How To Teach Hydrogen Compressor

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Hydrogen is chemical energy that can be converted into electrical energy. electrical energy use to fuel industrial applications. It is the highest energy content by weight and has a great potential to be used as an energy storage medium and reduce greenhouse emissions.

However, the density of hydrogen is low at the time of production and it has a pressure of 20-30 bar only. To make it usable as a fuel for energy supply, it needs to be compressed before being transported. This is where the hydrogen compressor comes into action.

Compressed to hydrogen using different types of compressors. That use different methods of applying pressure. Most compressors use either positive displacement compressors or centrifugal compressors.

Types of compressors

  • Reciprocating compressor

A reciprocating compressor is used frequently in the oil and gas industry and consists of a motor that provides electricity to the piston. When the gas enters the chamber, it fills up the cylinder which causes the piston to reduce its volume and pressurize the gas out of the chamber. These compressors are available as non-lubricated and non-lubricated, with the latter preferred more as they reduce oil contamination of hydrogen and provide enough pressure.

  • Rotary compressor

A rotary compressor is a type of gas compressor. Rotary compressors compress the gas through the rotation of screws, gears, vanes, and rollers. Because there is a chance of leakage with the use of positive displacement compressors and the need for tight regulations, using rotary compressors for hydrogen compression can be a challenging application. The rotary gas compressor is a continuous sweeping movement

  • Ionic compressor

In contrast to a piston-metal diaphragm compressor which uses a metal piston, an ionic compressor uses ionic liquids to compress hydrogen gas. Ionic compressors operate without bearings and seals that often lead to failure in reciprocating compressors. These are most commonly found at hydrogen fueling stations with different capacities and pressures.

  • Electrochemical hydrogen compressor

 Electrochemical compressors use a series of membrane electrode assemblies that act like hydrogen fuel cells. They consist of cathodes and anodes with catalysts and electrolytes in between. An electric voltage is applied to the membrane electrode, resulting in an electric current that draws hydrogen toward the membrane. Hydrochemical compression of hydrogen causes a pressure of 1000 bar.

  • Centrifugal compressor

Centrifugal compressors are used in pipeline applications because of their high rate of gas compression. They use impellers or turbines that rotate at high pressures to propel and compress the gas. Due to the low molecular weight of hydrogen, hydrogen centrifugal compressors operate at a faster rate than natural gas compressors.

  • Hydride compressor

 Hydride compressors involve the use of metals that form hydrides, which are hydrogen ions only. Through an exothermic reaction, the hydride absorbs low-pressure hydrogen and converts it to high-pressure hydrogen when heated. Hydrides are heated by either an electric coil or water.

  • Piston-metal diaphragm compressor

 Piston metal diaphragm compressors use both piston and diaphragm to compress and compress hydrogen gas. These are high-pressure compressors that generate heat. For this reason, the compressed gas is cooled between stages to make the compressed process out thermal.

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