To design an effective Venturi scrubber calculation in Excel, you must structure your spreadsheet to handle input parameters, intermediate calculations for throat velocity, and final outputs for pressure drop and collection efficiency. 1. Input Parameters
Define these essential inputs in your spreadsheet's dedicated "Inputs" section: Gas Properties: Flow rate ( Qgcap Q sub g ), temperature ( Tgcap T sub g ), pressure ( ), moisture content, and molecular weight ( MWgascap M cap W sub g a s end-sub Liquid Properties: Flow rate ( Qlcap Q sub l ), temperature ( Tlcap T sub l ), density ( ρlrho sub l ), viscosity ( μlmu sub l ), and surface tension ( Particle Properties: Mean particle size ( ), particle density ( ρprho sub p ), and required removal efficiency ( 2. Calculating Throat Velocity ( )
Throat velocity is the most critical sizing parameter, typically ranging between
. Use the following steps to calculate it based on a required collection efficiency: Cunningham Slip Correction Factor ( ):
C=1+(0.000621⋅Tgdp⋅106)cap C equals 1 plus open paren the fraction with numerator 0.000621 center dot cap T sub g and denominator d sub p center dot 10 to the sixth power end-fraction close paren Tgcap T sub g is in Kelvin ( is in meters ( Inertial Impaction Parameter ( ):
ψ=(ln(1−η)k⋅R)2psi equals open paren the fraction with numerator l n open paren 1 minus eta close paren and denominator k center dot cap R end-fraction close paren squared is a correlation coefficient (typically is the liquid-to-gas ratio in Final Throat Velocity ( ):
vt=ψ⋅9⋅μg⋅dlC⋅dp2⋅ρpv sub t equals the fraction with numerator psi center dot 9 center dot mu sub g center dot d sub l and denominator cap C center dot d sub p squared center dot rho sub p end-fraction
is the mean droplet diameter, often calculated using the Nukiyama & Tanasawa correlation. 3. Pressure Drop Calculation ( ΔPcap delta cap P )
The pressure drop determines the energy cost of the system. A common formula is the Hesketh Equation:
ΔP=0.532⋅vt2⋅ρg⋅At0.133⋅(0.56+16.6⋅(Ql/Qg)+40.7⋅(Ql/Qg)2)cap delta cap P equals 0.532 center dot v sub t squared center dot rho sub g center dot cap A sub t to the 0.133 power center dot open paren 0.56 plus 16.6 center dot open paren cap Q sub l / cap Q sub g close paren plus 40.7 center dot open paren cap Q sub l / cap Q sub g close paren squared close paren : Throat velocity ( ρgrho sub g : Gas density ( kg/m3kg/m cubed Atcap A sub t : Throat area ( m2m squared : Volumetric liquid-to-gas ratio. 4. Equipment Sizing (Output Section)
Once the throat velocity is established, calculate the physical dimensions: Throat Area ( Atcap A sub t ): Throat Diameter ( Dtcap D sub t ):
(4⋅At)/πthe square root of open paren 4 center dot cap A sub t close paren / pi end-root Throat Length ( Ltcap L sub t ): Often sized as Diverging Section Length ( Ldcap L sub d ): Often sized as
For pre-built templates and detailed examples, you can refer to existing Venturi Scrubber Design Calculations on Scribd or technical resources from Cheresources. Design Equations For Venturi Scrubbers
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
Venturi Scrubber Design Calculation XLS: A Comprehensive Guide to Updated Methods
Venturi scrubbers are a type of air pollution control device used to remove particulate matter and gases from industrial exhaust streams. The design of a venturi scrubber requires careful calculation to ensure efficient operation and optimal performance. In this article, we will provide an overview of the venturi scrubber design calculation process, including a discussion of the updated methods and a guide to using XLS (Excel) for calculations.
What is a Venturi Scrubber?
A venturi scrubber is a type of wet scrubber that uses a converging-diverging nozzle, known as a venturi, to accelerate the gas stream and create a region of high turbulence. This turbulence enhances the contact between the gas and liquid phases, allowing for efficient removal of particulate matter and gases. Venturi scrubbers are commonly used in industrial applications, such as in the control of particulate matter and acid gases from power plants, steel mills, and chemical plants.
Design Considerations for Venturi Scrubbers
The design of a venturi scrubber involves several key considerations, including:
Venturi Scrubber Design Calculation XLS
To facilitate the design calculation process, XLS (Excel) can be used to create a spreadsheet that automates the calculations. The following steps outline the general procedure for performing venturi scrubber design calculations using XLS:
Updated Methods for Venturi Scrubber Design Calculation
In recent years, updated methods have been developed for venturi scrubber design calculation. These methods include:
XLS Template for Venturi Scrubber Design Calculation
To facilitate the design calculation process, a sample XLS template is provided below:
| Parameter | Value | | --- | --- | | Gas flow rate (m³/s) | 10 | | Gas composition (%) | 100 | | Particulate matter concentration (mg/m³) | 1000 | | Gas concentration (ppm) | 100 | | Liquid flow rate (m³/s) | 2 | | Liquid type | Water | | Duct diameter (m) | 1 | | Throat diameter (m) | 0.5 | | Pressure drop (Pa) | 1000 | | Collection efficiency (%) | 90 |
Using this template, designers can quickly and easily perform venturi scrubber design calculations and evaluate the impact of different design parameters on performance.
