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Hofer diaphragm compressors provide a lubricant and abrasion-free compression of gases and gas mixtures. This invention relates to an apparatus and process for electrochemical compression of hydrogen. The effects of supply pressure and heat source (desorption) temperature on the delivery pressure, amount of hydrogen compressed, and isentropic efficiency of the hydrogen compressor were investigated.

AS 9100B:2004 custom manufacturer of centrifugal & hermetic cold gas compressors for processing hydrogen, nitrogen, oxygen, natural gas & helium with temperatures up to -450 degrees F. Features of gas compressors include high speed direct drive designs, use of variable frequency drives for head or flow conditions & grease packed low vapor pressure rolling elements.

, comprising a plurality of MEA cells connected in series, such that the compressed hydrogen from the hydrogen outlet of a first cell in the series is fed to the hydrogen inlet of the next cell in series, wherein each cell is electrically isolated from the next cell in the series.

Compressors range in power ratings from under 1 hp to 500 hp & with pressure ratings from 50 psig to 7,000 psig. Centrifugal compressors rotate a turbine at very high speeds to compress the gas. Pressure of hydrogen inside a vehicle reaches 70 MPa during fuelling.

In the high enough pressure difference conditions between anode and cathode the electrochemical performance loss results mainly from the dehydration of the proton exchange membrane. Why: Apart from being hard to contain (a propane tank would lose substantial amounts of gas straight through the walls), Hydrogen is _extremely_ reactive and makes metals brittle - especially steels.

Then the electrochemical performance of the hydrogen compression cell is measured with the moisture elimination ability. Howden is determined to take on this responsibility and has developed a range of compressors that fit the need for an affordable source of uncontaminated hydrogen at the high pressure needed for long range mobility.

15. An apparatus for compression of hydrogen, comprising a membrane electrolyte cell assembly (MEA), including a proton-conducting electrolyte membrane, an anode on one side of the membrane and a cathode on the other side of the membrane, the anode having an electrochemically active material for oxidizing hydrogen to protons, the cathode having an electrochemically active material for reducing protons to hydrogen, and further a hydrogen supply inlet and a compressed hydrogen outlet.

The 70 MPa differential pressure data from Ishikawa et al. 12 shows a significantly higher apparent compression effort of about 150%, which might be explained with an increased non-ideal gas behavior, i.e. a hydrogen compressibility factor of approximately 1.4 (60°C, 70 MPa).

Data for gas pressures up to 100 MPa is modeled, based on experimental results up to 5 MPa, of the three pressure concepts and validated with literature data up to 70 MPa. RIX offers industrial grade hydrogen compressors. Electrochemical hydrogen compression is a potentially high efficient, low-maintenance and silent technology to produce high pressure hydrogen.

Labyrinth piston type compressor is most suited for handling combustible gases (O2 etc.) liable to be ignited by heat created by friction. Balanced pressure strategy has lower apparent compression losses at high current densities (my review here 3 A.cm−2) up to about 10 MPa using Nafion 112 or up to 50 MPa using Nafion 117, because the oxygen crossover losses are offset by the OER kinetic gains.