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Modeling and optimization of a novel power-to-methanol system based on SOEC CO 2 /H 2 O co-electrolysis

Applied Energy 2025年 395卷

作者： Wangning Geng Jiming Yuan Lige Zhang Chunfeng Hong Xinyao Qian Huichao Yao Xian-Long Du Tao Li Xiulin Wang Jian-Qiang Wang Guoping Xiao Key Laboratory of Interfacial Physics and Technology Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 Shanghai 201800 PR China University of Chinese Academy of Sciences Beijing 100049 PR China Engineering Research Center of Large-Scale Reactor Engineering and Technology Ministry of Education State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 PR China CNOOC Gas and Power Group Co. Ltd Beijing 100020 China

Power-to-liquid (PtL) by high temperature co-electrolysis technology has emerged as a promising avenue for the transformation and utilization of renewable energy. In this study, a novel process of the Power-to-Methanol (PtM) energy conversion system was developed by integrating the advanced CO 2 capture process, CO 2 /H 2 O co-electrolysis process by solid oxide electrolysis cell (SOEC) and Fischer-Tropsch synthesis process in turn, in which SOEC mechanism model for co-electrolysis was established and validated. As amult-process system with high-temperature, endothermic and exothermic processes, from the perspective of maximizing energy utilization, the heat exchange network of the process flow is optimized, eliminating thermodynamic isolation effects between subsystems. Compared to the subsystems operated independently, the heat and cold demand of the improved system decreased by 34.8 % and 54.8 % respectively, and the energy efficiency of the holistic system increased from 56.2 % to 65.8 %. The results of the exergy analysis show that the overall exergy efficiency of the improved system has increased from 75.3 % to 79.2 %. Through systematic optimization, the proposed system achieves decent thermodynamic performance, exhibiting advantages in consumption of renewable energy.

关键词： Energy conservation and energy efficiency Exergy analysis Heat exchanger network optimization Power-to-methanol SOEC co-electrolysis

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Effect of Cooling Water Flow Path on the Flow and Heat Transfer in a 660 MW Power Plant Condenser

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Journal of Thermal science 2019年第2期28卷 262-270页

作者： ZHONG Dawen MENG Ji'an QIN Peng QIU Xiaolong JIANG Ping LI Zhixin YUAN Fang Beijing Key Laboratory of Passive Safety Technology for Nuclear Energy North China Electric Power University Key Laboratory of Thermal Science and Power Engineering of Ministry of Education School of Aerospace Engineering Tsinghua University Central Southern China Electric Power Design Institute CO.LTD Shanxi Zhaozhuang Xinguang Power Generation CO.LTD School of Energy and Power Engineering Huazhong University of Science and Technology

The effect of the cooling water flow path on the flow and heat transfer in a double tube-pass condenser for a 660 MW power plant unit was numerically investigated based on a porous medium model. The results were used to analyze the streamline, velocity, air mass fraction and heat transfer coefficient distributions. The simulations indicate that the cooling water flow path is important in large condensers. For the original tube arrangement, the heat transfer with the lower-upper cooling water flow path is better than that with the upper-lower cooling water flow path. The reason is that the steam cannot flow into the internal of upper tube bundle and the air fractions are higher in the upper tube bundle with the upper-lower cooling water flow path. An improvement tube arrangement was developed for the upper-lower cooling water flow path which reduced the back pressure by 0.47 kPa compared to the original scheme. Thus, the results show that the tube arrangements should differ for different cooling water flow paths and the condenser heat transfer can be improved for the upper-lower cooling water flow path by modifying the tube arrangement.

关键词： steam surface condenser porous media cooling water flow path condensation computational fluid dynamics

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A DC-Ka-Band 7-Bit Passive Attenuator with Capacitive-Compensation-Based Bandwidth Extension Technique in 55-nm CMOS

A DC-Ka-Band 7-Bit Passive Attenuator with Capacitive-Compen...

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作者： Zhang, Zijiang Li, Nayu Gao, Huiyan Li, Min Wang, Shaogang Kuan, Yen-Cheng Song, Chunyi Yu, Xiaopeng Gu, Qun Jane Xu, Zhiwei Ocean College Institute of Marine Electronics and Intelligent Systems Zhejiang University Zhoushan China College of Information Science and Electronic Engineering Institute of VLSI Design Zhejiang University Hangzhou China Department of Electrical and Computer Engineering University of California at Davis DavisCA United States Engineering Research Center of Oceanic Sensing Technology and Equipment Ministry of Education Zhoushan316021 China Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province Zhoushan316021 China International College of Semiconductor Technology National Chiao Tung University Hsinchu30010 Taiwan

