JP60涡轮增压器压气机性能模拟与试验

本文采用Numeca数值分析软件建立了JP60增压器压气机总成内部网格模型,并计算出稳态增压器压气机性能曲线,将模拟结果与试验所测取的JP60压气机运行曲线进行了对比,结果表明:模拟分析曲线与试验曲线变化趋势一致。此外,对压气机内部流场的分布也进行了分析,为该增压器的优化设计提供理论依据。     

电力设备生产企业IS014001环境管理体系标准导入

结合大型电力设备生产企业自身特点,设计了导入ISO14001环境管理体系标准的模块和具体流程,对导入ISO14001环境管理体系标准进行战略规划,探讨了建立企业自身ISOI4001环境管理体系标准的方法,并对ISO14001环境管理体系标准的实施进行了详细说明和举列.结果表明,企业导入ISO14001环境管理体系标准能起到节能减排、保护环境、改善工艺、提高效益和提升国际竞争力等作用.     

Energy efficiency in long-term Mediterranean cropping systems with different management intensities

Optimising the implementation of energy used in agriculture is an important objective in the “Climate Action and Renewable Energy Package” adopted by the European Union. Therefore, studying the management of different cropping systems represents a good method to optimise input requirements, yield and net energy supply. The aim of this study is to compare the energy use of a 12-year rainfed cropping system, located in Tuscany, Italy. The system is cultivated under two different management intensities: a conventional system (CS) and a low input system (LIS) for a six-year crop rotation that included sugar beet, durum wheat, sorghum, sunflower, and durum wheat. In the sixth year, the soil was set-aside. The results showed that crop yield and energy yield were not significantly affected by management intensities, whereas energy efficiency of the low input system increased significantly, by about 30%. Future research should include more crops and locations to obtain further information about the range of energy parameters and their long-term trends. Furthermore, could be interesting to evaluate the overall reduction of environmental impacts and production costs that could occur limiting the use of chemicals and adopting conservative soil tillage strategies.     

Comparison by the use of numerical simulation of a MCFC-IR and a MCFC-ER when used with syngas obtained by atmospheric pressure biomass gasification

In order to realize biomass potential as a major source of energy in the power generation and transport sectors, there is a need for high efficient and clean energy conversion devices, especially in the low-medium range suiting the disperseness of this fuel. Large installations, based on boiler coupled to steam turbine (or IGCC), are too complex at smaller scale, where biomass gasifiers coupled to ICEs have low electrical efficiency (15-30%) and generally not negligible emissions.This paper analyses new plants configurations consisted of Fast Internal Circulated Fluidized-Bed Gasifier, hot-gas conditioning and cleaning, high temperature fuel cells (MCFC), micro gas turbines, water gas shift reactor and PSA to improve flexibility and electric efficiency at medium scale. The power plant feasibility was analyzed by means of a steady state simulation realized through the process simulator Chemcad in which a detailed 2D Fortran model has been integrated for the MCFC. A comparison of the new plant working with external (MCFC-ER) and internal (MCFC-IR) reforming MCFC was carried out. The small amount of methane in the syngas obtained by atmospheric pressure biomass gasification is not enough to exploit internal reforming cooling in the MCFC. This issue has been solved by the use of pre-reformer working as methanizer upstream the MCFC. The results of the simulations shown that, when MCFC-IR is used, the parameters of the cell are better managed. The result is a more efficient use of fuel even if some energy has to be consumed in the methanizer. In the MCFC-IR and MCFC-ER configurations, the calculated cell efficiency is, respectively, 0.53 and 0.42; the electric power produced is, respectively, 236 and 216 kW_e, and the maximum temperature reached in the cell layer is, respectively, 670 °C and 700 °C. The MCFC-ER configuration uses a cathode flowrate for MCFC cooling that are 30% lower than MCFC-IR configuration. This reduces pressure drop in the MCFC, possible crossover effect and auxiliaries power consumption. The electrical efficiency for the MCFC-IR configuration reaches 38%.     

