In recent years, due to the rapid development of the petrochemical industry, advanced hydrogenation processes have been widely adopted in the petroleum refining industry. This requires the mechanical industry to provide a complete set of hydrogenation equipment, and hydrogen compressors are one of them.
According to the different working principles and internal structures, compressors can be divided into two categories: mechanical compressors and non mechanical compressors. Mechanical compressors are divided into four categories: liquid driven compressors, diaphragm compressors, linear compressors, and ionic liquid compressors; Non mechanical compressors are divided into four categories: low-temperature liquid pumps, metal hydride compressors, electrochemical hydrogen compressors, and adsorption compressors.
Due to the low density and small volume energy density of hydrogen, hydrogen compressors must have the characteristics of high pressure, high flow rate, safety, and good sealing. While preventing hydrogen embrittlement, they should strive to minimize energy loss as much as possible. At present, most hydrogen refueling stations in China use liquid driven compressors and diaphragm compressors.
The structure of hydrogen compressors is relatively complex, with important components including cast iron cylinders, cast iron cylinder liners, cast iron cylinder heads, cast iron crankshafts, connecting rods, crossheads (including crosshead slides), packing, pistons (including piston rings), oil scraper rings, stainless steel piston connecting rods, stainless steel gas valves, etc. In addition, there are some auxiliary equipment such as gas filters, buffers, lubricating oil pipelines, etc. Like other reciprocating compressors, hydrogen compressors include three processes: suction, compression, and exhaust. Under the drive of the motor, the crankshaft drives the crosshead, piston connecting rod, and piston to move back and forth in the cylinder. The gas is compressed by the piston and finally discharged through the gas valve.
In the chlor alkali industry, the main function of the hydrogen compressor is to cool and purify the high-temperature and humid hydrogen gas from the electrolysis process, pressurize and transport it, and maintain the stable pressure of the hydrogen system to ensure the safe and stable operation of the electrolysis tank.
Currently, enormous environmental pressure and the gradual depletion of traditional fossil fuels have led countries around the world to actively seek new clean energy sources. Hydrogen energy and hydrogen fuel cells are increasingly receiving attention from countries around the world due to their good environmental performance, high energy conversion efficiency, and certain economic benefits. In order to promote the development of hydrogen energy, the improvement of hydrogen infrastructure is essential. The hydrogen compressor is one of the three core key individual equipment required for the construction of hydrogen refueling stations.
In addition to the aforementioned, hydrogen compressors can also be used in diesel hydrogenation units. I believe that with the continuous development of technology, hydrogen compressor technology will be better applied in industry.
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