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Proposal and assessment of a new integrated liquefied natural gas generation process with auto – Cascade refrigeration (exergy and economic analyses)
Sustainable Energy Technologies and Assessments ( IF 8 ) Pub Date : 2020-06-13 , DOI: 10.1016/j.seta.2020.100728
Mehdi Mehrpooya , Bahram Ghorbani , Seyed Ali Mousavi , Andrew Zaitsev

The main objective of this study is to propose a novel Liquefied Natural Gas (LNG) production process using the auto – cascade refrigeration as the pre-cooling system. This auto – cascade system operates as stand-alone (without external electricity), and can supply the refrigeration temperature of −54.62 °C, which can decrease the total electricity consumption of the process. The Aspen HYSYS V11 software is employed for simulation of this hybrid process. Based on the energy analysis, this integrated process can produce 31.71 kg/s LNG by consuming the specific power of 0.189 kWh/kg LNG. In order to evaluate the system technically, the exergy analysis is implemented for each subunit and the whole process. The outcomes of exergy evaluation depicted that the overall exergy efficiency and overall destroyed exergy rate are 91.68% and 67688 kW, respectively. Also, about 77.3% of the overall irreversibility occurred in the heat exchangers. The economic aspect of this process is evaluated by the Annualized Cost of System (ACS) method. Based on the outcomes of economic assessment, the annualized cost and prime cost of product are accounted for 182.6 MMUS$/year and 0.1959 US$/kg LNG, respectively. In continue, the technical and economic outputs of the proposed configuration are compared to the previous investigations. It was found that by utilizing the auto – cascade refrigeration system as the precooling system of LNG production, the required power and primary costs for producing LNG are considerably reduced. Finally, in order to specify the effects of economic factors on the electricity price, the sensitivity analysis is implemented. Furthermore, the influence of turbine inlet pressure on the efficiency of the hybrid process is investigated.



中文翻译:

提议和评估一种新的自动液化天然气综合生产工艺-级联制冷(能值和经济分析)

这项研究的主要目的是提出一种使用自动级联制冷作为预冷却系统的新型液化天然气(LNG)生产工艺。该自动级联系统可独立运行(无需外部电力),可提供−54.62°C的制冷温度,从而可降低过程的总电力消耗。使用Aspen HYSYS V11软件对该混合过程进行仿真。根据能量分析,该集成过程可以通过消耗比重0.189 kWh / kg LNG来生产31.71 kg / s LNG。为了从技术上评估系统,对每个子单元和整个过程进行了火用分析。火用评估结果表明,总火用效率和总破坏火用率为91.68%和67688千瓦,分别。同样,总不可逆性的约77.3%发生在热交换器中。此过程的经济方面通过系统年度成本(ACS)方法进行评估。根据经济评估的结果,产品的年化成本和主要成本分别为182.6 MMUS $ /年和0.1959 USD / kg LNG。接下来,将拟议配置的技术和经济产出与以前的调查进行比较。结果发现,通过将自动级联制冷系统用作LNG生产的预冷却系统,可以大大降低生产LNG所需的功率和基本成本。最后,为了确定经济因素对电价的影响,进行了敏感性分析。此外,

更新日期:2020-06-13
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