Increase the ammonia content at the outlet of the synthesis tower
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According to available information, some manufacturers are currently installing a device between the synthesis tower and the waste heat boiler, which can increase the net yield of synthetic ammonia by 4–5 percentage points. Could anyone who works for a company that uses this device please share information on its performance? Can the ammonia net value really be increased? Thank you! :handshake
Personally, I think it might be necessary to add another synthesis tower. This solution was considered during the modification of the synthesis circuit, but in the end, the technology for modifying the internal components was adopted.
According to reaction kinetics, when the ammonia synthesis reaction reaches equilibrium, adding another synthesis tower will not increase the net yield of ammonia unless the product is removed.
There is a type of \"ammonia solvent\" in the synthesis tower; as it flows down from above, it dissolves most of the ammonia. This solution accumulates at the bottom of the tower and is then led out of it. As the pressure decreases, the ammonia is released in gaseous form, while the ammonia solvent remains in liquid state and does not evaporate to mix with the ammonia. After pressurization, it is sent back into the tower to absorb ammonia. It suffers little loss, as it is already a liquid; therefore, applying pressure requires little compression work. In this way, the vast majority of hydrogen and nitrogen can be converted into ammonia and removed. A small amount of hydrogen, nitrogen, and inert gas are removed from the tower together for separation. It is then sent back to the synthesis tower to produce ammonia. This method is highly efficient, as well as extremely energy- and compression-work-saving. It’s your patent.
I guess it’s a low-temperature synthesis tower. A low-temperature catalyst is used, and synthesis continues at low temperatures, resulting in a relatively high yield.