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Multiphysics simulation and optimization of the in-situ beneficiation process of ilmenite minerals from lunar regolith

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Science China Earth Sciences 2025年第1期68卷 195-207页

作者： Peng ZHANG Xin LIU Guanghui LIU Wei DAI Hanzhe YANG haibo zheng Zhi WANG Ran NIU Yifan BAI Yang ZHANG Chengbao LIU Ge YANG Junwei YANG Guang ZHANG Technology and Engineering Center for Space Utilization Chinese Academy of Sciences Beijing Hegong Simulation Co. Ltd

The exploration and utilization of lunar resources have become the major objectives of future lunar exploration missions. The classified collection and processing of lunar minerals is the basic prerequisite for the in-situ exploration and utilization of lunar resources. In this study, we propose a scheme for in-situ separation of magnetic minerals from lunar soils using the dry magnetic separation method. The scheme can realize the purpose of separating magnetic minerals from lunar regolith by altering the motion trajectory of lunar regolith particles with different magnetic properties. Detailed modeling of the dry magnetic separation device is conducted, and the three-dimensional distribution of magnetic parameters is calculated and analyzed. Based on the characterization and analysis of the Chang E-5's samples, the morphologies and physical parameters of lunar regolith particles are modeled and simulated. A discrete element simulation of the motion process of lunar regolith particles under multi-physical field conditions is performed, and the influences of key parameters on the beneficiation performance of lunar magnetic minerals are investigated. Our results indicate that optimal separation and beneficiation of lunar regolith particles can be achieved under specific conditions of magnetic field strength and drum speed. Additionally, we analyze the effects of lunar weak gravity conditions and the charged nature of lunar particles on the beneficiation process, showing that these factors can obviously enhance the beneficiation process of lunar ilmenites. This study demonstrates the feasibility of using the dry magnetic separation method for the beneficiation of magnetic minerals from lunar regolith, providing a theoretical basis for the scientific tasks of collecting, processing, and utilizing lunar mineral resources.

关键词： Lunar regolith In-situ resource utilization Magnetic separation Classified sampling

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Two-component Brownian coagulation: Monte Carlo simulation and process characterization

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Particuology 2011年第4期9卷 414-423页

作者： haibo Zhao Chuguang zheng State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Wuhan 430074 Hubei China

The compositional distribution within aggregates of a given size is essential to the functionality of com- posite aggregates that are usually enlarged by rapid Brownian coagulation, There is no analytical solution for the process of such two-component systems, Monte Carlo method is an effective numerical approach for two-component coagulation, In this paper, the differentially weighted Monte Carlo method is used to investigate two-component Brownian coagulation, respectively, in the continuum regime, the free-molecular regime and the transition regime. It is found that （1） for Brownian coagulation in the continuum regime and in the free-molecular regime, the mono-variate compositional distribution, i.e., the number density distribution function of one component amount （in the form of volume of the component in aggregates） satisfies self-preserving form the same as particle size distribution in mono-component Brownian coagulation; （2） however, for Brownian coagulation in the transition regime the mono-variate compositional distribution cannot reach self-similarity; and （3） the bivariate compositional distribution, i.e., the combined number density distribution function of two component amounts in the three regimes satisfies a semi self-preserving form. Moreover, other new features inherent to aggregative mixing are also demonstrated; e.g., the degree of mixing between components, which is largely controlled by the initial compositional mass fraction, improves as aggregate size increases.

关键词： Multivariate population balance Aggregation Stochastic method Mixing Self-preserving

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Monte Carlo simulation for simultaneous particle coagulation and deposition

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Science China(Technological Sciences) 2006年第2期49卷 222-237页

作者： ZHAO haibo zheng Chuguang State Key Laboratory of Coal Combustion Huazhong University of Science & Technology Wuhan 430074 China State Key Laboratory of Coal Combustion Huazhong University of Science & Technology Wuhan 430074 China

