Article
Energy & Fuels
Aneesh Vijay Kale, Anand Krishnasamy
Summary: This study aims to extend the operating load range of a diesel engine in HCCI mode by using high volatile, optimum reactivity fuel. The results show that increasing the content of diisopropyl ether in fuel blends can improve the indicated thermal efficiency, but also increase the emissions of unburned hydrocarbon and carbon monoxide.
Article
Thermodynamics
Aneesh Vijay Kale, Anand Krishnasamy
Summary: In this study, experiments were conducted on a modified diesel engine operating in port fuel injected HCCI mode with gasoline-isobutanol blends. It was found that increasing the concentration of isobutanol in the fuel blends improved the engine's load range, performance, and reduced emissions. Additionally, the addition of a cetane improver, 2-EHN, enabled stable HCCI combustion at lower engine loads.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Energy & Fuels
Chang Hee Byun, Jong Tai Lee, Oh Chae Kwon
Summary: The self-ignition and knocking characteristics of hydrogen-fueled homogeneous compression charge ignition (HCCI) engines without carbon emissions were studied experimentally. The study used a rapid compression expansion machine (RCEM) and explored various compression ratio (e) and fuel-equivalence ratio (0) conditions without preheating the intake air. The results showed that self-ignition occurred at 0 = 0.42 and e = 22.0, even though the theoretical self-ignition e was 27.5. Knocking was observed at different frequencies in the frequency domain depending on the fuel-equivalence ratio and compression ratio.
Article
Energy & Fuels
Narankhuu Jamsran, Hyunwook Park, Junsun Lee, Seungmook Oh, Changup Kim, Yonggyu Lee, Kernyong Kang
Summary: HCCI combustion with different syngas compositions was studied, showing that higher H2 content in the fuel can facilitate fast burning and good combustion stability. The NOx emissions were very low due to the ultra-lean, diluted charge used for HCCI combustion.
Review
Thermodynamics
Anand Krishnasamy, Saurabh K. Gupta, Rolf D. Reitz
Summary: Low Temperature Combustion (LTC) strategies offer potential for reducing NOx and soot emissions from diesel engines while improving thermal efficiency, but face challenges such as precise ignition timing control and unburned fuel emissions. Addressing these challenges may require modifications to engine or fuel design, and exploring alternative fuels suitable for different LTC strategies.
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2021)
Article
Chemistry, Applied
Ahmad O. Hasan, Ahmed I. Osman, Ala'a H. Al-Muhtaseb, Hani Al-Rawashdeh, Ahmad Abu-jrai, Riad Ahmad, Mohamed R. Gomaa, Tanmay J. Deka, David W. Rooney
Summary: The study found that blended methanol can reduce HC and CO emissions in tailpipe, but increase NOx emissions; smoke emissions significantly decrease as the percentage of methanol in blends increases. Pure diesel showed higher brake thermal efficiency and lower fuel consumption at all engine loads.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Energy & Fuels
Masoud Rabeti, Ali Akbar Ranjbar, Omid Jahanian, Seyed Mohammad Safieddin Ardebili, Hamit Solmaz
Summary: Homogeneous charge compression ignition (HCCI) engine shows potential as an alternative to traditional internal combustion engines due to its high thermal efficiency and low emissions. This study compared the accuracy of different heat transfer models and found that Assanis and Hohenberg models performed the best in estimating heat transfer in an HCCI engine. The engine operating parameters, such as intake pressure, equivalence ratio, and engine speed, were found to have significant impacts on heat flux.
Review
Green & Sustainable Science & Technology
Djati Wibowo Djamari, Muhammad Idris, Permana Andi Paristiawan, Muhammad Mujtaba Abbas, Olusegun David Samuel, Manzoore Elahi M. Soudagar, Safarudin Gazali Herawan, Davannendran Chandran, Abdulfatah Abdu Yusuf, Hitesh Panchal, Ibham Veza
Summary: Research and development in the internal combustion engine have been growing, and diesel engines have advantages in efficiency, power output, and reliability. Although observing diesel spray is complex due to its high-speed, high-pressure, and high-temperature conditions, some mechanisms have been explained and suggestions have been made. This paper comprehensively reviews the current status of theoretical diesel spray and modeling.
