涟钢22000m3／h空分设备自动化控制系统的设计与应用

涟钢22000m3／h空分设备,由杭氧制造。此项目于2005年5月投产,各项运行指标正常。22000m3／h空分设备的自动化控制采用了霍尼韦尔公司的PKS C200系统。自动化设计及控制范围广泛,包括循环水系统、原料空气过滤系统、空压机系统、空气预冷系统、分子筛纯化系统、增压膨胀机系统、精馏塔系统、氧压机系统、氮压机系统、贮槽及加压汽化系统。整个空分设备全部由DCS系统控制,完全实现了中央控制室的集中控制,其工艺流程如图l。     

20000 m3/h内压缩制氧机组液氧泵密封气系统改造

1前言马钢气体分公司2004年新建一套20000 m3/h制氧机组,空分设备由杭氧提供,为全精馏内压缩流程。其配套的CDS2/298/2684.5L-3.1-WB VC-C/O型产品液氧泵由CRYOSTAR提供。在设备运转过程中,液氧泵出现多次因密封气问题造成跳车以至空分系统跳车事故。经过密封气系统的改造,现泵运转正常,再也没发生类似事故。     

武钢10000 m3/h制氧机下塔二氧化碳堵塞故障分析及处理

分析了武钢氧气公司D台(10000 m3/h)制氧机改造后采用分子筛流程空分设备在保冷后,下塔出现二氧化碳堵塞故障的原因,论述了故障处理的方法以及预防的措施。     

豫光10000Nm~3/h空分设备配置特点与安装调试

根据豫光金铅股份有限公司制氧厂10000 m3/h空分设备的产品指标和流程配置特点,详细分析空分设备各系统自试生产以来出现的问题,并提出解决方法;改造后保证了空分设备的正常、稳定运行。     

KDON4500/4500型空分增容改造的实践

马钢(合钢)动力厂KDON4500m3/h型空分设备为板式自清除工艺,通过相应的改造措施,使空分的产品产量得以提高,尤其是氮气产量,取得了显著的经济效益。     

40000m~3/h制氧机污氮气的开发利用

现有2套40000 m3/h制氧机氮气设计生产能力只有40000 m3/h,不能满足八钢新一轮发展的需要;采取从空分污氮气中抽取20000 m3/h作为产品氮气输出,解决了生产供应的矛盾。     

28000 m3/h空分装置试车及冷备操作总结

简述了大唐公司28000 m3/h空分装置在试车过程中出现的问题,有上塔安全阀泄漏、液氮泵出口安全阀泄漏导致主冷液面降低、空冷塔和水冷塔液位测量不准及液氮泵密封气管路的改造。同时也描述了空分装置在冷备时需注意的问题和冷备时快速启动的方法。     

KDON-3200/3200-Ⅵ空气分离设备的使用与改进

KDON-3200/3200-VI空气分离设备运行中出现空气出空冷塔压力变送器测点冷凝水结冰,直接导致压力显示过低连锁停车,通过对空气出空冷塔压力变送器测点改造,解决了问题。对空气分离设备进行了改进,使制氧能力由3 200 m~3/h提高到3 700 m~3/h,电单耗由0.63 kWh/m~3降低到0.59kWh/m~3。将分离出来的氮气用到磷酸铁锂项目和精炼炉喷吹还原剂还原,使资源得到充分利用。强化分馏塔和DH45-12离心压缩机维修保养,使其安全可靠运行。     

20000m~3/h空分设备电控仪控系统故障处理措施

针对马钢20000 m3/h空分设备在电控仪控系统故障时存在问题,采用针对性空分设备操作方法与改进完善空分设备相关电控仪控系统,保证设备安全稳定。文章介绍了20000 m3/h空分设备在高压电网波动、膨胀机油泵电控故障、分子筛吸附器电加热器故障、DCS系统失电故障、液氧泵误跳机、电磁阀故障时现象,阐述了采取的处理措施及效果。     

金昌冶炼厂制氧空分设备改造效果浅析

分析制氧空分系统板式切换流程的缺点和分子筛的优点 ,介绍金昌冶炼厂制氧空分设备的可逆切换板式流程改造为分子筛流程后 ,生产运行状况 ;制氧工况较稳定 ;粗铜、硫酸产量增长 ;焦耗、电耗降低 ;改善制氧指标 ,提高了经济效益 ,改善了环境。     

Effect of metal doping into Ce0.5Zr0.5O2 on catalytic activity of MnOx/Ce0.5–xZr0.5–xM0.2xOy/Al2O3 for benzene combustion

The research investigated the effect of doping two metals separately or together into Ce0.5Zr0.5O2 on the catalytic activity of MnOx/Ce0.5-xZr0.5-xM0.2xOy/Al2O3 （M=Y, Mn, Y and Mn） for catalytic combustion of benzene. The prepared catalysts were characterized by X-ray diffraction （XRD）, surface area analysis, oxygen storage capacity （OSC）, and H2-temperature programmed reduction （H2-TPR）. Catalytic test was performed on a conventional fixed bed flow reactor. The characterization results revealed that Y and Mn ions entered into the ceria-zirconia mixed oxides framework, which improved the textural properties and greatly promoted the MnOx dispersion on the support surface. The complete conversion temperature of benzene on MnOx/Ce0.4Zr0.4Y0.1Mn0.1Oy/Al2O3 was 563 K, and the selectivity of carbon dioxides was 99%. This catalyst could be applied in a wide range of GHSV and wide concentration condition, showing great potential for application.     

