Problems in the double-tower steam stripping process for desulfurization and denitrification of wastewater
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I have been recently simulating the process of using twin towers for pressurized steam stripping to remove hydrogen sulfide and ammonia from wastewater. After researching some materials, I added a condenser at the top of the ammonia removal tower; the liquid phase is then recycled back to this tower. As a result, ammonia is removed. During the simulation, after the gas phase at the top of the ammonia removal tower was condensed, all of the ammonia dissolved in the liquid phase, and no ammonia gas emerged – this is the first problem. The second problem is: why is recycling necessary in the ammonia removal tower? If recycling occurs, the ammonia dissolves back in the water, thereby increasing the ammonia concentration in the bottom of the tower ? ? Please help, experts!
I’m not very familiar with this process, but no ammonia is being extracted from the top of the deammonification tower; it’s likely that the temperature setting of the first-stage condenser is too low, resulting in over-cooling. As for the second question, there is reflux to increase efficiency and improve the purity of ammonia at the top of the tower.