6MD(2)110——2 hydrogen nitrogen compressor failure
Thread Content
Our factory installed a 6MD(2)110-2 hydrogen and nitrogen compressor last year, but recently a seven-segment connecting rod small head tile broke. After replacing the copper sleeve, it ran normally for an hour, but then the same fault occurred. The small head tile was locked with the crosshead pin, and the crosshead hole was worn and scrapped. The connecting rod was replaced again. After the crosshead, pin, and small head tile were tested, all oil circuits were normal, and the grinding machine was turned on for an hour. Normally, the temperature is 12 degrees, and it is normal to pressurize to 15 MPa for 30 minutes (system pressure is 23 MPa). However, after 20 minutes of operation, the temperature is abnormally high, and an emergency stop is made. It is found that the Babbitt alloy of the cross head is worn, the temperature of the entire cross head is abnormally high, and the small head tile is locked with the pin, but the connecting rod tile is normal (the oil enters the connecting rod big tile from the cross head through the small head tile). Now I am very depressed. How to separate the cross head pin from the small head tile? What exactly caused this accident? Please help heroes!!!
Haha, I saw this post once and replied to it again. The original poster mentioned seven-stage compression of the compressor. We all have six-stage compressors with the same structure. Personal analysis. The above phenomena cause high temperatures. One is the oil circuit problem, the other is the gap problem, and the third is the quality of spare parts. If the big head tile is normal, the causes of low oil pressure and oil line blockage can be ruled out. The quality of equipment spare parts generally does not vary much between batches. I think the main reason is the assembly gap. First, the gap between the copper sleeve (small head tile) and the pin is small. Second, the gap between the small head tile and the cross head is small. When the equipment is started, it is normal. When the temperature rises after running for a period of time, the expansion gap is not enough. If the phenomenon mentioned by the poster occurs, let's listen to the experts.
There is another possibility that the seventh stage is overloaded. You can check the pressure of each stage and the cylinder diameter of the seventh stage.
This post was last edited by ZZJJAA70 on 2009-6-27 19:25. Thank you for your detailed analysis. Later, after inspection, it was indeed that the thermal expansion gap of the small head tile was not enough. The second brushing of the cross head body was also caused by the insufficient thermal expansion gap. Thank you for your help!