To those working in the field of evaporation, I would like to ask about the advantages, disadvantages, and application areas of TVR, MVR, and multi-effect systems
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As a newcomer in the field of water environmental protection, I would like to ask some experienced colleagues a question. In recent years, in China’s wastewater treatment sector, MVR and multi-effect evaporation technologies have been the preferred options. Generally, if there is an abundance of steam, multi-effect evaporation is used; whereas when steam is scarce, MVR is chosen. The question is this: since thermal vapor compression evaporation (TVR) seems to offer greater energy savings by allowing for one additional stage compared to traditional multi-effect evaporation, why is TVR rarely used in China’s wastewater treatment industry? Those who have used TVRs believe that they are suitable in certain situations; it seems that their advantages become evident when the quality of the steam is relatively high (above 0.8 MPa). Is it perhaps because of the complexity involved in their adjustment? Also, can steam at 1 MPa be directly used as raw steam in the heating chamber of a falling film evaporator? Thank you all
The amount of raw steam used by TVR is far greater than the amount that can be recovered, and the use of secondary steam poses a significant issue: if it can be utilized in its entirety, this leads to energy savings; otherwise, it remains merely a theoretical possibility for energy savings
In other words, the equipment might have to be made very large; if it’s not used in a multi-effect setup but only for single-effect use, and there’s no way to utilize the secondary steam, then it’s not worth it, right?
TVR will use a heat pump; it has a large condenser area and requires a lot of cooling circulating water as well
The temperature at a steam pressure of 8 kilograms is still around 200 degrees even after passing through the temperature and pressure reduction device
http://www.doc88.com/p-6931570466674.html According to this article, TVR requires fresh steam as power for secondary pressurization, which can save 60% in energy consumption; MVR uses mechanical compression and does not need additional fresh steam, achieving an energy savings rate of 85%, thus offering a significant advantage
The initial investment in a project is directly proportional to the savings in energy consumption; this factor determines the payback period for the investment. Feel free to contact me if you need any assistance – I have 5 years of experience in the MVR industry
Here at our unit, the MVR didn’t work, which is frustrating.