Article(id=1319293326579319636, tenantId=1146029695717560320, journalId=1316781260334530699, issueId=1319293303430955712, articleNumber=null, orderNo=null, doi=10.3969/j.issn.1005-0329.2025.08.005, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1741017600000, receivedDateStr=2025-03-04, revisedDate=1748793600000, revisedDateStr=2025-06-02, acceptedDate=null, acceptedDateStr=null, onlineDate=1792473640341, onlineDateStr=2026-10-20, pubDate=1756483200000, pubDateStr=2025-08-30, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792473640341, onlineIssueDateStr=2026-10-20, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792473640341, creator=13701087609, updateTime=1792473640341, updator=13701087609, issue=Issue{id=1319293303430955712, tenantId=1146029695717560320, journalId=1316781260334530699, year='2025', volume='53', issue='8', pageStart='1', pageEnd='118', issueExtLink='null', onlineDate='null', pubDate='1756483200000', pubDateStr='2025-08-30', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792473634822, creator='13701087609', updateTime=1792473634822, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=36, endPage=43, ext={EN=ArticleExt(id=1319293326751286101, articleId=1319293326579319636, tenantId=1146029695717560320, journalId=1316781260334530699, language=EN, title=Study on erosion performance of electric ball valves for heavy medium suspension in coal preparation plants, columnId=null, journalTitle=Fluid Machinery, columnName=null, runingTitle=null, highlight=null, articleAbstract=

To address the erosion wear issue of electric ball valves used in heavy medium suspension transportation systems of coal preparation plants,a combined approach of numerical simulation and experimental study was adopted to investigate the formation mechanism of the erosion process.The erosion rate,erosion area,and damage distribution patterns of electric ball valves under different inlet flow velocities,particle sizes,and valve openings were analyzed.The results show that compared to particle size and valve opening,the inlet flow velocity has a more significant impact on the erosion wear of electric ball valves and is the dominant factor affecting the erosion rate.When the inlet flow velocity increases from 0.8 m/s to 1.5 m/s,the maximum erosion rate increases from 1.76×10-4 kg/(m2∙s) to 1.958×10-3 kg/(m2∙s),while the erosion area on the sphere surface expands significantly.The formation of erosion pits mainly stems from microcrack propagation and material spallation caused by high‑speed particle impact,with large‑sized particles capable of forming erosion pits 20~50 μm in diameter.By controlling the inlet flow velocity to no more than 1.0 m/s,restricting heavy medium particle size below 45 μm,and adjusting the valve opening to the optimized range of 60%~80%,the degree of spherical erosion damage can be significantly reduced,thereby effectively extending the service life of electric ball valves.This study not only provides an optimization solution for the stable operation of heavy medium suspension transportation systems but also lays a theoretical foundation for achieving precise flow control.

, authors=Xuke ZHANG1, Mengmeng MA1, Jianbin WANG2, Kaixiong WANG2, Zhangguo WANG3, Haisheng LI3, authorsList=Xuke ZHANG, Mengmeng MA, Jianbin WANG, Kaixiong WANG, Zhangguo WANG, Haisheng LI, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1319293328470950758, articleId=1319293326579319636, tenantId=1146029695717560320, journalId=1316781260334530699, language=CN, title=选煤厂重介悬浮液用电动球阀的冲蚀性能研究, columnId=1317484287230853622, journalTitle=流体机械, columnName=设计计算, runingTitle=null, highlight=null, articleAbstract=

