Calculations for cooling exhaust gases containing large amounts of water vapor by spraying
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I’m seeking help from all the experienced experts out there. The calcination exhaust gas from our plant contains a large amount of water vapor; its temperature is around 380–400°C. After passing through the dust removal equipment, it enters the waste acid spray tower (where the temperature of the waste acid is around 50–60°C and its concentration is 20%), where it is cooled to 80°C through spraying. It is now necessary to calculate the concentration of the pre-concentrated acid after spraying. The exhaust air volume is 50,000 m3/h, with a water vapor content of 35%, nitrogen at 54%, oxygen at 7%, and carbon dioxide at 4%. I simply calculated the amount of waste acid water involved in cooling, heat exchange, and evaporation using heat values, and determined the resulting concentration. I would like to ask how to calculate the amount of water vapor that condenses as a result of the decrease in exhaust gas temperature
This post was last edited by renyi7552 on 2021-5-24 at 11:54. The concentration of waste acid is approximately 28%~30%; this calculation requires trial and error, taking into account both thermal balance and mass balance
Since there is no flow meter for the acid entering the spray tower, I just want to simply calculate the amount of water vapor that condenses after the exhaust gas is cooled. The concentration obtained solely through heat balance is roughly the same as the actual concentration, around 27–28%. Now, water vapor also needs to be taken into account for further calculation. . . .