KDON-100/300(20Y)型空分设备流程特点分析

简介KDON-100/300(20Y)型空分设备的工艺流程组织和设备配置,详细分析空分设备的流程特点,阐述实际运行情况及改进建议。     

KDONAr-4200Y／1700Y／145Y型全液体空分设备调试运行总结

横山气体公司新建的KDONAr-4200Y／1700Y／145Y型全液体空分设备开机调试后,分阶段整改存在的问题,使运行工况不断优化,产品达标。文章简介全液体空分设备流程和主要参数,详述了设备调试过程中遇到的主要问题,并提出相应的解决方案。     

KDON-400Y/400Y型空分设备投产总结

文章介绍了全低压流程KDON - 4 0 0Y/ 4 0 0Y型空分设备的工艺流程、设计参数、联机调试和考核结构 ;并对投产中存在的主要问题提出了改进的方法。     

KDON-400Y/400Y型空分设备循环气系统带水的分析及处理

分析了KDON - 40 0Y/ 4 0 0Y型空分设备循环气系统带水的原因 ,对流程部分进行了相应改进 ,采用了新的加热工艺 ,使问题得到圆满解决     

KZON—100/500-30Y型空分设备开车成功

<正> 由哈尔滨制氧机厂提供北京电予管厂的KZON－100／50030Y型空分设备，于1990年3月23间一次开 车戍功。经运行测试表四，该设各主耍指标达到或超过设计值：     

KDON-1500Y/1500Y型液体设备开发和运行

简介了已投入运行的石家庄京联KDON 15 0 0Y/ 15 0 0Y型液体设备的工艺流程和主要性能指标 ,详细介绍了设备配套情况和运行情况 ,并分析了其优点。     

KDO-80Y型空分设备工艺流程、操作要点及常见故障排除

简要介绍了KDO-80Y型空分设备的工艺流程特点,叙述了KDO-80Y型空分设备操作要点,列举了KDO-80Y型空分设备常见故障分析及排除方法。     

有关全液体空分设备开车操作的探讨

介绍了华东气体公司的KDONAr 2 0 0 0Y/ 370 0Y/ 70Y型空气分离设备流程特点 ,总结分析该设备开车中出现的问题 ,并以此为例探讨全液体空分设备开车的操作特点     

中大型低温液体产品空分设备开发初探

介绍了开发KDON—3000Y/7000Y型低温液体产品空分设备的必要性、可行性和流程组织。图1。     

100标米~3/时高纯压力氮设备

本文介绍了邯郸制氧机厂设计试制的100标米~3/时高纯压力氮设备的流程、特点、主要设计参数、操作以及运转情况。实践表明,该设备流程还是比较先进的,氮气提取率与国内外同类型产品比较也是比较高的,所制得的高纯氮含氧量可达4ppm,产量也达到设计要求。图1,表1。     

纳米Y_2O_3:Eu~(3+)(Y_2O_3)粉体的红外光谱研究

采用均相沉淀法和燃烧合成法制备了不同粒径的粉体材料Y2O3:Eu3+,着重研究了样品的红外光谱,探讨了纳米晶Y2O3:Eu3+与同质微米材料相比的微观结构的变化.研究发现,波数位于563 cm-1的Y(Eu)—O键的吸收峰校正高度和面积对于纳米级粒径的粉体材料随着颗粒的减小而减小,而对于同质微米材料却相反.经分析认为:Y(Eu)—O键的吸收峰校正高度和面积由Y(Eu)—O键的平均键长和Y(Eu)—O键振动态数目这两个因素决定.对于微米粉体Y(Eu)—O键长的变化起主要作用,而对于纳米粉体由于不饱和键和悬空键的形成,Y(Eu)—O键振动态数目的变化起主要作用.     

Role of Y4Al2O9 in High Temperature Oxidation Resistance of NiCoCrAlY-ZrO2.Y2O3 Coatings

NiCoCrAlY-ZrO2·Y2O3 coatings were deposited on the substrates by using a technology of combining electron,atom and ion beams （three beams）. Isothermal oxidation for these samples was performed at 1100℃ for 100-300 h. The results show that a thermally grown oxide （TGO） layer was formed between NiCoCrAlY layer and oxidation. The TGO contains α-Al2O3 and Y4Al2O9 etc. oxides. The intensity ratio of α-Al2O3/Y4Al2O9 was monotonously decreased with increasing oxidation time based on XRD （X-ray diffraction） analysis. The Y4Al2O9 phase plays the most important role in high temperature oxidation resistance at 1100℃. The related mechanism was also discussed.     

Fabrication of photoluminescent S doped Y2O3:Eu3+ nanobelts

We have successfully fabricated the S doped Y(OH)3 nanobelts with 15-30 microm in length and 50-300 nm in width and S doped Y(OH)3:Eu3+ nanobelts with 4-15 microm in length and 80-500 nm in width (most between 100 and 200 nm) via a similar process for preparation of Y(OH)3 nanotubes. Photoluminescent (PL) nanobelts of S doped Y2O3:Eu3+ were obtained through dehydration of the S doped Y(OH)3:Eu3+ nanobelts at 450 degrees C in N2. The PL properties of the S doped Y2O3:Eu3+ nanobelts have been studied and evidenced that we have successfully synthesized functional S doped Y2O3:Eu3+ nanobelts with interesting photoluminescence properties.     

