What are the functions of oxygen compressors?

Main control functions of oxygen compressor: The control functions of oxygen compressor mainly include anti-surge control, compressor start\/stop interlock control, auxiliary equipment start\/stop interlock control, and real-time display and alarm of important process parameters. Anti-surge control When the compressor outlet flow and pressure do not match, that is, when the flow is low or the pressure is high, the compressor will surge. The oxygen compressor anti-surge control includes inlet pressure regulation, inlet flow regulation, first-level reflux regulation and 3-level reflux regulation.

1. Inlet pressure regulation The inlet pressure adopts conventional PID regulation, the regulator is PIC 3922, and the inlet pressure regulating valve PCV 3922 is used to complete it.

2. Inlet flow regulation The inlet flow is regulated in sections, which is completed by the main vent regulating valve FCV1 3920 and the bypass vent regulating valve FCV2 3920 in front of the machine. The regulating parameter is the flow in front of the oxygen compressor, and the measured value has temperature and pressure compensation.

3. Reflux regulation The reflux regulation is carried out in sections, which is completed by the first-stage reflux regulating valve PCV1 1510 and the third-stage reflux regulating valve PCV3 1510. The regulating parameters are the flow rate before the oxygen compressor and the pipe network pressure, and the two are PID-calculated separately.

When the network pressure is normal, the output of the flow regulator FIC 3921 in front of the machine is used as the loop output; when the network pressure exceeds a certain value, the output of the network pressure regulator PIC 1510 is used as the loop output; the gradient selector can select different inputs according to certain conditions. The process of switching from one input to another is exponentially gradual and requires 5 times the time constant. The time constant can be set by the programmer. The switching condition of gradient selectors 1 and 3 is that the network pressure exceeds a certain set value; the switching condition of gradient selector 2 is that the oxygen compressor is unloaded (vented through the stop valve PV1536). The purpose of the loop output returning to the gradient selector 1 is to achieve disturbance-free switching. The purpose of the compressor is to use compressed air as power to drive various pneumatic machinery, pneumatic Tools, the exhaust pressure of the compressor is 0.70.8MPa, which is used to control instruments and their automation devices; vehicle braking, door and window opening and closing; mixing in the pharmaceutical industry and brewing industry; weft sand blowing in jet looms; starting large and medium-sized diesel engines; high-pressure blasting coal mining; launching certain weapons in the defense industry, the sinking and floating of submarines, the shooting and driving of torpedoes, and the salvage of sunken ships. Compressed air is used for refrigeration and gas separation. Gas is compressed, cooled, expanded and liquefied, and is used for artificial refrigeration (freezing, refrigeration and air conditioning), such as ammonia or Freon compressors. This type of compressor is usually called a "refrigerator" or "ice machine".

In addition, if the liquefied gas is a mixed gas, each component can be separated in the separation device to obtain various gases of qualified purity. For example, after the air is liquefied and separated, pure oxygen, pure nitrogen and pure other rare gases can be obtained. At present, in the petrochemical industry, the separation of its raw gas - petroleum cracking gas is first compressed, and then different cooling temperatures are used to separate the components. Compressed gas is used for synthesis and polymerization. In the chemical industry, gas compression to high pressure is often conducive to synthesis and polymerization. For example, nitrogen and hydrogen synthesize ammonia, hydrogen and carbon 2 oxide synthesize methanol, carbon 2 oxide and ammonia synthesize urea, etc. For example, in the chemical industry, the polyethylene industry has developed rapidly, and the polymerization pressure range used is very wide, some even reaching 3200kg\/square cm. Compressed gas is used for oil hydrorefining. In the petroleum industry, hydrogen is heated and pressurized by artificial means and reacted with oil to crack the heavy components of hydrocarbons into light components of hydrocarbons, such as the lightening of heavy oil, lubricating oil hydrorefining, etc. The compressor used for gas transportation and pipeline gas transportation is easy to transport gas after pressurization.