Why have vapor screw compressors for evaporators not been widely used?
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In China’s current MVR industry, rotary compressors are still the mainstream choice for small systems, while centrifugal compressors are used in larger systems. But for now, it is the rise in compressor temperature that limits the application of MVR technology. As for screw compressors, due to their advantages in terms of principle, they are able to achieve a relatively high temperature rise; yet they have not been widely used. There are various reasons for this. We have been considering using them as well, but we are hesitant to try them out at the moment. We would appreciate it if experts who understand this well could provide analysis and guidance to help us figure things out.
Check the materials first, then the technical solution!
Taking sodium nitrate as an example, a temperature rise of at least 30°C is required, which neither rotary nor centrifugal pumps can achieve; therefore, screw pumps are considered as a suitable option. However, the actual limitations of MVR technology are those of compressor technology; there are not many cases where screw compressors are used even with materials that require high temperature rises
How to deal with sodium nitrate? What solution should be adopted?