1) 1.1) 1.2) Another relation for critical flux.

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Presentation transcript:

1)

1.1)

1.2)

Another relation for critical flux

1.3)

64

( ) 2)

Another commonly used type is Fired reboiler Fired heaters (furnaces) may be used as a distillation column reboiler. A pump is required to circulate the column bottoms through the heat transfer tubes in the furnace's convection and radiant sections

Approximate method for Thermosiphon preliminary design Obtain the physical properties of the boiling liquid (Boiling point, critical temperature, molecular weight, latent heat of vaporization) and the process fluid (saturation temperature). Calculate the mean overall ∆T= Tsat, steam - Tboiling Calculate the reduced temperature Tr= T/Tc Estimate the design heat flux from Figure 12.61 Calculate the heat load Q=m x hfg Calculate the area A= Q/heat flux

Thermosiphon design continued……… Assume id, od, and length for the tubes Calculate the area for one tube (A1) and the number of tubes N=A/A1 Assume a pitch configuration and get n, K1 from the table. Calculate the bundle diameter, shell clearance and shell diameter. The output diameter = SQRT(N*Across*4/Pi]

Example