Issues regarding the oil injector of reciprocating compressors
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The compressors in the gasoline-diesel hybrid hydrogen purification unit I’m at are equipped with oil injectors, whereas the compressors used for dry gas hydrogen production do not have oil injectors. Why is that? ? Seeking advice
Whether the cylinder is lubricated with oil or without oil depends largely on the pressure of the unit; generally, compressors equipped with oil injectors operate at higher pressures
It is related to the pressure after compression by the compressor. The pressure of the hydrogen production feed gas after compression and the pressure after compression by the new hydrogen generator are definitely the latter being higher. The compressors used are different; one uses oil lubrication while the other uses oil-free lubrication
It depends on the requirements of the production process. Oil-free lubrication is more energy-efficient than oil-lubricated systems.
1. The pressures differ: the outlet pressure of compressors used for dry gas hydrogen production does not exceed 2.4 MPa, whereas the outlet pressure of compressors in hydrogen purification units is greater than 6 MPa. 2. Oil-lubricated compressors are the ordinary reciprocating compressors, where the cylinders and pistons are lubricated with oil; in oil-free compressors, the piston rings are made of self-lubricating materials, so no lubricating oil is required, and thus the cylinders operate in a oil-free environment
1. The pressures differ: the outlet pressure of compressors used for dry gas hydrogen production does not exceed 2.4 MPa, whereas the outlet pressure of compressors in hydrogen purification units is greater than 6 MPa. 2. Oil-lubricated compressors are the ordinary reciprocating compressors, where the cylinders and pistons are lubricated with oil; in oil-free compressors, the piston rings are made of self-lubricating materials, so no lubricating oil is required, and thus the cylinders operate in a oil-free environment
Filling rings are available in both oil-lubricated and oil-free versions. There are two types: dry gas without it is to prevent oil contamination of the dry gas