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Adjustable tongue vane for improving the energy performance of a submersible single-channel pump for wastewater treatment

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Heliyon 2025年第1期11卷 e41511页

作者： Nguyen, Duc-Anh Wu, Kexin Li, Xiaojun Kim, Gyeong Sung Kim, Jin-Hyuk Convergence Manufacturing System Engineering (Green Process and Energy System Engineering) University of Science & Technology Daejeon 34113 South Korea Carbon Neutral Technology R&D Department Korea Institute of Industrial Technology Cheonan 31056 South Korea National-Provincial Joint Engineering Laboratory for Fluid Transmission System Technology Zhejiang Sci-Tech University Hangzhou 310018 China Department of Physics and Engineering California State University Bakersfield Bakersfield 93311 CA United States

Single-channel pump is a type of centrifugal pump that is frequently utilized for wastewater treatment around the world, but they often operate at low flow rates with low efficiency and loud noise because the wastewater contains many impurities. In this study, an adjustable tongue vane was developed that controls the internal flow direction in the volute to increase the energy performance of a single-channel pump. Numerical simulations were conducted by using Reynolds-averaged Navier-Stokes equations and shear stress transport turbulence model to evaluate the energy loss inside the volute. In the experiment, the single-channel pump demonstrated stable operation in the waste environment. In the numerical simulation, the −10° model increased the efficiency and total head by 1.007 % and 1.242 %, respectively compared to the reference model at the best efficiency point. At low flow rates, however, the −20° model increased the efficiency and total head by up to 25.126 % and 5.604 %, respectively, while decreasing the power consumption by up to 15.533 % compared to the reference model. This improvement is attributed to the adjustable tongue vane suppressing separation flow, which reduces hydraulic losses and energy dissipation. The proposed tongue vane can be used to improve the energy performance of not only single-channel pumps but also other centrifugal turbomachinery. © 2025 The Authors

关键词： Energy performance Entropy generation Single-channel pump Tongue vane

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Catalytic Hairpin Assembly Assisted Target-Dependent Dnazyme Nanosystem Coupled with Agpt@Thi for the Detection of Lead Ion

SSRN

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SSRN 2022年

作者： Sun, Xiaoyan Dong, Shilong Zhao, Wenying Institute of Process System Engineering Qingdao University of Science & Technology Qingdao266042 China College of Chemistry and Chemical Engineering Qilu Normal University Jinan250200 China

An ultrasensitive electrochemical biosensor for detection of lead ions (Pb2+) is proposed based on catalytic hairpin assembly and target-induced DNAzyme signal amplification strategy. PEI-rGO combined with Au@Ag NSs are used as electrode substrate modification materials, which not only increase the specific surface area but also exhibit stronger conductivity than pure PEI-rGO or Au@Ag NSs. Hairpin HP1 is immobilized on the surface of modified electrode by Au-S. Then TD can induce the opening of the HP1 hairpin, thus exposing the binding sequence to hybridize with HP2 and catalyzing the opening and binding of the hairpin HP2. When Pb2+ is present, it can catalyze DNAzyme (Pb2+-HP2) to specifically cut the substrate chain HP1, and only a partial sequence of HP1 remains on the surface of the electrode. Finally, the signal probe (AgPt@Thi-CP) can be hybridized with the part of the HP1 sequence after being cut to generate a significant electrical signal. Pb2+ concentration measured by prepared electrochemical biosensor has a good linear relationship in the range of 0.05 pM - 5 nM, and the detection limit is 0.028 pM. This method can be used for the trace detection of Pb2+ in tap water samples, and will provide a platform in environmental monitoring. © 2022, The Authors. All rights reserved.

关键词： Chemical detection

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ReaxFF molecular dynamic simulation of primary and secondary reactions involving in sub-bituminous coal pyrolysis for tar production

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Carbon Resources Conversion 2021年第1期4卷 230-238页

作者： Yanan Qian Jin-Hui Zhan Wei Xu Zhennan Han Xiaoxing Liu Guangwen Xu State Key Laboratory of Safety and Control for Chemicals SINOPEC Research Institute of Safety Engineering Co.Ltd.Qingdao 266071China State Key Laboratory of Multiphase Complex System Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Key Laboratory on Resources Chemicals and Materials of Ministry of Education of China Shenyang University of Chemical TechnologyShenyang 110142China

