Reasons for white smoke emission from the exhaust gas of the spent acid regeneration unit
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White smoke was emitted from the exhaust gas of the spent acid regeneration unit; increasing the reflux temperature of the second suction significantly reduced the white smoke. What are the specific factors that cause white smoke? (The exhaust gas is released into the atmosphere after passing through the alkali scrubber tower)
It is mainly caused by the excessively high reflux temperature, which prevents the absorption of sulfur trioxide and leads to the formation of acid mist. There is also an alkaline washing process for the exhaust gases, so it’s necessary to check the concentration of the alkaline solution used!
During operation, if the reflux temperature of the second suction stage is below 65 degrees, white smoke may appear from the chimney; generally, the temperature is increased to around 67-70 degrees, and then no white smoke appears
Are there any specific figures? I’ll help you analyze the volume, temperature, and gas composition
Most likely, the absorption efficiency of the absorber is not optimal; some sulfur trioxide fails to be absorbed. Increasing the reflux rate when the acid concentration is within the acceptable range, or adjusting the temperature of the absorber, can help – a lower temperature improves the absorption efficiency.