less than 2.5% was established.
Article
Energy & Fuels
Lifei Zhao, Junjian Tian, Fengyu Li, Duode Qian, Qizhao Lin
Summary: This study examines the spray characteristics of biodiesel, diethyl carbonate (DEC), and their mixtures in a common-rail injection system. The test results show that the spray pressure and ambient pressure have significant effects on the spray characteristics. Increasing the spray pressure and decreasing the ambient pressure can increase the spray tip penetration, decrease the spray cone angle, and increase the spray area.
JOURNAL OF ENERGY ENGINEERING
(2023)
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.
