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Evaluating CO2 desorption performance of MEA solution with MnOx/HZ catalytic packings by visualization method

CHEMICAL ENGINEERING JOURNAL 2024年 479卷

作者： Liu, Jian Kong, Chengdong Jiang, Yanchi Wu, Xiaojiang Liao, Xiangyun Zeng, Shaojuan Wang, Tao Fang, Mengxiang Zhang, Zhongxiao Shanghai Jiao Tong Univ Inst Thermal Energy Engn Shanghai 200240 Peoples R China Shanghai Jiao Tong Univ Coll Smart Energy Shanghai 200240 Peoples R China Shanghai Noncarbon Energy Convers & Utilizat Inst Shanghai 200240 Peoples R China Chinese Acad Sci Inst Proc Engn Beijing Key Lab Ion Liquids Clean Proc State Key Lab Multiphase Complex Syst Beijing 100190 Peoples R China Zhejiang Univ State Key Lab Clean Energy Utilizat Hangzhou 310027 Peoples R China

The high energy consumption in the CO2 desorption process is one of the main issues of the chemical absorption method. To address this issue, a MnOx modified HZSM-5 catalyst (MnOx/HZ) was prepared by impregnation method and used as catalytic packing to improve the CO2 desorption rate in the monoethanolamine (MEA) solution. Since the catalytic effects mainly work around the catalytic packing, a visualization method, which can measure the CO2 desorption rate per unit surface area (v(CO2/area)) of a single packing, is proposed to avoid some uncertain effects occurring as the conventional bubbling method is used. The results showed that the v(CO2/area) of the MnOx/HZ catalytic packing is 10.06 mu mol center dot cm(-2)center dot s(-1) at 80 degrees C, which is 1.78 times of that of HZSM-5 and 15 to 60 times of that of commercial packings. Actually, the MnOx/HZ has more Bronsted and Lewis acid sites than HZSM-5 according to the pyridine adsorption infrared spectroscopy (Py-IR) characterization. As a result, the apparent activation energy (E-a) of the CO2 desorption reaction with the addition of MnOx/HZ can be reduced by 58.6% and 18% compared with the addition of ceramic saddle ring packing and HZSM-5, respectively. However, the catalytic performance of MnOx/HZ packings degrades gradually due to the blockage of micropores by the reaction product, that needs to be settled in the future.

关键词： Chemical absorption method CO2 desorption MnOx/HZ catalytic packing Acid sites visualization method

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Online temperature-monitoring technology for grain storage: a three-dimensional visualization method based on an adaptive neighborhood clustering algorithm

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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2023年第13期103卷 6553-6565页

作者： Li, Jinpeng Su, Zhiyuan Li, Yanyu Zhao, Huiyi Chen, Xin Beijing Univ Posts & Telecommun Sch Modern Post Sch Automat Beijing 100876 Peoples R China Acad Natl Food & Strateg Reserv Adm Natl Engn Lab Grain Storage & Logist Beijing Peoples R China Acad State Adm Grain Informatizat Promot Off Beijing Peoples R China

BACKGROUNDPost-harvest quality assurance is a crucial link between grain production and end users. It is essential to ensure that grain does not deteriorate due to heating during storage. To visualize the temperature distribution of a grain pile, the present study proposed a three-dimensional (3D) temperature field visualization method based on an adaptive neighborhood clustering algorithm (ANCA). The ANCA-based visualization method contains four calculation modules. First, discrete grain temperature data, obtained by sensors, are collected and interpolated using back propagation (BP) neural networks to model the temperature field. Then a new adaptive neighborhood clustering algorithm is applied to divide interpolation data into different categories by combining spatial characteristics and spatiotemporal information. Next, the Quickhull algorithm is used to compute the boundary points of each cluster. Finally, the polyhedrons determined by boundary points are rendered into different colors and are constructed in a 3D temperature model of the grain pile. RESULTSThe experimental results show that ANCA is much better than the DBSCAN and MeanShift algorithms on compactness (around 95.7% of tested cases) and separation (approximately 91.3% of tested cases). Moreover, the ANCA-based visualization method for grain pile temperatures has a shorter rendering time and better visual effects. CONCLUSIONThis research provides an efficient 3D visualization method that allows managers of grain depots to obtain temperature field information for bulk grain visually in real time to help them protect grain quality during storage. (c) 2023 Society of Chemical Industry.

