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Showing records 76 to 100 of 36338. [First] Page: 1 2 3 4 5 6 7 8 Last
Three-Dimensional Printing of Synthetic Core Plugs as an Alternative to Natural Core Plugs: Experimental and Numerical Study
Juan Antonio Cruz-Maya, José Luis Mendoza-de la Cruz, Luis Carlos Martínez-Mendoza, Florencio Sánchez-Silva, José Alfredo Rosas-Flores, Janet Jan-Roblero
November 30, 2023 (v1)
Subject: Other
Keywords: core flooding test, digital rock physics, three-dimensional (3D) additive manufacturing
This paper proposes three-dimensional (3D) additive fabrication of synthetic core plugs for core flooding experiments from spheres and grains of Berea Sandstone using a digital particle packing approach. Samples were generated by systematically combining the main textural parameters of the rock reservoir to design synthetic core plugs Numerical flow simulation was per-formed using the lattice Boltzmann method (LBM) to verify the flow distribution and permeability for comparison with the experimentally measured permeability and to that obtained from correlations in the literature. The digital porosity of the sample was compared to the porosity measured using an HEP-P helium porosimeter. The numerical and experimental results for permeability and porosity differed by a maximum of 18%.
Innovative Method for Determining Young’s Modulus of Elasticity in Products with Irregular Shapes: Application on Peanuts
Joelle Nader, Jean Claude Assaf, Espérance Debs, Nicolas Louka
November 30, 2023 (v1)
Keywords: Hooke’s theory, peanuts, response surface methodology, stress-strain, Young’s modulus of elasticity
Accurate determination of Young’s modulus of elasticity in irregularly shaped products is quite challenging. This study introduces a novel method that can measure the elasticity in non-uniform products, such as peanuts. Variations of the contact surface between the peanut and a crosshead were precisely calculated using this technique based on kernels blueprints remaining on graph paper after compression. The elastic modulus was assessed by stress-strain tests using Hooke’s theory. The significance of the effects of water content and loading rate on the elastic modulus of peanuts was studied using the Response Surface Methodology (RSM). Results showed that the elasticity was mostly influenced by the kernel’s water content. It decreased from 3.75 to 0.10 MPa when the initial water content increased from 7 to 18% (dry basis). Water content had a significant effect on Young’s modulus (p < 0.05) at 95% confidence level with a correlation coefficient (R2) of 95.52%. Conversely, the effect... [more]
The Law of Gas−Liquid Shear Mixing under the Synergistic Effect of Jet Stirring
Wei Zhou, Hui Wang, Lingling Wang, Liang Li, Chuanchuan Cai, Jinbo Zhu
November 30, 2023 (v1)
Subject: Materials
Keywords: interaction impact, multiphase mixing, synergy
At present, there is a common problem that the mixing mode is single and it is difficult to overcome the inherent bottleneck of multiphase mixing. A mixing device combining the advantages of jet entrainment and mixing dispersion was designed and built. In an effort to determine the mixing degree of two phases, the mixing coefficient of gas−liquid charging was measured using the cylinder method with the optimal working parameters. To explore the optimization of the mixing conditions and control mechanism of multiphase materials, the law of gas−liquid shear mixing in the process of multi-force field synergistic change was revealed. Based on the testing of the gas injection capacity under different working conditions and the calculation of the gas−liquid two-phase mixing coefficient, it was concluded that the flow rate was the direct key factor affecting the gas injection capacity. The working speed also had a certain impact on the gas injection capacity. When working at a high speed and... [more]
Molecular Insight into the Occurrence Characteristics of Deep Oil with Associated Gas Methane and the Displacement Resistance in Water Flooding in Nano-Pore Throat
Lixia Zhou, Weiming Wang, Youguo Yan, Chengen Zhao, Jiahao Zhong, Yuqi Liu
November 30, 2023 (v1)
Keywords: molecular dynamic simulation, oil with associated gas, the occurrence characteristics, water displacement oil and gas process
In deep oil reservoirs, the existence of associated gas generally has a crucial impact on crude oil properties and flow performance. In this work, adopting molecular dynamic simulation, we studied the occurrence characteristics of oil with associate gas methane (the molar ratio of methane to oil rm/o were 1/4, 2/3, 3/2, and 4/1) in nano-pore throat and the displacement behavior of oil and methane in the water flooding process. Simulation results indicated: (1) an increasing replacement of the adsorption-status oil by methane as the methane content increased; (2) the oil and methane displacement efficiency was enhanced as the methane content increased in the water displacement oil and gas process; (3) the threshold displacement pressure gradually decreases as the methane content increases. The microscopic characteristics of the occurrence features and displacement performance of crude oil with associated methane in nano-pore throat were discussed in detail, and the underlying mechanism... [more]
