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离心泵宽高效水力设计方法的研究及应用

节能技术 2024年第4期42卷 353-358页

作者：王者文李杰军侯多华乔玉兰吴冒晶上海凯泉泵业(集团)有限公司上海201804 赛莱默(中国)有限公司上海200051

为了达到离心泵宽高效,以实现泵设备节能增效的目的。本文通过对离心泵宽高效机理的分析,揭示了离心泵宽高效的基本规律。提出了泵设计中采用叶片分区设计的方法,即叶片包角范围内共分三个区,即非控制区、过渡区和控制区。具体地讲首先... 详细信息

为了达到离心泵宽高效,以实现泵设备节能增效的目的。本文通过对离心泵宽高效机理的分析,揭示了离心泵宽高效的基本规律。提出了泵设计中采用叶片分区设计的方法,即叶片包角范围内共分三个区,即非控制区、过渡区和控制区。具体地讲首先设计泵叶片进口角-出口角的角度分布线,同时应用微积分方程求解方格网中的保角变换线,进而产生宽高效的离心泵叶轮型线。试验结果表明此叶轮设计方法达到了离心泵宽高效的节能特性,电动机的配套功率或输入功率变小。离心泵宽高效机理和试验都证明了离心泵叶轮的叶片进口角至出口角分布线的形状是决定离心泵宽高效的关键因素。

关键词：宽高效离心泵叶片分区设计叶片角度分布线叶片最优包角叶片转折角

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The effects of sulfide stress cracking on the mechanical properties and intergranular cracking of P110 casing steel in sour environments

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Petroleum Science 2013年第3期10卷 385-394页

作者： hou duo Zeng Dezhi Shi Taihe Zhang Zhi Deng Wenliang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University

Variation and degradation of P-110 casing steel mechanical properties, due to sulfide stress cracking （SSC） in sour environments, was investigated using tensile and impact tests. These tests were carried out on specimens, which were pretreated under the following conditions for 168 hours： temperature, 60 ℃; pressure, 10 MPa; H2S partial pressure, 1 MPa and CO2 partial pressure, 1 MPa; preload stress, 80% of the yield strength （os）; medium, simulated formation water. The reduction in tensile and impact strengths for P-110 casing specimens in corrosive environments were 28% and 54%, respectively. The surface morphology analysis indicated that surface damage and uniform plastic deformation occurred as a result of strain aging. Impact toughness of the casing decreased significantly and intergranular cracking occurred when specimens were maintained at a high stress level of 85% %.

关键词： Acidic solutions high-temperature corrosion hydrogen embrittlement intergranular corrosion sulfide stress cracking

Stress Corrosion Cracking of High-strength Drill Pipe in Sour Gas Well

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Journal of Wuhan University of Technology(Materials Science) 2014年第4期29卷 813-816页

作者：张智 LI Jing ZENG Dezhi HU Junying hou duo ZHANG Liehui SHI Taihe State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University

In high sour gas reservoir drilling process, it happens occasionally that high-strength drill pipe suffers brittle fracture failure due to stress corrosion cracking, and poses serious hazard to drilling safety. To solve this problem, this paper studied the stress corrosion cracking mechanism and infl uencing factors of highstrength drill pipe in sour environment with hydrogen permeation experiments and tensile tests. We simulated practical conditions in laboratory and evaluated the stress corrosion cracking performance of the high-strength drill pipe under conditions of high stress level. For the problems occurring in use of high-strength drill pipe on site, the paper proposed a technical measure for slower stress corrosion cracking.

关键词： sour environment high-strength drill pipe stress corrosion cracking

Synergistic effect of erosion and hydrogen on properties of passive film on 2205 duplex stainless steel

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Journal of Materials Science & Technology 2021年第8期67卷 1-10页

作者： Jiuyi Li Xiankang Zhong Tianguan Wang Tan Shang Junying Hu Zhi Zhang Dezhi Zeng duo hou Taihe Shi State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China

