Recycling of desulfurization wastewater
Thread Content
In the FRC method, desulfurization waste liquid is sent to the incinerator together with low-quality sulfur paste; the SO2 generated thereafter is then catalytically oxidized to form SO3, which is absorbed by dilute sulfuric acid to produce H2SO4. Is this process feasible? What are the defects? I would appreciate the advice from all the teachers~
"What is \"desulfurization waste liquid\"? Burn it directly in the incinerator? How should I put it?
The desulfurization waste liquid resulting from HPF wet desulfurization (mainly (NH4)2S2O3 and NH4CNS), after concentration, is burned in an incinerator together with the low-quality S paste produced by the regeneration tower to generate SO2.
If you don’t understand the FRC method, what are the main components of desulfurization wastewater? Is it sulfurous acid? Sulfuric acid again? It is not possible to use dilute sulfuric acid to absorb SO3 in order to produce H2SO4; firstly, the materials used for corrosion protection cannot handle this process. Concentrated sulfuric acid is easier to work with from a corrosion protection perspective, while dilute sulfuric acid with a concentration of no more than 40% can still be handled, but what about solutions with a concentration of 60-80%? Personally, I think it’s better to directly produce sodium sulfite (the product) from sulfur dioxide; we have just finished the testing!
It’s not the FRC method for desulfurization; it’s the HPF method. The main components of the waste liquid are (NH4)2S2O3 and NH4CNS. Anyway, thank you for your further guidance
Dilute sulfuric acid has a strong corrosive effect; factories generally use 93% sulfuric acid to absorb sulfur trioxide. After obtaining sulfuric acid with a concentration of over 98%, water is added to dilute it, resulting in acid with a concentration of 93% or 98%. Additionally, the combustion of (NH4)2S2O3 and NH4CNS may produce ammonia, and ammonia reacting with sulfur dioxide or sulfur trioxide will crystallize, blocking pipes or affecting the quality of the acid.
Concentrated sulfuric acid is generally used to absorb sulfur trioxide. Moreover, as you mentioned, thiosulfate in the wastewater gradually decomposes into sulfur and sulfates in aqueous solutions above 50°. Sulfuric acid AN can only decompose at 280 degrees. I’ve never heard of this process; could you provide a detailed explanation?
For a coking plant with a capacity of 1.2 million tons, how much does it cost to build one set of equipment?
I would like to ask, where does all the waste liquid come from? Does Klaus Recycling have no waste liquid? What about the liquid sulfur degassing process?