Article
Energy & Fuels
Aneesh Vijay Kale, Anand Krishnasamy
Summary: Recent research has shown that homogeneous charge compression ignition (HCCI) engines can enhance traditional compression-ignition engines. Gasoline-like fuels with higher octane number and vapor pressure are better suited for port fuel-injected HCCI engines. By adding ignition promoters, intake charge preheating or turbocharging requirements can be eliminated, and cyclic variations in combustion can be reduced. Suitable diluents can prevent knocking and enable higher load extension. This study investigated various ignition promoters and diluents to achieve constant combustion phasing in gasoline-fueled HCCI combustion.
Article
Thermodynamics
G. D. Telli, G. Y. Zulian, T. D. M. Lanzanova, M. E. S. Martins, L. A. O. Rocha
Summary: Homogeneous charge compression ignition (HCCI), also known as Controlled Auto-Ignition (CAI), enables combustion with high fuel conversion efficiency and low NOX emissions. Water injection was used for combustion phasing control and load expansion in an ethanol HCCI engine, achieving significant improvements in maximum operational load and combustion efficiency.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Akhilendra Pratap Singh, Vikram Kumar, Avinash Kumar Agarwal
Summary: Stricter emission norms, scarce availability of conventional fuel resources, and moderate engine efficiency are major concerns for both spark ignition (SI) and compression ignition (CI) engines. The use of advanced low-temperature combustion technologies, particularly reactivity-controlled compression ignition (RCCI) mode combustion, can address these issues effectively. RCCI mode combustion offers lower exhaust emissions and higher brake thermal efficiency compared to CI mode combustion, making it a promising solution for improved engine performance and reduced emissions.
Article
Thermodynamics
Jisoo Shin, Sungwook Park
Summary: Due to environmental regulations, the use of ammonia as a carbon-free fuel for internal combustion engines is gaining attention. This study investigated the combustion characteristics of an ammonia-diesel dual-fuel engine through numerical simulation. The results showed that advanced injection timing and high ammonia energy fraction can significantly improve efficiency and reduce greenhouse gas emissions.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Energy & Fuels
Sebastian H. Quintana, Andres D. Morales Rojas, Ivan D. Bedoya
Summary: This research explores the use of biogas-fueled HCCI engines for power generation at high altitudes in Colombia. Experimental and numerical results show that the addition of ozone can lower the intake temperature requirements and improve engine performance. The findings are important for the design and implementation of microgeneration systems in developing countries with challenging HCCI combustion conditions.
Article
Energy & Fuels
Narankhuu Jamsran, Hyunwook Park, Junsun Lee, Seungmook Oh, Changup Kim, Yonggyu Lee, Kernyong Kang
Summary: This study experimentally investigated the effects of various syngas compositions on combustion and emissions of a homogeneous charge compression ignition (HCCI) engine. The results showed that a syngas composition with high H2 content and low CO content was favorable for improving thermal efficiency and load extension of the engine.
Article
Energy & Fuels
Tareq Mihyar, Emre Sen, H. Serhad Soyhan
Summary: With the global concerns about fuel economy and consumption, engine developers are striving to reduce fuel consumption, but only a few new engine technologies have been introduced due to complexity and development challenges. However, the market demands more efficient engines, which has led to a focus on new mechanisms. This study evaluates the implementation of the JAZARI mechanism in a theoretical 4-cylinder Compression Ignition diesel engine and compares the performance with a calibrated conventional mechanism engine. The results show improved thermal efficiency and torque with the JAZARI mechanism, indicating its advantage in boosting engine performance with less risk on the engine internals.
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.