Article
Environmental Sciences
D. V. Antonov, I. G. Donskoy, O. S. Gaidukova, S. Ya. Misyura, V. S. Morozov, G. S. Nyashina, P. A. Strizhak
Summary: The dissociation and combustion behavior of double gas hydrates in a tubular muffle furnace were studied to improve combustion efficiency and reduce gas emissions. The experiments and simulations showed that double gas hydrates have more stable combustion and their dissociation rate increases with temperature. The presence of heavy hydrocarbons in double gas hydrates reduces unburned CH4 emissions, but increases CO2 emissions. Furnace temperature and gas hydrate composition also impact anthropogenic gas emissions.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Chemical
Zhixia Deng, Shuanshi Fan, Yanhong Wang, Xuemei Lang, Gang Li
Summary: The addition of stainless steel fiber in the solution for gas storage in hydrates improves the heat removal issue during hydration process, enhances gas storage speed and capacity by increasing nucleation sites. Longer stainless steel fibers show higher gas storage capacity and methane uptake rate compared to shorter fibers. Stainless steel fiber combined with sodium dodecyl sulfate demonstrates excellent gas storage performance with reduced usage amount and increased volume gas storage density.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Thermodynamics
Zhixia Deng, Shuanshi Fan, Yanhong Wang, Xuemei Lang, Gang Li, Faping Liu, Mengyang Li
Summary: In this study, the promotion effects of four different morphologies and hydrophobic properties of graphite on hydrate were compared to identify a mode for promoting CO2 hydrate formation. The results showed that fluorinated graphene with superhydrophobic nanostructure had the strongest gas storage effect by promoting hydrate nucleation and sustainable growth. When combined with surfactant SDS, the system achieved the best performance with a gas storage capacity of 5.02 mmol/g H2O. This mode of enhancing mass transfer at the gas-liquid interface provided a novel way to promote hydrate-based applications and carbon sequestration technology.
Article
Engineering, Environmental
Aritra Kar, Vaibhav Bahadur
Summary: This study develops a simulation framework based on fundamental principles to analyze the heat transfer, mass transfer, and interfacial phenomena associated with gas hydrate formation. By simulating CO2 hydrate formation and validating against experimental data, several important conclusions regarding hydrate formation are drawn, such as the adverse impact of inadequate heat dissipation, the importance of small bubble size for growth rates, and the enhancement of CO2 separation efficiency by increasing reactor pressure.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Xin-Yang Zeng, Jing-Chun Feng, Wei Ke, Jiang Wang, Si Zhang, Yan Xie
Summary: The study explores the effect of hydrate inhibitors on the morphological evolution of hydrate growth, specifically focusing on the growth kinetics of methane-propane hydrate film. The results indicate that the inhibitors play a crucial role in inhibiting hydrate growth, with the hydrate film acting as a mass transfer barrier. The research also highlights the importance of environmental factors, such as subcooling and inhibitor concentration, in determining the growth rate and morphology of the hydrate film. This study provides valuable insights for effectively inhibiting hydrate growth and ensuring multiphase flow in deep sea oil & gas transportation.
Article
Green & Sustainable Science & Technology
Hongsheng Dong, Jiaqi Wang, Zhuoxue Xie, Bin Wang, Lunxiang Zhang, Quan Shi
Summary: This review discusses the potential applications of gas hydrates in energy and environmental fields, highlighting their advantages in gas storage, gas separation, wastewater treatment, and other areas. Challenges, limitations, and future directions for each application are also explored in the paper.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Energy & Fuels
K. P. Lijith, Reddi Srinivasa Rao, Devendra Narain Singh
Summary: This study investigates the synthesis of CO2 hydrates in partially saturated finesands under triaxial conditions and analyzes their elastic properties and formation and dissociation processes. The results show that the induction time for CO2 hydrate formation increases and the water-to-hydrate conversion ratio decreases with an increase in the initial water content.
Article
Thermodynamics
Mengru Tian, Yongchen Song, Jia-nan Zheng, Guangjun Gong, Mingjun Yang
Summary: This study simulated methane hydrate sediment with a temperature gradient and found that the temperature gradient affects the formation and dissociation of hydrates. The results of this study are significant for improving the efficiency of methane hydrate exploitation.
