I like this spell, but:

Why is this spell an evocation? You are altering and changing the physical properties of things. That is transmutation.

Why personal emanation? So a caster can set fire to things that are next to him? I think this would be better as a area effect spell. And having a caster walking around all the time with this spell active would be too much.

The spell has no save and no spell resistance? Um, why not? If it effects creatures, they should get both.

Does this spell effect magic? Like spells? Does this spell alter the way spells work, changing fire protection into fire vulnerability? And magic items too?