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Evolution and control of inclusions of Ti-bearing ultra-low carbon steel during the steelmaking process

Progress in Natural Science:Materials International 2024年第3期34卷 585-590页

作者： Wenjun Ma Bin Chen Haibo Li Lixia Hao Jianguan Chen Yi Jia daozheng liu Shougang Research Institute of Technology Room 1107No.69Yangzhuang RoadShijingshan DistrictBeijing100043China Beijing Shougang co. ltdRoom 606Yang DianZi Town Riverside VillageQian'an064404China

This article investigates the evolution and control of inclusions in the smelting process of titanium containing ultra-low carbon *** industrial experiments,the influence of oxygen content before aluminum addition on inclusions in ultra-low carbon IF steel was explored,and the evolution process of inclusions was *** microstructure of different types of inclusions was observed using three-dimensional analysis *** has found that the oxygen content before aluminum addition has no significant effect on the final oxygen ***,under low aluminum and low oxygen conditions,the size of inclusions formed is small and difficult to float and *** if the cycle time is extended,the AF index of inclusions remains at a high *** three-dimensional morphology analysis of inclusions,it was found that alumina formed under high aluminum and high oxygen conditions is very dense,while inclusions are relatively loose under low aluminum and low oxygen *** addition,through the analysis of aluminum oxygen supersaturation before the formation of aluminum oxide inclusions,it was found that due to the low oxygen content,the nucleation rate of aluminum oxide in the early stage of inclusion formation is relatively low,and the inclusions grow along the trajectory of oxygen,ultimately forming polycrystalline aluminum oxide *** article also observed for the first time the initial three-dimensional morphology of Al Ti inclusions,providing a theoretical basis for further optimizing smelting processes and controlling inclusions.

关键词： Inclusions Ultra-low carbon steel Steelmaking process Morphology of Al_(2)O_(3) TiO_(x)complex oxide Al_(2)O_(3)cluster

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铁水预脱磷温度对脱磷渣结构及行为的分析与探讨

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钢铁 2024年第8期59卷 27-39页

作者：周朝刚陈庆功闫占辉赵长亮刘道正王连全单庆林王书桓华北理工大学冶金与能源学院首钢京唐钢铁联合有限责任公司轧钢作业部首钢京唐钢铁联合有限责任公司炼钢部首钢股份公司迁安钢铁公司天津铁厂有限公司炼钢厂唐山钢铁集团有限责任公司技术中心

为探究不同铁水温度下脱磷熔渣结构演变对脱磷效果及磷迁移富集行为的影响，在铁水温度为1 340～1 420℃条件下进行了实验室试验，利用XRD、SEM-EDS、FTIR和Raman光谱对试验后脱磷终渣的结构进行了表征。热力学理论分析表明，随着温度... 详细信息

为探究不同铁水温度下脱磷熔渣结构演变对脱磷效果及磷迁移富集行为的影响，在铁水温度为1 340～1 420℃条件下进行了实验室试验，利用XRD、SEM-EDS、FTIR和Raman光谱对试验后脱磷终渣的结构进行了表征。热力学理论分析表明，随着温度的升高，磷的分配比逐渐降低。铁水脱磷试验表明，当铁水温度为1 380℃时，铁水脱磷效率最高，温度过高或过低均不利于脱磷，且铁水硅质量分数随着温度的升高逐渐降低。XRD和SEM-EDS分析结果表明，磷主要富集在2CaO·SiO2结晶区，富磷相由2CaO·SiO2-3CaO·P2O5固溶体组成，温度的升高会降低富磷相的比例。拉曼和红外分析结果表明，Si—O—Si键受温度升高的影响较小。当温度较低时，炉渣中Q1（Si）、Q2（Si）和Q3（Si）的含量增加。当温度升至1 380℃时，Si—O—Si键断裂，Q0（Si）增大。低聚合度的硅酸盐结构促进磷的迁移和聚集，以Q1（P）形式存在的磷逐渐增加。当温度为1 380～1 420℃时，较高的铁水温度抑制了磷的迁移，进入渣中的硅往往以高聚合度的形式存在，随着脱硅反应的进行，渣的聚合度逐渐增加。此外，由于FeO6八面体的显著增加和硅酸盐聚合度的提高，磷向硅氧网络结构中的迁移受到抑制，以Q0（P）形式存在的磷逐渐增加，磷在炉渣中的扩散程度增加。可以为钢铁企业解决铁水磷质量分数超标问题和控制合理的预脱磷温度提供理论指导和参考。

