Compressor use

What are the uses of compressors? We can look at them according to their classification.

The use of compressors can be roughly divided into four types: I, compressed air as power II, used in chemical processes III, compressed gas for refrigeration and separation IV, gas transportation

①. Compressed air as power. Compressed air drives various pneumatic machinery and pneumatic tools for controlling instruments and automation devices, as well as the launch of certain weapons for national defense and scientific research, the ups and downs of submarines and the salvage of sunken ships, all require different gases. pressure.

Compressed air has the characteristics of easy storage, easy control, good fluidity, safety and environmental protection. Therefore, compressed air is also considered to be the second power source after electricity.

In the chemical industry, the gas pressure is conducive to the chemical reaction, improve the reaction speed and yield, and can reduce the size of the equipment and reduce the project cost.

For example, the ammonia synthesis process in chemical fertilizer production requires hydrogen and nitrogen to react at a pressure of 15-100MPa, urea production requires chemical reaction of carbon dioxide and ammonia at 21MPa, while the process of ethylene polymerization to produce plastics requires a working pressure as high as 280MPa, and petroleum hydrogenation refining requires a pressure of 7-32MPa.

③, compressed gas for refrigeration and separation of gas after compression, cooling, expansion and liquefaction. For artificial refrigeration (refrigeration, refrigeration and air conditioning, such as ammonia and Freon compressor, the pressure is usually 8-14bar, this type of compressor is called refrigeration compressor.

If the liquefied gas is a mixed gas, the components can be separated separately according to their different gasification temperatures in the separation device to obtain various gases of purity. For example, after the separation of air liquefaction, pure oxygen, pure nitrogen and pure xenon, neon, argon, helium and other rare gases can be obtained. Air separation (air separation) plants are based on compressed gas for gas purification.

With the rapid development of China's petrochemical industry, the separation of its raw material gas, petroleum cracking gas, is first compressed and then separated by different cooling temperatures.

④. Gas transportation There are pipeline transportation and bottled transportation methods for gas transportation. When the gas volume is large, the pipeline transportation is used. At this time, the purpose of compressed air is to increase the pressure of the gas to overcome the pipeline resistance in the flow process, and make the smaller The pipe diameter transports as much gas as possible. The pressure of transporting gas is 3-30bar, and the pipeline of transporting natural gas needs a pressure of 10-100bar.

Compressor for gas bottling, depending on the nature of the gas. Generally, the pressure of oxygen cylinder is 150bar, the nature of acetylene gas is unstable, the bottling pressure is 25bar, and it is adsorbed by acetone. Some gases with high critical temperature that are easy to liquefy can be compressed first, cooled and then liquefied and bottled, such as chlorine bottling pressure of 10-15bar and carbon dioxide bottling pressure of 50-60bar. At present, the widely used bottling pressure of liquefied petroleum gas is 5-15bar, the filling pressure of hydrogen cylinders on vehicles of fuel trams is 350-700bar, and the transportation pressure of gas transfer tankers of natural gas vehicle filling sub-stations is 200bar.

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