0

Full Content is available to subscribers

Subscribe/Learn More  >

Simulation of Combustion and Thermal-Flow Inside a Petroleum Coke Rotary Calcining Kiln: Part 2—Analysis of Effects of Tertiary Airflow and Rotation

[+] Author Affiliations
Zexuan Zhang, Ting Wang

University of New Orleans, New Orleans, LA

Paper No. IMECE2009-13252, pp. 211-223; 13 pages
doi:10.1115/IMECE2009-13252
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 3: Combustion Science and Engineering
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4376-5 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

A computational model is established to simulate the combustion and thermal-flow behavior inside a petcoke rotary calcining kiln. The results show that peak temperature is located at the tertiary air zone and a cold region that exists between the natural gas combustion zone and the tertiary air zone causes the coke bed to lose heat to the gas stream. The cold tertiary air injections reduce the gas temperature inside the kiln, so preheating the tertiary air using extracted gas or other waste energy is essential to saving energy. The devolatilization rate and location have a pronounced effect on the simulated temperature distribution. As the calcining kiln rotates, the tertiary air injection nozzles will move relative to the coke bed and exert cyclic air-bed interactions. At zero angular position, the air injection nozzles are diametrically located away from the bed, so the interactions between the tertiary air jets and coke bed are minimal. As the kiln rotates to a 180-degree position, the stem of the air injection nozzles are actually buried inside the coke bed with the nozzles protruding outward from the bed. At this position, the tertiary air jets will provide a fresh layer of air just above the coke bed, and the interaction between the air flow and coke bed becomes strong. The 45° rotational angle case shows a better calcination with a 100 K higher bed surface temperature at the discharge end compared to the rest of rotational angles. Without including the coke fines combustion and the coke bed, the lumped gas temperature for the rotational cases shows a peak temperature of 1,400 K at Z/D = 2, which is due to natural gas combustion; the lowest temperature is around 1,075 K at two locations, Z/D = 4 and 8, respectively. The exhaust gas temperature is approximately 1,100K.

Copyright © 2009 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