Article
Engineering, Environmental
Chanjuan Liu, Zhen Long, Yong He, Xuebing Zhou, Deqing Liang
Summary: This study investigates the growth and storage performance of CO2 hydrates under different conditions, and finds that the water film on silica gel particles is the main factor affecting gas storage efficiency. Silica gels with 30% water saturation can achieve the highest CO2 storage capacity. In addition, it is found that SDS can increase the CO2 storage volume ratio under high water saturation and reduce the volume ratio decay in repeated tests.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
S. Y. Misyura, I. G. Donskoy
Summary: Methane gas hydrate is a significant reservoir of low-carbon energy, with the potential for environmentally friendly energy production. The dissociation mechanisms of methane hydrates are still not well understood, hindering the development of related technologies. There are differences in dissociation rates between natural gas hydrate and artificial methane hydrate, and using larger sphere diameters can help reduce dissociation rates.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
D. V. Antonov, O. S. Gaidukova, V. V. Dorokhov, S. Ya. Misyura, V. S. Morozov, N. E. Shlegel, P. A. Strizhak
Summary: This paper investigates the heat and mass transfer during the ignition of single and double granulated hydrates in a combustion chamber. Experiments were conducted using a laboratory-scale oblong reactor. The ignition delay times, combustion regimes, and flame zone sizes were determined, and the joint influence of the hydrate granules on ignition behavior was analyzed. A model was developed to estimate the threshold boundary conditions for hydrate ignition in chambers of different sizes and compositions. The dissociation rates of the hydrates and the thermal conditions for consistent ignition were predicted. (c) 2023 Elsevier Ltd. All rights reserved.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Review
Energy & Fuels
Zi-Jie Ning, Hong-Feng Lu, Shao-Fei Zheng, Dong-Hui Xing, Xian Li, Lei Liu
Summary: This article provides a comprehensive review on the theoretical modeling and numerical studies conducted on the production of gas from natural gas hydrates. It summarizes the fundamental models for hydrate dissociation and various numerical works addressing the dissociation process and flow characteristics. Numerical simulations have greatly contributed to understanding the gas production mechanism and developing effective exploitation methods. The article also discusses existing challenges, alternative strategies, and future directions from a practical application perspective.
Article
Thermodynamics
Xiaoya Zang, Jing Wang, Yong He, Xuebing Zhou, Deqing Liang
Summary: In this study, TBAB hydrates were synthesized and their carbon capture capacity from a ternary gas mixture of CH4/CO2/N-2 was investigated. The addition of TBAB increased the specific surface area of the hydrate crystals and transformed the hydrate structure. These findings are important for the development of hydrate gas separation technology.
Article
Engineering, Environmental
Shengli Li, Shijing Zhang, Kai Su, Qiang Liu, Haonan Wu, Zhiyong Chang
Summary: This study investigates the formation and decomposition processes of binary and ternary gas hydrates. The results show that in the formation stage, CH4 is adsorbed in the hydrate cages constructed by C2H6 and C3H8. During the decompositions, CH4 and C2H6 molecules are preferentially released from the hydrate structures, while C3H8 molecules can stay in the hydrate phase.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Valeriy A. Vlasov
Summary: A kinetic model of gas hydrate formation from ice is presented, showing that the rate of methane hydrate formation from ice is influenced by temperature and methane pressure. It was also found that the gas hydrate formed from ice does not have a porous structure.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Energy & Fuels
Anatoliy M. Pavlenko, Karolina Sadko
Summary: This paper analyzes the methods of numerical determination of the U-value for windows, including those with passive technologies to improve thermal performance. It evaluates the accuracy of traditional approaches to calculating heat loss in window structures, highlighting the non-uniformity of heat flux density on the window surface and its impact on calculations based on stationary heat transfer conditions.
Article
Energy & Fuels
Mykola Radchenko, Andrii Radchenko, Eugeniy Trushliakov, Hanna Koshlak, Roman Radchenko
Summary: This paper explores the efficient application of speed-regulated compressors (SRCs) in both conventional air conditioning systems (ACS) and more advanced variable refrigerant flow (VRF) outdoor and indoor ACS to handle changeable heat loads. The study suggests that by covering peak loads and utilizing excess refrigeration energy at decreased actual loads, the size of the SRC can be reduced. The authors propose dividing the overall heat load range of the ACS into ranges with changeable and unchangeable loads to achieve a reduction in the changeable load range and SRC size.
Article
Energy & Fuels
Mykola Radchenko, Andrii Radchenko, Eugeniy Trushliakov, Anatoliy Pavlenko, Roman Radchenko
Summary: By determining the optimal refrigeration capacity and providing the maximum annual refrigeration energy generation, the design of air conditioning systems can be optimized to achieve maximum energy efficiency.