关键词：预脱磷铁水温度氧化铁皮红外光谱拉曼光谱熔渣结构

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KR铁水预处理脱硫的动力学模型

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水钢科技 2024年第2期 54-63页

作者：白神哲夫王智成(译) 刘道正(译) 叶雅妮(译) 吴学林(译) 张东升(译) JFE钢铁公司仙台制造所首钢水钢技术中心贵州六盘水553028

本报告中的非调质钢主要集中在中低碳钢,并总结了它们的发展趋势。此外,在过去的“西山纪念技术讲座”中,也提到非调质钢。目前对非调质钢的整体需求包括:(1)低成本;(2)轻量化;(3)环保性;(4)高性能。其中,从降低材料成本和全球环境保护... 详细信息

本报告中的非调质钢主要集中在中低碳钢,并总结了它们的发展趋势。此外,在过去的“西山纪念技术讲座”中,也提到非调质钢。目前对非调质钢的整体需求包括:(1)低成本;(2)轻量化;(3)环保性;(4)高性能。其中,从降低材料成本和全球环境保护的角度来看,对环保材料的需求更为急迫。就轧制工艺而言,非调质钢省略部分工艺,可降低成本。使用特性则通过提高强度和降低重量,降低重量则会影响燃料消耗,进而影响环保性能。非调质钢的高性能也是提高可靠性的持续需求。钢材制造商在生产非调质钢时是有目的性的,是为了解决一些特殊问题而生产,但同时也充分考虑客户现场的热加工性、冷加工性、切削加工性、热处理性(淬火、渗碳、渗氮、感应淬火)等轧制特性,确保产品在使用时不仅具有强度,还具有抗性、疲劳性、崩裂和断裂性能,与上述需求(低成本、轻量化、环保性、高性能)交织在一起。本文概述了非调质钢的发展现状,以及对今后的发展进行了展望。

关键词：非调质钢热锻性切削性强度韧性

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首钢水钢含钒钛铁水KR脱硫预处理实践

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水钢科技 2024年第1期 12-16页

作者：朱贤益刘道正蒙世东蓝桂年刘明波杨龙飞文安义洪军首钢水钢技术中心首钢钢轧事业部贵州六盘水553028

KR铁水脱硫工艺由于其优秀的搅拌脱硫效果使其得到不断地推广应用.首钢水钢建立两座KR脱硫站进行含钒钛铁水脱硫预处理,铁水脱硫站设备设计处理产能为316.8万t/年.为了探索高效脱硫的工艺过程,制定低成本运行工艺制度.在分析KR脱硫过程... 详细信息

KR铁水脱硫工艺由于其优秀的搅拌脱硫效果使其得到不断地推广应用.首钢水钢建立两座KR脱硫站进行含钒钛铁水脱硫预处理,铁水脱硫站设备设计处理产能为316.8万t/年.为了探索高效脱硫的工艺过程,制定低成本运行工艺制度.在分析KR脱硫过程机理的基础上,结合对钒钛铁水性质、脱硫剂粒度及成分、搅拌转速、搅拌时间等分析影响脱硫的主要因素,有针对性地提出设计方案和控制措施,为低成本KR脱硫生产提供指导和借鉴.

关键词：含钒钛铁水 KR脱硫预处理因素分析过程优化

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Frequency Regulation of VSC-MTDC System with Offshore Wind Farms

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 275-286页

作者： Haoyu liu Chongru liu North China Electric Power University Beijing 102206China

Frequency regulation of voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC)system with offshore wind farms enhances the frequency stability by compensating the power for a disturbed AC ***,it is difficult to reasonably allocate frequency-regulation resources due to a lack of coordination mechanisms between wind farms and the MTDC ***,it is difficult for the frequency control of the wind farms to manage changes in wind speed;and the risk of wind-turbine stalls is ***,based on the kinetic energy of wind turbines and the power margin of the converters,the frequency-regulation capability of wind turbines is evaluated,and a dynamic frequency-support scheme considering the real-time frequency-support capability of the wind turbines and system frequency evolution is proposed to improve the frequency-support performance.A power adaptation technique at variable wind speeds is developed;the active power in the frequency-support stage and restoration stage is switched according to the wind speed.A hierarchical zoning frequency-regulation scheme is designed to use the frequency-regulation resources of different links in the MTDC system with wind *** simulation results show that the novel frequency-regulation strategy maintains frequency stability with wind-speed changes and avoids multiple frequency dips.

