You have an element and an igniter?
I didnt know such a thing exsisted, not saying it doenst, I learn new stuff every day.
I do know one thing, and electric element, no matter what its on shouldnt "ignite".
Those dryer elements really need to be in their cavity with adaquate air passing through them when it is energized. If not in can overheat, and yes even catch on fire. (this I know through personal expirence

)
I will say, that IF you are looking at just an electric element with that kind of problem, it sounds like there isnt enough air passing trhough it. You might try cleaning out your exaust line, and under the drum where the blower is at, lots of lint gets trapped down there.