Design and Analysis of an Evaporation System of Solutions with High Boiling Point Elevation

doi:10.12034/j.issn.1009-606X.216329

Chin. J. Process Eng. ›› 2017, Vol. 17 ›› Issue (4): 859-865.DOI: 10.12034/j.issn.1009-606X.216329

• Environment & Energy • Previous Articles Next Articles

Design and Analysis of an Evaporation System of Solutions with High Boiling Point Elevation

Yan LIU^1*, Chenglin PEI², Jianda WANG¹, Tiantian XIA², Wei ZHANG¹, Yawei DU¹

1. School of Marine Science and Engineering, Heibei University of Technology, Tianjin 300130, China;
2. Department of Chemical Engineering, Heibei University of Technology, Tianjin 300130, China

Received:2016-10-19 Revised:2017-01-16 Online:2017-08-20 Published:2017-08-16

高沸点升溶液蒸发系统的设计与分析

刘燕^1*，裴程林²，王建达¹，夏天天²，张伟¹，杜亚威¹

1. 河北工业大学海洋科学与工程学院，天津 300130；2. 河北工业大学化工学院，天津 300130

通讯作者: 刘燕 Julia_liuyan@hebut.edu.cn
基金资助:
河北省科技支撑计划;河北省自然基金;河北省高等学校青年拔尖人才计划项目

Abstract

Abstract: A hierarchical compression mechanical vapor recompression (MVR) evaporation system was proposed by taking account of the high boiling point elevation of solutions and the actual capability of steam compressors raised the temperature and pressure of secondary steam. Theoretical models were established for the hierarchical and multistage compression MVR evaporation systems and the effects of operating parameters such as the solution boiling point elevation (BPE), the compressor compression ratio and the outlet mass fraction on system energy consumption, the heat transfer area of the evaporator, the cost of equipment and the total cost of the system were investigated. The results showed that the hierarchical compression MVR evaporation system was more suitable for solutions with boiling point elevation over 15oC. Sodium hydroxide solution was used for a case study. The optimal operating conditions were the first stage effluent concentration 23%(?) when the compressor compression ratio 2.0. Under such conditions, the same amount of water evaporation were completed, the hierarchical compression MVR evaporation system reduced energy consumption by 47.83% and equipment cost by 28.75%, better than the multistage compression MVR system in saving energy effect.

Key words: High boiling point elevation, Mechanical vapor recompression, Hierarchical compression, Multistage compression, Evaporation

摘要： 针对高沸点升溶液蒸发过程的特点，结合蒸汽压缩机提升二次蒸汽压力和温度的实际能力，提出一种分级压缩的机械蒸汽再压缩(MVR)蒸发系统，建立了分级压缩和多级压缩MVR蒸发系统的数学模型，考察了溶液沸点升高、压缩机压缩比和一级排出液浓度等运行参数对蒸发系统能耗、蒸发器换热面积、设备成本和系统总费用的综合影响. 结果表明，分级压缩MVR蒸发系统适用于沸点升在15℃以上的物料，NaOH溶液浓缩的最优操作工况为压缩机压缩比2.0、一级排出液浓度23%(?). 相同蒸发水量下，分级压缩MVR蒸发系统可节约47.83%的系统能耗和28.75%的设备成本，比多级压缩MVR蒸发系统节能效果好.

关键词: 高沸点升, 机械蒸汽再压缩, 分级压缩, 多级压缩, 蒸发

Yan LIU Chenglin PEI Jianda WANG Tiantian XIA Wei ZHANG Yawei DU. Design and Analysis of an Evaporation System of Solutions with High Boiling Point Elevation[J]. Chin. J. Process Eng., 2017, 17(4): 859-865.

刘燕裴程林王建达夏天天张伟杜亚威. 高沸点升溶液蒸发系统的设计与分析[J]. 过程工程学报, 2017, 17(4): 859-865.

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Design and Analysis of an Evaporation System of Solutions with High Boiling Point Elevation

高沸点升溶液蒸发系统的设计与分析

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