Hydrogen is typically produced at relatively low pressures (20-30 bar) and must be compressed prior to transport. For the fuel cell industry, the electrochemical hydrogen compressor can be applied interfacing: 1) a hydrogen production device (i.e. fuel processor, electrolyzer, etc.) and a fuel cell; 2) a hydrogen production device and a hydrogen storage device; and 3) a hydrogen storage device and a fuel cell.
The multi-stage compressor embodiment includes a plurality of PEM cells connected in series, such that the compressed hydrogen from the 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 adjacent cell in the series.
Its characteristics with respect to hydrogen compression efficiency are discussed below. 7 is a graph showing the results of electrochemical hydrogen compression to 45 psia (T=22° C.; i=0.6 A). As the pressure of cathode compartment increases, the moisture contents of hydrogen decrease, however, the electrochemical performance of the compression cell is deteriorated.
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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 prototype solid-state, multi-stage compressor incorporates a series of membrane-electrode-assemblies (MEAs), similar to those used in proton exchange membrane fuel cells. The compressor station consists of a dual street compression line and all necessary peripherals for post treatment of compressed gases including cooling and drying.
In order to meet the purity requirements of high tech markets such as fuel cell vehicles, SMR-produced hydrogen must undergo additional purification, normally via pressure swing adsorption (PSA). Diaphragm compressors rage in size 3 hp to 250 hp. As a rule, we deliver our diaphragm compressors as complete units, including a base frame, a power unit, pulsation dampers, coolers, automatically- or manually-operated valves, instruments and, if requested, a control unit.
Metal hydride compressors use metals that form hydrides via exothermic reactions and then release hydrogen at high pressures when heat is applied. This energy efficient hydrogen compressor reduces the energy required to compress hydrogen generated by polymer electrolyte membrane (PEM) water electrolysis.
1. Hydrogen must be remove from all oxygen making hydrogen an inert gas form. Centrifugal compressors are the compressor of choice for pipeline applications due to their explanation high throughput2 and moderate compression ratio. The R-inside compressor system will serve as the heart of the new hydrogen refueling station that is being built by the company PitPoint.
This breakthrough represents an important step in the development of a technology that is targeted to deliver hydrogen at 10,000 psi — a level that industry experts currently believe is necessary to give fuel cell cars a 'running time' between refueling that is competitive with internal combustion engine cars.