Calculation of falling film evaporation of 75% sulfuric acid to 85–86% heat exchange area
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75% sulfuric acid is evaporated by falling film evaporation to 85–86%. The heat exchange section consists of two stages: the upper stage is heated with steam (steam pressure of 10 Kg, temperature of 200°C), while the lower stage is cooled with water. The inlet temperature is at room temperature, and the outlet temperature is 60°C. The flow rates are: 2 tons/hour, 4 tons/hour, 6 tons/hour
The energy consumption is too high – it’s not cost-effective; it’s better to use concentrated sulfuric acid or fuming sulfuric acid for adjustment