Conclusion
In conclusion, the design of a venturi scrubber requires careful calculation to ensure efficient operation and optimal performance. By using XLS (Excel) and updated methods, designers can quickly and easily perform venturi scrubber design calculations and evaluate the impact of different design parameters on performance. This article has provided a comprehensive guide to venturi scrubber design calculation XLS, including a discussion of updated methods and a sample XLS template.
References
Update Log
By following the guidance provided in this article, designers can create effective venturi scrubber designs that meet regulatory requirements and minimize environmental impact.
For Venturi scrubber design calculations, high-quality Excel templates typically follow standard engineering correlations like the Hesketh equation for pressure drop and the Calvert model for collection efficiency. You can find several specialized calculation tools and documented spreadsheets on Scribd, which hosts the Venturi Scrubber Design Calculation Xls. Key Design Parameters and Equations
A robust spreadsheet should automate the following core calculations: Pressure Drop ( ΔPcap delta cap P
): Often calculated using the Hesketh Equation, which factors in throat velocity, gas density, and liquid-to-gas (
Collection Efficiency: Determined by the Calvert Equation, relating particle diameter and gas-liquid interaction to the "cut diameter". Sizing Dimensions: Calculation of throat area ( Atcap A sub t ), diameter ( Dthroatcap D sub t h r o a t end-sub
), and the lengths of the converging and diverging sections (typically 3:1 and 4:1 ratios).
Saturation Calculations: Determining the saturated gas flow rate based on inlet temperature and moisture content. Available Spreadsheet Resources
The following professional resources provide the mathematical framework and downloadable examples: Wet Scrubber Application Guide - Sly Inc.
To design a Venturi scrubber and build an automated calculation spreadsheet, you must focus on three core areas: gas humidification throat sizing (based on required efficiency), and pressure drop estimation 1. Identify Target Efficiency and Throat Velocity
The efficiency of a Venturi scrubber is a function of the inertial impaction of particles on liquid droplets. Fractional Efficiency ( Typically 99% or higher. Inertial Impaction Parameter ( Calculate the required value for a target efficiency:
psi equals open paren the fraction with numerator l n open paren 1 minus eta close paren and denominator k center dot cap R end-fraction close paren squared : Correlation coefficient (typically 0.1 to 0.2). : Liquid-to-gas ratio ( Calculate Throat Velocity (
v sub t equals the fraction with numerator psi center dot 9 center dot mu sub g center dot d sub l and denominator cap C center dot d sub p squared center dot rho sub p end-fraction
: Mean droplet diameter (calculated via Nukiyama & Tanasawa correlation). : Cunningham Slip correction factor. : Gas viscosity. 2. Determine Physical Dimensions
Once you have the required velocity, size the mechanical components. Throat Area ( cap A sub t cap Q sub g s a t end-sub is the saturated gas flow rate. Throat Diameter ( cap D sub t Standard Geometry Ratios: Throat Length: Diverging Section Length: 3. Estimate Pressure Drop ( cap delta cap P
The pressure drop determines the fan power required. Use the Hesketh Equation for high accuracy:
cap delta cap P equals 0.532 center dot v sub t squared center dot rho sub g center dot cap A sub t to the 0.133 power center dot open paren 0.56 plus 16.6 center dot the fraction with numerator cap Q sub l and denominator cap Q sub g end-fraction plus 40.7 center dot open paren the fraction with numerator cap Q sub l and denominator cap Q sub g end-fraction close paren squared close paren Typical Ranges:
Pressure drops often range from 10 to 100 inches of water column (in. W.C.) depending on particle size and efficiency needs. 4. Excel/XLS Spreadsheet Structure
Organize your "upd" (updated) spreadsheet with these specific input/output blocks: Parameters to Include Gas flow rate (ACFM), Inlet Temp ( ), Moisture content (%), Particle size ( ), Target Efficiency ( Fluid Properties Gas density ( ), Gas viscosity ( ), Liquid-to-Gas ratio (L/G: typically 4–20 gal/1000 Intermediate
Saturated gas flow rate, Cunningham Slip factor, Mean droplet diameter ( Throat Diameter Pressure Drop cap delta cap P Fan Power requirement Actionable Next Step: ready-to-use template
Venturi scrubbers are highly effective wet scrubbing systems used primarily to remove fine particulate matter (PM) from industrial gas streams
. By forcing gas through a narrow "throat" at high velocities (30 to 120 m/s), they create intense turbulence that atomizes scrubbing liquid into fine droplets, which then capture dust and fumes through inertial impaction. Key Design Parameters
Designers must balance high collection efficiency against the energy costs associated with pressure drop. Throat Velocity (
The critical driver for efficiency. Higher velocities increase turbulence and droplet-particle collisions, but also sharply increase energy consumption. Pressure Drop ( cap delta cap P
Usually ranges from 50 to 150 cm of water (20 to 60 inches) for typical industrial applications. It is a primary indicator of performance and operating cost. Liquid-to-Gas Ratio ( venturi scrubber design calculation xls upd
Most systems operate between 0.4 and 1.3 L/m³ (3 to 10 gal/1000 ft³). Insufficient liquid fails to cover the throat, while excessive liquid provides diminishing returns. Review of Calculation Models
Several established models are used in Excel-based design tools to predict performance: What Is A Venturi Scrubber?
