Can ammonia-based desulfurization solve the problems associated with catalytic flue gas desulfurization (alkaline method)?
Thread Content
Can ammonia-based desulfurization solve the problems associated with catalytic flue gas desulfurization (alkaline method)? There are cases where the ammonia method is used for desulfurization of flue gases from catalytic cracking; I would like to share some experiences in this regard. Although this method can effectively address the issue of saline wastewater discharge, why hasn’t it been widely adopted? What are the problems still present?
You can take a look at Taishan Group’s ammonia-based desulfurization and dust removal technology. The problem might be related to the storage of ammonia
How is the discharge of concentrated brine addressed? How to control the ammonia nitrogen level in wastewater discharge?
The ammonia method has far more problems. 1. Ammonium sulfate in its dissolved form is an acidic salt with strong corrosive properties; therefore, the desulfurization tower needs to be lined with PP plates. However, the fixing points of these PP plates can leak, leading to corrosion of the tower itself as well as its cement base. The components inside the tower should be made of duplex stainless steel 2025, which is quite expensive. 2. The escaped ammonium sulfate can form acid rain, which corrodes the insulation sheeting on the pipeline of the equipment. Tin roof. A wet electrostatic precipitator is required. 3. The crystal units of ammonium sulfate often have problems. 4. ……It’s time to get off work; I’ll fill in the details another day.
The 316L stainless steel plates used for lining our desulfurization tower
316L is not resistant to chlorine corrosion, which is the enemy of all stainless steels whose numbers start with 3. The upper limit for chlorine resistance in 316L is around 250PPM; in the case of the ammonia method, the chloride ion concentration in the slurry can exceed 10,000. In the ammonia process, PP plates are used as linings; those with more resources opt for double-layer stainless steel. The 316L lining won’t last a few months, I guess.