Technology: Compressor

The compressors employed for EUHYFIS stations are based on models developed for natural gas. These types deliver a maximum pressure of up to 350 bar. The corresponding vehicle tank pressure is 200 bar (at 15°C), as established for natural gas. Major requirements consist of long-term wear resistance in a hydrogen environment and a minimum level of impurities in the compressed gas. Standardised limits for residues in hydrogen for fuel cell use do not exist to date. The value for breathing air of 0.5 ppmV was therefore chosen as a first guideline.

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The data recorded in 3,000 hours of test rig operation verify that this concentration is never surpassed. The oil-in-gas concentration typically remains well below 0.1 ppmV. Even when the outlet filters approach saturation after about 1,000 hours, a concentration of 0.2 ppmV is not exceeded.

Major car manufacturers are working on raising hydrogen storage pressures on board to 350 bar in order to increase vehicle range. This will require compressors that can deliver gas at up to 550 bar. Preparations to meet this upcoming new standard have begun in the EUHYFIS consortium.

From its activities in the market for natural gas filling stations, Bauer Kompressoren is experienced in supplying readily assembled and at the same time flexible units consisting of one or more compressors, storage bank and dispenser.

For EUHYFIS plants, the electrolyser setup is added. The storage may be incorporated in the station housing or, depending on the required capacity, placed apart. On the customer’s premises only foundations and electricity & water supply will be required.

The modular concept enables future increases in gas delivery simply by adding components in existing housings or by placing further units alongside earlier installations.