[Mechanical Equipment Technology Edition] Daily Question 201709013: Refrigerator Maintenance
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This post was last edited by YORK Industrial Refrigeration on 2017-9-15 at 10:42. Starting from now, in order to enhance communication among users, a 【Daily Question】 activity has been launched on the Mechanical Equipment Technology forum. We hope everyone will participate actively to progress and improve together! ! ! Rewards: 3 wealth for active participation, 10-15 wealth for accurate answers. This question is valid for two days; no scoring will be given after that. Question: What are the reasons for carbon buildup in the compressor shown in the image? Answer: Principle: In terms of lubricants, the oil used in the internal lubrication system of compressors often comes into contact with air at high temperatures, pressures, and oxygen partial pressures, as well as metal catalysts, in a mist form; this causes the lubricant to oxidize and deteriorate rapidly. It undergoes thermal decomposition and dehydrogenative polymerization continuously within the pipeline. Its products mix with mechanical impurities in the inhaled gas and metal shavings inside the compressor, and deposit on the surface of the engine block where they are further heated, thus forming carbon deposits. Cause: (1) Excessively high exhaust temperature ； (2) Improper oil selection, such as poor quality or excessive viscosity ； (3) Excessive oil supply ； (4) The gas compressed by the compressor is unsafe ； (5) Impurities or water mix into the oil, along with oxidation and deterioration of the oil. (6) Pipeline scaling and corrosion. ================================ Event Promotion: Petrochemical Zone – “Creative Ideas for Energy Saving” event (the second phase is in full swing) http://bbs.hcbbs.com/thread-1666758-1-1.html (Source: Haichuan Chemical Industry Forum) 2017 Coal Chemical Industry Event – “My Technical Upgrades” http://bbs.hcbbs.com/thread-1786290-1-1.html (Source: Haichuan Chemical Industry Forum)
Answer: Regarding lubricants, the oil used in the internal lubrication systems of air compressors often comes into contact with air at high temperatures, high pressures, and high oxygen partial pressures, as well as metal catalysts, in a mist form; this causes the lubricant to oxidize and deteriorate rapidly. On the other hand, as the oil continuously evaporates, the heavier components of the oil remain at the top of the piston, in the exhaust valve chamber, and within the exhaust pipes, where they are subjected to heat-induced decomposition and dehydrogenation polymerization. Its products mix with mechanical impurities in the inhaled gas and metal shavings inside the compressor, and deposit on the surface of the engine block where they are further heated, thus forming carbon deposits.
The reasons for carbon buildup in compressors are complex; primarily, the oil used in the lubrication system of air compressors comes into contact with air at high temperatures, pressures, and oxygen partial pressures, as well as metal catalysts, in a mist form, which causes the lubricating oil to oxidize and deteriorate rapidly. On the other hand, as the oil continuously evaporates, the heavier components of the oil remain at the top of the piston, in the exhaust valve chamber, and within the exhaust pipes, where they are subjected to heat-induced decomposition and dehydrogenation polymerization. Its products mix with mechanical impurities in the inhaled gas and metal shavings inside the compressor, and deposit on the surface of the engine block where they are further heated, thus forming carbon deposits.
Possible reasons include: (1) Excessively high exhaust temperature； (2) Improper oil selection, such as poor quality or excessive viscosity ； (3) Excessive oil supply ； (4) The gas compressed by the compressor is unsafe ； (5) Impurities or water mix into the oil, along with oxidation and deterioration of the oil. (6) Pipeline scaling and corrosion.
(1) Excessively high exhaust temperature； (2) Improper oil selection, such as poor quality or excessive viscosity ； (3) Excessive oil supply (4) The gas from the compressor is unsafe ； (5) Impurities or water get mixed into the oil, along with oxidation and deterioration of the oil ； (6) Pipeline scaling and corrosion. The most common reason for this is excessive fuel supply.
Carbon buildup is mainly caused by prolonged oiling of the cylinders or impurities in the compression medium. It is highly harmful, as it can accelerate the wear of piston rings and support rings and shorten their service life.
Carbon buildup is mainly caused by prolonged oiling of the cylinders or impurities in the compression medium. It is highly harmful, as it can accelerate the wear of piston rings and support rings and shorten their service life.