A question about ammonia-based flue gas desulfurization
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In ammonia-based desulfurization, does a high dust content in the boiler have an impact on the crystallization of sulfuric acid?
In ammonia-based desulfurization, the dust content does not affect the desulfurization efficiency, but it impacts the normal operation of the system, leading to equipment wear and blockages as well as affecting crystallization and product quality. When the sulfur content is around 1%, a dust concentration of less than 50 mg/Nm3 has no impact on the desulfurization system. Reaching 100 mg/Nm3 has a slight impact on the system; higher concentrations, on the other hand, have a greater effect on the stable operation of the desulfurization system. It is necessary to clean the dust deposits promptly to prevent blockages in pipes, mist eliminators, and other components.
It has no effect on crystallization, but it causes severe blockages in the pipes, which must be cleaned promptly.
Thank you all. The dust level in the current feasibility study plan can reach 700 mg/Nm3, which is really too high:L
That member who works in the marine industry has a technical description of the ammonia-based desulfurization process; please upload it. Thank you very much!
Soot in flue gas has an impact on desulfurization; primarily, because soot is essentially insoluble in water, its accumulation can lead to blockages in equipment and piping systems. Moreover, when soot enters the by-product sulfuric acid, it results in a poor color and low nitrogen content in the sulfuric acid, severely affecting its marketability. Since ammonia-based desulfurization is not a disposal method but rather a recovery method, it is necessary to minimize impurities such as dust in the flue gas in order to ensure the proper operation of the system and the high quality of the by-product sulfuric acid.
From a crystallization perspective, the presence of dust has a significant impact on the crystallization of sulfuric acid an. Dust particles act as nuclei during the crystallization of sulfuric acid anhydride. In many crystallization processes, the presence of fine dust or crystals tends to accelerate the crystallization process. Moreover, the crystals formed are relatively dense. The quality of crystals is related to process control. The presence of dust not only affects the purity of sulfuric acid an but also the form of the crystals.
The impact is minimal; it mainly relates to the quality of the by-products and equipment wear
It has little impact on the crystals of sulfuric acid an itself, but if the iron ion concentration is too high, it will result in finer crystals, affecting product quality； Furthermore, high dust levels affect the color of the AN sulfate product and reduce its nitrogen content.
I have the same questions and the same concerns as the original poster. In my opinion, the ammonia-based desulfurization process has many shortcomings when it comes to ammonium sulfate crystallization; there are numerous problems and no effective solutions； How can problems such as corrosion, scarring, and pipe blockages be solved fundamentally?
I don’t know much about this technology, so I’m approaching it with a learning attitude to learn from experts~