1 reply to this topic

[premjagan]

 CASE 1: when X m3/hr of gas is passing through the catalyst bed,it offers the definite pressure drop.

 

 CASE 2 : when X+X1 m3/hr of gas is passing through the catalyst bed, the pressure drop offered by the same catalyst bed .is now varied surely.

 

                         when volumetric flow of gas through the catalyst is inscreased, how can i calculate the variation of pressure drop offered by the catalyst bed vessel?

 

Regards

 

PREMKUMAR

[Steve Hall]

The Ergun Equation is a way to predict the pressure drop. If you know the pressure drop at one set of conditions, the pressure drop varies by the square of flow (double the flow, quadruple the pressure drop) -- assuming density remains constant which means this is valid only when the pressure drop is less than about 10% of the inlet pressure. For rough work, the pressure drop can be larger - say 25% - of the inlet pressure (pressure is absolute, not gage).