Purification Technology Q&A [030]
Thread Content
Why does the nitrogen stripping continue without interruption, even after the purification process stops and the methanol cycle remains active? Answer: Because the methanol in the cold zone still contains a large amount of carbon dioxide after the gas supply is stopped, if nitrogen is removed under these conditions, a large amount of carbon dioxide will be carried into the regeneration tower, causing overpressure in it. This will result in a significant drop in the flow rate of the feed pump for the regeneration tower, as well as a sharp rise in the liquid level at the bottom of the hydrogen sulfide concentration tower. Coalification Region Purification Technology Edition – 2017 Coal Chemical Industry “My Technical Upgrades” Contest (Large prizes available) http://bbs.hcbbs.com/thread-1786290-1-1.html Registration for Chemical Engineers – Experience Sharing Event “Learning from Others’ Experiences” http://bbs.hcbbs.com/thread-1808158-1-1.html
This prevents a large amount of gases absorbed in the methanol from entering the thermal regeneration tower after a power outage, thereby avoiding overpressure; after a certain period of time, the amount can be reduced as appropriate to prevent excessive amounts of methanol from being carried away.
Because the methanol in the cold zone still contains a large amount of carbon dioxide after the gas supply is stopped, if nitrogen is removed under these conditions, a large amount of carbon dioxide will be carried into the regeneration tower, causing overpressure in it. This will result in a significant drop in the flow rate of the feed pump for the regeneration tower, as well as a sharp rise in the liquid level at the bottom of the hydrogen sulfide concentration tower
Because the methanol in the cold zone still contains a large amount of carbon dioxide after the gas supply is stopped, if nitrogen is removed under these conditions, a large amount of carbon dioxide will be carried into the regeneration tower, causing overpressure in it. This will result in a significant drop in the flow rate of the feed pump for the regeneration tower, as well as a sharp rise in the liquid level at the bottom of the hydrogen sulfide concentration tower.
Because the methanol in the cold zone still contains a large amount of carbon dioxide after the gas supply is stopped, if nitrogen is removed under these conditions, a large amount of carbon dioxide will be carried into the regeneration tower, causing overpressure in it. This will result in a significant drop in the flow rate of the feed pump for the regeneration tower, as well as a sharp rise in the liquid level at the bottom of the hydrogen sulfide concentration tower.
Because the methanol in the cold zone still contains a large amount of CO2 after the gas supply is stopped, if nitrogen is used to replace the gas, this large amount of CO2 will enter the methanol regeneration tower, causing overpressure in it. As a result, the flow rate driven by the methanol pump drops significantly, while the liquid level in the H2S concentration tower rises sharply.
Because the methanol in the cold zone still contains a large amount of carbon dioxide after the gas supply is stopped, if nitrogen is removed under these conditions, a large amount of carbon dioxide will be carried into the regeneration tower, causing overpressure in it. This will result in a significant drop in the flow rate of the feed pump for the regeneration tower, as well as a sharp rise in the liquid level at the bottom of the hydrogen sulfide concentration tower.
Gas removes carbon dioxide from methanol, ensuring its regeneration
Because the methanol in the cold zone still contains a large amount of carbon dioxide after the gas supply is stopped, if nitrogen is removed under these conditions, a large amount of carbon dioxide will be carried into the regeneration tower, causing overpressure in it. This will result in a significant drop in the flow rate of the feed pump for the regeneration tower, as well as a sharp rise in the liquid level at the bottom of the hydrogen sulfide concentration tower.
After the gas supply is stopped, methanol still contains components such as carbon dioxide and hydrogen sulfide. Continuing to remove nitrogen not only helps to further remove carbon dioxide from the methanol, ensuring that its regeneration is of satisfactory quality, but it also generates cooling capacity as a result of the carbon dioxide removal, which reduces losses associated with the thermal regeneration of methanol and lowers the cooling load on the chillers
After the gas supply is stopped, methanol still contains components such as carbon dioxide and hydrogen sulfide. Continuing to remove nitrogen not only helps to further remove carbon dioxide from the methanol, ensuring that its regeneration is of satisfactory quality, but it also generates cooling capacity as a result of the carbon dioxide removal, which reduces losses associated with the thermal regeneration of methanol and lowers the cooling load on the chillers