Effect of Zn Doping on Transport Properties of La2/3 Sr1/3 Mn1 - x Znx O3 Films

La2/3 Sr1/3 Mn1-x ZnxO3films （x =0.05, 0.1,0.3, and 0.5） were prepared using magnetron sputtering method, and the effect of Zn doping on transport properties of the films was studied. An analysis of X-ray diffraction showed that the main phase of the bulk target was orthorhombic and the films had better epitaxial character. It was found that the films with x =0.05 and x =0.1 exhibited typical insulator-metal transition. No transition of the films with x≥0.3 was observed and the dominant transport was variable-range hopping due to observable secondary phase ZnO. These could be attributed to the Zn doping effect on manganites.     

锂过量对钙钛矿型Li3/8Sr7/16Ta3/4Hf1/4O3固体电解质性能的影响

固相烧结法合成钙钛矿型Li_3/8Sr_7/16Ta_3/4Hf_1/4O₃(LSTH) 固体电解质材料,制备过程中分别加入过量的碳酸锂,质量分数分别为(0~30 %).通过XRD、SEM、ICP-OES以及EIS测试,表征不同锂过量LSTH固体电解质材料成相、显微形貌以及室温电导率的影响.实验结果表明,配料时,过量一定质量百分数的碳酸锂,能够有效减少烧结过程中因锂挥发而生成的SrTa₂O₆杂相,提高样品密度和室温电导率.样品最佳锂过量质量百分数为20 %,20 %锂过量样品1 300 ℃烧结10 h为钙钛矿纯相,密度6.5 g/cm3,室温电导率达到3.12×10-4 S/cm.      

LiNi1/3Co1/3Mn1/3O2正极材料的合成与性能

采用共沉淀-高温固相法制备LiNi_1/3Mn_1/3Co_1/3O₂正极材料,利用XRD和SEM对所制试样的晶体结构和形貌进行表征,研究了烧结温度对材料电化学性能的影响.结果表明,焙烧温度为850 ℃制备的材料具有较好电化学性能,在25 ℃,电压范围为2.75~4.2 V,1 C充电6 C放电下首次放电比容量为124.2 mAh/g,50次循环后容量保持率为95.2 %.      

热压烧结制备Li3/8Sr7/16Ta3/4Hf1/4O3钙钛矿型固体电解质

采用热压烧结制备了Li_3/8Sr_7/16Ta_3/4Hf_1/4O₃钙钛矿型固体电解质, 研究了不同烧结方式对样品性能的影响。通过X射线衍射仪表征材料的晶体结构, 扫描电子显微镜观察组织形貌, 交流阻抗仪测试电化学性能。结果表明:样品为立方KTaO₃相, 热压烧结成功合成了钙钛矿结构固体电解质, 相对于常压烧结, 热压烧结制备的样品孔隙更少, 晶粒之间结合更加紧密, 致密度高达94.0%, 离子电导率为4.33×10-4S·cm(T=298K).      

Effects of La2O3/Li2O/TiO2- Coating on Electrochemical Performance of LiCoO2 Cathode

Conventional cathode material （LiCoO2） was modified by coating with a thin layer of La2O3/Li2O/TiO2 for improving its performance for lithium ion battery. The morphology and structure of the modified cathode material was characterized by SEM, XRD, and Auger electron spectroscopy. The performance of the cells with the modified cathode material was examined, including the cycling stability, the diffusion coefficient under different voltages, and the C-rate discharge. The results showed that the cell composed of the coated cathode material discharged at a large current density, and possesses a stable cycle performance in the range from 3.0 to 4.4 V. It was explained that the rate of Li ion diffusion increased in the cell while using La2O3/Li2O/TiO2-coated LiCoO2 as the cathode and the coating layer may act as a faster ion conductor （La2O3/Li2O/TiO2）.     

Antigenic drift between the haemagglutinin of the Hong Kong influenza strains A/Aichi/2/68 and A/Victoria/3/75

A DNA copy of the gene coding for the influenza A/Aichi/2/68 haemagglutinin protein was cloned in the plasmid pBR322 and the complete nucleotide sequence determined. Comparison of this primary structure and the deduced amino acid sequence with the haemagglutinin gene and protein of strains belonging to the same (H3) subtype and to different subtypes, of both human (H2) and avian (Hav1) origin, documents further at the molecular level the two independent modes of antigenic variation of the virus--drift and shift.