Create one worksheet for efficiency calculations across a range of particle sizes. Use Excel’s array formulas or a small VBA macro to handle the iterative nature of the equations.
d0=585vtσρl+597(μlσ⋅ρl)0.45(1000⋅QlQg)1.5d sub 0 equals the fraction with numerator 585 and denominator 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 center dot the fraction with numerator cap Q sub l and denominator cap Q sub g end-fraction close paren to the 1.5 power is in microns ( ), and velocities/properties are in metric units.
The volumetric flow rate of the gas at actual stack conditions ( Qgcap Q sub g ) and the cross-sectional area of the throat ( Atcap A sub t ) determine the throat velocity:
To test your constructed Excel calculations, validate them against this standard industrial verification case: Gas Temperature: 80∘C80 raised to the composed with power C Liquid-to-Gas Ratio ( ): Target Velocity ( ): Expected Outputs in Excel: Required Throat Area ( Atcap A sub t ): Estimated Pressure Drop ( ΔPcap delta cap P ): (depending on the exact friction factor applied) Collection Efficiency for particles: venturi scrubber design calculation xls upd
Pressure drop dictates the operating fan horsepower. The or Yung et al. models are industry standards. A widely used empirical formula for pressure drop is:
A robust Excel calculation sheet does not merely perform arithmetic;
(recommended for its simplicity and broad acceptance): Create one worksheet for efficiency calculations across a
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. Efficiency depends on the Inertial Impaction Parameter ( ) :
This is where you specify known parameters. For easier use, add unit conversions to standard units (e.g., from ft³/min to m³/s). This sheet should include:
Beware of outdated free downloads (pre-2015). Recommended sources: The volumetric flow rate of the gas at
) 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
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.
ratio affect the operating costs (Fan HP) versus efficiency. 6. Maintenance and Scalability Calculations should include a Scrubbing Liquor Saturation
Using the Hesketh equation (make absolutely sure velocity is in ):
For a circular throat, the diameter is: