Design calculation of hydrofluoric acid scrubber tower
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Dear seniors, I would like to seek your advice regarding the design of a washing tower. The operating conditions are as follows: medium flow rate of 1200 kg/h, which is equivalent to a flow rate of 650 Nm3/h; inlet gas temperature of 50°C; inlet gas pressure of 3–5 kPa; and HF content of 700 ppm. It is required to use a scrubber tower to wash hydrogen fluoride, with tap water at room temperature being used. The water washing tower is made of PP material, and the packing can be regular plastic corrugated plates or bulk packings such as Pall rings. The hydrogen fluoride content in the raw gas after washing is no more than 1 ppm. Since hydrogen fluoride reacts with water to form hydrofluoric acid and aqua regia, which are deadly to subsequent equipment, the lower this concentration, the better; ideally, it should be at the PPB level. I would like to ask what the appropriate diameter and height for this tower are, and how to calculate them
I also struggle with the calculations related to absorption towers. The calculations in textbooks are somewhat simplistic, and the reliability of Aspen simulations is questionable. It seems that using conventional theoretical methods, combined with industry experience to determine appropriate liquid-gas ratios and spray densities, would yield more reliable results.