针对选煤厂重介悬浮液输送系统用电动球阀的冲蚀磨损问题,采用数值模拟与试验研究相结合的方法,研究了冲蚀过程形成机理,分析了不同入口流速、颗粒粒径和阀门开度等条件下电动球阀冲蚀速率、冲蚀面积及损伤分布规律。结果表明:与颗粒粒径和阀门开度相比,入口流速对电动球阀冲蚀磨损的影响更加显著,是影响冲蚀速率的主导因素,当入口流速从0.8 m/s提升到1.5 m/s时,最大冲蚀速率从1.76×10-4 kg/(m2∙s)增加到1.958×10-3 kg/(m2∙s),同时球体表面的冲蚀面积明显扩大,冲蚀坑的形成主要源于颗粒高速冲击引发的微裂纹扩展和材料剥落过程,其中,大尺寸颗粒冲击可形成直径20~50 μm的冲蚀坑。通过控制入口流速不超过1.0 m/s、限制重介质颗粒粒径在45 μm以下、并将阀门开度调节至60%~80%的优化区间,可显著降低球体冲蚀损伤程度,从而有效延长电动球阀的使用寿命。本研究不仅为重介悬浮液输送系统的稳定运行提供了优化方案,同时为实现流量的精准调控奠定了理论基础。

, authors=张旭可1, 马猛猛1, 王建斌2, 王凯雄2, 王章国3, 李海生3, authorsList=张旭可, 马猛猛, 王建斌, 王凯雄, 王章国, 李海生, authorCompany=null, correspAuthors=null, authorNote=

张旭可(1982),男,高级工程师,主要从事选煤厂智能化的技术研究与工程实施工作,通信地址:300131天津市红桥区三条石街道大胡同4号中选智控(天津)科技有限公司,E-mail:。

, correspAuthorsNote=null, copyrightStatement=作者向本刊所投稿件一经本刊录用,则该论文的复制权、发行权、信息网络传播权、翻译权、汇编权等权利视为自动转让给本刊。本刊为国内各主要数据库收录期刊,本刊所发表的稿件将同时通过互联网进行网络出版或提供信息服务。, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=Ct18lTXkWLebExOqEaofUw==, magXml=XtLJvKuEHwP4Jl6AAcnrZA==, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=LDraJ4j4b3Dbvwxg9rM0GQ==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=H9L3YwM8PclfU3pVfw9etA==, mapNumber=null, fund=null)}, authors=[Author(id=1319293330513576817, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293326579319636, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=444648003@qq.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1319293330677154675, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293326579319636, authorId=1319293330513576817, language=EN, stringName=Xuke ZHANG, firstName=Xuke, middleName=null, lastName=ZHANG, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=1, address=1Zhongxuan Intelligent Control (Tianjin) Technology Co.,Ltd.,Tianjin 300131,China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1319293330807178100, tenantId=1146029695717560320, journalId=1316781260334530699, articleId=1319293326579319636, authorId=1319293330513576817, language=CN, stringName=张旭可, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=1, address=1中选智控(天津)科技有限公司,天津 300131, bio={"content":"

张旭可(1982),男,高级工程师,主要从事选煤厂智能化的技术研究与工程实施工作,通信地址:300131天津市红桥区三条石街道大胡同4号中选智控(天津)科技有限公司,E-mail:。

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张旭可(1982),男,高级工程师,主要从事选煤厂智能化的技术研究与工程实施工作,通信地址:300131天津市红桥区三条石街道大胡同4号中选智控(天津)科技有限公司,E-mail:。

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选煤厂重介悬浮液用电动球阀的冲蚀性能研究
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张旭可 1 , 马猛猛 1 , 王建斌 2 , 王凯雄 2 , 王章国 3 , 李海生 3
流体机械 | 设计计算 2025,53(8): 36-43
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流体机械 |设计计算 2025 , 53 (8) : 36 -43
选煤厂重介悬浮液用电动球阀的冲蚀性能研究
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张旭可(1982),男,高级工程师,主要从事选煤厂智能化的技术研究与工程实施工作,通信地址:300131天津市红桥区三条石街道大胡同4号中选智控(天津)科技有限公司,E-mail:。

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张旭可(1982),男,高级工程师,主要从事选煤厂智能化的技术研究与工程实施工作,通信地址:300131天津市红桥区三条石街道大胡同4号中选智控(天津)科技有限公司,E-mail:。

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张旭可1 , 马猛猛1, 王建斌2, 王凯雄2, 王章国3, 李海生3
作者信息
  • 1中选智控(天津)科技有限公司,天津 300131
  • 2国能准能集团选煤厂,内蒙古 鄂尔多斯 010300
  • 3中国矿业大学 化工学院,江苏 徐州 221116
作者简介:

