Reference no: EM13945616
Ammonia vapor, 4500kg/h at 6.7 bara pressure, is to be cooled from 120oC to 40oC, using cooling water. The maximum supply temperature of the cooling water available is 30oC, and the outlet temperate is to be restricted to 40oC. The pressure drops over the exchanger must not exceed 0.5 bar for the ammonia stream and 1.5 bar for the cooling water.
A contractor has proposed using a shell and tube exchanger with the following specification for this duty:
Shell: E-type, inside diameter 590mm
Baffiles: 25% out, 300 mm spacing
Tubes: Carbon steel, 15 mm inside diameter, 19 mm outside diameter, 2400 mm long, number 360.
Tube arrangement: eight passes, triangular tube pitch, pitch 23.75 mm
Nozzles: shell 150 mm inside diameter, tube headers 75 mm inside diameter.
It is proposed to put the cooling water though the tubes.
Is the proposed design suitable for the duty?
Physical properties of ammonia at the mean temperature of 80oC: specific heat 2.418 kJkg-1oC-1, thermal conductivity 0.0317 W/moC, density 4.03 kg/m3, viscosity 1.21 * 10-5 Nm -2s.
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Proposed design suitable for the duty
: Ammonia vapor, 4500kg/h at 6.7 bara pressure, is to be cooled from 120oC to 40oC, using cooling water. The maximum supply temperature of the cooling water available is 30oC, and the outlet temperate is to be restricted to 40oC. The pressure drops ove..
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