Y2O3:Eu3+ core-in-multi-hollow microspheres: facile synthesis and luminescence properties

Y2O3:Eu3+ core-in-multi-hollow microspheres were synthesized via a facile hydrothermal method in the presence of glucose followed by a subsequent heat-treatment process. X-ray diffraction (XRD) pattern shows that the as-obtained hollow spheres are cubic phase of Y2O3. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) images indicate that the samples are three layer hollow spheres with a diameter of 2-4 microm and the outermost wall thickness of 100 nm, the size of the inner core is about 300-400 nm, and the sub-outer wall thickness is about 100 nm. X-ray energy dispersive spectrum (EDS) shows that the samples are composed of Y, Eu and O. Photoluminescence spectra show that the hollow spheres have a strong characteristic red emission corresponding to the 5D0 - 7F2 transition of Eu3+ ions under ultraviolet excitation. This method can be used to synthesize other rare earth oxide hollow luminescent materials.     

Experimental research on residual carbon of Y211 inclusions in a melt-textured Y123/Y211 composite

The inherent doping of residual carbon during the preparation of Y₂BaCuO₅ (Y211) inclusions would degrade the physical and mechanical performance of the Y₁Ba₂Cu₃O_7-x (Y123) superconducting matrix. Y211 precursor powders were prepared by the oxalate coprecipitation process in this study. Residual carbon contents of Y211 powders under different heat treatment processes were studied by the high-frequency combustion infrared absorption method. The residual carbon content of Y211 reached the current best level ～0.012% when calcined in O₂ flow at 950°C for 20?h. Y211 powders with the lowest carbon content were used to prepare a small batch of melt-textured Y123/Y211 composites. All samples were single-domain crystals without macro defects, which were usually caused by the emission of CO₂. Among them, one sample (Ø27?mm?×?14?mm) has a maximum levitation force of 71?N (77?K, 0.5?T), with critical current density J_c of 3.2?×?10⁸ A/m² (77?K, 0?T).     

Enhanced cracking activity of dealuminated Y zeolites

Cumene cracking has been studied over HY and over dealuminated Y zeolites prepared by combined silicon tetrachloride and mineral acid treatment. At 500 K, the rates of formation of propene and benzene over dealuminated zeolites were up to 100 times greater than those observed for HY zeolites of comparable proton content. The activity of HY zeolites at 640 K decayed rapidly with time-on-stream, while that of dealuminated zeolites remained effectively unchanged over a period of 10 hours. The diminished coke formation over the latter was confirmed by carbon analysis of used cataysts.     

微波均相沉淀法制备Ce:(Y,Gd)_3Al_5O_(12)荧光粉

以Y2O3,Gd2O3,Ce(NO3)3·6H2O,Al(NO3)3·9H2O为原料,采用微波均相沉淀法制备了Ce:(Y,Gd)3Al5O12前驱体,经1100℃煅烧得到粒径在100nm左右的近球形粉体。测试结果表明:该粉具有良好的荧光性能,呈现宽带激发和宽带发射,激发主峰在456nm,半高宽约为60nm,在460nm入射光的激发下,发射峰在566nm左右,半高宽约为125nm。由于Gd3+的掺入改变了基体的晶场结构,致使发射光谱发生了红移。     

Formation of nano-sized Y2O3 dispersoids in mechanically alloyed Ni-(Cr, Y2O3, Y) alloys during heat-treatments

In the present work, the evolution of nanoparticles during annealing and hot-consolidation in mechanically alloyed Ni-22Cr-1.5Y, Ni-22Cr-1.5Y2O3 and Ni-3% Y2O3 was examined. The high-energy ball-milling of elemental powders resulted in the complete dissolution of the constituent Cr, Y, or Y2O3, forming a Ni-based solid solution. During the subsequent annealing, however, oxide particles precipitated from the solid solution. In the case of mechanically alloyed Ni-22Cr-1.5Y2O3, over-grown Cr2O3 precipitated at a temperature as low as above approximately 500 degrees C and ternary YCrO3 particles precipitated at 1100 degrees C. In the case of mechanically alloyed Ni-22Cr-1.5Y, on the other hand, the binary Y2O3 phase precipitated at 1100 degrees C during spark plasma sintering. The presence of Cr in the alloy composition facilitated the formation of Cr2O3 or YCrO3, and the precipitated oxides were highly prone to grain growth during hot-consolidation, sometimes reaching several micrometers. In Cr-exempt Ni-3%Y or Ni-3% Y2O3, however, the growth of nanodispersoids was restrained even at temperatures as high as 1000 degrees C and the resulting dispersoid was only nano-sized Y2O3.