Wastewater stripping cost reduction project
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The side-line ammonia extraction process is adopted with the aim of reducing steam operation costs. The initial idea is to treat the ammonia extraction condensate separately, through staged treatment. The gas drawn off from the side line accounts for about 50% of the stripping load in the stripper, and constitutes 50–60% of the total heat supplied. As the extraction ratio increases, the quality of the water at the bottom of the tower improves significantly; however, the steam consumption per unit volume and the amount of condensate produced at the side line also increase, along with the amount of ammonia circulated in the circulating liquid. When the extraction ratio exceeds a certain value, the large amount of ammonia in circulation causes the ammonia peak inside the tower to widen. Despite high stripping intensity within the tower, the quality of the purified water deteriorates, and steam consumption also increases significantly. How to ensure the water quality at the bottom of the tower while reducing steam energy consumption is a current challenge. Please, fellow sailors, share your thoughts!
Quality and energy consumption are always in conflict; the more H2S and ammonia nitrogen is removed from water, the greater the energy consumption； You can’t have both fish and bear paws. Typically, the approach is to find a balance between two aspects. To reduce energy consumption, it is recommended to focus on improving heat transfer in the reboiler and using more efficient trays. Ammonia extraction via the side line does not reduce energy consumption. The purpose of wastewater stripping is to separate H2S and NH3; extracting ammonia via a side stream constitutes a secondary separation process, which is less energy-intensive than primary separation.
It would be great to have detailed discussion materials