Effect of LiCl Electrolyte Concentration on Energy Storage of Supercapacitor with Multilayered Ti3C2Tx MXene Electrodes Synthesized by Hydrothermal Etching
Alexey Tsyganov, Alexander Shindrov, Maria Vikulova, Denis Zheleznov, Alexander Gorokhovsky, Nikolay Gorshkov
November 30, 2023 (v1)
Keywords: capacity, Energy Storage, hydrothermal etching, molten salt, MXene, supercapacitor
The development of new electrode materials for electrochemical systems for various purposes is a significant and in-demand task of scientific research. Layered transition metal carbides and nitrides, known as MXenes, show great potential for use as electrodes in electrochemical energy storage devices operating in aqueous electrolytes. In this work, a multilayer Ti3C2Tx MXene was obtained from a Ti3AlC2 precursor and studied as the electrode material of a symmetrical supercapacitor with an aqueous LiCl electrolyte. The formation of the MXene structure was confirmed by the data from X-ray phase analysis and scanning electron microscopy. The X-ray diffraction pattern showed the disappearance of the main reflections related to the Ti3AlC2 phase and the shift of the reflection peak (002) from 9.4° to 6.7°, which indicated successful etching of the Al layers from the Ti3AlC2 precursor. At electrolyte concentrations of 1, 5, 10, and 20 M, the supercapacitors demonstrated high specific capacit... [more]
The Displacement Behaviors of Different Pore-Scales during CO2 Flooding and Huff-n-Puff Processes in Tight Oil Reservoirs Using Nuclear Magnetic Resonance (NMR)
Mingyang Yang, Shijun Huang, Kuiqian Ma, Fenglan Zhao, Haoyue Sun, Xinyang Chen
November 30, 2023 (v1)
Keywords: Carbon Dioxide, EOR, NMR, pore-scales, tight oil reservoir
Injecting CO2 into tight oil reservoirs is a potential approach for enhanced oil recovery (EOR) and CO2 sequestration. However, the effects of different pore-scales on EOR are poorly understood, and this has a significant impact on recovery. In this paper, a pore size correction model based on X-ray computerized tomography (CT) and nuclear magnetic resonance (NMR) was developed in order to establish the relationship between the pore radius and the transverse relaxation time. Different pore-scales are divided according to the cumulative distribution characteristics of the transverse relaxation time (T2). CO2 flooding and huff-n-puff experiments were conducted to investigate the dynamic displacement behaviors in different pore-scales. The results indicate that there are three pore-scales: micropores (T2 < 0.3 ms), intermediate pores (0.3 ms < T2 < 100 ms), and macropores (100 ms < T2). However, there are also pseudo-sweep pores (PPs), equilibrium pores (EPs), and sweep pores... [more]
Multi-Objective Optimization of a Novel Ribbed Honeycomb Heat Sink for an Electro-Hydrostatic Actuator
Yanpeng Li, Huijun Han, Mingzhong Li, Jinhu Zhang, Youwang Xing, Sheng Lei, Xiang Yu
November 30, 2023 (v1)
Subject: Optimization
Keywords: electro-hydrostatic actuator, heat sink, multi-objective particle swarm optimization
The electro-hydrostatic actuator (EHA) is a new type of power-by-wire (PBW) actuation system, which is utilized to realize a more electric aircraft. However, EHA suffers from serious thermal problems, due to its high integration and high power density. Therefore, a reasonable heat dissipation structure is an essential method for solving this problem. In this paper, a novel ribbed honeycomb heat sink (RHCS) developed by combining a ribbed heat sink (RHS) with a honeycomb heat sink (HCS) is proposed. Moreover, the optimization of heat sink parameters was achieved by using a multi-objective particle swarm optimization algorithm (MOPSO). Initially, the thermal resistance and mass models of the HCS were constructed, based on which the optimal structural parameters of the honeycomb cell were obtained. In addition, the thermal resistance model of RHCS was constructed using the response surface method, and parameters such as rib spacing, height and width were obtained based on MOPSO. Finally,... [more]
Energy Variation Features during the Isothermal Adsorption of Coal under High-Temperature and High-Pressure Conditions
Tongling Jing, Chuanqi Tao, Yanbin Wang, Huan Miao, Mingyu Xi, Xingchen Zhao, Haiyang Fu
November 30, 2023 (v1)