ReaxFF molecular dynamic simulation combined with experimental verification was performed to understand the overall reaction mechanism,especially the primary and secondary reactions involving in tar formation of sub-bituminous coal *** relationship at atomic level is clarified between bond breakage of functional groups and products generation,revealing that the amount and order in forming each product are subject to the number of corresponding functional groups and their bond energies *** primary breakage of-C-O-and-C-C-bridge-bonds present in initial coal macromolecular generates molecular of heavy tar,whereas heavy tar can be converted into light tar through cracking side chain of aromatic rings and cyclic hydrocarbons at increased pyrolysis *** very high temperatures the cracking of short-chain hydrocarbons and residual atoms connecting to aromatic rings further occurs to generate light tar and *** remaining aromatic-ring fragments of heavy tar are likely cross-linked to form ***,the simultaneous evolution tendency of tar yield and tar quality under different pyrolysis temperatures and heating rates is obtained at molecular *** obtaining high yield and quality of tar,appropriately high temperature as well as suitable heating rate are needed to compromise the high yield of primary tar and high quality of secondarily upgraded products.

关键词： ReaxFF MD simulation Sub-bituminous coal pyrolysis Reaction paths Primary formation Secondary upgrading

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Evaluation of performance indicators and improvement of a 50 KWEL downdraft gasifier + CHP process in commercial service 28th

Evaluation of performance indicators and improvement of a 50...

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28th European Biomass Conference and Exhibition, e-EUBCE 2020

作者： Denfeld, Dominik Pfeil, Marcel Kühl, Florian Weimer, Patrick Pohl, Sven Technische Hochschule Mittelhessen University of Applied Sciences Institute of Thermodynamics Energy Process Engineering and System Engineering [THESA Italy

Purpose of this paper is to carry out a performance analysis for an existing direct current (DC) gasifier with an electrical output of 50 kW. Feedstock species are biogenic residues such as landscape conservation wood. Focus of the performance analysis is the determination of the cold gas efficiency. For this purpose, the fuel-specific properties of the feedstock must be investigated and all process-determining parameters must be measured. Based on the achieved data the entire process chain from biomass feed-in system over the gasifier unit up to the block-type power generation must be evaluated. In the end a mathematical model shall be developed to provide in-situ performance indicators for plant operators. © 2020, ETA-Florence Renewable Energies. All Rights Reserved.

关键词： Biomass Cold-gas-efficiency Gasification

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A comparative study on accurate prediction of cavitation characteristics for head drop in a mixed-flow pump with steady- And unsteady-state analysis

A comparative study on accurate prediction of cavitation cha...

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作者： Kim, Yong-In Kim, Sung Yang, Hyeon-Mo Lee, Kyoung-Yong Lee, Yong-Kab Choi, Young-Seok Green Process and Energy System Engineering University of Science and Technology Daejeon Korea Republic of Thermal and Fluid System R&D Group Korea Institute of Industrial Technology Cheonan Korea Republic of Anflux Co. Ltd. Seoul Korea Republic of

The cavitation characteristics for the head drop in a mixed-flow pump were investigated with the steady- and unsteady-state analysis. Two mixed-flow pump models exhibiting a different incidence angle were analyzed under the cavitation condition. The model with a larger incidence angle obtains relatively poor suction performance. Moreover, the steady-and unsteady-state analysis indicate different head level under the cavitation condition. The results of the unsteady-state analysis are more accurate to the experimental results. The head of a fully convergent steady-state analysis is not even distributed in the head fluctuation range of the unsteady-state analysis. However, the head drop due to the decrease of inlet pressure has almost the same distribution and gradient. In addition, the amount and shape of the bubbles were presented with the time variation, which were also compared with the averaged result of steady-state analysis. The bubbles show a larger oscillation in the model which has a larger incidence angle. The oscillation of the bubbles is related to the magnitude of the head fluctuation. © Published under licence by IOP Publishing Ltd.

关键词： Cavitation

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Planar mapping of the liquid fraction of froth using ultrasound Flächige Darstellung des Wassergehaltes von Schaum mittels Ultraschall 21

Planar mapping of the liquid fraction of froth using ultraso...

