For more complex calculations (like iterative solver for pressure drop), you can add this VBA code to your Excel file.
Function VenturiPressureDrop(V_Throat_FtSec As Double, LG_Ratio As Double) As Double
' Calculates Pressure Drop in inches of water column (in. w.c.)
' Based on simplified Calvert Equation
' V_Throat_FtSec: Gas velocity at throat (ft/sec)
' LG_Ratio: Liquid to Gas ratio (gal/1000 ft3)
VenturiPressureDrop = (V_Throat_FtSec ^ 2 * LG_Ratio) / 5050 * 0.001
End Function
Function VenturiEfficiency(Particle_Diameter_Micron As Double, LG_Ratio As Double, V_Throat_FtSec As Double, Gas_Density As Double, Liquid_Density As Double) As Double
' Simplified efficiency calculation based on Johnstone Equation
' Returns efficiency as a percentage (0-100)
Dim k As Double ' Empirical constant
k = 0.00015 ' Typical value depending on geometry
Dim Nt As Double ' Number of transfer units
Nt = k * (Particle_Diameter_Micron ^ 2) * V_Throat_FtSec * (Liquid_Density / Gas_Density) * (LG_Ratio / 1000)
Dim Eff As Double
Eff = 1 - Exp(-Nt)
VenturiEfficiency = Eff * 100
End Function
You can then use these functions directly in your spreadsheet:
=VenturiPressureDrop(300, 5) or =VenturiEfficiency(5, 8, 300, 0.075, 62.4)
This document describes the objectives, inputs, methods, and worksheet structure for an upgraded Excel (XLS) tool to perform Venturi scrubber design calculations. It’s written to be directly usable as documentation and as a blueprint for implementing or updating an Excel workbook with calculation sheets, input validation, and reporting output.
Key goals
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Several papers and calculation tools focus on the design of venturi scrubbers, often providing the fundamental equations for pressure drop and particle collection efficiency that are typical of Excel-based design templates. Key Design Resources and Papers
Venturi Scrubber Design Calculations (Scribd): This document serves as a direct reference for a venturi scrubber design .xls template. It includes input parameters like gas flow rate (e.g., 110,000 ACFM), temperature, and moisture content, and provides calculations for throat velocity, diameter, and section lengths.
Venturi Scrubber Performance Model (EPA): An authoritative report detailing simplified equations derived from Calvert's and Boll's models. It is ideal for programmers or engineers looking to build or verify their own Excel performance models.
Design and Analysis of Venturi Scrubber (JETIR): A research paper that walks through a step-by-step design case study, including psychrometric chart usage for gas humidification and saturated humidity calculations at high temperatures.
Venturi Scrubber Modelling and Optimization (ResearchGate): This paper focuses on the theoretical models for liquid injection and flux distribution, which are critical for optimizing the throat region where the majority of collection occurs. Core Calculation Parameters
If you are updating or creating an Excel tool, the following parameters from Scribd's design template are standard:
Gas Stream: Flow rate (ACFM), temperature, pressure, and moisture content. Throat Geometry: Velocity ( vthroatv sub t h r o a t end-sub ), diameter ( Dthroatcap D sub t h r o a t end-sub ), and length ( Lthroatcap L sub t h r o a t end-sub ). A common ratio for throat-to-diameter length is 3:1.
Liquid-to-Gas (L/G) Ratio: Typical values range around 20 gallons/1000 ACF for industrial applications. Performance Metrics: Pressure drop ( ΔPcap delta cap P
) and particle collection efficiency (often targeting >99%).
For peer-reviewed discussion on practical implementation, you can check threads on Cheresources, where engineers share and troubleshoot custom-made scrubber performance spreadsheets. Venturi Scrubber Design Calculations | PDF | Gases - Scribd
Venturi scrubber design calculations typically involve estimating the pressure drop cap delta cap P collection efficiency throat dimensions
based on gas flow rates and particle characteristics. Excel-based design tools often integrate these core equations to automate sizing for industrial air pollution control. Core Design Calculations 1. Pressure Drop ( cap delta cap P
The pressure drop is a critical performance indicator, as it directly relates to the energy required to operate the scrubber. Hesketh Equation : Commonly used to estimate cap delta cap P (in Pascals):
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 : Throat velocity ( : Gas density ( cap A sub t : Throat area ( : Liquid-to-gas ratio ( Calvert’s Model
: A simplified version for quick estimation in inches of water column (w.c.):
cap delta cap P equals 5.4 cross 10 to the negative 4 power center dot v sub t h r o a t end-sub squared center dot open paren the fraction with numerator cap L and denominator cap G end-fraction close paren www.cheresources.com 2. Throat Sizing and Geometry
Proper sizing ensures the gas reaches the necessary velocity to atomize the liquid. Venturi Scrubber Design Calculations | PDF | Gases - Scribd
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 (
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?
