This is where most "scrubber design excel" downloads fail. They treat volume as constant.
The efficiency is governed by the inertial impaction parameter ($\Psi$). Larger particles and higher relative velocities result in higher efficiency.
For a typical hot application (Inlet: 600°F, Outlet: 160°F): Factor = (620) / (1060) =
), temperature, pressure, molecular weight, and pollutant concentration ( Yincap Y sub i n end-sub Density ( ρlrho sub l ), viscosity ( μlmu sub l ), and required removal efficiency ( Packing Characteristics: Specific surface area ( ), packing factor ( Fpcap F sub p ), and critical surface tension. Step 2: Determine Column Diameter and Cross-Sectional Area
[Step 1: Input Gas/Liquid Parameters] │ ▼ [Step 2: Calculate Adiabatic Saturation (For Hot Gas)] │ ▼ [Step 3: Determine Column Diameter via Flooding Limits] │ ▼ [Step 4: Calculate NTU & HTU for Bed Height] │ ▼ [Step 5: Output Design Specifications & Pressure Drop] scrubber design calculation excel hot
The first step in packed bed tower design is establishing the tower diameter (
For high-temperature applications, the "hot" gas must be cooled to its before or during the scrubbing process. Gas Inlet Properties : Define your inlet gas temperature ( Tincap T sub i n end-sub
For gas absorption (Packed towers): L/G is calculated based on the flooding velocity and equilibrium curves, typically ranging from 2.0 to 10.0 Calculated as Module 4: Tower Sizing & Packing Hydraulics
The spreadsheet’s hidden VLOOKUPs pulled the physical properties of the gas. The NTU (Number of Transfer Units) cells turned a cautionary orange. The Solve: This is where most "scrubber design excel" downloads fail
The scrubber's cross-sectional area (and thus its diameter) must be sufficient to prevent , where liquid is carried upward by the gas instead of flowing down. The standard approach in Excel is an iterative one:
Ensure your Excel sheet flags warnings if the gas flow falls below 30–40% of design capacity. Low gas velocity can cause poor gas-liquid distribution, severely dropping emission removal efficiencies.
Industrial processes like incineration, metal smelting, and glass manufacturing generate hot, contaminated exhaust gases. Managing these streams requires robust air pollution control systems. Wet scrubbers are highly effective for removing particulate matter and acid gases ( SO2SO sub 2 ) from these high-temperature streams.
Determines the gas velocity using the Generalized Pressure Drop Correlation (GPDC) . It typically targets of the flooding velocity. Tower Diameter ( ): Larger particles and higher relative velocities result in
This is the critical design constraint.
You can download generic calculators, but here is how to build the version that stands out.
When searching for , do not settle for a static PDF or a generic absorber sheet. You require a dynamic workbook that solves the adiabatic cooling curve, corrects gas density, and checks thermal survival of droplets.
The following section details the specific formulas and logic flows to be implemented in the Excel spreadsheet.