Discussion on membrane separation, pressure swing adsorption, and deep (regular) cryogenic technologies ----- compressors

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Discussion on membrane separation, pressure swing adsorption, and deep (regular) cryogenic technologies ----- Compressors: 1. What is the function of compressor vanes and what can be said about them? Thank you. 2. What are the reasons for the decrease in pressure between stages in a centrifugal compressor? 3 Is it suitable for use as an external compressor in air separation units in the coal chemical industry? 4 Why is a lubricating oil pressure low-level protection device required for compressors? 5 Compressor issues 6 How do screw-type refrigeration compressors generate cold? 7 Compressor flow rate problems 8 Compressor calculation issues 9 Are there variable-frequency centrifugal air compressors? 10 Inter-stage cooling method of the main air separation compressor 11 Can centrifugal air compressors reduce power consumption by lowering the pressure setting? 12. How is the size of the buffer tank after the 13 cyclic compressor and the pressure swing adsorption compressor determined? 14. What are the functions of the backflow valve and the start-up assist valve on a single-stage refrigeration compressor? 15 How long should the straight pipe at the inlet of a general compressor be? 16 Selection of air compressors. 17 Who knows the structure and working principle of integral gear-type compressors? 18 Turbine compressors. 19 Which type of molecular sieve is suitable for use in heat-free air compressors? 20 What load margin is generally appropriate for centrifugal compressors in ammonia synthesis cooling stations? 21 Do ethylene refrigeration compressors operate in automatic mode? 22 Do the compressors in air separation units need to use explosion-proof motors? 23 Is it more cost-effective to use separate refrigeration or ammonia compressors for air separation in an ammonia synthesis plant? 24 Regarding screw refrigeration compressors. 25 What is the proper sequence of pressure swing adsorption compressors and gas-water separators?