Why is oxygen added to the high-pressure urea system, and what is the appropriate amount?

2017-09-20View Original

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Why is oxygen added to the high-pressure urea system, and what is the appropriate amount?

Reply #22017-09-20

1. Corrosion issues in the high-pressure urea system equipment: In the CO2 stripping urea process, the materials used for high-pressure system equipment are generally 316MOD and 25-22-2. In terms of design, air with a volume fraction of 4% to 6% is generally added to the raw CO2 gas; this air is used to supply the oxygen required for removing hydrogen (to meet explosion prevention requirements) as well as for preventing corrosion in high-pressure equipment. It is necessary to ensure that the volume fraction of oxygen in the CO2 before it enters the stripping tower is 0.6%.

Reply #32017-09-20

The materials used for the high-pressure synthesis tower are 316mod and 25-22-2. Oxygen is added to reduce corrosion. The volume fraction of oxygen is 0.6%.

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