Issues related to hypothyroidism, urgent!
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The low methane level in our company is due to Luchi; at that time the system was operating normally, with temperatures and pressures within the specified ranges. The hydrogen sulfide level at the crude gas outlet was only 40 PPm, and the carbon dioxide content in the purified gas was 0.1%. However, the sulfur content in the methanol lean stream was 57 PPm, while the inorganic sulfur level at the purified gas outlet was 0.5 ppm. What’s going on?
Our company has encountered similar situations as well; we tried many different solutions, and even suspected issues with the trays. We increase the steam. Regularly replace the system methanol. But it just doesn’t work. Later, I don’t know how it got better, but I heard it has something to do with the ammonia level in the system. You can give it a try too. It is the hydrogen sulfide that comes out at the top of the methanol regeneration tower; in front of the cooler, it is ensured that some gas flows through the bypass around the cooler. (You can give it a try to see if it works.) I don’t know. Our company still ensures a certain flow rate to be routed through the bypass. That situation has not occurred up to now. ）
Thanks to the person above! We also conducted analysis, and all of the S in the purified gas was inorganic S; we’re not sure if it’s a problem with the operation. We are analyzing the issue regarding ammonia.
3# jinwutuier should convert organic sulfur into inorganic sulfur in the transformation unit
The analysis showed no organic sulfur; it was all inorganic sulfur
Is it related to the excessive sulfur content in the purified gas whether the acid gas from the top outlet of the regeneration tower on the 2nd floor is routed through a bypass? What is the structure of your trays? I think it’s related to incomplete thermal regeneration. There are many reasons why regeneration isn’t complete, and with too little information available, it’s difficult to analyze the situation
Reply to Floor 6: As mentioned by Floor 2, it’s possible that excessive ammonia in methanol is the cause of the high hydrogen sulfide levels in the purified gas. This issue has been discussed on forums for a long time; you can search for it if you’re interested!
The purified gas must contain ammonia; it is recommended to strengthen the analysis of the ammonia content in the exhaust gas from the shift water scrubber.
It might be the decomposition of thiourea in methanol that causes this phenomenon!
Everyone is right; the ammonia content in the crude gas is above the acceptable level. We measured the ammonia content in the crude gas, and its volume fraction was as high as 30%. There was also a small amount of coal tar present. It seems to be a problem related to the gas production process. Now that we know the cause, we will know how to deal with it going forward. Thank you again to everyone for their enthusiastic discussions
It is likely that the regeneration of methanol in your system is not thorough enough, which results in excessive sulfur levels in the purified gas. If you suspect that amine compounds have accumulated in large quantities within the system, you can take samples from the bottom of the reflux tank at the top of the regeneration tower for analysis to determine whether there is an excess of ammonia