张旭可(1982),男,高级工程师,主要从事选煤厂智能化的技术研究与工程实施工作,通信地址:300131天津市红桥区三条石街道大胡同4号中选智控(天津)科技有限公司,E-mail:。

Study on erosion performance of electric ball valves for heavy medium suspension in coal preparation plants
Xuke ZHANG1 , Mengmeng MA1, Jianbin WANG2, Kaixiong WANG2, Zhangguo WANG3, Haisheng LI3
Affiliations
  • 1Zhongxuan Intelligent Control (Tianjin) Technology Co.,Ltd.,Tianjin 300131,China
  • 2Guoneng Zhunneng Group Coal Processing Plant,Ordos 010300,China
  • 3School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China
出版时间: 2025-08-30 doi: 10.3969/j.issn.1005-0329.2025.08.005
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针对选煤厂重介悬浮液输送系统用电动球阀的冲蚀磨损问题,采用数值模拟与试验研究相结合的方法,研究了冲蚀过程形成机理,分析了不同入口流速、颗粒粒径和阀门开度等条件下电动球阀冲蚀速率、冲蚀面积及损伤分布规律。结果表明:与颗粒粒径和阀门开度相比,入口流速对电动球阀冲蚀磨损的影响更加显著,是影响冲蚀速率的主导因素,当入口流速从0.8 m/s提升到1.5 m/s时,最大冲蚀速率从1.76×10-4 kg/(m2∙s)增加到1.958×10-3 kg/(m2∙s),同时球体表面的冲蚀面积明显扩大,冲蚀坑的形成主要源于颗粒高速冲击引发的微裂纹扩展和材料剥落过程,其中,大尺寸颗粒冲击可形成直径20~50 μm的冲蚀坑。通过控制入口流速不超过1.0 m/s、限制重介质颗粒粒径在45 μm以下、并将阀门开度调节至60%~80%的优化区间,可显著降低球体冲蚀损伤程度,从而有效延长电动球阀的使用寿命。本研究不仅为重介悬浮液输送系统的稳定运行提供了优化方案,同时为实现流量的精准调控奠定了理论基础。

电动球阀  /  冲蚀性能  /  选煤厂  /  重介悬浮液

To address the erosion wear issue of electric ball valves used in heavy medium suspension transportation systems of coal preparation plants,a combined approach of numerical simulation and experimental study was adopted to investigate the formation mechanism of the erosion process.The erosion rate,erosion area,and damage distribution patterns of electric ball valves under different inlet flow velocities,particle sizes,and valve openings were analyzed.The results show that compared to particle size and valve opening,the inlet flow velocity has a more significant impact on the erosion wear of electric ball valves and is the dominant factor affecting the erosion rate.When the inlet flow velocity increases from 0.8 m/s to 1.5 m/s,the maximum erosion rate increases from 1.76×10-4 kg/(m2∙s) to 1.958×10-3 kg/(m2∙s),while the erosion area on the sphere surface expands significantly.The formation of erosion pits mainly stems from microcrack propagation and material spallation caused by high‑speed particle impact,with large‑sized particles capable of forming erosion pits 20~50 μm in diameter.By controlling the inlet flow velocity to no more than 1.0 m/s,restricting heavy medium particle size below 45 μm,and adjusting the valve opening to the optimized range of 60%~80%,the degree of spherical erosion damage can be significantly reduced,thereby effectively extending the service life of electric ball valves.This study not only provides an optimization solution for the stable operation of heavy medium suspension transportation systems but also lays a theoretical foundation for achieving precise flow control.