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21. ITG/GMA-Fachtagung Sensoren und Messsysteme - 21st ITG/GMA Conference on Sensors and Measuring systems

作者： Emmerich, Hannes Knüpfer, Leon Trtik, Pavel Eckert, Kerstin Heitkam, Sascha Starke, Eric Weik, David Büttner, Lars Czarske, Jürgen Technical University Dresden Laboratory of Measurement and Sensor System Techniques Dresden01069 Germany Helmholtz-Zentrum Dresden-Rossendorf Institute of Fluid Dynamics Dresden01328 Germany Paul Scherrer Institut Laboratory for Neutron Scattering and Imaging Villigen5232 Switzerland Technical University Dresden Institute of Process Engineering and Environmental Technology Dresden01069 Germany SICK Engineering GmbH Bergener Ring 27 Ottendorf-Okrilla01458 Germany

ISBN: (纸本)9783800758364

Flotation processes are essential processes for resource separation, the monitoring of which can save vast amounts of water and energy. To control them, it is necessary to measure the phase fractions present in the froth. Currently, no suitable measurement method exists that can be easily integrated into the existing process and has a penetration depth of more than 5 cm. Therefore, in this paper we present a measurement system for determining the liquid distribution in foam using ultrasound. To counteract the strong attenuating effect of the foam on the ultrasound, we use low-frequency probes with a center frequency of 135 kHz. Electrodes determine an integral liquid fraction by conductivity measurement. Within a liquid range of 0.17 ·10−2 to 0.82 ·10−2, the measurement system was first calibrated for a penetration depth of 9.2 cm and validated by simultaneous neutron imaging. An absolute and relative measurement uncertainty of 0.23 ·10−2 and 42.5 % was the respective result. A resolution of 7.5 mm in the axial, 13 mm in lateral direction and 1 Hz in time were obtained. In a dynamic inhomogeneous case, the measurement system was additionally validated for a use case. This investigation represents a first step towards process optimization in flotation processes. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Ultrasonics

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A new method of Ionic Fragment Contribution-Gradient Boosting Regressor for predicting the infinite dilution activity coefficient of dichloromethane in ionic liquids

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Fluid Phase Equilibria 2023年 564卷

作者： Li, Kaikai Chang, Fei Shi, Sensen Jiang, Chongyang Bai, Yinge Dong, Haifeng Meng, Xianghai Wu, Jeffery C.S. Zhang, Xiangping CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex System Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China College of Chemical and Engineering University of Chinese Academy of Sciences Beijing 100049 China College of Chemical Engineering and Environment China University of Petroleum Beijing 102249 China Langfang Green Industrial Technology Center Langfang06500 China Department of Chemical and Engineering National Taiwan University Taipei10617 Taiwan

Ionic liquids (ILs) have shown huge potential advantages as solvents to absorb and recover dichloromethane (DCM) from waste gasses. The infinite dilution activity coefficient (γ∞) of DCM in ILs is an important parameter, which can be used to predict the vapor-liquid equilibrium of DCM-IL systems. In this work, a new model of calculating the γ∞ of DCM in ILs is established based on ionic fragments contribution (IFC) and gradient boosting regressor (GBR) algorithm. IFC is used to obtain the surface charge density distribution area of ILs (Sσ-profile) that is the input of GBR. GBR is used to learn the mapping relationship between input feature and γ∞ of DCM in ILs. The database of the γ∞ of DCM in ILs composed of 29 cations and 22 anions includes 72 experimental data and 421 COSMO calculation data, which was employed to establish the IFC-GBR model and predict the γ∞ of DCM in ILs. The coefficient of determination (R2) and mean absolute error (MAE) of the IFC-GBR model test set are 0.9703 and 0.0519, respectively. Also, this model has excellent generalization capability of predicting evidenced by high 10-fold cross-validation coefficients of determination in the range 0.9474–0.9481. These results indicate that the proposed model can accurately predict γ∞ of DCM in ILs, then provide the important data for developing a new process of absorbing and desorbing DCM by IL-based technologies. © 2022

关键词： Ionic liquids

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A systematic Review of Urban Design and Computer Modelling Methods to Support Smart City Development in a Post-COVID Era

A Systematic Review of Urban Design and Computer Modelling M...

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International Conference on Green Building, Civil engineering and Smart City, GBCESC 2022

作者： Yang, Liu Iwami, Michiyo Chen, Yishan Wu, Mingbo van Dam, Koen H. School of Architecture Southeast University Nanjing China Department of Infectious Disease Faculty of Medicine Imperial College London London United Kingdom Architecture and Urban Design Research Center China IPPR International Engineering Co. Ltd Beijing China University of Chinese Academy of Sciences Beijing China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China Centre for Process Systems Engineering Department of Chemical Engineering Imperial College London London United Kingdom

