Reasons for the corrosion of the five-stage valve plates in carbon dioxide compressors
Thread Content
The last edit to this post was made by 1025199692 on 2010-6-21 at 13:00. The material of the five-stage valve discs in the carbon dioxide compressor is 3Cr13, and the sealing surfaces of the imported valve discs have suffered corrosion
Is it the valve disc for the inlet or outlet valve?
Reply to 2# jinpingwang_69: If it’s imported, is it because the water separation effect of the previous stage separator isn’t good?
In such cases, if there is no problem with the host’s cooling water system, it is usually due to poor drainage performance of the separator or the operator failing to drain it on time. Now that summer has arrived, if the separator’s capacity is insufficient, it may be necessary to modify it or replace it with a different type of separator; in addition, operators are required to drain water regularly.
Reply to 4# jingling8010: Water should not cause corrosion to stainless steel
Water does not cause corrosion, but gases can dissolve in water to form corrosive agents.
When there are impurities in the water, corrosion does occur more severely.
It is noted that the original poster also has another post discussing the corrosion of the five-stage piston rings in CO2 compressors; overall, it seems to be a problem with drainage in the previous stage – incomplete separation of gas and liquid leads to CO2 dissolving in water to form carbonic acid, thereby causing corrosion of the compressor’s internal components. As mentioned on the fourth floor, attention should be paid to drainage in summer, as the temperature of the circulating water is high; this results in less moisture condensing at the CO2 inlet and in the low-pressure section, which is then carried into the high-pressure section. Therefore, the frequency of drainage in the high-pressure section should be increased.
The four-stage air intake system did not completely separate the water, which led to a reaction between carbon dioxide and water to form carbonic acid; this caused corrosion of the carbon steel pipes.
If carbon dioxide gas contains water or is not a dry gas, the separation efficiency of the inlet separator is poor! ! Check the separator! !
This post was last edited by 1025199692 on 2011-3-24 12:46; with no changes in the operations, there was no corrosion last summer. Could it be that the carbon dioxide gas ahead contains other impurities, such as organic sulfur and inorganic sulfur?