electric ball valve  /  erosion performance  /  coal preparation plant  /  heavy medium suspension
张旭可, 马猛猛, 王建斌, 王凯雄, 王章国, 李海生. 选煤厂重介悬浮液用电动球阀的冲蚀性能研究. 流体机械, 2025 , 53 (8) : 36 -43 . DOI: 10.3969/j.issn.1005-0329.2025.08.005
Xuke ZHANG, Mengmeng MA, Jianbin WANG, Kaixiong WANG, Zhangguo WANG, Haisheng LI. Study on erosion performance of electric ball valves for heavy medium suspension in coal preparation plants[J]. Fluid Machinery, 2025 , 53 (8) : 36 -43 . DOI: 10.3969/j.issn.1005-0329.2025.08.005
重介质选煤以其分选精度高、处理量大等优势,成为煤炭洗选加工的关键环节[1]。通过精准配置特定密度范围的重介悬浮液,能够高效实现煤中精煤与矸石的有效分离。然而,重介悬浮液的介质组成颇为复杂,主要由煤泥、磁铁矿粉和水构成,同时还包含粒径较小的煤颗粒、矸石颗粒和其他杂质。当含有固态颗粒的重介悬浮液在管道中输送时,不可避免地会对管道产生磨蚀,从而影响管道的使用寿命[2-5]。而安装在管道上的电动球阀,在工作过程中需要频繁进行调节,其启闭过程不仅要承受液体的冲击,还要经受固体颗粒的冲蚀磨损,尤其是固体颗粒的存在,会加剧电动球阀密封面和球体流道的磨损[6-10]。这不仅会影响球阀的工作寿命和工作性能,严重时甚至会导致阀门无法完全关闭,进而使内泄漏风险大幅增加,对工业生产的智能控制造成严重影响。
针对电动球阀冲蚀磨损这一关键问题,一些学者进行了广泛而深入的研究,并取得了显著成果。金浩哲等[11]研制了一套煤气化装置黑水阀冲蚀磨损实时监测系统,能够对黑水阀失效进行预测,阀门使用寿命延长91%。彭东华等[12]深入探究了油气输送过程中沙砾对管道阀门的冲蚀磨损机制,通过数值模拟与实验研究相结合的方法,获取了减小冲蚀磨损的关键参数,为阀门的设计和使用提供了宝贵的指导。雷永强[13]则专注于阀芯开度与壁面磨损的关系模型研究,揭示了不同开度下的磨损规律,为阀门的合理使用提供了重要参考。刘福朋[14]以球阀为研究对象,深入剖析了腐蚀与磨损对球阀芯体的影响,通过应用不同硬质合金涂层,有效解决了黏着磨损和磨粒磨损的双重挑战,取得了显著成效。施宇恒[15]利用有限元法对天然气输送管道球阀的冲蚀磨损性能进行了精细研究,基于微观流动特性和冲蚀磨损情况的分析,提出了具有实际应用价值的结构优化数据。综上可知,对于含有颗粒的气相或液相输送过程而言,球阀的冲蚀磨损是一个难以避免的问题。然而,通过结构优化设计、工艺参数调整,以及界面改性处理等综合措施,可以显著降低球阀的冲蚀磨损程度,从而延长球阀的使用寿命[16],为工业生产的稳定运行提供有力保障。
鉴于选煤重介悬浮液介质具备的特殊性与复杂性,开展电动球阀在输送该介质时的冲蚀磨损失效机理研究显得尤为关键。该研究旨在深入探索重介悬浮液在电动球阀内部的流动冲蚀特征,揭示磁铁矿粉颗粒对球阀的冲蚀作用原理,并掌握磨损的分布规律。通过微观层面的全面剖析,能够深入理解电动球阀冲蚀磨损失效的内在机制,精准识别影响其冲蚀磨损的主要因素。在此基础上,进一步提出针对选煤重介悬浮液的电动球阀冲蚀防护有效策略,对于显著提升球阀的使用寿命及确保流量调控的稳定性具有重要意义。