ISBN: (纸本)9789811952166

The COVID-19 pandemic emphasised the need for decision-support tools to assist urban designers in building resilient and smart cities. Therefore, a multi-disciplinary systematic review was conducted following the PRISMA guideline to identify papers relevant for selecting appropriate methodologies that can be applied to build decision-support tools for resilient cities. This paper presents a list of 109 key references, selected from 8,737 records found from the searches, and identified major research themes, fundamental design interventions, and computer modelling techniques. We extracted six groups of interventions categorised by different scales of action: from an individual, crowds (social distancing and travel-related interventions), to a building, a neighbourhood/district, and a city. In addition, there are three sorts of computational modelling approaches, i.e., computer simulation, statistical models, and AI algorithms. Most of the studies developed models for predictive purposes, and 28% of the modelling studies built models for descriptive purposes. This work intends to empower urban designers and planners to overcome and get prepared for unpredictable disasters in pursuit of resilient and smart cities, particularly in the post-pandemic world. This review enables them to quickly find relevant papers as well as suitable methodologies and tools for a particular research purpose. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Smart city

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Comparing the climate change mitigation potentials of alternative land uses:Crops for biofuels or biochar *** regrowth

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Geography and Sustainability 2022年第4期3卷 347-357页

作者： Anne Cecilie Løvenskiold Xiangping Hu Wenwu Zhao Francesco Cherubini Department of Energy and Process Engineering Industrial Ecology ProgrammeNorwegian University of Science and Technology(NTNU)TrondheimNorway State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Institute of Land Surface System and Sustainable Development Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China

Using biomass from dedicated crops for energy production and natural vegetation regrowth are key elements in future climate change mitigation ***,there are still uncertainties about the mitigation potentials that can be achieved by the different land-based systems and how they perform relative to each *** this study,we use harmonized future land use datasets to identify global land areas dedicated to second generation bioenergy crop production in 2050 under different climate *** then assess the global climate change mitigation potentials of using biomass for producing bioethanol with(BECCS)or without carbon capture and storage,biochar,or a synthetic fuel(e-methanol).For the latter,the electricity required to produce hydrogen for e-methanol synthesis is sourced from either wind power or the projected average electricity mix in *** potential from natural regrowth on the identified land is also *** all the cases,we modelled emissions of greenhouse gases from the life-cycle stages and use parameterized models to estimate local biomass growth *** identified land areas range from 1.95 to 13.8 million hectares and can provide from 30 to 178 mega ton(Mt)dry biomass annually from dedicated *** change mitigation potentials range from 11 to 257 MtCO_(2)-***^(−1),depending on technological option and land *** largest mitigation is delivered by BECCS,but e-methanol can achieve similar findings when hydrogen is sourced from wind *** hydrogen is produced from grid electricity,e-methanol can result in net positive emissions.E-methanol can also deliver more final energy than bioethanol(4.04 vs.1.27 EJ yr^(−1)).Natural vegetation regrowth can generally achieve higher mitigation than bioethanol,but less than *** optimal combination of BECCS and natural vegetation regrowth can achieve a larger mitigation,up to 281 MtCO_(2)-***^(−1),indicating that integrated solutions can help to achieve suc

关键词： Negative emission technologies Natural regrowth Land management Bioenergy systems Carbon neutrality

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Updates About the Horizon Europe NEWGEN Research Project for a New Generation of HVDC Insulation Materials, Cables and systems 24

Updates About the Horizon Europe NEWGEN Research Project for...

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24th EEEIC International Conference on Environment and Electrical engineering and 8th I and CPS Industrial and Commercial Power systems Europe, EEEIC/I and CPS Europe 2024

作者： Mazzanti, Giovanni Paajanen, Mika Rytöluoto, Ilkka Wurm, Frederik Harjuhahto, Janne Caprara, Andrea Vergine, Chiara Lahti, Kari Niittymäki, Minna Diban, Bassel Pieroni, Paolo Mourad, Maya Ciroth, Andreas Kannampuzha, Merie Dei University of Bologna Bologna Italy Vtt Technical Research Centre Materials process. circular solutions Tampere Finland TNW-SPC University of Twente Enschede Netherlands Maillefer Extrusion Oy R&d department Vantaa Finland Techimp - Doble Engineering R&d department Bologna Italy Terna Rete Italia S.p.A Dispatching and Operation Department Roma Italy Tampere University Electrical Engineering Unit Tampere Finland Hv Cable system SuperGrid Institute Villeurbanne France GreenDelta Berlin Germany Clic Innovation Oy Helsinki Finland

ISBN: (纸本)9798350355185

This article describes the updates about the HEU NEWGEN research project1, after 18 months since its start. The NEWGEN project aims at developing and proofing a new generation of extruded HVDC cable systems, including not only novel insulating materials, but also new manufacturing, monitoring and diagnostics techniques, as well as models for life and reliability of the cable systems. Such generation of HVDC cables is believed to contribute to a reliable and resilient European transmission grid. © 2024 IEEE.

关键词： Power cables

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