Hydrogen compressor
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I’m currently learning about *hydrogen compressors; there’s a lot of information available on forums, but I’m not quite clear about how to determine the maximum compression ratio. Some say that the outlet temperature of the compressor should not exceed 150 degrees (for ammonia synthesis), but in oil refining I find that the inter-stage compression ratio is usually around 2. I would like to ask the experts: how can this limit value be determined, and what is the difference in cost between multi-stage and single-stage systems? Thank you.
The compression ratio is the value obtained by dividing the outlet pressure by the inlet pressure. The higher the compression ratio, the more heat is generated. Theoretically, the compression ratio can be infinitely high, but in practice this is not possible. Considering temperature and efficiency factors, the compression ratio generally does not exceed 4. The specific compression ratio is determined primarily based on the exhaust temperature at each stage; the designed exhaust temperature usually does not exceed 150 degrees.
Generally, levels 1 and 2 can be designed at 150 degrees, while levels 3 and 4 can be designed at 145 or 140 degrees.
The compression ratio generally does not exceed 4; the specific value of the compression ratio is determined primarily by the exhaust temperature at each stage. In our hydrogenation unit, the required exhaust temperature should not exceed 120 degrees.