Vt=QgasAthroatcap V sub t equals the fraction with numerator cap Q sub g a s end-sub and denominator cap A sub t h r o a t end-sub end-fraction (Where Qgascap Q sub g a s end-sub is the volumetric flow rate and Athroatcap A sub t h r o a t end-sub is the throat area). Pressure Drop (
Legacy spreadsheets often overpredict efficiency by 5–10%. The updated version includes correction factors derived from 100+ CFD simulations (ANSYS Fluent) for:
Collection efficiency is calculated using the :
Required Fan Power (kW)=Qg⋅ΔPηfan⋅102Required Fan Power (kW) equals the fraction with numerator cap Q sub g center dot cap delta cap P and denominator eta sub fan end-sub center dot 102 end-fraction For a standard system moving of process gas with a calculated pressure drop of fan efficiency, the primary motive fan will draw of electrical power.
ΔP=vt2⋅ρg⋅At0.133507⋅(QlQg)0.78cap delta cap P equals the fraction with numerator v sub t squared center dot rho sub g center dot cap A sub t to the 0.133 power and denominator 507 end-fraction center dot open paren the fraction with numerator cap Q sub l and denominator cap Q sub g end-fraction close paren to the 0.78 power venturi scrubber design calculation xls upd
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.
High relative velocity between the dust particles and the liquid droplets drives inertial impaction. This traps the particles inside the droplets. The stream then enters a diverging section (diffuser) to recover static pressure before a cyclonic separator isolates the dirty liquid from the clean gas.
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Increasing velocity increases the impaction parameter ( Vt=QgasAthroatcap V sub t equals the fraction with
A Venturi scrubber consists of three distinct geometric sections:
| Mistake | Consequence | Solution in XLS | |--------|------------|----------------| | Using water properties for caustic scrubbing | Underestimates droplet size | Dropdown selector with liquid library (20+ fluids) | | Ignoring gas temperature drop (adiabatic saturation) | Overestimates gas density | Integrated psychrometric calculator | | Neglecting pressure recovery in diverging section | Oversized fan | Separate ΔP recovery factor (0.6–0.75) | | Using average velocity instead of throat peak velocity | Undersized throat | User warning if velocity uniformity <0.85 |
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:
ΔP=5.0×10-5⋅vt2⋅ρg⋅(LG)cap delta cap P equals 5.0 cross 10 to the negative 5 power center dot v sub t squared center dot rho sub g center dot open paren the fraction with numerator cap L and denominator cap G end-fraction close paren = Pressure drop ( cm of water columncm of water column = Throat gas velocity ( ρgrho sub g = Gas density ( kg/m3kg/m cubed = Liquid-to-gas ratio ( L/m3L/m cubed ΔP=vt2⋅ρg⋅At0
The following parameters are essential for a complete venturi scrubber design: Flow rate (ACFM), temperature ( ∘Fraised to the composed with power F ∘Craised to the composed with power C ), and moisture content (% v/v).
). Total efficiency is determined by integrating the size-specific penetration across the inlet particle size distribution curve. Excel Spreadsheet ( .xls ) Architecture Guide
: Determining the cross-sectional area of the throat based on the selected gas velocity to ensure the liquid is properly atomized.
You can paste these Excel formulas into your spreadsheet cells (assuming you name your input cells accordingly).
ψ=C⋅ρp⋅dp2⋅vt9⋅μg⋅ddpsi equals the fraction with numerator cap C center dot rho sub p center dot d sub p squared center dot v sub t and denominator 9 center dot mu sub g center dot d sub d end-fraction = Cunningham slip correction factor ρprho sub p = Particle density ( kg/m3kg/m cubed = Particle diameter ( μgmu sub g = Gas viscosity ( = Sauter mean droplet diameter ( ), calculated via Nukiyama and Tanasawa equation:
The primary mechanism of particulate collection is . Because the gas accelerates rapidly in the throat while the heavier liquid droplets accelerate more slowly, a high relative velocity difference occurs. Dust particles carried by the gas stream impact and become trapped within the liquid droplets. Step-by-Step Design Calculation Methodology