MVR vertical forced circulation evaporator
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Who can summarize for me the steps for calculating the equipment selection for a MVR vertical forced-circulation evaporator? That is, given the evaporation rate, the pressure in the separation chamber, and the saturation vapor pressure of the feed steam, it is possible to calculate the heat exchange area of the heating chamber, the flow rate of the forced circulation pump, the liquid level in the separation chamber, the air volume of the compressor, and so on.
I’ll try it myself; I hope the experts can give some guidance
The medium is saltwater; I just want to ask about the steps for the entire calculation process
Not all media are suitable for use with MVR evaporators due to the increase in boiling point.
After ASPEN PLUS simulation, combined with the material energy balance, a complete calculation can be carried out; for details on the simulation process, please contact @691951325QQ
Weigh the pros and cons, consider the investment in equipment and its economic benefits, as well as energy savings and consumption reduction; use it only when it is appropriate
MVR has limitations. 1. Generally, the boiling temperature of a salt solution increases as its concentration rises; this is the concept of boiling point elevation. The boiling point elevation of some solutions is very high, over 20 degrees, 30 degrees. Such as an aqueous solution of calcium chloride. The temperature rise of the compressor is generally 15 to 16 degrees, with some cases reaching up to 20 degrees. When the boiling point of the solution rises above the temperature increase of the compressor, the secondary steam produced by the compressor can no longer be used to heat the material. In this case, MVR cannot be used. Generally, when the boiling point exceeds 15 degrees, it is not recommended to use MVR evaporators; instead, multi-effect evaporation should be employed. 2. For evaporation rates of less than 1 ton per hour, the use of MVR is not recommended. The return on investment for energy savings is far too low.
If the process flow is reasonable, MVR still has considerable potential.