Chemical Process Design

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FURNACES and DIRECT FIRED HEATERS (boilers,reboilers, pyrolysis, reformers) Q = Absorbed duty from heat balance • Radiant section (q r =37.6 kW/m 2 heat flux) + Convection section (q c =12.5 kW/m 2 heat flux). Equal heat transmission (kW) A rad =0.5 x kW/q r ; A conv =0.5 x kW/q c • Basic configuration for furnaces is given by a process heater with a box or Aframe construction, carbon steel tubes, and a 500 psig design P. This includes complete field erection. • Direct fired heaters is given by a process heater with cylindrical construction, carbon steel tubes, and a 500 psig design. Guthrie MPF for Furnaces: MPF= Fm+Fp+Fd Design Type Fd Process Heater 1.00 Pyrolisis 1.10 Reformer 1.35 Vessel Pressure (psig) Up to 500 1000 1500 2000 2500 3000 Fp 0.00 0.10 0.15 0.25 0.40 0.60 Radiant Tube Material, Fm Carbon Steel 0.00 Chrome/Moly 0.35 Stainless Steel 0.75 Guthrie MPF for Direct Fired Heaters MPF: Fm + Fp + Fd Design Type Fd Cylindrical 1.00 Dowtherm 1.33 Vessel Pressure (psig) Up to 500 1000 1500 Fp 0.00 0.15 0.20 Radiant Tube Material, Fm Carbon Steel 0.00 Chrome/Moly 0.45 Stainless Steel 0.50 14
HEAT EXCHANGERS 15
Page 1 and 2: Chemical Process Design  Subj
Page 3 and 4: 1.- INTRODUCTION Process Alternativ
Page 5 and 6: Cost Estimation Method of Guthrie
Page 7 and 8: An example of Cost Estimation Equip
Page 9 and 10: SHORTCUTS for VESSEL SIZING (Flash
Page 11 and 12: SHORT CUT for REACTORS SIZING First
Page 13: Heat exchanger: Countercurrent, ste
Page 17 and 18: SHORT CUT for DISTILLATION COLUMS S
Page 19 and 20: DISTILLATION COLUMNS 19
Page 21 and 22: SHORT CUT for COMPRESSORS (or TURBI
Page 23 and 24: Centrifugal pumps selection guide.
Page 25 and 26: Guthrie Material and Pressure Facto
Page 27 and 28: 3.- COST ESTIMATION OF EQUIPMENT: B
Page 29 and 30: MF: Module Factor, affected by BC,

Chemical Process Design

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