Keywords: high-temperature and high-pressure, isothermal adsorption, methane adsorption, surface free energy
This paper aims to describe methane adsorption in coal under the conditions of high temperature and high pressure, as well as quantitatively decipher the change rule of energy in the isothermal adsorption process. The isothermal adsorption test was carried out with four groups of middle-rank coals from the Linxing area with different degrees of metamorphism. The impacts of the degree of deterioration of coal, temperature, and pressure on adsorption were analyzed with regard to the adsorption amount, adsorption potential, and adsorption space. Additionally, the energy change during the adsorption of methane by the coal was considered. The results show that the coal adsorption capacity hinges on the degree of deterioration of the coal, as well as the pressure and temperature. Additionally, the impact of temperature upon coal methane adsorption under depth conditions is highlighted. Like the adsorption space, the adsorption potential is an important parameter used to quantitatively charac... [more]
High-Temperature and Pressure Downhole Safety Valve Performance Envelope Curve Study
Guohai Yuan, Yonghong Wang, Yexin Fang, Rutao Ma, Kun Ning, Yang Tang
November 30, 2023 (v1)
Subject: Materials
Keywords: critical load, downhole safety valve, envelope curve, high-temperature and pressure, mechanical properties
The introduction of downhole safety valve performance envelope curves can effectively prevent the failure of the downhole safety valves during field operations. The method of drawing the performance envelope curve of high-temperature and pressure downhole safety value was proposed based on the mechanical properties of the downhole safety valve. The numerical simulation method was used for the mechanical performance of the downhole safety valve, and the stress change law of the overall structure of the downhole safety valve under the ultimate load was obtained. The ultimate bearing state and the failure threshold stress value of the key components of the downhole safety valve were further determined. The performance envelope curve of the downhole safety valve was finally completed. The results of the study show that the downhole safety value envelope curve can be obtained by studying the mechanical properties of the downhole safety valve, and each section of the envelope curve correspon... [more]
Numerical Prediction of Erosion of Francis Turbine in Sediment-Laden Flow under Different Heads
Jinliang Wang, Xijie Song, Hu Wang, Ran Tao, Zhengwei Wang
November 30, 2023 (v1)
Keywords: different heads, Francis turbine, guide vane opening, sediment erosion, sediment-laden flow
Hydropower stations are an important source of clean energy, usually operating in sandy water flow, and the turbine wheels may suffer severe wear and tear. In addition, during the operation of the unit, it is necessary to operate at different water heads according to the actual situation, which will result in varying degrees of wear and tear. In this paper, the Lagrange method is used to study the wear characteristics of a Francis turbine under different water heads. The research object is the water turbine in Wanjiazhai Hydropower Station. Research has shown that wear on the walls of the turbine volute, guide vanes, and runner is inevitable, and the clearance walls are also vulnerable to wear. The difference in the water head mainly affects the movement trajectory and impact speed of particles. The higher the water head, the more severe the wear on the wall surface of the flow passage components. Both the crown and lower ring of the runner are worn. The impact of particles causes wear... [more]
Economic Dispatch of AC/DC Power System Considering Thermal Dynamics
Xiping Ma, Chen Liang, Xiaoyang Dong, Yaxin Li
November 30, 2023 (v1)
Keywords: AC/DC power system, district heating system, economic dispatch, partial differential equation, Renewable and Sustainable Energy
Advance in renewable penetration has promoted the interaction between the AC and DC power system and multi-energy sources. However, the disparate nature of different energy utilization technologies presents strong challenges for the economic dispatch of such a complex system. This paper proposes a comprehensive characterization of the AC/DC power system considering multi-energy and renewable integration. Detailed models are elaborated for the AC/DC power grid, the district heating system (DHS), coupling units, and renewables to describe their inner interactions accurately. On this basis, an economic dispatch method is developed to minimize the operation cost and renewable’s abandonment. Simulations indicate that the interaction between the AC/DC power systems and multi-energy sources can enhance voltage levels and improve operational economy.