关键词： post-harvest quality assurance visualization method temperature modeling grain storage

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A visualization method of Quantifying Carbon Combustion Energy in the Sintering Packed Bed

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ISIJ INTERNATIONAL 2021年第6期61卷 1801-1807页

作者： Sun, Chengfeng Yang, Yizhang Xu, Yang Liao, Zhehan Pei, Yuandong Zhou, Qi Lv, Xuewei Xu, Jian Chongqing Univ Coll Mat Sci & Engn Chongqing 400044 Peoples R China Zenith Steel Grp Co Ltd Changzhou 213001 Peoples R China Baogang Zhanjiang Iron & Steel Co Ltd Zhanjiang 524072 Peoples R China Chongqing Univ Chongqing Key Lab Vanadium Titanium Met & Adv Mat Chongqing 400044 Peoples R China

Carbon combustion provides energy to reach essential temperatures in the sintering packed bed. A visual and quantitative evaluation on the energy input distribution inside the bed is urgently demanded to learn energy-saving potential of sintering process and subsequently to suppress greenhouse gas emission. Herein, after a two-dimensional simplified model of sintering packed bed is established and validated against the temperature measurements on the sintering pot experiment, this work highlights a mesh based visualization method of quantifying carbon combustion energy in the packed bed. To be more specific, local transient temperature distributions in all meshed grids are first extracted from numerical simulation results. Then each grid is colorized according to the specific criteria on five pre-defined energy input (El) states. As a result, the effects of carbon segregation and cross-sectional shape on the energy efficiency of sintering packed bed are quantitatively compared and optimized. These two case studies not only demonstrate the principle, process, and application of the proposed visualization method, but also stimulate its future potential in various areas.

关键词： visualization method carbon combustion energy sintering packed bed carbon segregation cross-sectional shape

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The experimental and simulation investigation of the dynamic characteristic of submicron-scale aerosol in high-voltage electric field by a visualization method

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JOURNAL OF HAZARDOUS MATERIALS 2021年 416卷 126227-126227页

作者： Zhu, Yong Tao, Shanlong Chen, Chen Liu, Jiahua Chen, Mingxia Shangguan, Wenfeng Shanghai Jiao Tong Univ Sch Mech Engn Res Ctr Combust & Environm Technol Shanghai 200240 Peoples R China

The high-voltage electric field can effectively capture charged aerosols and has the effect of killing microbial aerosols simultaneously. In this article, an innovative visualization method for investigating the dynamic characteristic of submicron-scale aerosol particles in the high-voltage electric field is developed. Based on reasonable working principles and reliable experimental schemes, the movement of submicron-scale aerosol particles is observed and visualization images in different working conditions are photographed. Besides, with the aid of numerical method and solution of related equations, simulation researches on flow field distribution, electrostatic field characteristics, particle charging and motion behavior characteristics are also carried out. visualization results prove the linear motion law of aerosol particles in an electric field of 0-3 kV/cm unit. As for 1 & micro;m diameter particle, its migration velocity in 1 kV/cm electric field is measured as 0.016 m/s and 0.019 m/s after positive and negative charging of 1.5 kV voltage, respectively. A reliable calculation formula (eta = (VjqpLj)/(3 pi mu D2uxdp)) for predicting collection efficiency is derived and established based on actual particle migration velocity. The researches on the migration and capture law of submicron-scale aerosol in the high voltage electric field gives a key reference for the development and design of efficient removal of microbial aerosol and air purification equipment.

