[Q&A Question 347] 12/31/2017
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【Q&A Question 347】December 31, 2017: Treatment for mild carbon deposition on the conversion catalyst: ① After informing the workshop supervisor, contact the dispatch team, reduce the load, and increase the hydrogen supply as well as the water-to-carbon ratio, so that the conversion catalyst can operate under reducing conditions for several hours. ②Identify the root cause of catalyst carbonization and take targeted measures. ③The PSA unit also reduces its operation load, and hydrogen supply is stopped if necessary. ④The CO2 content at the converter gas outlet is analyzed every half hour until it stabilizes at a lower level. ⑤If the carbon burning effect from the above measures is not noticeable, prepare to shut down the operation and replace the catalyst. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) For management purposes, if you need to view content from a few days ago, please access it through the summary post below. 2017 Q&A Summary Thread (updates have begun) https://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) https://bbs.hcbbs.com/thread-1657794-1-1.html 2017 Daily Image Summary Thread https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160 2017 LNG Version Daily Question Catalog https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162 2016 Q&A Summary Thread (updates completed) https://bbs.hcbbs.com/thread-1597792-1-1.html
For mild carbon deposition on the conversion catalyst, this can be addressed by reducing the amount of feedstock (increasing the water-to-carbon ratio) in order to eliminate the carbon buildup.
Treatment is carried out by reducing the amount of raw material (increasing the water-to-carbon ratio) to eliminate carbon deposits
①After notifying the workshop supervisor, contact the dispatch team, reduce the load, and appropriately increase the hydrogen supply and the water-to-carbon ratio, so that the conversion catalyst can operate under reducing conditions for several hours. ②Identify the root cause of catalyst carbonization and take targeted measures. ③The PSA unit also reduces its operation load, and hydrogen supply is stopped if necessary. ④The CO2 content at the converter gas outlet is analyzed every half hour until it stabilizes at a lower level. ⑤If the carbon burning effect from the above measures is not noticeable, prepare to shut down the operation and replace the catalyst.
1 After notifying the workshop supervisor, contact the dispatch team, reduce the load, and appropriately increase the hydrogen supply and the water-to-carbon ratio, so that the conversion catalyst can operate under reducing conditions for several hours. 2 Identify the root cause of catalyst carbonization and take targeted measures. The 3 PSA units also have their load reduced, and hydrogen supply is stopped if necessary. 4 Analyze the CO2 content at the converter gas outlet every half hour until it stabilizes at a lower level. If the carbon burning effect is not significant after implementing the above measures, preparations should be made to shut down the operation and replace the catalyst.
Reduce the processing volume and carry out carbon production using a high water-to-carbon ratio.
Treatment is carried out by reducing the amount of raw material (increasing the water-to-carbon ratio) to eliminate carbon deposits
Treatment for slight carbon deposition on the conversion catalyst: Cause: 1) The actual water-to-carbon ratio is too low, resulting in thermodynamic carbon deposition. 2) The catalyst is unevenly packed or crushed. 3) The new catalyst was fed without being sufficiently reduced, resulting in low catalyst activity. 4) The conversion catalyst has poor anti-coking performance and suffers from severe potassium loss. 5) The catalyst has been severely deactivated or sulfur-poisoned. 6) Insufficient hydrogen supply or fluctuations. 7) Significant fluctuations or excess levels in operating temperature or pressure. Phenomenon: 1) The pressure difference at the inlet and outlet of the furnace tube increases. 2) The surface temperature of the furnace tube rises, resulting in hot spots or mottling. 3) The methane content in the converted output increases. 4) The furnace temperature is normal, while the temperature at the outlet of the conversion tube is on the high side. Treatment: 1) Reduce the load, appropriately increase the hydrogen supply and the water-carbon ratio, so that the conversion catalyst operates under reducing conditions for several hours. 2) Identify the root cause of catalyst coking and take targeted measures. 3) The PSA unit should also reduce its operation load, and hydrogen supply should be stopped if necessary.
Treatment is carried out by reducing the amount of raw material (increasing the water-to-carbon ratio) to eliminate carbon deposits
Increase the water-carbon ratio for treatment in order to eliminate carbon deposits
The method of reducing the amount of raw materials (increasing the water-to-carbon ratio) is used to eliminate carbon deposits.