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.
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]. The Chinese Journal of Process Engineering, 2017
, 17(4)
: 859
-865
.
DOI: 10.12034/j.issn.1009-606X.216329
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