Firing into a industrial boiler

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The discussion centers on heat transfer efficiency in a water tube boiler furnace, specifically comparing the heat from the flame entering the boiler versus the combustion gases from an external combustion chamber. It is noted that the flame itself is merely the light emitted by the combustion gases, which suggests that the combustion gases may play a more significant role in heat transfer. Participants are encouraged to provide feedback or suggest alternative resources for further exploration of the topic. The inquiry seeks to clarify which method of heat transfer is more effective in this context. Overall, understanding these dynamics is crucial for optimizing boiler performance.
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Which transfers more heat inside a water tube boiler furnace. The flame entering the boiler, or the combustion gases generated by the flame from a combustion chamber located outside the boiler?

Assume the flame is not impinging any water tube.

Would appreciate any and all feedback…with a brief explanation. Or perhaps you know of a better website where this question could be posted...or reference manual?

Thank you.
 
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The "flame" is just the light caused by the combustion gases.
 
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