What is the purpose of the hydrogen bypass in the diesel hydrogenation cycle?
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The premise is that the cyclic hydrogen compressor is a reciprocating compressor
Control the hydrogen flow rate into the reactor
Bypass regulation is used in conjunction with the unloader; when the system requires a low amount of hydrogen, a portion of it is returned to the inlet liquid separation tank.
A centrifugal compressor equipped with a return line is used to prevent surge in the compressor. In reciprocating compressors, it serves for flow rate regulation; when the pressure in the reaction system does not need to be very high, a portion of the fluid is returned to the inlet. This line is generally not used under normal circumstances
What the original poster is referring to is probably the line from the press outlet back to the inlet. It is mainly used for adjusting the load. Unlike centrifuges, reciprocating machines allow for stepwise regulation of flow, and the load cannot be controlled precisely; it is this bypass valve that serves this purpose.