共查询到16条相似文献,搜索用时 93 毫秒
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分析了国内LNG汽车发展状况,以410 l公交车用LNG燃料罐为例,进行内部介质热力过程分析,计算得到了燃料罐内压力变化曲线。 相似文献
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针对城市天然气高中压管网调压站的压力能回收利用,综合考虑LNG储运过程中广泛面临的BOG(Boiloff gas)问题,提出了一种结合混合工质循环、利用天然气压力能生产高品质LNG的小型液化流程。研究分析了预冷温度、动部件效率、低温换热器性能及液化天然气温度对流程天然气液化比的影响,优化的流程结果参数表明,当所得液化天然气储存在4bar,-160℃时,流入系统18.26%的天然气可被液化,其余部分外输中压管网;提出了在LNG买卖市场中根据LNG品质议价的建议,以从根本上减少LNG储运、装卸及使用过程的BOG排放量,进而减少经济损失与能源浪费。该流程可应用于城市燃气调峰,也可进行二次销售,具有较好实用性和经济性。 相似文献
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液化是天然气利用的一种重要形式,在天然气消费中占有重要地位,天然气超音速液化技术是一种新型的天然气液化手段。为研究低温条件下天然气超音速凝结过程,特设计用于天然气超音速液化的Laval喷管,采用内部一致经典成核理论及Gyarmathy模型计算成核率及液滴生长率,在入口压力6 MPa、温度273.15 K的工况下,通过Fluent软件数值模拟了天然气超音速液化过程中主要参数在Laval喷管内的分布情况。结果表明:天然气进入Laval喷管后压力、温度不断降低(最低压力0.796 MPa,最低温度191 K),与等熵(无凝结)流动相比,天然气在Laval喷管喉部之后的一段距离饱和度增大到一定值时,由于释放潜热对气流的加热作用,压力开始升高,天然气产生凝结冲波现象,极限成核率为2.60×10~(21)/(kg·s);随着凝结潜热的释放,成核率急剧变为0;凝结核生成后伴随着液滴的继续生长,在Laval喷管出口处天然气凝结的液滴半径为3.90×10~(-7) m,液滴数目为7.42×10~(14)/m~3,液相质量分数达0.232,取得了良好效果。 相似文献
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蓄压型液舱用于沿海LNG运输的研究 总被引:1,自引:0,他引:1
提出了解决沿海液化天然气运输的一种方案。针对小型LNG船的关键设备蓄压型独立液舱存储液化天然气,进行了理论计算和模拟试验,并对影响液舱压力和运输时间的主要因素进行了研究分析。对LNG运输的时间进行预测,论证了该种小型LNG船在近海或沿海运输的可行性,为开发用于近海运输的小型LNG船,提供了理论依据。 相似文献
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国内外液化天然气输运容器发展状态 总被引:3,自引:0,他引:3
液化天然气输运容器包括罐箱、罐车和车载储气瓶,普遍采用高真空多层绝热方式是国际发展趋势,其合理应用需要多项关键技术.由于产品种类型号相对较少,适合批量化生产以适应液化天然气工业的迅猛发展.液化天燃气输运容器产品发展趋势和技术发展趋势可为我国低温储运容器生产厂家提供一定的参考. 相似文献
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Will O. Landsberg Tristan Vanyai Timothy J. McIntyre Ananthanarayanan Veeraragavan 《Proceedings of the Combustion Institute》2021,38(3):3835-3843
This paper examines the scram/dual-mode combustion limits of hydrocabon fuels within a Mach 8, scramjet combustor. Flight-equivalent flows were delivered to the axisymmetric, cavity combustor via a reflected shock tunnel. Two scramjet fuels were examined: ethylene and a surrogate mixture representing endothermically cracked n-dodecane. Combustion modes were examined via static pressure sensors and through both chemiluminescence imaging, and planar laser induced fluorescence (PLIF) of the OH combustion radical in the combustor exhaust plume. Ethylene-fuelled experiments developed scram-mode combustion under reduced fuelling conditions, experiencing shock wave dominated flowfields. OH PLIF diagnostics indicated such combustion modes developed a ring-like structure of combustion products, primarily axisymmetrically adjacent to the combustor wall. Increased fuelling anchored combustion downstream of the fuel injector, while further increases instigated dual-mode combustion. In this mode, subsonic combustion regions combine with the supersonic coreflow to permit the transfer of information upstream with substantially increased pressure encountered. Optical diagnostics indicate broadly asymmetric, unsteady combustion features. The surrogate mixture representing endothermically cracked n-dodecane experienced rapid onset from no-combustion (optically confirmed) to fully developed dual-mode combustion at critical fuelling rates. OH PLIF signals and chemiluminescence of this fuel were weaker than comparable ethylene cases, indicating potential differences in combustion pathways. 相似文献
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A. A. Glazunov V. D. Goldin V. G. Zverev S. N. Ustinov V. S. Finchenko 《Thermophysics and Aeromechanics》2013,20(2):195-209
The engineering calculation method has been developed for investigation of the process of thermal destruction of “Fregat” upper stage at deorbiting and descent into the Earth’s atmosphere. The results of calculation of its descent trajectory and characteristics of aerodynamic heating are presented. Within the framework of the thermodynamic approach, the authors investigated the process of pressure increase in the tanks due to heating and evaporation of the liquid phase of fuel. Stresses in the shells, the height and the energy equivalent of explosive destruction of tanks were calculated depending on the degree of their filling with remains of the components of liquid fuel. 相似文献
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液舱晃荡引起的载荷己成为航行中载液船舶安全性评估的重要内容之一、以及船舶结构动力学的一个热点.文中首先运用VOF法建立LNG晃荡液舱模型,给出对LNG液舱晃荡特性数值模拟方法,运用模拟结果讨论不同工况(如装载率、频率、横摇角度幅值)下晃荡动压特性,在此基础上给出了LNG液舱的晃荡载荷特性与抑制晃荡的措施. 相似文献