Thermo-Mechanical Numerical Analysis of Stress and Damage Distribution within the Surrounding Rock of Underground Coal Gasification Panels
Pengfei Wang, Jingen Deng, Wei Liu, Qiangzhong Xiao, Qian Lv, Yan Zhang, Youlin Hou
November 30, 2023 (v1)
Keywords: damage distribution, failure mechanisms, rock properties, temperature dependency, thermo-mechanical behavior, underground coal gasification
Underground coal gasification (UCG) is a promising technology for extracting synthesis gas from coal seams through in situ gasification. This study aims to investigate the thermo-mechanical behavior and integrity of the surrounding rock in the gasification vicinity to facilitate safe and efficient UCG operations. Rock property testing experiments are conducted under varying temperature conditions, revealing significant temperature dependencies for the thermal and mechanical parameters. A thermo-mechanical coupling model is developed to analyze the stress and damage distribution near the gasification chamber. The influence of the temperature dependency of stress states and failure risks during the gasification process is evaluated. In addition, the effects of panel orientation, chamber width, maintaining duration, operating temperature and operating pressure on the failure behavior of the gasification surrounding rocks are illustrated through parametric analysis. The findings have pract... [more]
Explainable Machine Learning-Based Method for Fracturing Prediction of Horizontal Shale Oil Wells
Xinju Liu, Tianyang Zhang, Huanying Yang, Shihao Qian, Zhenzhen Dong, Weirong Li, Lu Zou, Zhaoxia Liu, Zhengbo Wang, Tao Zhang, Keze Lin
November 30, 2023 (v1)
Keywords: explainable algorithm, hydraulic fracturing horizontal wells, machine learning productivity prediction model, PSO-GBDT, shale oil
Hydraulic fracturing is a crucial method in shale oil development, and predicting production after hydraulic fracturing is one of the challenges in shale oil development. Conventional methods for predicting production include analytical methods and numerical simulation methods, but these methods involve many parameters, have high uncertainty, and are time-consuming and costly. With the development of shale oil development, there are more and more sample data on the geological parameters, engineering parameters, and development parameters of shale oil hydraulic fracturing, making it possible to use machine learning methods to predict production after hydraulic fracturing. This article first analyzes the impact of different parameters on initial production and recoverable reserves based on field data from Chang-7 shale oil in the Ordos Basin of China. Then, using the Particle Swarm Optimization (PSO) algorithm and the Gradient Boosting Decision Tree (GBDT) algorithm, machine learning mod... [more]
Gangue Source Reduction Technology and Process Optimization Based on Underground Coal Gangue Photoelectric Separation
Wei Zhou, Wanghao Xia, Liangliang Liu, Liansheng Li, Qiuyu Zeng, Shujie Wang, Jinbo Zhu
November 30, 2023 (v1)
Subject: Optimization
Keywords: coal gangue photoelectric sorting, gangue source reduction, jet separation, process layout, underground gangue discharge
The precise identification of damp, sticky coal gangue; efficient jet nozzle separation; and process layout in a narrow, restricted space are essential technologies for gangue source reduction based on underground gangue photoelectric separation, which is critical for the long-term growth of coal mines. In this paper, the X-ray absorption fine structure (XAFS) method was used to identify the X-ray absorption law of different atoms in coal-based minerals and explore the differences in the microscopic crystal properties of coal gangue; the numerical simulation calculation of four commonly used nozzles—namely, flat, convergent, flat−convergent, and streamline—was carried out using Fluent software for coal gangue jet separation to optimize the nozzle morphology and parameters. The technical characteristics of the underground layout of the photoelectric separation system for coal gangue were expounded, and the technological layout of the separation system was explored. The results showed th... [more]
Extended Runge-Kutta Scheme and Neural Network Approach for SEIR Epidemic Model with Convex Incidence Rate
Ahmed A. Al Ghafli, Yasir Nawaz, Hassan J. Al Salman, Muavia Mansoor
November 30, 2023 (v1)
Keywords: consistency, neural network, SEIR model, stability, two-stage scheme
For solving first-order linear and nonlinear differential equations, a new two-stage implicit−explicit approach is given. The scheme’s first stage, or predictor stage, is implicit, while the scheme’s second stage is explicit. The first stage of the proposed scheme is an extended form of the existing Runge−Kutta scheme. The scheme’s stability and consistency are also offered. In two phases, the technique achieves third-order accuracy. The method is applied to the SEIR epidemic model with a convex incidence rate. The local stability is also examined. The technique is evaluated compared to existing Euler and nonstandard finite difference methods. In terms of accuracy, the produced plots show that the suggested scheme outperforms the existing Euler and nonstandard finite difference methods. Furthermore, a neural network technique is being considered to map the relationship between time and the amount of susceptible, exposed, and infected people.