The process of dynamic evolution in dispersed systems due to simultaneous particle coagulation and deposition is described mathematically by general dynamic equation (GDE). Monte Carlo (MC) method is an important approach of numerical solu- tions of GDE. However, constant-volume MC method exhibits the contradictory of low computation cost and high computation precision owing to the fluctuation of the number of simulation particles; constant-number MC method can hardly be applied to engineering application and general scientific quantitative analysis due to the continual contraction or expansion of computation domain. In addition, the two MC methods depend closely on the “subsystem” hypothesis, which constraints their expansibility and the scope of application. A new multi-Monte Carlo (MMC) method is promoted to take account of GDE for simulta- neous particle coagulation and deposition. MMC method introduces the concept of “weighted fictitious particle” and is based on the “time-driven” technique. Furthermore MMC method maintains synchronously the computational domain and the total number of fictitious particles, which results in the latent expansibility of simulation for boundary con- dition, the space evolution of particle size distribution and even particle dynamics. The simulation results of MMC method for two special cases in which analytical solutions exist agree with analytical solutions well, which proves that MMC method has high and stable computational precision and low computation cost because of the constant and limited number of fictitious particles. Lastly the source of numerical error and the relative error of MMC method are analyzed, respectively.

关键词： multi-Monte Carlo method, general dynamic equation, coagulation, deposition, particle size distribution, dispersed systems.

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Techno-economic evaluation of oxy-combustion coal-fired power plants

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Chinese Science Bulletin 2011年第31期56卷 3333-3345页

作者： XIONG Jie ZHAO haibo zheng ChuGuang State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Wuhan 430074 China

Increasing attention is being paid to the oxycombustion technique of coal-fired power plants because CO 2 produced from fossil fuel combustion can be captured and sequestrated by it. However, there are many questions about the economic properties of the oxy-combustion technique. In this paper, a detailed techno-economic evaluation study was performed on three typical power plants (2 × 300 MW subcritical, 2 × 600 MW supercritical, 2 × 1000 MW ultra supercritical), as conventional air fired and oxycombustion options in China, by utilizing the authoritative data published in 2010 for the design of coal-fired power plants. Techno-economic evaluation models were set up and costs of electricity generation, CO 2 avoidance costs as well as CO 2 capture costs, were calculated. Moreover, the effects of CO 2 tax and CO 2 sale price on the economic characteristics of oxycombustion power plants were also considered. Finally, a sensitivity analysis for parameters such as coal sample, coal price, air separation unit price, flue gas treatment unit price, CO 2 capture efficiency, as well as the air excess factor was conducted. The results revealed that: (1) because the oxy-combustion technique has advantages in thermal efficiency, desulfurization efficiency and denitration efficiency, oxy-combustion power plants will reach the economic properties of conventional air fired power plants if, (a) the CO 2 emission is taxed and the high purity CO 2 product can be sold, or (b) there are some policy preferences in financing and coal price for oxy-combustion power plants, or (c) the power consumption and cost of air separation units and flue gas treatment units can be reduced; (2) from subcritical plants to supercritical and finally ultra-supercritical plants, the economics are improving, regardless of whether they are conventional air fired power plants or oxy-combustion power plants.

关键词：技术经济评价富氧燃烧燃煤电厂空气分离装置二氧化碳税二氧化碳排放量氧燃烧技术发电成本

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Flow-restricted Etching Method on Isotropic Substrates and Its Mechanism

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Chinese Journal of Mechanical Engineering 2010年第5期23卷 560-567页

作者： XIE haibo zheng Yi FAN Yurun FU Xin YANG Huayong The State Key Lab of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

With the development of analytical instrumentation to minimization,integration and automation,the microfluidic chips,which are more integrated,complex and diversified,have been applied widely on the manufacturing of analytical ***,the present photolithography-based microfabrication technology,which is only able to pattern microchannels with simple inside structures,can not follow the rapid development of *** solving the problem,a fabrication method based on the restricting effect of laminar flow is proposed for the micro etching on isotropic *** were conducted inside glass-based microchannels,in which certain etchant was used to form complicated *** flow parameters＇ effects on the aspect ratio,side wall profile and etching rate were revealed by the *** experimental results reveal that the topography of micro structures patterned with the restricted flow etching method is mainly determined by the flowrates of separator and *** computational fluid dynamics（CFD） model on the interface between multiple streams was established for the etching process,and analysis on the causes of various micro topographies was conducted based on the CFD simulation *** experimental data consisted with the simulation results very *** investigation depicted in this paper indicate that the flow restricted etching method provides sufficient references for the research and understanding on the mass transport at the liquid-liquid surface in the microchannel and can be used to pattern complex micro structures with high aspect ratios,meantime,it greatly enriches the microfabrication technology for microfluidic chips.

