Does the Shell gasification-based ammonia synthesis plant require CO2 to replace nitrogen?
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Is replacing nitrogen with CO2 in the gasification unit beneficial for the ammonia synthesis plant? Does the use of nitrogen have an adverse effect on the liquid nitrogen washing device?
It doesn’t seem to be of much help for ammonia synthesis, but it offers many benefits for methanol production
When using CO2 to transport pulverized coal for methanol production, it can be removed during the low-temperature methanol washing process; whereas when nitrogen is used to transport pulverized coal, nitrogen being an inert gas is not favorable for methanol production, but it has little impact on ammonia synthesis!
The advantage of using CO2 for coal transportation compared to nitrogen is that, at a gasification pressure of 40 atmospheres, using nitrogen requires cooling with liquid nitrogen in the liquid nitrogen washing stage, whereas using CO2 eliminates the need for such cooling.