Questions and Answers
What is used to raise the temperature of the mixture in the first dissolving reactor?
Fresh nitric acid plus wash acid
Where does the dissolved liquid flow over to after the completion of the reaction in the second stage dissolving reactor?
Buffer tank
What is added in the first dissolving reactor to control NOx in off-gases?
Urea solution
What is discharged with CO2 and H2O vapor to a scrubber during the dissolution process?
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What is sent to the first dissolving reactor to avoid foaming during the reactions?
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Study Notes
Dissolution Process
- Heat from high-pressure steam is used to raise the temperature of the mixture in the first dissolving reactor.
Flow of Dissolved Liquid
- The dissolved liquid flows over to the second stage dissolving reactor after the completion of the reaction.
Emission Control
- Ammonia is added in the first dissolving reactor to control NOx in off-gases.
Scrubbing Process
- The unreacted sulfur dioxide is discharged with CO2 and H2O vapor to a scrubber during the dissolution process.
Anti-Foaming Agent
- Silicone-based antifoam agents are sent to the first dissolving reactor to avoid foaming during the reactions.
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