喷气增焓型单级MVR蒸发结晶系统性能分析

doi:10.16085/j.issn.1000-6613.2017-2497

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

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 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 Hanzhi^1,2,3, LI Shuaiqi^1,2,3, HUANG Chong^1,2,3, HE Shihui^1,2,3, SONG Wenji^1,2,3, FENG Ziping^1,2,3

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/Abstract

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P_flash、物料入口浓度c₀、物料循环倍率CR、换热温差△T_preh和△T_mhex以及补气压比指数n和补气率β_v对系统热效率COP、单位闪蒸量的压缩机耗功w_comp、压缩机出口蒸汽过热度△t_suph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w_comp以及更小的△t_suph；随CR增大，压缩机增压比降低了32.8%，COP提高了54.8%；随P_flash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△T_mhex对MVR系统性能影响更为显著，△T_mhex每增大1K，COP平均降低4.0%、w_comp平均升高4.9%、UA_mhex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 (P_flash), the feeding waste water salinity (c₀), the preheater and main heat exchanger temperature differences (△T_preh and △T_mhex), 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 (w_comp), compressor outlet superheat (△t_suph) and heat exchanger design parameters (UA_mhex and UA_preh) were studied in detail. The results showed that the vapor injected MVR system obtains higher COP, lower w_comp and less △t_suph. 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 P_flash, and it appears among 30-35kPa. Comparing to △T_preh, the influences of the △T_mhex are more prominent, and the COP decreases by 4.0%, the w_comp and UA_mhex increase by 4.9% and 8.9%, respectively, per unit raise in △T_mhex.

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

中图分类号:

TQ51

王汉治, 李帅旗, 黄冲, 何世辉, 宋文吉, 冯自平. 喷气增焓型单级MVR蒸发结晶系统性能分析[J]. 化工进展, 2018, 37(09): 3312-3319.

WANG Hanzhi, LI Shuaiqi, HUANG Chong, HE Shihui, SONG Wenji, FENG Ziping. Performance analysis of single-effect MVR evaporative crystallization system using vapor injected compressor[J]. Chemical Industry and Engineering Progress, 2018, 37(09): 3312-3319.

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喷气增焓型单级MVR蒸发结晶系统性能分析

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

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