共查询到20条相似文献,搜索用时 78 毫秒
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阐述了液化天然气冷能炯的数学模型,并介绍了液化天然气冷能的几个应用领域,包括发电、空气分离、制取干冰、冷库和蓄冷装置。我国液化天然气的冷能利用潜力巨大。在兴建LNG接收站时,应当重视采用LNG冷能利用技术。 相似文献
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本文主要探讨了LNG汽车尾气余热和冷能回收的温差发电的研究。从汽车发动机尾气余热温差发电的原理出发,探讨了温差发电材料及其模块,最后探讨了温差发电装置的组成及其工作原理。 相似文献
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随着国民经济的高速发展,天然气作为一种优质清洁能源,正迅速的被开发利用。以船运方式进口LNG在沿海各LNG接收站卸货登陆,再通过气化器气化后进人各终端用户已成为我国天然气利用的主要方式之一。LNG汽化时释放出大量的冷量,而这部分冷量通常在天然气汽化过程中随海水或空气被合弃,造成了能源的极度浪费。本文主要介绍通过特定技术在多领域将冷能进行回收利用,从而达到节能降耗、绿色环保的目的。 相似文献
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《低温学》2017
A theoretical investigation to optimize thermoelectric modules, which convert LNG cold energy into electrical power, is performed using a novel one-dimensional analytic model. In the model the optimum thermoelement length and external load resistance, which maximize the energy conversion ratio, are determined by the heat supplied to the cold heat reservoir, the hot and cold side temperatures, the thermal and electrical contact resistances and the properties of thermoelectric materials. The effects of the thermal and electrical contact resistances and the heat supplied to the cold heat reservoir on the maximum energy conversion ratio, the optimum thermoelement length and the optimum external load resistance are shown. 相似文献
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采用液化天然气(LNG)冷量的液体空分新流程及其(火用)分析 总被引:1,自引:0,他引:1
提出了2种采用液化天然气(LNG)冷量的新流程,并采用Aspen Plus对流程进行了模拟计算。空气循环膨胀制冷的液体空分流程采用LNG冷量代替了空气外循环制冷,简化了制冷系统,与原始流程相比,液态产品的单位能耗降低约49%;氮气循环膨胀制冷的液体空分流程采用LNG冷量代替了高压氮气外循环制冷,系统所需循环氮气量减少,最高运行压力从4.6MPa降低到了2.6MPa,液态产品的单位能耗降低约53%。对流程的炯分析表明,与原始流程相比,新流程制冷单元的损失大大降低,系统整体的炯效率也得到了提高,LNG冷量回收用于空分流程制冷系统有利于节约生产成本,降低能耗,提高系统能量利用效率。 相似文献
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LNG重卡无相变换热冷能利用空调系统设计 总被引:1,自引:0,他引:1
阐述了LNG重型卡车空调系统冷能利用的设计原理,以LNG为实验介质,通过计算机仿真和实验台模拟试验检验了该系统的可行性。开发了基于LNG无相变低温换热冷能利用空调系统替代蒸汽压缩制冷机组,通过理论计算和空调系统装置实验表明:在环境温度30—35℃,LNG由储存温度-160℃汽化至环境温度15℃,流量为25.194 kg/h时,理论计算冷量释放达6.13 k W,冷回收换热器空调冷媒的进出口温度达-9℃、-15℃;重卡空调进、出口空气温度达35℃、14℃,空调出风量为0.278 m~3/s,静态运行时实际回收冷量1.69 k W,回收率达27.6%。设计冷回收空调系统运行良好,制冷迅速,满足重卡驾驶室空调冷负荷,这样既为LNG船舶和汽车等交通工具空调系统提供了一个有效的解决方案,又利于冷能回收,缓解传统电压缩空调对燃料的消耗。 相似文献
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介绍液化天然气(LNG)冷能利用的必要性和LNG冷能空分设备的流程,分析LNG冷能空分设备所具有的节能、节水和投资成本较高的特点,阐述LNG冷能空分设备的设计要点。 相似文献
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Pavement cold recycling is considered as an efficient rehabilitation method, especially in severely distressed roads. Modifier additives have been used for improving the performance of cold recycled mixture (CRM), especially at initial days of curing. In this study, coal waste taken from coal washing plant and its ash produced through the incineration process were used as pozzolanic additives in CRM with bitumen emulsion. To assess the effects of using these additives on mechanical properties of CRM, Marshall stability, indirect tensile strength (ITS), resilient modulus, dynamic creep and fatigue tests were applied. Furthermore, the effect of using these additives on CRM moisture sensitivity was evaluated. Application of coal waste powder improved the mechanical properties of CRM, but it could not exert a positive effect on CRM moisture sensitivity. Thus, coal waste can be used as CRM additive in conditions that moisture damage does not significantly affect the pavement performance. Unlike the coal waste powder using the coal waste ash not only increased the durability of CRM, but also it showed upgrading the mechanical properties. In continue, the mechanical properties of the CRM containing coal waste and its ash were compared with the mix that stabilised with 1% and 2% ordinary Portland cement (OPC). Based on the comparisons, coal waste powder and its ash had comparable effects to OPC. For example, the results of fatigue tests revealed that at higher strain levels of 200 μ? the fatigue life of the CRM mix containing 7% coal waste and coal waste ash was higher than that of containing 1% and 2% cement. Finally, apart from the several environmental advantages it was concluded that the use of coal waste powder and its ash had technical benefits in cold recycling with bitumen emulsion. 相似文献
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推导冷水管道输送冷水时冷量损失计算模型,指出失冷主要由管壁传热产生,且与流量关系不大。绘制只根据水温和管道特性便能估算冷量损失的失冷图。 相似文献
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LNG冷能空分技术的开发与应用 总被引:1,自引:0,他引:1
随着我国LNG接收站的建设,高效利用LNG冷能具有十分重要的意义。介绍了采用自主专利技术的LNG冷能空分装置的原理、流程特点、关键技术,并介绍了LNG冷能空分装置的工业化应用实例。分析了LNG冷能空分的工业化应用中存在的一些问题,提出了相应的建议。 相似文献