Hydrogen production by steam reforming of liquefied natural gas (LNG) over mesoporous nickel–phosphorus–alumina aerogel catalyst

A mesoporous nickel–phosphorus–alumina aerogel catalyst (NPAA) was prepared by a single-step epoxide-driven sol–gel method and a subsequent supercritical CO₂ drying method for use in the hydrogen production by steam reforming of liquefied natural gas (LNG). In order to investigate the effect of drying method of nickel–phosphorus–alumina catalysts on their physicochemical properties and catalytic activities, a mesoporous nickel–phosphorus–alumina xerogel catalyst (NPAX) was also prepared by a single-step epoxide-driven sol–gel method and a subsequent evaporative drying method for comparison purpose. It was found that supercritical CO₂ drying method was effective for enhancing textural properties of NPAA catalyst. Although both NPAX and NPAA catalysts retained surface nickel aluminate phase, NPAA catalyst showed stronger metal-support interaction than NPAX catalyst. XRD patterns of reduced NPAX and NPAA catalysts revealed that NPAA catalyst retained smaller metallic nickel crystallite than NPAX catalysts. It was also observed that the reduced NPAA catalyst exhibited high nickel dispersion, large amount of strong hydrogen-binding sites, and large amount of methane adsorption compared to the reduced NPAX catalyst. In the steam reforming of LNG, NPAA catalyst with high affinity toward methane showed a better catalytic performance than NPAX catalyst.     

LNG储罐用节镍低温钢焊接接头组织与低温性能

可替代9％Ni钢的节镍型低温钢已经成为LNG储罐用钢的重要发展方向,其焊接性和接头低温性能广受关注.针对20 mm厚LNG储罐用7％Ni钢的SMAW接头,进行微观组织观察和低温力学性能测试.试验发现,Cr、Mo元素含量的增加并没有对节镍钢的焊接性产生显著影响,焊缝成形良好,焊缝金属具有较好的强度和低温韧性,一次热循环粗...     

Optimum Silane Treatment for the Adhesively Bonded Aluminum Adherends at the Cryogenic Temperature

Aluminum adherends for the adhesive joints at cryogenic application such as LNG (Liquefied Natural Gas) containment tanks were silane treated to improve bond strength of the aluminum joints. The bond strengths of the single-lap joints composed of aluminum adherends and epoxy adhesive were measured with respect to the condition of the silane solution and surface roughness obtained with grit blast. The chemical composition of the silane treated aluminum surface was analyzed by XPS (X-ray photoelectron spectroscopy). Also, contact angles of appropriate liquids on the silane treated aluminum surface were measured with respect to treatment conditions. From the experiments, the optimum treatment conditions for the aluminum adherends were obtained for the adhesive joints at the cryogenic temperature.     

含氧煤层气制LNG产品中含氧量讨论

对含氧煤层气进行直接深冷液化可回收其中的甲烷生产LNG,减少污染排放.产品LNG中主要杂质为氧气,氧气含量对LNG产品的安全性有影响.通过对热量吸入和压力变化导致LNG部分气化的安全性进行分析,得出结论在LNG刚开始气化时气相中氧气浓度最高,并随着气化量增加而减小,LNG产品中氧含量应小于5％.     

高桩式LNG全容罐的地震作用计算

本文以弹性嵌固模型模拟地面以下的桩土相互作用及以Housner理论建立的附加质量模型模拟内罐的液固耦合作用为基础建立了高桩式LNG全容罐的地震作用计算模型。以实际工程为例,建立了三维有限元模型,对LNG储罐在空罐和满罐这两种状态进行了OBE、SSE地震作用下的反应谱分析,然后根据荷载组合得到了桩顶的最不利组合结果。     

30×10~4 m~3 LNG冷箱跑冷损失的计算

采用类比法、数学模型法、有限元法三种方法对30×104 m3 LNG冷箱的跑冷损失进行计算,并对计算结果进行了比较。经过比较,利用与空分设备类比的计算方法,计算LNG冷箱的跑冷损失,可以得到可靠的结果,这也与两者的工作温度接近的事实相符。     

船舶LNG燃料制氢及利用技术方案

基于LNG重整制氢技术的工艺特点和典型船舶动力装置配置方式,分析计算在不同氢能应用方式和制氢比例条件下的碳减排特性。计算结果表明将LNG制氢技术进行实船化应用可以满足国际海事组织对于船舶中长期的碳减排要求,是一种有效的降低船舶CO₂排放的技术措施。讨论该技术实船应用面临的问题和挑战,为LNG制氢技术的在船应用研究提供参考。     

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本文介绍了我国首例海上小规模液化天然气１２００ｍ＾３试验槽船及其配套的ＬＮＧ储存系统船槽采用与船体配合好、且能满足压无损运输要求的圆筒形式储槽；岸上采用结构简单，制造安装方便，具有较高经济性的常压立式储槽；海上平台采用了具有良好抗风流和抗颠簸性能，承压性优，冷损耗低的球形储槽；对工艺流程，设计结构、绝热方式，安全监测及防护系统，汽化及卸货等进行了探讨；分析了当前我国在低温变化，低温储运、制造技术已     

广州地区引进液化天然气的前景分析

天然气作为一种清洁能源，具有良好的燃烧特性，用途非常广泛，消费市场的发展潜力非常巨大，因此国家决定在广东省引进LNG（液化天然气），广州市也将因此直接受益。如果能够解决好市场定价的关键问题，无论在环保效益还是经济效益，LNG在广州地区的推广使用都具有广阔的前景，同时LNG的引直也为广州市的发电行业提供了新的发展机遇。为此，文章在这几个方面进行了详细的分析。     

催化燃烧式LNG传感器自校准技术的研究

为了提高催化燃烧式LNG传感器的测量精度和传感器工作寿命与稳定性,研发了新型的恒温检测电路,并在此基础之上进行了零点漂移和灵敏度自动校准技术的理论分析和实验研究。实验数据表明：该技术有效地解决了该类传感器长期存在的零点漂移与灵敏度下降的问题,为设计具有自动校准功能的可燃气体变送器提供了依据。