Article
Energy & Fuels
Huiquan Duan, Ming Jia, Jinpeng Bai, Yaopeng Li
Summary: This study focuses on investigating the combined effects of fuel reactivity, phi-sensitivity, and intake temperature on low-temperature gasoline combustion. It found that lower intake temperature plays a greater role than higher reactivity of P20G80 under premixed operation, leading to lower combustion rate and NOx emissions. Meanwhile, the higher reactivity of P20G80 dominates the combustion process under fuel stratification operation, contributing to shorter burn duration. Gasoline/PODEn RCCI presents the highest efficiency while maintaining low NOx and soot emissions.
Article
Energy & Fuels
Huiquan Duan, Ming Jia, Hui Wang, Yaopeng Li, Guangqing Xia
Summary: This study investigates the control mechanism of fuel properties and intake temperature on the low-temperature PODEn/gasoline combustion. Two combustion modes, PPC and R-RCCI, were studied with different fuel regulating methods. The results show that increasing local fuel concentration is more effective in improving combustion efficiency and thermal efficiency in PPC, while the lower local temperature caused by the heat of vaporization of directly injected gasoline significantly influences the combustion process in R-RCCI. R-RCCI can effectively reduce combustion instability, combustion rate, and NOx emissions compared to PPC.
Article
Thermodynamics
Huiquan Duan, Ming Jia, Jinpeng Bai, Yaopeng Li
Summary: R-RCCI utilizes high-reactivity PODEn and low-reactivity P20G80 to increase combustion efficiency and reduce NOx emissions. By adjusting the start of injection timing, the injected fuel amount is increased, leading to improved combustion efficiency and ITE, while also effectively reducing NOx emissions.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2022)
Article
Thermodynamics
Bowen Li, Haoye Liu, Linjun Yu, Zhi Wang, Jianxin Wang
Summary: Polyoxymethylene dimethyl ethers have the potential to enhance engine performance and reduce emissions. This study demonstrated that using a blend of gasoline/diesel/polyoxymethylene dimethyl ethers fuel and multiple premixed compression ignition combustion mode can improve thermal efficiency significantly, with further enhancements achieved through the use of a fully variable valve system and a redesigned low-heat-transfer piston.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2021)
Article
Energy & Fuels
Binbin Yang, Leilei Liu, Shouke Jia, Fan Zhang, Mingfa Yao
Summary: The study found that under gasoline compression ignition (GCI) mode, the particle size distribution is mainly in nuclei-mode with the particle size distributed around 20 nm. Both with and without EGR, a unimodal distribution is observed. Advancing injection timing shifts the particle size distribution towards larger sizes.
Article
Energy & Fuels
Wenjun Zhong, Nasreldin M. Mahmoud, Qian Wang
Summary: This study utilized computational fluid dynamic simulation in a constant volume chamber to investigate the spray combustion and emission behavior of a biodiesel and gasoline blend, providing insights into combustion characteristics. A reduced kinetic mechanism for the blend and a multi-step phenomenological soot model were developed to accurately capture spray characteristics and soot formation under GCI engine conditions. The study also explored the effects of ambient oxygen level and temperature on flame structure and soot formation, offering valuable information for practical applications in GCI engines.
Article
Chemistry, Applied
Junheng Liu, Haoran Ma, Ping Sun, Pan Wang, Tianting Wang, Yuan Liu, Mingliang Wei, Jia Fang
Summary: This study investigates the cooperative control of particulate matter (PM) and nitrogen oxides (NOx) emissions from compression ignition engines using polyoxymethylene dimethyl ethers (PODE) and methanol as diesel alternative fuels. The results show that the addition of methanol increases combustion pressure, shortens combustion duration, and reduces NOx emissions and soot emission.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Xiao Ma, Yue Ma, Zhijian Wang, Jianshu Mao, Haoye Liu, Feifei Su, Jianxin Wang
Summary: In this study, a multi-time ignition mixed mode combustion (MIMC) strategy is proposed to improve the combustion of dual fuel. Gasoline and polyoxymethylene dimethyl ethers (PODE) are used as the premixed and pilot fuel. The MIMC strategy can achieve multi-time ignition using PODE's auto-ignition property and low sooting tendency. By controlling the ignition position and time, the MIMC strategy can speed up or slow down the combustion process.
Article
Thermodynamics
Junheng Liu, Haoran Ma, Wenwen Liang, Jun Yang, Ping Sun, Xidong Wang, Yongxu Wang, Pan Wang
Summary: The research found that as the MSR increases, the ignition delay of the dual-fuel engine increases, as does the COV, with different combustion characteristics under different loads.
