How to control the ammonia smell during dry ammonium production?
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In the caustic soda production process, ammonium chloride is produced as a by-product through salting out and cold crystallization; after centrifugation, the moisture content is around 6-7%. At present, most companies carry out further processing to produce dry ammonium, with sulfurized bed drying being the main method used. The moisture content in dry ammonium is ≤0.5%, and hot air is used to remove the moisture; ammonia molecules are primarily removed during this stage. The ammonia content in this portion of the gas is generally between 0.8–1.3 mg/l; it is now planned to reduce this level to 0.1 mg/l. For a plant with an annual capacity of 250,000 tons, the total air volume required for the dry ammonia fluidized bed is around 40,000 cubic meters per hour. A large amount of water is needed for absorption, and since the ammonia content in the gas is too low, it becomes difficult to recover it I’d like to know how other professionals handle this situation
The company hires experts at high salaries to address environmental protection issues
A solution has been found, and the performance is good. Cyclo-sulfurization technology is employed, with the gas going through processes of dust removal, cooling, separation, and recirculation; 98% carbon dioxide is used as the medium. The condensate water is sent to the system for ammonia concentration or ammonia distillation.
Will the ammonia smell be strong after it dries? You are referring to the drying process of wet ammonium, right? As for fluidized beds, it’s advisable to choose a higher air supply volume; for the belts used to transport wet ammonium, belt air shields should be installed. That’s about it, based on my humble opinion
Gas is recycled; there is no gas discharge, and thus no ammonia smell either
Internal circulation is merely a concept; its actual implementation does not yield satisfactory results