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Hydrogen Compressor

A hydrogen compressor is a device that increases the pressure of hydrogen by reducing its volume resulting in compressed hydrogen or liquid hydrogen. Hydrogen is typically produced at relatively low pressures (20–30 bar) and must be compressed prior to transport. Most compressors used today for gaseous hydrogen compression are either positive displacement compressors or centrifugal compressors.

Types of Hydrogen Compressor:

Reciprocating Piston Compressors

A proven method to compress hydrogen is to apply reciprocating piston compressors. Reciprocating piston compressors are commonly available as either oil-lubricated or non-lubricated; for high pressure (350 - 700 bar), non-lubricated compressors are preferred to avoid oil contamination of the hydrogen.

Ionic liquid piston compressor

An ionic liquid piston compressor is a hydrogen compressor based on an ionic liquid piston instead of a metal piston as in a piston-metal diaphragm compressor.

Electrochemical Hydrogen Compressor

A multi-stage electrochemical hydrogen compressor incorporates a series of membrane-electrode-assemblies (MEAs), like those used in proton-exchange membrane fuel cells; this type of compressor has no moving parts and is compact. The electrochemical compressor works like a fuel cell, a voltage is applied to the membrane and the resulting electric current pulls hydrogen through the membrane.

Hydride Compressor

In a hydride compressor, thermal and pressure properties of a hydride are used to absorb low-pressure hydrogen gas at ambient temperatures and then release high-pressure hydrogen gas at higher temperatures; the bed of hydride is heated with hot water or an electric coil.

Piston-Metal Diaphragm Compressor

Piston-metal diaphragm compressors are stationary high-pressure compressors, four-staged water-cooled, 11–15 kW, 30–50 Nm3/h 40 MPa for dispensation of hydrogen. Since compression generates heat, the compressed gas is to be cooled between stages making the compression less adiabatic and more isothermal.

Guided rotor compressor.

The guided rotor compressor (GRC) is a positive-displacement rotary compressor based upon an envoluted trochoid geometry which utilizes a parallel trochoid curve to define its basic compression volume. It has a typical 80 to 85% adiabatic efficiency.

Linear compressor

The single-piston linear compressor uses dynamic counterbalancing, where an auxiliary movable mass is flexibly attached to a movable piston assembly and to the stationary compressor casing using auxiliary mechanical springs with zero vibration export at minimum electrical power and current consumed by the motor. It is used in cryogenics.

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