Shell-side nozzle pressure drop

Toluene exit temperature = 257.4°F Styrene exit temperature = 175.9°F Tube-side tube pressure drop = 3.59 psi Tube-side nozzle pressure drop = 0.56 psi Toluene exit pressure = 85.85 psia Shell-side baffled pressure drop = 4.57 psia Shell-side nozzle pressure drop = 4.92 psia Styrene exit pressure = 40.52 psia Heat transfer area (tube outside) = 3,217 ft ... 

For short exchangers with no shell-side haffles, pressure drop is usually negligible. Allowances should he made for nozzle entrances and exits if the pressure level of the system warrants this detail. 

Calculate the pre.s.sure drop acro.ss the. shell side (excluding nozzles). Units for pressure drop are Ibf/ft. ... 

Note that the liquid inlet must be inline at bottom, and the vapor out must be inline at top (Figure 10-105). For a side oudet vapor nozzle, increase the heat transfer area by 30%. b. Horizontal or vertical shell-side boiling, size for low velocities and pressure drops. 

Should the liquid level in the bottom of the tower rise to the reboiler vapor return nozzle, the tower will certainly flood, but the reboiler heat duty will continue. Unfortunately, reboiler shell-side fouling may also lead to tray flooding. This happens because the fouling can cause a pressure-drop buildup on the shell side of the reboiler. 

Disc and donut type—this design has inner tubes placed in baffles which are alternately shaped as disc and donut. The orientation of gas inlet and exit nozzles does not affect the gas distribution as a result (no idle pockets are possible). The pressure drop on both tube and the shell side is lower, thus saving on power consumption by the blower. 

X shell is a cross flow shell. It does not have baffles. Shell side fluid flows across tube bundle to the other tdde of the shell. Pressure drop is low. For long tubes, more than one set of inlet/outlet nozzles will be used. Sometinies, perforated plates are used to help distribute the shell side flow across the tube bundle. It is mainly used for low pressure gas condensing service. [2]... 

FIG. H-21 Suction-type heater, normally installed in tank side nozzle to heat up relatively larger flows of viscous materials using steam, hot water, or other heating fluid in the tubes. These heaters normally have low shell side pressure drops to minimize npsh problems on pumps. For very high viscosity fluids, consult the manufacturer for methods of reducing intake viscosity. An Internal shutoff valve can be used to allow easy bunde removal. Main uses of this type heater Include bunker C, fuel oils, asphalt, molasses, caustic, etc. (Source Armstrong Engineering Associates.)... 

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