Venturi Scrubber Design Calculation Xls Upd -
The updated correlation includes an entrainment check: Critical velocity for droplet carryover = 23 m/s, actual outlet velocity = 18 m/s → safe.
Before diving into the spreadsheet layout, revisit the three governing zones:
Older spreadsheets often rely on classical models from the 1970s—Johnstone, Calvert, or Yung models. While foundational, they lack:
An updated XLS incorporates recent empirical correlations from Aerosol Science and Technology (2020–2025) and allows for:
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Inputs (user enters):
Outputs (calculated):
The next generation of design spreadsheets will integrate:
However, for 95% of industrial applications today, a well-structured Venturi scrubber design calculation XLS UPD remains the gold standard – balancing speed, accuracy, and transparency.
An updated Venturi scrubber design calculation spreadsheet is not just a convenience; it is a necessity for compliance, energy cost control, and reliable operation. By incorporating modern droplet size correlations, iterative throat solvers, and particle re-entrainment checks, the latest XLS tools reduce engineering guesswork and field failures.
Whether you are retrofitting an existing unit or sizing a new system, download or develop an XLS that follows the structure outlined above. Always validate with pilot tests for critical applications. And remember: the best spreadsheet is one that clearly shows its assumptions, sources, and limitations.
Author’s Note: If you need a ready-to-use, updated XLS template described in this article, check the supplementary resources linked below (free basic version with unlocked VBA). Always perform a field validation before final fabrication.
Last updated: May 2026 – reflects the latest empirical models from the International Aerosol Conference 2025.
This paper outlines the technical framework for designing and calculating the performance of a Venturi scrubber
, focusing on pressure drop, collection efficiency, and geometric optimization. 1. Introduction to Venturi Scrubber Dynamics
Venturi scrubbers are high-energy contactors used primarily for removing submicron particulate matter from gas streams. The process relies on a high-velocity gas stream to atomize a scrubbing liquid into fine droplets. The differential velocity between these droplets and the dust particles facilitates , which is the primary mechanism of collection. 2. Core Design Parameters
To develop a robust calculation model (typically implemented in Excel/VBA), the following parameters must be defined: Gas Flow Rate ( cap Q sub g
The volumetric flow of the inlet gas, adjusted for temperature and pressure. Liquid-to-Gas Ratio ( Usually expressed as gallons per 1,000 cubic feet ( ) or liters per cubic meter ( ). Typical values range from 7 to 20 Throat Velocity ( cap V sub t
The gas velocity at the narrowest point, ranging from 150 to 450 feet per second (fps). 3. Pressure Drop Calculations ( cap delta cap P
The pressure drop is the most critical factor, as it directly correlates to both the energy consumption and the collection efficiency. The Calvert Equation is a standard for these calculations:
cap delta cap P equals 5.0 cross 10 to the negative 5 power center dot open paren cap V sub t close paren squared center dot open paren cap L / cap G close paren cap delta cap P is in inches of water ( cap V sub t is the throat velocity (fps). is the liquid-to-gas ratio ( Note: For more precise modeling, the Yong Equation
may be used to account for gas density and liquid surface tension variations. 4. Collection Efficiency and Particle Size The efficiency is determined by the Inertial Impaction Parameter ( . The relationship is defined as:
psi equals the fraction with numerator cap C prime center dot rho sub p center dot d sub p squared center dot cap V sub t and denominator 9 center dot mu sub g center dot cap D sub d end-fraction = Cunningham slip correction factor. = Particle density. = Particle diameter. = Gas viscosity. cap D sub d venturi scrubber design calculation xls upd
= Mean droplet diameter (calculated via the Nukiyama-Tanasawa equation). 5. Implementation in Excel (XLSX/XLSM)
An effective design tool should be structured with the following modules: Input Sheet:
Gas composition, temperature, dust loading, and desired removal efficiency. Calculation Engine: Utilizing the equations above to solve for throat area ( cap A sub t ) and required pressure drop. Geometry Output:
Calculations for the converging section angle (typically 15-25°) and diverging section angle (typically 6-7° to minimize pressure recovery loss). Sensitivity Analysis: Tables showing how changes in
ratio affect the operating costs (Fan HP) versus efficiency. 6. Maintenance and Scalability Calculations should include a Scrubbing Liquor Saturation
check to ensure the gas is properly cooled and saturated before entering the throat. High-solids content in the recirculating liquid must be factored into the viscosity variables to maintain accuracy over time. or a specific VBA macro snippet
to automate the pressure drop iterations in your spreadsheet?
