文章摘要
采用涡流管和喷射器的低温空气源热泵进行LNG汽化的新型加热系统分析
Analysis on two novel vortex tube and/or ejector combined low-temperature air-source heat pump systems for LNG regasification
投稿时间:2018-09-18  修订日期:2018-11-21
DOI:
中文关键词: LNG汽化  空温式汽化器  涡流管  喷射器  节能
英文关键词: LNG regasification  ambient air vaporizers  Ranque-Hilsch vortex tube  ejector  energy saving
基金项目:国家自然科学基金
作者单位E-mail
郭向吉 大连理工大学能源与动力学院 xjguo@mail.dlut.edu.cn 
张升升 中国运载火箭技术研究院研究发展中心  
张博 大连理工大学能源与动力学院 zhangbo@dlut.edu.cn 
李玲 大连理工大学能源与动力学院  
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中文摘要:
      本文首次提出了两种新型空气源热泵,核心部件包括涡流管、喷射器和空温式换热器,用于从低温环境中吸收热量,该空气源热泵取代了传统LNG再气化过程中水浴式加热器的位置,吸收到的热量可用于补偿从空温式气化器吸热后温度仍不达标的天然气,以达到降低甚至无需水浴式加热器耗能的目的。在这两个新型加热系统中,其主要原理是通过气体在涡流管冷端温度降低,使得天然气可以进一步在空温式换热器继续从环境中吸收热量。除了给出详细的系统描述之外,本文还建立了数学定量模型,并设定了具体工况,对两个加热系统的性能、能耗和相对于传统加热系统的节能比进行了计算和分析。结果表明,当气体升温要求在5oC到30oC之间时,不带有喷射器的加热系统节能比在50%以上,而带有喷射器的加热系统节能比可在90%以上。
英文摘要:
      In this paper two novel air-source heat pumps, mainly consisting of a vortex tube, ejector and air-heater, was proposed to absorb heat from low-temperature ambient air. Such heat will be supplemented to the LNG regasification process, taking the place of water-bath heater, to minimize electricity or natural gas consumption. The system description is introduced, together with the mathematical simulation model to evaluate the system feasibility. The key component is a Ranque-Hilsch vortex tube for the two systems (ejector also plays an important role in the secondary heating system) and heat can be extracted from the ambient air in the ambient air heat exchanger with the gas temperature drop down at the cold end of vortex tube. Preliminary quantitative analyzation was conducted for the average temperature rise requirement ranges from 5-30 oC annually. The results shown that both systems can save large amount of energy from the water-bath heater, although the energy saving ratio decreases with the increasing temperature rise requirement.
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