Controlling the Physical Properties of Fe3O4-Immobilized Palladium Complexes towards Reusable Catalysts in the Methoxycarbonylation of 1-Hexene
Saphan O. Akiri, Markus Schmitz, Stephen O. Ojwach
November 30, 2023 (v1)
Subject: Materials
Keywords: immobilization, magnetic nanoparticles, methoxycarbonylation, palladium(II), recycling
This paper describes the use of immobilized palladium catalysts on Fe3O4 magnetic nanoparticles (MNPs) to afford magnetically separable catalysts in the methoxycarbonylation of 1-hexene. Immobilization of homogeneous complex [Pd(L1)Cl2] (Pd1), where L1 = N,N′E,N,N′E)-N,N′-(3-(3-(triethoxysilyl)propyl)pentane-2,4-diylidene)dianiline, on Fe3O4 MNPs at 100 °C and Pd loading of 10% (based on wt% of Pd1) afforded the corresponding complex [Pd1@Fe3O4] (Pd2) in good yields. The use of calcination temperatures of 150 °C and 200 °C produced compounds Pd3 and Pd4, respectively, while Pd metal loadings (based on wt% of Pd1) of 5% and 15% provided complexes Pd5 and Pd6, respectively. The immobilized compounds were analyzed using FT-IR spectroscopy, SEM-EDX, TEM, ICP-OES, and PXRD techniques. The surface areas and porosity of the materials were determined using nitrogen physisorption measurements and confirmed the formation of mesoporous materials, while SQUID measurements established Ms values in... [more]
CsPbBr3 Films Grown by Pulsed Laser Deposition: Impact of Oxygen on Morphological Evolution and Properties
Marcella Marra, Chiara Provenzano, Maura Cesaria, Rosella Cataldo, Anna Grazia Monteduro, Anna Paola Caricato
November 30, 2023 (v1)
Subject: Materials
Keywords: bromine vacancies, CsPbBr3 halide perovskite, oxygen incorporation during growth, PLD technique
Among all the inorganic perovskites, cesium lead bromide (CsPbBr3) has gained significant interest due to its stability and remarkable optoelectronic/photoluminescence properties. Because of the influence of deposition techniques, the experimental conditions that play a key role in each need to be addressed. In this context, we present CsPbBr3 films grown by pulsed laser deposition (PLD) and discuss the impact of oxygen stemming from their growth under a reduced vacuum, i.e., as the background atmosphere, rather than from post-growth exposure. In detail, stoichiometric mechano-chemically synthesized targets were prepared for deposition by nanosecond-PLD (λ = 248 nm, τ = 20 ns, room temperature, fluence of 1 J/cm2) to produce slightly Br-deficient CsPbBr3 films under different background pressure conditions (P0 = 10−4, 10−2 Pa). The characterization results suggest that the presence of oxygen during the deposition of CsPbBr3 can advantageously passivate bromide-vacancy states in all the... [more]
A Comparative Study on the Bioavailability and Soil-to-Plant Transfer Factors of Potentially Toxic Element Contamination in Agricultural Soils and Their Impacts: A Case Study of Dense Farmland in the Western Region of Saudi Arabia
Basma G. Alhogbi, Shroog A. Al-Ansari, Mohammed S. El-Shahawi
November 30, 2023 (v1)
Keywords: agricultural soil, edible vegetables, pollution assessment, soil-to-plant transfer factors, toxic elements
Soil and aquatic pollution by heavy metal (Pb, Cr, Cu, Fe, Zn, and Ni) ions has become one of the prime problems worldwide. Thus, the purpose of the current study is to conduct hydrogeological research and quantify the main trace metals in the edible vegetables, soil, irrigation water, pesticides, and fertilizers in the farmland near Jeddah city, Saudi Arabia. Samples of soil, water, and plants such as coriander (Coriandrum sativum), dill (Anethum graveolens), parsley (Petroselinum crispum), and arugula (Eruca sativa) were collected, acid-digested, and analyzed using an inductively coupled plasma−optical emission spectrometer (ICP−OES). The levels of the elements in soil were determined in the order of Fe > Zn > Cu > Cr > Ni > Pb, whereas the sequence in plants was Fe > Cr > Zn > Pb> Ni > Cu, and in water, the order was Pb > Fe > Cu > Zn> Ni = Cr. In soil, the levels of Fe, Cr, and Pb were higher than the recommended values set by the World Health Organization (WHO) and the Food Admini... [more]
Experimental Study and Mathematical Modeling under Various Hot-Air Drying Conditions of Thin Layer Olive Pomaces
