| 摘要 |
A process for producing ammonia synthesis gas from a hydrocarbon-containing feedstock, the process comprising a primary steam reforming and optionally including a pre-reforming, a second reforming step which is carried out with a stream of an oxidant, thus obtaining a synthesis gas comprising hydrogen, carbon monoxide and carbon dioxide, and a treatment of said synthesis gas including shift of carbon monoxide and subsequent removal of carbon dioxide, wherein said second reforming step is carried out by using oxygen or enriched air comprising at least 50% oxygen, the shift of the synthesis gas includes a step of high-temperature shift with an iron-based catalyst and at a temperature greater than 300 °C, and the global steam-to-carbon ratio of the front end is 2.6 or less; a corresponding plant and a method for revamping a front-end of an ammonia plant are also disclosed. |
