Problems with using screw compressors to compress hydrogen
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I have a few questions: For a screw compressor, under the following operating conditions – inlet at atmospheric pressure, outlet pressure of 9 kilograms, and double-end mechanical seal for sealing – ① is it necessary to use nitrogen for pre-purging when compressing hydrogen? How effective is it? ②Will hydrogen seep into the oil system from the mechanical seal in the absence of nitrogen?
It is best to operate and use it in strict accordance with the operating procedures. If there are any doubts, it is necessary to communicate and coordinate with the manufacturer and the design institute, asking them to provide technical documentation. Since screw compressors have various applications and structures, it is impossible to make generalizations; this is provided for reference only.
It’s not the actual engine unit; it’s just an assumption. Under such operating conditions, I believe that if hydrogen is used, internal leakage would be quite severe at high pressure ratios. However, it’s not clear whether it’s necessary to fill the system with nitrogen, nor what impact the nitrogen pressure level has on the operation of the main engine
①Is pre-purging with nitrogen required when compressing hydrogen? How effective is it? ②Will hydrogen seep into the oil system from the mechanical seal in the absence of nitrogen? 1. It is necessary to refer to the physical and chemical properties of hydrogen; if a replacement is required in this regard, it must be based on successful replacement analysis. 2. Yes. Also, your diagram doesn’t seem to be related to the discussion question. The relevant impacts of the compressor depend on the assessment of the unit’s structure. It is best to discuss it using an example of a specific model. For reference.