Problems with dry pre-treatment acid production dryers
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Our factory plans to install a 30,000-ton capacity plant for converting desulfurization waste liquid into acid, and we are considering the dry-pretreatment process. I’ve heard that the choice of dryer has a significant impact on the environment; do any of you have any recommendations for good dryers that could be shared?
The process for producing acid from desulfurization waste liquid (dry-process) used in Pingxiang Xinan – the XA dryer they chose works well; it is fully sealed and operates under slight negative pressure, though its volume is a bit large. I wonder what kind of dryer the original poster wants to choose?
The wet process for acid production is still better; the dry process generates too much wastewater
The dry-process acid production method generates less wastewater, and the desulfurization liquid obtained after drying can be used for salt extraction through multi-effect evaporation; the liquid is recycled back to the desulfurization system while the salt proceeds to the drying stage. On the contrary, the acid produced by the wet method is entirely dilute acid, and dilute acid is difficult to handle and utilize, has limited applications, and is costly. Therefore, the acid production process should be selected by comparing it with the conditions of one’s own enterprise.
Sichuan University employs a low-temperature process at 60°C, a dry method, and activated carbon-based catalytic oxidation to treat tail gases from acid production. If needed, I can make a recommendation for you
Sulfuric acid produced by the dry process contains a high amount of oil, and sulfur ammonia cannot be used – what is the reason for this?
The temperature is low, and there is too much tar from coking. We usually raise the temperature to 180°C to prevent the tar from condensing and sticking.
Do you have any projects that require flue gas desulfurization treatment?
No, I work for a wastewater treatment company; we deal mainly with water-related tasks.