scholarly journals Evaluation of Crude Oil Fouling Formation in a Heat Exchanger with Twisted Tape Inserts

2019 ◽  
Vol 37 (4) ◽  
pp. 927-935
Author(s):  
Mario Cucumo ◽  
Marilena Mele ◽  
Francesco Nicoletti ◽  
Antonio Galloro ◽  
Diego Perrone ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Crude Oil ◽  
Twisted Tape ◽  
Oil Fouling

Validation of a Novel Model for Shell and Tube Heat Exchangers Undergoing Crude Oil Fouling

2010 ◽  
Author(s):  
Francesco Coletti ◽  
Sandro Macchietto
Keyword(s):  
Heat Exchanger ◽  
Crude Oil ◽  
Operating Conditions ◽  
Process Conditions ◽  
Model Parameters ◽  
Fluid Temperature ◽  
Oil Companies ◽  
Wide Range ◽  
Shell And Tube ◽  
Oil Fouling

Fouling in refinery heat transfer units is a major problem that affects plant’s economics, operability, safety and environmental impact. Traditional heat exchanger design methodologies based on fixed values for the fouling resistance (e.g. TEMA fouling factors) have drawn several critiques in the past 40 years and were found responsible for exacerbating fouling rather than mitigating it. The fouling factors approach is, in fact, highly empirical and neglects fouling dynamics and its dependency on process conditions. The ability of capturing such dependency is therefore pivotal to overcome traditional design limitations. A novel dynamic, distributed model for a multi–pass shell–and–tube heat exchanger undergoing crude oil fouling was recently proposed by Coletti and Macchietto. The model takes into account the exchanger geometry and configuration, the variation of fluid temperature, velocity, physical properties and fouling rate along the length of each unit and captures the interactions between the fouling layer growth and the fluid–dynamics by solving a moving boundary problem. In this paper, the model is validated over a wide range of operating conditions (i.e. temperatures and flowrates) with data from four different industrial units (2 single and 2 double shells). Geometries and process conditions used are those of two refineries belonging to major oil companies (ExxonMobil and Shell). Some model parameters are estimated for each exchanger using measurements during the first 60 days after a mechanical cleaning. The model is then used in a fully predictive mode for subsequent times. Results indicate that for all units the outlet temperatures (in °C) are predicted over extended periods (i.e. 4–16 months) with an excellent accuracy of ±1% for the tube-side and ±2% for the shell-side. It is concluded that the model can be used with confidence on a wide range of operating conditions to calculate reliable temperatures and fouling resistances.

Use of crude oil fouling threshold data in heat exchanger design

2002 ◽  
Vol 22 (7) ◽  
pp. 763-776 ◽  
Author(s):  
G.T. Polley ◽  
D.I. Wilson ◽  
B.L. Yeap ◽  
S.J. Pugh
Keyword(s):  
Heat Exchanger ◽  
Crude Oil ◽  
Heat Exchanger Design ◽  
Threshold Data ◽  
Oil Fouling

scholarly journals Thermal Fluid Dynamics Analysis of Crude Oil Fouling in a Heat Exchanger with Internal Mechanical Inserts

2019 ◽  
Vol 63 (2-4) ◽  
pp. 151-157
Author(s):  
Mario Cucumo ◽  
Antonio Galloro ◽  
Nicoletta Greco ◽  
Marilena Mele ◽  
Francesco Nicoletti ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Heat Exchanger ◽  
Crude Oil ◽  
Dynamics Analysis ◽  
Oil Fouling

scholarly journals Effect of Shear Stress on Crude Oil Fouling in a Heat Exchanger Tube Through CFD Simulations

2016 ◽  
Vol 148 ◽  
pp. 1058-1065 ◽  
Author(s):  
Sampath Emani ◽  
M. Ramasamy ◽  
Ku Zilati Bt. Ku Shaari
Keyword(s):  
Shear Stress ◽  
Heat Exchanger ◽  
Crude Oil ◽  
Heat Exchanger Tube ◽  
Cfd Simulations ◽  
Oil Fouling ◽  
Exchanger Tube

scholarly journals Investigation of Overlapped Twisted Tapes Inserted in a Double-Pipe Heat Exchanger Using Two-Phase Nanofluid

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1656 ◽  
Author(s):  
Mehdi Ghalambaz ◽  
Hossein Arasteh ◽  
Ramin Mashayekhi ◽  
Amir Keshmiri ◽  
Pouyan Talebizadehsardari ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Performance Evaluation ◽  
Heat Exchanger ◽  
Evaluation Criterion ◽  
Twisted Tape ◽  
Performance Evaluation Criterion ◽  
Twisted Tapes ◽  
Double Pipe ◽  
Pipe Heat

This study investigated the laminar convective heat transfer and fluid flow of Al2O3 nanofluid in a counter flow double-pipe heat exchanger equipped with overlapped twisted tape inserts in both inner and outer tubes. Two models of the same (co-swirling twisted tapes) and opposite (counter-swirling twisted tapes) angular directions for the stationary twisted tapes were considered. The computational fluid dynamic simulations were conducted through varying the design parameters, including the angular direction of twisted tape inserts, nanofluid volume concentration, and Reynolds number. It was found that inserting the overlapped twisted tapes in the heat exchanger significantly increases the thermal performance as well as the friction factor compared with the plain heat exchanger. The results indicate that models of co-swirling twisted tapes and counter-swirling twisted tapes increase the average Nusselt number by almost 35.2–66.2% and 42.1–68.7% over the Reynolds number ranging 250–1000, respectively. To assess the interplay between heat transfer enhancement and pressure loss penalty, the dimensionless number of performance evaluation criterion was calculated for all the captured configurations. Ultimately, the highest value of performance evaluation criterion is equal to 1.40 and 1.26 at inner and outer tubes at the Reynolds number of 1000 and the volume fraction of 3% in the case of counter-swirling twisted tapes model.

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