Refrigeration unit
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The process requires a refrigerant at -45 degrees; whether to use a screw compressor or an ammonia compressor, and whether to employ two-stage or single-stage compression. What are some good refrigeration units or advanced refrigeration technologies available currently?
What kind of refrigerant medium is better to use?
Liquid nitrogen can be used for cooling, but what process is employed? Pointed it out upstairs?
The temperature provided by liquid nitrogen is much lower than what is required; it’s fine for conducting experiments, but for large-scale production a continuous and relatively inexpensive cold source is needed, in which case liquid nitrogen loses its advantage.
Using liquid nitrogen is convenient, but it’s relatively expensive; we’ve used liquid nitrogen at this temperature before. Ammonia is a medium-temperature refrigerant; in single-stage refrigeration, its evaporation temperature is generally around -25 degrees Celsius ； Two-stage refrigeration, with an evaporation temperature of around -50 degrees. The minimum evaporation temperature of a refrigerant is generally 10 to 20 degrees higher than its freezing point.
What about the specific processes, unit selection, and performance? How is the use of NH3? Is ethanethiol or brine used as the refrigerant?
Refrigeration can be achieved using R404 refrigerant and a two-stage compression system. The temperature can generally reach around -60.
The ammonia-CO2 cascade technology can be used, offering higher efficiency than conventional two-stage compression and being safer