Venturi Scrubber Design Calculation Xls Upd May 2026
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| Parameter | Formula | Typical Range / Notes | |-----------|---------|------------------------| | Throat velocity ( v_t = \fracQ_gA_t ) | ( Q_g ) = gas flow rate (m³/s), ( A_t ) = throat area (m²) | 50–150 m/s | | Pressure drop (Calvert model) | ( \Delta P = 1.03 \times 10^-3 \cdot v_t^2 \cdot \fracLG ) (SI units) | 5–150 kPa (20–600 in H₂O) | | Liquid-to-gas ratio (L/G) | ( \fracLG = \fracQ_lQ_g ) (L/m³ or gal/1000 ft³) | 0.5–5 L/m³ typical | | Collection efficiency (for particle dia (d_p)) | ( \eta = 1 - \exp\left( - \fracK \cdot L/G \cdot v_td_p \cdot \Delta P \right) ) (simplified) | 95–99% for >1 µm | | Throat length | ( L_t = 3 \cdot d_t ) (common rule of thumb) | 0.2–1 m |
Many Excel tools use Johnstone’s or Calvert’s model for efficiency and pressure drop.
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
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 venturi scrubber design calculation xls upd
) 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
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 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 ( ): | Parameter | Formula | Typical Range /
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
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) Many Excel tools use Johnstone’s or Calvert’s model
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?
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.
You can paste these Excel formulas into your spreadsheet cells (assuming you name your input cells accordingly).
A. Throat Velocity ($V_t$) Venturi scrubbers typically operate at throat velocities between 15,000 to 24,000 ft/min (75 to 120 m/s).
B. Pressure Drop ($\Delta P$) The most common equation is the Calvert Equation: $$ \Delta P = \fracV_t^2 \times L5050 \times 10^-3 $$ (Where $V_t$ is throat velocity in ft/sec and $L$ is Liquid-to-Gas ratio in gal/1000 ft³).
C. Particle Collection Efficiency The cut-power theory is often used. The collection efficiency for a specific particle size ($d_p$) can be estimated using the dimensionless parameter $\sqrt\lambda$.
$$ \eta = 1 - \exp(-\frac4.6 \times LG \times \frac\rho_L\rho_g \times (\fracd_pd_50)^2) $$
D. Liquid-to-Gas Ratio (L/G) This is a critical design parameter.
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.
A professional spreadsheet is organized into the following 7 tabs:
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).