Venturi Scrubber Design Calculation Xls Upd !new!

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

Designing a venturi scrubber requires a precise balance of gas velocity, liquid-to-gas (L/G) ratios, and pressure drop calculations to ensure the effective removal of sub-micron particulate matter and gaseous contaminants.

Engineers often rely on updated XLS (Excel) templates to streamline these complex iterative designs, which typically follow a structured sequence from airstream characterization to mechanical sizing. Key Design Parameters and Equations A robust design calculation focuses on three primary areas:

Gas Velocity in the Throat: This is the most critical variable. High-efficiency removal of small particles (0.1 to 300 μm) usually requires throat velocities ranging from 60 to 120 m/s (197–394 ft/s). Pressure Drop ( ΔPcap delta cap P

): The pressure drop determines both the collection efficiency and the operational energy cost. It is frequently calculated using the Calvert equation:

ΔP=0.002⋅v2⋅LGcap delta cap P equals 0.002 center dot v squared center dot the fraction with numerator cap L and denominator cap G end-fraction is gas velocity and is the liquid-to-gas ratio.

Collection Efficiency: Efficiency is often modeled using the Yong-Howard correlation, which considers the "impaction parameter" of dust particles into the atomized liquid droplets. Core Calculation Steps for XLS Templates

A standard updated design spreadsheet typically includes the following modules:

Airstream Properties: Input sections for gas flow rate (ACFM), temperature, pressure, and specific contaminant load.

Saturation Adjustments: Calculation of the "saturated outlet volume" using correction factors to size the actual scrubber shell.

L/G Ratio Selection: Most venturi systems operate between 7 to 20 gallons per 1,000 cubic feet of gas.

Throat Sizing: Determining the cross-sectional area of the throat based on the selected gas velocity to ensure the liquid is properly atomized. venturi scrubber design calculation xls upd

Separator Sizing: Calculating the diameter of the cyclonic or mist eliminator section to prevent liquid carryover after the gas exits the venturi throat. Advanced Features in "UPD" (Updated) Tools

Modern XLS design tools often include "lookup" tables for material compatibility—ensuring the metals or plastics chosen can withstand high temperatures and corrosive gases like SO2cap S cap O sub 2 I2cap I sub 2

. They also automate the Blower Capacity Calculation, ensuring the system can overcome the calculated pressure drop to maintain required air exchanges per hour.

Professional resources like GlobalSpec provide detailed guides on scrubber selection, while technical documentation from Sly Inc. offers practical application factors for sizing wet scrubbers in industrial environments. SO2cap S cap O sub 2

) or a particular industrial application to refine these calculations?

Venturi Scrubber Design Guide | Sizing, Equations & Optimization

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

= 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? To design an effective Venturi scrubber calculation in

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 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. Relationships & Social Life

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 (

) 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.

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.

Relationships & Social Life

• Arranged vs love marriage realities
• Neighbor culture (sharing food, borrowing things)
• Wedding season craziness (budget, rituals, guest lists)
• Friendship dynamics in small towns vs metros

Step 3: Optimize L/G ratio

Run the Sensitivity Analysis table (built-in Excel Data Table). The XLS plots efficiency vs. ΔP, revealing the economic optimum at L/G = 0.8 L/m³ (pressure drop = 45 inches WC).

Introduction

In the world of industrial air pollution control, the Venturi scrubber remains one of the most efficient devices for removing particulate matter (PM) from high-temperature, corrosive, or sticky gas streams. Unlike baghouses or electrostatic precipitators, Venturi scrubbers handle variable loads and sticky particles with relative ease. However, their efficiency hinges on one critical factor: precision in design engineering.

For decades, engineers have relied on manual calculations, nomographs, and basic spreadsheets. But with tighter environmental regulations (e.g., EPA MACT standards, EU BREF documents) and the need for energy optimization, the demand for an updated Venturi scrubber design calculation XLS has skyrocketed. This article provides a deep dive into the core calculations, the latest updates in modeling approaches, and how to leverage modern spreadsheets to design high-performance systems.

6. Recommended Update Path for Your Spreadsheet

If you are updating your own XLS:

1. Replace static equations with:

   =IF(throat_velocity > 150, "Warning: high velocity", pressure_drop_calc)
   

2. Add NIST steam table lookup for saturation temperature.
3. Include particle penetration for 0.1–10 µm (use log-normal distribution).
4. Add design margin (10–20% on gas flow).
5. Link throat ΔP to fan power – P_fan = (Q_g * ΔP) / fan_eff.

Part 2: Core Theory Behind Venturi Scrubber Calculations

Before diving into the spreadsheet layout, revisit the three governing zones:

1. Converging section – Gas accelerates, liquid is injected.
2. Throat – Maximum relative velocity between gas and liquid droplets; particle collection occurs via inertial impaction, interception, and diffusion.
3. Diverging section – Pressure recovery, deceleration, and droplet coalescence.

3. Typical Inputs / Outputs in an XLS Design Sheet

Inputs (user enters):

• Gas flow rate (actual m³/s)
• Inlet dust loading (g/m³)
• Particle size distribution (µm)
• Required outlet emission (mg/Nm³)
• Liquid (water) flow rate or L/G ratio
• Throat diameter (or velocity target)

Outputs (calculated):

• Pressure drop
• Collection efficiency (by particle size)
• Throat dimensions (length, diameter)
• Liquid requirements
• Power consumption (kW)
• Entrainment separator sizing (if included)

Tab 2: Throat Sizing (Iterative Solver)

• Uses Goal Seek or VBA macro to match ΔP and efficiency
• Calculates throat diameter, length-to-diameter ratio (typical 2:1 to 4:1)
• Updated feature: Includes velocity profile factor for rectangular throats (common in large steel mills)

Option 1: Build Your Own Venturi Scrubber Calculator in Excel

You can create a robust design tool by setting up an Excel sheet with the following columns and formulas.