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:
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:
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
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: venturi scrubber design calculation xls upd
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
Since you are looking for a solid essay regarding "venturi scrubber design calculation xls upd" (which implies the use of updated Excel spreadsheets for design calculations), the following essay explores the engineering significance, the methodology behind the calculations, and the transition from manual algorithms to modern spreadsheet-based tools.
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.
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.
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The spreadsheet’s Goal Seek adjusts throat velocity automatically.
Venturi scrubbers are high-energy air pollution control devices used to remove particulate matter and hazardous gases from industrial exhaust streams. Designing an effective system requires precise calculations to balance collection efficiency against the energy costs of pressure drop. Fundamentals of Venturi Scrubber Design
A Venturi scrubber consists of three main sections: a converging section, a throat, and a diverging section. The process gas accelerates in the converging section, reaches maximum velocity in the throat where it contacts the scrubbing liquid, and سپس decelerates in the diverging section to recover static pressure.
The core of the design process focuses on determining the throat velocity and the liquid-to-gas (L/G) ratio. High throat velocities increase the relative velocity between the gas and liquid droplets, which enhances particle collection through inertial impaction. However, this also significantly increases the pressure drop across the system. Key Calculation Parameters
To build an accurate design spreadsheet, several critical variables must be accounted for:
Gas Flow Rate (Q_g): Usually measured in Actual Cubic Feet per Minute (ACFM).
Gas Density and Viscosity: These vary with temperature and pressure and affect the Reynolds number.
Liquid Flow Rate (Q_l): The volume of scrubbing liquid injected.
Liquid-to-Gas Ratio (L/G): Typically expressed in gallons per 1,000 cubic feet of gas.
Throat Velocity (V_t): The speed of the gas at the narrowest point of the Venturi. Pressure Drop Equations The pressure drop ( ΔPcap delta cap P
) is the most important factor in determining the operating cost of the scrubber. The most common correlation used in design calculations is the Johnstone equation or the Calvert modification.
The Calvert equation for pressure drop is often expressed as: ΔPcap delta cap P is in inches of water column. Vtcap V sub t is throat velocity in feet per second. is in gallons per 1,000 ACFM. Collection Efficiency Calculation The collection efficiency ( For more complex calculations (like iterative solver for
) is calculated based on the particle size distribution of the dust. Since scrubbers are more efficient at capturing larger particles, designers use the "cut diameter" ( d50d sub 50 ) method. The d50d sub 50
represents the particle size that is collected with 50% efficiency. The correlation typically follows the formula: Stkcap S t k
is the Stokes number, a dimensionless parameter representing the ratio of the stopping distance of a particle to the characteristic dimension of the obstacle (the liquid droplet). Structuring the XLS Tool
A modern "upd" (updated) Excel tool for Venturi design should be structured into clear input and output modules:
Input Module: Enter gas temperature, pressure, moisture content, and particle size distribution.
Physical Properties: Use built-in lookup tables for gas density and viscosity based on the inputs.
Sizing Module: Calculate the required throat area based on a target velocity.
Performance Module: Link the L/G ratio to the pressure drop and calculate the resulting collection efficiency for each particle size fraction.
Fan Power Requirements: Calculate the brake horsepower (BHP) required for the system fan based on the calculated ΔPcap delta cap P and fan efficiency. Maintenance and Optimization
Even a perfectly designed Venturi scrubber requires regular monitoring. Key performance indicators (KPIs) to track in your spreadsheet include the pressure drop stability and the liquid nozzle pressure. An updated design tool should also account for "evaporative cooling" effects if the inlet gas is significantly hotter than the scrubbing liquid, as this affects the actual gas volume inside the throat.
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.
The updated correlation includes an entrainment check: Critical velocity for droplet carryover = 23 m/s, actual outlet velocity = 18 m/s → safe. You can then use these functions directly in