重介悬浮液取自某选煤厂重介分选生产车间。采用磁铁矿粉(颗粒密度为4.85 g/cm³,磁性物含量>95%)作为加重质,通过控制磁铁矿粉与水的配比,制备密度为1.45 g/cm³的重介悬浮液。通过烘干法对悬浮液样品进行处理,测定其相关物理性质。粒度分析结果表明,该悬浮液中磁铁矿粉的粒径分布特征如下:粒径<45 μm的颗粒占比为78.12%,粒径为45~74 μm的颗粒占比16.45%,粒径>74 μm的颗粒占比5.43%。由此可见,该重介悬浮液中的颗粒粒径主要分布在74 μm以下,其中,粒径<45 μm的细颗粒占主导地位。
在重介分选工艺中,合格介质桶内的重介悬浮液通过离心泵输送至重介浅槽分选机,其流量由电动球阀进行精确调控,以确保满足生产工艺要求。然而,在实际生产过程中,为适应原煤品质波动和分选精度要求,需对重介悬浮液的密度和流量进行动态调节,致使电动球阀长期处于频繁启闭的工作状态。这一工况导致悬浮液中磁铁矿粉颗粒对球阀密封面及流道产生持续性冲蚀磨损,严重影响阀门的使用寿命和系统运行的稳定性。基于此,研究针对重介悬浮液输送系统中电动球阀的冲蚀磨损问题开展深入分析,以期为提高电动球阀使用寿命提供理论依据和技术支持。
鉴于重介悬浮液体系中存在大量微细固体颗粒,研究采用欧拉-拉格朗日耦合方法进行数值模拟计算。在该方法中,将悬浮液作为连续相处理,采用欧拉法描述其流场特性;同时将固体颗粒作为离散相处理,运用拉格朗日法追踪单个颗粒的运动轨迹。这种方法能够精确获取颗粒在流场中的实时位置、速度等运动特征参数,可有效模拟颗粒-流体、颗粒-颗粒间的相互作用,包括碰撞、分散、聚集等复杂行为。基于牛顿第二定律,单个颗粒的运动方程可表示为:
Fy⃗+Ff⃗+Fp⃗=mdupdt
其中:
Fy⃗=18μρpdp2CDRep24(u⃗-up⃗
Ff⃗=(ρp-ρ)g/ρp
Fp⃗=(ρ/ρp)∇P
式中,Fy⃗为曳力,N;Ff⃗为浮力,N;Fp⃗为压力梯度力,N;m为颗粒质量,kg;up为颗粒速度,m/s;t为时间,s;μ为流体黏度,Pa·s;ρp为颗粒密度,kg/m3;dp为颗粒粒径,m;CD为曳力系数;Rep为颗粒雷诺数;u⃗为流体速度矢量,m/s;ρ为流体密度,kg/m3。
球阀内部流动为湍流,可以选取Realizable k-ε模型开展计算。湍动能方程和湍流耗散率方程分别表述如下:
ρ∂κ∂t+∂(ρuiκ)∂xi=∂∂xi[(μ+μtσκ)∂κ∂xi]+Pk-ρε
ρ∂(ρε)∂t+∂(ρuiε)∂xi=∂∂xi[(μ+μtσε)∂ε∂xi]+ρC1Sε-ρC2ε2κ+νε
式中,κ为湍流动能,m2/s2;t为时间,s;ui为速度分量,m/s;xi为空间坐标;μ为动力黏度,Pa∙s;μt为湍流黏度,Pa∙s;σk为湍动能普朗特数,σk=1.0;Pk为湍动能产生项,kg/(m·s³);ε为耗散率,m²/s³;σε为耗散率普朗特数,σε=1.2;S为应变率张量的模,s-1;C1,C2为经验常数,C1=1.44;C2=1.92。
选用了Oka冲蚀模型进行计算,该模型综合考虑了冲击速度、颗粒尺寸和冲击角度的影响,可以预测球阀界面在重介质颗粒冲击下的冲蚀特征与行为,得到冲蚀率的计算公式如下:
E=K(Vp)n(dp)kf(α)
式中,E为冲蚀率,kg/(m²·s);K为材料系数,与靶材和颗粒的性质有关;Vp为颗粒冲击速度,m/s;n为速度指数;k为颗粒尺寸指数;f(α)为冲击角度函数,表示了冲蚀率与颗粒冲击角的关系。