关键词： visualization method Submicron-scale aerosol Dynamic characteristic High-voltage electric field Calculation formula

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visualization method for detecting of residual stress using magnetic domain scope

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INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS 2016年第3-4期52卷 1213-1219页

作者： Terashima, Kenichi Ishiwata, Makoto Suzuki, Kenji Yamaguchi, Katsuhiko Uchimoto, Tetsuya Takagi, Toshiyuki Fukushima Univ Fac Symbiot Syst Sci Kanayagawa 1 Fukushima 9601296 Japan Tohoku Univ Inst Fluid Sci Sendai Miyagi Japan

A visualization method is proposed for detecting of residual stress in stainless steels using a magnetic domain scope combined with mu-MOKE measurement system. Grains and local residual stress places such as Luders band on metal surfaces are clearly observed by this method. Moreover, different magnetic hysteresis curves were measured for each grain. A Monte Carlo simulation was performed for the analysis of the observation results. As a result, this method has possibility of a new magnetic non-destructive evaluation for fatigue of Austenitic stainless steels.

关键词： visualization method magnetic domain Austenitic stainless steels non-destructive evaluation Monte Carlo simulation

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visualization method for Efficient Expression of Spatial Information 6

Visualization Method for Efficient Expression of Spatial Inf...

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6th International Conference on IT Convergence and Security (ICITCS)

作者： Kim, Min Gyu Lee, Moo Hun Hankuk Univ Foreign Studies WISE Inst Meteorol Convergence Serv Lab Gyeonggi Do South Korea

ISBN: (纸本)9781509037650

A visualization algorithm for efficiently expressing spatial information based on web map services is developed in this research. Spatial information has a limited ability for expressing the desired information not only because it requires considerable time to express itself through a map as it is composed of complex points such as lines and polygons, but also because it has to utilize an OpenAPI that has a limitations in web map services. Therefore, the visualization method suggested in this research opens and imports only a partial data of the desired area, and it expresses the expanded data through the event detections of client-based map movements. As a result, the time required for an expression could be reduced;thus, it is ascertained that this method will be efficient for system I/O's also, because it does not import unnecessary information.

关键词： visualization method Web Map Service Standard NodeLink

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Research on visualization methods for Marine Environmental Element Fields in Twin Spaces

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JOURNAL OF MARINE SCIENCE AND ENGINEERING 2025年第3期13卷 449-449页

作者： Li, Lianwei Wu, Shiyu Xue, Cunjin Ma, Yingying Qin, Qunce China Univ Petr Coll Oceanog & Space Informat Qingdao 266580 Peoples R China Chinese Acad Sci Aerosp Informat Res Inst Int Res Ctr Big Data Sustainable Dev Goals Beijing 100094 Peoples R China Chinese Acad Sci Aerosp Informat Res Inst Key Lab Digital Earth Sci Beijing 100094 Peoples R China Qingdao Binhai Univ Acad Arts & Commun Qingdao 266555 Peoples R China

visualization of marine environmental field elements is one of the core technologies in marine science research. Particularly in the context of "digital twin of the ocean" (DTO) construction and application, accurately reproducing the dynamic evolution of marine environmental elements remains a critical challenge. Existing visualization methods are primarily limited to static displays and fail to achieve deep integration and dynamic expression of marine environmental elements and sea conditions. To address this, this paper proposes a new visualization method for marine environmental element fields in a twin-space framework. This method first constructs dynamic wave twin objects based on wave data, then develops a marine environmental element field model based on environmental element data, and finally generates a coupled marine environmental element twin object through integration. This approach facilitates the dynamic and collaborative visualization of multiple marine elements. The collaborative visualization results of wave information, ocean surface temperature, and salinity data indicate that this method effectively enhances the dynamic expression capability and information fusion level of the ocean environment feature field. It provides new ideas and approaches for the development of ocean environment visualization technology in twin spaces, with promising application potential.

