Transformed gas desulfurization system
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This post was last edited by 654262293 on 2016-7-25 09:02. In our factory’s medium-pressure conversion system (2.2 Mpa, full low-pressure conversion), is plant oil added frequently to the medium-pressure dehydration system in order to prevent liquid loss from the system? Why is this? Is there a better way?
Use a degassing system with vegetable oil, along with the tannin method; the main purpose is to eliminate foam and make the foam in the regeneration tank more susceptible to flotation. In fact, this approach was first proposed by our company, but we no longer use it nowadays. During winter maintenance and when restarting the system for regeneration, high levels of dissolved carbon dioxide in the system cause foam to form, leading to poor conditions in the surrounding area. Adding oil helps to reduce the thickness of the foam. It actually serves to eliminate foam.
We have to add it now; if we don’t, the pressure difference will increase once fuel is added. Moreover, the sulfur foam isn’t very good – there’s no suspension layer. Is there any better way?
It’s due to poor regeneration; what about the components of the desulfurization liquid, the temperature, and the distributor inside the tower? The circulation rate of the lean liquid during load reduction cannot be decreased. In our old plant, the packing in the desulfurization unit hasn’t been cleaned for around 10 years, yet the resistance hasn’t increased.
Do you have any better ways to control it? Any advice?
Do you have any better ways to control it? Any advice?
Upload your process data; the more comprehensive, the better.
Total alkalinity: 0.06, Na2CO3: 0, NaHCO3: 4.62, pH: 7.5, NaS2O3: 135.18, Na2SO4: 28.41, PTS: 251.4, KCA: 0.8, potential: 29, NaSCN: 65, suspended sulfur: 1.6, HS-:
Based on the data, the content of sodium carbonate is too low; the pH value should be between 8.2 and 9.0. The level of sodium thiosulfate is high, and the amount of suspended sulfur also exceeds the standard. Using caustic soda to increase the sodium carbonate content is a better approach, but it must be added using cold water; otherwise, safety accidents can occur and people may get burned. Based on years of operational experience, more carbon dioxide dissolves in the medium-pressure system, making it difficult to adjust the pH value. It’s not clear whether switching to a method using tannin and vanadium pentoxide would be better, as the foam produced by the tannin method has greater affinity and facilitates flotation. However, the air volume supplied to the regeneration injector cannot be ignored either. It’s necessary to find a desulfurization method that suits one’s own process. What about efficient desulfurization agents? Solutions such as 888 and PDS may appear clear, but their reaction mechanisms differ from those of tannin. The corrosion problem associated with medium-pressure desulfurization cannot be ignored either; that’s all I can say on this topic.