Hi everybody! =)
Here is my try:
There are three particle systems: one for the middle (hard to see right now), one for volume and one for small particles flying up. Basic additive particle shader. And no optimization =)
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Update:
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oh! these lines add so much magic to it! love it 
i wonder if a slight bend of the flame could add nice variation to it…like when wind is blowly softly and changes direction slowly.