Abstract
The oil free compressors were specially designed for air compression. The National Research and Development Institute for Gas Turbines COMOTI gained a great deal of experience in producing/designing certified oil injection screw compressors for the natural gas field and for several years it has been focusing its research on the use of “dry” (oil-free) compressors in natural gas compression and more recently in hydrogen compression. Working with an explosive gas, one of an idea was to use a nitrogen barrier in oil bearing sealing, which are open source of gases in the atmosphere for such compressors. Worldwide, on-site nitrogen generators have been developed for a purity range of 95…99.5%, and that nitrogen can be supplied in any environment conditions. The present paper will address nitrogen flow with low percentage of oxygen for bearing sealing at the working pressure, the nitrogen consumption, ideas for H2 re-injection and the influence over the global efficiency of the process. Due to the Energy Strategy worldwide, and the studies regarding production, transport and storage of hydrogen in natural gas network, COMOTI has involved researches in developing such possibilities and to express a point of view in existing research in the newly created industry.
Highlights
Based on its experience in the development of screw-type rotary machines with oil injected screw compressor units, COMOTI has begun researching a new type of compressor package with oil-free screw compressor units, as part of a National Research Project
A compression oil-free unit type CD14D [1] was purchased from the company GHH Ingersol-RAND for the realization of the compression assembly designed by National Research and Development Institute for Gas Turbines COMOTI
The fundamental research of new gas compression solutions has led to innovative solutions in the development of oil-free helical compressors
Summary
Based on its experience in the development of screw-type rotary machines with oil injected screw compressor units, COMOTI has begun researching a new type of compressor package with oil-free screw compressor units, as part of a National Research Project. The operating principle of oil-free compressors is identical to that the oil-injected compressors with the specification that the compression is not isothermal but adiabatically, with a high increasing temperature in the compression process. This is the reason why high-compression ratios between the inlet pressure and output pressure are not possible. How to operate the compressor will not be detailed and the focus will be set to its constructive features
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