化工进展 ›› 2018, Vol. 37 ›› Issue (09): 3312-3319.DOI: 10.16085/j.issn.1000-6613.2017-2497

• 化工过程与装备 • 上一篇    下一篇

喷气增焓型单级MVR蒸发结晶系统性能分析

王汉治1,2,3, 李帅旗1,2,3, 黄冲1,2,3, 何世辉1,2,3, 宋文吉1,2,3, 冯自平1,2,3   

  1. 1 中国科学院广州能源研究所, 广东 广州 510640;
    2 中国科学院可再生能源重点实验室, 广东 广州 510640;
    3 广东省新能源与可再生能源研究开发与应用重点实验室, 广东 广州 510640
  • 收稿日期:2017-12-05 修回日期:2018-01-24 出版日期:2018-09-05 发布日期:2018-09-05
  • 通讯作者: 黄冲,高级工程师,研究方向为MVR系统集成及行业应用推广。
  • 作者简介:王汉治(1991-),男,硕士,研究方向为热泵技术及分布式能源系统。
  • 基金资助:
    广东省省级科技计划项目(2014B050505014,2013B091500088)。

Performance analysis of single-effect MVR evaporative crystallization system using vapor injected compressor

WANG Hanzhi1,2,3, LI Shuaiqi1,2,3, HUANG Chong1,2,3, HE Shihui1,2,3, SONG Wenji1,2,3, FENG Ziping1,2,3   

  1. 1 Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, Guangdong, China;
    2 CAS Key Laboratory of Renewable Energy, Guangzhou 510640, Guangdong, China;
    3 Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, Guangdong, China
  • Received:2017-12-05 Revised:2018-01-24 Online:2018-09-05 Published:2018-09-05

摘要: 针对工业废水蒸发结晶过程中含盐浓度增大、从而导致沸点升和增压比偏高等问题,提出了喷气增焓型单级机械式蒸汽再压缩(MVR)蒸发结晶系统。基于EES软件建立了喷气增焓型单级MVR蒸发结晶系统数值模型,并研究了闪蒸压力Pflash、物料入口浓度c0、物料循环倍率CR、换热温差△Tpreh和△Tmhex以及补气压比指数n和补气率βv对系统热效率COP、单位闪蒸量的压缩机耗功wcomp、压缩机出口蒸汽过热度△tsuph和换热器UA值等参数的影响。结论如下:喷气增焓型MVR系统相比无喷气过程的单级MVR蒸发结晶系统具有更高的COP、更低的wcomp以及更小的△tsuph;随CR增大,压缩机增压比降低了32.8%,COP提高了54.8%;随Pflash增大,COP呈先降后升趋势,在30~35kPa时存在最低值;换热系统中,主换热器温差△Tmhex对MVR系统性能影响更为显著,△Tmhex每增大1K,COP平均降低4.0%、wcomp平均升高4.9%、UAmhex平均增加8.9%。

关键词: 废水处理, 溶解性, 喷气增焓, 蒸发结晶, 过热度

Abstract: Considering the industrial waste is always characterized with high salinity in the evaporative crystallization process, a single-effect mechanical vapor recompression (MVR) system with vapor injected compressor was proposed to deal with the issues like high boiling temperature lift, high-pressure ratio and high compressor superheat. A mathematical model has been developed using the engineering equation solver (EES). The effects of the flashing pressure (Pflash), the feeding waste water salinity (c0), the preheater and main heat exchanger temperature differences (△Tpreh and △Tmhex), the vapor injection pressure ratio index (n) and the waste water circulation ratio (CR) on the coefficient of performance (COP), compression work for unit flashed vapor (wcomp), compressor outlet superheat (△tsuph) and heat exchanger design parameters (UAmhex and UApreh) were studied in detail. The results showed that the vapor injected MVR system obtains higher COP, lower wcomp and less △tsuph. With the increase of the CR, the pressure ratio decreased 32.8% and the COP increased 54.8%. There exists a lowest COP with the increase of Pflash, and it appears among 30-35kPa. Comparing to △Tpreh, the influences of the △Tmhex are more prominent, and the COP decreases by 4.0%, the wcomp and UAmhex increase by 4.9% and 8.9%, respectively, per unit raise in △Tmhex.

Key words: waste water treatment, solubility, enhanced vapor injection, evaporative crystallization, superheat

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