关键词： Wind generation voltage source converter-based multi-terminal high-voltage direct current(VSC-MTDC) frequency regulation cooperative control adaptive control variable wind speed

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A Novel Design of a Pre-separation Panel Structure to Protect Against the Impact of an Explosion in an Aircraft Plenum Chamber

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Acta Mechanica Solida Sinica 2024年第1期37卷 166-180页

作者： Zongxing liu Xiang Yang Jun liu School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China COMAC Shanghai Aircraft Design and Research Institute Shanghai 201210China

To reduce the damage of the pressurizing panel structure of a fuselage caused by an explosion at the“least risk bomb location”in an aircraft structure,a new pre-separation panel structure was designed to resist blast ***,the dynamic strain response and morphology of impact damage of the new pre-separation panel were measured in an impact damage ***,the commercial software LS-DYNA was used to calculate the propagation of the blast shock wave,and the results were compared with empirical equations to verify the rationality of the numerical calculation ***,the fluid–structure coupling method was used to calculate the damage process of the pre-separation panel structure under the impact of an explosion wave and an impact *** calculated results were in good agreement with the test results,which showed the rationality of the calculation method and the *** residual strength of the damaged pre-separation panel was significantly higher than that of the original damaged *** results show that the new pre-separation panel structure is reasonable and has certain significance for guiding the design of plenum chambers with strong resistance to implosion for aircraft fuselages.

关键词： Pre-separation panel structure Explosive response Residual strength Aircraft plenum chamber Least risk bomb location

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Effectiveness and safety of acupuncture in treatment of pregnancyrelated symptoms:a systematic review and Meta-analysis

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Journal of Traditional Chinese Medicine 2024年第1期44卷 16-26页

作者： liu Tingting liu Tongou liu Mingfu School of Traditional Chinese Medicine Clinical Medicine Hubei University of Traditional Chinese MedicineWuhan 430000China First Clinical College of Hubei University of Traditional Chinese Medicine Wuhan 430000China Department of Acupuncture and Tuina Affiliated Hospital of Hubei University of Traditional Chinese MedicineHubei Provincial Hospital of Traditional Chinese MedicineWuhan 430000China

OBJECTIVE:To systematically evaluate the efficacy and safety of acupuncture(AM)in the treatment of pregnancyrelated symptoms such as acute vomiting during ***:We comprehensively searched the available literature up to November 2021,including Pub Med,Embase,Cochrane Library,Chinese Biomedical Literature Database,and China National Knowledge Infrastructure Database,for randomized controlled trials(RCTs)on AM for the treatment of severe vomiting,insomnia,pharyngeal and pelvic pain,mood abnormalities,and dyspepsia during ***:Sixteen RCTs with a cumulative sample size of 1178 cases were *** these,964 patients were included in the *** Meta-analysis results showed that AM was more efficient than Western medicine in treating discomfort during pregnancy[odds ratio(OR)=1.19,95%confidence interval(CI)(1.11,1.28),P<0.01].AM was better than the control group in improving the visual analog scale scores[standard mean difference(SMD)=0.62,95%CI(0.53,0.71),P<0.01].AM was superior to the control group in improving Numerical Rating Scale(NRS)symptom scores[OR=7.31,95%CI(3.36,15.94),P<0.01].There was no significant difference in adverse effects between the AM and sham-AM groups and the analgesic drug group[OR=0.70,95%CI(0.39,1.28),P=0.25],but the treatment and control groups had mild adverse effects with a low ***:AM is more effective than other treatments or pharmacotherapy alone in the treatment of pregnancy-related symptoms,and is relatively ***,the quality of the included trials was rather poor,and high-quality studies are required to confirm our findings.