Stainless steels have shown great potential in the application of offshore oil and gas ***,the internal surface of stainless steel pipeline may simultaneously suffer erosion from the fluid media inside the pipeline and the damage of hydrogen that is generated from the external activities such as cathodic *** synergistic effect of erosion and hydrogen on the properties of passive film on 2205 duplex stainless steel was studied for the first time in a loop system coupled with a hydrogen-charging *** components,protective performance and semiconductive structure as well as properties of the passive film under different conditions were investigated using in-situ electrochemical techniques,surface characterization and computational fluid dynamics *** results show that the combination of erosion and hydrogen could greatly thin the passive film,furthermore,the Fe^(3+)/Fe^(2+)ratio and O_(2)^(-)/OH^(-)ratio in the passive film also decrease dramatically under such a ***,the hydration degree of the passive film greatly increases,resulting in an increase in active sites and a decrease in the stability of the passive *** could destroy the passive film through the impact of sand particles and accelerate the mass transfer process of electrochemical *** hydrogen can not only enhance the charge transfer process,but also make the passive film highly *** the combination of erosion and hydrogen condition,erosion could enhance the hydrogen damage and simultaneously hydrogen could also enhance ***,the synergistic effect of erosion and hydrogen could dramatically change the passive film component,decrease the protective performance,and increase the susceptibility of pitting corrosion of 2205 stainless steel in Cl-containing environment.

关键词： Corrosion Erosion Hydrogen Stainless steel

MXene@c-MWCNT Adhesive Silica Nanofiber Membranes Enhancing Electromagnetic Interference Shielding and Thermal Insulation Performance in Extreme Environments

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Nano-Micro Letters 2024年第10期16卷 82-98页

作者： Ziyuan Han Yutao Niu Xuetao Shi duo Pan Hu Liu Hua Qiu Weihua Chen Ben Bin Xu Zeinhom MEl-Bahy Hua hou Eman Ramadan Elsharkawy Mohammed AAmin Chuntai Liu Zhanhu Guo Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002People's Republic of China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026People's Republic of China Key Laboratory of Multifunctional Nanomaterials and Smart Systems Advanced Materials DivisionSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123People's Republic of China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'an 710072People's Republic of China College of Chemistry&Green Catalysis Center Zhengzhou UniversityZhengzhou 450001People's Republic of China Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon Tyne NE18UK Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City 11884CairoEgypt Department of Chemistry Faculty of ScienceNorthern Border UniversityArarSaudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 1109921944 TaifSaudi Arabia

A lightweight flexible thermally stable composite is fabricated by com-bining silica nanofiber membranes(SNM)with MXene@c-MWCNT hybrid *** flexible SNM with outstanding thermal insulation are prepared from tetraethyl orthosilicate hydrolysis and condensation by electrospinning and high-temperature calcination;the MXene@c-MWCNT_(x:y)films are prepared by vacuum filtration *** particular,the SNM and MXene@c-MWCNT_(6:4)as one unit layer(SMC_(1))are bonded together with 5 wt%polyvinyl alcohol(PVA)solution,which exhibits low thermal conductivity(0.066 W m^(-1)K^(-1))and good electromagnetic interference(EMI)shielding performance(average EMI SE_(T),37.8 dB).With the increase in func-tional unit layer,the overall thermal insulation performance of the whole composite film(SMC_(x))remains stable,and EMI shielding performance is greatly improved,especially for SMC_(3)with three unit layers,the average EMI SET is as high as 55.4 *** addition,the organic combination of rigid SNM and tough MXene@c-MWCNT_(6:4)makes SMC_(x)exhibit good mechanical tensile ***,SMC_(x)exhibit stable EMI shielding and excellent thermal insulation even in extreme heat and cold ***,this work provides a novel design idea and important reference value for EMI shielding and thermal insulation components used in extreme environmental protection equipment in the future.

关键词： SiO_(2)nanofiber membranes MXene@c-MWCNT Composite film Thermal insulation Electromagnetic interference shielding

Involutions Fixing the Disjoint Union of Copies of Even Projective Space

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Acta Mathematica Sinica,English Series 1996年第2期12卷 162-166页

作者： hou duo Bruce Torrence hou duo Department of Mathematics Hebei Teachers University Shijiazhuang,050016 ChinaBruce Torrence Department of Mathematics Georgetown University Washington,D.C.20057 U.S.A. 河北师范大学数学系河北石家庄 050016 Georgetown University 美国

We show that for any differentiable involution on an r-dimensional manifold(M,T) whose fixed point set F is a disjoint union of real projective spaces of constant dimension 2n,we have:if r=4n then(M,T)is bordant to(F... 详细信息

关键词： Involution Cobordism

氢对酸性气田低合金钢氢渗透及应力腐蚀行为的影响

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稀有金属材料与工程 2020年第11期49卷 3734-3740页

作者：王霞周雯洁侯铎蒋欢侯丽西南石油大学材料科学与工程学院四川成都610500

采用电化学氢渗透、慢应变速率拉伸(SSRT)实验和体视显微镜、SEM观察断口形貌的方法研究80SS低合金油管钢在饱和CO2模拟采出水环境中,氢对氢渗透和应力腐蚀开裂行为的影响。结果表明,随着溶液H+浓度增大,酸性的增加,氢渗透参数i∞、D和... 详细信息

