Intensified Heat Transfer Technology – CFD Analysis to Explain How and Why IHT Increases Runlength in Commercial Furnaces

The 21st Ethylene Producers Conference
2010 AIChE Spring Meeting
AIChE Spring Meeting and Global Congress on Process Safety
March 23, 2010 - 8:00pm
Intensified Heat Transfer Technology (IHT) is the use of radiant coil inserts that have a twisted baffle integrated with their inner surface. The inserts have the same diameter and metallurgy as the radiant coil, and are placed strategically in the coil to create turbulence in the process fluid, thus reducing the boundary layer and increasing runlength by achieving improved heat transfer. Commercial experience in more than 50 heaters – most of them cracking naphtha – has shown that runlength can be extended by a factor of 1.2 to two times the runlength of a bare coil. The main advantage of the inserts, aside from their competitive cost, is that they can be installed into new or existing heater tubes. In this paper, data from units operating with IHT will be presented. We will discuss a computational fluid dynamics (CFD) analysis that was applied to a heater coil to explain the benefit of installing IHT. The velocity and temperature profiles in the coil with and without IHT were studied and the optimum location of the inserts was evaluated. A kinetic scheme was devised to estimate the coke rate formation at the tube surface, which ultimately explains the reduction in tube metal temperature (TMT) when using IHT.
Professional Development Hours
0.5 PDHs
You will be able to download and print a certificate for these PDH credits once the content has been viewed. If you have already viewed this content, please click here to login.

Would you like to access this content?

No problem. You just have to complete the following steps.

You have completed 0 of 2 steps.

  1. Log in

    You must be logged in to view this content. Log in now.

  2. Purchase Technical Presentation

    You must purchase this technical presentation using one of the options below.
    If you already purchased this content recently, please click here to refresh the system's record of ownerships.


Credits 0.5 Use credits
List Price $25.00 Buy now
AIChE Members $15.00 Buy now
AIChE Undergraduate Student Members Free Free access
AIChE Graduate Student Members $15.00 Buy now
Related Topics: