: Use Data Validation to create a dropdown list for packing styles (e.g., 1-inch Ceramic Pall Rings, 2-inch Metal Raschig Rings). Pair this with a VLOOKUP or XLOOKUP table to automatically source the corresponding packing factors ( Fpcap F sub p ) into your formulas.
Ensure the enthalpy of the exiting wet gas matches the total enthalpy of the entering hot dry gas minus losses.
Qsat=Qin⋅TsatTin⋅PinPsat+Volume of Added Water Vaporcap Q sub s a t end-sub equals cap Q sub i n end-sub center dot the fraction with numerator cap T sub s a t end-sub and denominator cap T sub i n end-sub end-fraction center dot the fraction with numerator cap P sub i n end-sub and denominator cap P sub s a t end-sub end-fraction plus Volume of Added Water Vapor
Height depends on the required efficiency for gas absorption (mass transfer) or particulate removal.
Output the saturated gas density, actual volumetric flow rate ( ACFMcap A cap C cap F cap M ), and total moisture content. Tab 3: Core Sizing & Packed Bed Design Calculates Tower Diameter.
When treating gases above 150°C (300°F), standard scrubbing mechanics change drastically due to immediate heat and mass transfer. Two primary phenomena dominate the inlet zone of a hot gas scrubber:
When process engineers talk about "hot" in the context of scrubber design, they are not just referring to a minor temperature increase. High-temperature gases, typically exceeding 150°C (300°F) and often reaching 1,000°C or more, fundamentally change the design approach in several critical ways:
The tower diameter is typically calculated to avoid "flooding," where upward gas velocity prevents downward liquid flow.
To calculate the molar flow rate of SO2, we need to convert the volumetric flow rate from Nm³/h to mol/h.
The required height depends on the mass transfer efficiency needed to meet outlet concentration targets.
: The U.S. EPA provides comprehensive workbooks like the Wet & Dry FGD Data Inputs
A=Qactual,outVdesigncap A equals the fraction with numerator cap Q sub a c t u a l comma o u t end-sub and denominator cap V sub d e s i g n end-sub end-fraction
Based on the molar flow rate of SO2, we can select a suitable scrubber type and size. For this example, let's assume a packed tower scrubber with a packed height of 5 meters.
Before chemical scrubbing happens, hot gas must be "quenched" to its adiabatic saturation temperature.
Complete Guide to Wet Scrubber Design Calculations with Excel
where R is the gas constant (8.314 J/mol·K).
$$Q_actual = Q_std \times \fracT_op + 273273 \times \frac1.013P_op$$
| Parameter | Input | Formula | Result | | --- | --- | --- | --- | | Gas Flow Rate (Q) | | | | | Velocity | | | | | Scrubber Diameter (D) | | =SQRT(4 Q/(PI() velocity)) | | | Scrubbing Liquid Flow Rate | | | | | L/G Ratio | | | | | Scrubber Height (H) | | =( scrubber volume /(PI() (D/2)^2)) | | | Pressure Drop (ΔP) | | =(f L* ρ)/(2*g) | |