重介悬浮液电动球阀网格划分模型如图1(a)所示。公称直径DN25,公称压力PN25,球体直径42 mm。阀体材质为铸铁,采用法兰连接,可以用于重介质悬浮液介质输送,介质温度范围-20~150 °C,电源电压DC 24 V,控制信号为调节型,防护等级IP65。采用防爆型执行机构,阀座采用聚四氟乙烯密封材料,现场水平安装。阀门开度变化将会导致流体流动不稳定,为使流场充分发展,同时便于评价冲蚀对阀门后端管道的影响,将阀门前后端管道长度分别设定为20,60 mm。
开展电动球阀的三维模型构建,形成流道模型如图1(b)所示。采用非结构化网格划分方法,实现流道网格划分,对不连续结构、阀座与球体连接区域的网格进行细化,提高了整体网格质量,网格数为1 093 097。为了研究冲蚀对球体流道的作用,可以选择A-A和B-B两个边界,获取冲蚀速率数据进行评价。
在数值模拟中,介质参数的设置严格遵循实际工况条件。模拟介质采用重介质悬浮液,其质量流量设定为88.75 g/s。研究选取了0.8,1.0,1.2,1.5 m/s共4个入口流速水平,同时考虑了20,45,74,125 μm共4种颗粒粒径,以及20%,40%,60%和80%共4个阀门开度等级。通过仿真计算系统研究了入口流速、颗粒粒径和阀门开度等关键参数对球阀冲蚀特性的影响规律。
重介悬浮液成分复杂,含有的磁铁矿粉颗粒硬度高,而且频繁的流量调控导致电动球阀产生冲蚀磨损行为,研究入口流速、颗粒粒度、阀门开度对球阀冲蚀的影响,重点从冲蚀速率、冲蚀面积、球阀密封面和出口管道损伤等方面展开讨论。
当重介质悬浮液颗粒粒径为74 μm、阀门开度为20%时,分别在入口流速为0.8,1.0,1.2,1.5 m/s的条件下,开展冲蚀模拟研究,悬浮液入口流速对冲蚀结果的影响如图2所示。可以看出,随着入口流速的增加,冲蚀速率显著增大,冲蚀速率与颗粒速度密切相关。悬浮液流速的增加会提高磁铁矿粉颗粒的动能,从而增强了颗粒对球体流道表面的冲击力,提高了冲蚀速率。同时,流速的增加也会提高颗粒的冲击载荷,单位时间内与阀体表面发生碰撞的颗粒数量更多。因此,冲蚀率E与(Vp)n成正比,磁铁矿粉颗粒硬度较高,导致冲蚀率较大。
低流速时颗粒运动轨迹相对稳定,主要集中在球体流道迎流面的局部区域,造成点状或线状冲蚀特征。随着流速的增加,湍流程度加剧,颗粒运动轨迹更加复杂,冲蚀面积逐渐增大,形成更大面积的损伤。当流速为0.8 m/s时,颗粒的冲击主要集中在密封面和球体内流道的局部区域,具有典型的点状冲蚀特征,最大冲蚀速率为1.76×10-4 kg/(m2·s),如图3所示。当流速大于1.2 m/s时,磁铁矿粉颗粒的冲蚀范围扩大,导致冲蚀面积显著增加。当流速为1.5 m/s时,最大冲蚀速率增加到1.958×10-3 kg/(m2·s)。高速流动会加剧悬浮液的湍流强度,使颗粒的运动轨迹更加随机,进一步扩大冲蚀的影响范围。随着流速的增加,2个流域的冲蚀速率差异性更大,B-B流域冲蚀速率更高。A-A流域的冲蚀主要集中在中间区域,而B-B流域主要集中在后段区域。这是由于重介悬浮液流经球阀后,在流道形成湍流,悬浮液将先冲击B-B流域,待动能产生损失后,再与A-A流域形成冲蚀。
悬浮液流速对出口管道冲蚀具有显著影响,当转速为0.8 m/s时,磁铁矿粉颗粒的冲击主要集中在球阀出口管道底部水平位置。由于球阀流道结构对流体具有阻力作用,导致流体流动受到影响,颗粒硬度较高,其冲击管道内壁面将产生塑性变形和微裂纹,材料剥离后形成局部凹坑和沟槽等冲蚀特征,这将加剧局部湍流和颗粒冲击,导致冲蚀面积迅速扩大。当流速为1.5 m/s时,颗粒的冲蚀面积不断扩大,导致管道内部冲蚀加剧,其局部冲蚀速率高于球体内流道,将导致电动球阀和管道的疲劳破坏。
