煤质对Texaco（GE）气化装置运行的影响及其选择

文中介绍了水煤浆加压气化适宜的煤种和Texaco煤气化工艺对煤质的要求及其选择适应性,分析了煤质对Texaco煤气化装置运行的影响。     

GE气化工艺高压黑水管线改造探讨

针对GE水煤浆气化普遍存在的激冷室至高压闪蒸罐,洗涤塔至高压闪蒸罐等高压管线的堵塞问题,分析原因,提出改进措施.     

Study of crystal structure and properties of poly(vinylidene fluoride)/graphene composite fibers

Poly(vinylidene fluoride) (PVDF) nascent composite fibers were prepared through the melt-spinning method with different graphene (GE) contents, following which post-stretched composite fibers were obtained using a post-stretching process under thermal treatment condition. The effects of GE content and post-stretching ratio on the crystal structure and properties of the fibers were investigated in order to obtain PVDF composite fibers with high β crystal content and high hydrophobicity and oleophilicity. The results indicated that the addition of GE led to some extent to an improvement in the content of β crystals and the orientation of crystals. Furthermore, the addition of GE obviously improved the mechanical properties, hydrophobicity and oleophilicity of nascent composite fibers. The post-stretching ratio had a significant influence on the transition of the crystal phase from α to β and the orientation of crystals. In addition, the post-stretching played a positive role in enhancement of mechanical properties and hydrophobicity. When 5 wt% GE was added and the post-stretching ratio was 6, PVDF composite fibers with high β crystal content, super-oleophilicity and high hydrophobicity could be obtained. The β crystal content of PVDF composite fibers could reach 62.8%, oil contact angle was 0° and water contact angle was 116.0°. © 2021 Society of Industrial Chemistry.     

Nonuniform Encoding and Hybrid Decoding Schemes for Equal Error Protection of Rateless Codes

Messages are generally selected with the same probability in the encoding scheme of rateless codes for equal error protection. In addition, a belief propagation (BP) decoding scheme is generally used because of the low computational complexity. However, the probability of recovering a new message by BP decoding is reduced if both the recovered and unrecovered messages are selected uniformly. Thus, more codeword symbols than expected are required for the perfect recovery of message symbols. Therefore, a new encoding scheme with a nonuniform selection of messages is proposed in this paper. In addition, a BP‐Gaussian elimination hybrid decoding scheme that complements the drawback of the BP decoding scheme is proposed. The performances of the proposed schemes are analyzed and compared with those of the conventional schemes.     

环秀山庄与戈裕良再认识 ——叠山匠师方惠眼中的环秀山庄假山技法

出自清代叠山家戈裕良之手的环秀山庄假山是中国最好的湖石假山之一,学界有很多研究成果.但扬州叠山匠师方惠认为,学界对环秀山庄和戈裕良的认识有许多似是而非的地方,并提出自己的看法.方惠认为把南面作为观赏环秀山庄的主大面是一个巨大的错误,是对观赏者的误导,真正的主大面是入山的问泉亭至补秋山房一线,从这一线观赏才能体会环秀山庄...     

电泳技术研究进展及应用

本文介绍了电泳技术的研究进展,描述了目前比较成熟的三种电泳技术：毛细管电泳、双向电泳和脉冲凝胶电泳及其原理和应用。     

Non‐varnishing and tribological characteristics of polyalkylene glycol‐based synthetic turbine fluid

Varnish build‐up in heavy duty gas turbines is a leading cause of costly unplanned shutdowns and resulting lost power generation capacity. The culprit is the conventional petroleum‐based turbine oil, which breaks down to form varnish and sludge that cause servo valves to stick. Use of filtration to remove solid degradation by‐products addresses a symptom but not the root cause of varnish formation: the petroleum‐based turbine oils themselves. For the best protection against varnish‐related shutdowns, a switch from petroleum‐based turbine oil to non‐varnishing polyalkylene glycol (PAG)‐based synthetic turbine fluid was undertaken by four power plants in North America. PAG‐based synthetic turbine fluid chemistry, its tribological characteristics and successful trials in GE 7FA heavy duty gas turbines (General Electric Company, Fairfield, CT, USA) are discussed in this paper. PAG‐based synthetic turbine fluid has outperformed the hydrocarbon turbine oil in reduced sludge and varnish formation due to its polar nature and solvating power in plant trials as well as in a modified ASTM D 2893 test. Copyright © 2011 John Wiley & Sons, Ltd.     

无烟煤在GE水煤浆气化装置的成功应用

对世界上首套以无烟煤为原料的金赤化工GE水煤浆气化装置所使用的原料煤煤质以及运行参数、性能指标进行分析,结果表明,气化炉产能、有效合成气成分、比煤耗、比氧耗等主要性能指标均优于设计值,无烟煤在本装置上的应用非常成功。     

ON THE SIMULTANEOUS REPRESENTATION OF VAPOR-LIQUID EQUILIBRIA AND EXCESS ENTHALPIES OF 1-ALKANOL + n-ALKANE MIXTURES

Simultaneous representation of vapor-liquid equilibria and excess enthalpies for l-alkanol + n-alkane mixtures has been investigated by means or the PRSV equation of state together with the Wong-Sandier mixing rule. Special attention has been paid on the mixtures of methanol and n-hexane. The results are influenced not only by the selection of a suitable excess Gibbs energy model incorporated in the mixing rule but also by the weighting factors used in the objective function for the evaluation of parameters.     

GE MOST紧急停车系统在300kt/a尿素装置的应用

介绍GE MOST紧急停车系统在柳州化工股份有限公司300 kt/a尿素装置上的应用情况,详细阐述了GE MOST系统的硬件配置、软件功能和主要控制回路逻辑。