This article presents a 7-bit wideband passive attenuator with low insertion loss (IL) and high attenuation accuracy in 55-nm CMOS technology. The $\pi $ -type and bridge-T-type attenuation units utilize an effective capacitive compensation technique, whose bandwidth extension mechanism is detailed in a single-unit pole-zero analysis. The matching-induced performance deterioration is investigated to minimize amplitude and phase errors at the chip level. The fabricated attenuator demonstrates a 32.4-dB attenuation range with a 0.255-dB resolution and a 3.5-8.4-dB IL from dc to 32 GHz. The measured root-mean-square (rms) amplitude and phase errors are below 0.32 dB and 5.33°, respectively. The attenuator occupies a 0.054-mm2 core area and consumes negligible power. © 1963-2012 IEEE.

关键词： Insertion losses

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Low cost glass-ceramic matrix composites for harsh environment heat exchanger applications

Low cost glass-ceramic matrix composites for harsh environme...

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International SAMPE Conference and Exhibition 2020

作者： Gangloff, John Alms, Justin Holowczak, John Needham, John Sheedy, Paul Yun, Thomas Mosher, Daniel Podhiny, John Sullivan, Brian Haynes, James Jolly, Brian United Technologies Research Center East HartfordCT United States Materials Research and Design Inc. WaynePA United States Oak Ridge National Laboratory Oak Ridge Materials Science and Technology Division TN United States

High-temperature, high-pressure heat exchange is a ubiquitous need in power generation, industrial components and aerospace systems, including supercritical CO2 cycles. In these applications, higher cycle temperatures and pressures provide a significant driver to overall thermal efficiency and fuel consumption as well as a challenge to metallic material capability. To enable operation in these harsh operating regimes, United Technologies Research Center (UTRC), Materials Research and design (MR&D) and Oak Ridge National laboratory (ORNL) are developing a high temperature, lightweight, low-cost heat exchanger technology made from a Glass-Ceramic Matrix Composite (GCMC) material system, denoted UT-16, which is capable of long operational life over a wide range of harsh environments. While this GCMC material system is broadly applicable to a variety of high temperature components, this effort focuses on the development and demonstration of a Counterflow Tube Heat Exchanger (CTHX). The CTHX geometry has been configured specifically for the GCMC material which can be fabricated orders of magnitude faster than most conventional CMCs. The as-fabricated material has extremely low porosity resulting in very low leakage rates and can also be coated with a chemically inert layer for additional protection. © 2020 Soc. for the Advancement of Material and Process Engineering. All rights reserved.

关键词： Costs

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Twinning-Assisted Static Recrystallization and Texture Evolution in A Mg-Gd-Y-Zr Alloy

SSRN

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SSRN 2023年

作者： Jiang, Wenting Ren, Xinyu Yu, Lei Sun, Jingli Ni, Song Huang, Yi Song, Min State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Shanghai Spaceflight Precision Machinery Institute Shanghai201600 China Department of Design and Engineering Faculty of Science and Technology Bournemouth University Poole DorsetBH12 5BB United Kingdom Materials Research Group Department of Mechanical Engineering University of Southampton SouthamptonSO17 1BJ United Kingdom

The formability and mechanical properties of magnesium (Mg) alloys are strongly related to the crystallographic basal texture. Twins play critical roles in adjusting crystallographic orientation of grains during both deformation and annealing treatment via deformation twinning and twinning-assisted recrystallization. In this study, cold rolling and subsequent annealing were conducted on a Mg-5.9Gd-3.3Y-0.5Zr alloy to investigate the recrystallization behavior and texture evolution. Electron backscatter diffraction and transmission electron microscopy techniques were applied to characterize the nucleation of recrystallized grains, especially the twinning-assisted recrystallization, at multi-scales. The results indicate that a large number of [[EQUATION]], [[EQUATION]] twins and [[EQUATION]] double twins were introduced after cold rolling. The [[EQUATION]] double twins, double twin - grain boundary intersections and dense twin-twin intersections are the preferential nucleation sites for recrystallization during annealing treatment, while the coarse and parallel [[EQUATION]] twins are unfavorable for the nucleation of recrystallized grains. Although [[EQUATION]] tension twins are the most common twins in Mg alloys, the interface of this type of twin has strong mobility and is easy to expand. Therefore, it is generally difficult for a single [[EQUATION]] twin to recrystallize. However, the [[EQUATION]] compression twins and[[EQUATION]] double twins are generally difficult to expand and can store high deformation energy, so they are conducive to becoming nucleation sites for recrystallization. During the recrystallization process, the texture type (basal texture) of the cold rolled sample remained unchanged, but the overall texture intensity was significantly reduced due to the dispersion of grain orientations brought by new grains generated by twinning recrystallization. © 2023, The Authors. All rights reserved.