具有整体围带和凸台拉筋汽轮机长叶片阻尼振动特性实验研究

阻尼围带和凸台拉筋结构在大型汽轮机叶片中被广泛采用来增加叶片阻尼,降低其振动应力.设计并建造了阻尼结构叶片振动特性实验台,对一具有阻尼围带和凸台拉筋汽轮机长叶片的阻尼器接触面施加不同转速下的正压力进行了振动特性测试,得到了不同转速正压力下叶片的频响曲线和模态阻尼比.试验结果表明:只有围带接触时,随着转速的增加,叶片模态阻尼比先增后减;围带和拉筋都接触时,也存在同样的现象.当转速大于2 600r/min后,叶片的共振频率基本不变且模态阻尼比与自由叶片时基本一致.     

基于AUTOCAD工程制图图纸标注的技术处理

主要研究了利用AUTOCAD绘制工程图时 ,如何使图纸上的标注符合《机械制图》国家标准 ,介绍了尺寸标注、极限与配合、形状与位置公差和非 1 :1比例下的尺寸标注的实现方法 ,这些实现方法对正确设计工程图 ,有着实际的指导作用     

廊固凹陷异常压力与天然气的分布和产出关系

重点阐述异常压力对天然气的分布影响关系。以冀中地区廊固凹陷第三系地层为研究对象，对异常压力的分布特征、天然气聚集区的异常压力与天然气产量关系等进行了分析。通过分析认为，异常压力与天然气分布聚集规律有着密切联系，分析的天然气分布聚集与产出规律对勘探开发有指导作用。     

吐哈盆地台北凹陷三角洲沉积与成岩作用

吐哈盆地台北凹陷中侏罗统三间房组沉积时,凹陷北部因地形较陡,发育扇三角洲;凹陷南部因地形较缓,发育辫状河三角洲。分流河道沉积的碎屑岩复合体在扇三角洲和辫状河三角洲沉积中非常发育,是其沉积主体。三间房组碎屑岩的成岩作用主要为机械压实作用、胶结作用和溶解作用。凹陷北部扇三角洲前缘碎屑岩体以机械压实作用为其主要特征,溶蚀作用微弱,碎屑岩体在强烈的机械压实作用改造下,原生粒间孔大部分消失,成为低孔低渗的致密储集体;凹陷南部辫状河三角洲以自生矿物的胶结作用和不稳定组分的溶解作用为特征,由于刚性物质含量较高,因而虽经机械压实作用,但却保留了较多的残余粒间孔,碎屑岩体在溶蚀作用的改造下,成为物性良好的储集体。     

一种新型的室温快速固化胶黏剂的研制

本文开发了一种新型的方舱夹芯板用室温固化高强度环氧结构胶黏剂,验证了其物化特性、相关力学性能和环境适应性.结果表明此胶黏剂具有优良性能,可以满足方舱用大板胶黏剂的使用需求.     

磨损套管螺纹接头密封面力学特性

螺纹接头磨损是影响套管密封完整性的主要原因之一。由于套管螺纹接头结构特征复杂,常规计算模型无法得到解析解,实验研究也较困难,因此针对磨损条件下接头密封面力学特性的研究很少。鉴于此,建立了均匀磨损、偏心筒型磨损和月牙型磨损3种磨损形式的套管螺纹接头三维弹塑性有限元模型,基于ABAQUS软件分析了磨损深度为5 mm时套管螺纹接头在复杂载荷条件下的应力应变特征,研究了上扣扭矩、轴向拉力和弯矩作用下3种磨损形式对套管螺纹接头密封面力学特性的影响。研究结果表明,均匀磨损套管螺纹接头的密封面上存在较大塑性应变,且接触力比其他磨损形式大,密封失效风险较高。偏心筒型和月牙型磨损使得套管螺纹接头密封面接触面积、环形密封带最窄处接触宽度都有所降低,增加了接头局部漏失风险,影响套管螺纹接头的密封可靠性。