当重介质悬浮液入口流速为1.0 m/s、阀门开度20%时,分别针对粒径20,45,74,125 μm的颗粒,开展冲蚀模拟研究,磁铁矿粉颗粒粒径对冲蚀速率的影响如图4所示。可以看出,粒径为20,125 μm时,最大冲蚀速率分别为4.14×10-4,4.71×10-4 kg/(m2·s)。随着颗粒粒径增加,单个颗粒质量较大,在相同的流速下,大颗粒的动能显著高于小颗粒,大颗粒冲击力更强。因此,冲蚀速率随颗粒粒径的增大而增加。当颗粒粒径为125 μm时,由于颗粒数量减少,冲蚀速率逐渐降低。
与20 μm相比,125 μm颗粒对A-A流域的冲蚀作用更强,流经区域的冲蚀速率较高。在流道的入口位置,125 μm颗粒的冲蚀速率更高,冲蚀作用更强,20 μm颗粒冲蚀主要集中在流域的中间区域。B-B流域主要集中在后段区域,20 μm颗粒数量多,造成的流域冲蚀速率更高,如图5所示。不同颗粒粒径时,冲蚀面积存在差异,颗粒粒径越小,单位质量重介悬浮液中含有的颗粒数量越多,湍流作用下,颗粒在重介悬浮液中分布更加广泛,在球体表面形成了均匀的冲蚀区域,导致球阀冲蚀面积越大。大粒径颗粒的冲击力集中,极易在局部区域形成冲蚀,冲蚀速率高,冲蚀面积相对较小,局部冲蚀损伤较大。
出口管道的冲蚀行为同样受颗粒粒径影响。小粒径颗粒容易在管道内壁形成均匀的冲蚀层,影响范围较大,导致整体壁厚减薄。颗粒粒径<74 μm时,颗粒对管道内部面的冲蚀影响较为显著;而当粒径>74 μm时,冲蚀速率相对稳定,但冲蚀面积显著减少。
当重介质悬浮液入口流速为1.0 m/s、颗粒粒径为74 μm时,在阀门开度分别为20%,40%,60%,80%的条件下,开展冲蚀模拟研究。阀门开度对球阀冲蚀的影响如图6所示。
阀门开度直接影响悬浮液的流速和流量。当阀门开度较小时,流道截面积减小,易形成局部高速区,节流作用下悬浮液流速显著增加,导致颗粒的动能均增大,从而加剧了球阀内表面和管道内壁的冲蚀作用。开度20%和40%时,最大冲蚀速率分别为5.77×10-4,2.51×10-4 kg/(m2·s)。当阀门开度较大时,流速降低,冲击角度发生变化,冲蚀作用相对减弱。当开度>60%时,颗粒冲蚀作用最弱,最大冲蚀速率的最小值为3.6×10-5 kg/(m2·s)。当开度>80%时,悬浮液流动不稳定,会产生湍流或涡流,在局部区域的冲蚀速率较高。
开度为20%时,A-A流域的冲蚀速率最大,悬浮液在局部阻力作用下,进入球阀流道后流动不稳定,对全域范围形成冲蚀影响。B-B流域中,冲蚀作用主要集中在流域的后半段,局部冲蚀作用较强。当开度增加到40%,流体受到阻力作用较小,2个流域的冲蚀作用均显著降低,如图7所示。
阀门开度调节将会影响重介悬浮液流动和颗粒分布。当开度为20%时,悬浮液高速流动使颗粒强烈冲击球体内流道和出口管道壁面,形成点状或线状冲蚀坑,冲蚀面积和损伤深度较大。随着开度的增加,流速逐渐降低,流体湍流程度加剧,颗粒在球阀内的运动轨迹更为复杂,增加了与球体及出口管道壁面的碰撞概率,从而扩大了冲蚀面积。
选煤厂重介悬浮液输送用电动球阀,在安装运行30天后,将电动球阀零部件进行拆解,对球体内流道壁面进行检测。结合A-A和B-B流域的冲蚀速率数据可以发现,A-A流域的冲蚀速率小于B-B流域,而B-B流域中间区域的冲蚀速率相对较高,重介悬浮液对界面的冲蚀作用较强,极易造成材料损伤。因此,可以选取B-B流域长度15~20 mm的材料为研究对象,运用电子显微镜研究表面的冲蚀行为特征[17]。电动球阀球体流道的冲蚀坑特征如图8所示。