采用电化学氢渗透、慢应变速率拉伸(SSRT)实验和体视显微镜、SEM观察断口形貌的方法研究80SS低合金油管钢在饱和CO2模拟采出水环境中,氢对氢渗透和应力腐蚀开裂行为的影响。结果表明,随着溶液H+浓度增大,酸性的增加,氢渗透参数i∞、D和H0C均会增大,有助于氢原子的扩散行为;在拉应力和氢原子的协同作用下,与空拉对比,80SS低合金钢的断裂时间减少了近50%,发生了由韧性断裂到脆性断裂的变化,随着溶液氢浓度的增大,对钢材引起的力学损伤增强,应力腐蚀敏感性增大;80SS钢在含饱和CO2采出水介质中拉伸时,预充氢前后的指数Iδ由3.16%增大到8.49%,预充氢加大了试样的应力腐蚀开裂敏感性;在含1%HAc(质量分数)的饱和CO2采出水中拉伸时,预充氢前的微观形貌呈现出河流花样,出现准解理断裂特征,而预充氢后的80SS钢纤维区分布有不连续裂纹和小孔状结构,与预充氢前的相比,预充氢增加了钢的塑性性能,降低了钢材的应力腐蚀开裂敏感性。

关键词： 80SS低合金钢氢渗透慢应变拉伸预充氢应力腐蚀敏感性 SEM

深水深井高温高压水泥石固化养护及制备方法研究

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石油钻采工艺 2022年第3期44卷 291-296页

作者：刘书杰武治强吴怡侯铎张智中海油研究总院有限责任公司西南石油大学

深水深井面临超深、超高温超高压、复杂储层等特殊地质条件,对固井水泥石的综合力学性能提出了更高要求,急需适用于高温高压工况的水泥石固化养护及制备方法,从而准确可靠地评价和优化水泥浆体系。设计并建立了高温高压水泥浆固化养护... 详细信息

深水深井面临超深、超高温超高压、复杂储层等特殊地质条件,对固井水泥石的综合力学性能提出了更高要求,急需适用于高温高压工况的水泥石固化养护及制备方法,从而准确可靠地评价和优化水泥浆体系。设计并建立了高温高压水泥浆固化养护装置及水泥石制备方法,精准模拟了深水深井高温高压(150 MPa、250℃)工况水泥浆固化养护过程,分析对比了不同温度、压力条件下所制备水泥石的单轴抗压强度、抗拉强度等力学性能。结果表明:所建立的高温高压工况水泥石固化养护及制备方法可准确模拟深水深井高温高压井筒工况条件,同时高温高压条件亦可充分发挥水泥浆体系助剂的性能优势,测试发现运用该方法制备的水泥石与常规方法制备的水泥石在抗压强度、抗拉强度等力学性能方面存在显著差异。该方法的提出有利于促进深水深井高温高压水泥浆体系固化养护和水泥石制备技术的发展,为固井水泥浆体系配方优化提供实验方法和技术支撑。

关键词：深水深井高温高压固井水泥石固化和养护

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弯曲输流管路振动特性分析

四川轻化工大学学报（自然科学版） 2023年第6期36卷 34-40页

作者：侯舵杨翊仁西南交通大学力学与航空航天学院成都611756

以非平面Z形空间弯曲管路为研究对象,基于ANSYS Workbenchg平台建立了有限元模型,进行了流固耦合振动特性分析。结果表明,在流固耦合作用下,此空间弯曲管路前六阶固有频率降幅约为17.0%;弯曲半径每增加20 mm,前六阶固有频率增幅为1.0%~3... 详细信息

以非平面Z形空间弯曲管路为研究对象,基于ANSYS Workbenchg平台建立了有限元模型,进行了流固耦合振动特性分析。结果表明,在流固耦合作用下,此空间弯曲管路前六阶固有频率降幅约为17.0%;弯曲半径每增加20 mm,前六阶固有频率增幅为1.0%~3.0%;弹性模量每增加10 GPa,前六阶固有频率增幅约2.5%;输送介质由空气变为柴油,前六阶固有频率降幅约13.0%;输送介质由柴油变为原油,前六阶固有频率降幅约3.7%。流固耦合作用会降低非平面Z形空间弯曲管路的前六阶固有频率,但对管路的振型没有影响,弯曲半径和弹性模量的增加会增大管路固有频率,输送介质密度对固有频率影响显著。

关键词：振动特性空间弯曲管路 ANSYS 流固耦合模态固有频率振型