Multi-effect and MVR
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What kind of fluid media can only be evaporated using multi-effect evaporation and not MVR evaporation?
Wastewater solutions containing high amounts of ammonium chloride are treated by evaporation and crystallization; the boiling point of such ammonium chloride solutions rises significantly, to 18 degrees, and it is difficult for ordinary compressors to achieve such a temperature rise, making separation challenging. Furthermore, there is no absolute distinction between MVR and multi-effect systems; the difference lies mainly in energy savings. In areas such as Ningxia where coal mines are abundant, steam is relatively cheap; many manufacturers opt for multi-effect evaporation, in the hope that this will be helpful to you
The following two factors generally rule out the use of MVR: 1. A high boiling point elevation – considering a heat transfer temperature difference of 6–8 degrees, the boiling point elevation should not exceed 16 degrees, with a maximum pressure ratio of 2.2. 2. The cost of steam as a by-product is very low; in such cases, MVR is not economical (typically, 40 kWh of electricity is required to evaporate one ton of water). With over five years of experience in MVR system design, project development, installation, commissioning, and after-sales support, feel free to contact me via QQ at 691951325 if you have any questions