Article
Energy & Fuels
Jicang Si, Guochang Wang, Ziyun Shu, Xiangtao Liu, Mengwei Wu, Rong Zhu, Jianchun Mi
Summary: This study investigates the effects of different diluents and oxygen concentrations on MILD oxy-combustion, finding that CO2 and H2O dilutions are more beneficial for flameless combustion, while N2 is superior for stable combustion at low oxygen levels. N2 dilution leads to high NOx emissions, while CO2 and H2O dilutions result in lower emissions and more uniform heat transfer characteristics. Additionally, the criteria for flameless MILD combustion proposed by Cavaliere and de Joannon and Wiinning and Wiinning are found to apply under CO2 and H2O dilutions but not under N2 dilution for high oxygen concentrations.
Article
Engineering, Environmental
Jing Xu, Guofeng Shen, Bo Fu, Yunman Han, Xinhao Suo, Zhiwei Chen, Yuqin Lai, Jingyi Li, Longsheng Li, Luchao Han, Shu Tao, Bengang Li
Summary: The biogeochemistry of phosphorus strongly affects the primary productivity of ecosystems, but the global P budget is imbalanced. This study evaluated P emissions from combustion sources and found that a significant fraction of P is released into the air, with varying proportions depending on the fuel type. This discovery of gaseous P emissions is crucial for reducing uncertainties in the imbalanced P budget.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2023)
Article
Energy & Fuels
Zachary Harris, Joshua Bittle, Ajay Agrawal
Summary: Advanced engine design and alternative fuels allow for fuel injection at supercritical conditions, however, the boundary conditions for accurate simulation are critical. The flow inside the injector itself is often omitted, and simplified boundary treatments are used. This study uses computational fluid dynamics to analyze fuel-air mixing at supercritical conditions and highlights the importance of accurate boundary conditions for reliable predictions.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Energy & Fuels
Guo Ren Mong, Meng-Choung Chiong, Cheng Tung Chong, Jo-Han Ng, Syed Mashruk, Manh-Vu Tran, Kiat Moon Lee, Nor Afzanizam Samiran, Keng Yinn Wong, Agustin Valera-Medina
Summary: Ammonia has been identified as a viable energy vector for power generation. This study examined the swirl combustion characteristics of fuel-lean premixed ammonia/biogas via a numerical approach. The presence of carbon dioxide in the biogas was found to lower the peak flame temperature and Damkohler number, while aggravating the deformation of flame temperature radial profiles. However, it also intensified flow fluctuation and directed the premixed combustion into the thin reaction flamelets zone, resulting in elevated flame turbulent propagating speed and flow velocities.
Article
Energy & Fuels
Bingchao Zhao, Xiaoyong Song, Han Wang, Sabariswaran Kandasamy, Arunachalam Chinnathambi, Tahani Awad Alahmadi, Govindasamy Sathiyan, Nguyen Thuy Lan Chi, Rajasree Shanmuganathan
Summary: This study examines the influence of biohydrogen gas on the emissions and performance of a diesel engine. The results show that adding biohydrogen gas can reduce the concentrations of CO, CO2, and NOx in the exhaust, while increasing the brake thermal efficiency and heat release rate of the engine. However, the brake specific fuel consumption is higher due to energy discrepancy.
Article
Energy & Fuels
Mustafa Ilbas, Nurhan Uregen Guler, Murat Sahin
Summary: This study focuses on the combustion characteristics of biogas under different oxidizers in a swirl combustor. The results show similar trends in temperature distributions between experimental measurements and numerical predictions when using different oxidizers. Combustion using 100% O2 is found to have higher temperature values, starting faster and more efficiently.
Article
Chemistry, Physical
B. Kanimozhi, Govind Kumar, Mishal Alsehli, Ashraf Elfasakhany, Dhinakaran Veeman, Santhosh Balaji, Thanu Thiran, T. R. Praveen Kumar, Manigandan Sekar
Summary: The main purpose of this study is to analyze the effects of oxy hydrogen (HHO) along with the Moringa oleifera biodiesel blend on engine performance, combustion, and emission characteristics. The results show that adding HHO gas to the blend can reduce fuel consumption and the concentration of CO, HC, and CO2 emissions, but does not reduce the formation of NO. However, adding HHO to the biodiesel can significantly reduce the average NOx.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Sudarshan Gowrishankar, Anand Krishnasamy
Summary: Simultaneous reduction in NOx and smoke emissions is achieved with biodiesel under late-injection based low temperature combustion (LTC) strategy, but it leads to a substantial increase in unburned HC and CO emissions. This study aims to understand the reasons behind the formation of these emissions by comparing with conventional combustion and utilizing 3D CFD simulation.
Article
Energy & Fuels
Xu Wen, Hendrik Nicolai, Oliver T. Stein, Johannes Janicka, Andreas Kronenburg, Christian Hasse
Summary: The study investigated the effects of air and oxy-fuel atmospheres on flamelet modeling of NOx and SOx formation in coal flames. Two different methods for prediction of pollutant species were evaluated, with M1 showing better performance than M2. The results indicated that the interpolation error of reaction source terms in the middle branch of the S-Shaped curve contributed to the incorrect prediction of pollutant species.
