浅谈矿热炉炉盖内衬结构的施工对比

通过对矿热炉炉盖内衬结构的3种施工模式进行对比,提出了炉盖内衬采用轻质浇注料与重质浇注料分层浇注模式的优点,力求达到改善和延长炉盖使用寿命,提高矿热炉冶炼水平,降低热损失,提高经济效益。     

Synthesis of ZnO/Cu micro and nanostructures via a vapor phase transport method using different tube systems

ZnO micro and nanostructures were grown on copper coated silicon substrates using two different systems: an opened system (both ends opened tube) and a closed system (one closed end tube). The thermodynamic conditions of the systems made a significant difference in boundary layer and super-saturation between the systems. The results indicate that diffusion of the gaseous species through the boundary layers at low and high pressures controls the final formation of the morphologies. The ZnO nanostructures which have been grown in a restricted place have larger diameters and lengths. The structure of the products was analyzed by X-ray diffractometer (XRD) and it was found that the good crystalline quality of the samples was obtained in a closed system. To study the optical properties, photoluminescence (PL) and ultra violet–visible (UV–vis) spectroscopy were employed. It was observed that a decrease in the growth temperature of the opened system caused a broad and dominant visible emission covering the blue and green emission in the PL spectra.     

Synthesis of parallel squared nanosheet-assembled Bi2WO6 microstructures under alkalescent hydrothermal treatment

The hierarchical Bi₂WO₆ microstructures, which were two-dimensionally assembled by parallel squared nanosheets, were synthesized under alkalescent hydrothermal treatment. The crystalline phase, morphology, size, lattice plane and crystalline structure of the products were characterized by X-ray diffraction, scanning/transmission electron microscopy and selected area electron diffraction. The formation of parallel squared nanosheet-assembled hierarchical Bi₂WO₆ microstructures was elucidated by the oriented attachment growth mechanism based on our experimental results. The aqueous ammonia, which was employed as the alkalescent environment, had a critical effect on the formation of such hierarchical Bi₂WO₆ microstructures with a large proportion of {001} facets. The parallel squared nanosheet-assembled hierarchical Bi₂WO₆ microstructures obtained at the hydrothermal temperature of 120 °C showed high photocatalytic activity under visible-light irradiation.     

碳溶反应温度对高反应性焦炭热态性能的影响

以钢渣为催化剂添加至焦煤中制备高反应性焦炭,研究碳溶反应温度对焦炭热态性能的影响及焦炭反应后的结构变化。结果表明,添加钢渣后,焦炭的反应性提高;随着碳溶反应温度的升高,焦炭的反应性呈线性增加,而反应后强度先缓慢降低然后迅速劣化;焦炭反应后的比表面积先增大而后减小。     

不同化学结构的PP对热塑性弹性体复合材料性能的影响

研究了不同化学结构的聚丙烯(PP)对苯乙烯-乙烯/丁烯-苯乙烯共聚物(SEBS)/白油/PP热塑性弹性体复合材料力学性能和流动性能的影响。结果表明,复合材料的力学性能与所添加PP的力学性能保持一致,按照均聚PP、无规共聚PP、共聚PP的化学结构特性,复合材料的拉伸性能、弯曲性能和硬度都依次变小;但是复合材料的流动性能不仅和PP的熔体质量流动速率(MFR)有关系,而且还与PP和SEBS的相互作用有关。在PP的MFR相同的情况下,复合材料的MFR按照均聚PP、无规共聚PP、共聚PP的不同依次降低。     

煤基均聚聚丙烯1100N与市场同类石油基产品链结构组成与性能对比分析研究

采用核磁共振仪、傅里叶红外光谱仪、热重分析仪、差示扫描量热仪和力学测试等手段,研究了煤基均聚聚丙烯1100N及对比牌号链结构等微观结构、结晶行为、热性能及力学性能等。结果表明,与市场石油基同类产品相比,煤基均聚聚丙烯1100N具有链结构缺陷低、等规度高、易结晶、耐热性能和刚性好的优势,但抗冲击性能略低于同类产品。     