The search for a "venturi scrubber design calculation xls upd" refers to a specific, widely-used Excel workbook designed for the technical sizing and performance evaluation of venturi scrubbers.
This tool is favored for industrial applications such as boiler waste gas treatment and metal processing because it automates complex fluid dynamic correlations. Core Capabilities & Features
The "upd" (updated) versions of these calculation sheets typically include:
Inlet Gas Humidification: Calculates the psychrometric changes as hot raw gas is saturated before entering the throat.
Dimensional Sizing: Determines the precise diameters and lengths for the converging, throat, and diverging sections based on target gas velocities.
Efficiency Modeling: Uses established models like the Calvert cut diameter method to predict collection efficiency for specific particle sizes.
Pressure Drop Estimation: Uses Hesketh or Young equations to calculate the energy requirement, which is critical since venturi scrubbers often operate at high pressure drops (10–25 inches of water). Critical Design Parameters Included
According to documentation from Cheresources and Scribd, the spreadsheet processes the following: Throat Velocity (
): Typically optimized between 70–90 m/s for maximum particulate capture. Liquid-to-Gas Ratio (
): A primary driver for collection efficiency, usually ranging from 7 to 20 gallons per 1000 cubic feet of gas. Mean Droplet Diameter (
): Calculated via the Nukiyama & Tanasawa correlation to determine how effectively the liquid will atomize. Typical Design Outputs Users can expect a full mechanical and process summary:
Saturated Gas Flow Rate: Essential for downstream equipment sizing. Physical Geometry: Specific ratios such as and are often standard defaults.
Make-up Liquid Requirements: Estimates the water or chemical solution needed to replace evaporative losses. Where to Find the Spreadsheet
The most comprehensive version is often hosted on Scribd as "143362690-Venturi-Scrubber-Design-xls".
Additional technical guides and PDFs explaining the underlying math are available via Cheresources and ResearchGate. Before diving into the spreadsheet layout, revisit the
To help you get the most out of these calculations, could you tell me if you're looking to design a new system or evaluate the performance of an existing one? Knowing your target particle size (in microns) would also help in selecting the right efficiency model. Venturi Scrubber Design Calculations | PDF | Gases - Scribd
Venturi scrubbers are highly efficient air pollution control devices used primarily for removing particulate matter and hazardous gases from industrial exhaust streams. Designing an effective system requires precise calculations to balance collection efficiency against energy costs.
This guide explores the fundamental design equations and provides a structured approach to building a calculation spreadsheet. Fundamental Principles of Venturi Scrubbers A Venturi scrubber consists of three main sections:
Converging Section: Accelerates the gas stream to high velocities.
Throat: The narrowest point where scrubbing liquid is injected and atomized.
Diverging Section: Decelerates the gas and recovers static pressure.
The primary mechanism for particle collection is inertial impaction. As high-velocity gas hits the relatively slow-moving liquid droplets, particles are captured within the liquid phase. Key Design Parameters
To build a reliable calculation tool, you must define the following input variables: Gas Flow Rate ( Qgcap Q sub g ): Usually measured in Actual Cubic Feet per Minute (ACFM). Gas Density ( ρgrho sub g ): Critical for pressure drop calculations.
Particle Size Distribution: Specifically the Mass Median Diameter (MMD).
Liquid-to-Gas Ratio (L/G): Typically ranges from 7 to 20 gallons per 1,000 ACF. Throat Velocity ( Vtcap V sub t ): Generally between 150 and 450 feet per second. Step-by-Step Calculation Methodology 1. Calculating Gas Velocity
The velocity at the throat determines the energy available for atomizing the liquid. Use the continuity equation: Atcap A sub t is the cross-sectional area of the throat. 2. Estimating Pressure Drop ( ΔPcap delta cap P
The pressure drop is the most significant operating cost. The most common formula used in design spreadsheets is the Johnstone equation or the Calvert modification: is an empirical constant specific to the scrubber geometry. 3. Droplet Size Prediction
The Nukiyama and Tanasawa equation is often used to predict the Sauter Mean Diameter ( ) of the droplets:
d0=585Vtσρl+597(μlσ⋅ρl)0.45(1000LG)1.5d sub 0 equals the fraction with numerator 585 and denominator cap V sub t end-fraction the square root of the fraction with numerator sigma and denominator rho sub l end-fraction end-root plus 597 open paren the fraction with numerator mu sub l and denominator the square root of sigma center dot rho sub l end-root end-fraction close paren to the 0.45 power open paren 1000 the fraction with numerator cap L and denominator cap G end-fraction close paren to the 1.5 power
Smaller droplets increase surface area but require more energy to produce. 4. Collection Efficiency
Efficiency is calculated using the Johnstone equation for specific particle diameters ( is the inertial impaction parameter. Building the XLS Calculation Tool
When setting up your updated Excel or Google Sheets tool, organize it into four distinct tabs:
Inputs: Gas properties, liquid properties, and target removal efficiency.
