A vaporizer is required to evaporate 10,000 kg/h of a process fluid, at 6 bar. The liquid is fed to the vaporizer at 20°C.

The plant has a spare kettle reboiler available with the following specification. U-tube bundle, 50 tubes, mean length 4.8 m, end to end. Carbon steel tubes, inside diameter 25 mm, outside diameter 30 mm, square pitch 45 mm.

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Steam at 1.7 bara will be used for heating. Check if this reboiler would be suitable for the duty specified. Only check the thermal design. You may take it that the shell will handle the vapor rate. Take the physical properties of the process fluid as liquid: density 535 kg/ m³, specific heat 2.6 kJkg-¹°C-1, thermal conductivity 0.094 Wm-¹°C-1, viscosity 0.12 mNm 2s, surface tension 0.85 N/m, heat of vaporization 322 kJ/kg. Vapor density 14.4 kg/m³. Vapor pressure: temperature C pressure bar 50 60 70 80 90 100 110 120 5.0 6.4 8.1 10.1 12.5 15.3 18.5 20.1