Article
Chemistry, Physical
Binbin Yang, Leilei Liu, Yan Zhang, Fan Zhang, Tiezhu Zhang
Summary: This paper investigates the influence of reforming conditions on gasoline reforming products and the impact of main reforming products on GCI combustion at low-load conditions through experiments and numerical simulations. The results indicate that CO, H2, and CH4 are the major reforming products, which are enhanced by higher reforming temperature, oxygen concentration, and reforming time. The production of CO and H2 is mainly determined by the dehydrogenation reaction between fuel molecules and OH, while the reaction between iC8H18 and O2 is crucial for CH4 generation. Increases in CO addition significantly improve combustion efficiency, while the combustion efficiency initially increases and then decreases with increased H2, reaching a peak value of 96.71%. Additionally, using more internal exhaust gas recirculation (i-EGR) leads to higher combustion efficiency. The addition of CH4 enhances the OH and H radical production, further improving combustion efficiency.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Tiankui Zhu, Zhan Gao, Yuxiao Qiu, Xin Yan, Lei Zhu, Zhen Huang
Summary: Polyoxymethylene dimethyl ethers (PODE) and methanol show promise as alternative fuels for internal combustion engines. A modified gasoline engine was used to study the combustion characteristics of a dual-fuel SACI engine fueled with direct injection PODE and port injection methanol. The study analyzed the effects of PODE mass ratio, spark ignition timing, and start of injection timing. The results showed multiple heat-release stages during dual-fuel SACI combustion and demonstrated the potential for high brake thermal efficiency and low hydrocarbon emissions with the appropriate control of parameters.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Huiquan Duan, Ming Jia, Yaopeng Li, Tianyou Wang
Summary: The study investigated RCCI with reverse reactivity stratification (RRCCI) with gasoline and PODEn as fuels at low and medium loads in a light-duty compression-ignition engine. Results showed that R-RCCI has moderate combustion rate and efficiency, with the highest indicated thermal efficiency (ITE) and significantly lower NOx and soot emissions compared to PPC. R-RCCI also strikes a better balance between premixed combustion and combustion temperature, leading to very low soot emissions at low and medium loads.
Article
Energy & Fuels
Pengwei Zhang, Guangfu Xu, Yaopeng Li, Yikang Cai, Huiquan Duan, Ming Jia
Summary: By integrating three-dimensional CFD simulation and genetic algorithm, this study simultaneously explored the operating parameters and fuel composition of a GCI engine in the full load range. The optimized results indicated that the GCI strategy can achieve low NOx emissions, near-zero soot emissions, and satisfactory fuel consumption.
Article
Green & Sustainable Science & Technology
Marijan Markovic, Filip Juric, Dominik Pecaver Sosic, Carsten Schmalhorst, Anh Tuan Hoang, Milan Vujanovic
Summary: This study conducted numerical analysis on the use of trioxymethylene dimethyl ether (OME3) e-fuel as a viable replacement for diesel fuel in an industrial compression ignition engine. The results showed that by adjusting the injection timing in multi-injection cases, OME3 combustion can achieve higher mean pressure peaks compared to diesel fuel, while emitting lower levels of nitrogen oxides.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2023)
Article
Chemistry, Analytical
Xin Zhong, Hu Wang, Qingming Zuo, Zunqing Zheng, Jinglan Wang, Wenhao Yin, Mingfa Yao
Summary: Polyoxymethylene dimethyl ethers (DMMn) is considered a potential alternative fuel for transportation usage. The study investigates the pyrolysis of DMM1-3 in a jet stirred reactor (JSR) and reveals that the reactivity and initial pyrolysis temperature are significantly influenced by the increase of n in DMM1-3. Methane and methyl formate are key pyrolysis products affected by the fuel-specific chain initiation reactions. Competitive channels affecting formaldehyde production of DMM2 and DMM3 were also identified.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Energy & Fuels
Hu Wang, Xin Zhong, Shan Mi, Mingfa Yao
Article
Energy & Fuels
Yanqing Cui, Haifeng Liu, Chao Geng, Qinglong Tang, Lei Feng, Yu Wang, Wentao Yi, Zunqing Zheng, Mingfa Yao
Article
Energy & Fuels
Hu Wang, Hongyan Zhu, Tianyu Ma, Mingfa Yao
Article
Energy & Fuels
Qinglong Tang, Xinlei Liu, Haifeng Liu, Hu Wang, Mingfa Yao
Article
Thermodynamics
Xumin Zhao, Hu Wang, Daojian Liu, Zunqing Zheng, Mingfa Yao
Summary: Increasing octane sensitivity (OS) to reduce end-gas reactivity is conditional, becoming less sensitive with advancing spark timing (ST). The relationship between OS and fuel-specific properties shows that variations beyond OS are crucial in knock tendency when increasing compression ratio (CR). Ethanol Reference Fuels (ERFs) exhibit better knock resistance than Toluene Reference Fuels (TRFs) at high CR conditions due to lower autoignition temperature and more effective chemical and charge cooling effects.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Energy & Fuels
Hu Wang, Xin Zhong, Tianyu Ma, Zunqing Zheng, Mingfa Yao
Article
Energy & Fuels
Hongyan Zhu, Jianan Wei, Hu Wang, Mingfa Yao
Article
Energy & Fuels
Jianan Wei, Hongqing Feng, Haifeng Liu, Hongyan Zhu, Zongyu Yue, Mingfa Yao
Summary: The study showed that adding 10% ethanol to iso-octane can accelerate combustion speed with higher heat release rate and pressure rise rate after knocking onset. Additionally, blending methanol with iso-octane enhances knock intensity, particularly at a 30% blend ratio. The new parameter I, measuring the interaction between flame core and pressure wave, revealed that methanol induces more intense knock compared to iso-octane and ethanol.
