What is the appropriate hydrogen-to-nitrogen ratio for ammonia synthesis? What is the appropriate ratio between the amount of syngas and recycled hydrogen?
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Currently, our production conditions are as follows: the inlet volume for synthesis is 31,000 Nm3/h, the recycle hydrogen level is maintained at 66–70%, and the temperature at the fourth measurement point on the second layer of the synthesis tower is higher than that at the third measurement point. Then, after the high-pressure compressor was shut down for maintenance recently, the syngas volume dropped to 24,000 Nm3/h, while the recycle hydrogen level remained controlled at 66–70%. However, the third temperature measurement point in the synthesis tower exceeded the fourth one. In other words, previously it was point 4 whose temperature was high; now it’s point 3 whose temperature has risen. ” So, I would like to ask everyone: 1: What is the appropriate hydrogen-to-nitrogen ratio for ammonia synthesis? 2: What is the appropriate ratio between the amount of syngas and recycled hydrogen?
1. The phenomenon described by the poster has little to do with the question raised. 2. The optimal hydrogen-to-nitrogen ratio is generally slightly less than 3, as determined by the catalyst manufacturer. 3. The specific range for hydrogen content is also influenced by the amount of inert gases present
It seems I don’t understand the principle of the ammonia synthesis process