关键词： acupuncture pregnancy nausea vomiting sleep initiation and maintenance disorders low back pain pelvic pain mood abnormalities Meta-analysis systematic review

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Stochastic Unit Commitment with High-Penetration Offshore Wind Power Generation in Typhoon Scenarios

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 535-546页

作者： Yanqi liu Dundun liu Hongcai Zhang State Key Laboratory of Internet of Things for Smart City and Department of Electrical and Computer Engineering University of MacaoMacao 999078China University of Macao Zhuhai UM Science and Technology Research Institute ZhuhaiChina

To tackle the energy crisis and climate change,wind farms are being heavily invested in across the *** China's coastal areas,there are abundant wind resources and numerous offshore wind farms are being *** secure operation of these wind farms may suffer from typhoons,and researchers have studied power system operation and resilience enhancement in typhoon ***,the intricate movement of a typhoon makes it challenging to evaluate its spatial-temporal *** published papers only consider predefined typhoon trajectories neglecting *** address this challenge,this study proposes a stochastic unit commitment model that incorporates high-penetration offshore wind power generation in typhoon *** adopts a data-driven method to describe the uncertainties of typhoon trajectories and considers the realistic anti-typhoon mode in offshore wind farms.A two-stage stochastic unit commitment model is designed to enhance power system resilience in typhoon *** formulate the model into a mixed-integer linear programming problem and then solve it based on the computationally-efficient progressive hedging algorithm(PHA).Finally,numerical experiments validate the effectiveness of the proposed method.

关键词： Unit commitment two-stage stochastic programming offshore wind farm typhoon

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广蜡蝉科三个代表种的线粒体基因组结构比较及其系统发育含义(半翅目:蜡蝉总科)

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Entomotaxonomia 2024年第1期46卷 14-26页

作者：张欢秦道正西北农林科技大学植物保护学院陕西杨凌712100

对广蜡蝉科内的类广蜡蝉属、曲广蜡蝉属和疏广蜡蝉属各1个代表种的线粒体基因组进行了测序和组装,发现琼边类广蜡蝉,福建曲广蜡蝉和透明疏广蜡蝉的完整线粒体基因组长度分别为15,906,15,809和16,127bp,整个线粒体基因组呈正AT偏斜和负G... 详细信息

对广蜡蝉科内的类广蜡蝉属、曲广蜡蝉属和疏广蜡蝉属各1个代表种的线粒体基因组进行了测序和组装,发现琼边类广蜡蝉,福建曲广蜡蝉和透明疏广蜡蝉的完整线粒体基因组长度分别为15,906,15,809和16,127bp,整个线粒体基因组呈正AT偏斜和负GC偏斜,r RNAs基因的A+T含量略高于t RNAs;所有蛋白编码基因(PCGs)均以起始密码ATN开头,以TAA、TAG或1个不完整的终止密码子单T结尾。划窗分析、Ka/Ks和遗传距离分析均表明,与其他PCGs相比,基因cox1进化最慢且相对保守,可以用于广蜡蝉科高级阶元系统发育关系探讨。本文还基于现有线粒体基因组数据分析了该科5属11种的系统发育关系。

关键词：头喙亚目分类系统发育

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Revealing the role of electrode potential micro-environments in single Mn atoms for carbon dioxide and oxygen electrolysis

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Nano Research 2024年第9期17卷 7957-7966页

作者： Pengcheng liu anyi liu Kaili Wang Shuai Shi Mengmeng Jin Jingxiu liu Tao Qin Qian liu Xijun liu Jia He Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringInstitute of New-Energy Materials and Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China School of Chemistry and Chemical Engineering and Environmental Engineering Weifang UniversityWeifang 261061China Department of Electrical Engineering and Automation Luoyang Institute of Science and TechnologyLuoyang 471023China Institute for Advanced Study Chengdu UniversityChengdu 610106China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China

Elucidation the relationship between electrode potentials and heterogeneous electrocatalytic reactions has attracted widespread *** we construct the well-defined Mn single-atom(MnSA)catalyst with four N-coordination through a simple thermal pyrolysis preparation method to investigate the electrode potential micro-environments effect on carbon dioxide reduction reactions(CO_(2)RR)and oxygen reduction reactions(ORR).MnSA catalysts generate higher CO production Faradaic efficiency of exceeding 90%at-0.9 V for CO_(2)RR and higher H_(2)O_(2)yield from 0.1 to 0.6 V with excellent ORR *** functional theory(DFT)calculations based on constant potential models were performed to study the mechanism of MnSA on CO_(2)*** thermodynamic energy barrier of CO_(2)RR is lowest at-0.9 V *** hydrogen electrode(RHE).Similar DFT calculations on the H_(2)O_(2)yield of ORR showed that the H_(2)O_(2)yield at 0.2 V was *** study provides a reasonable explanation for the role of electrode potential micro-environments.

关键词： electrode potential micro-environments Mn single-atom catalyst carbon dioxide reduction reaction oxygen reduction reaction constant potential models

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