February 2010

Heat Transfer

Calculating turbulent diffusion jet flames

Following these steps may prevent potential damaging hot spots

Meagher, J.P., Praxair, Inc.

To estimate the impact of new operating conditions on processes and equipment under supervision, most engineers maintain a file of shortcut equations and spreadsheets to model equipment including heat exchangers, compressors and reactors. Unfortunately, one area that is often handled superficially with a rule-of-thumb or simple ratio is the flame profile estimation within fired heaters. The problem with these methods is that accuracy decreases with the separation from the base-case conditions. This can lead to missing important heat transfer effects and material limits within the fired heater. This usually results in destructive hot spots on the heater tubes or refractory walls. To address t

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