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Study on Intensified Heat Transfer of Ethylene Cracking Furnace

Author: LiuFengHe
Tutor: ZhangWeiJiang；SongJiaBo
School: Tianjin University
Course: Chemical Engineering
Keywords: Distorted piece Cracker Ethylene Simulation Heat transfer enhancement
CLC: TQ221.211
Type: Master's thesis
Year: 2007
Downloads: 90
Quote: 0
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Abstract


The experimental study and simulation of heat transfer enhancement method for cracking tube segments joined the entire cast pipe with a distorted piece . Cold model experiment results show that : in the the distorted piece tube center area , high Reynolds number dimensionless velocity distribution is less than the values ??in the low Reynolds number , the axial velocity along the diameter distribution than the flat circular tube some ; near-wall region dimensionless velocity distribution at high Reynolds number higher than the values ??in the low Reynolds number , the velocity gradient than the large circular tube . Retrofitting distort the sheet tube tube voltage drop will increase , but vary along the direction of the pipe length relative to the entire tube length , the material pressure is uniform . Investigated naphtha cracking conditions , applications distorted tube cracking furnace wall temperature , waste heat furnace outlet temperature and ethylene yield , experimental results show that : after retrofitting distortions piece tube , Cracking Furnace tubes wall temperature (TMT) decreased by more than 20 ℃ , little change in the yield of the main products , waste heat from the furnace outlet temperature is low and flat trends . Divided grid-based method of generating the calculated area of the distorted piece tube , this simulation is the best distorted than the average drag coefficient and Reynolds number , the calculation results with the experimental results .

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic hydrocarbons > Unsaturated lipid hydrocarbon > Monoolefins > Ethylene
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