0

Full Content is available to subscribers

Subscribe/Learn More  >

Analysis of Fired-Heater Fouling in a Refinery Coking Unit

[+] Author Affiliations
Omar Barkat, Richard J. Nyberg, Jr.

McNeese State University, Lake Charles, LA

Paper No. HT-FED2004-56166, pp. 63-67; 5 pages
doi:10.1115/HT-FED2004-56166
From:
  • ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
  • Volume 3
  • Charlotte, North Carolina, USA, July 11–15, 2004
  • Conference Sponsors: Heat Transfer Division and Fluids Engineering Division
  • ISBN: 0-7918-4692-X | eISBN: 0-7918-3740-8
  • Copyright © 2004 by ASME

abstract

Delayed Coking is a principal thermal cracking process utilized by petroleum refineries to decrease residual output. Fired heater performance is critical to coker unit profitability. Adversely affecting heater performance, coke deposits inside heater tubes must be removed periodically (decoked). There are three main methods of decoking fired heaters: online spalling, steam-air decoke, and pigging. For each decoking technique, the most widely-used procedures are described. Also, the merits and drawbacks of each method are discussed. A survey of industry decoking practice has been attempted as part of this study. Fire-side tube metal temperature (TMT) and heater inlet pressure (PIN ) are the critical parameters used to analyze heater tube fouling. However, changes in flow rate, density, process temperature, and steam injection can cause a pass to have higher TMT or PIN than one with greater fouling. This study suggests approximation of coke deposit thickness to obtain a parameter normalized against changes in process variables. When used in conjunction with TMT and PIN , such a parameter can help in evaluating decoke effectiveness and identify the pass with least economically efficient operation. Economic analysis of fired-heater fouling considers direct costs and opportunity costs. Direct costs, such as plant utilities, fuel, in-house manpower, and outside contractor expense are assessed for each decoking method. This study also evaluates opportunity costs associated with reduction of throughput during decoking procedures. An example economic case is presented to illustrate the potential benefit of using estimated coke deposit thickness to schedule decokes.

Copyright © 2004 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In