Full-operating-condition performance improvement strategy and optimal design of a two-stage ejector with auxiliary secondary flow for MED-TVC systems

IF 6.1 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2024-11-19 DOI:10.1016/j.applthermaleng.2024.124957

Qingyang Han , Hailun Zhang , Wenxu Sun , Haoyuan Xue , Zhizheng Zhang , Lei Jia

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引用次数: 0

Abstract

Periodic fluctuation of steam-source pressure occurs in the thermal vapor compression multi-effect distillation (MED-TVC) systems. Because ejectors are sensitive to the boundary conditions, as a key component for recovering excess steam in systems, ejectors experience a rapid decline in performance when the steam-source pressure fluctuates and does not satisfy the design condition. This decline negatively impacts the overall system performance and reduces the energy utilization efficiency. Therefore, a two-stage ejector with auxiliary secondary flow (ASF-TSE) and a full-operating-condition performance improvement strategy were developed in this study to enhance the ejector performance under full working conditions and broaden the efficient operation range of ejectors. The flow field characteristics and performance of the ASF-TSE, single ejector (SE), and two-stage ejector (TSE) in the low and design-pressure ranges were compared and investigated. The results showed that within the design-pressure range, the maximum and average increase ratios of the ASF-TSE for entrainment performance compared with the TSE are 17.53 % and 13.43 %. Moreover, the entrainment capacities of the three ejectors were compared and analyzed in the full operating range. Simulation results show that compared with the SE and TSE, the entrainment performance of the ASF-TSE is improved by 87.5 % and 8.0 %, respectively.

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用于 MED-TVC 系统的带辅助二次流的两级喷射器的全工况性能改进策略和优化设计

在热蒸汽压缩多效蒸馏（MED-TVC）系统中，蒸汽源压力会出现周期性波动。由于喷射器对边界条件非常敏感，作为回收系统中过剩蒸汽的关键部件，当蒸汽源压力波动且不满足设计条件时，喷射器的性能会迅速下降。这种性能下降会对整个系统的性能产生负面影响，并降低能源利用效率。因此，本研究开发了带辅助二次流的两级喷射器（ASF-TSE）和全工况性能改进策略，以提高喷射器在全工况下的性能，扩大喷射器的有效运行范围。对 ASF-TSE、单级喷射器（SE）和双级喷射器（TSE）在低压和设计压力范围内的流场特性和性能进行了比较和研究。结果表明，在设计压力范围内，与 TSE 相比，ASF-TSE 的最大和平均夹带性能提高率分别为 17.53 % 和 13.43 %。此外，还对三种喷射器在整个工作范围内的夹带能力进行了比较和分析。模拟结果表明，与 SE 和 TSE 相比，ASF-TSE 的夹带性能分别提高了 87.5 % 和 8.0 %。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.