11147

10263

كارشناسي ارشد

پديده هاي انتقال

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي

1394

چهارده، 109ص.: مصور

محسن نصر اصفهاني

ارجمند مهرباني، احمد سوهانكار

1395/01/21

مهندسي شيمي

ID10263

Investigation of Reduce Fuel Consumption s Methods in Indirect Water Bath Heat Exchanger in City Gate Station Reza Mansouri Zadeh r mansouri@ce iut ac ir 13 January 2016 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor M Nasr Esfahany mnasr@cc iut ac irAbstractNatural gas pressure decreases in City Gate Stations CGS for industrial and residential use The moisturepresent in natural gas may result in hydrate formation in the pipelines Water bath heat exchanger is used toprevent hydrate formation by increasing the temperature of natural gas Energy consumption in heaters ofCGS is considerable and high quality refined gas is used for combustion in these heaters Because of greatamount of air or fuel entered into combustion chamber of the heaters as well as high temperature of stackeffluent these heaters usually work inefficiently and there is room for improving performance The aim ofthe present thesis was to save fuel consumption in heaters Computation fluid dynamic was used to analysethe heater making use of commercial software Fluent 15 Heat recovery from combustion exhausts byinstalling an economizer was studied Four economizers with two helical coils with a diameter of 25 4 mmand 50 8 mm and pitch 1 5 and 1 8 and four economizer with a single helical coil with a diameter of 50 8 mmand 101 6 mm and pitch 1 5 and 1 8 were examined The results showed that installing economizer with twohelical coils with a diameter of 50 8 mm and pitch 1 5 made the greatest saving in fuel consumption by10 Heat recovery from combustion exhausts by installing a recuperator was also studied Installing recuperatorreduces fuel consumption by 11 Improved performance of the heat exchanger with different finned tubeswere also investigated with corrugated fins with height to tube diameter ratio of 0 05 0 075 and 0 1 and theratio of blade pitch to height of 4 10 and 20 Finned tube with the ratio of height to tube diameter of 0 1 andthe ratio of pitch to the height of 4 showed the best performance by reducing fuel consumption by 3 3 Fluid in the tank transfers energy from fire tubes to coils via natural convection Addition Al2O3 nanoparticles to the fluid increased the transfer rate Addition of 1 vol Alumina to the fluid reduced the fuelconsumption by 3 It is proposed that both nano fluid addition and installing economizer or recuperator will be used to achievethe best performance Keywords City Gate Station Helical Coiled Heat Exchanger Finned Tube Nano Fluid NaturalConvection Heat Transfer Subcooled Boiling

محسن نصر اصفهاني

ارجمند مهرباني، احمد سوهانكار