On the selection of air velocity for empty tower coolers
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In a design manual, the gas velocity in an empty tower ranges from 0.6 to 1.0; in the book \"Sulfuric Acid\", it is 1 to 1.4 Nm/s. It is stated that a low gas velocity can actually affect the dust removal efficiency of the empty tower. The difference is quite large when calculated; please give some advice
The recommended empty tower gas velocity in the \"Sulfuric Acid Process Design Manual\" is 0.6–1.2 Nm/s, while abroad it is 1.6 m/s. The recommended empty tower gas velocity for sulfuric acid production is 1–1.4 Nm/s; too high a gas velocity leads to more foam formation. However, with advances in equipment technology, there is a tendency to use higher flow rates, so it is recommended to set the empty tower gas velocity at 1.2 Nm/s.
All of the above statements are correct; generally, the gas velocity ranges from 0.4 to 0.8 m/s, but it also depends on the amount of dust in the gas entering the tower – there is no fixed velocity value.