Mobflame never deletes itself

Using /particle with mobflame_emitter. I thought it would delete itself after a set amount of time like all other particles, but this one doesn't. It will linger infinitely.

I don't know why it never deletes, but I suspect it might be that it does not have a corresponding mob that it is attached to, so it is never being told to delete- but I haven't read the particle documentation.

 

I didn't know this would happen, so I used it with a repeating command block to keep a perpetual flame. Now I have about 100 of these particle emitters which cannot be deleted. They cannot be deleted with kill as they are not entities. How can I delete these?