Scrubber Design Calculation Excel Hot Exclusive ◎

cap Q sub s a t end-sub equals cap Q sub i n end-sub center dot open paren the fraction with numerator cap T sub s a t end-sub and denominator cap T sub i n end-sub end-fraction close paren center dot open paren the fraction with numerator cap P sub i n end-sub and denominator cap P sub s a t end-sub end-fraction close paren (Corrected for moisture addition). Column Diameter Sizing Determine the column diameter based on superficial gas velocity ). For most vertical scrubbers, is kept between to avoid flooding while maintaining contact time. Calculation: Mass Transfer & Packing Height Calculate the Height of a Transfer Unit (HTU) Height Equivalent to a Theoretical Plate (HETP) . For hot acid gases (like cap H cap C l

) to determine the cooling load or potential for heat recovery. www.mchip.net Excel Implementation Resources

| Parameter | Input | Formula | Result | | --- | --- | --- | --- | | Gas Flow Rate (Q) | 10,000 | | 10,000 | | Velocity | 5 | | 5 | | Scrubber Diameter (D) | | =SQRT(4 10000/(PI() 5)) | 2.26 | | Scrubbing Liquid Flow Rate | 5000 | | 5000 | | L/G Ratio | 0.5 | | 0.5 | | Scrubber Height (H) | | =( scrubber volume /(PI() (2.26/2)^2)) | 5.12 | | Pressure Drop (ΔP) | | =(0.5 5* 1.2)/(2*9.81) | 0.153 |

Because hot gas calculations rely heavily on the vapor pressure of water at various temperatures, you can insert this standard VBA function into your Excel workbook to automate the process: scrubber design calculation excel hot

Calculated using the Souders-Brown equation or flooding correlation (e.g., Generalized Pressure Drop Correlation - GPDC). Flooding Velocity ( Vfcap V sub f

): Calculate the energy needed to pull gas through the scrubber. = (Q_sat * Delta_P) / (3600 * Fan_Efficiency) (where Delta_P is in Pascals and Flow is in 4. Key Design Considerations for Your Sheet

Your Excel workbook should be divided into sequential tabs or calculation blocks to mirror the physical process. Step 1: Inlet Gas Properties & Quench Calculations cap Q sub s a t end-sub equals

High evaporation rates mean substantial make-up water is required. 2. Key Design Parameters for the Excel Calculator

To prevent flooding (where upward gas velocity prevents downward liquid flow), you must calculate the critical column diameter using the correlation or the generalized pressure drop correlation (GPDC). Step 1: Calculate the Flow Parameter ( Flvcap F sub l v end-sub

) depends on the difficulty of the separation and the efficiency of the packing material. It is calculated using the Number of Transfer Units (NTU) and the Height of a Transfer Unit (HTU): Z=NTU×HTUcap Z equals NTU cross HTU Calculation: Mass Transfer & Packing Height Calculate the

A=QsatVgcap A equals the fraction with numerator cap Q sub s a t end-sub and denominator cap V sub g end-fraction

Standard pressure drop correlations (e.g., Calvert or Semrau) were developed for ambient air. Hot gas has lower density and higher viscosity.

The "cold" calculator would cause a gas velocity that is too high, massive re-entrainment, and pressure drop spikes. Your "hot" Excel sheet prevents this failure.