关键词： Textures

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Dual adaptive sampling and machine learning interatomic potentials for modeling materials with chemical bond hierarchy

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Physical Review B 2021年第9期104卷 094310-094310页

作者： Hongliang Yang Yifan Zhu Erting Dong Yabei Wu Jiong Yang Wenqing Zhang State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China University of Chinese Academy of Sciences Beijing 100049 China Department of Physics and Shenzhen Institute for Quantum Science & Engineering Southern University of Science and Technology Shenzhen 518055 China Guangdong Provincial Key Lab for Computational Science and Materials Design and Shenzhen Municipal Key-Lab for Advanced Quantum Materials and Devices Southern University of Science and Technology Shenzhen 518055 China Materials Genome Institute Shanghai University Shanghai 200444 China

The development of reliable and flexible machine learning based interatomic potentials (ML-IPs) is becoming increasingly important in studying the physical properties of complex condensed matter systems. Besides the structure descriptor model for total energy decomposition, the trial-and-error approach used in the design of the training dataset makes the ML-IP hardly improvable and reliable for modeling materials with chemical bond hierarchy. In this work, a dual adaptive sampling (DAS) method with an on the fly ambiguity threshold was developed to automatically generate an effective training dataset covering a wide temperature range or a wide spectrum of thermodynamic conditions. The DAS method consists of an inner loop for exploring the local configuration space and an outer loop for covering a wide temperature range. We validated the developed DAS method by simulating thermal transport of complex materials. The simulation results show that even with a substantially small dataset, our approach not only accurately reproduces the energies and forces but also predicts reliably effective high-order force constants to at least fourth order. The lattice thermal conductivity and its temperature dependence were evaluated using the Green-Kubo simulations with ML-IP for CoSb3 with up to third-order phonon scattering, and those for Mg3Sb2 with up to fourth-order phonon scattering, and all show good agreements with experiments. Our work provides an avenue to effectively construct a training dataset for ML-IP of complex materials with chemical bond hierarchy.

关键词： Interatomic & molecular potentials Lattice thermal conductivity Machine learning

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Study on Photocatalytic, Electric, and Sensing Behavior of Co- and Ag- Codoped Tin Dioxide (Sno2) Nano Particles

SSRN

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SSRN 2023年

作者： Zhang, Qiang Zou, Xiao Wang, Yan Habibi, Mostafa Shaanxi Key Laboratory of Catalysis School of Chemistry and Environmental Science Shaanxi University of Technology Shaanxi Hanzhong723001 China School of Pharmacy Shaanxi Institute of International Trade & Commerce Shaanxi Xianyang712046 China Faculty of Architecture and Urbanism UTE University Calle Rumipamba S/N and Bourgeois Quito Ecuador Center of Excellence in Design Robotics and Automation Department of Mechanical Engineering Sharif University of Technology Azadi Avenue P.O. Box 11365-9567 Tehran Iran Department of Biomaterials Saveetha Dental College and Hospital Saveetha Institute of Medical and Technical Sciences Chennai600 077 India

The role of Co and Ag codoping on the electric, optical, and sensing performance of tin dioxide nano particles was investigated. Co-Ag codoping reduced particle size from 51.8 nm to 41.6 nm and the unit cell dimensions changed. Overall, Co and Ag resulted in significant rise in oxygen vacancy of SnO2 so that defects compensate unbalanced electron charge induced by dopants. It was also figured out that Co-Ag codoping improved the conductivity of SnO2 at low and high temperatures. Doping Led to decrement in the band gap energy of SnO2 from 3.66 eV to 3.07 eV, which shows improved optical properties of the compound. Study on photodegradation activity of SnO2 showed up to 97. % enhancement due to Co-Ag co-doping. Finally, the sensor response of the compound revealed that the response intensity of tin dioxide increased significantly when 4 wt.% Co and 2 wt. % Ag are doped into it. © 2023, The Authors. All rights reserved.