Article
Polymer Science
Quan Wang, Wenbing Wang, Weicheng Qu, Wenmin Pang, Muhammad Qasim, Chen Zou
Summary: This study successfully synthesized two novel cationic nickel catalysts and supported them on solid supports to prepare heterogeneous catalysts. These catalysts showed high activity and thermal stability in ethylene polymerization, with significantly improved polymerization parameters. Moreover, these catalysts also enabled copolymerization of ethylene with a series of polar comonomers.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Energy & Fuels
Mengdi Pan, Manja Luzi-Helbing, Judith M. Schicks
Summary: Natural gas hydrates are crystalline solids composed of water and gas molecules. The structure and composition of these hydrates vary depending on the source of the gas. Recent studies have reported the existence of coexisting hydrate phases with different structures and compositions in natural gas hydrate reservoirs. Raman spectroscopy analysis showed fluctuations in cage occupancy and composition within individual crystals, but no evidence of coexisting phases. Experimental results indicated that coexisting phases may form when an initial methane hydrate phase reacts with a mixture.
Article
Chemistry, Applied
Joudia Akil, Carmen Ciotonea, Stephane Siffert, Sebastien Royer, Laurence Pirault-Roy, Renaud Cousin, Christophe Poupin
Summary: Oxyfuel combustion technology produces CO2 rich effluents that require increased purity due to the presence of CO and NOx. Cobalt-aluminum mixed oxide catalyst shows the best performance for NO-CO abatement, with the presence of water affecting catalyst activity and stability over time on stream.
Article
Energy & Fuels
Pu Hong, Lin Li, Yuanqiang Duan, Yueming Wang, Lunbo Duan
Summary: Oxy-fuel combustion is an important means of reducing CO2 emissions in coal-fired power plants. This study explores the influence of the gasification reaction on oxy-fuel combustion and decouples the contribution ratio of the gasification reaction. The results show that increasing pressure, temperature, and oxygen concentration promotes the combustion process and increases the combustion rate. The problem of low combustion rate in oxy-fuel combustion can be solved by increasing the O2 concentration.
Article
Thermodynamics
Harish Venu, V. Dhana Raju, S. Lingesan, Manzoore Elahi M. Soudagar
Summary: The research shows that adding 20 ppm alumina nano additive in ternary fuel blend can enhance engine performance and combustion efficiency, while reducing exhaust emissions.
Article
Thermodynamics
Manida Tongroon, Sathaporn Chuepeng
Summary: This study compared the emissions and heat release patterns of a premixed diesel engine using gasoline and ethanol as supplementary fuels. The results showed that gasoline premixture had higher thermal efficiency, while ethanol premixture had lower thermal efficiency. Increasing the ratio of supplementary fuel delayed the combustion phasing and reduced the quantities of nitrogen oxides, smoke, and total unburned hydrocarbon, but increased carbon monoxide emissions. Ethanol-diesel dual fuel had advantages in terms of smoke opacity but had a nitrogen oxides trade-off.
Article
Thermodynamics
Xujun Chen, Hongwei Wu
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Thermodynamics
Chao Feng, Hongwei Wu
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Thermodynamics
Hongwei Wu, Yi Li
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Thermodynamics
Xujun Chen, Sui Boon Liaw, Hongwei Wu
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Energy & Fuels
Sui Boon Liaw, Hongwei Wu
Article
Energy & Fuels
Changya Deng, Sui Boon Liaw, Hongwei Wu
Article
Energy & Fuels
Song Zhou, Tahereh Hosseini, Jie Zhao, Xiwang Zhang, Hongwei Wu, Lian Zhang
Article
Energy & Fuels
Bing Song, Yun Yu, Hongwei Wu
Review
Agricultural Engineering
Samreen Hameed, Abhishek Sharma, Vishnu Pareek, Hongwei Wu, Yun Yu
BIOMASS & BIOENERGY
(2019)
Article
Energy & Fuels
Qiqing Shen, Sui Boon Liaw, Mario Costa, Hongwei Wu
Article
Thermodynamics
Jinxiu Cao, Sui Boon Liaw, Yu Long, Yun Yu, Hongwei Wu
Summary: This study aims to understand the fundamental reaction mechanisms during fast pyrolysis of acid-impregnated cellulose, showing how different temperatures affect the formation of key compounds in the reaction intermediates and primary volatiles. The results indicate that acid impregnation reduces the onset reaction temperature of cellulose pyrolysis, leading to the production of different major products at varying temperatures. The study also suggests that condensation reactions play an important role during acid-catalysed cellulose pyrolysis, with char formation becoming the favored pathway at higher temperatures.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Thermodynamics
Sui Boon Liaw, Hongwei Wu
Summary: Laboratory-scale experiments on PF combustion are usually conducted in droptube furnaces, investigating the effect of flue gas cooling conditions on PM10 properties from biomass combustion. The study found that cooling rate and biomass feeding rate have significant impacts on particle size and composition, showing different trends in particle diameter and component distribution.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Energy & Fuels
Qiqing Shen, Sui Boon Liaw, Hongwei Wu
Summary: Rapid pyrolysis of mallee and pine wood particles was conducted in a drop-tube furnace to investigate char yield, evolution of AAEM species, and char particle morphology. The results showed that char yield decreased with particle residence time, and mallee wood exhibited stronger resistance to deformation compared to pine wood due to the maintenance of its original elongated shape.