牙哈处理站天然气预冷改造历程

牙哈凝析气田进站天然气预冷是凝析气处理的关键部分,天然气预冷对牙哈凝析气处理有着重大意义。但由于牙哈作为全国第一个开发的凝析气田,可以借鉴的经验很少。因此,从它投产至今一直在不断总结,目的是为后面的凝析气田开发提供宝贵的经验。     

玻璃行业窑炉余热利用与烟气环保治理一体化的研究与应用

随着国家"十二五"对节能减排的深入推进,玻璃作为高耗能、高污染的行业被国家纳入控制范围中,受玻璃生产特点和烟气特点的制约,一直以来,如何将窑炉的节能与减排有效地结合起来,是一项有利于国家、有利于社会,也有利于企业健康发展的重要课题。本文重点结合玻璃生产实际案例进行分析,提出有效的解决办法。结果表明,将窑炉的余热利用发电、窑炉烟气的脱除NO、脱除SO、除尘一体化的方案是未来玻璃行业的必然选择。X2     

In掩膜层超分辨光盘的读出研究

在超分辨光存储技术中,掩膜层材料是决定其性能优劣的关键。In薄膜可以作为掩膜层用来实现超分辨信息点的动态读出。采用直流磁控溅射法制备不同厚度的In薄膜,用台阶仪测量薄膜厚度随时间的变化关系,用原子力显微镜观察不同厚度薄膜样品的表面形貌。在预刻有尺寸为390nm信息点的光盘盘基上制备In薄膜,从而形成In掩膜超分辨光盘。利用光盘动态测试仪进行动态读出,最高读出载噪比(CNR)达到26dB。为了进一步分析超分辨动态读出的物理机理,采用变温椭圆偏振光谱仪测量In薄膜在不同温度下的光学常数,得到In薄膜在不同温度下的反射率和吸收系数。分析表明In掩膜超分辨光盘的读出机理符合孔径型超分辨读出模型。     

铝合金几字梁组合体系在清水混凝土中的应用

以京东集团西南总部大厦项目的超高劲性清水混凝土施工为例,自主研发了铝合金几字梁木模板组合体系,成功解决了在施工超高、超厚墙体时所存在的诸多问题,提高了清水混凝土蝉缝、明缝、螺栓孔的成形质量。同时,铝合金几字梁组合体系整体性强、支拆简便,能提高施工的效率,从而为高标准实现清水混凝土饰面效果提供了可靠保障。     

Hot workability of Mg-9Y-1MM-0.6Zr alloy

The behavior evolvement of Mg-9Y-1MM-0.6Zr (WE91) alloy during hot deformation process was discussed. The flow stress behavior of magnesium alloy over the strain rate range of 0.001 to 1 s-1 and the temperature range of 653 to 773 K was studied on a Gleeble-1500D hot simulator under the maximum deformation degree of 60%. The experimental results showed that the relationship between stress and strain was obviously affected by the strain rate and deformation temperature and the flow curves observed were typical of the occurrence of dynamic recrystallization. The flow stress of WE91 magnesium alloy during high temperature deformation could be represented by the Zener-Hollomon parameter in the hyperbolic Arrhenius-type equation. The average deformation activation energy Q and strain coefficient n were 224.11 kJ/mol and 3.08 by calculation,respectively. The processing maps were calculated and analyzed according to the dynamic materials model. The map at strain of 0.916 exhibited three domains with peak efficiency of 49%,44% and 42%,respectively. It was found that the alloy could be extruded at 693 K with mechanical properties of σ0.2=240 MPa,σb=315 MPa and δ=15.5%.     

K_2CO_3溶液处理对费托合成熔铁催化剂性能的影响

以高频感应炉制备了熔铁催化剂,并进行了K2CO3溶液处理,采用ICP、XRD和H2-TPR等手段,对费托合成熔铁催化剂的物相与组成进行表征。于固定床积分反应器中进行催化剂的费托合成性能评价,反应条件为220℃~350℃,2.0MPa,V(H2)/V(CO)=2,GHSV=3000h-1。结果表明,由于石墨坩埚的使用,使得感应炉制备的熔铁催化剂中引入了大量的Si和Al元素,这些元素与铁氧化物形成固熔体,造成催化剂难以被还原、表面碱度严重被削弱、产物以低碳烃为主。经K2CO3溶液处理后,催化剂中固熔体部分被溶解,还原难度逐步降低。同时,随着K2CO3溶液浓度的增加,催化剂的表面碱度逐渐增强,产物中CH4选择性由44.82%降到28.82%,C2~C4烯烃选择性也逐渐增加。     

Homogenization heat treatment of Mg-7.68Gd-4.88Y-1.32Nd-0.63Al-0.05Zr alloy

The microstructures and mechanical properties of the Mg-7.68Gd-4.88Y-1.32Nd-0.63A1-0.05Zr magnesium alloy were investigated both in the as-cast condition and after homogenization heat treatment from 535 to 555 ℃ in the time range 0-48 h by op- tical microscopy, scanning electron microscopy and hardness measurement. The as-cast alloy consisted of ct-Mg matrix, Mgs（Y0.5Gd0.5） phase which is a eutectic phase, strip of Al2（Y0.6Gd0.4） phase, little A13Zr and Mg（Y3Gd） phase. With the increasing of homogenization temperature and time, the Mgs（Y0.5Gd0.5） phase was completely dissolved into the matrix. The Al2（Y0.6Gd0.4） phase was almost not dissolved which impeded grain boundaries motion making the grain size almost not changed in the process of ho- mogenization. The optimum homogenization condition was 545 ℃/16 h. The tensile strength increased, yield strength decreased and the plasticity improved obviously after 545 ℃/16 h homogenization treatment.     

PCBN刀具材料与现代加工技术

随着科技的不断发展,对一些更坚固、更轻、更耐磨材料的需求也在不断增加,在现代工业尤其是汽车工业及航天航空工业中,复合材料及耐磨有色金属材料被大量使用,而采用普通刀具加工这类材料却难以胜任。因此,超硬刀具材料PCBN应运而生。本文对PCBN刀具用于高速与超高速切削、硬态干式切削、在数控机床上加工淬火钢加工以及不同应用领域对PCBN刀具材料的要求均有描述。指出,为达到我国未来工业经济的高速发展,超硬刀具的成功应用是一个关键因素。     

立方氮化硼（cBN）的P—T平衡区（曲线）

晶体生长过程属于非平衡态过程。有关晶体生长的理论却是在平衡态基础上发展起来的,因而研究相平衡及相图对晶体生长有着直接重要意义。     

Effect of Gd content on microstructure and mechanical properties of Mg-Y-RE-Zr alloys

Four kinds of Mg-Y-RE-Zr alloys with different Gd contents were prepared,and the effect of Gd content on microstructure and mechanical properties of the alloys was researched.Based on the experimental investigation,the compounds at the grain boundaries are mainly Mg_(24)Y_5,Mg_(41)Nd_5,and Mg_5Gd phases.The average grain size of as-cast alloys is 50-60μm.After T4(535℃, 24 h)treatment,Mg_5Gd phases mostly decompose and dissolve into the matrix,and the disperse spotted phases are mainly Mg_(24)Y_5 and Mg_(...