Article
Energy & Fuels
Jingrui Li, Haifeng Liu, Xinlei Liu, Ying Ye, Hu Wang, Mingfa Yao
Summary: The study investigates the detailed combustion kinetics of a high-pressure direct injection natural gas marine engine, observing that an earlier NG start of injection timing results in a higher heat release rate with limited impact on the main representative exothermic reactions and dominant formation reactions of CH2O and OH.
Article
Energy & Fuels
Ying Ye, Zongyu Yue, Hu Wang, Haifeng Liu, Chaohui Wu, Mingfa Yao
Summary: This study investigates the multi-regime combustion in a dual-fuel marine engine, proposing a novel mapping approach that combines the well-stirred reactor (WSR) model with the G-equation model to balance high computational accuracy and efficiency.
Article
Energy & Fuels
Lei Feng, Xingyu Sun, Xiaoyan Pan, Wentao Yi, Yanqing Cui, Yu Wang, Mingsheng Wen, Zhenyang Ming, Haifeng Liu, Mingfa Yao
Summary: The study reveals that the liquid and vapor penetration lengths, as well as the mass of entrained gas of gasoline and diesel sprays, vary under different pressure conditions, while the mean equivalence ratio shows an increasing tendency under certain conditions.
Article
Chemistry, Analytical
Xin Zhong, Hu Wang, Qingming Zuo, Zunqing Zheng, Jinglan Wang, Wenhao Yin, Mingfa Yao
Summary: Polyoxymethylene dimethyl ethers (DMMn) is considered a potential alternative fuel for transportation usage. The study investigates the pyrolysis of DMM1-3 in a jet stirred reactor (JSR) and reveals that the reactivity and initial pyrolysis temperature are significantly influenced by the increase of n in DMM1-3. Methane and methyl formate are key pyrolysis products affected by the fuel-specific chain initiation reactions. Competitive channels affecting formaldehyde production of DMM2 and DMM3 were also identified.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Energy & Fuels
Lina Xu, Gang Li, Mingfa Yao, Zunqing Zheng, Hu Wang
Summary: This study numerically investigates the effects of charge concentration stratifications inside the prechamber on the jet characteristics and combustion process. The results show that the jet characteristics and ignition mechanisms can be regulated by controlling the prechamber global equivalence ratio and spark timing.
Article
Thermodynamics
Xumin Zhao, Ruilin Liu, Zunqing Zheng, Peng Chen, Hu Wang, Guangmeng Zhou, Zhongjie Zhang, Mingfa Yao
Summary: This study focuses on the interaction of charge motion and EGR on anti-knock performance and thermal efficiency of medium duty gasoline engines. The results show that the inclined swirl scheme can enhance the effectiveness of EGR in knock suppression at low-medium load, and increase the EGR tolerance at medium-high load, thus improving the thermal efficiency. The scheme adopting compound intake ports and inverse cuneiform-shaped combustion chamber can further improve both EGR tolerance and initial combustion rate, leading to significant improvement in thermal efficiency.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2023)
Article
Energy & Fuels
Jingrui Li, Xinlei Liu, Haifeng Liu, Ying Ye, Hu Wang, Jingjin Dong, Bo Liu, Mingfa Yao
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.