Seeking guidance on calculating the ammonia-to-carbon ratio in feedstock
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Our plant wants to calculate the ammonia-to-carbon ratio of the feed materials. On the DCS, this ratio (on a molar basis) should be displayed based on the amount of feed. We would like to ask everyone for the method of calculation: the unit for ammonia is tons per hour, while the unit for carbon dioxide is standard cubic feet per hour. How can we calculate the ammonia-to-carbon ratio of the system’s feed?
Based solely on the feed carbon dioxide, it is not possible to calculate the ammonia-to-carbon ratio, as different conversion rates result in varying amounts of carbon dioxide and ammonia in the return stream, that is, in the ammonium methane solution; therefore, it is also necessary to know the amounts of carbon dioxide and ammonia present there
It should be possible to develop a calculation formula for the feed ammonia/carbon ratio. The quantities must be converted into molar units; personnel working on the DCS should be able to handle this. The theoretical N/C ratio for urea is 2; however, due to technical losses, the actual feed ratio is around 2.05.