Article
Energy & Fuels
Serhiy Serbin, Mykola Radchenko, Anatoliy Pavlenko, Kateryna Burunsuz, Andrii Radchenko, Daifen Chen
Summary: Currently, the urgent issue of decarbonizing energy systems is being addressed. For gas turbine power systems, it is relevant to switch to pure hydrogen or hydrogen-natural gas mixtures. However, difficulties arise such as flashback zones, acoustic instability of combustion, higher wall temperatures, and increased nitrogen oxides emission. This study aims to improve efficiency by combusting pure hydrogen and natural gas-hydrogen mixtures in the gas turbine power systems. The research focuses on the premixed combustion chamber and sequential injection of ecological and energy steam in the Aquarius power plant, as well as the basic aerodynamic and energy parameters of a gas turbine combustor. The results suggest a recommended hydrogen content limit of 20% in the mixtures to avoid flashback zones, and no flashback zones occur when using pure hydrogen in the combustor of the Vodoley combined-cycle power plant.
Article
Environmental Sciences
Anatoliy Pavlenk, Hanna Koshlak, Borys Basok, Tatiana Hrabova
Summary: This article presents a methodology to assess the intensity of heat exchange processes, predicting the energy parameters of heat exchange equipment and the degree of intensification of heat transfer processes.
ROCZNIK OCHRONA SRODOWISKA
(2023)
Article
Environmental Sciences
Anatoliy Pavlenk, Hanna Koshlak, Borys Basok, Tatiana Hrabova
Summary: A steam explosion occurs when a thermolabile liquid phase contacts a hot liquid, resulting in microdispersed fragmentation of a high-boiling liquid. A mathematical model is proposed to describe the thermomechanical crushing process, considering the vapor layer formation at the interface between the two phases and the force interaction of several simultaneously boiling particles in the dispersed phase.
ROCZNIK OCHRONA SRODOWISKA
(2023)
Article
Environmental Sciences
Anatoliy Pavlenko, Hanna Koshlak, Borys Basok, Volodymyr Novikov
Summary: This article investigates the aerodynamic characteristics of a small H-Darrieus wind turbine and proposes correlations between the geometric and aerodynamic features of its blades to optimize their design. The study considers various wind speeds, aerodynamic forces, and rotational moments in order to optimize the blade profile and dimensions. The findings are valuable in designing and studying low-power wind turbines that operate with low wind speeds and variable directions.
ROCZNIK OCHRONA SRODOWISKA
(2023)
Article
Energy & Fuels
Mykola Radchenko, Zongming Yang, Anatoliy Pavlenko, Andrii Radchenko, Roman Radchenko, Hanna Koshlak, Guozhi Bao
Summary: Enhancement of gas turbine efficiency through inlet air cooling is a promising trend in thermal engineering. By utilizing waste heat recovery chillers, combustion engines can achieve better efficiency and reduce carbon emissions. Rational design of the cooling capacity is essential for successful operation.
Article
Energy & Fuels
Victoria Kornienko, Mykola Radchenko, Andrii Radchenko, Hanna Koshlak, Roman Radchenko
Summary: Cogeneration or combined heat and power (CHP) is widely used in various industries due to its effectiveness in meeting the increasing demand for electricity, steam, hot water, and its advantages over traditional systems. This study investigated the afterburning of fuel oil in the exhaust gas of diesel engines to enhance cogeneration power plant efficiency by increasing boiler steam capacity and reducing waste heat and exhaust emissions. Experimental data on low-temperature corrosion of gas boiler condensing heat exchange surfaces were used to determine the acceptable corrosion rate and lowest exhaust gas temperature for deep exhaust gas heat utilization and high efficiency of the exhaust gas boiler. The use of afterburning fuel oil and efficient exhaust gas boilers with low-temperature condensing surfaces can increase the efficiency and power of diesel engine-based CPPs by up to 5%.
Article
Thermodynamics
Nadia Buyak, Valeriy Deshko, Inna Bilous, Anatoliy Pavlenko, Anatoliy Sapunov, Dmytro Biriukov
Summary: The paper investigates the relationship between building function, orientation, thermal insulation, energy efficiency, and occupant thermal comfort. Dynamic energy state modeling was conducted on a preschool facility in Kyiv, Ukraine, considering different comfort levels in each zone and occupants' activity. The study found that increasing thermal resistance and implementing intermittent heating, ventilation, and increased thermal protection can significantly reduce energy consumption.
Editorial Material
Chemistry, Physical
Anatoliy Pavlenko
Article
Environmental Sciences
Boris Basok, Anatoliy Pavlenko, Oleksandr Nedbailo, Ihor Bozhko, Maryna Moroz
Summary: This article uses a two-dimensional numerical model to analyze the heat exchange process of a shallow horizontal soil heat exchanger and proposes rational design parameters. The results show that a spacing of 0.95 meters between the axis of adjacent pipes is optimal under the soil conditions of Kyiv.
ROCZNIK OCHRONA SRODOWISKA
(2023)