关键词： microfluidics etching computational fluid dynamics(CFD) laminar

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Automatic detection of sow estrus using a lightweight real-time detector and thermal images

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International Journal of Agricultural and Biological Engineering 2023年第3期16卷 194-207页

作者： haibo zheng Hang Zhang Shuang Song Yue Wang Tonghai Liu College of Computer and Information Engineering Tianjin Agricultural UniversityTianjin 300392China

Determination of ovulation time is one of the most important tasks in sow reproduction *** variation in the vulva of the sows can be used as a predictor of ovulation ***,the skin temperatures of sows in existing studies are obtained manually from infrared thermal images,posing an obstacle to the automatic prediction of ovulation *** this study,an improved YOLO-V5s detector based on feature fusion and dilated convolution(FDYOLOV5s)was proposed for the automatic extraction of the vulva temperature of sows based on infrared thermal *** the purpose of reducing the model complexity,the depthwise separable convolution and the modified lightweight ShuffleNet-V2 module were introduced in the ***,the feature fusion network structure of the model was simplified for efficiency,and a mixed dilated convolutional module was designed to obtain global *** experimental results show that FD-YOLOV5s outperformed the other nine methods,with a mean average precision(mAP)of 99.1%,an average frame rate of 156.25 fps,and a model size of only 3.86 MB,indicating that the method effectively simplifies the model while ensuring detection *** a linear regression between manual extraction and the results extracted using this method in randomly selected thermal images,the coefficients of determination for maximum and average vulvar temperatures reached 99.5%and 99.3%,*** continuous vulva temperature of sows was obtained by the target detection algorithm,and the sow estrus detection was performed by the temperature trend and compared with the manually detected estrus *** results showed that the sensitivity,specificity,and error rate of the estrus detection algorithm were 89.3%,94.5%,and 5.8%,*** method achieves real-time and accurate extraction of sow vulva temperature and can be used for the automatic detection of sow estrus,which could be helpful for the automatic prediction of ovulation ti

关键词： automatic estrus detection thermal images real-time detector vulva temperature mixed dilated convolutional

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A portable wind turbine condition monitoring system and its field applications

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Clean Energy 2018年第1期2卷 58-71页

作者： Jingbo Zhao Wenxing Deng Zonglin Yin haibo zheng Ting Hu Weilin Yu Huageng Luo Guohua Energy Investment Co. Ltd.China Energy Investment Corporation Ltd.Cangzhou 061100China National Institute of Clean-and-Low-Carbon Energy Future Science ParkChangping DistrictBeijing 102211China

This article introduces a portable wind turbine condition monitoring system(CMS)and its applications in wind turbine drivetrain damage *** portable CMS based on vibration detection and analysis has a long application history in conventional rotating machineries,but it is not widely used in wind *** are several reasons why it is not used,including the labor-and knowledge-intensive requirements for test setup and result *** are also reasons specific to wind turbines,such as the structural diversity of drivetrains,the uncertainty of operational conditions,and the complexity of the damage mechanism of different parts that make the conventional vibration-based CMS inefficient and not *** these factors affect the wide application of the portable *** portable wind turbine CMS discussed in this article is integrated using advanced vibration measurement and analysis *** detection for the acquired acceleration response and high-speed shaft speed signal is carried out by a suite of data analysis techniques specifically designed for a wind turbine *** these techniques,damage detection accuracy for all the components inside a gearbox is improved significantly,especially for those related to medium-and low-speed *** new data processing techniques also are briefly described with the developed methodologies verified by three wind turbines with typical low-speed shaft-related component *** damage assessments include the low-and medium-speed planetary stage ring gear,the low-speed planetary stage planet gear and damage to the main bearing.