Chafaa Nsibi, Marzouk Lajili
November 30, 2023 (v1)
Keywords: convective drying, effective diffusion coefficient, kinetics, Modelling, olive pomace
The present work studies the convective drying of a granular porous medium in a bed of olive pomace. The experimental tests were conducted in a closed convection drying loop of hot air. The experimental tests measured the mass loss over time. Tests were carried out for five temperature values: 60 ± 0.1 °C, 70 ± 0.1 °C, 80 ± 0.1 °C, 90 ± 0.1 °C and 100 ± 0.1 °C, respectively. Moreover, three values of velocities of the drying air, 1 ± 0.01 ms−1, 1.5 ± 0.01 ms−1 and 2 ± 0.01 ms−1, were considered. The effects of initial humidity, bed thickness and pomace composition on the drying process were studied. The results show that the moisture content decreases when the temperature and the velocity of the drying air increase. In addition, the composition of olive pomace (pulp, pits and raw pomace) significantly affects the drying time. A characteristic drying curve and its equation were determined. Seven thin layer drying models were tested, and the Midilli et al.’s model produced the best agree... [more]
Integration of a Chemical Heat pump with a Post- combustion Carbon Capture Sorption Unit
Rajalakshmi Krishnadoss
December 1, 2023 (v2)
Keywords: Chemical heat pump
This is a aspen plus simulation of isopropanol based chemical heat pump. Here the products (mixture of isopropanol, acetone and hydrogen) from endothermic reactor/reboiler gets separated in the distillation column. The top distillate namely acetone and hydrogen go to the exothermic reactor where as the bottom product which is majorly isopropanol goes back to the endothermic reactor. The configuration 1 involves an exothermic reactor, a distillation column, and an endothermic reactor. The configuration 2 involves the reboiler acting as an endothermic reactor. In this case there is no separate endothermic reactor.
Exploring the Feasibility of Carbon Capture Onboard Ships
Sadi Tavakoli, Gunnar Malm Gamlem, Donghoi Kim, Simon Roussanaly, Rahul Anantharaman, Kevin Kusup Yum, Anders Valland
November 6, 2023 (v1)
Subject: Environment
Keywords: amine, Carbon Capture, Carbon Dioxide, IMO, Maritime
International shipping is crucial for global freight transport, but is mainly based on fossil fuels, leading to significant greenhouse gas (GHG) emissions. Global GHG emissions must peak by 2025 and drop by at least 43% by 2030 to limit global warming within 1.5◦C. This calls for urgent action in all sectors as well as shipping. Scaling up alternative fuels may take too long, considering technical modifications onboard the vessels, as well as fuel production and infrastructure for distribution. Many alternative fuels are also inherently dependent on access to clean electricity, which is already in a shortage. Carbon capture from ships is another route to emission reduction that can be implemented faster and without increasing the demand for renewable electricity.
Tankers, dry bulk carriers, and container vessels contribute a majority of global shipping emissions and are therefore prime candidates for carbon capture and storage. Solvent-based post-combustion capture is mature and suita... [more]
Optimal capacity design of amine-based onboard CO2 capture systems considering flexible ship operations
Juyoung Oh, Donghoi Kim, Simon Roussanaly, Rahul Anantharaman, youngsub Lim
October 18, 2023 (v1)
Keywords: MEA-based CO2 capture process, Off-design performance, Onboard carbon capture, Ship engine load profile, Techno-economic assessment
The International Maritime Organization has adopted a strategy aiming for net-zero greenhouse gas emissions from international shipping, prompting various mitigation technologies to comply with this strengthened strategy. Carbon capture technologies are increasingly being considered to satisfy the IMO strategy. In particular, amine-based carbon capture technologies, which are emerging as the most mature option, have been proposed for onboard application. However, the conventional design approach for onboard carbon capture systems, which assumes a fixed high engine load (75–100%), does not reflect flexible ship operation in a low engine load range, consequently leading to oversizing and unnecessary capital investment.
