浅析GE水煤浆气化装置检修要点

神华包头煤气化装置采用美国GE水煤浆气化工艺,7台气化炉,5开2备,是目前国内规模最大的煤气化装置。GE水煤浆气化炉为周期性运行反应炉,故其周期性检修对装置的长周期稳定运行至关重要。简述了GE水煤浆气化装置工艺流程;探讨和总结了装置各单元的检修要点。     

60万t/a甲醇项目GE水煤浆气化装置运行总结

兖州煤业榆林能化有限公司60万t/a甲醇项目气化装置采用GE水煤浆气化技术,气化炉2开1备。分析了装置运行过程中存在的问题及其原因;总结了相关整改措施及其效果。     

致力于特种材料的GE先进材料集团

介绍了新组建的GE先进材料公司的业务范围、发展战略,以及新开发的6种产品。     

Inhibition of the growth of human hepatoma cell line both in vitro and in vivo by transducing CKI gene p21WAF-1 with GE7 targeting gene delivery system

The EGF receptor-mediated targeting gene delivery system GE7 was used to transduce exogenous gene pCEP-p21WAF-1 into human hepatocellular carcinoma cell both in vitro and in vivo. After in vitro transduction of the exogenous gene, the growth of the cell lines SMMC-7721 and BEL-7402 was significantly inhibited compared with the control. On day 8 the inhibition rates of the above cell lines reached 56.0% and 66.7%, respectively. The in vivo experiment showed that the growth of human hepatoma transplanted in nude mice injected with GE7 gene delivery system subcutaneously once a week for 3 weeks was remarkably inhibited compared with that of untransfected control. The average tumor weight of the experiment group was (0.083 ± 0.043) g, while that of the control group was (0.281± 0.173) g. The difference is significant (P<0.05). It was indicated that GE7 gene delivery system could efficiently transduce exogenous gene pCEP-p21WAF-1 into hepatoma cell with high EGF receptor expression, and inhibit the cell growth with high efficacy both in vivo and in vitro.     

Condensation heat transfer with noncondensable gas for passive containment cooling of nuclear reactors

Noncondensable gases that come from the containment and the interaction of cladding and steam during a severe accident deteriorate a passive containment cooling system's performance by degrading the heat transfer capabilities of the condensers in passive containment cooling systems. This work contributes to the area of modeling condensation heat transfer with noncondensable gases in integral facilities. Previously existing correlations and models are for the through-flow of the mixture of steam and the noncondensable gases and this may not be applicable to passive containment cooling systems where there is no clear passage for the steam to escape. This work presents a condensation heat transfer model for the downward cocurrent flow of a steam/air mixture through a condenser tube, taking into account the atypical characteristics of the passive containment cooling system. An empirical model is developed that depends on the inlet conditions, including the mixture Reynolds number and noncondensable gas concentration.     

Advances in J‐integral estimation of circumferentially surface cracked pipes

This paper describes enhanced J‐integral estimation schemes for pipes with circumferential semi‐elliptical cracks subjected to tensile loading, global bending and internal pressure. These schemes are given in two different forms to cover the wide ranges of geometries and material parameters; the modified GE/EPRI method and the modified reference stress method. In the former method, new plastic influence functions for fully plastic J‐integral estimation are developed based on extensive three‐dimensional finite element calculations. In the latter method, new optimized reference loads are suggested and utilized to predict the J values. To verify the feasibility of these two schemes, J‐integral values obtained from further detailed FE analyses are compared to those from the proposed schemes. Because the estimated J‐integrals agree fairly well with the detailed FE analysis results, the new solutions can be applied for accurate structural integrity assessment of different size pipes with a circumferential surface crack.     

基于GE地图和KML脚本的CMMB路测分析系统开发

根据中国移动多媒体广播(CMMB)系统的路测数据需求,提出了一种基于GE地图和KML脚本的CMMB路测分析系统开发方法。介绍了该路测分析系统的组成模块、GE地图和KML脚本关键技术以及具体设计步骤,并对该系统进行了工程实用测试,系统能够准确分析和显示CMMB路测结果参数。     

通讯和网络在GE90-70PLC系统中的应用

文章介绍了GE90-70PLC系统中通讯和网络的分类及其应用,并详细讲述了每种通讯方式所支持的具体通讯协议及其特点。     

Modeling pressure suppression pool hydrodynamics in the ABWR containment

This paper focuses on the assessment of pressure suppression pool hydrodynamics in the advanced boiling water reactor (ABWR) containment under design-basis, loss-of-coolant accident (LOCA) conditions. The paper presents a mechanistic model for predicting various suppression pool hydrodynamics parameters. A phenomena identification and ranking table (PIRT) applicable to the ABWR containment pool hydrodynamics analysis is used as a basis for the development of the model. The highly ranked phenomena are represented by analytic equations or empirical correlations. The best estimate and several sensitivity calculations are performed for the ABWR containment using this model. Results of the sensitivity calculations are also presented that demonstrate the influence of key model parameters and assumptions on the pool hydrodynamics parameters. A comparison of model predictions to the results of the licensing analyses shows reasonable agreement. Comparison of the results of the proposed model to experimental data shows that the model predicted top vent clearance time, the pool swell height, and the bubble breakthrough elevation are within 10% of the data. The predicted pool surface velocity and the liquid slug thickness are within 30% of the measurements, which is considered adequate given the large uncertainties in the experimental measurements.     

IP和OTN联合组网技术探讨

针对目前IP骨干网组网方式存在的问题,本文对IP和OTN联合组网的相关技术进行了分析探讨,包括40GE/100GE&OTN接口的发展现状和设备支持情况、IP+OTN的联合保护策略以及路由器引入通道化接口和GMPLS的可行性等问题。