Reasons why ammonium sulfate crystals cannot be formed in ammonia-based desulfurization
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Dear colleagues, our facility uses the ammonia-based desulfurization method for treating thermal power plant exhaust gases, but it is not currently possible to produce ammonium sulfate crystals. I would appreciate it if you could help analyze the reasons for this.
Is it that crystalization process? Saturation inside the tower or evaporation outside? What are the process parameters?
Without specifying the exact process parameters, it’s not possible to provide guidance---
The inability to form crystals can be attributed to the following reasons, for reference only: 1. Low oxidation efficiency, possibly due to low temperature of the oxidizing air； .The pH value is too low ； 1. The slurry concentration is too high. 2. It is optimal to maintain the temperature of the second-effect evaporator at 60–70 degrees Celsius, with the concentration of sulfuric acid AN kept between 46–48%. 3. The COD level of the slurry should be kept below 5 g/L
It’s likely not that ammonium sulfide crystals cannot form, but rather that the crystals are too small to be separated!
High dust levels and high ferrous ion concentrations can have an impact; there are many reasons for this, with the oxidation rate being the most important one
Which company’s desulfurization technology is this?