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.
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.
A venturi scrubber is a high-energy gas cleaning device that uses a liquid spray to remove fine particulate matter (PM) and some gaseous pollutants from industrial exhaust streams. The design process focuses on balancing particle removal efficiency against the energy consumption required to overcome gas pressure drop. Core Design Parameters
The following parameters are essential for a complete venturi scrubber design: Gas Properties: Flow rate (ACFM), temperature ( ∘Fraised to the composed with power F ∘Craised to the composed with power C ), and moisture content (% v/v).
Contaminant Data: Particle size distribution (often characterized by mean particle size) and required removal efficiency.
Liquid/Gas (L/G) Ratio: The volume of scrubbing liquid per volume of gas, typically ranging from 3 to 20 gallons per 1,000 ACF. Key Calculation Steps
These steps form the basis of most standard Venturi Scrubber Design XLS templates. 1. Humidification and Saturation Inlet gas is often hot (e.g., 400∘F400 raised to the composed with power F
) and must be cooled to saturation before effective scrubbing can occur. Psychrometric Data: Use inlet temperature ( Tincap T sub i n end-sub ) and humidity ( Hincap H sub i n end-sub ) to find the saturation temperature ( Tsatcap T sub s a t end-sub ) and saturated humidity ( Hsatcap H sub s a t end-sub ) from a psychrometric chart. Saturated Gas Flow ( Qsatcap Q sub s a t end-sub
): Calculate the volume of the gas once it has cooled and absorbed water vapor. This volume determines the physical size of the throat. 2. Throat Sizing
The throat is the narrowest part of the scrubber where gas velocity is highest (typically 60–150 m/s). Throat Velocity ( vthroatv sub t h r o a t end-sub
): Determined based on required collection efficiency—higher velocities increase efficiency but also increase pressure drop. Throat Diameter ( Dthroatcap D sub t h r o a t end-sub ): Calculated using the saturated gas flow rate ( Qsatcap Q sub s a t end-sub ) and the chosen throat velocity: To design an effective Venturi scrubber calculation in
Athroat=Qsatvthroatcap A sub t h r o a t end-sub equals the fraction with numerator cap Q sub s a t end-sub and denominator v sub t h r o a t end-sub end-fraction Throat Length ( Lthroatcap L sub t h r o a t end-sub ): Usually 2.5 to 3 times the throat diameter. 3. Pressure Drop ( ΔPcap delta cap P ) Calculation Venturi Scrubber Design Calculations | PDF | Gases - Scribd
I understand you're looking for an update on Excel-based (XLS) design calculations for Venturi scrubbers. While I cannot directly provide or host spreadsheet files, I can give you a structured summary report of the key design parameters, typical calculation steps, and where to find updated tools or templates.
You can create a robust design tool by setting up an Excel sheet with the following columns and formulas.
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The latest Venturi scrubber XLS tools now integrate real-time unit conversion, graphical output, and fan power costing. If you cannot locate an updated XLS, I recommend:
Would you like me to provide full step-by-step Excel formulas (without the file) so you can build or update your own Venturi scrubber calculator from scratch?
Let me know, and I’ll format them ready to copy-paste into Excel cells.
Introduction
A Venturi scrubber is a type of air pollution control device used to remove particulate matter and gases from industrial exhaust streams. The design of a Venturi scrubber requires careful calculation to ensure efficient operation and optimal performance. This write-up provides an overview of the design calculation for a Venturi scrubber using an XLS (Excel) spreadsheet.
Venturi Scrubber Design Calculation XLS
The Venturi scrubber design calculation XLS is a spreadsheet tool used to design and optimize Venturi scrubbers for various industrial applications. The calculation involves several key parameters, including:
Design Calculation Steps
The design calculation steps for a Venturi scrubber using an XLS spreadsheet are as follows:
XLS Spreadsheet Features
The Venturi scrubber design calculation XLS spreadsheet may include the following features:
Benefits and Applications
The Venturi scrubber design calculation XLS spreadsheet offers several benefits, including:
The Venturi scrubber design calculation XLS spreadsheet is applicable to various industrial processes, including:
Beware of outdated free downloads (pre-2015). Recommended sources:
If you build your own, ensure the VBA code includes:
[ d_50 = \sqrt\frac9 \mu_g \cdot D_d2 \rho_p \cdot v_t \cdot \psi ]
Where ψ is the inertial impaction parameter. Updated XLS templates embed droplet diameter (D_d) correlation from Nukiyama–Tanasawa:
[ D_d = \frac0.585v_rel \sqrt\frac\sigma\rho_l + 0.0017 \left(\frac\mu_l\sqrt\sigma \rho_l\right)^0.45 ]