关键词： wind power generation drivetrain portable detector vibration analysis fault detection condition monitoring system(CMS) wind field test case

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基于数字孪生的电力设备实时巡检监控方法研究

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电子设计工程 2025年第1期33卷 137-141页

作者：胡周达钟漍标王凯刘嘉郑海波广东省能源集团贵州有限公司贵州贵阳550081

为进一步增强对新能源发电站的安全巡检能力,保障新能源发电站的安全稳定运转,提出了一种基于数字孪生的电力设备实时巡检监控方法。该方法在数字孪生技术的基础上对电力设备安全巡检系统进行了建模和仿真,使用5G网络切片技术确保电力... 详细信息

为进一步增强对新能源发电站的安全巡检能力,保障新能源发电站的安全稳定运转,提出了一种基于数字孪生的电力设备实时巡检监控方法。该方法在数字孪生技术的基础上对电力设备安全巡检系统进行了建模和仿真,使用5G网络切片技术确保电力设备数据在巡检系统中的传输速度。同时,还设计了一种轻量级残差密集卷积神经网络,并将其与能谱图结合,实现了对电力设备故障的快速、精准识别。实验结果表明,所提出的实时巡检监控技术方案具有良好的综合性能,识别准确率可达98.32%,相比于仿真性能最优的SENet仍高出5.11%,从采集数据到回传识别结果所需的时间仅为2.1~3.3 s。

关键词：数字孪生电力设备巡检 5G网络切片深度学习

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Pollutant Sources and Foaming Control Measures of Decarbonization Solution in Natural Gas Purification Plant

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Journal of Architectural Research and Development 2021年第2期5卷 62-65页

作者： haibo zheng Schlumberger Copower Oilfield Engineering Co. Ltd.Yan’an 716002Shaanxi ProvinceChina

Yanbei project of Schlumberger Copower Oilfield Engineering Co.,Ltd.-natural gas purification plant decarbonization unit is equipped with two sets of decarbonization systems(parallel operation).The two sets of systems adopt two tower process,full lean liquid circulation regeneration process,one tower absorption(absorption pressure 5.4mpag),one tower regeneration(regeneration temperature 95℃-110℃),purified natural gas carbon dioxide content≤2.5vol%,single set The treatment capacity is 2300 KM3/*** paper introduces the problems existing in the decarbonization solution of the decarbonization unit in the natural gas purification plant in recent three years,analyzes the causes of pollutants affecting the quality of the decarbonization solution,and probes into the control measures for the pollution of the decarbonization solution,so as to provide reference.

关键词： Natural gas purification plant Decarbonization solution Foaming reason Control measures

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Turbulent boundary layer control with a spanwise array of DBD plasma actuators

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Plasma Science and Technology 2021年第2期23卷 30-37页

作者： Yueqiang LI Chao GAO Bin WU Yushuai WANG haibo zheng Ming XUE Yuling WANG School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072People's Republic of China

The turbulent boundary layer control on NACA 0012 airfoil with Mach number ranging from 0.3 to 0.5 by a spanwise array of dielectric barrier discharge(DBD)plasma actuators by hot-film sensor technology is *** to temperature change mainly caused through heat produced along with plasma will lead to measurement error of shear stress measured by hot-film sensor,the correction method that takes account of the change measured by another sensor is used and works *** order to achieve the value of shear stress change,we combine computational fluid dynamics computation with experiment to calibrate the hot-film *** test the stability of the hot-film sensor,seven repeated measurements of shear stress at Ma=0.3 are conducted and show that confidence interval of hot-film sensor measurement is from−0.18 to 0.18 Pa and the root mean square is 0.11 Pa giving a relative error 0.5%over all Mach numbers in this *** research on the turbulent boundary layer control with DBD plasma actuators demonstrates that the control makes shear stress increase by about 6%over the three Mach numbers,which is thought to be reliable through comparing it with the relative error 0.5%,and the value is hardly affected by burst frequency and excitation voltage.

关键词： turbulent boundary layer control DBD plasma actuators hot-film sensor

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