This study designs five MEA-based onboard carbon capture systems with different capacities (sizes) based on the exhaust gas conditions. The study investigates the off-design performance over the entire engine load range while maintaining the capacity of the capture syste... [more]
What is the potential of bioCCS to deliver negative emissions in Norway? From biomass mapping to a window of negative emissions potential
Nikalet Everson, Michael Becidan, Simon Roussanaly, Rahul Anantharaman, Petronelle Holt, Roger Khalil
October 3, 2023 (v1)
Subject: Biosystems
Keywords: BioCCS, Bioenergy, Mapping, Negative emission, Norway
Negative emissions have been highlighted as a key component of achieving the net-zero ambition. However, ground-up approaches are necessary to better understand the realistic potential of negative emissions technologies at the national or continental level. Such an approach was applied in the present study to bioenergy with carbon capture and storage in Norway, starting from mapping and quantification of biomass until the derivation of a window of negative emission potential.
The results indicate that bioenergy with carbon capture and storage could enable between 1 and 13 MtCO2/y of negative emissions, with a more probable range between 2 and 8 MtCO2/y at least in the coming decades. These values are drastically higher than the potential identified in previous studies thus highlighting the importance of bottom-up approaches, like the one adopted here, to better estimate the potential negative emissions from bioenergy with carbon capture and storage.
In terms of biomass, the strongest... [more]
Thermo-Mechanical Behavior of Green Sandwich Structures for Building and Construction Applications
Forhad Hossain, Md Arifuzzaman, Md Shariful Islam, Md Mainul Islam
September 21, 2023 (v1)
Subject: Materials
Keywords: flexural properties, green sandwich structure, perlite composite-filled paper honeycomb sandwich, thermal conductivity, thermal insulation board
In this work, three different types of sandwich structures were manufactured, each using a Formica sheet (a paper-based sheet) as the skin and perlite/sodium silicate foam as the core, with or without a paper honeycomb. The sandwich structures were fabricated by attaching the Formica sheets on both sides of a paper honeycomb core panel, a perlite/sodium silicate foam core panel, and a perlite/sodium silicate foam-filled honeycomb core panel. The flexural characteristics were studied by a three-point bending test and the thermal conductivity was measured using Lee’s thermal conductivity apparatus. The results demonstrated a significant improvement in flexural properties, including core shear stress, facing stress, bending stress, and energy absorption, when incorporating the paper honeycomb reinforcement. The thermal conductivity and flexural properties of the paper honeycomb reinforced and unreinforced perlite/sodium silicate foam-based sandwich panels were found to be very compatible... [more]
Changing Law of Permeability of Coal Reservoirs under Variable Pressure Conditions and Its Influence on Extraction Efficiency of Coalbed Methane
Jianbao Liu, Zhimin Song, Chengtao Yang, Bing Li, Jiangang Ren, Shengjie Chen
September 21, 2023 (v1)
Subject: Environment
Keywords: bedding direction, extraction efficiency, gas pressure, metamorphic degree, permeability, true triaxial seepage experiment
Coal permeability data are critical in the prevention and control of coal and gas outbursts in mines and are an important reservoir parameter for the development of coalbed methane. The mechanism by which permeability is affected by gas pressure is complex. We used a self-developed true triaxial seepage experimental device that collects lignite and anthracite coal samples, sets fixed axial pressure and confining pressure, and changes gas pressure by changing the orientation of the coal seam to study the influence of the gas pressure on the permeability of the coal seam under the conditions of different coal types and different bedding orientations. Coal permeability decreased rapidly and then decreased slowly and tended to be stable with the increase in gas pressure. This conformed to the power exponential fitting relationship, and the fitting degree reached more than 99%. The comparison of the two anthracite coal samples showed that the sample’s permeability with a bedding plane verti... [more]
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