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2011 (Vol. 3, Issue: 11)
Article Information:

Energy-Saving Study of a System for Ammonium Sulfate Recovery from Wastewater with Mechanical Vapor Compression (MVC)

Lin Liang and Dong Han
Corresponding Author:  Lin Liang 

Key words:  Ammonium sulfate wastewater, ASPEN PLUS, energy saving, mechanical vapor compression, , ,
Vol. 3 , (11): 1227-1232
Submitted Accepted Published
2011 July, 20 2011 September, 07 2011 November, 25
Abstract:

In this study, a new two stage Mechanical Vapor Compression (MVC) system which is used to recycle ammonium sulfate is investigated. In evaporation process, there are many efficient ways such as multiple-effect evaporation, multi-stage flash, thermal vapor compression, and mechanical vapor compression and so on. In these ways MVC is considered to be more effective. Now, almost all of the MVC systems in the literatures are about one stage structure. However, in the other process such as continuous crystallizer, if one stage MVC system is adopted, a lot of energy will be wasted. Therefore, in order to further save energy, a new system should be proposed. In this study, a new two stage MVC system is proposed and analyzed using the software of ASPEN PLUS. The first stage is a forcible recycle evaporator with MVC and the second one is a forcible recycle crystallizer with MVC. The energy consumption is discussed as a function of the middle concentration and the operating temperature. The results show that the compressor power decreases with the increase in the operating temperature and the optimal compressor power is obtained when the mass concentration is about 32%. Compared with one stage MVC system the running cost of the new system can be saved 29.2% and more than 25.8% of the energy can be saved. Additionally, it can save running cost over 42.2% and save energy more than 59.6% compared with the conventional multi-effect system.
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  Cite this Reference:
Lin Liang and Dong Han, 2011. Energy-Saving Study of a System for Ammonium Sulfate Recovery from Wastewater with Mechanical Vapor Compression (MVC).  Research Journal of Applied Sciences, Engineering and Technology, 3(11): 1227-1232.
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ISSN (Online):  2040-7467
ISSN (Print):   2040-7459
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