Weekly Topic: FAQs on Centrifugal Compressors? Please participate! 2016.06.26--07.03

Thread Content

For the methanol section’s weekly topics, we encourage all members to participate actively. The purpose of this activity is to review the knowledge we have already learned; through answering questions, we can improve our knowledge, broaden our understanding, reinforce what we already know, recall what we have forgotten, and deepen discussions on controversial topics, thereby progressing together. We welcome any opinions or suggestions you may have; please feel free to share them so that we can work together to improve this methanol section and create a better platform for communication for everyone! ! There will be a reward for everyone who answers; great content is available upon reply. Weekly Topic: FAQs on Centrifugal Compressors? Please participate! 2016.06.26--07.03 1. What are the factors that cause surge in centrifugal compressors? Answer: The reasons for surge occurring during actual operation are roughly as follows: 1) The gas flow rate is low, entering the surge region. 2) The gas outlet pressure is too high, entering the surge region. 3) Surge caused by improper operation. 4) Surge is caused by damage to mechanical components. 5) Additionally: a sudden drop in rotational speed, significant fluctuations in the temperature and specific weight of the compressed medium, as well as low intake pressure, can also cause surge. 2. How to eliminate surge in a centrifugal compressor? Answer: When surge occurs, the flow rate should be increased immediately (by opening the outlet vent valve or the bypass valve between the inlet and outlet – the anti-surge valve – to reduce the outlet pressure) in order to eliminate the danger. Afterwards, the cause of the surge must be identified and addressed, and the machine should be checked for any damage before normal operation can be resumed. If it is necessary to maintain pressure in the system, the speed should be increased appropriately after opening the anti-surge valve to allow gas to flow back, so that the outlet pressure returns to its original level. 3. What are the important indicators of lubricating oil and its functions? Answer: The parameters of lubricating oil include viscosity, moisture, acid value, flash point, pour point, mechanical impurities, oxidation resistance, ash content, etc ； Its functions include lubrication, cooling, flushing, dust and corrosion protection, corrosion and vibration mitigation, load relief, and rust removal.