Advanced exergetic analysis of a novel system for generating electricity and vaporizing liquefied natural gas

LNG technology has been in use since the 1960s. During the last 20 years the total cost of LNG technology has decreased by 30% due mainly to improvements of the liquefaction process and shipping. However, the regasification system has not been significantly improved. The paper presents a detailed advanced exergetic analysis of a novel co-generation concept that combines LNG regasification with the generation of electricity. The analysis includes splitting the exergy destruction within each component into its unavoidable, avoidable, endogenous and exogenous parts as well as a detailed splitting of the avoidable exogenous exergy destruction. The results of the advanced exergetic analysis are confirmed through a sensitivity analysis. Finally, some suggestions for improving the overall system efficiency are developed.     

Performance evaluation of an integrated hydrogen production system with LNG cold energy utilization

This study aims to develop a novel integrated geothermal based system by the application of different thermodynamic cycles such as Kalina, liquefied natural gas (LNG), Stirling and proton exchange membrane electrolyzer (PEME) to produce cooling, hydrogen, and electricity. Energy and exergy analyses of the system are performed to evaluate the performance of the system. Additionally, the effects of five different input variables are investigated to determine their impacts on the corresponding values of net power and cooling, exergy efficiency, hydrogen production, and sustainability index. In a defined condition, the exergy efficiency of the suggested system is computed around 43%. The cycle net generated power is 10.69 MW, which is the generated power by the Stirling, LNG, and Kalina turbines each by 8.07 MW, 1.13 MW, and 1.49 MW, respectively. The produced cooling load by the cooling unit of the LNG stream is also 6.09 MW, while the rate of hydrogen production in the electrolyzer is 204.77 kg/h by consuming all the generated power. Additionally, a sensitivity analysis is performed to study the effects of each design parameters on the system performance.     

基于高压缩比的降低天然气发动机气耗研究

针对目前气体发动机气耗偏高、经济性差的现状,本文基于一台10L采用混合进气的LNG发动机研究了高压缩比下发动机气耗。研究结果表明,通过GT-POWER仿真分析,提高压缩比可以在整机的全部常用工况内实现降低气耗。     

利用液化天然气冷能的新型空分流程及其性能

为了有效利用液化天然气（LNG）因处于低温位而含有高品质的可用能，提出了一种利用LNG冷能的新型空分流程，以期回收LNG冷能的同时降低空分系统的动力功耗.从热力学角度出发，指出了该LNG冷能回收利用方式的合理性.在详细介绍该流程的组织方式的基础上，着重探讨了流程在安全性、运行压力、调节灵活性和单位能耗等方面的特点.对一氧气产量为10 000 m3/h的流程算例进行了模拟分析，结果表明，该LNG冷能冷却空分流程单位液氧产量的耗电量约为0.4 kW·h/kg，远低于传统空分流程约为1.0 kW·h/kg的耗电量.     

基于无线通信的LNG气瓶液位监测系统设计

液化天然气(LNG)是目前公认的一种清洁能源,以LNG为燃料的汽车已投入使用;LNG车载气瓶是LNGV车载燃料汽车动力系统的核心部分,为保证车载气瓶使用过程中的安全性,需实时监控LNG气瓶液位参数,故设计一种基于无线通信的LNG气瓶液位监测系统;系统利用电容式液位传感器对液位对象进行测量,通过无线通信技术将数据进行传输,选用STM32单片机作为中央处理单元,完成对数据的处理与判读,达到LNG车载气瓶液位监测工作要求;经反复验证,系统运行可靠且测量误差不超过1.5%,完全满足LNG气瓶液位监测要求。     

LNG储槽施工技术

上海的液化天然气应急事故备用站的LNG储槽是国内第一座冷冻液化气储槽，文章介绍了该储槽的施工技术，并总结了施工中的经验和教训。     

天然气的净化与液化工艺

介绍了液化天然气(LNG)的净化与生产和分子筛的应用。     

A summary of some experimental data on LNG safety

In a recent paper, Luketa-Hanlin reviewed the information in the public domain related to LNG safety. The purpose of this paper is to supplement that work by providing a summary of the experimental information that Advantica has collected on LNG behaviour over the course of the last 30 years. This summary includes previously unpublished information obtained as a result of a number of collaborative projects. Subjective comments are also made on the status of modelling for each of the topic areas and, in a discussion, views are provided on those areas where there are currently gaps that may have a major impact on evaluating the individual or societal risks associated with LNG operations.     

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。     

LNG储罐穹顶带钢板网壳施工全过程稳定性分析

为分析带钢板网壳在穹顶混凝土施工全过程期间的稳定性能与承载能力,利用ANSYS有限元分析软件建立精细化有限元模型,对其进行非线性荷载-位移全过程分析,利用能量误差方法评估并确定合理的单元网格划分尺寸,通过获取屈曲临界点处的屈曲模态形式,确定带钢板网壳的合理初始几何缺陷形式;探讨了蒙皮钢板对网壳稳定承载力的影响,以及钢板厚度、网壳杆件截面尺寸、矢跨比、初始几何缺陷等参数对带钢板网壳稳定性能的影响规律.分析结果表明:钢板蒙皮显著提高了网壳承载力;1/8~1/5矢跨比范围内,随矢跨比的增加,结构极限承载力最大增幅可达87.3%;带钢板网壳对初始几何缺陷具有高度敏感性.