关键词： Photocatalytic activity

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Assessment and Optimization of a Single Flash Geothermal System Recovered by a Trans-Critical Co2 Cycle Using Different Scenarios

SSRN

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SSRN 2023年

作者： Lamagna, Mario Aryanfar, Yashar Hoseinzadeh, Siamak Nastasi, Benedetto Garsia, Davide Astiaso Mohtaram, Soheil Sun, Hong Guang State Key Laboratory of Hydrology-Water Recourses and Hydraulic Engineering International Center for Simulation Software in Engineering and Sciences College of Mechanics and Materials Hohai University Jiangsu Nanjing210098 China Universidad Autónoma de Ciudad Juárez Mexico Department of Planning Design and Technology of Architecture Sapienza University of Rome Rome00196 Italy Department of Earth Sciences and Forecasting Research Center Prevention and Control of Geological Risks China Department of Earth Sciences and Forecasting Research Center Prevention and Control of Geological Risks China School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China

Globally, the use of renewable energy, particularly geothermal energy, is rising quickly. Geothermal cycles' low efficiency has repeatedly shown how crucial it is to recover heat lost during these cycles. This study suggests a combined power generation cycle replicating using the EES software environment that combines a single flash cycle with a trans-critical carbon dioxide cycle. The findings demonstrate that, in comparison to the BASIC single flash cycle, the design characteristics of the proposed system are greatly improved. The suggested strategy is then enhanced by employing the genetic algorithm, the Nelder-Mead Simplex method, and the direct algorithm. Separator pressure, steam turbine outlet pressure, and carbon dioxide turbine inlet pressure are three assumed variable parameters, and exergy efficiency is the target parameter. In the default operating mode, the system exergy efficiency is 32.46%, increasing to 39.21% using the genetic algorithm and 36.16% using the Nelder-Mead method and 38.82% using the direct algorithm. © 2023, The Authors. All rights reserved.

关键词： Genetic algorithms

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Optimization for Offshore Prestressed Concrete-Steel Hybrid Wind Turbine Support Structure with Pile Foundation Using a Parallel Updated Particle Swarm Algorithm

SSRN

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SSRN 2023年

作者： Li, Zeyu Xu, Bin Yuan, Guokai Chen, Hongbing College of Civil Engineering Hunan University Hunan Changsha410082 China College of Civil Engineering Huaqiao University Xiamen361021 China Key Laboratory for Intelligent Infrastructure and Monitoring of Fujian Province Huaqiao University Xiamen361021 China Energy Engineering Group Guangdong Electric Power Design Institute Co. Ltd. Guangzhou510663 China School of Civil and Resource Engineering University of Science and Technology Beijing100084 China

This paper developed an offshore prestressed concrete-steel hybrid (PCSH) wind turbine support structure with pile foundation for at soft soil. Taking a 5.5 MW wind turbine support structure as an example, optimal design of the support structure with pile foundation is carried out considering the soil-structure interaction (SSI) and the effect of water pressure. The levelized cost of energy (LCOE) of the proposed PCSH support structure is treated as the objective function and minimized with a parallel updated particle swarm optimization (PUPSO) algorithm and a penalty function strategy where the physical dimensions of each part of the PCSH wind turbine support structure are treated as optimization variables. Eleven optimization constraints are considered under both the serviceability limit state (SLS) and the ultimate limit state (ULS) according to relevant specifications and industry standards. The mechanical behavior and the LCOE of the optimal PCSH support structure with pile foundation is analyzed and is compared with them of the original design with traditional steel tube tower and jacket substructure. Results show that the LCOE of the optimized PCSH support decreases obviously and can provide advanced mechanic behavior including natural frequency, top deformation, and anti-overturning capacity. © 2023, The Authors. All rights reserved.

关键词： Prestressed concrete

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Projection micro stereolithography based 3D printing and its applications

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International Journal of Extreme Manufacturing 2020年第2期2卷 68-86页

作者： Qi Ge Zhiqin Li Zhaolong Wang Kavin Kowsari Wang Zhang Xiangnan He Jianlin Zhou Nicholas X Fang Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055GuangdongPeople’s Republic of China BMF Material Technology Inc. Shenzhen 518110ShenzhenPeople’s Republic of China State-Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082HunanPeople’s Republic of China Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMA 02139-4307United States of America Digital Manufacturing and Design Centre Singapore University of Technology and Design487372Singapore

Projection micro stereolithography(PμSL)is a high-resolution(up to 0.6μm)3D printing technology based on area projection triggered photopolymerization,and capable of fabricating complex 3D architectures covering multiple scales and with multiple *** paper reviews the recent development of the PμSL based 3D printing technologies,together with the related *** introduces the working principle,the commercialized products,and the recent multiscale,multimaterial printing capability of PμSL as well as some functional photopolymers that are suitable to Pμ*** review paper also summarizes a few typical applications of PμSL including mechanical metamaterials,optical components,4D printing,bioinspired materials and biomedical applications,and offers perspectives on the directions of the further development of PμSL based 3D printing technology.

关键词： projection microstereolithography multiscale 3D printing multimaterial 3D printing

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