Heat transfer enhancement characteristic of twisted elliptical tube heat exchanger at high Re condition and its energy-saving application in mechanical vapor recompression system

IF 3.8 3区 工程技术 Q3 ENERGY & FUELS
Shijie Liu, Zilin Chen, Shuangzhi Yin, Aimin Tu, Dongsheng Zhu
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Abstract

To understand the characteristc of the twisted elliptical tube heat exchanger at high Re conditions and the feasibility of its application in MVR system, the effect of geometric parameters on performance of twisted elliptical tubes was numerically studied. The results demonstrate that overall performance decreases rapidly as Re increases within the range of 13,000 < Re < 60,000. While at 60,000 < Re < 110,000, it stabilizes while still being better than that of circular tubes. A novel MVR evaporation crystallization system using a twisted elliptic tube evaporator is firstly developed. The industrial locale experiment indicates that the twisted elliptic tube evaporator enhances heat transfer, reduces the compression ratio and temperature rise of the vapor compressor and significantly reduces the energy consumption of the MVR system. The average specific energy consumption (SEC) and COP of the MVR system are 32.9 kWh·t−1 and 19.0, respectively. These values are 45.2 % lower and 85.4 % higher than those of the conventional MVR system. The novel MVR system reduces standard coal consumption by approximately 76.6 % and 68.8 % compared to conventional three-effect and four-effect evaporation systems, respectively. These findings show significant energy savings can be achieved by using the twisted elliptic tube evaporator for MVR system.

Abstract Image

高Re条件下扭椭圆管换热器强化传热特性及其在机械蒸汽再压缩系统中的节能应用
为了解螺旋椭圆管换热器在高Re工况下的特性及其在MVR系统中应用的可行性,对螺旋椭圆管的几何参数对换热器性能的影响进行了数值研究。结果表明:在13000 <范围内,随着Re的增大,整体性能迅速下降;再保险& lt;60000年。而在60,000 <;再保险& lt;11万,它稳定,但仍然比圆管好。首次研制了一种新型的螺旋椭圆管蒸发结晶系统。工业现场实验表明,螺旋椭圆管蒸发器强化了传热,降低了蒸汽压缩机的压缩比和温升,显著降低了MVR系统的能耗。MVR系统的平均比能耗(SEC)和COP分别为32.9 kWh·t−1和19.0 kWh·t−1。这些数值比传统MVR系统低45.2%,高85.4%。与传统的三效和四效蒸发系统相比,新型MVR系统分别减少了约76.6%和68.8%的标准煤耗。这些结果表明,在MVR系统中使用扭椭圆管蒸发器可以达到显著的节能效果。
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来源期刊
CiteScore
7.80
自引率
9.30%
发文量
408
审稿时长
49 days
期刊介绍: Chemical Engineering and Processing: Process Intensification is intended for practicing researchers in industry and academia, working in the field of Process Engineering and related to the subject of Process Intensification.Articles published in the Journal demonstrate how novel discoveries, developments and theories in the field of Process Engineering and in particular Process Intensification may be used for analysis and design of innovative equipment and processing methods with substantially improved sustainability, efficiency and environmental performance.
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