负压力角弧齿离合器铣齿机关键结构设计与加工仿真

负压力角弧齿离合器因承载能力强、啮合性能好、传动可靠性高等优势,被广泛应用于重型卡车驱动桥主减速器总成中。对负压力角弧齿离合器加工用的专用铣齿机的关键部件设计技术进行研究,构建铣齿加工数学模型,根据加工特点开展刀具箱、工件箱的结构功能分析,基于仿真软件建立等效机床模型,编制加工程序完成凸面齿与凹面齿的加工仿真与分析,验证了铣齿机设计方案的正确性。     

6-DOF主动波浪补偿液压平台的结构优化分析

开展6-DOF船用主动波浪补偿液压平台结构优化设计,旨在提升波浪补偿液压平台承载和空间补偿能力,减小补偿平台体积和质量。依据海浪运行形态给定六自由度船用波浪补偿液压平台所需的补偿参数指标,利用虚拟样机技术,在ADAMS软件仿真环境中建立该平台的参数化模型;以其最大负载为优化目标,对该参数化模型的结构尺寸进行优化,得到该平台结构尺寸的优化结果。结果表明：优化后,六自由度船用波浪补偿液压平台的负载能力较最初增加了约15%,支腿液压缸的行程减小了约13%,平台负载能力提升且结构更加紧凑合理。为检验此次对平台结构尺寸优化的有效性,利用SolidWorks软件建模,并导入ADAMS软件中仿真,检验了模型的补偿能力。     

穿越型扩张式封隔器的研制与试验

渤海油田采用大段防砂完井,防砂段内小层多,地层非均质严重,层间矛盾突出,注水开发效果难以进一步提高。为了实现细分层系开发,除了防砂管柱外层与层封隔,还需要在防砂管柱内相应位置配合形成管内封隔。为了适应不同分层采油注水工艺措施,研制穿越型扩张式封隔器,介绍该封隔器的应用环境、结构、工作原理等,并对该封隔器进行了室内试验和现场试验。结果表明：穿越型扩张式封隔器能顺利实现外径 6.35 mm的管线穿越,无遇阻,所设置的保护功能可有效保护管线,能按要求顺利坐封、解封,中心打压16 MPa,上下环空承压均可达15 MPa,最大可满足 157.1 mm内径密封要求,满足现场不同应用环境的需求。     

Bioengineering of river earth embankment using natural fibre-based composite-structured geotextiles

A Jute-HDPE composite structured geotextile was developed to improve the performance of earthen structure of river embankment. The optimized geotextiles (430 g/m²) containing 86% natural component (on weight) having better physical, mechanical (tensile strength, 10 kN/m (machine direction) and 18 kN/m (cross direction), index puncture (163 kN) and CBR (1.5 kN)), hydraulic (AOS 178 μ) and endurance properties than 100% HDPE geotextiles. A coconut fibre geotextile net was placed over jute-polyolefin geotextiles to resist washing-off of loose cover soil until the establishment of vegetation. Placing of continuous seamless geotextile tube (weight 196.2 kg/m) filled with moist river sand at the anchor trench-cum-toe guard assisted in safeguarding from eddies. It was observed that initially closed structure of the geotextile assisted in efficient filtration leading to soil stabilization through compactness of soil layer (14 cm thick). The uniqueness of work lies in conversion of closed structure of geotextiles to open-mesh of HDPE slit film on degradation of jute, remained beneath the cover-soil, through which grass root penetrated the geotextiles sheet and riveted both the layers of soil, the cover and the compacted back layers. The remnant synthetic part thus acts as durable reinforcing element and its increased porosity provides breathability for growth of soil flora and fauna. Bermuda grass turf provided very high nailing strength (658.8 kN/m²) with the soil through intertwining of grass roots with durable synthetic network.