What are the reasons for the low evaporation rate in an MVR system?
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The designed capacity is 15t, but currently only 5t can be achieved in operation
There isn’t enough information to conduct an analysis; it is recommended to provide more details
The shell side of the heat exchanger is connected to a vacuum pump; after operating for some time, the pressure inside the crystallizer is only around ten-odd kPa, and the system temperature is approximately in the high fifties degrees.
http://baike.haosou.com/doc/2516256-2658791.html Principle of MVR evaporators. As I understand it, the difference between MVR and multi-effect evaporation lies in the compression of secondary steam to increase its temperature and pressure, thereby improving the utilization rate of this secondary steam. Therefore, the inlet of the compressor should be connected to the material stream, while the outlet should be connected to the heating steam stream. If the evaporation capacity is insufficient, there could be several reasons: 1) insufficient amount of fresh steam; 2) insufficient capacity of the compressor; 3) inadequate heat exchange efficiency
It must be the low heat exchange efficiency! There are too many organic impurities in the system, causing excessive bubbling that affects heat exchange!
It’s likely that the original data is incomplete and the amount of work required for design is insufficient; otherwise, the extremely low prices lead to cutbacks in quality. P
It shouldn’t happen; the evaporation rate is acceptable during water testing, but it doesn’t work when using actual materials!
It’s impossible to determine whether the design is reliable, and it’s hard to say whether the equipment manufacturing follows standard practices; it’s quite common for ideals to be at odds with reality
I’ve encountered a situation where the difference was so large: the organic content in the raw data was incorrect, leading to severe coking; it wasn’t until preprocessing was applied that things were resolved.
It seems there isn’t enough fresh steam. The temperature and pressure within the system are low, the density of the secondary steam is low, and as a result the compressor cannot achieve a high volume of air delivery. During the water test, no material was discharged, so there was no heat removal due to the discharge of material.