Calculations: Hidden formulas for velocity, pressure drop, and droplet size.
Results: Summary of throat dimensions, power requirements (BHP), and total L/G needed.
Sensitivity Analysis: Graphs showing how changes in gas flow affect pressure drop. Maintenance and Optimization
💡 Pro-Tip: Always include a "Safety Factor" of 15-20% in your pressure drop calculations to account for scaling or minor fluctuations in gas flow. focusing on pressure drop
Monitor Liquid Quality: Suspended solids in the scrubbing liquid can erode the throat.
Adjustable Throats: Consider a variable throat design if your process gas flow varies by more than 20%.
Material Selection: Use corrosion-resistant alloys or FRP for acidic gas streams. If you'd like to refine your design further, tell me: The type of dust or gas you are scrubbing. Your target emission limit. The available pressure head from your existing fan.
Design and Calculation of Venturi Scrubbers Venturi scrubbers are high-energy wet scrubbers used primarily for removing fine particulate matter (
) and highly soluble gases from industrial waste streams. The design process centers on finding the balance between high collection efficiency and the energy cost associated with gas pressure drop. 1. Core Design Parameters
A standard venturi scrubber consists of three main sections: a converging section, a throat, and a diffuser (diverging section). Gas Flow Rate ( Qgcap Q sub g ): The volume of gas to be treated, typically measured in ACFMcap A cap C cap F cap M Throat Velocity (
): Higher velocities increase efficiency but also increase pressure drop. Typical ranges are ( Liquid-to-Gas Ratio (
): The amount of scrubbing liquid injected per unit of gas. Typical values range from for optimum efficiency. 2. Step-by-Step Calculation Procedure
To build an Excel-based design tool, follow these sequential steps: Step 1: Determine Throat Area and Diameter
Based on the process gas flow rate and your target throat velocity, calculate the throat area ( Atcap A sub t
At=Qgvtcap A sub t equals the fraction with numerator cap Q sub g and denominator v sub t end-fraction Atcap A sub t , the diameter ( Dtcap D sub t
Dt=4Atπcap D sub t equals the square root of the fraction with numerator 4 cap A sub t and denominator pi end-fraction end-root Step 2: Calculate Mean Droplet Diameter ( )
Droplet size is critical for inertial impaction. Use the Nukiyama & Tanasawa Correlation:
dl=(0.000585vr)σρl+0.0597(μlσρl)0.45(QlQg)1.5d sub l equals open paren the fraction with numerator 0.000585 and denominator v sub r end-fraction close paren the square root of the fraction with numerator sigma and denominator rho sub l end-fraction end-root plus 0.0597 open paren the fraction with numerator mu sub l and denominator the square root of sigma rho sub l end-root end-fraction close paren to the 0.45 power open paren the fraction with numerator cap Q sub l and denominator cap Q sub g end-fraction close paren to the 1.5 power is relative velocity (often assumed ≈vtis approximately equal to v sub t is surface tension, and ρlrho sub l is liquid density. Step 3: Estimate Collection Efficiency ( ) Efficiency depends on the Inertial Impaction Parameter ( ):
ψ=Cdp2ρpvt9μgdlpsi equals the fraction with numerator cap C d sub p squared rho sub p v sub t and denominator 9 mu sub g d sub l end-fraction
η=1−e−kRψeta equals 1 minus e raised to the negative k cap R the square root of psi end-root power is the Cunningham Slip correction factor, is particle diameter, and is a correlation coefficient (typically Step 4: Calculate Pressure Drop ( ΔPcap delta cap P )
Pressure drop is the primary operational cost. Use the Hesketh Equation:
ΔP=0.532vt2ρgAt0.133(0.56+16.6QlQg+40.7(QlQg)2)cap delta cap P equals 0.532 v sub t squared rho sub g cap A sub t to the 0.133 power open paren 0.56 plus 16.6 the fraction with numerator cap Q sub l and denominator cap Q sub g end-fraction plus 40.7 open paren the fraction with numerator cap Q sub l and denominator cap Q sub g end-fraction close paren squared close paren 3. Recommended Excel Worksheet Structure
To create a "solid" calculation XLS, organize your sheets as follows: Venturi Scrubber Design Equations | PDF | Gases - Scribd
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If you are updating your own XLS: