Biogas purification process

What is the Air separation unit instrument cluster and what is the relationship between transmitters, display tables, regulators, and membrane control valves?Air separation unit.1 g potassium dichromate or 2 g sodium nitrite can be added to each liter of water (not suitable for nonferrous metal degreasing); due to the toxicity or explosion of degreasing agent, attention must be paid to prevent poisoning and formation of explosive mixture. In alkaline cleaning, the pipeline with more oil stains is heated to 60-90 ℃ with 10% sodium hydroxide solution, then neutralized with 15% nitric acid and washed with clean water.Air separation unit.From the vaporization temperature (saturation temperature) of liquid oxygen, if the liquid oxygen surface is too high, the greater the static pressure difference between the upper and lower liquid oxygen surface, the higher the average pressure of liquid oxygen and the corresponding saturation temperature. In order to maintain the heat transfer temperature

What is the role of the subcooler of the distillation column?