Che 451 chemical engineering design i HEAT EXCHANGER DESIGN

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Presentation transcript:

Che 451 chemical engineering design i HEAT EXCHANGER DESIGN Prof. Dr. Bekir Zühtü UYSAL Res. Asist. Melda ESKİTOROS 09114003 EMRE AKASLAN

index AIM PROPERTIES OF ETHYLENE GLYCOL AND WATER CHOSEN HEAT EXCHANGER TUBE PROPERTIES BAFFLES TUBE SIDE AND SHELL SIDE OPTIMUM TEMPERATURE RESULTS ECONOMIC RESULTS CHEMCAD RESULTS

AIM: THE AIM IS COOLING ETHYLENE GLYCOL 100 TO 50 OC FOR USING DEHIDRATION OF NATURAL GAS. SO A HEAT EXCHANGER DESIGNED FOR COOLING ETHYLENE GLYCOL.

Properties of ethylene glycol at 75 degrees Ethylene Glycol Properties at 75 Degrees Molecular Weight (g/mol) 62,07 Tin (Celcius) 100 Viscosity (kg/ms) 0,003448 Tout (Celcius) 50 Cp (kj/kgK) 2,6603 Density (kg/m3) 1073,6709 m (kg/s) 26 Prandtl Number 35,4295651 Thermal Conductivity (W/mK) 0,2589

Properties of water at 42 degrees Water Properties at 41 Degree Molecular Weight (g/mol) 18,02 Tin (Celcius) 30 Viscosity (kg/ms) 0,0007114 Tout (Celcius) 45 Cp (kj/kgK) 4,1797 Density (kg/m3) 992,8834 m (kg/s) Prandtl Number 4,775074 Thermal Conductivity (W/mK) 0,6227

Why shell and tube heat exchanger LARGE SURFACE AREA MECHANİCAL LAYOUT SHAPE FOR PRESSURE OPERATİON FABRİCATİON TECHNİQUES EASİLY CLEANED

Tube Material: Carbon Steel Tube properties Tube Properties Size 3/4'' OD (m) 0,01905 BWG 16 ID (m) 0,01575 Xw 0,00165 Length (m) 4,8768 Tube Material: Carbon Steel kw (W/mK) 45

TUBE PATTERNS SELECTED PATTERN

Baffles

Fluid Allocation SHEEL OR TUBE SIDE CORROSION FOULING FLUID TEMPERATURES OPERATING PRESSURES PRESSURE DROP VISCOSITY STREAM FLOW-RATES

Optimum temperature results Optimum Water Outlet Temperature: 51 oC Optimum Water Mass Flow Rate: 39,4 kg/s Optimum Heat Exchanger Area: 271,8 m2 Number of Actual Tubes: 745 Inside Fluid Film Coefficient: 1878,6 W/m2.oC Outside Fluid Film Coefficient: 816,7 W/m2.oC Overall Coefficient Based on the Outside Area of Tube, Assumed: 400 W/m2.oC Overall Coefficient Based on the Outside Area of Tube, Calculated: 425,5 W/m2.oC Heat Duty (Required): 3458,4 kW Heat Duty (Calculated): 3742,5 kW

Qcal/Qreq Ratio:1,08 (Acceptable) Pressure Drop at Tube Side: 0,73 kPa Power of Pump at Tube Side: 0,039 kW Pressure Drop at Shell Side: 4,8 kPa Power of Pump at Shell Side: 0,154 kW PEC for Heat Exchanger: 75666 TL Total Electric Cost: 464 TL/yr Water Cost: 33173 TL/yr Direct Cost: 108202 TL Indirect Cost: 31824 TL Fixed Capital Invesment: 140026 TL Total Annual Cost: 47732 TL/yr

Economic results

Chemcad calculations

CHEMCAD CALCULATIONS 26% ERROR 1.8% ERROR

THANKS FOR YOUR ATTENTION