【Weekly Topic】The issue of ammonia formation in raw gas
Thread Content
Most of the nitrogen in coal can be converted into ammonia during the gasification process. So, for chemical plants aimed at ammonia synthesis, if pure oxygen is not used as the gasifying agent but rather oxygen with a higher purity, could this help reduce the electricity consumption associated with air separation, as well as minimize the need for nitrogen supplementation, thereby achieving energy savings and reduced costs for the entire project? ! Everyone is welcome to discuss more. There are great rewards for those who participate, hehe!
From the perspective of gasification, H2 and N2 are required for ammonia synthesis. When oxygen-enriched gasification is used, the effective components in the syngas inevitably decrease. Moreover, different gasifiers have varying requirements regarding the gasifying agent. It is known that fluidized bed gasifiers currently use pure oxygen for gasification, with emphasis placed on factors such as gasification intensity, efficiency, capacity, and carbon conversion rate. Therefore, we cannot consider only the energy consumption of air separation; even when using oxygen-enriched oxidation, more air separation may be required. H2 is what is key for our extraction process. As a non-professional, please forgive any incorrect opinions!
On the one hand, it reduces the air separation load and energy consumption; on the other hand, it decreases the amount of nitrogen added
However, the increased complexity of the process resulting from this operation, as well as the impact of rising ammonia nitrogen levels in the raw gas on purification/low-temperature methanol washing, also need further consideration