Don't assume constant density. Use the ideal gas law in Excel: $$ρ_g (kg/m³) = \fracP_op \times MW8.314 \times (T_op + 273)$$
– You need a lookup table for your packing. Create a small table in Excel: | Packing Type | Flooding K4 at ΔP=42 mmH₂O/m | | :--- | :--- | | 1" Metal Pall Ring | 1.8 | | 2" Plastic Pall Ring | 1.2 | | 3" Ceramic Intalox | 0.9 | scrubber design calculation excel hot
where v is the superficial gas velocity ( typically 1-3 m/s). Don't assume constant density