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Emergency analysis of air compressor

time:2017-09-25 15:27:32source:Ziqi compressorauthor: 赵疆昆Clicks: 0
the occurrence of accidents and determine the handling
At 21:00 on March 13, 2009, during the normal production process, on-duty position staff found that the pressure of air compressor decreased

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1 the occurrence of accidents and determine the handling

At 21:00 on March 13, 2009, during the normal production process, on-duty position staff found that the pressure of air compressor decreased slowly from 0.269MPa to 0.238MPa, and the pressure drop of oil filter increased from 0.08MPa to 0.12MPa. However, Not to the alarm value (0.2MPa), after switching the spare pump, the oil pressure stabilized at 0.24MPa, but the oil filter pressure rose slightly to 0.13MPa. Confirmed the scene of the oil supply system, oil supply lines and air compressor The site did not leak after contact with the inspector, inspector asked to adjust the pump pressure, but no change in oil pressure, when the inspector on the 14th to the scene found the fuel level is very low, the oil level is only pumping than the pump A few centimeters high, confirm the air-cooled tower drain side of the water sample taken after the water sample, determine the lubricant has been a large number of leaks to the circulating water.

Due to the oil supply system all pipes and equipment were not found around the signs of leakage, initially determine the possibility of oil cooler leakage the most. Air separation system requires absolutely no oil, oil into the air separation system and liquid oxygen or high concentrations of oxygen contact easily explosive phenomenon, in order to prevent the water through the air-cooled tower into the air-cooled air separation system (water and raw air in the air-cooled tower directly Contact heat exchange) and lead to serious accidents, the workshop immediately stop the oxygen machine, taking into account the oxygen generator circulating water system and oxygen sharing, in order to prevent the accident to expand, stop the oxygen machine, stop circulating pump. And the circulating water tank drainage, cleaning, degreasing. Workshop immediately after the development of repair programs:

(1) Drain and clean the circulating water tank, then refill the water tank, add the degreasing agent, and start the pump to degrease and drain all circulating water systems.

(2) Remove the oil cooler cover, the oil cooler to suppress, find the drain pipe bundle and blocked with plug.

(3) The oil discharged from the oil drain port is a mixture of oil and water. Check if the air compressor bearing is damaged due to poor lubrication.

In the process of repair, the workshop is also carefully analyzing and judging the possible impact of the accident. How to ensure that the long-term safe operation of the three oxygen plant air separation units is the key to the successful completion of the emergency repair work should be considered Whether the air cooling system filler to thoroughly clean. According to the analysis of the on-site situation, the workshop believes that if all the cooling water contact parts are cleaned, it takes 1 ~ 2 weeks or even longer, which will have a huge impact on the whole plant production. After the air passes through the air cooling tower, it enters the molecular sieve to be purified System adsorption of water and CO2 and some hydrocarbons, after oil spills, air pollution after the sieve did not find excessive CO2 content, you can determine the normal molecular sieve, air-cooled tower without water through the molecular sieve, you can determine: a longer time of oil spills Did not enter the air separation unit (at least not through the molecular sieve, molecular sieve adsorption stage was adsorbed). Through the above analysis, the workshop to determine: a lot of oil spill did not enter the air separation plant, drained oil circulating water, the new water will make the water content of oil compared to the previous trace, on-site water treatment experts believe that at the same time The degreaser will in turn remove most of the residual grease. Therefore, a very small amount of grease can not be concentrated into the air separation plant, air separation system will not affect the normal production, laboratory analysis can be strengthened in the production process, abnormal and timely discharge of the main cold liquid. Through careful analysis, decided to implement the original repair program.

After examination, air compressor bearing at all levels in good condition, no obvious signs of wear, but the bearing surface water phenomenon Air compressor oil cooler tube bundle has a rupture, is caused by a large number of main causes of oil leakage.

2 reason analysis

(1) One of the cooling water pipe bundles breaks due to the long service life (12 years) of the compressor oil cooler tube bundle, which is the direct cause of the large amount of lubricating oil leaking into the circulating water.

(2) Site staff did not follow the standard operation site inspection requirements, did not promptly find the tank level drop.

(3) The inspector did not realize the seriousness of the problem did not go to the scene to deal with the problem in time, but to orally command the operator to adjust the hydraulic pressure.

(4) In the last year's annual repair did not suppress the oil cooler leak test, missed the oil cooler tube may find the opportunity to leak.

(5) The oil cooler has certain quality problems. During the second year of initial use of the equipment, it was found that there was a tube bundle leakage.

3 Conclusion

The equipment accident caused a great impact on the factory production, downtime up to 22h, if we can find out the problem in advance, the time and mode of handling the failure remain basically unchanged, but the risk of accidents increases. After careful analysis and summary of the accident, the workshop recognized the loopholes in management and adopted a series of targeted corrective measures to provide management and institutional support for the timely detection and handling of problems in the production process in the future Protection.

  

 

 

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