[ L/G = \fracQ_lQ_g ]
Packed columns offer higher mass transfer efficiency due to the large interfacial area provided by packing materials (random or structured). The (available on Cheresources.com) provides preliminary designs for packed column scrubbers.
Line up the equations sequentially matching the engineering steps outlined above:
, you must calculate the volumetric flow rate of the gas at this lower temperature to size the vessel correctly:
Excel remains the most accessible platform for developing custom engineering calculation tools. The following table summarizes widely available Excel resources for scrubber design: scrubber design calculation excel hot
D=4Aπcap D equals the square root of the fraction with numerator 4 cap A and denominator pi end-fraction end-root Step 3: Calculate Height of Packing (Mass Transfer) The height of the packed bed ( ) is calculated using the Number of Transfer Units ( NTUcap N cap T cap U ) and the Height of a Transfer Unit ( HTUcap H cap T cap U
A=Mass Flow Rate of GasGdesigncap A equals the fraction with numerator Mass Flow Rate of Gas and denominator cap G sub d e s i g n end-sub end-fraction
A robust scrubber design spreadsheet relies on . Below are key implementations for each design module.
Ln(ΔP) = a0 + a1*Ln(G) + a2*Ln(L) + a3*T + ... [ L/G = \fracQ_lQ_g ] Packed columns offer
The (available from GrowMechanical.com) is a comprehensive tool that “helps streamline the selection process, saving you hours of calculations and improving precision”.
Hot gas entering the scrubber evaporates a portion of the scrubbing liquid instantly. This cools the gas down to its adiabatic saturation temperature but dramatically increases the volumetric flow rate of the gas due to the addition of water vapor.
= (0.000585/vr) * SQRT(sigma/rho_l) + 0.0597 * (mu_l / SQRT(sigma/rho_l))^0.45 * (Ql/Qg)^1.5
Here's an example Excel template that you can use to perform scrubber design calculations: The (available from GrowMechanical
Calculate the water required to cool the gas.
), which must be safely below the column flooding limit (typically designed at of flooding velocity):
This comprehensive guide details the design engineering principles for hot gas wet scrubbers and provides a structured blueprint to build your own verification calculation sheet in . 1. Thermodynamic Fundamentals of Hot Gas Scrubbing