关键词： twin space wave twin marine environmental element field coupling visualization method

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Comparison of vibration visualization methods for classification of chaos based on CNN

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JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY 2022年第6期36卷 2749-2757页

作者： Nam, Jaehyeon Kang, Jaeyoung Kongju Natl Univ Adv Motor Parts Reg Innovat Ctr Cheonan 31080 South Korea Inha Univ Dept Mech Engn Incheon 22212 South Korea

This study assessed methods for visualizing the vibrations for chaotic systems using a time series, fast Fourier transform (FFT), threshold recurrence plot, and unthresholded recurrence plot. The image classification was then performed using CNN, and the accuracy of each visualization method was compared and analyzed. The nonlinear behavior of chaotic systems was examined using the commonly known Van der pol, Rossler, and Duffing equations. The Lyapunov exponent was calculated for each model parameter change to determine the chaos. The classification accuracy was examined for the chaotic signal in each visualization method of the proposed architecture based on VGG 16 using the determined label and image. The classification accuracy for the chaos of each visualization method is the result of signals mixed randomly five times. FFT analysis showed the highest evaluation result.

关键词： Vibration Chaos Classification CNN visualization method

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Selection framework of visualization methods in designing AR industrial task-support systems

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COMPUTERS IN INDUSTRY 2023年 145卷

作者： Tainaka, Keishi Fujimoto, Yuichiro Sawabe, Taishi Kanbara, Masayuki Kato, Hirokazu Nara Inst Sci & Technol 8916-5 Takayama cho Ikoma Nara 6300192 Japan

An Augmented reality (AR) task-support system incorporates head-mounted displays (HMDs) to improve human performance in maintenance, assembly, and disassembly tasks by intuitively showing the working procedure to the operator. To achieve the intended AR capability and to enable the operator to work efficiently, a system designer must understand the characteristics of AR and design the information to be shown operators for each subtask, taking into account the working situation represented by the procedure, operator performance skills, workspace, devices, and operating objects (i.e., AR information design). Especially, in the AR information design, the designer needs AR expertize to select the suitable visualization method among the many extant methods. This is difficult for designers (manual writers) to perform AR information design in factories in the future. However, at present, only a few studies have been conducted to select the suitable visualization method for each subtask. This study proposes to define 31 subtask types as criteria for decomposing tasks in AR information design. Furthermore, we classify and define 42 visualization methods in terms of AR information design. Finally, to select the suitable visualization method for each subtask, we construct a selection framework consisting of three selection categories representing the working status and 17 selection conditions. The evaluation experiments of the proposed framework could output an average of 4.3 suitable visualization method candidates, including at least one suitable visualization method selected by AR experts in the subtask working situation. By incorporating the proposed framework into a website and combining it with existing HMDs and services for AR application development, it is expected that designers will be able to develop appropriate AR task-support systems.

关键词： Augmented reality AR information design Manufacturing visualization method

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EICP-enhanced fracture healing: bridging microfluidic observations and macroscale applications

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GEOTECHNIQUE 2024年

作者： Zhao, Chang Xiao, Yang He, Xiang Cui, Hao Liu, Hanlong Chongqing Univ Sch Civil Engn Chongqing Peoples R China Nanyang Technol Univ Sch Civil & Environm Engn Singapore Singapore

Bio-mediated carbonate precipitation is crucial in mineral formation and geological evolution, with Enzymatically Induced Carbonate Precipitation (EICP) gaining attention for its potential in fracture healing. This study explored the effectiveness of EICP technique in healing fractures across micro-to-macro scales. The pore-scale healing process of real rock fractures was observed in rock-based micromodels. Heterogeneous nucleation sites tend to form on the rock interfaces and subsequently facilitate crystal growth. Moreover, the distribution of precipitates along an extended microchannel was analyzed to examine the microscale non-uniformity issues related to biocementation. The interaction between flow dynamics and precipitation was employed to interpret the mechanisms underlying fracture healing via biocementation. For a broader macroscale perspective, temporal-spatial distribution of precipitates was visualized by conducting grouting tests within an artificial fracture between transparent glass plates, recorded through time-lapse photography. These visual findings were further validated through column-scale tests involving fractured limestone rock samples, showing that precipitated CaCO3 reduced permeability reduction and caused pore clogging. By cross-referencing microfluidic findings with outcomes of macroscale experiments, the study demonstrates the consistency of size-scale and continuity of time-scale effects across various scales, enhancing the comprehension of EICP process across various scales, and validating the potential of biocementation in fracture healing.

关键词： bio geotechnics micro-to-macro scale crystal growth visualization method permeability

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