球体表面与内流道壁面均呈现出显著的冲蚀形貌特征。研究表明,磁铁矿粉颗粒在高速流动的悬浮液中获得动能,当其通过电动球阀时,颗粒对球体表面和内流道壁面产生强烈的冲击作用。这种冲击作用导致材料表面发生塑性变形,进而引发切削磨损和疲劳破坏的耦合作用机制。在此过程中,流体接触表面的粗糙度呈现渐进式增加趋势,并在局部冲蚀作用下形成明显的应力集中现象。随着冲击次数的累积,表面局部区域萌生微裂纹,这些微裂纹在应力作用下逐步扩展并相互连接,最终导致材料剥落并形成典型的冲蚀坑形貌。
冲蚀后材料表面特征是不均匀的,这与颗粒粒径有密切关系。小粒径颗粒冲蚀过程中,在材料表面形成了均匀的切削磨损,冲蚀后材料表面存在浅层剥落特征,剥落后形成的冲蚀坑数量较多,但冲蚀坑面积和深度较小,冲蚀坑直径为10~20 μm,冲蚀坑边界较为清晰,相互间并无关联,如图8(a)所示。但对于大颗粒而言,冲击作用强,载荷相对较为集中,导致材料表面局部塑性变形或产生裂纹,形成了深层剥落的冲蚀坑,单个冲蚀坑的面积较大且形状不规则,冲蚀坑直径为20~50 μm,冲蚀坑边界不明显,不同冲蚀坑之间相互联通,如图8(b)所示。电动球阀表面冲蚀特征将会进一步加速材料的疲劳破坏,影响其工作稳定性和可靠性。
(1)重介悬浮液中的磁铁矿粉颗粒对电动球阀具有显著冲蚀作用,其损伤机制主要受流体流速、颗粒粒径及阀门开度的影响,其中,入口流速的影响最为关键,其次是阀门开度和颗粒粒径。
(2)冲蚀坑的形成源于高速流体冲击导致的表面微裂纹扩展与材料剥落,其分布不均匀性与颗粒粒径密切相关。研究表明,小颗粒(<45 μm)的冲蚀影响有限,而大颗粒(>45 μm)冲击形成的20~50 μm冲蚀坑会显著降低阀门密封性能与长期可靠性。
(3)通过优化运行参数(入口流速<1.0 m/s、颗粒粒径<45 μm、阀门开度为60%~80%),可有效降低球阀及出口管道的冲蚀速率,平衡流体流动稳定性与材料磨损,从而延长设备使用寿命,为选煤厂重介悬浮液输送系统的电动执行器优化设计提供了理论依据与工程参考。

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2025年第53卷第8期
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doi: 10.3969/j.issn.1005-0329.2025.08.005
  • 接收时间:2025-03-04
  • 首发时间:2026-10-20
  • 出版时间:2025-08-30
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  • 收稿日期:2025-03-04
  • 修回日期:2025-06-02
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    1中选智控(天津)科技有限公司,天津 300131
    2国能准能集团选煤厂,内蒙古 鄂尔多斯 010300
    3中国矿业大学 化工学院,江苏 徐州 221116
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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