The balance pipe of the high-pressure cylinder of the carbon dioxide compressor is frosted; please help analyze the cause.
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This post was last edited by hbspider on 2018-4-20 at 13:00. The balance pipe of the high-pressure cylinder in the carbon dioxide compressor is frosted; please experts help analyze the cause. The maintenance is complete; it was carried out in accordance with the planned tasks: 1. Replaced the seal on the balance disc comb teeth; 2. Directed the gas from the balance tube to the first-stage outlet of the low-pressure cylinder; 3. Inspected the thrust bearings. First, the thrust bearings were inspected, and obvious carbon buildup was found; thereafter, that carbon buildup was removed and replacements were installed. Next, the drive end cover was opened to inspect the seal of the balance disc’s comb teeth; it was found that sulfur accumulation inside the comb teeth was severe, and the gas passages were heavily blocked. These issues were then resolved by cleaning them and replacing the relevant components. Finally, the balance tube was modified; after checking the seal of the balance disc comb teeth, it was found that the gas passage was blocked, preventing a large amount of leaking gas from being discharged to the intake side in time, which in turn caused high axial forces. As for the reason for frosting in the balance tube, it is due to the narrowing of the gas passage and the resulting cooling effect from gas throttling. Here is the image:
It is possible that the temperature at the outlet of the inter-stage cooler between the low-pressure cylinder and the high-pressure cylinder is too low~~~~
This possibility is not very high; due to the circulating water, the temperature at the water cooling outlet is two to three degrees higher than the designed value.
Most likely, the clearance in the compressor’s balance drum is too large (or there are other short-circuit leakage paths), which allows high-pressure carbon dioxide from the downstream side to flow to the other side of the balance drum (the side of the balance tube), where it expands, absorbs heat, and does work~~~~~~~~~
Affected by environmental temperature and humidity, as long as there is no significant change in the vibration of the displacement axis, it can be ignored.
This reason is quite likely; what is observed at present is a relatively high main drive voltage.
Currently, the one that is primarily recommended has a higher wattage, around the alarm threshold.
While keeping close watch, it is possible to slightly reduce the oil supply to other lubrication points by -3%~5% (as long as the temperature rise at those other lubrication points remains unchanged)~~~~ in an effort to extend operation time as much as possible.
While closely monitoring shaft displacement during operation, it is still necessary to first prepare spare parts for the balance drum seals, as well as related mechanical, electrical, and instrumentation spare parts, and to complete all the preparatory work.
It seems that everyone does it this way: the production workload is heavy, and if maintenance is required, it takes too much time; in such cases, the high-pressure cylinder has to be disassembled.
The shaft displacement is currently normal; a major overhaul is planned.