If you don't want to rebuild the wheel from scratch, here are your options:
While heavy simulation software (Aspen, HYSYS) is powerful, nothing beats an Excel sheet for rapid iteration, especially for hot gas scrubbing (e.g., exhaust from 150°C to 300°C). Temperature changes density, viscosity, and vapor pressure—if your sheet ignores these, your scrubber will flood or dry out.
This post walks you through building a packed bed wet scrubber calculator for hot gas streams (SO₂, HCl, or particulate removal with cooling).
Don't assume constant density. Use the ideal gas law in Excel: $$ρ_g (kg/m³) = \fracP_op \times MW8.314 \times (T_op + 273)$$
For hot gases, viscosity (μ) increases, which changes collection efficiency.
η = 1 – exp[- (ψ * Q_l) / (Q_g * μ)]
Where ψ is the inertial impaction parameter.
The search for "scrubber design calculation excel hot" is not about finding any spreadsheet—it is about finding the right thermodynamic engine. A standard isothermal calculator will overestimate efficiency and underestimate vessel size by a factor of 2 or more.
By building or purchasing an Excel tool that solves the adiabatic energy balance, corrects gas viscosity for temperature, and uses saturated gas volume for velocity calculations, you move from guessing to engineering.
Next Step: [Download the Pro-Tier "Hot Gas Venturi Scrubber Calculator" Excel Template (VBA Enabled)] – Includes psychrometric loop, material selector, and 3D output chart.
Author Bio: The author is a process engineer with 15 years of experience in cement kiln and incinerator scrubber retrofits.
Keywords: scrubber design calculation excel hot, venturi scrubber sizing spreadsheet, high temperature gas cleaning, adiabatic saturation Excel tool, packed bed scrubber thermal design.
The hum of the plant was usually a comfort to Elias, but today, the caustic scrubber scrubber design calculation excel hot
was screaming. Not literally, of course—though the high-pressure alarm on the control panel was doing a fine job of that.
The inlet gas temperature from the kiln had spiked, and the old design parameters were failing. If the liquid-to-gas ratio stayed this off-balance, the stack would start "yellow-smoking," and the EPA would be at the gates by noon.
Elias ducked into the site office, his boots clacking on the linoleum. He pulled up his master file: Scrubber_Design_Final_v4_HOT.xlsx
"Talk to me," he muttered, fingers flying across the mechanical keyboard. He didn't just need a fix; he needed a recalculation for adiabatic saturation
. As the hot gas hit the recirculating liquor, it would evaporate water instantly, cooling the gas but shrinking its volume and changing the density. The Inputs:
He punched in the new 450°F inlet temp and the soaring flow rate. The Magic:
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:
He adjusted the packing depth from 10 feet to 14. The pressure drop calculation—the heart of the sheet—recalculated.
With a final tweak to the pump frequency on the screen, he watched the "Flood Point %" drop from a dangerous 92% to a stable 70%. He hit 'Save,' exported the setpoints, and ran back to the floor.
Ten minutes later, the alarm fell silent. The plume at the top of the stack turned from a ghost of a haze to invisible, clean air. Elias leaned against the steel railing, the heat of the tower radiating against his back, and smiled. If you don't want to rebuild the wheel
The math held. The Excel sheet, messy as it was, had saved the day. pressure drop across the packing for your own design?
The design of a wet scrubber—whether for particulate removal or gas absorption—requires a systematic calculation process to determine critical dimensions and operational parameters. Utilizing a structured Excel spreadsheet
allows engineers to quickly iterate through design variables like gas flow rates, temperature, and pressure drops to find an optimal configuration. 1. Define Design Inputs and Gas Conditions
The first step is establishing the "source" data. In an Excel sheet, these are typically grouped in a dedicated "Inputs" tab. Gas Stream Properties : Include the inlet volumetric flow rate (e.g., in ), inlet temperature, and pressure. Saturation Calculations
: For hot gases, the scrubber will saturate the stream. You must calculate the saturated gas flow rate cap Q sub s a t end-sub ) and temperature ( cap T sub s a t end-sub
) using a psychrometric chart or humidity ratios. The scrubber is sized based on this saturated outlet volume, not the hot inlet volume. Target Efficiency : Define the required collection efficiency (e.g., for particulates) based on regulatory standards. 2. Determine Column Diameter The column diameter ( ) is primarily a function of the gas velocity required to avoid flooding while maintaining contact time. Calculation
: Divide the saturated volumetric flow rate by the allowable shell velocity (typically around for spray towers). Cross-Sectional Area ( cap A sub s
cap A sub s equals the fraction with numerator cap Q sub s a t end-sub and denominator v end-fraction Diameter (
cap D equals the square root of the fraction with numerator 4 cross cap A sub s and denominator pi end-fraction end-root Hydraulic Check : For packed towers, the Excel sheet should check the % Flooding (typically designed for
) using correlations like Norton’s to ensure the gas can move through the packing without pushing the liquid back up. 3. Calculate Tower Height and Packing Don't assume constant density
The height ensures sufficient contact time between the gas and the scrubbing liquid. Wet scrubber design calculation xls
Designing a scrubber, specifically for "hot" or high-temperature gas streams, requires accounting for gas humidification and volume changes before sizing the vessel. You can find pre-built templates on platforms like Scribd or Cheresources that handle these calculations. Core Calculation Steps for Hot Gas Scrubbers
For high-temperature applications, the "hot" gas must be cooled to its adiabatic saturation temperature before or during the scrubbing process. Gas Inlet Properties: Define your inlet gas temperature ( Tincap T sub i n end-sub
), flow rate, and pressure. Hot gases have lower density, which significantly increases the required tower diameter.
Saturation & Humidity: Calculate the saturated gas flow rate. For example, a gas at 400°F may have a saturation temperature around 127°F, which changes the volumetric flow rate ( Qsatcap Q sub s a t end-sub ) used for sizing.
Liquid-to-Gas (L/G) Ratio: This is the most critical design parameter. For venturi scrubbers, typical ratios are 7–20 gallons per 1,000 cubic feet of gas.
Tower Diameter: Use the gas velocity and pressure drop to find the cross-sectional area. The diameter ( ) is typically calculated as Pressure Drop ( ΔPcap delta cap P
): For venturi types, use the Hesketh or Calvert equations to ensure the fan can handle the resistance. Recommended Excel Templates
Excel calculation sheet for rating of a spray tower scrubber
Title: Scrubber Design Calculation in Excel: The Hot, Handy Template You Need
Meta Description: Stop guessing the L/G ratio. Here is a step-by-step guide to building a hot (high-temperature) packed bed scrubber design sheet in Excel, including flooding velocity, pressure drop, and makeup water.