Scrubber Design Calculation Excel Hot -
To ensure adequate surface wetting and cooling. 1. Input Data & Gas Properties
Hot gases will evaporate the scrubbing liquid until they reach the adiabatic saturation temperature ( Tsatcap T sub s a t end-sub
), which must be safely below the column flooding limit (typically designed at of flooding velocity):
Calculated to size the system fan or blower accurately. 2. Step-by-Step Scrubber Design Calculations scrubber design calculation excel hot
High evaporation rates mean substantial make-up water is required. 2. Key Design Parameters for the Excel Calculator
Calculate the "Saturated Gas Flow Rate." Hot gases shrink significantly when cooled by the scrubbing liquid. Use the ideal gas law and psychrometric data to find the adiabatic saturation temperature.
For hot gases, packing material must be high-temperature resistant (e.g., metal, ceramic, or specialized plastics). Input the provided by manufacturers in your Excel sheet. Calculate pressure drop ( ) using the Ergun equation or manufacturer correlations. Step 4: Mass Transfer (Height of Packing) The removal efficiency ( ) is determined by the number of transfer units ( NTUcap N cap T cap U ) and the height of a transfer unit ( HTUcap H cap T cap U (Assuming linear equilibrium) For hot scrubbing, NTUcap N cap T cap U To ensure adequate surface wetting and cooling
Gas expands as temperature rises. To find the actual gas density at hot operating conditions, use the ideal gas law:
Before sizing the tower, you must calculate the saturated gas flow rate. Hot inlet gas will evaporate scrubbing liquid, increasing the gas volume and cooling it to its adiabatic saturation temperature.
The scrubber liquid will evaporate rapidly, necessitating high liquid-to-gas ( Key Design Parameters for the Excel Calculator Calculate
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Hot gas contracts as it cools, but the addition of evaporated water vapor expands the total volume. For most hot gas streams, the net effect is a significant reduction in total volumetric flow rate, reducing downstream equipment sizing requirements. Step 3: Size the Vessel Geometry (Packed Bed Example)
Include columns for Material, Size (inches), Packing Factor ( Fpcap F sub p ), and Surface Area (
Avoid assuming a static pressure drop. Use the generalized Leva correlation formulas in Excel to verify that the pressure drop remains within the optimal operational window of per meter of packing.
