Selection of chillers for synthetic ammonia systems
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Which has a better cooling effect, screw chillers or reciprocating chillers, in ammonia synthesis plants? What are the advantages and disadvantages?
These days, screw types are generally preferred, with reciprocating types being used much less often. Compared to the latter, the advantages of screw types include: lower failure rate, lower maintenance costs, lower energy consumption, higher efficiency, better overall performance, and less space requirement； The downside is that it’s a bit more expensive; due to its relatively complex structure, higher technical skills are required for maintenance.
First centrifugal compressor, second screw compressor; no others!
Check the cooling capacity; a larger centrifuge is suitable
For small scales, choose screw type; for large scales, choose centrifugal type. Reciprocating type is not recommended
The reciprocating type has a high operating temperature. Screw compressors have low power. Centrifugal investment is high.
For achieving low temperatures, screw compressors are a better choice as they are suitable for harsh operating conditions. Centrifuges are generally used for cooling purposes in air conditioning applications; there are very few cases where multi-stage centrifuges are used to achieve low temperatures.
Is the internal pressure ratio of the screw adjustable? ? When the pressure of the ammonia tank is low in winter, the drop in current isn’t significant, right?